Solar powered fluid heating system

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pressurizing apparatus is preferably driven by solar

SOLAR POWERED FLUID HEATING SYSTEM energy, either by means of a plurality of photovoltaic cells or by means of a generator driven by a turbine

TECHNICAL FIELD which is in turn driven by vaporized refrigerant flowing This invention relates generally to solar powered 5 through the vapor conduit from the separator to the fluid heating systems, and more particularly to a solar condenser. Wind energy may also be used to provide powered system for heating water. operating power for the refrigerant pressurizing appara tus, either alone or in combination with a solar powered

BACKGROUND AND SUMMARY OF THE energy source.

INVENTION 10 In accordance with more specific aspects of the in The use of sunlight as a heat source is an obvious way vention, the refrigerant pressurizing apparatus may to reduce dependency on energy sources such as gas, comprise a pump which receives liquid refrigerant from oil, coal, etc. The solar heating of water is particularly the condenser and which directs pressurized liquid re attractive because energy available at one time may be frigerant through a portion of the liquid conduit to the stored for use at a later time. Because energy storage is 15 separator. Alternatively, the refrigerant pressurizing so convenient, the use of solar energy to heat water is apparatus may comprise a compressor which receives compatible both with the diurnal cycle of the sun and vaporized refrigerant from the separator and which with the intermittent reduction in the availability of directs pressurized refrigerant vapor through a portion sunlight due to clouds. of the vapor conduit to the condenser. When a com Another advantage inherent in the use of sunlight to 20 pressor is utilized as the refrigerant pressurizing appara heat water involves the fact that the water need not be tus, a check valve is preferably provided at the outlet of heated to high temperatures. Typically, the operating the condenser to prevent refrigerant vapor from enter temperature range for a residential or commercial water ing the liquid conduit. Such a check valve may com heating system is between about 130 and about 150 F. 25 prise a chamber for receiving refrigerant flowing from Such a temperature range results in relatively high effi the condenser into the liquid conduit, a ball positioned ciency, and for this reason solar powered water heating within the chamber and having a density greater than systems do not require the use of highly sophisticated that of refrigerant vapor and less than that of refrigerant thermal collectors. liquid, structure for limiting upward movement of the Realizing the foregoing advantages, numerous at ball in the chamber when the chamber is filled with tempts have been made heretofore to provide a com 30 refrigerant liquid, and a seat for receiving the ball and mercially practical solar powered water heating system. thereby preventing the flow of refrigerant out of the However, none of the prior art systems has achieved real success in the marketplace. Perhaps one reason for chamber vapor.

when the chamber is filled with refrigerant this lack of success involves the fact that many of the In accordance with other aspects of the invention, the prior solar powered water heating systems have been 35 thermal unduly complicated. Certainly a major factor in the lack flat platescollector preferably comprises first and second which are spaced apart to define a refrigerant of consumer acceptance of solar powered water heating heating chamber therebetween. The first and second systems relates to high initial costs. It has been shown that the typical homeowner will not purchase any en plates preferably extend in divergent planes to define a refrigerant receiving zone wherein the plates are spaced ergy saving device unless it can be demonstrated that relatively close to one another and a refrigerant dis the device will pay for itself in energy savings within charge zone wherein the plates are positioned relatively about three to four years. apart from one another. One or more struts may be The present invention comprises a solar powered fluid heating system which overcomes the foregoing mounted within the refrigerant heating zone to prevent and other disadvantages long since associated with the 45 both inward and outward movement of the plates rela tive to each other.

prior art to provide a system that is uncomplicated in design and therefore low both in initial cost and mainte A third plate formed from a thermally insulative nance costs, and which is readily adapted to effect en material may be mounted within the refrigerant heating ergy savings of sufficient magnitude to return the initial zone between the first and second plates. The third cost in a minimum period of time. In accordance with 50 plate separates the refrigerant heating zone to an upper refrigerant path extending adjacent the first plate and a the broader aspects of the invention, a solar powered lower refrigerant path extending adjacent the second fluid heating system comprises a quantity of refrigerant, a thermal collector for heating and thereby at least plate. In such instances the first plate is positioned for partially vaporizing the refrigerant, a separator for sep exposure to sunlight so that refrigerant in the upper arating the vapor component, from any liquid compo 55 refrigerant path is adapted for solar heating. The second nent of the heated refrigerant, and a condenser for re plate is exposed to the ambient atmosphere so that re ceiving the vapor component of the heated refrigerant frigerant in the lower refrigerant path is adapted for and for transferring heat therefrom to a fluid to be heating by heat transfer from the atmosphere. heated. A vapor conduit preferably extends from the In accordance with yet another aspect of the inven thermal collector to the separator and from the separa 60 tion, a secondary refrigerant circuit may be utilized to tor to the condenser, and a liquid conduit preferably preheat the refrigerant within the thermal collector. In extends from the condenser to the separator and from such instances an evaporator is positioned for exposure the separator to the thermal collector. The thermal to the ambient atmosphere and a condenser is positioned collector, separator, condenser, vapor conduit, and within the refrigerant receiving zone of the thermal liquid conduit define a closed refrigerant circuit which 65 collector. The refrigerant in the secondary refrigerant contains the refrigerant, and refrigerant pressurizing circuit has a substantially lower boiling point than the apparatus is employed to cause the refrigerant to flow refrigerant in the primary refrigerant circuit so that through the closed refrigerant circuit. The refrigerant even at low temperatures when the sun is not shining, 11 heat is removed from the atmosphere and transferred to FIG. 12 is a perspective view showing a photovoltaic the refrigerant in the thermal collector. cell assembly which may be utilized in any of the em A similar secondary refrigerant circuit may be uti bodiments of the invention shown in FIGS. 1, 2 or 3; lized to remove excess heat from the thermal collector FIG. 13 is a top view of a thermal collector assembly during periods when the solar powered water heating which may be utilized in any of the embodiments of the system is stagnated. In such instances an evaporator is invention shown in FIGS. 1, 2 or 3; positioned within the refrigerant discharge Zone of the FIG. 14 is a sectional view taken along the line thermal collector and a condenser is positioned for 14-14 in FIG. 13 in the direction of the arrows; and contact with the ambient atmosphere. The refrigerant in FIG. 15 is a view similar to FIG. 14 illustrating a the secondary refrigerant circuit has a substantially 10 modification of the thermal collector assembly shown higher boiling point than the refrigerant utilized in the therein.

solar powered fluid heating system. Thus, whenever the DETALED DESCRIPTION temperature of the refrigerant in the thermal collector exceeds the boiling point of the refrigerant in the sec 15 Referring now to the Drawings, and particularly to FIG. 1 thereof, there is shown a solar powered fluid ondary refrigerant circuit the condenser of the second heating system 20 incorporating a first embodiment of ary refrigerant circuit is effective to transfer excess heat the invention.

from the thermal collector to the ambient atmosphere. a refrigerant asThe system 20 is of the type that utilizes Another important aspect of the invention involves refrigerants of the heatthe transfer medium. For example, type known as "FREON' may be the positioning of thermal collector panels, and in those 20 utilized in the practice of the invention. instances in which they are employed, the positioning of photovoltaic cell panels, for maximum exposure to solar anThe system 20 includes a thermal collector 22 having radiation throughout the entire day. Preferably, the 22 inlet is 24 and an outlet 26. In use, the thermal collector positioned to receive solar radiation. The thermal panels are mounted in an inverted T-shaped array. In collector 22 functions responsive to received solar radi this manner the erect panels are positioned for maxi 25 ation to heat the refrigerant mum exposure to sunlight at dawn and at dusk, the particular refrigerant utilizedflowing therethrough. The prone panels are positioned for maximum exposure to lected, and the thermal collector 22 issystem sunlight at midday, and combinations of panels are posi that the refrigerant is received through the inlet 24such designed tioned for maximum exposure to sunlight at intermedi the thermal collector 22 in the liquid phase and is at ate hours of the day. The outputs of all of the panels are 30 least partially vaporized before flowing out of the ther added to provide a combined output which is optimized mal collector 22 through the outlet 26. throughout all of the daylight hours. A vapor conduit 30 includes a first portion 32 extend DESCRIPTION OF THE DRAWINGS ing from the outlet 26 of the thermal collector 22 to a separator 34. The separator 34 is illustrated in the draw

A more complete understanding of the invention may 35 ings as a separate vessel, but may in fact comprise part be had by reference to the following Detailed Descrip of the structure of the thermal collector 22, if desired. tion when taken in conjunction with the accompanying The separator 34 receives heated refrigerant from the Drawings, wherein: thermal collector 22 and functions to separate the vapor FIG. 1 is a diagrammatic illustration of a solar pow component of the heated refrigerant from any liquid ered fluid heating system incorporating a first embodi component thereof. The vapor component of the heated ment of the invention; refrigerant flows out of the separator 34 through a sec FIG. 2 is an illustration similar to FIG. 1 showing a ond portion 36 of the vapor conduit 30. second embodiment of the invention; A liquid conduit 40 includes a first portion 42 con FIG. 2a is an enlargement of a portion of the solar prising an inlet to the separator 34 and a second portion powered fluid heating system of FIG. 2; 45 44 comprising an outlet therefrom. If the heated refrig FIG. 3 is an illustration similar to FIG. 1 showing a erant flowing out of the thermal collector 22 has a liquid third embodiment of the invention; component, such liquid component does not flow out of FIG. 4 is a top view of a thermal collector which may the separator 34 through the second portion 36 of the be utilized in any of the embodiments of the invention vapor conduit 30. Instead, any liquid component of the shown in FIGS. 1, 2 or 3; 50 heated refrigerant flows through the separator 34 and FIG. 5 is a sectional view taken along the line 5-5 in through the second portion 44 of the liquid conduit 40 FIG. 4; and is returned thereby to the thermal collector 22 FIG. 6 is a top view of a thermal collector assembly through the inlet 24.

which may be utilized in any of the embodiments of the The vapor component of the heated refrigerant flows invention illustrated in FIGS. 1, 2 or 3; 55 through the second portion 36 of the vapor conduit 30 FIG. 7 is an end view of the thermal collector assem to a condenser 48. The condenser 48 is located in a bly of FIG. 6 in which certain parts have been broken quantity of water 50 which is in turn contained by a tank away more clearly to illustrate certain features of the 52. The condenser 48 transfers heat from the refrigerant invention; to the quantity of water 50 and in so doing returns the FIG. 8 is a diagrammatic illustration of a thermal 60 refrigerant from the vapor phase to the liquid phase. collector assembly which may be utilized in the practice Liquid refrigerant flows out of the condenser 48 into an of the invention; accumulator 54, and out of the accumulator 54 through FIG. 9 is a top view of the thermal collector assembly a third portion 56 of the liquid conduit 40 to a pump 58. of FIG. 8: The pump 58 is driven by a motor 60. The pump 58 FIG. i0 is a sectional view taken along the lines 65 functions to receive liquid refrigerant from the con 10-10 in FIG. 9 in the direction of the arrows; denser 48 through the accumulator 54 and to direct FIG. 11 is an enlarged sectional view taken along the pressurized liquid refrigerant through the first portion lines 11-11 in FIG. 10 in the direction of the arrows; 42 of the liquid conduit 40. Liquid refrigerant flowing 12 through the first portion 42 of the liquid conduit 40 valve 106, and the tank has a drain valve 108. The func enters the separator 34 and is then returned to the ther tion of the relief valves 102 and 104 is to automatically mal collector 22 through the second portion 44 of the release excess pressure from the refrigerant circuit and liquid conduit 40 and the inlet 24 of the thermal collec from the tank 52, respectively, and the function of the tor 22. 5. drain valves 106 and 108 is to facilitate the removal of It will thus be understood that the thermal collector refrigerant from the refrigerant circuit and water from 22, the separator 34, the condenser 48 including the the tank 52, respectively.

accumulator 54, the vapor conduit 30 and the liquid The closed refrigerant circuit of the solar powered conduit 40 comprise a closed refrigerant circuit having fluid heating system 20 further includes a pair of upper a predetermined quantity of refrigerant therein, The 10 sight glasses 112 and 114 forming part of the second function of the refrigerant is to receive solar energy by portion 36 of the vapor conduit 30 and a lower sight means of the thermal accumulator 22 and to transfer the glass 116 forming part of the third portion 56 of the received thermal energy to the quantity of water 50 by liquid conduit 40. The function of the sight glasses 112, means of the condenser 48. The function of the pump 58 114 and 116 is to facilitate the filling of the closed refrig is to effect the flow of refrigerant through the closed 5 erant circuit with refrigerant. In each instance the air is refrigerant circuit. first purged from the refrigerant circuit in the conven The solar powered fluid heating system 20 further tional manner.

comprises a photovoltaic collector 62. The photovol Assume first that the temperature of the thermal col taic collector 62 comprises a plurality of photovoltaic lector 22 is higher than that of the quantity of water 50 cells 64 which are mounted in a panel 66. The function 20 in the tank 52. In such a case the upper sight glasses 112 of the photovoltaic collector 62 is to receive solar en and 114 are used to determine the proper refrigerant ergy and to produce an electrical output in response level. Refrigerant is added to the circuit until it is ob thereto. The photovoltaic collector 62 has an output servable in the sight glass 114 but is not observable in terminal 68 which is connected to the motor 60 through the sight glass 112. This assures that the proper quantity a line 70. An external power source may be used to 25 of the refrigerant has been added to the circuit. actuate the motor 60 in lieu of the photovoltaic collec Assume now that the temperature of the quantity of tor. 62, if desired. water 50 in the tank 52 is higher than the temperature of A temperature sensor 74 is mounted in the tank 52 the thermal collector 22. In such cases the sight glass and extends into contact with the quantity of water 50 116 is utilized to determine the proper refrigerant level. contained therein. The temperature sensor 74 is con 30 inRefrigerant is added to the system until it is observable the sight glass 116. This assures that a proper quantity nected to a switch 76 through a line 78. Whenever the temperature of the quantity of water 50 in the tank 52 of refrigerant has been added to the circuit. exceeds a preset limit, the temperature sensor 74 actu The operation of the solar powered fluid heating ates the switch 76 to discontinue the flow of electrical system 20 will be readily understood upon consider energy from the photovoltaic collector 62 to the motor 35 ation of three different operating conditions. Assume 60. . first that the sun is shining and that hot water is being A float switch 80 is mounted in the accumulator 54. used. Refrigerant is heated in the thermal collector 22, The float switch 80 is connected to a switch 82 through and heated refrigerant flows out of the thermal collec a line 84. The float switch 80 actuates the switch 82 to tor 22 through the outlet 26 and the first portion 32 of discontinue the flow of electrical energy from the pho the vapor conduit to the separator 34. In the separator tovoltaic collector 62 to the motor 60 whenever the 34 the vapor component of the heated refrigerant is liquid refrigerant in the accumulator 54 falls below a separated from any liquid component thereof, and the predetermined level. vapor component of the heated refrigerant then flows The tank.52 is preferably conventional in design and through the second portion 36 of the vapor conduit 30 construction. The tank.52 is preferably either formed 45 to In the condenser 48.

the condenser 48 heat is transferred from the re from or is surrounded by a thermally insulating material to prevent the loss of heat from the quantity of water 50 frigerant to the quantity of water 50 in the tank 52, and contained within the tank 52. The tank 52 is provided the refrigerant is simultaneously returned from the with an auxiliary heating apparatus 88 which functions vapor phase to the liquid phase. Liquid refrigerant to heat the quantity of water 50 whenever insufficient 50 flows out of condenser 48 through the accumulator 54 solar energy is available for such purpose. It will be and through the third portion 56 of the liquid conduit 40 understood that although an electrical auxiliary heating to the pump 58.

: apparatus 88 is illustrated in FIG.1, the auxiliary heat The pump 58 is driven by the motor 60 and functions ing apparatus 88 is entirely conventional in design and to direct pressurized liquid refrigerant through the first may be adapted for actuation by any convenient type of 55 portion 42 of the liquid conduit 40 to the separator 34. fuel. Liquid refrigerant received in the separator 34, either Cold water is received in the tank 52 through an inlet through the first portion 32 of the vapor conduit 30 or line 90. Hot water is withdrawn from the tank 52 through the first portion 42 of the liquid conduit 40, is through a line 92. The line 92 and a line 94 connected to withdrawn from the separator 34 through the second the inlet line 90 both extend to a blending valve 96. The 60 portion 44 of the liquid conduit 30 and is directed to the blending valve 96 combines hot water from the line 92 thermal collector 22 through the inlet 24. At this point and cold water from the line 94 in proper proportions to the foregoing cycle of operation is repeated and is thus prevent delivery of water at a desired temperature continuous in nature.

above a predetermined maximum through an outlet line The pump 58 is driven by the motor 60 which is in 98. 65 turn driven by electrical energy supplied either from The closed refrigerant circuit includes a relief valve the photovoltaic collector 62 through the line 70 or 102, and the tank 52 is provided with a relief valve 104. from an external source. If the temperature of the quan The closed refrigerant circuit further includes a drain tity of water 50 in the tank 52 exceeds a predetermined 13 limit, the temperature sensor 74 actuates the switch 76 ture or pressure levels. If the sun is not shining and hot to interrupt the flow of electrical energy to the motor water is being used the auxiliary heating system 88 60 and operation of the system 20 ceases. Likewise, if automatically functions to maintain the quantity of the accumulator 54 is not full of liquid refrigerant the water 50 within the tank 52 within a predetermined float switch 80 actuates the switch 82 to interrupt the temperature range.

flow of electrical energy to the motor 60 and operation Referring now to FIG. 2, there is shown a solar pow of the system 20 ceases. ered fluid heating system 120 incorporating a second Assume now that the sun is shining but that no hot embodiment of the invention. The system 120 utilizes water is being used. The foregoing cycle of operation numerous component parts which are substantially continues until the temperature of the quantity of water O identical in construction and function to component 50 in the tank 52 reaches a predetermined upper limit. parts of the solar powered fluid heating system 20 illus At this point the temperature sensor 74 actuates the trated in FIG. 1. Such identical component parts are switch 76 to interrupt the flow of electrical energy to designated in FIG. 2 with the same reference numerals the motor 60. Thereafter, liquid refrigerant is no longer utilized in the description of the system 20, but are returned to the separator 34 by the pump 58. 15 differentiated therefrom by means of a prime () desig The thermal collector 22 temporarily continues to nation.

generate heated refrigerant. The vapor component of The primary distinction between the solar powered the heated refrigerant continues to flow to the con fluid heating system 120 of FIG. 2 and the system 20 of denser 48 through the second portion 36 of the liquid FIG. 1 involves the fact that in lieu of the pump 58 and conduit 30. However, liquid refrigerant is not returned 20 the motor 60 of the system 20, the system 120 employs from the condenser 48 to the separator 34, but instead a compressor 122 driven by a motor 124. Compressor accumulates in the condenser 48, in the accumulator 54, 120 receives heated refrigerant vapor from the separa in the third portion 56 of the liquid conduit 40 and in the tor 34 through the second portion 36' of the refrigerant lower part of the first portion 42 of the liquid conduit conduit 30' and directs pressurized refrigerant vapor to 40. the condenser 48" through a third portion 126 of the Eventually all of the refrigerant is exhausted from the vapor conduit 30'.

separator 34 and from the thermal collector 22. There The motor 124 and therefore the compressor 122 is fore, although the system 20 is in the so-called stagna driven by electrical energy supplied from the photovol tion condition, the system 20 cannot reach excessive taic collector 62". Alternatively, the motor 124 and temperature or pressure levels. This is because all of the 30 therefore the compressor 122 is driven by electrical refrigerant is exhausted from the thermal collector 22, energy supplied from a generator 128 through a line whereupon further heating thereof cannot take place. 130. The generator 128 is in turn driven by a windmill The system 20 simply remains in the stagnation condi 132. A switch 134 prevents the backflow of electrical tion until the temperature of the quantity of water 50 in energy from the generator 128 to the photovoltaic col the tank 52 is reduced, whereupon the operating cycle 35 lector 62 through the line 70'. The motor 124 and there of the system 20 is automatically restarted. fore the compressor 122 may be drawn by electrical Assume now that hot water is being withdrawn from energy supplied from an external source, if desired. the tank 52 but that the sun is not shining. In such in Another distinction between the solar powered fluid stances the system 20 does not operate. The refrigerant heating system 120 of FIG. 2 and the system 20 of FIG. in the closed refrigerant circuit then accumulates either 1 involves the use of a check valve assembly 136 to in the thermal collector 22 and the separator 34, if the prevent the flow of refrigerant in the vapor phase into temperature of the quantity of water in the tank 52 is the first portion 42" of the liquid conduit 40'. As is best higher than the temperature of the thermal collector 22, shown in FIG. 2a, the check valve assembly 136 in or in the condenser 48, the third portion 56 of the liquid cludes a chamber 140 which receives refrigerant from conduit 40 and the lower part of the first portion 42 of 45 the condenser 48" through an inlet 142 and which dis the liquid conduit 40, if the temperature of the thermal charges refrigerant into the first portion 42 of the liquid collector is higher than that of the quantity of water 50 conduit 40' through an outlet 144. A ball 146 is mounted in the tank 52. In either event the system 20 quickly within the chamber 140.

comes to equilibrium, and any significant flow of refrig The ball 146 has a predetermined density which is erant through the closed refrigerant circuit is discontin 50 substantially less than that of the refrigerant in the ued. closed refrigerant circuit of the system 120 when the The fact that the sun is not shining when there is a refrigerant is in the liquid phase and is substantially demand from hot water does not mean that hot water is greater than that of the refrigerant in the closed refrig unavailable from the tank 52. To the contrary, in such erant circuit when the refrigerant is in the vapor phase. circumstances the auxiliary heating apparatus 88 is auto 55 A screen 150 extends across the chamber 140 to limit matically actuated to heat the quantity of water 50 in upward movement of the ball 146 when the chamber the tank to a predetermined temperature range. When 140 is filled with liquid refrigerant. A valve seat 152 is the auxiliary heating apparatus 88 is operating the tank positioned to receive the ball 146 if liquid refrigerant is 52 functions in the manner of a conventional water drained therefron.

heater. 60 It will be understood that in the normal operation of It will thus be understood that the solar powered the system 120 the chamber 140 is continuously filled fluid heating system 20 comprises a virtually fail safe with liquid refrigerant. The ball 146 therefore normally system for providing hot water. Under normal operat floats upwardly in the chamber 140 with the upward ing conditions the system 20 operates continuously to movement of the ball 146 being limited by the screen heat the quantity of water 50 within the tank 52. If the 65 150. If for any reason liquid refrigerant is drained out of sun is shining but no hot water is being used the system the chamber 140 the ball 146 moves downwardly into 20 eventually discontinues operation, but under circum engagement with the valve seat 152. The ball 146 and stances not involving any danger of excessive tempera the valve seat 152 thereafter cooperate to prevent, the 14 discharge of refrigerant in the vapor phase into the or 160 illustrated in FIGS. 1, 2 and 3, respectively. The liquid conduit 40' through the outlet 144. thermal collector assembly 180 includes first and second The operation of the solar powered fluid heating plates 182 and 184 which are preferably formed from system 120 is substantially identical to that of the solar metal. Although illustrated as flat in FIGS. 4 and 5, powered fluid heating system 20. One advantage in the plates 182 and 184 may be strengthened by means of use of the solar powered fluid heating system 120 shown corrugations, if desired. In any event at least the first in FIG. 2 is that the system 120 is capable of operating plate 182 must be formed from a material which is as a heat pump. Under such circumstances the system highly thermally conductive. The outer surface of the 120 is adapted to heat the quantity of water 50' in the first plate 182 is preferably finished utilizing conven tank 52' even though the sun is not shining. 10 tional techniques in such a way as to be highly absor For example, consider a warm, breezy summer eve bent of and therefore highly nonreflective of solar radi ning. Under such circumstances windmill 132 actuates ation.

the generator 128 to produce electrical energy which in A pair of end walls 186 and a pair of side walls 188 turn actuates the motor 124 to drive the compressor extend along the ends and sides of the first and second 122. Heat from the atmosphere vaporizes the refrigerant 15 plates 182 and 184, respectively. The end walls 186 and in the thermal collector 22". The compressor 122 deliv the side walls 188 are secured to the plates 182 and 184 ers the heated refrigerant vapor from the separator 34' for cooperation therewith to define a substantially to the condenser 48", whereby the quantity of water 50' closed refrigerant heating chamber. The first and sec in the tank 52' is heated even though the sun is not ond plates 182 and 184 extend in divergent planes to shining. 20 define a refrigerant receiving zone 190 wherein the Referring now to FIG. 3, there is shown a solar pow plates 182 and 184 are positioned relatively close to one ered fluid heating system 160 incorporating a third another, and a refrigerant discharge zone 192 wherein embodiment of the invention. The system 160 incorpo the plates 182 and 184 are positioned relatively apart rates numerous component parts which are substan from one another. A refrigerant inlet 194 extends to the tially identical in construction and function to the com 25 refrigerant receiving zone 190 of the refrigerant heating ponent parts of the solar powered fluid heating system chamber, and a refrigerant outlet 196 extends from the 20 shown in FIG. 1. Such identical component parts are refrigerant discharge 192 of the refrigerant heating designated in FIG. 3 with the same reference numerals chamber.

utilized hereinabove in the description of the system 20, A plurality of struts 198 are positioned within the but are differentiated therefrom by means of a double 30 refrigerant heating zone of the thermal collector assem prime (') designation. bly 180. Each strut 198 is connected between the first The primary distinction between the solar powered and second plates 182 and 184 and serves to prevent fluid heating system 160 of FIG.3 and the solar pow both inward and outward movement of the plates rela ered fluid heating system 20 of FIG. 1 relates to the fact tive to each other. The struts 198 extend generally par that the system 160 includes a turbine 162. The turbine 35 allel to and are spaced apart from the side walls 188. 162 receives heated refrigerant vapor from the separa The struts extend to ends 200 which are spaced apart tor 34" and is driven thereby. Refrigerant vapor dis from the end walls 186. The size, shape and positioning charged from the turbine 162 is directed to the con of the struts 198 relative to the side walls 188 and the denser 48" through a thrid portion 164 of the vapor end walls 186 is selected so as to not impede the flow of conduit 30'. refrigerant throughout the refrigerant heating chamber. Upon actuation by heated refrigerant vapor flowing It will be noted that, except for the negligible area in through the vapor conduit 30", the turbine 162 drives a with the plate 182 engages the struts 198, the entire generator 166. The generator 166 produces an electrical interior surface area of the plate 182 is in contact with output which is directed to the pump 60' through a line refrigerant contained within the refrigerant heating 168 and part of the line 70'. A switch 170 prevents 45 chamber. This feature of the thermal collector assembly backflow of electrical energy from the generator 166 to 180 is highly important in that it greatly enhances the the photovoltaic collector 62'. flow of solar energy into the thermal collector as com The primary advantage arriving from the use of the pared with prior designs.

system 160 involves the fact that because the turbine The thermal collector assembly 180 further includes a 162 and the generator 166 are incorporated therein, the 50 frame 202. The frame 202 includes a panel 204 overly system 160 may employ a larger thermal collector and a ing the first plate 182. The panel 204 is formed from a smaller photovoltaic collector when compared with the material which is highly transparent to solar radiation, equivalent components of the system 20. During the for example, glass. The panel 204 and the remainder of initial phase of the operation of the system 160, electri the frame 202 define a closed chamber 206 overlying the cal energy from driving the motor 60' and therefore the 55 first plate 182.

pump 58' is supplied from the photovoltaic collector The remainder of the frame 202 may be formed from 62". However, when the system 160 is in full operation any convenient material, for example, metal, plastic, the thermal collector 22" supplies refrigerant vapor in wood, etc. In certain applications of the thermal collec sufficient quantity both to operate the turbine 162 and to tor assembly 180 it will be desirable to thermally insu heat the quantity of water 50' in the tank 52' by means 60 late the plate 184, the end walls 186 and the side walls of the condenser 48". Under such circumstances electri 188 which cooperate with the plate 182 to define the cal energy for driving the pump 58' is primarily sup refrigerant heating chamber. In such instances a layer of plied by the generator 166 under the actuation of the insulation 208 is provided between the frame 202 and turbine 162. Otherwise, the operation of the system 160 the plate 184, the end walls 186 and the side walls 188. is substantially identical to that of the system 120. 65 In other applications of the thermal collector assem Referring now to FIGS. 4 and 5, there is shown a bly 180 it will be desirable to expose the plate 184 to thermal collector assembly 180 which may be utilized in solar radiation. In such cases the portion of the frame any of the solar powered fluid heating systems 20, 120 202 overlying the panel 184 is formed from a material 15 such as glass and the portion of the layer of insulation assembly 220. This procedure continues until the refrig 208 extending adjacent the panel 184 is omitted. In still erant in the refrigerant heating chamber of the thermal other applications of the thermal collector assembly 180 collector assembly 220 has been heated sufficiently to it will be desirable to expose the plate 184 to the ambienteffect vaporization thereof. The refrigerant vapor then atmosphere. In such cases the frame 202 is constructed flows through the outlet 196' of the thermal collector to seal the chamber 206, the layer of insulation 208 is assembly 220 to the separator and from the separator to omitted entirely, and the frame 202 is constructed in an the compressor which in turn directs compressed refrig open configuration to allow the passage of the ambient erant vapor to the condenser of the solar powered fluid atmosphere therethrough. heating system. In this manner the solar powered fluid Referring now to FIGS. 6 and 7, there is shown a O heating system is adapted to produce hot water even at thermal collector assembly 220 which may be utilized in temperatures substantially below the vaporization tem any of the solar powered fluid heating systems 20, 120 perature of the refrigerant in the primary refrigerant or 160 shown in FIGS. 1, 2 and 3, respectively. The circuit thereof.

thermal collector assembly 220 incorporates numerous The heat dissipating assembly 224 comprises an evap component parts which are substantially identical to 15 orator 240 positioned within the refrigerant discharge component parts of the thermal collector assembly 180 zone 192" of the thermal collector assembly 220. A shown in FIGS. 4 and 5. Such identical component condenser 242 is adapted to discharge heat to the ambi parts are designated in FIGS. 6 and 7 with the same ent atmosphere. To this end, the condenser 242 is pro reference numerals utilized hereinabove in the descrip vided with a plurality of heat dissipating fins 244. Other tion of the thermal collector assembly 180, but are dif 20 conventional techniques for maximizing exposure of the ferentiated therefrom by means of a prime () designa condenser" 242 to the ambient atmosphere may be uti tion. lized in the practice of the invention if desired. A refrig The thermal collector assembly 220 differs from the erant conduit 246 includes a first portion 248 extending thermal collector 180 in that it incorporates a preheater from the evaporator 240 to the condenser 242 and a assembly 222 and a heat dissipating assembly 224. As 25 second portion 250 extending from the condenser 242 to will be appreciated by those skilled in the art, the pre the evaporator 240.

heater assembly 222 may be utilized with or without the The heat dissipating assembly 224 is charged with the heat dissipating assembly 224, and vice versa. That is, refrigerant having a substantially higher boiling point although the preheater assembly 222 and the heat dissi than the boiling point of the refrigerant in the refriger pating assembly 224 are illustrated in conjunction with 30 ant heating chamber of the thermal collector assembly the same thermal collector assembly 220, the two as 220. As will be appreciated, certain operating condi semblies are actually entirely distinct from each other, tions of a solar powered fluid heating system can occur both in construction and in function. in which the temperature within the thermal collector The preheating assembly 222 includes an evaporator assembly of the system rises significantly. In any such 226 adapted to receive heat from the ambient atmo 35 instance the refrigerant in the evaporator 240 is vapor sphere. To this end, the evaporator 226 may be pro ized. The refrigerant vapor then flows into the con vided with a plurality of fins 228. Other conventional denser 242, whereupon heat is removed from the refrig techniques for enhancing the exposure of the evapora erant and is discharged into the ambient atmosphere. In tor 226 to the ambient atmosphere may be utilized in the this manner protection against excessive temperature practice of the invention, if desired. The assembly 226 within the refrigerant heating chamber of the thermal further includes a condenser 230 positioned in the re collector assembly 220 is assured.

frigerant heating chamber of the thermal collector as A thermal collector assembly 260 constructed in ac sembly 220, and specifically in the refrigerant receiving cordance with the invention is diagrammatically illus zone 190' thereof. A refrigerant conduit 232 includes a trated in FIG. 8. The thermal collector assembly 260 first portion 234 extending from the evaporator 226 to 45 includes first and second plates 262 and 264 each formed the condenser 230 and a second portion 236 extending from a thermally conductive material. The plates 262 from the condenser 230 to the evaporator 226. and 264 may be corrugated for strength, if desired. The The preheater assembly 222 is particularly adapted first and second plates 262 and 264 define a refrigerant for use in conjunction with embodiments of the inven heating chamber therebetween. The plates 262 and 264 tion such as that shown in FIG. 2 wherein a compressor 50 extend in divergent planes to define a refrigerant receiv is utilized to receive refrigerant vapor from the separa ing zone 266 wherein the plates 262 and 264 are posi tor and to direct pressurized refrigerant vapor to the tioned relatively close to one another and a refrigerant condenser. In such instances the preheater assembly 222 discharge zone 268 wherein the plates 262 and 264 are is preferably charged with a refrigerant having a sub positioned relatively apart from each other. stantially lower boiling point than the boiling point of 55 A frame 270 supports the plates 262 and 264 and the the refrigerant in the refrigerant heating chamber of the refrigerant heating zone defined therebetween on the thermal collector assembly 220. The refrigerant in the surface 272 of a roof. The frame 270 supports the plate preheater assembly 222 is therefore adapted for vapori 264 in a spaced apart relationship with respect to the zation in the evaporator 226 at temperatures substan roof surface 272. The frame 270 includes a plate 274 tially below the boiling point of the refrigerant in the 60 which is transparent to solar radiation. The plates 274 refrigerant heating chamber of the thermal collector together with other components of the frame 270 form assembly 220, and regardless of whether or not the sun a closed chamber 276 surrounding the plate 262 of the is shining. thermal collector assembly 260. Refrigerant vapor flows from the evaporator 226 A third plate 278 formed from a thermally insulating through the refrigerant conduit 232 to the condenser 65 material is positioned within the refrigerant heating 230, wherein heat is transferred from the refrigerant of zone between the first and second plates 262 and 264. the preheater assembly 222 to the refrigerant within the The third plate 278 is positioned substantially equidis refrigerant heating chamber of the thermal collector tant from the first and second plates 262 and 264, and 16 extends the entire distance between the refrigerant re ing structure 340 for preventing relative movement ceiving zone 266 and the refrigerant discharge zone 268. between the erect portion 336 and the prone portion 334 The third plate 278 devides the refrigerant heating of the frame. For example, the bracing structure 340 chamber into an upper refrigerant path 280 extending may comprise cables 342 secured to suitable fasteners adjacent the first plate 262 and the second refrigerant 344, etc.

path 282 extending adjacent the second plate 264. Re The prone portion 334 of the frame 332 includes a frigerant in the first refrigerant path 280 is adapted for first support surface 346, and the erect portion 336 of heating by solar radiation which passes through the the frame includes a second support surface 348. The plate 274 of the frame 270 and through the first plate 262 second support surface 348 extends perpendicularly to heat the refrigerant in the first refrigerant path. Re 10 with respect to the first support surface 346. The erect frigerant in the second refrigerant path 282 is adapted to portion 336 of the frame further includes a third support receive heat from the ambient atmosphere through the surface 350 which extends parallel to but which faces in second plate 264. Thus, the thermal collector assembly the opposite direction from the second support surface 260 is adapted to produce refrigerant vapor either when 348. The prone portion of the frame 334 further includes the sun is shining or when the temperature of the sur 15 a fourth support surface 352 which extends parallel to, rounding atmosphere is sufficiently high to vaporize the refrigerant in the refrigerant heating chamber thereof. and preferably comprises an extension of the first sup port surface 356.

Heated refrigerant flows from the thermal collector The photovoltaic cell assembly 330 further comprises assembly 260 through a vapor conduit 288 including a a first array of photovoltaic cells 356 mounted on the first portion 290 extending from the refrigerant dis 20 first support surface 346; a second array of photovoltaic charge zone 268 of the thermal collector assembly 260 cells 358 mounted on the second support surface 348; a to a separator 292 and a second portion 294 extending from the separator 292 to a condenser (not shown). third third array of photovoltaic cells 360 mounted on the support surface 350 and a fourth array of photo

Liquid refrigerant is returned to the thermal collector voltaic cells 362 mounted on the fourth support surface assembly 260 from the condenser through a liquid con 352. The arrays of photovoltaic cells 356, 358, 360 and duit 298 including a first portion 300 extending from the 362 are each mounted in a frame 364, and the frames 364 condenser to the separator 292 and a second portion 302 are secured to the frame 332 by means of suitable fasten extending from the separator 292 to the refrigerant ers 366. Each of the arrays receiving zone 266 of the thermal collector assembly 358, 360 and 362 produces an of photovoltaic cells 356, output, and the outputs of 260. It will thus be understood that the thermal collec the arrays of photovoltaic cells are added tor assembly 260 is adapted for use with any of the solar produce a combined output which is together to optimized powered fluid heating systems 20, 120 or 160 shown in throughout the entire day.

FIGS. 1, 2 and 3, respectively. Operation of the photovoltaic cell assembly 330 will The structural detail of the thermal collector assem bly are illustrated in FIG. 9, 10 and 11. The frame 270 of the 35 best understood by consideration of the positioning includes legs 304 which support the plate 264 above the positionsunofatthevarious sun times during the day. At dawn the relative to the assembly 330 is repre underlying surface 272. The plates 262 and 264 may sented by the arrow 370. At such time the array of comprise part of an elongate plate 306 which is bent photovoltaic around a suitable form to provide curved end portions of the rays ofcells 360 is positioned directly in the path the sun, while the remaining photo cell 308 and 310. The ends of the plate 306 are overlapped at arrays comprised in the assembly 330 are positioned a convenient location 312 and are welded or brazed substantially out of the path of the rays of the sun. At together, The refrigerant heating chamber of the ther mid-morning mal collector assembly 260 is then closed by side plates the sun is positioned as represented by the 314 extending along and joined to the opposite edges of arrow 372. At such time the photovoltaic cell arrays the plate 306. 45 360 and 362 are positioned for combined maximum The third plate 278 of the thermal collector assembly exposure to the rays of the sun, while the photovoltaic 260 preferably comprises part of a third plate/strut cell arrays 356 and 358 are positioned substantially out assembly 320. As is best shown in FIG. 11, in addition to of the path of the rays of the sun. At mid-day the posi the third plate portion 278, the third plate/strut assem tion of the sun is represented by the arrow 374. At such bly 320 includes a plurality of strut portions 322 each 50 time the photovoltaic cell array 356 and 362 are posi extending outwardly from the third plate portion 278 tioned for maximum exposure to the rays of the sun, while the photovoltaic cell arrays 358 and 360 are posi into engagement with the interior surfaces of the plates tioned 262 and 264. The third plate/strut assembly 320 further substantially out of the path of the rays of the includes a plurality of fasteners 324 each extending sun. At mid-afternoon the position of the sun is repre through the plates 262 and 264 and through one of the 55 sented by the arrow 376. At such time the photovoltaic strut portions 322. By means of the strut portions 322 cell arrays 356 and 358 are positioned for combined and the fasteners 324 the third plate/strut assembly 320 maximum exposure to the rays of the sun, while the serves to prevent both inward and outward movement photovoltaic cell arrays 360 and 362 are substantially of the plates 262 and 264 relative to one another. non-exposed to the rays of the sun. At dusk the position FIG. 12 illustrates a photovoltaic cell assembly 330 60 of the sun is represented by the arrow 378. At such time which may be utilized in conjunction with any of the the photovoltaic cell 358 is positioned for maximum solar powered fluid heating systems 20, 120 or 160 illus exposure to the rays of the sun, while the remaining trated in FIGS. 1, 2 and 3. The photovoltaic cell assem photovoltaic cell arrays are not significantly exposed bly 330 includes a frame 332 including a prone portion thereto. It will thus be understood that by adding the 334 and an erect portion 336. The erect 336 is preferably 65 outputs of the photovoltaic cell arrays 356, 358, 360 and secured to the prone portion 334 by means of fasteners 362 the photovoltaic cell assembly 330 produces a com 338 to facilitate disassembly of the frame 332 for ship bined output which is optimized throughout all of the ping, etc. The frame 332 further includes suitable brac daylight hours,

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FIGS. 3 and 14 illustrate a thermal collector assem Although preferred embodiments of the invention bly 390 which may be utilized in any of the solar pow have been illustrated in the accompanying Drawings ered fluid heating systems 20, 120 or 160 illustrated in and described in the foregoing Detailed Description, it FIGS. 1, 2 and 3, respectively. The thermal collector will be understood that the invention is not limited to assembly 390 comprises three thermal collectors 392, 5 the embodiments disclosed, but is capable of numerous 394 and 396. The three thermal collectors 392, 394 and rearrangements, modifications, and substitutions of 396 receive liquid refrigerant from a common inlet con parts and elements without departing from the spirit of duit 398 and are connected thereto through isolation the invention.

valves 400. The three thermal collectors 392, 394 and We claim:

396 discharge heated refrigerant through a common O 1. A solar powered fluid heating system comprising: outlet conduit 402 and are connected therethrough to a predetermined quantity of refrigerant; isolation valves 404. The use of the isolation valves 400 a thermal collector for heating the refrigerant and and 404 permits any of the thermal collectors to be including:

disconnected from the refrigerant circuit to facilitate 15 (a) first and second spaced apart panels, at least the repair, etc. first panel being formed from a thermally con The thermal collector 392,394 and 396 are preferably ductive material;

constructed as shown in FIGS. 4 and 5. The teachings (b) connector panel means extending between and of drawing FIGS. 6 through 11 may also be utilized in connected to the first and second panel for coop the construction of the thermal collectors comprising eration therewith to define a substantially closed the assembly 390, if desired. However, as is best shown refrigerant heating chamber; in FIG. 14, the thermal collector 394 has a second plate (c) inlet means for admitting liquid refrigerant to 406 which is exposed to solar radiation through a panel the refrigerant heating chamber; 408 formed from a material which is transparent to solar (d) the first and second panels comprising the ther radiation, for example, glass. 25 mal collector extend in divergent planes to de The operation of the thermal collector assembly 390 fine a refrigerant receiving zone wherein the first will be best understood by consideration of the position and second panels are positioned relatively close of the sun at various times during the day. At dawn, the to one another and a refrigerant discharge Zone sun is positioned as represented by the arrow 410, and wherein the first and second panels are posi the thermal collector 394 is thus positioned for maxi tioned relatively apart from one another; mum exposure to the rays of the sun. At mid-morning (e) outlet means for exhausting vapor refrigerant the sun is positioned as represented by the arrow 412, from the refrigerant heating chamber; and and the thermal collectors 394 and 396 are positioned (f) baffle means positioned within the refrigerant for combined maximum exposure to the rays of the sun. heating chamber and connected between the first At mid-day the sun is positioned as represented by the 35 and second panels for preventing both inward arrow 414, and the thermal collectors 392 and 396 are and outward movement therebetween; positioned for maximum exposure to the rays of the sun. (g) said baffle means being spaced apart from the At mid-afternoon the sun is positioned as represented by connector panel means to facilitate refrigerant the arrow 416, and the thermal collectors 392 and 394 flow through the refrigerant heating chamber; are positioned for combined maximum exposure to the separator means for receiving heated refrigerant from rays of the sun. At dusk the sun is positioned as repre the thermal collector and for separating the vapor sented by the arrow 418, and the thermal collector 394 component of the heated refrigerant from any liq is once again positioned for maximum exposure to the uid component thereof;

rays of the sun. Since the outputs of the thermal collec a condenser for receiving the vapor component of the tors 392,394 and 396 are added together, it will thus be 45 heated refrigerant from the separator means; understood that the thermal collector assembly 390 a supply of fluid to be heated; produces a combined output which is optimized means for transferring heat from the refrigerant in the throughout all of the daylight hours. condenser to the fluid and thereby returning the FIG. 15 illustrates a thermal collector assembly 420. : refrigerant vapor to the liquid phase; Many of the component parts of the thermal collector 50 vapor conduit means extending from the separator assembly 420 are substantially identical in construction means to the condenser;

and function to component parts of the thermal collec liquid conduit means extending from the condenser to tor assembly 390 illustrated in FIGS. 13 and 14. Such the inlet means of the thermal collector; identical component parts are identified in FIG. 15 with said thermal collector, separator means, condenser, the same reference numerals utilized hereinabove in the 55 vapor conduit means and liquid conduit means description of the thermal collector assembly 390, but comprising a closed refrigerant circuit which con are differentiated therefrom by means of a prime () tains the predetermined quantity of refrigerant; and designation. refrigerant pressurizing means for causing the refrig The primary distinction between the thermal collec erant to flow through the closed refrigerant circuit. tor assembly 390 and thermal collector assembly 420 60 2. The solar powered fluid heating system according comprises the fact that as opposed to a single upright to claim 1 further comprising solar powered means for thermal collector 394, the thermal collector assembly actuating the refrigerant pressurizing means. 420 employs dual upright thermal collectors 424 and 3. The solar powered fluid heating system according 426. The collectors 424 and 426 are separated by layers to claim 2 wherein the solar powered means comprises of thermally insulative material 428. Otherwise, the 65 a plurality of photovoltaic cells.

construction and operation of the thermal collector 4. The solar powered fluid heating system according assembly 420 is identical to that described above in to claim 2 wherein the solar powered means comprises connection with the thermal collector assembly 390. a turbine driven by refrigerant vapor flowing from the 18 separator means to the first condenser through a portion greater than the density of first refrigerant vapor of the vapor conduit means. and substantially less than the density of the first 5. The solar powered fluid heating system according refrigerant liquid;

to claim 1 wherein the refrigerant pressurizing means means for limiting upward movement of the ball in comprises a pump for receiving liquid refrigerant from the chamber when the chamber is filled with first the first condenser and for directing liquid refrigerant refrigerant liquid; and through a portion of the liquid conduit means. a valve seat for receiving the ball and thereby closing 6. The solar powered fluid heating system according the inlet to the liquid conduit means when the to claim 1 wherein the refrigerant pressurizing means chamber is filled with first refrigerant vapor. comprises a compressor for receiving refrigerant vapor 10 14. The solar powered fluid heating system according from the separator means and for directing pressurized to claim 1 wherein the liquid conduit means includes the refrigerant vapor through a portion of the vapor con first portion extending from the first condenser to the duit means to the first condenser. separator means and a second portion extending from 7. The solar powered fluid heating system according the separator means to the thermal collector so that the to claim 1 wherein the refrigerant pressurizing means 15 separator means is included both in the vapor conduit comprises a pump for receiving liquid refrigerant from means and in the liquid conduit means. the first condenser and for directing pressurized liquid 15. The solar powered fluid heating system according refrigerant through a portion of the liquid conduit to claim 14 further including solar powered means for means and a motor for driving the pump, and further actuating the refrigerant pressurizing means. including a plurality of photovoltaic cells and means 16. The solar powered fluid heating system according connecting the output of the photovoltaic cells to the 20 to claim 15 wherein the refrigerant pressurizing means motor for driving the pump. comprises a pump and a motor for driving the pump, 8. The solar powered fluid heating system according and wherein the solar powered means for actuating the to claim 1 wherein the refrigerant pressurizing means refrigerant pressurizing means comprises a plurality of comprises a pump for receiving liquid refrigerant from photovoltaic cells and means connecting the output of the first condenser and for directing pressurized liquid 25 the photovoltaic cells to the motor for driving the refrigerant through a portion of the liquid conduit pump.

means and a motor for driving the pump, and further 17. The solar powered fluid heating system according including a turbine driven by refrigerant vapor flowing to claim 15 wherein the refrigerant pressurizing means through the vapor conduit means from the separator comprises a pump and a motor for driving the pump and means to the first condenser, a generator driven by the 30 wherein the solar powered means for actuating the turbine, and means connecting the output of the genera refrigerant pressurizing means comprises a turbine tor to the motor for driving the pump. driven by refrigerant vapor flowing through the vapor 9. The solar powered fluid heating system according conduit means from the separator means to the first to claim 1 wherein the refrigerant pressurizing means condenser, a generator driven by the turbine, and means comprises a pump for receiving liquid refrigerant from connecting the output of the generator to the motor for a first condenser and for directing pressurized liquid 35 driving the pump, refrigerant through a portion of the liquid conduit 18. The solar powered fluid heating system according means and a motor for driving the pump, and further to claim 15 wherein the refrigerant pressurizing means including a plurality of photovoltaic cells, a turbine comprises a pump and a motor for driving the pump and driven by refrigerant vapor flowing through the vapor wherein the solar powered means for actuating the conduit means from the separator means to the first refrigerant pressurizing means comprises a plurality of condenser, a generator driven by the turbine, and means photovoltaic cells, a turbine driven by refrigerant vapor connecting the output of the photovoltaic cells and the flowing through the vapor conduit means from the generator to the motor for driving the pump. separator means to the first condenser, a generator 10. The solar powered fluid heating system according driven by the turbine, and means connecting the outputs to claim 1 wherein the refrigerant pressurizing means 45 of the photovoltaic cells and the generator to the motor comprises a compressor for receiving refrigerant vapor for driving the pump.

from the separator means and for directing pressurized refrigerant vapor through a portion of the vapor con to 19. The solar powered fluid heating system according claim 15 wherein the refrigerant pressurizing means duit means to the first condenser and a motor for driv comprises a compressor for receiving refrigerant vapor ing the compressor, and further including the plurality 50 from the separator means and for directing pressurized of photovoltaic cells and means connecting the output refrigerant vapor through a portion of the vapor con of the photovoltaic cells to the motor for driving the duit means to the first condenser and a motor for driv compressor.

11. The solar powered fluid heating system according means for actuating the refrigerant the ing the compressor, and wherein solar powered to claim 1 further including a tank, wherein the fluid to 55 comprises a plurality of photovoltaic cells and means pressurizing be heated comprises a quantity of water contained in the connecting the output of the photovoltaic cells means to the tank, wherein the first condenser is positioned within motor for driving the compressor.

the tank for heating the water contained therein.

12. The solar powered fluid heating system according to20. The solar powered fluid heating system according claim 14 further including a tank, wherein the fluid to to claim 1 further including check valve means for 60 be heated preventing the entry of first refrigerant vapor into the within the comprises tank, wherein a quantity of water contained the first condenser is posi liquid conduit means.

13. The solar powered fluid heating system according tioned within the tank for heating the quantity of water to claim 12 wherein the check valve means comprises: therein.

a closed chamber having an inlet connected to the 65 to 21. The solar powered fluid heating system according claim 14 further including check valve means for outlet of the first condenser and having an outlet preventing the flow of first refrigerant vapor from the connected to the liquid conduit means;

a ball mounted within the chamber and having a first condenser into the k liquid conduit means.

predetermined density which is substantially