US20150068239A1 - Solar cooling system integrated in building envelope - Google Patents
Solar cooling system integrated in building envelope Download PDFInfo
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- US20150068239A1 US20150068239A1 US14/020,845 US201314020845A US2015068239A1 US 20150068239 A1 US20150068239 A1 US 20150068239A1 US 201314020845 A US201314020845 A US 201314020845A US 2015068239 A1 US2015068239 A1 US 2015068239A1
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- chamber
- cooling system
- refrigerant
- absorber
- absorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/007—Machines, plants or systems, using particular sources of energy using solar energy in sorption type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/14—Sorption machines, plants or systems, operating continuously, e.g. absorption type using osmosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B35/00—Boiler-absorbers, i.e. boilers usable for absorption or adsorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/60—Solar heat collectors integrated in fixed constructions, e.g. in buildings
- F24S20/69—Solar heat collectors integrated in fixed constructions, e.g. in buildings in the form of shingles or tiles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/17—Size reduction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/272—Solar heating or cooling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
Definitions
- the present invention relates a solar powered cooling system used in HVAC (Heat Ventilation and Air Conditioning) system of buildings. More particularly, the present invention relates to absorption or adsorption based refrigeration system integrated in the outside envelope of any construction to cool the inside using solar energy.
- HVAC Heating Ventilation and Air Conditioning
- the solar cooling system is made compact so that it can be easily integrated in the building envelope.
- the absorption or adsorption based cooling system uses heat to provide air-conditioning. These are popular air-conditioning systems, wherever waste heat is available (like in process plants, power plants etc.).
- Absorption based chillers mostly use Lithium Bromide (LiBr)-Water system or Water-Ammonia as absorber-refrigerant for absorption cycle.
- Adsorption based chillers usually use Silica Gel-Water or Zeolite-Water as adsorber-refrigerant pair.
- the adsorption/absorption cycle ( FIG. 1 ) is similar to a vapor compression cycle, but instead of a mechanical compressor, the compression of the refrigerant vapor is achieved via adsorption/absorption process.
- the refrigerant enters the evaporator as a saturated liquid.
- the pressure of the evaporator chamber is such that the corresponding saturation temperature of the refrigerant is below the temperature of the region to be cooled.
- the region to be cooled be termed as region C.
- the refrigerant evaporates.
- the latent heat of vaporization is extracted from the region C.
- the extraction of heat of vaporization causes the region C to cool down.
- the refrigerant converts into saturated or super-heated vapor.
- the refrigerant is absorbed in a substance which has high affinity to absorb water (for example, a concentrated solution of LiBr).
- the substance is called an absorbent.
- the absorbent chamber is connected to a Generator chamber. In the Generator chamber, the absorbent is heated from a heat source. The increase in temperature of the absorbent leads to release of the refrigerant.
- the refrigerant is released from the absorbent in the vapor phase at higher pressure than the evaporator.
- the refrigerant then goes to a condenser wherein it is condensed to liquid state by removal of heat.
- the refrigerant comes out of the condenser as a saturated liquid.
- the refrigerant then passes through a throttle valve, which leads to a sudden decrease in the pressure of the refrigerant. Because of this sudden drop in the pressure, a small amount of refrigerant evaporates, and the remaining refrigerant cools down to the saturation temperature associated with the low pressure in the evaporator.
- an adsorption cooling cycle instead of an absorption chamber, the refrigerant is adsorbed in an adsorber. In the Generator chamber, the adsorber is regenerated by heat, which releases the refrigerant.
- the Desorption/Generator (D) is the energy consuming chamber and it consumes heat energy instead of electric energy in compressors.
- the Condenser (Q out ) and Absorber/Adsorber (A) reject heat to environment.
- the Evaporator (Q in ) takes the heat from the occupied space.
- the coefficient of performance (COP) of the system is defined as:
- FIG. 1 In FIG. 1 ,
- the simplified process of absorption is explained in FIG. 2 .
- the absorber has affinity toward the refrigerant and hence the refrigerant in the evaporator chamber evaporates and gets absorbed in the absorber chamber.
- the process of evaporation cools down the evaporator chamber.
- heat is provided to the absorber chamber, due to which the refrigerant gets separated from the absorber. This refrigerant is then replenished in the evaporator chamber using an expansion valve and then the process is repeated.
- adsorption cycle is similar to absorption cycle, the only difference being that instead of liquid absorber, solid adsorber is used to evaporate refrigerant.
- the capacity of absorption chillers is available in various sizes varying from 10 KW to 10,000 KW.
- Numerous conventional chiller companies like York, Trane, Johnson-Control, Thermax etc. have absorption and adsorption chillers in their product range. These chillers typically use waste heat available in process plants and power plants.
- solar energy There have been efforts to power these chillers using solar energy.
- reflectors to concentrate the solar heat to attain the required temperature and energy to power these chillers.
- the usage of such chillers using solar energy is still not cost effective and there have been very limited installations of such systems, especially in residential buildings.
- the main object of the present invention is to provide a miniature version of absorption and adsorption cooling system so that it can be used as a building material.
- Another object of the present invention is to design a passive system which can run solely on the solar energy.
- Yet another object of the present invention is to design building material which can be retrofitted to existing construction, providing cooling using solar energy.
- Yet another object of the present invention is to design the system such that its cooling capacity increases with increase in available solar energy, hence it cools less when solar energy is less and cools more when solar energy is more.
- FIG. 3 is a schematic drawing of the 1 st embodiment of the refrigeration system.
- 301 is the evaporation chamber which is in thermal contact with the region to be cooled (denoted by region C). Let the target temperature of region C be denoted by T c .
- the temperature in chamber 301 denoted by T e should be such that T e ⁇ T c .
- the pressure inside the chamber 301 denoted by P e is determined so that T e is the saturation temperature of the refrigerant in chamber 301 .
- Chamber 301 absorbs heat from region C because of thermal contact between then causing the refrigerant to evaporate. On evaporation, refrigerant absorbs heat.
- Chamber 302 is the absorber chamber containing concentrated absorber, which is capable of absorbing refrigerant vapour. Presence of concentrated absorber also promotes evaporation of the refrigerant in chamber 301 . Evaporated refrigerant from chamber 301 gets absorbed to the absorber in chamber 302 . Absorption of refrigerant is accompanied by release of heat. This heat is removed via cooling tubes 308 . In one embodiment, the fluid in cooling tubes 308 is cooled via capillary evaporation. The diluted absorber is pumped from chamber 302 to chamber 303 using a micro-pump 309 . Chamber 303 is the generator chamber. Dilute absorber in chamber 303 is heated using a heat source. In the embodiment shown in FIG.
- the heat source is sun's radiation.
- the heat source can be waste heat from an internal combustion engine, or waste heat from a chemical or nuclear reaction.
- the pressure in chamber 303 denoted by P g is higher than P e .
- P g is higher than P e .
- the tube bringing the absorber from chamber 303 to chamber 302 is connected to tube 310 , which is filled with a high density liquid, such as mercury to ensure the pressure difference between the chamber 302 and chamber 303 is maintained.
- the desorbed refrigerant in vapour state in chamber 303 flows to chamber 304 , which is called the condenser chamber.
- cooling in chamber 304 is achieved via capillary evaporation of cooling fluid flowing in cooling tubes 307 .
- the condensed refrigerant in chamber 304 at pressure P g passes through a throttle valve 305 to chamber 301 , which is at lower pressure, P e .
- P e pressure
- a small fraction of the refrigerant evaporates, thereby cooling the remaining refrigerant to the temperature T e in the evaporation chamber 301 .
- the above described cycle continues.
- Different chambers of the system are thermally insulated from each other using insulating material 306 (represented in FIG. 4 by broad lines).
- the chamber 310 in FIG. 4 also acts like an insulating region.
- FIG. 4 shows another design of the invention.
- the basic process cycle of this design is the same as the design in FIG. 3 .
- Chamber 101 is the evaporation chamber
- chamber 102 is the absorption chamber
- chamber 103 is the generator chamber
- chamber 104 is the condenser chamber
- 105 is the throttle valve
- 106 is insulation material which is represented in the diagram as thick lines.
- 107 and 108 are cooling tubes for chamber 102 and chamber 104 respectively.
- a reverse osmosis (RO) membrane 109 separates the absorber chamber 102 and the generator chamber 103 .
- the RO membrane allows only the refrigerant to pass through it. When the unit is not in operation, the refrigerant in chamber 103 remains in equilibrium with the refrigerant in chamber 102 .
- RO reverse osmosis
- the high pressure P g in chamber 103 plus the fluid pressure due to gravity is balanced by the osmotic pressure plus P e across the RO membrane 109 because of the lower concentration of absorbent in chamber 102 .
- the absorption chamber 102 is maintained at lower absorbent concentration than the generator chamber 103 in order to trap overhead sun rays.
- the pressure differential will develop across the RO membrane 109 because of which the refrigerant will flow into chamber 103 .
- refrigerant is separated from the absorbent.
- the remaining functioning of this design is similar to one described in FIG. 3 .
- the working conditions (temperature, pressure) of different chambers is similar to the design in FIG. 3 .
- FIG. 5 shows another design of the invention.
- the basic process cycle of this design is the same as the design in FIG. 3 .
- Chamber 201 is the evaporation chamber
- chamber 202 is the absorption chamber
- chamber 203 is the generator chamber
- chamber 204 is the condenser chamber
- 205 is the throttle valve
- 206 is insulation material which is represented in the diagram as thick lines.
- 207 and 208 are cooling tubes for chamber 202 and chamber 204 respectively.
- a reverse osmosis (RO) membrane 209 separates the absorber chamber 202 and the generator chamber 203 .
- the RO membrane allows only the refrigerant to pass through it.
- the absorber in chamber 202 is at slightly lower concentration than in chamber 203 in order to balance the higher pressure in chamber 203 (P g ) with osmotic pressure.
- the design of the system is made such that miniature version of vapor absorption or adsorption cycle is packed in to a small chamber.
- the various possible embodiments of this design are shown in FIGS. 1 , 2 ( a ), 2 ( b ), 2 ( c ), 3 ( a ), 3 ( b ) and 4 .
- FIG. 1 shows the cycle diagram for absorption or adsorption refrigeration system used in this invention.
- FIG. 2 shows the mechanism of absorption/adsorption and regeneration process used in this invention.
- FIG. 3 shows the 1 st embodiment of design and arrangement of absorption based system proposed in this invention.
- FIG. 4 shows the 2 nd embodiment of design and arrangement of absorption based system proposed in this invention.
- FIG. 5 shows the 3 rd embodiment of design and arrangement of absorption based system proposed in this invention.
Abstract
The present invention provides a solar cooling system which is so small in size so that it can be used as a building material. The design based on absorption and adsorption refrigeration cycle has been developed to fulfill this objective. The design has been developed such that the system is completely independent and does not require any other source of energy apart from solar heat. Also an effort is made to design the system so that the cooling capacity is automatically increased or decreased based on available solar heat energy.
Description
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- U.S. Pat. No. 8,479,529
- U.S. Pat. No. 8,353,170
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- U.S. Pat. No. 6,397,625
- U.S. Pat. No. 6,116,039
- U.S. Pat. No. 4,881,376
- The present invention relates a solar powered cooling system used in HVAC (Heat Ventilation and Air Conditioning) system of buildings. More particularly, the present invention relates to absorption or adsorption based refrigeration system integrated in the outside envelope of any construction to cool the inside using solar energy. The solar cooling system is made compact so that it can be easily integrated in the building envelope.
- The absorption or adsorption based cooling system uses heat to provide air-conditioning. These are popular air-conditioning systems, wherever waste heat is available (like in process plants, power plants etc.). Absorption based chillers mostly use Lithium Bromide (LiBr)-Water system or Water-Ammonia as absorber-refrigerant for absorption cycle. Adsorption based chillers usually use Silica Gel-Water or Zeolite-Water as adsorber-refrigerant pair. The adsorption/absorption cycle (
FIG. 1 ) is similar to a vapor compression cycle, but instead of a mechanical compressor, the compression of the refrigerant vapor is achieved via adsorption/absorption process.FIG. 1 illustrates the working of an adsorption/absorption cooling cycle. The refrigerant enters the evaporator as a saturated liquid. The pressure of the evaporator chamber is such that the corresponding saturation temperature of the refrigerant is below the temperature of the region to be cooled. Let the region to be cooled be termed as region C. Inside the evaporator, the refrigerant evaporates. The latent heat of vaporization is extracted from the region C. The extraction of heat of vaporization causes the region C to cool down. After evaporation, the refrigerant converts into saturated or super-heated vapor. In case of absorption cooling system, the refrigerant is absorbed in a substance which has high affinity to absorb water (for example, a concentrated solution of LiBr). The substance is called an absorbent. The absorbent chamber is connected to a Generator chamber. In the Generator chamber, the absorbent is heated from a heat source. The increase in temperature of the absorbent leads to release of the refrigerant. The refrigerant is released from the absorbent in the vapor phase at higher pressure than the evaporator. The refrigerant then goes to a condenser wherein it is condensed to liquid state by removal of heat. The refrigerant comes out of the condenser as a saturated liquid. The refrigerant then passes through a throttle valve, which leads to a sudden decrease in the pressure of the refrigerant. Because of this sudden drop in the pressure, a small amount of refrigerant evaporates, and the remaining refrigerant cools down to the saturation temperature associated with the low pressure in the evaporator. In an adsorption cooling cycle, instead of an absorption chamber, the refrigerant is adsorbed in an adsorber. In the Generator chamber, the adsorber is regenerated by heat, which releases the refrigerant. InFIG. 1 , the Desorption/Generator (D) is the energy consuming chamber and it consumes heat energy instead of electric energy in compressors. The Condenser (Qout) and Absorber/Adsorber (A) reject heat to environment. The Evaporator (Qin) takes the heat from the occupied space. The coefficient of performance (COP) of the system is defined as: -
COP=Q in/Generator(D)heat consumed - In
FIG. 1 , -
- Qin=Heat absorbed by evaporator from the occupied space,
- Absorber=Absorber or Adsorber chamber
- Desorber=Generator chamber taking heat as energy input and separating refrigerant from adsorber/absorber
- Pump=Pump for flow of absorber (Not required in adsorption cycle)
- The simplified process of absorption is explained in
FIG. 2 . The absorber has affinity toward the refrigerant and hence the refrigerant in the evaporator chamber evaporates and gets absorbed in the absorber chamber. The process of evaporation cools down the evaporator chamber. In order to regenerate the absorber and the refrigerant, heat is provided to the absorber chamber, due to which the refrigerant gets separated from the absorber. This refrigerant is then replenished in the evaporator chamber using an expansion valve and then the process is repeated. - The working of adsorption cycle is similar to absorption cycle, the only difference being that instead of liquid absorber, solid adsorber is used to evaporate refrigerant. The capacity of absorption chillers is available in various sizes varying from 10 KW to 10,000 KW. Numerous conventional chiller companies like York, Trane, Johnson-Control, Thermax etc. have absorption and adsorption chillers in their product range. These chillers typically use waste heat available in process plants and power plants. There have been efforts to power these chillers using solar energy. There have been recent innovations related to reflectors to concentrate the solar heat to attain the required temperature and energy to power these chillers. However the usage of such chillers using solar energy is still not cost effective and there have been very limited installations of such systems, especially in residential buildings.
- The main object of the present invention is to provide a miniature version of absorption and adsorption cooling system so that it can be used as a building material.
- Another object of the present invention is to design a passive system which can run solely on the solar energy.
- Yet another object of the present invention is to design building material which can be retrofitted to existing construction, providing cooling using solar energy.
- Yet another object of the present invention is to design the system such that its cooling capacity increases with increase in available solar energy, hence it cools less when solar energy is less and cools more when solar energy is more.
-
FIG. 3 is a schematic drawing of the 1st embodiment of the refrigeration system. 301 is the evaporation chamber which is in thermal contact with the region to be cooled (denoted by region C). Let the target temperature of region C be denoted by Tc. The temperature inchamber 301, denoted by Te should be such that Te<Tc. From the thermodynamic properties of the refrigerant, the pressure inside thechamber 301, denoted by Pe is determined so that Te is the saturation temperature of the refrigerant inchamber 301.Chamber 301 absorbs heat from region C because of thermal contact between then causing the refrigerant to evaporate. On evaporation, refrigerant absorbs heat.Chamber 302 is the absorber chamber containing concentrated absorber, which is capable of absorbing refrigerant vapour. Presence of concentrated absorber also promotes evaporation of the refrigerant inchamber 301. Evaporated refrigerant fromchamber 301 gets absorbed to the absorber inchamber 302. Absorption of refrigerant is accompanied by release of heat. This heat is removed via coolingtubes 308. In one embodiment, the fluid in coolingtubes 308 is cooled via capillary evaporation. The diluted absorber is pumped fromchamber 302 tochamber 303 using amicro-pump 309.Chamber 303 is the generator chamber. Dilute absorber inchamber 303 is heated using a heat source. In the embodiment shown inFIG. 3 , the heat source is sun's radiation. In another embodiment, the heat source can be waste heat from an internal combustion engine, or waste heat from a chemical or nuclear reaction. The pressure inchamber 303, denoted by Pg is higher than Pe. Upon getting heated, refrigerant is released from the absorber and concentrated absorber flows back tochamber 302. The tube bringing the absorber fromchamber 303 tochamber 302 is connected totube 310, which is filled with a high density liquid, such as mercury to ensure the pressure difference between thechamber 302 andchamber 303 is maintained. The desorbed refrigerant in vapour state inchamber 303 flows tochamber 304, which is called the condenser chamber. Inchamber 304, the refrigerant is cooled and condensed. In one embodiment of the invention, cooling inchamber 304 is achieved via capillary evaporation of cooling fluid flowing in coolingtubes 307. The condensed refrigerant inchamber 304 at pressure Pg passes through athrottle valve 305 tochamber 301, which is at lower pressure, Pe. Upon sudden decrease in pressure, a small fraction of the refrigerant evaporates, thereby cooling the remaining refrigerant to the temperature Te in theevaporation chamber 301. Fromchamber 301, the above described cycle continues. Different chambers of the system are thermally insulated from each other using insulating material 306 (represented inFIG. 4 by broad lines). Thechamber 310 inFIG. 4 also acts like an insulating region. -
FIG. 4 shows another design of the invention. The basic process cycle of this design is the same as the design inFIG. 3 .Chamber 101 is the evaporation chamber,chamber 102 is the absorption chamber,chamber 103 is the generator chamber,chamber 104 is the condenser chamber, 105 is the throttle valve, 106 is insulation material which is represented in the diagram as thick lines. 107 and 108 are cooling tubes forchamber 102 andchamber 104 respectively. In this design, a reverse osmosis (RO)membrane 109 separates theabsorber chamber 102 and thegenerator chamber 103. The RO membrane allows only the refrigerant to pass through it. When the unit is not in operation, the refrigerant inchamber 103 remains in equilibrium with the refrigerant inchamber 102. That is, the high pressure Pg inchamber 103 plus the fluid pressure due to gravity is balanced by the osmotic pressure plus Pe across theRO membrane 109 because of the lower concentration of absorbent inchamber 102. Contrary to the traditional absorption based refrigerators, in this design theabsorption chamber 102 is maintained at lower absorbent concentration than thegenerator chamber 103 in order to trap overhead sun rays. During normal operation of the unit, as refrigerant is absorbed inchamber 102, the pressure differential will develop across theRO membrane 109 because of which the refrigerant will flow intochamber 103. Inchamber 103, using heat, refrigerant is separated from the absorbent. The remaining functioning of this design is similar to one described inFIG. 3 . The working conditions (temperature, pressure) of different chambers is similar to the design inFIG. 3 . -
FIG. 5 shows another design of the invention. The basic process cycle of this design is the same as the design inFIG. 3 .Chamber 201 is the evaporation chamber,chamber 202 is the absorption chamber,chamber 203 is the generator chamber, chamber 204 is the condenser chamber, 205 is the throttle valve, 206 is insulation material which is represented in the diagram as thick lines. 207 and 208 are cooling tubes forchamber 202 and chamber 204 respectively. In this design, a reverse osmosis (RO)membrane 209 separates theabsorber chamber 202 and thegenerator chamber 203. The RO membrane allows only the refrigerant to pass through it. Similar to the design inFIG. 3 , the absorber inchamber 202 is at slightly lower concentration than inchamber 203 in order to balance the higher pressure in chamber 203 (Pg) with osmotic pressure. - The design of the system is made such that miniature version of vapor absorption or adsorption cycle is packed in to a small chamber. The various possible embodiments of this design are shown in
FIGS. 1 , 2(a), 2(b), 2(c), 3(a), 3(b) and 4. - In the drawings accompanying the specification,
-
FIG. 1 shows the cycle diagram for absorption or adsorption refrigeration system used in this invention. -
FIG. 2 shows the mechanism of absorption/adsorption and regeneration process used in this invention. -
FIG. 3 shows the 1st embodiment of design and arrangement of absorption based system proposed in this invention. -
FIG. 4 shows the 2nd embodiment of design and arrangement of absorption based system proposed in this invention. -
FIG. 5 shows the 3rd embodiment of design and arrangement of absorption based system proposed in this invention. - Although the description of this invention has been given with reference to a particular embodiment, it is not to be construed in a limiting sense. Many variations and modifications will now occur to those skilled in the art. For a definition of the invention reference is made to the appended claims.
Claims (9)
1. a solar cooling system of miniature size in form of a tile or brick so that it can be used as a building material;
2. an absorption based solar cooling system which meets the requirement of claim (1);
3. an adsorption based solar cooling system which meets the requirement of claim (1);
4. an absorber-based cooling system n claim (1) which uses a high density liquid head to maintain pressure difference between the absorber and the generator chambers instead of a mechanical pump.
5. a solar cooling system of claim (1) with variable capacity and it changes capacity with increase or decrease in available solar energy;
6. an absorption or adsorption based cooling system of claims (2) and (3) in which the refrigerant is cooled in condenser then it is circulated in absorber/adsorber chamber to cool down the absorber/adsorber, then it is again cooled down to close to ambient condition using a second condenser before discharging the refrigerant inside the evaporator chamber;
7. an absorption cooling system of claim (2) which uses reverse osmosis membrane to transport refrigerant;
8. an absorption cooling system of claim (2) which uses capillaries to transport the absorber and refrigerant;
9. an adsorption cooling system of claim (3) which comprises of a rotating adsorber to convert batch process of adsorption cycle in to a continuous cycle:
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US14/020,845 US20150068239A1 (en) | 2013-09-08 | 2013-09-08 | Solar cooling system integrated in building envelope |
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US14/020,845 US20150068239A1 (en) | 2013-09-08 | 2013-09-08 | Solar cooling system integrated in building envelope |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2692483A (en) * | 1951-01-05 | 1954-10-26 | Arthur W Hedlund | Refrigeration unit utilizing solar energy |
US4231772A (en) * | 1978-10-10 | 1980-11-04 | Owens-Illinois, Inc. | Solar powered heat pump construction |
US4441484A (en) * | 1977-10-17 | 1984-04-10 | Leonard Greiner | Chemical heat pump |
US4556049A (en) * | 1979-02-12 | 1985-12-03 | Tchernev Dimiter I | Integrated solar collector |
US4660629A (en) * | 1983-11-28 | 1987-04-28 | Maier Laxhuber Peter | Continuously acting adsorption devices and process for their operation |
US4746437A (en) * | 1984-02-27 | 1988-05-24 | Hitachi, Ltd. | Method and apparatus for concentration aqueous solution and method and apparatus for recovering temperature |
US5535602A (en) * | 1994-02-25 | 1996-07-16 | Samsung Electronics Co., Ltd. | Absorption cooling device |
-
2013
- 2013-09-08 US US14/020,845 patent/US20150068239A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2692483A (en) * | 1951-01-05 | 1954-10-26 | Arthur W Hedlund | Refrigeration unit utilizing solar energy |
US4441484A (en) * | 1977-10-17 | 1984-04-10 | Leonard Greiner | Chemical heat pump |
US4231772A (en) * | 1978-10-10 | 1980-11-04 | Owens-Illinois, Inc. | Solar powered heat pump construction |
US4556049A (en) * | 1979-02-12 | 1985-12-03 | Tchernev Dimiter I | Integrated solar collector |
US4660629A (en) * | 1983-11-28 | 1987-04-28 | Maier Laxhuber Peter | Continuously acting adsorption devices and process for their operation |
US4746437A (en) * | 1984-02-27 | 1988-05-24 | Hitachi, Ltd. | Method and apparatus for concentration aqueous solution and method and apparatus for recovering temperature |
US5535602A (en) * | 1994-02-25 | 1996-07-16 | Samsung Electronics Co., Ltd. | Absorption cooling device |
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