CN1281704C - Accumulation phase-change material, and defrosting system of accumulation type air-source heat pump of using the material - Google Patents
Accumulation phase-change material, and defrosting system of accumulation type air-source heat pump of using the material Download PDFInfo
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- CN1281704C CN1281704C CN 200510009975 CN200510009975A CN1281704C CN 1281704 C CN1281704 C CN 1281704C CN 200510009975 CN200510009975 CN 200510009975 CN 200510009975 A CN200510009975 A CN 200510009975A CN 1281704 C CN1281704 C CN 1281704C
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Abstract
The present invention provides an energy accumulating phase-change material and an energy accumulating type air-source heat pump defrosting system using the material, which relates to the technical field of a refrigerating device (F25). The present invention can solve the problems of poor reliability, poor operating effect, etc. of the existing air-source heat pump hot-gas defrosting. The chemical component of the energy accumulating phase-change material is composed of CaCl2.6H2O and nucleating agents. A third port of an 8 is connected with a first port through a 2 and a 1, and a fourth port of the 8 is connected with one port of a 9 and a port of a 13 through a 7, a 6, a 5, a 4 and a 3; the other port of the 13 is connected with a pipe orifice 14-4 and one port of a 12, and the other port of the 9 is connected with the other port of the 12 and one port of an 11. A pipe orifice 14-5 is connected with one port of a 10, and the other port of the 11 and the other port of the 10 are connected with a second port of the 8. The material in the present invention has the characteristics of good exothermicity and large energy density, and the system of the present invention realizes the conversion among the functions of system heating, energy accumulation from waste heat, energy release and defrosting.
Description
Technical field:
What the present invention relates to is refrigeration equipment (F25) technical field, specifically is a kind of defrosting system of accumulation type air-source heat pump.
Background technology:
At present, there is dual mode in the air source heat pump hot gas defrosting system that generally acknowledges: the one, and the high temperature hot gas of compressor directly enters vaporizer by by-pass line and defrosts; The 2nd, utilize four-way change-over valve, heat pump is moved by heating condition operation becoming cooling condition.But, because in the hot gas defrosting process, the energy that supplies defrosting is supplied with the shortage of heat of defrosting substantially from the wasted work of compressor, causes that thus the suction and discharge pressure change is violent in the defrost process, and is big to the impact of compressor; The quantity of reflux of system refrigerant is big, causes the possibility of liquid hammer to increase; Pressure of inspiration(Pi) is low excessively during the defrosting beginning, low-voltage variation may occur and shut down; Defrosting time is long and make energy loss big; Defrosting effect is poor, and the residual defrosting water of evaporator surface when causing heat supply running to begin, is become thin ice once more, for next time defrosting brings bigger difficulty, in the course of time, vaporizer occurs and freezes and can't move; After defrosting finished, it was poor to recover heating effect, to blows cold wind indoors, and indoor environment was made a big impact etc., thereby caused the air source heat pump operating performance undesirable, operation stability and poor reliability.Existing energy storage phase change material is all very unstable in exothermicity and interconvertibility, also has its energy density too small and can not satisfy the technical requirements that said system is transformed.
Summary of the invention:
The purpose of this invention is to provide a kind of defrosting system of accumulation type air-source heat pump.The shortage of heat of using for defrosting when the present invention can solve existing air source heat pump hot gas defrosting and problems such as the defrosting poor reliability, the energy loss that cause are big, operating performance difference.The chemical ingredients of energy storage phase change material is by CaCl
26H
2O, nucleator are formed CaCl
26H
2The mass percent of O is 95～99%, and the mass percent of nucleator is 1～5%; Use the defrosting system of accumulation type air-source heat pump of above-mentioned materials to comprise compressor 1, gas-liquid separator 2, device for drying and filtering 3, first kapillary 4, check valve 5, second kapillary 6, outdoor heat exchanger 7, four-way change-over valve 8, indoor heat exchanger 9; The output terminal mouth of pipe of compressor 1 connects the first input/output terminal mouth of pipe of four-way change-over valve 8, the input terminus mouth of pipe of compressor 1 connects the output terminal mouth of pipe of gas-liquid separator 2, the input terminus mouth of pipe of gas-liquid separator 2 connects the 3rd input/output terminal mouth of pipe of four-way change-over valve 8, the one end mouth of pipe of the 4th input/output terminal mouth of pipe junction chamber external heat exchanger 7 of four-way change-over valve 8, the other end mouth of pipe of outdoor heat exchanger 7 connects an end mouth of pipe of second kapillary 6; It also comprises first magnetic valve 10, second magnetic valve 11, the 3rd magnetic valve 12, the 4th magnetic valve 13, accumulation of energy interchanger 14; Accumulation of energy interchanger 14 is made up of circular shell 14-1, spiral pipe 14-2, energy storage phase change material 14-3; Energy storage phase change material 14-3 is arranged among the circular shell 14-1, and spiral pipe 14-2 is immersed among the energy storage phase change material 14-3; The other end mouth of pipe of second kapillary 6, the input terminus mouth of pipe of check valve 5 connects an end mouth of pipe of first kapillary 4, the output terminal mouth of pipe of check valve 5, the other end mouth of pipe of first kapillary 4 connects an end mouth of pipe of device for drying and filtering 3, the other end mouth of pipe of device for drying and filtering 3, the one end mouth of pipe of the 4th magnetic valve 13 connects an end mouth of pipe of indoor heat exchanger 9, the other end mouth of pipe of the 4th magnetic valve 13, the one end mouth of pipe of the 3rd magnetic valve 12 connects the end mouth of pipe of spiral pipe 14-2 in the accumulation of energy interchanger 14, the other end mouth of pipe of spiral pipe 14-2 connects an end mouth of pipe of first magnetic valve 10 in the accumulation of energy interchanger 14, the other end mouth of pipe of indoor heat exchanger 9, the other end mouth of pipe of the 3rd magnetic valve 12 connects an end mouth of pipe of second magnetic valve 11, the other end mouth of pipe of second magnetic valve 11, the other end mouth of pipe of first magnetic valve 10 connects the second input/output terminal mouth of pipe of four-way change-over valve 8.Energy storage phase change material among the present invention (2～10 minutes) at short notice has good exothermicity, and has the stable and big characteristics of energy density of phase transformation.Its defrosting system of accumulation type air-source heat pump can realization system heats, energy strorage by using residual heat, release can defrost, the quick conversion between the heat-production functions, the problem of not having external heat source when not only having solved hot gas defrosting, and improved the air source heat pump defrosting characteristic, and has advantage simple in structure, easy to use, easy care.
The actual measurement beneficial effect of defrosting system of accumulation type air-source heat pump is as follows:
1, the accumulation of energy hot gas defrosting time can shorten to 3 minutes, so just can reduce the energy loss in the defrost process;
2, during the accumulation of energy hot gas defrosting, compressor air suction pressure ratio traditional way improves 1 times, so just can avoid existing Defrost mode often to cross the low low-voltage variation halting problem that occurs because of pressure of inspiration(Pi); And the raising of exhaust pressure makes condensing temperature improve again, strengthens the heat transfer temperature difference of defrosting process;
3, during existing defrost system defrosting, the indoor heat exchanger wind pushing temperature is at-2～+ 2 ℃, and when the present invention defrosted, the indoor heat exchanger wind pushing temperature was at 17～22 ℃, the unit problem of blowing a cold wind over when obviously the present invention can avoid defrosting;
When 4, defrosting finishes, outdoor heat exchanger fin surface temperature is higher 5～7 ℃ than traditional defrost system, this is highly beneficial to the defrosting water evaporation stage and the heat and mass transfer process in heat transfer free convection stage, has solved the problem of the residual defrosting water of traditional defrost system outdoor heat exchanger.
Description of drawings:
Fig. 1 is the one-piece construction synoptic diagram of accumulation of energy interchanger 14, Fig. 2 is Figure 1A-A sectional view, Fig. 3 is to use the one-piece construction synoptic diagram of the defrosting system of accumulation type air-source heat pump of energy storage phase change material, Fig. 4 is that the defrosting system of accumulation type air-source heat pump in the embodiment one is in series connection and heats/structural representation during the working order of accumulation of heat, Fig. 5 is that the defrosting system of accumulation type air-source heat pump in the embodiment five is in parallel connection and heats/structural representation during the working order of accumulation of heat, Fig. 6 is the structural representation of the defrosting system of accumulation type air-source heat pump in the embodiment six when being in the working order of complementary energy accumulation of heat, and Fig. 7 is that the defrosting system of accumulation type air-source heat pump in the embodiment seven is in the structural representation when releasing the working order that can defrost.
Embodiment:
Embodiment one: in conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4 present embodiment is described, the chemical ingredients of energy storage phase change material is by CaCl
26H
2O, nucleator are formed CaCl
26H
2The mass percent of O is 95～99%, and the mass percent of nucleator is 1～5%; The chemical ingredients of described nucleator is by Ba (OH)
2, BaSO
4Form; Use the defrosting system of accumulation type air-source heat pump of above-mentioned energy storage phase change material to comprise compressor 1, gas-liquid separator 2, device for drying and filtering 3, first kapillary 4, check valve 5, second kapillary 6, outdoor heat exchanger 7, four-way change-over valve 8, indoor heat exchanger 9; The output terminal mouth of pipe of compressor 1 connects the first input/output terminal mouth of pipe of four-way change-over valve 8, the input terminus mouth of pipe of compressor 1 connects the output terminal mouth of pipe of gas-liquid separator 2, the input terminus mouth of pipe of gas-liquid separator 2 connects the 3rd input/output terminal mouth of pipe of four-way change-over valve 8, the one end mouth of pipe of the 4th input/output terminal mouth of pipe junction chamber external heat exchanger 7 of four-way change-over valve 8, the other end mouth of pipe of outdoor heat exchanger 7 connects an end mouth of pipe of second kapillary 6; It also comprises first magnetic valve 10, second magnetic valve 11, the 3rd magnetic valve 12, the 4th magnetic valve 13, accumulation of energy interchanger 14; Accumulation of energy interchanger 14 is made up of circular shell 14-1, spiral pipe 14-2, energy storage phase change material 14-3; Energy storage phase change material 14-3 is arranged among the circular shell 14-1, and spiral pipe 14-2 is immersed among the energy storage phase change material 14-3; The other end mouth of pipe of second kapillary 6, the input terminus mouth of pipe of check valve 5 connects an end mouth of pipe of first kapillary 4, the output terminal mouth of pipe of check valve 5, the other end mouth of pipe of first kapillary 4 connects an end mouth of pipe of device for drying and filtering 3, the other end mouth of pipe of device for drying and filtering 3, the one end mouth of pipe of the 4th magnetic valve 13 connects an end mouth of pipe of indoor heat exchanger 9, the other end mouth of pipe of the 4th magnetic valve 13, the one end mouth of pipe of the 3rd magnetic valve 12 connects the end mouth of pipe 14-5 of spiral pipe 14-2 in the accumulation of energy interchanger 14, the end mouth of pipe 14-4 of spiral pipe 14-2 connects an end mouth of pipe of first magnetic valve 10 in the accumulation of energy interchanger 14, the other end mouth of pipe of indoor heat exchanger 9, the other end mouth of pipe of the 3rd magnetic valve 12 connects an end mouth of pipe of second magnetic valve 11, the other end mouth of pipe of second magnetic valve 11, the other end mouth of pipe of first magnetic valve 10 connects the second input/output terminal mouth of pipe of four-way change-over valve 8.The refrigeration agent of certain mass is housed in the total system.Above-mentioned defrosting system of accumulation type air-source heat pump is in series connection and heats/the first input/output terminal mouth of pipe and the second input/output terminal mouth of pipe internal communication of (as Fig. 4) four-way change-over valve 8 during the working order of accumulation of heat, the 3rd input/output terminal mouth of pipe of four-way change-over valve 8 and the 4th input/output terminal mouth of pipe internal communication, first magnetic valve, 10 internal communication, second magnetic valve, 11 inner disconnections, the 3rd magnetic valve 12 internal communication, the 4th magnetic valve 13 inner disconnections.
Principle of work: heat in series connection/during the accumulation of heat working order, compressor 1, accumulation of energy interchanger 14, indoor heat exchanger 9, device for drying and filtering 3, first kapillary 4, second kapillary 6, outdoor heat exchanger 7, gas-liquid separator 2, the compressor 1 formation circulation loop that is in series, compressor 1 is delivered to the heat on the outdoor heat exchanger 7 respectively in accumulation of energy interchanger 14 and the indoor heat exchanger 9, makes the energy storage phase change material 14-3 phase-transition heat-storage in the accumulation of energy interchanger 14.
Embodiment two: the difference of present embodiment and embodiment one is CaCl
26H
2The mass percent of O is 96%, and the mass percent of nucleator is 4%.Other composition is identical with embodiment one with annexation.
Embodiment three: the difference of present embodiment and embodiment one is CaCl
26H
2The mass percent of O is 98%, and the mass percent of nucleator is 2%.Other composition is identical with embodiment one with annexation.
Embodiment four: the difference of present embodiment and embodiment one is CaCl
26H
2The mass percent of O is 97%, and the mass percent of nucleator is 3%.Other composition is identical with embodiment one with annexation.
Embodiment five: present embodiment is described in conjunction with Fig. 5, the first input/output terminal mouth of pipe and the second input/output terminal mouth of pipe internal communication of four-way change-over valve 8 when present embodiment and the difference of embodiment one are that defrosting system of accumulation type air-source heat pump is in the working order of in parallel heating/accumulation of heat, the 3rd input/output terminal mouth of pipe of four-way change-over valve 8 and the 4th input/output terminal mouth of pipe internal communication, first magnetic valve, 10 internal communication, second magnetic valve, 11 internal communication, the 12 inner disconnections of the 3rd magnetic valve, the 4th magnetic valve 13 internal communication.Other composition is identical with embodiment one with annexation.
Embodiment six: present embodiment is described in conjunction with Fig. 6, the first input/output terminal mouth of pipe and the second input/output terminal mouth of pipe internal communication of four-way change-over valve 8 when the difference of present embodiment and embodiment one is that defrosting system of accumulation type air-source heat pump is in the working order of complementary energy accumulation of heat, the 3rd input/output terminal mouth of pipe of four-way change-over valve 8 and the 4th input/output terminal mouth of pipe internal communication, first magnetic valve, 10 internal communication, second magnetic valve, 11 inner disconnections, the 12 inner disconnections of the 3rd magnetic valve, the 4th magnetic valve 13 internal communication.Other composition is identical with embodiment one with annexation.Present embodiment can when not needing heat, be directly delivered to this heat in the accumulation of energy interchanger 14 indoor, makes the energy storage phase change material 14-3 phase-transition heat-storage in the accumulation of energy interchanger 14.
Embodiment seven: present embodiment is described in conjunction with Fig. 7, the difference of present embodiment and embodiment one is that defrosting system of accumulation type air-source heat pump is in the first input/output terminal mouth of pipe and the 4th input/output terminal mouth of pipe internal communication of four-way change-over valve 8 when releasing the working order that can defrost, the 3rd input/output terminal mouth of pipe of four-way change-over valve 8 and the second input/output terminal mouth of pipe internal communication, first magnetic valve, 10 internal communication, second magnetic valve, 11 inner disconnections, the 12 inner disconnections of the 3rd magnetic valve, the 4th magnetic valve 13 internal communication.Other composition is identical with embodiment one with annexation.Compressor 1 in the present embodiment, outdoor heat exchanger 7, second kapillary 6, check valve 5, device for drying and filtering 3, accumulation of energy interchanger 14, gas-liquid separator 2, the compressor 1 formation circulation loop that is in series, compressor 1 is delivered to the heat of energy storage phase change material 14-3 in the accumulation of energy interchanger 14 on the outdoor heat exchanger 7, so that outdoor heat exchanger 7 is defrosted.
Claims (10)
1, defrosting system of accumulation type air-source heat pump, it comprises compressor (1), gas-liquid separator (2), device for drying and filtering (3), first kapillary (4), check valve (5), second kapillary (6), outdoor heat exchanger (7), four-way change-over valve (8), indoor heat exchanger (9); The output terminal mouth of pipe of compressor (1) connects the first input/output terminal mouth of pipe of four-way change-over valve (8), the input terminus mouth of pipe of compressor (1) connects the output terminal mouth of pipe of gas-liquid separator (2), the input terminus mouth of pipe of gas-liquid separator (2) connects the 3rd input/output terminal mouth of pipe of four-way change-over valve (8), the one end mouth of pipe of the 4th input/output terminal mouth of pipe junction chamber external heat exchanger (7) of four-way change-over valve (8), the other end mouth of pipe of outdoor heat exchanger (7) connects an end mouth of pipe of second kapillary (6); It is characterized in that it also comprises first magnetic valve (10), second magnetic valve (11), the 3rd magnetic valve (12), the 4th magnetic valve (13), accumulation of energy interchanger (14); Accumulation of energy interchanger (14) is made up of circular shell (14-1), spiral pipe (14-2), energy storage phase change material (14-3); Energy storage phase change material (14-3) is arranged in the circular shell (14-1), and spiral pipe (14-2) is immersed in the energy storage phase change material (14-3); The other end mouth of pipe of second kapillary (6), the input terminus mouth of pipe of check valve (5) connects an end mouth of pipe of first kapillary (4), the output terminal mouth of pipe of check valve (5), the other end mouth of pipe of first kapillary (4) connects an end mouth of pipe of device for drying and filtering (3), the other end mouth of pipe of device for drying and filtering (3), the one end mouth of pipe of the 4th magnetic valve (13) connects an end mouth of pipe of indoor heat exchanger (9), the other end mouth of pipe of the 4th magnetic valve (13), the one end mouth of pipe of the 3rd magnetic valve (12) connects the end mouth of pipe (14-5) of spiral pipe (14-2) in the accumulation of energy interchanger (14), the end mouth of pipe (14-4) of spiral pipe (14-2) connects an end mouth of pipe of first magnetic valve (10) in the accumulation of energy interchanger (14), the other end mouth of pipe of indoor heat exchanger (9), the other end mouth of pipe of the 3rd magnetic valve (12) connects an end mouth of pipe of second magnetic valve (11), the other end mouth of pipe of second magnetic valve (11), the other end mouth of pipe of first magnetic valve (10) connects the second input/output terminal mouth of pipe of four-way change-over valve (8).
2, defrosting system of accumulation type air-source heat pump according to claim 1, it is characterized in that it is in series connection and heats/the first input/output terminal mouth of pipe and the second input/output terminal mouth of pipe internal communication of four-way change-over valve (8) during the working order of accumulation of heat, the 3rd input/output terminal mouth of pipe of four-way change-over valve (8) and the 4th input/output terminal mouth of pipe internal communication, first magnetic valve (10) internal communication, second magnetic valve (11) is inner to be disconnected, the 3rd magnetic valve (12) internal communication, the 4th magnetic valve (13) is inner to be disconnected.
3, defrosting system of accumulation type air-source heat pump according to claim 1, it is characterized in that it is in parallel connection and heats/the first input/output terminal mouth of pipe and the second input/output terminal mouth of pipe internal communication of four-way change-over valve (8) during the working order of accumulation of heat, the 3rd input/output terminal mouth of pipe of four-way change-over valve (8) and the 4th input/output terminal mouth of pipe internal communication, first magnetic valve (10) internal communication, second magnetic valve (11) internal communication, the 3rd magnetic valve (12) is inner to disconnect the 4th magnetic valve (13) internal communication.
4, defrosting system of accumulation type air-source heat pump according to claim 1, the first input/output terminal mouth of pipe and the second input/output terminal mouth of pipe internal communication that it is characterized in that four-way change-over valve (8) when it is in the working order of complementary energy accumulation of heat, the 3rd input/output terminal mouth of pipe of four-way change-over valve (8) and the 4th input/output terminal mouth of pipe internal communication, first magnetic valve (10) internal communication, second magnetic valve (11) is inner to be disconnected, the 3rd magnetic valve (12) is inner to disconnect the 4th magnetic valve (13) internal communication.
5, defrosting system of accumulation type air-source heat pump according to claim 1, it is characterized in that it is in the first input/output terminal mouth of pipe and the 4th input/output terminal mouth of pipe internal communication of four-way change-over valve (8) when releasing the working order that can defrost, the 3rd input/output terminal mouth of pipe of four-way change-over valve (8) and the second input/output terminal mouth of pipe internal communication, first magnetic valve (10) internal communication, second magnetic valve (11) is inner to be disconnected, the 3rd magnetic valve (12) is inner to disconnect the 4th magnetic valve (13) internal communication.
6, defrosting system of accumulation type air-source heat pump according to claim 1, the chemical ingredients that it is characterized in that energy storage phase change material (14-3) is by CaCl
26H
2O, nucleator are formed CaCl
26H
2The mass percent of O is 95～99%, and the mass percent of nucleator is 1～5%.
7, defrosting system of accumulation type air-source heat pump according to claim 6, the chemical ingredients that it is characterized in that nucleator is by Ba (OH)
2, BaSO
4Form.
8, defrosting system of accumulation type air-source heat pump according to claim 6 is characterized in that CaCl
26H
2The mass percent of O is 96%, and the mass percent of nucleator is 4%.
9, defrosting system of accumulation type air-source heat pump according to claim 6 is characterized in that CaCl
26H
2The mass percent of O is 98%, and the mass percent of nucleator is 2%.
10, defrosting system of accumulation type air-source heat pump according to claim 6 is characterized in that CaCl
26H
2The mass percent of O is 97%, and the mass percent of nucleator is 3%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510009975 CN1281704C (en) | 2005-05-12 | 2005-05-12 | Accumulation phase-change material, and defrosting system of accumulation type air-source heat pump of using the material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510009975 CN1281704C (en) | 2005-05-12 | 2005-05-12 | Accumulation phase-change material, and defrosting system of accumulation type air-source heat pump of using the material |
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| CN1281704C true CN1281704C (en) | 2006-10-25 |
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| CN 200510009975 Expired - Fee Related CN1281704C (en) | 2005-05-12 | 2005-05-12 | Accumulation phase-change material, and defrosting system of accumulation type air-source heat pump of using the material |
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| CN100412471C (en) * | 2006-03-30 | 2008-08-20 | 高秀明 | Energy-storing defrosting type cold-warm air conditioning system with liquid-supplemented by air pressure |
| CN100370196C (en) * | 2006-04-05 | 2008-02-20 | 哈尔滨工业大学 | Household heat pump type energy accumulation central air conditioner set |
| CN102003853B (en) * | 2010-12-20 | 2012-06-06 | 哈尔滨工业大学 | Multi-connected unit phase change energy storage hot liquid defrosting system |
| CN102134473A (en) * | 2011-01-18 | 2011-07-27 | 益田润石（北京）化工有限公司 | Calcium chloride hexahydrate phase change energy storage material composition |
| CN102095295B (en) * | 2011-02-24 | 2012-07-04 | 哈尔滨工业大学 | Defrosting detector and defrosting control method based on frost layer thickness |
| CN102620493B (en) * | 2012-04-12 | 2014-05-28 | 东华大学 | Heat pump defrosting system in winter |
| CN104567074B (en) * | 2013-10-28 | 2017-11-14 | 珠海格力电器股份有限公司 | Air-conditioning Cycle device and its control method |
| CN104633871B (en) * | 2013-11-14 | 2017-07-25 | 珠海格力电器股份有限公司 | The control method of air-conditioning system |
| KR101469459B1 (en) * | 2014-07-01 | 2014-12-08 | 주식회사 신진에너텍 | Heat pump system using complex heat sources and its controlling process |
| CN104456736A (en) * | 2014-12-12 | 2015-03-25 | 珠海格力电器股份有限公司 | Air conditioner, heat storage device and control method for air conditioner |
| CN105698450A (en) * | 2016-02-02 | 2016-06-22 | 广东美的制冷设备有限公司 | Air conditioner system and defrosting control method of air conditioner system |
| CN105605841A (en) * | 2016-02-02 | 2016-05-25 | 广东美的制冷设备有限公司 | Air conditioning system and defrosting control method thereof |
| GB201610977D0 (en) * | 2016-06-23 | 2016-08-10 | Sunamp Ltd | A thermal energy storage system |
| CN106490884A (en) * | 2016-10-20 | 2017-03-15 | 湖南野森环保科技有限责任公司 | A kind of hot-air frost removing device of refrigerated display equipment |
| CN107308749B (en) * | 2017-07-21 | 2019-05-21 | 西安交通大学 | Heat accumulating type moving granular bed dust removal filter and its working method |
| CN109489301A (en) * | 2018-11-16 | 2019-03-19 | 珠海格力电器股份有限公司 | Heat pump system and heat pump system control method |
| CN110749004B (en) * | 2019-09-19 | 2021-07-20 | 湖南工程学院 | Fresh air multi-stage processing system for coupling energy storage of soil and phase-change material and operation method |
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