CN109237677B - Heat collection-radiation device and refrigerating system thereof - Google Patents
Heat collection-radiation device and refrigerating system thereof Download PDFInfo
- Publication number
- CN109237677B CN109237677B CN201811130130.1A CN201811130130A CN109237677B CN 109237677 B CN109237677 B CN 109237677B CN 201811130130 A CN201811130130 A CN 201811130130A CN 109237677 B CN109237677 B CN 109237677B
- Authority
- CN
- China
- Prior art keywords
- heat
- radiation
- radiating
- collecting
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0014—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using absorption or desorption
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
- F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention belongs to the technical field of renewable energy sources and air conditioners, and discloses a heat collection-radiation device and a refrigeration system thereof. The solar heat collection and radiation device comprises a support and a heat collection and radiation unit, wherein the heat collection and radiation unit comprises a heat collection part and a radiation heat part, the heat collection part comprises a reflector and a heat collection pipe, and the reflector reflects the heat of sunlight and collects the heat on the heat collection pipe for heating; the radiating heat part comprises a cooling pipe and a selective radiating film, and the selective radiating film emits electromagnetic waves to penetrate through the atmospheric window to radiate heat to the outer space, so that the temperature in the cooling pipe is reduced. The invention also discloses a refrigerating system which comprises the heat collection-radiation device, and an absorption refrigerating device and a cold water tank which are respectively connected with the two ends of the heat collection-radiation device, wherein the refrigerating device is driven to refrigerate after the heat collection-radiation device heats in the daytime, and the heat collection-radiation device is utilized to radiate heat to the outer space at night for refrigeration. The invention makes up the defect that the refrigeration effect is poor because sunlight cannot be utilized at night and space radiation is poor at daytime, and realizes the refrigeration process with near-zero energy consumption.
Description
Technical Field
The invention belongs to the technical field of renewable energy sources and air conditioners, and particularly relates to a heat collection-radiation device and a refrigeration system thereof.
Background
At present, the rapid development of new energy and renewable energy is a main target of the current and future development of China, and in the total social energy consumption of China, the building energy consumption accounts for about 1/3, and the air conditioner energy consumption in the building energy consumption is as high as 42%, so that the air conditioner energy consumption accounts for 14% of the total energy consumption of China. Therefore, the research on the energy conservation of the air conditioning system has very important economic benefit and social significance.
The wide space contains infinite energy, the sun is a heat source with the temperature as high as 5800K, the space is a perfect cold source with the temperature of only 3K, and the temperature of the earth is 300K, which is between the sun and the space. The sun heats the earth at every moment, and the earth also radiates heat to the outer space; if the two kinds of energy can be reasonably utilized, the energy consumption of the air conditioner can be greatly reduced. Solar refrigeration technology is developed relatively mature nowadays, and the greatest advantage is that seasonal adaptability is good: on one hand, people have higher requirements on refrigerating capacity in hot summer; on the other hand, the solar radiation intensity is high in summer, and more cold energy can be generated by driving the refrigerating machine by using solar energy. This exactly matches the need of people for air conditioning in summer. The solar refrigerating technology utilizes solar heat collector to produce hot water, which is used to drive absorption refrigerator to work and has the advantages of no pollution to atmosphere, no moving parts, quiet running, etc. But has the problem that the solar energy cannot be used at night.
Although the temperature of the cosmos space is close to absolute zero, the existence of the atmospheric layer prevents ground objects from directly radiating heat to the cosmos space, in a wave band of 8-13 microns, the absorption capacity of water vapor, carbon dioxide and ozone in the atmospheric layer to radiation is very weak, so that the transparency of the atmosphere in the wave band is very high, usually the wave band is called as an "atmospheric window", infrared radiation emitted by objects on the earth at normal temperature can just penetrate through the "atmospheric window" to radiate to the outer space, therefore, a material can be found as a radiator, the emissivity of the material in the wave band of 8-13 microns is close to 1, the reflectivity of the material in other wave bands is close to 1, the radiation emitted by the objects at normal temperature penetrates through the atmospheric layer to radiate to the outer space, and the radiation from the outside is reflected, so that the surface of the objects is reduced to a temperature lower than the environment. Although the space radiation refrigeration can radiate heat to the outer space under the condition of not consuming energy or consuming a small amount of energy, so as to achieve the purpose of refrigeration, the selective radiation material is not ideal enough, so that more solar radiation energy can be absorbed in the daytime, and the space radiation refrigeration effect in the daytime is poor.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a heat collection-radiation device and a refrigeration system thereof, wherein the heat collection-radiation device is structurally designed and distributed for key components of the heat collection-radiation device, a heat radiation part and an auxiliary component refrigeration device, and is matched and connected with the auxiliary component refrigeration device, so that on one hand, the heat collection-radiation device is fully utilized to absorb the energy of sunlight when the sunlight is sufficient, so as to drive the absorption refrigeration device to refrigerate, on the other hand, the temperature of a liquid medium in a cooling pipe in the heat collection-radiation device is reduced by skillfully utilizing the principle that a selective radiation film emits electromagnetic wave radiation heat to the outer space under the condition of insufficient sunlight at night, so that the defect that the refrigeration effect is poor when the sunlight cannot be utilized at night and the outer space radiation at day is mutually compensated, and the refrigeration, therefore, the technical problems of high energy consumption and poor effect of the refrigeration system are solved.
To achieve the above objects, according to one aspect of the present invention, there is provided a heat collecting-radiating apparatus including a support and a heat collecting-radiating unit, wherein,
the bracket is connected with the heat collection-radiation unit and is used for supporting the heat collection-radiation unit; the heat collecting-radiating unit is in a tile shape and comprises a heat collecting part and a radiating part, the heat collecting part rotates around a connecting point of a bracket and the heat collecting-radiating unit, when the heat collecting part faces to sunlight, the heat collecting part works, and when the heat collecting part faces away from the sunlight so that the radiating part faces upwards, the radiating part works;
the heat collecting part comprises a tile-shaped reflector and a heat collecting pipe arranged at the focus of the reflector, and the reflector reflects sunlight heat and collects the heat on the heat collecting pipe, so that a liquid medium in the heat collecting pipe is heated; the radiant heat part is arranged on the back of the heat collection part and comprises a cooling pipe and a selective radiation film, the cooling pipe is arranged on the back of the reflector, the selective radiation film is attached to the surface of the cooling pipe, absorbs the heat of a liquid medium in the cooling pipe and then emits electromagnetic waves with the frequency of 8-13 mu m wave band, and the electromagnetic waves of the wave band penetrate through an atmospheric window to radiate the heat to the outer space, so that the temperature of the liquid medium in the cooling pipe is reduced.
Further preferably, the radiant heat portion further includes a reflective heat-conducting film disposed between the cooling pipe and the selective radiation film, on one hand, the reflective heat-conducting film is used for reflecting external electromagnetic waves to prevent the external electromagnetic waves from conducting heat to the cooling pipe, and on the other hand, the reflective heat-conducting film is coated outside the cooling pipe to increase a contact area between the cooling pipe and the selective radiation film, so that heat conduction between the cooling pipe and the selective radiation film is enhanced.
Further preferably, the radiant heat part further comprises a total-permeability isolating film arranged above the selective radiating film, on one hand, the total-permeability isolating film has high radiation transmittance in a total waveband, and on the other hand, the total-permeability isolating film is used for isolating the radiant heat part from air and reducing convective heat transfer between the air and the selective radiating film.
Further preferably, the selective radiation film is preferably a polytetrafluoroethylene film or a polyester film.
Further preferably, a gap between adjacent cooling pipes, and a gap between the cooling pipe and the reflector are filled with a foaming material for maintaining the temperature of the cooling pipe.
According to another aspect of the present invention, there is provided a refrigeration system comprising the heat collecting-radiating device as described above, and an absorption refrigeration device and a cold water tank respectively connected to both ends of the heat collecting-radiating device, wherein,
in the daytime, the heat collecting-radiating device heats a liquid medium in the heat collecting tube by reflecting sunlight heat, the heated liquid medium circularly flows into the refrigerating device to continuously exchange heat with a working medium in the refrigerating device, so as to drive the refrigerating device, the absorption refrigerating device refrigerates and obtains cooled water, the cooled water flows into the cold water tank, and the outside temperature is reduced through the heat exchange between the cold water tank and the outside, so that the refrigerating process is realized;
at night, the heat collection-radiation device is disconnected from the refrigerating device and is connected with the cold water tank through the cooling pipe, the radiation part in the heat collection-radiation device radiates heat to the outer space to reduce the temperature of liquid media in the cooling pipe so as to reduce the temperature of water in the cold water tank, and the cold water tank exchanges heat with the outside to reduce the outside temperature, so that the refrigerating process is realized.
Further preferably, the absorption refrigeration device comprises a gas-liquid separator, a condenser, a liquid distribution plate, an absorber, an evaporator, a U-shaped pipe, a liquid storage barrel, a solution heat exchanger, a solution heating sleeve and a chord moon-shaped channel thermosiphon solution riser pipe,
the heat collecting-radiating device is connected with the solution heating sleeve and the crescent-shaped channel thermosiphon solution lifting pipe, after the heated liquid medium enters the solution heating sleeve and the crescent-shaped channel thermosiphon solution lifting pipe, the working medium in the crescent-shaped channel thermosiphon solution lifting pipe is heated and boiled and enters the gas-liquid separator, the gas-liquid separator is used for separating the working medium into steam and liquid solution, wherein,
the steam enters the condenser and sequentially passes through the U-shaped pipe, the liquid distribution plate and the evaporator to form refrigerant water, the evaporator is connected with the cold water tank, and the refrigerant water in the evaporator exchanges heat with water in the cold water tank, so that the temperature of the water in the cold water tank is reduced to realize a refrigeration process, and the absorbed heat in the evaporator forms steam to enter the absorber;
and the liquid solution enters the absorber through the solution exchanger, flows out of the absorber after absorbing the water vapor in the absorber, and returns to the crescent-shaped passage thermosiphon solution lifting pipe through the solution exchanger.
Further preferably, the crescent-shaped passage thermosiphon solution riser comprises an inner pipe and an outer pipe, a crescent-shaped passage is formed between the inner pipe and the outer pipe, and the heated liquid medium in the heat collecting pipe flows into the solution heating sleeve and the inner pipe of the solution riser to transfer heat to the working medium in the crescent-shaped passage.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. the solar energy and the space cold source have complementary advantages, the problem that the solar energy cannot be used at night is solved by using the space radiation refrigeration, and the solar absorption refrigeration overcomes the defect of poor effect of the space radiation refrigeration in the daytime, so that the all-weather complementary refrigeration is ensured;
2. the heat collecting part in the heat collecting-radiating device can be used as a solar water heater for heating and providing hot water in winter without cold air except for playing a refrigeration role in summer;
3. the two refrigeration modes adopted by the invention are passive refrigeration modes, and the crescent channel thermosiphon riser pipe is adopted to replace a mechanical pump to obtain a flowing pressure head of the absorption refrigeration system, so that the energy consumption is further reduced, and the refrigeration effect of near zero energy consumption is realized;
4. the energy utilized in the invention comes from solar energy and space ultralow temperature cold sources in nature, the energy consumption is extremely low, the energy consumption of the air conditioner can be greatly reduced, and water is used as a refrigerating working medium, so that the system is clean and pollution-free, can be widely applied to buildings such as residential buildings, schools, office buildings, hospitals, airports and the like, is particularly suitable for hot and dry areas with sufficient sunlight, and can be assisted by electric heating wires in rainy days;
5. the heat collecting-radiating device provided by the invention has strong compatibility with a refrigerating system and low modification cost, can be compatible with a traditional air conditioner and an air energy air conditioner for use, does not need large modification cost, can be used as auxiliary refrigeration for continuous use, and can meet the requirement of hot water in winter of a common family by using hot water generated by the system within one day in winter, thereby filling up the 'blank period' of refrigeration.
Drawings
FIG. 1 is a schematic structural view of a heat collecting-radiating unit constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of a heat collecting-radiating device constructed in accordance with a preferred embodiment of the present invention;
FIG. 3 is an atmospheric spectral transmission curve constructed in accordance with a preferred embodiment of the present invention;
fig. 4 is a schematic view of radiation cooling of a selective radiator constructed in accordance with a preferred embodiment of the present invention;
fig. 5 is a schematic energy diagram of an ideal radiator constructed in accordance with a preferred embodiment of the present invention;
FIG. 6 is a schematic block diagram of a refrigeration system constructed in accordance with a preferred embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a crescent-shaped passage thermosiphon solution riser constructed in accordance with a preferred embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-heat collection-radiation device 2-hot water pump 3-gas-liquid separator 4-condenser 5-liquid distribution plate 6-absorber 7-evaporator 8-pressure reducing valve 9-U-shaped pipe 10-liquid storage barrel 11-solution heat exchanger 12-solution heating sleeve 13-crescent channel thermosiphon solution riser 14-cold water tank 15-water pump 16-capillary network radiation air conditioner 17-cold water pump 18-full permeability isolation film 19-selective radiation film 20-light reflection heat conduction film 21-cooling pipe 22-reflector 23-heat collection pipe 24-inner pipe 25-outer pipe 26-crescent channel
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
FIG. 1 is a schematic view of a structure of a heat collecting radiation unit constructed in accordance with a preferred embodiment of the present invention,
fig. 2 is a schematic structural view of a heat collecting and radiating apparatus constructed in accordance with a preferred embodiment of the present invention, as shown in fig. 1 and 2, a heat collecting and radiating apparatus including a bracket and a heat collecting and radiating unit, wherein,
the bracket is connected with the heat collection radiation unit and used for supporting the heat collection radiation unit; the heat collection radiation unit is in a tile shape and comprises a heat collection part and a radiation part, the heat collection part rotates around a connecting point of the bracket and the heat collection radiation unit, when the heat collection part faces to sunlight, the heat collection part works, and when the heat collection part faces back to the sunlight to enable the radiation part to face upwards, the radiation part works;
the heat collecting part comprises a tile-shaped reflector 22 and a heat collecting pipe 23 arranged at the focus of the reflector, the reflector 22 reflects the heat of the sunlight and collects the heat on the heat collecting pipe 23, so that the liquid medium in the heat collecting pipe is heated;
the radiant heat part is arranged below the heat collecting part and comprises a cooling pipe 21, a selective radiation film 19, a total permeability isolation film 18 and a reflective heat conducting film 20, the cooling pipe 21 is arranged on the back of a reflector 22, the selective radiation film 19 is attached to the surface of the cooling pipe 21, absorbs the heat of the liquid medium in the cooling pipe 21 and then emits electromagnetic waves with the frequency of 8-13 mu m wave band, and the electromagnetic waves of the wave band penetrate through an atmospheric window to radiate the heat to the outer space, so that the temperature of the liquid medium in the cooling pipe is reduced; the reflective heat-conducting film 20 is arranged between the cooling pipe 21 and the selective radiation film 19, and a film with good reflective performance and good ductility is required to be adopted, so that on one hand, the reflective heat-conducting film is used for reflecting external electromagnetic waves to prevent the external electromagnetic waves from conducting heat to the cooling pipe, and on the other hand, the reflective heat-conducting film is coated outside the cooling pipe to increase the contact area between the cooling pipe and the selective radiation film, so that the heat conduction between the cooling pipe and the selective radiation film is enhanced; the total-permeability isolating film is arranged above the selective radiation film and used for partially isolating air from the radiation heat and reducing the convective heat transfer between the air and the selective radiation film; the selective radiation film is preferably a polytetrafluoroethylene film or a polyester film; the gaps between adjacent cooling tubes are filled with a foaming material for maintaining the temperature of the cooling tubes.
FIG. 3 is an atmospheric spectral transmittance curve constructed according to a preferred embodiment of the present invention, as shown in FIG. 3, the atmospheric layer has different transmittances for radiation of different wavelengths, in the regions with higher transmittances, such as 8-13 μm bands, the electromagnetic wave of the band can penetrate the atmospheric layer relatively freely, these regions are referred to as "windows" of the atmosphere in meteorology, and space radiation refrigeration is based on the phenomenon of "windows" of the atmosphere, and the radiation has very high emittance in 8-13 μm bands by using a selective radiation body through radiation heat exchange, and the radiation in other wavelength bands will be totally reflected, and the heat is radiated to the outer space without consuming or consuming a small amount of energy, so as to achieve the purpose of refrigeration. Based on the principle, the heat collection radiation device provided by the invention radiates heat to the outer space by using the selective radiation film to emit electromagnetic waves with the wave band of 8-13 mu m, so that the refrigeration purpose is achieved.
Fig. 4 is a schematic diagram of radiation cooling of a selective radiator constructed according to a preferred embodiment of the present invention, and fig. 5 is a schematic diagram of energy of an ideal radiator constructed according to a preferred embodiment of the present invention, as shown in fig. 4 and 5, in an ideal case, the selective radiator continuously radiates heat to the outer space, and only a small part of the energy of solar radiation is absorbed by the radiator, so that the total result is that the amount of heat radiated by the radiator is larger than the absorbed energy, and the temperature of the radiator is continuously reduced, thereby achieving the purpose of cooling. Space radiation refrigeration can achieve an ideal refrigeration effect at night, but at the present stage, due to the limitation of materials (the reflectivity of sunlight is less than 100% in the daytime), even if the radiation body material has only 0.1% of absorption rate to the sunlight with short wavelength, the absorbed solar radiation energy is enough to offset most of radiation refrigeration capacity, so the space radiation refrigeration effect is not ideal enough in the daytime. Based on the original structure, the invention adopts the combination of the heat collection part and the radiation part, and utilizes the heat of sunlight to generate heat to drive the refrigerating device in the daytime, thereby reducing the temperature to achieve the refrigerating effect, and utilizes the space radiation to reduce the temperature in the cooling pipe at night, thereby achieving the refrigerating effect.
In one embodiment of the present invention, the heat collecting tube 23 is a vacuum tube, the cooling tube 21 is a copper tube, the reflective and heat conductive film 20 is an aluminum foil, the selective radiation film 19 is a polytetrafluoroethylene film, and the total permeability isolation film 18 is an LDPE film.
The heat collecting radiation device comprises an LDPE film, a polytetrafluoroethylene film, an aluminum foil, a copper tube, a groove type reflector and a vacuum tube in sequence from a convex surface to a convex-concave surface. Wherein, the vacuum tube is positioned at the focus of the groove type reflector; the LDPE film has high transmittance at the wave band of 8-13 mu m, so that air is isolated, and the convection heat exchange between the air and the polytetrafluoroethylene film is reduced; the polytetrafluoroethylene film has very high emissivity in a wave band of 8-13 mu m, and radiates heat to the space through an atmospheric window; heat-conducting silicone grease is coated between the polytetrafluoroethylene film and the aluminum foil, so that heat conduction is enhanced, and contact thermal resistance is reduced; the aluminum foil is wrapped on the copper tube in a half way, so that the heat conduction performance of the copper tube and the polytetrafluoroethylene film is enhanced; epoxy resin heat-conducting glue is smeared between the aluminum foil and the copper pipe for fixation, so that the contact thermal resistance is reduced; and the lower part of the copper pipe is filled with a polyurethane foaming material for heat preservation.
Fig. 6 is a schematic structural view of a refrigeration system constructed in accordance with a preferred embodiment of the present invention, and as shown in fig. 6, a refrigeration system using a heat collecting radiation device includes a heat collecting radiation device 1, a crescent channel thermosiphon solution riser tube 13, a gas-liquid separator 3, a condenser 4, a solution heat exchanger 11, a liquid receiver 10, a U-shaped tube 9, an evaporator 7, an absorber 6, a cold water tank 14, and a capillary network radiation air conditioner 16. Fig. 7 is a schematic cross-sectional view of a jacket constructed in accordance with a preferred embodiment of the present invention, and as shown in fig. 7, a crescent moon shaped passage thermosiphon solution riser 13 is nested within a solution heating jacket 12.
The heat collecting pipe on the concave surface of the heat collecting and radiating device 1 is respectively communicated with the solution heating sleeve and the chord crescent-shaped channel thermosiphon solution lifting pipe after passing through the hot water pump to form a heat source water loop.
The crescent-shaped passage thermosiphon solution riser 13, the gas-liquid separator 3, the solution heat exchanger 11, the absorber 6 and the pressure reducing valve 8 form an absorbent loop in the absorption refrigeration system.
The condenser 4 and the U-shaped tube 9 are communicated with the evaporator 7 to form a refrigerant pipeline.
The cooling pipeline on the convex surface of the heat collection radiation device 1 is connected with a cold water tank through a cold water pump to form a coolant water loop.
The heat source water loop, the absorbent loop and the refrigerant pipeline form a solar absorption refrigeration system working in the daytime;
the refrigerant water loop forms a night space radiation refrigerating system.
The crescent-shaped passage thermosiphon solution riser 13 replaces a mechanical pump, so that the energy consumption of the system is reduced.
The solar absorption refrigeration system working in daytime and the space radiation refrigeration system working at night share the same cold water tank, and the cold water tank is communicated with the capillary network radiation air conditioner.
The refrigerating system of the invention has the following working procedures: in the daytime, the concave surface of the heat collecting-radiating device 1 faces upwards, and sunlight is reflected by the concave surface of the heat collecting-radiating device and then is focused on the heat collecting pipe 23. After the normal temperature water in the heat collecting pipe 23 is heated to about 90 ℃, the normal temperature water is divided into two paths and is respectively sent into the sleeve 12 and the crescent channel lifting pipe 13 which are heated along the whole lifting pipe from the bottom through the hot water pump 2, and the two paths are used for simultaneously heating the LiBr dilute solution in the channel from inside to outside. In the riser channel 13, because the closed angle of the crescent channel can naturally form a vaporization core for strengthening the solution boiling, the dilute solution can be easily heated to boiling continuously by the hot water outside the pipe to form two-phase flow, then the dilute solution is lifted to the gas-liquid separator 3 by the driving force generated by the different fluid densities in the liquid storage barrel 10 and the thermosiphon, the separated steam enters the condenser 4 through the partition channel to be condensed into refrigerant water, and the concentration of part of the solution is improved to form concentrated solution. In refrigerant circulation, refrigerant water enters the evaporator 6 through the U-shaped pipe 9 to be evaporated, concentrated solution enters the absorber to absorb the evaporated refrigerant water after passing through the heat exchanger 11, and the absorbed dilute solution enters the liquid storage barrel 10 again to perform circulation operation. At night, the heat collecting-radiating device 1 automatically turns to convex work, and the selective radiator can radiate the heat of the coolant water in the cooling pipe 21 to the space through the atmospheric window, so that cold water with lower temperature is generated. The same set of refrigerant water system is shared by the day mode and the night mode, and the obtained cold water is used for indoor capillary network radiation air conditioners to supply cold for rooms.
In addition, besides refrigeration, the system can also collect solar energy through the concave surface of the groove in winter, and the generated hot water can meet partial heat requirements of users.
The solar absorption refrigeration system working in the daytime and the space radiation refrigeration system working at night share the same cold water tank 14, the cold water tank 14 is communicated with the capillary network radiation air conditioner 16, heat exchange is carried out between the cold water tank and the capillary network radiation air conditioner 16, the capillary network radiation air conditioner 16 carries out heat exchange with the outside, and when the temperature in the cold water tank is reduced, the outside temperature is reduced, so that the refrigeration effect is achieved.
The practical application effect of the present invention will be further described with reference to specific parameters.
In the daytime refrigeration process, table 1 shows specific parameters of part of the structure of the heat collection and radiation device, table 2 shows different parameter values of part of the components measured at a certain moment in the refrigeration device, and the heat load of each heat exchange device and the flow of each working medium can be obtained by calculation according to parameter values in tables 1 and 2, which is shown in table 3.
TABLE 1 Heat collecting and radiating device parameter values
TABLE 2 table of parameter values of components at a certain moment
TABLE 3 values of Performance parameters
In the night refrigeration process, the materials and related parameters used for the convex structure of the heat collecting and radiating device are shown in tables 4 and 5, respectively.
TABLE 4 Selective radiation trough related materials
TABLE 5 Selective radiation trough related parameters
When the refrigerating capacity at night is calculated, the temperature of the black body is set to be 300K, the space temperature is set to be 0K, the radiation power of the black body per unit area can be approximately calculated according to the Stefin law,
Pgeneral assembly＝αT4＝5.67×108×3004W/m2＝459.27W/m2
Since the emissivity of the selective radiator at the wavelength of 8-13 μm is 1, and the emissivity of the rest wavelengths is 0, the integral of the band can obtain:
the temperature of the high atmosphere (stratosphere) is 220K, so the amount of radiation absorbed by the selective radiator into the atmosphere is:
the net refrigerating capacity is obtained by subtracting the two,
Pmedicine for treating rheumatism＝147.9W/m2-27.4W/m2＝120.5W/m2
Namely, the refrigerating capacity of the night selective radiator per unit area is 120.5W/m under the ideal state2. After various cold losses are considered, the experimentally measured refrigerating capacity is 74.5W/m2Therefore, the refrigeration system provided by the invention has excellent refrigeration effect and is close to the refrigeration capacity calculated theoretically.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (8)
1. A heat-collecting-radiating device comprising a support and a heat-collecting-radiating unit,
the bracket is connected with the heat collection-radiation unit and is used for supporting the heat collection-radiation unit; the heat collecting-radiating unit is in a tile shape and comprises a heat collecting part and a radiating part, the heat collecting part rotates around a connecting point of a bracket and the heat collecting-radiating unit, when the heat collecting part faces to sunlight, the heat collecting part works, and when the heat collecting part faces away from the sunlight so that the radiating part faces upwards, the radiating part works;
the heat collecting part comprises a tile-shaped reflecting mirror (22) and a heat collecting pipe (23) arranged at the focus of the reflecting mirror, and the reflecting mirror reflects sunlight heat and collects the heat on the heat collecting pipe, so that a liquid medium in the heat collecting pipe is heated; the radiant heat part is arranged on the back of the heat collection part and comprises a cooling pipe (21) and a selective radiation film (19), the cooling pipe is arranged on the back of the reflector, the selective radiation film (19) is attached to the surface of the cooling pipe, absorbs the heat of a liquid medium in the cooling pipe and then emits electromagnetic waves with the frequency of 8-13 mu m wave band, and the electromagnetic waves of the wave band penetrate through an atmospheric window to radiate the heat to the outer space, so that the temperature of the liquid medium in the cooling pipe (21) is reduced.
2. The heat-collecting and radiating device as claimed in claim 1, wherein the radiating portion further comprises a reflective heat-conducting film (20) disposed between the cooling pipe and the selective radiating film for reflecting the electromagnetic waves from the outside to prevent the heat from being conducted from the outside to the cooling pipe, and for increasing the contact area between the cooling pipe and the selective radiating film by covering the outside of the cooling pipe, thereby increasing the heat conduction between the cooling pipe and the selective radiating film.
3. A heat-collecting-radiating device as claimed in claim 1 or 2, wherein the radiating heat portion further comprises a total-permeability separating membrane (18) disposed above the selective radiating membrane, for separating the radiating heat portion from air to reduce the convective heat transfer between the air and the selective radiating membrane, on the one hand, with high radiation transmittance in the total wavelength band.
4. A heat-collecting-radiating device, according to claim 1, characterized in that said selective radiating membrane (19) is made of teflon or mylar.
5. A heat-collecting and radiating device as claimed in claim 1, wherein the gaps between adjacent cooling tubes (21) and between the cooling tubes and the reflector (22) are filled with a foaming material for maintaining the temperature of the cooling tubes.
6. A refrigeration system comprising a heat-collecting radiation device as claimed in any one of claims 1 to 5, and an absorption refrigeration device and a cold water tank (14) connected to both ends of the heat-collecting radiation device, respectively,
in daytime, the heat collecting-radiating device heats a liquid medium in a heat collecting pipe (23) by reflecting sunlight heat, the heated liquid medium circularly flows into the refrigerating device to continuously exchange heat with a working medium in the refrigerating device, so as to drive the refrigerating device, the absorption refrigerating device refrigerates and obtains cooled water, the cooled water flows into the cold water tank, and the outside temperature is reduced by the heat exchange between the cold water tank (14) and the outside, so that the refrigerating process is realized;
at night, the heat collection-radiation device is disconnected from the refrigerating device and is connected with the cold water tank (14) through the cooling pipe (21), the radiation part in the heat collection-radiation device radiates heat to the outer space to reduce the temperature of a liquid medium in the cooling pipe so as to reduce the temperature of water in the cold water tank, and the cold water tank exchanges heat with the outside to reduce the outside temperature, so that the refrigerating process is realized.
7. A refrigeration system as claimed in claim 6, characterized in that the absorption refrigeration unit comprises a gas-liquid separator (3), a condenser (4), a liquid distribution plate (5), an absorber (6), an evaporator (7), a U-shaped tube (9), a liquid storage tank (10), a solution heat exchanger (11), a solution heating sleeve (12) and a crescent channel thermosiphon solution riser tube (13),
the heat collection-radiation device (1) is connected with the solution heating sleeve (12) and the crescent channel thermosiphon solution lifting pipe (13), after the heated liquid medium enters the solution heating sleeve (12) and the crescent channel thermosiphon solution lifting pipe (13), the working medium in the crescent channel thermosiphon solution lifting pipe (13) is heated and boiled and enters the gas-liquid separator (3) which is used for separating the working medium into steam and liquid solution, wherein,
the steam enters the condenser and sequentially passes through the U-shaped pipe (9), the liquid distribution plate (5) and the evaporator (7) to form refrigerant water, the evaporator is connected with the cold water tank (14), the refrigerant water in the evaporator and the water in the cold water tank (14) are subjected to heat exchange, on one hand, the temperature of the water in the cold water tank is reduced to realize a refrigeration process, and on the other hand, the heat absorbed in the evaporator forms steam which enters the absorber;
the liquid solution enters the absorber through the solution heat exchanger (11), flows out of the absorber after absorbing water vapor in the absorber, and returns to the crescent-shaped passage thermosiphon solution lifting pipe (13) through the solution heat exchanger.
8. The refrigeration system as claimed in claim 7, wherein said crescent shaped passage thermosiphon solution riser comprises an inner tube (24) and an outer tube (25) forming a crescent shaped passage (26) therebetween, said liquid medium heated in said collector tube (23) flowing into the solution heating jacket (12) and the solution riser inner tube (24) transferring heat to the working medium in said crescent shaped passage (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811130130.1A CN109237677B (en) | 2018-09-27 | 2018-09-27 | Heat collection-radiation device and refrigerating system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811130130.1A CN109237677B (en) | 2018-09-27 | 2018-09-27 | Heat collection-radiation device and refrigerating system thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109237677A CN109237677A (en) | 2019-01-18 |
| CN109237677B true CN109237677B (en) | 2020-06-30 |
Family
ID=65057008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811130130.1A Active CN109237677B (en) | 2018-09-27 | 2018-09-27 | Heat collection-radiation device and refrigerating system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109237677B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714938A (en) * | 2019-02-28 | 2019-05-03 | 威海云山科技有限公司 | A kind of radiant heat transfer radiator |
| CN109945363B (en) * | 2019-03-21 | 2021-01-12 | 齐鲁工业大学 | Radiation refrigeration system with temperature adaptability and regulation and control method |
| CN110274397B (en) * | 2019-06-13 | 2020-09-11 | 河南五方合创建筑设计有限公司 | Cylindrical tile with refrigerating and heat collecting capabilities and solar tile roof system |
| CN110608548B (en) * | 2019-10-21 | 2024-04-23 | 浙江耀伏能源管理有限公司 | Flat plate type ground space radiation cooler with air flow passage |
| CN111811161B (en) * | 2020-07-13 | 2021-05-07 | 湖南大学 | Cold and heat combined collecting and storing device and method based on advanced sky radiation |
| CN112361645B (en) * | 2020-11-05 | 2021-10-26 | 中国科学院广州能源研究所 | Solar energy utilization and radiation refrigeration combined system |
| CN112523303B (en) * | 2020-12-01 | 2021-12-17 | 南京大学 | Novel air water taking device and application thereof |
| CN112524721B (en) * | 2020-12-18 | 2022-02-08 | 南京工业大学 | Novel passive energy storage type air conditioning system |
| CN113587458B (en) * | 2021-06-16 | 2022-09-06 | 东南大学 | Device capable of simultaneously obtaining heat source from sun and cold source from deep space |
| CN113531921A (en) * | 2021-08-17 | 2021-10-22 | 苏州大学 | Reverse difference light path light and heat multiplexing device based on sub-bands |
| CN113899109B (en) * | 2021-11-16 | 2023-02-07 | 南京索乐优节能科技有限公司 | Efficient integrated system for medium-temperature heating and sky radiation refrigeration by utilizing solar radiation |
| CN115264992A (en) * | 2022-05-27 | 2022-11-01 | 东南大学 | Heat collection refrigeration plate capable of automatically adjusting heat radiation emission and reception and heat flow rectifier |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494818C (en) * | 2003-04-15 | 2009-06-03 | 北京环能海臣科技有限公司 | Solar energy heat energy lithium bromide absorption type central air conditioner with seawater desalination device |
| EP2169331A3 (en) * | 2008-09-30 | 2010-07-28 | Aeteba GmbH | Solar cooling unit |
| DE102009022059A1 (en) * | 2009-05-20 | 2010-11-25 | Schott Solar Ag | Radiation-selective absorber coating and absorber tube with radiation-selective absorber coating |
| CN102207344A (en) * | 2011-03-17 | 2011-10-05 | 王珏 | Bimirror focusing solar refrigeration device |
| CN103776196B (en) * | 2014-02-25 | 2016-03-30 | 中国科学技术大学 | A kind of solar energy heating and radiation refrigeration integrated application device |
| CN205070939U (en) * | 2015-11-03 | 2016-03-02 | 广东五星太阳能股份有限公司 | Device is used multipurposely to plate photovoltaic light and heat with nocturnal radiation function of refrigerating |
| CN205174878U (en) * | 2015-11-03 | 2016-04-20 | 广东五星太阳能股份有限公司 | Collecting and distributing calorimeter of compound parabolic spotlight with daytime thermal -arrest and nocturnal radiation refrigeration function |
| WO2017151514A1 (en) * | 2016-02-29 | 2017-09-08 | The Regents Of The University Of Colorado, A Body Corporate | Radiative cooling structures and systems |
| CN205897607U (en) * | 2016-07-01 | 2017-01-18 | 中国科学技术大学 | Novel solar energy refrigerator |
| CN106524358B (en) * | 2016-12-07 | 2022-07-15 | 中国科学技术大学 | Solar photovoltaic power generation-radiation refrigeration integrated device |
-
2018
- 2018-09-27 CN CN201811130130.1A patent/CN109237677B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109237677A (en) | 2019-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109237677B (en) | Heat collection-radiation device and refrigerating system thereof | |
| CN103287014B (en) | Selective absorption emission composite material meeting requirements of solar heat collection and radiation refrigeration | |
| CN210154106U (en) | Heat pipe photovoltaic photo-thermal system based on double condensers | |
| WO2021249576A1 (en) | Solar energy utilization and radiative cooling composite system | |
| CN110274397B (en) | Cylindrical tile with refrigerating and heat collecting capabilities and solar tile roof system | |
| CN111811161B (en) | Cold and heat combined collecting and storing device and method based on advanced sky radiation | |
| Hu et al. | An all-day cooling system that combines solar absorption chiller and radiative cooling | |
| US11085668B2 (en) | Solar energy utilization system | |
| US4270359A (en) | Solar heating system | |
| CN109631416B (en) | Water-gas dual-purpose flat-plate solar heat collection and radiation refrigeration comprehensive utilization device | |
| Serag-Eldin | Thermal design of a roof-mounted CLFR collection system for a desert absorption chiller | |
| CN109945512A (en) | A kind of efficient photovoltaic and photothermal integrated system | |
| CN113503598A (en) | Active and passive phase change heat storage heat collection wall system | |
| Tsoutsou et al. | Building integration of concentrating solar systems for heating applications | |
| US20130340431A1 (en) | Method and apparatus for collecting solar thermal energy | |
| CN207230959U (en) | Air source heat pump equipped with solar energy heating structure | |
| CN109737612B (en) | Infrared radiation air conditioner | |
| Yan et al. | A review of radiative sky cooling technology and its application in building systems | |
| CN206222754U (en) | A kind of double-resource integrated efficient heat-collecting evaporator | |
| CN208238299U (en) | A kind of air source heat pump based on selective transmission greenhouse effects | |
| CN115949986B (en) | Solar-driven heating curtain wall system for summer heat and winter | |
| CN221055160U (en) | Heating and cooling composite system | |
| CN110017621A (en) | Novel across season solar heat-preservation heat supply heating refrigeration electricity generation system | |
| CN207230998U (en) | A kind of air source heat pump | |
| CN202973392U (en) | Solar air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |