CN101344345A - Compression-absorption-diffusion combined refrigerating plant and its refrigeration cycle method - Google Patents
Compression-absorption-diffusion combined refrigerating plant and its refrigeration cycle method Download PDFInfo
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- CN101344345A CN101344345A CNA2008100218148A CN200810021814A CN101344345A CN 101344345 A CN101344345 A CN 101344345A CN A2008100218148 A CNA2008100218148 A CN A2008100218148A CN 200810021814 A CN200810021814 A CN 200810021814A CN 101344345 A CN101344345 A CN 101344345A
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Abstract
The invention provides a compression-absorption-diffusion composite refrigeration device and a refrigeration circulation method which adopts the device, while the device and the method belong to the technical field of refrigeration devices. The device is coupled in a series connected way by an absorption refrigeration system, a compression refrigeration system and a diffusion refrigeration system and is composed of a common heat exchange device, a throttling device and a refrigeration working medium; and the device comprises a liquid storage device, a solution pump, a generator, a rectifier, a first-stage condenser, a second-stage condenser, a compressor, a throttle valve, an evaporator and an absorber. Ammonia vapor completes first pressure increase in the diffusion refrigeration system and the absorption refrigeration system and enters the compressor through a pipeline after entering the first-stage condenser for completing second pressure increase, after that, the ammonia vapor enters the second-stage condenser to be cooled to liquid ammonia, the liquid ammonia enters the evaporator through the throttle valve, the evaporation and the refrigeration are carried out under the role of a diffusing agent of the evaporator, the liquid ammonia is further mixed with the diffusing agent to enter the absorber, ammonia in the absorber is absorbed, and the diffusing agent is returned back to the evaporator along the pipeline. The device of the invention is applicable to small-scale low-grade waste heat refrigeration occasions.
Description
Technical field
The invention belongs to technical field of refrigeration equipment, be specifically related to a kind of compression-absorption-diffusion combined refrigerating plant and refrigerating and circulating method thereof.
Background technology
Refrigeration modes commonly used at present is a freezing by change of state, and the essence of freezing by change of state is exactly: obtain a relatively high pressure and a relatively low pressure, make gaseous working medium in relatively high pressure (condenser) liquefaction heat release down, the liquid refrigerant that condensation is got off again can be in relatively low pressure (evaporimeter) vaporization heat absorption down.The refrigeration modes that refrigeration plant commonly used adopts on the market can be divided into compression refrigeration, absorption refrigeration, ejector refrigeration and diffusion and freezes etc. according to the technological means that realizes relatively low pressure and high pressure is different.These several refrigeration modes differ from one another, wherein most widely used is compression refrigeration, promptly utilize compressor to obtain relatively high pressure and relatively low pressure, efficient height, equal refrigerating capacity lower volume are little, but shortcoming is to energy grade requirement height, generally need to keep operation, can't adopt low-grade waste heat to drive by consumed power or power merit.Absorption refrigeration is to utilize generator and absorber to replace compressor, and efficient is low than compression refrigeration, but it can utilize the lower heat energy of grade to freeze.Absorption refrigeration is again according to absorbing working medium to difference, be divided into lithium bromide absorption refrigeration and ammoniacal liquor absorption refrigeration, lithium bromide absorption refrigeration is because the latent heat of vaporization of refrigeration working medium water is less relatively, and volume is bigger, is fit to be applied to large-scale central air-conditioning refrigeration and some are to the hard-core occasion of volume; And in the ammoniacal liquor absorbent refrigeration system, pressure reduction is bigger between high pressure and the low pressure, ammoniacal liquor need overcome bigger pressure head from being in low-pressure absorber to the generator that is in high pressure, need a high-pressure solution pump (volume is bigger), cause it can't be applied to small-sized refrigerating, with respect to lithium bromide refrigerating, it is had relatively high expectations to waste heat supply temperature in addition, can't reclaim the lower waste heat of grade.The diffusion refrigeration mainly is on the basis of ammoniacal liquor absorption refrigeration, introduce diffusion gas, be implemented under the less state of total system pressure reduction, utilize in the different refrigeration parts refrigeration working medium concentration different and then realize that the partial pressure difference keeps relatively high pressure (condenser) and relatively low pressure (evaporimeter), it does not need solution pump, volume is less, but the circulation of diffusion gas can consume effective refrigerating capacity simultaneously, and efficient is lower than absorption refrigeration.Ejector refrigeration utilizes the steam injection refrigeration working medium of generator, obtains relatively high pressure and relatively low pressure, and its efficient is low, high to the heat source temperature requirement, and noise is bigger during work.
With the growth of world population, energy-consuming increases day by day, and the mankind are faced with severe energy crisis; Another aspect, increasing to the demand of refrigeration product with the raising of people's living standard, refrigeration plant has consumed a large amount of energy, and development low grade residual heat Refrigeration Technique is alleviating energy crisis effectively.Aspect the low grade residual heat refrigeration, single conventional refrigeration modes, be difficult to meet the demands, generally can adopt multiple mode compound-refrigerating, as the Du Kai of Southeast China University, " ammoniacal liquor absorbs and compression combined cooling cycle system and refrigerating and circulating method " (patent No. is 200710022954.2) of people such as Zhang Xiaosong application proposed a kind of cooling cycle system that absorption system and compressibility is carried out series coupled, it can efficiently move under the lower waste heat source of grade, but this system still need adopt the high-pressure solution pump, be fit to use and large-scale refrigerating system, or and comparatively strict occasion use is restricted to volume requirement at some small-type refrigeration appliances.
Up to the present, do not see the refrigeration plant that small-sized low grade residual heat drives on the market as yet.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, compression-absorption-diffusion combined refrigerating plant is provided and adopts the refrigerating and circulating method of this device, realize the miniaturization of low grade residual heat refrigeration plant, and guaranteed the efficient operation of equipment, enlarge the UTILIZATION OF VESIDUAL HEAT IN scope, reach the purpose that reduces power consumption.
A kind of compression-absorption-diffusion combined refrigerating plant provided by the present invention, with ammonia-water is that working medium is right, with hydrogen or helium is diffusant, it is characterized in that: this device is by absorbent refrigeration system, compression refrigerating system, diffusion refrigeration system series coupled, and shared heat transmission equipment, throttle device and refrigeration working medium constitute; This device specifically contains reservoir (1), solution pump (2), solution heat exchanger (3), generator (4), rectifier (5), first-stage condenser (6), compressor (7), secondary condenser (8), cold-producing medium choke valve (9), evaporimeter (10), the absorber (12) that is communicated with successively with pipeline; Be provided with circulation line through solution heat exchanger (3) between generator (4) and absorber (12), this circulation line is used for the backflow of weak aqua ammonia, is provided with solution choke valve (13) in this circulation line; Be provided with circulation line through gas heat-exchanger (11) between absorber (12) and evaporimeter (10), this circulation line is used for the backflow of diffusant, is provided with gas diffusion pump (14) in this circulation line; Described absorbent refrigeration system is by reservoir (1), solution pump (2), generator (4), rectifier (5), one, secondary condenser (6,8), cold-producing medium choke valve (9), evaporimeter (10), absorber (12) is formed, described compression refrigerating system is by compressor (7), first-stage condenser (6), secondary condenser (8), cold-producing medium choke valve (9) and evaporimeter (10) are formed, and described diffusion refrigeration system is by reservoir (1), generator (4), rectifier (5), evaporimeter (10), absorber (12), circulation line between gas circulator (14) and absorber (12) and the evaporimeter (10) is formed.
Above-mentioned compression-absorption-diffusion combined refrigerating plant, the refrigerating and circulating method that is adopted is: the concentrated ammonia solution that reservoir comes out obtains certain power by solution pump, under it promotes, concentrated ammonia solution at first enters is that the dilute ammonia solution of solution heat exchanger and backflow carries out heat exchange, enter generator through the preheating ammonia spirit, ebuillition of heated produces the ammonia steam and enters rectifier in generator, and the remaining dilute ammonia solution circulation line between generator and absorber in ammonia evaporation back is got back in the absorber through solution heat exchanger and solution choke valve; The ammonia steam is after rectifier rectifying, ammonia vapor quality mark further improves, obtain approaching pure component HTHP ammonia steam and enter first-stage condenser, once cool off, then enter compressor, the pressure sensor device that is arranged on this moment in the first-stage condenser can detect the pressure of this moment, if pressure is lower than condensing pressure, then compressor is opened the ammonia steam is carried out the secondary pressurization; When pressure meets the demands constantly, split-compressor can keep stopped status, the ammonia steam that satisfies the pressure requirement enters secondary condenser, and in secondary condenser, the ammonia steam is condensed into ammoniacal liquor, ammoniacal liquor enters evaporimeter behind the cold-producing medium choke valve, be the mist of ammonia and diffusant in evaporimeter, the concentration of diffusant is higher, and the partial pressure of ammonia is lower than its saturation pressure, ammoniacal liquor evaporation ammonification steam, this process heat absorption reaches the purpose of refrigeration; After the ammoniacal liquor evaporation, in evaporimeter, form and contain the bigger mist of ammonia concentration, mist enters absorber through gas heat exchanger, ammonia wherein is absorbed, and diffusant and unabsorbed ammonia come back to evaporimeter under the effect of gas heat-exchanger at gas circulator along the peripheral passage between absorber and the evaporimeter, finish kind of refrigeration cycle.Can utilize low grade residual heat (industrial waste heat, afterheat of IC engine) or solar energy is the shared generator energy supply of described absorbent refrigeration system mechanism and diffusion refrigeration system mechanism.
Beneficial effect of the present invention: (1) this device is compound compression refrigerating system, absorbent refrigeration system, diffusion refrigeration system, realized the combination of power refrigeration with refrigeration heat; Because the existence of compression refrigerating system, diffusion refrigeration system and the required refrigerant vapour pressure that provides of absorbent refrigeration system have reduced, it means and has reduced the requirement of refrigeration system to energy grade, for the utilization of low grade residual heat provide may, on the other hand, before refrigerant vapour enters compressor, through the once pressurization of diffusion refrigeration system, absorbent refrigeration system, the required compression ratio of steam descends, the required consumption of compressor merit reduce, reach the purpose that reduces power consumption.(2) volume is little, and the diffusion gas of refrigeration system has reduced system's pressure reduction, and the system that makes need not to adopt the high-pressure solution pump, has dwindled the refrigeration system overall volume, for recovery automobile engine residual heat, fishing boat tail gas waste heat provide possibility.(3) energy use efficiency height, refrigeration system have demonstrated fully the principle that energy classification utilizes, and driven absorption system, are obtained power merit drive compression system by electric energy by low grade residual heat, make the energy at different levels all be utilized effectively.The absolute throttling of choke valve of the relative throttling of diffusion refrigeration system that (4) this device is compound and absorbent refrigeration system, compression refrigerating system, compare with single diffusion refrigeration, its required diffusant internal circulating load reduces, the thermic load of bringing from absorbent is little, the heat loss of system is also less, compares with single absorbent refrigeration system, the absolute throttling of choke valve of compression refrigerating system, and pressure reduction is less before and after its choke valve, required throttle part volume is less, and choke valve ice berg phenomenon can not occur.(5) applied widely, it can adjust according to different energy resource structures, different energy sources grade characteristics in good time, and is big in the waste heat amount, when temperature is high, compressibility stops automatically, when waste heat deficiency, temperature are low, compressibility will move automatically, guarantee the refrigerating capacity of refrigeration system.(6) cold-producing medium of refrigeration system employing is a natural refrigerant, and ozone layer is had no adverse effects, and does not also have greenhouse effects, is beneficial to the protection of environment.
Description of drawings
Fig. 1 is a compression-absorption-diffusion combined refrigerating plant structural representation of the present invention.
Among the figure: reservoir 1, solution pump 2, solution heat exchanger 3, generator 4, rectifier 5, first-stage condenser 6, compressor 7, secondary condenser 8, cold-producing medium choke valve 9, evaporimeter 10, gas heat exchanger 11, absorber 12, solution choke valve 13, gas circulator 14.
The specific embodiment
Below in conjunction with the drawings and specific embodiments apparatus of the present invention and refrigerating method thereof are described further.
As shown in Figure 1, reservoir 1, solution pump 2, solution heat exchanger 3, generator 4, rectifier 5, first-stage condenser 6, secondary condenser 8, cold-producing medium choke valve 9, evaporimeter 10, absorber 12 are communicated with the pipeline welding of seamless steel pipe or stainless steel material successively, and constitute the peripheral passage from generator 4 bottoms and absorber 12 tops through solution heat exchanger 3 usefulness pipeline UNICOMs, in reservoir 1, add refrigeration working medium ammonia-water has promptly been finished the processing of ammoniacal liquor absorbent refrigeration system mechanism; Between described first-stage condenser 6 and secondary condenser 8, be provided with compressor 7, first-stage condenser 6 outlets link to each other with the air entry of compressor 7, the gas outlet of compressor 7 is connected with the air inlet of secondary condenser 8, and described like this compressor 7 can constitute compressibility with described first-stage condenser 6, secondary condenser 8, cold-producing medium choke valve 9, evaporimeter 10; Absorber 12 tops are communicated with through gas heat exchanger 11 usefulness circulation lines with the top of evaporimeter 10, constitute the peripheral passage, and gas circulator 14 is set, and gas circulator 14 air inlets are connected with absorber, and gas outlet and evaporimeter are to being communicated with; And in equipment, charge into diffusant in the system from evaporimeter, formed the diffusion refrigeration system in conjunction with described reservoir 1, generator 4, rectifier 5, first-stage condenser 6, secondary condenser 9, evaporimeter 10,12 of absorbers.Above-mentioned each parts constitute the compression-absorption-diffusion compound-refrigerating equipment of compression absorption system, diffusion system, compressibility series coupled, shared heat exchange, throttle device and refrigeration working medium.Described compressor 7 is controlled indirectly by the vapor outlet port pressure of first-stage condenser 6, when pressure is higher than the pressure (generally a little more than condensing pressure 10kPa under the local temperature) of required setting, compressor 7 will quit work, when pressure is lower than when pressure is set, compressor will start the steam second-compressed, and the compression ratio of described compressor is between 1.1～1.8.The refrigeration working medium that compression-absorption-diffusion combined refrigerating plant of the present invention adopts to the mass concentration of ammonia-water between 0.25～0.45, the cryogenic temperature that requires is low more, the concentration of selecting is general just low more, the ammoniacal liquor that general refrigeration, freezing refrigeration plant inject selects about 0.29, and general idle call refrigeration system ammonia concn selects about 0.35.The diffusant that compression-absorption-diffusion combined refrigeration plant of the present invention adopts is or that hydrogen be helium, and general refrigerating capacity adopts hydrogen during less than 2.5kW, and during greater than 2.5kW, considers safety problem selection helium; Charge pressure decision when the filling weight of general diffusant is main; when injecting diffusant; should guarantee to answer under the stopped status diffusant pressure at 60～90kPa; refrigeration, the freezing diffusant pressure that needs with refrigeration plant are higher; generally about 85kPa, the idle call diffusant is shut down pressure generally about 65kPa.Described generator 4 places among the thermal source.
The refrigerating and circulating method of compression-absorption-diffusion combined refrigerating plant of the present invention: the concentrated ammonia solution that reservoir comes out obtains certain power by solution pump, under it promotes, concentrated ammonia solution at first enters is that the dilute ammonia solution of solution heat exchanger and backflow carries out heat exchange, enter generator through the preheating ammonia spirit, produce the ammonia steam at generator place ebuillition of heated and enter rectifier, the remaining dilute ammonia solution in ammonia evaporation back is got back in the absorber through solution heat exchanger and solution choke valve along the dilute ammonia solution current return circuit; The ammonia mass fraction of ammonia steam after rectifier rectifying further improves, obtain approaching pure component HTHP ammonia and enter first-stage condenser, once cool off, then enter compressor, the pressure sensor device that is arranged on this moment in the first-stage condenser can detect the pressure of this moment, if pressure is lower than condensing pressure, then compressor is opened the ammonia steam is carried out the secondary pressurization; When pressure meets the demands constantly, split-compressor can keep stopped status, the ammonia steam that satisfies the pressure requirement enters secondary condenser, and in secondary condenser, the ammonia steam is condensed into ammoniacal liquor, ammoniacal liquor enters evaporimeter behind the cold-producing medium choke valve, be the mist of ammonia and diffusant in evaporimeter, the concentration of diffusant is higher, and the partial pressure of ammonia is lower than its saturation pressure, ammoniacal liquor evaporation ammonification steam, this process heat absorption reaches the purpose of refrigeration; After the ammoniacal liquor evaporation, formation contains the bigger mist of ammonia concentration in evaporimeter, and mist enters absorber through gas heat exchanger, and ammonia wherein is absorbed, and diffusant is got back to evaporimeter along the diffusion path under the effect of gas circulator, finish kind of refrigeration cycle.
In the compression-absorption-diffusion combined refrigerating plant of the present invention, rectifier 5, first-stage condenser 6, secondary condenser 8, absorber 12 is the heat release parts, can be equipped with blower fan and it be carried out air-cooled, and also can be equipped with cooling tower carries out water-cooled; Or the cold that evaporimeter 10 produces can be delivered to the destination by the blower fan refrigerating medium.
Compression-absorption-diffusion combined refrigerating plant of the present invention has reduced the requirement to energy grade, and it can utilize 90 ℃ of left sides Right low grade residual heat (industrial waste heat, afterheat of IC engine) or the energy of low energy densities such as solar energy be as described in absorption system and The generator energy supply that diffusion system shares; Utilize electric energy as the energy of the compressor that drives described compressibility. At waste heat supply temperature When higher, it can mainly rely on waste heat to drive; Or when the lower waste heat insufficient total amount of waste heat supply temperature, it can adopt electric energy Replenish, guaranteed the normal operation of system. Compare with existing compression refrigeration, it has reached reduction by the utilization to waste heat The purpose of power consumption; Compare with absorption refrigeration, diffusion refrigeration, its requirement to energy grade is lower, has enlarged UTILIZATION OF VESIDUAL HEAT IN Scope, and with respect to ammonia absorption refrigeration, the compression-absorption-diffusion combined refrigeration system of the present invention need not high-pressure pump, has dwindled body Long-pending; With the diffusion refrigeration system, it has reduced diffusant can amount, has improved efficient relatively. Compression-absorption of the present invention-diffusion Combined refrigeration system has greater advantage in small-sized low grade residual heat utilization.
Claims (3)
1, a kind of compression-absorption diffusion combined refrigerating plant, this device is that working medium is right with ammonia-water, with hydrogen or helium is diffusant, it is characterized in that: this device is by absorbent refrigeration system, compression refrigerating system, diffusion refrigeration system series coupled, and shared heat transmission equipment, throttle device and refrigeration working medium constitute; This device specifically contains reservoir (1), solution pump (2), solution heat exchanger (3), generator (4), rectifier (5), first-stage condenser (6), compressor (7), secondary condenser (8), cold-producing medium choke valve (9), evaporimeter (10), the absorber (12) that is communicated with successively with pipeline; Be provided with circulation line through solution heat exchanger (3) between generator (4) and absorber (12), this circulation line is used for the backflow of weak aqua ammonia, is provided with solution choke valve (13) in this circulation line; Be provided with circulation line through gas heat-exchanger (11) between absorber (12) and evaporimeter (10), this circulation line is used for the backflow of diffusant, is provided with gas diffusion pump (14) in this circulation line; Described absorbent refrigeration system is by reservoir (1), solution pump (2), generator (4), rectifier (5), one, secondary condenser (6,8), cold-producing medium choke valve (9), evaporimeter (10), absorber (12) is formed, described compression refrigerating system is by compressor (7), first-stage condenser (6), secondary condenser (8), cold-producing medium choke valve (9) and evaporimeter (10) are formed, and described diffusion refrigeration system is by reservoir (1), generator (4), rectifier (5), evaporimeter (10), absorber (12), circulation line between gas circulator (14) and absorber (12) and the evaporimeter (10) is formed.
2, the refrigerating and circulating method that compression-absorption-diffusion combined refrigerating plant as claimed in claim 1 adopted is characterized in that this method is specific as follows:
The concentrated ammonia solution that reservoir (1) comes out obtains certain power by solution pump (2), under it promotes, what concentrated ammonia solution at first entered is that solution heat exchanger (3) carries out heat exchange with the dilute ammonia solution that refluxes, enter generator (4) through the preheating ammonia spirit, ebuillition of heated produces the ammonia steam and enters rectifier (5) in generator (4), and the remaining dilute ammonia solution circulation line between generator (4) and absorber (12) in ammonia evaporation back is got back in the absorber (12) through solution heat exchanger (3) and solution choke valve (13); The ammonia steam is after rectifier (5) rectifying, ammonia vapor quality mark further improves, obtain approaching pure component HTHP ammonia steam and enter first-stage condenser (6), once cool off, then enter compressor (7), the pressure sensor device that is arranged on this moment in the first-stage condenser can detect the pressure of this moment, if pressure is lower than condensing pressure, then compressor (7) is opened the ammonia steam is carried out the secondary pressurization; When pressure meets the demands constantly, split-compressor can keep stopped status, the ammonia steam that satisfies the pressure requirement enters secondary condenser (8), and in secondary condenser (8), the ammonia steam is condensed into ammoniacal liquor, ammoniacal liquor enters evaporimeter (10) behind cold-producing medium choke valve (9), be the mist of ammonia and diffusant in evaporimeter, the concentration of diffusant is higher, and the partial pressure of ammonia is lower than its saturation pressure, ammoniacal liquor evaporation ammonification steam, this process heat absorption reaches the purpose of refrigeration; After the ammoniacal liquor evaporation, in evaporimeter, form and contain the bigger mist of ammonia concentration, mist enters absorber (12) through gas heat exchanger (11), ammonia wherein is absorbed, and diffusant and unabsorbed ammonia come back to evaporimeter (10) along the peripheral passage between absorber (12) and the evaporimeter (10) through gas heat-exchanger (11) under the effect of gas circulator (14), finish kind of refrigeration cycle.
3, refrigerating and circulating method as claimed in claim 2 is characterized in that: utilizing low grade residual heat or solar energy is that described absorbent refrigeration system and the shared generator (4) of diffusion refrigeration system provide energy.
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| CN101787908A (en) * | 2010-01-11 | 2010-07-28 | 北京世能中晶能源科技有限公司 | Closed brayton cycle excess heat generating system and method for using same for excess heat power generation |
| CN102141323A (en) * | 2011-03-11 | 2011-08-03 | 北京天际旭能太阳能制冷技术有限公司 | System combining compressor refrigerating and thermal refrigerating |
| CN103906529A (en) * | 2011-03-08 | 2014-07-02 | 阿特伍德移动产品有限责任公司 | Helium charged refrigerator |
| CN104919259A (en) * | 2012-11-26 | 2015-09-16 | 冷王公司 | Auxiliary subcooling circuit for a transport refrigeration system |
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| JP2000018765A (en) * | 1998-06-26 | 2000-01-18 | Matsushita Refrig Co Ltd | Air conditioner |
| CN2498554Y (en) * | 2001-06-12 | 2002-07-03 | 徐应芙 | High-efficiency energy-saving environmental-protection air conditioning fan |
| CN100404976C (en) * | 2006-07-13 | 2008-07-23 | 上海交通大学 | Single alloy compressing-diffusing metal hydride heat pump/refrigerating method and system |
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| CN103906529A (en) * | 2011-03-08 | 2014-07-02 | 阿特伍德移动产品有限责任公司 | Helium charged refrigerator |
| CN102141323A (en) * | 2011-03-11 | 2011-08-03 | 北京天际旭能太阳能制冷技术有限公司 | System combining compressor refrigerating and thermal refrigerating |
| CN104919259A (en) * | 2012-11-26 | 2015-09-16 | 冷王公司 | Auxiliary subcooling circuit for a transport refrigeration system |
| CN104919259B (en) * | 2012-11-26 | 2017-05-10 | 冷王公司 | Auxiliary subcooling circuit for a transport refrigeration system |
| CN106064654B (en) * | 2016-07-19 | 2019-05-28 | 江苏白雪电器股份有限公司 | Direct current drive refrigerator car |
| CN106064654A (en) * | 2016-07-19 | 2016-11-02 | 江苏白雪电器股份有限公司 | Direct current drive refrigerator car |
| CN106403453A (en) * | 2016-11-21 | 2017-02-15 | 成都赛普瑞兴科技有限公司 | Zero discharge type circulating water cooling system |
| CN107192163A (en) * | 2017-07-06 | 2017-09-22 | 华南理工大学 | A kind of semiconductor absorber propagation property refrigerating plant |
| CN107192163B (en) * | 2017-07-06 | 2023-07-18 | 华南理工大学 | Semiconductor-absorption diffusion coupling refrigerating device |
| CN109682115A (en) * | 2017-10-18 | 2019-04-26 | 储碧峰 | The diffusion absorbing hybrid refrigeration device of solar energy-semiconductor driving |
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