CN108826547B - Direct cooling ice cold-storage air conditioning system - Google Patents
Direct cooling ice cold-storage air conditioning system Download PDFInfo
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- CN108826547B CN108826547B CN201810814338.9A CN201810814338A CN108826547B CN 108826547 B CN108826547 B CN 108826547B CN 201810814338 A CN201810814338 A CN 201810814338A CN 108826547 B CN108826547 B CN 108826547B
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- heat exchange
- ethylene glycol
- evaporator
- tank
- exchange medium
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Classifications
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- 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
- F24F5/0017—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 cold storage bodies, e.g. ice
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses a direct cooling ice storage air conditioning system, which adopts a dual-mode water tank to alternately supply glycol solution and aqueous solution to the heat exchange medium side of an evaporator main unit, a glycol solution circulation loop is established between the heat exchange medium side of the evaporator main unit and an ice storage tank, an aqueous solution circulation loop is established between the heat exchange medium side of the evaporator main unit and water cooling equipment, and another solution circulation loop is established between the ice storage tank and the water cooling equipment. According to the invention, a plate heat exchanger is not required to be additionally arranged under the cooling working condition, high temperature water directly enters the ice storage machine group to release heat, and the COP can be improved by 5% -10%; the water directly enters the evaporator host for heat exchange under the cold supply working condition, so that the resistance link of the transmission and distribution system is reduced, and the transmission and distribution energy consumption is greatly reduced; the transmission and distribution pipeline and the heat exchange link of the air conditioning system are reduced, so that the heat loss in the transmission and distribution process can be reduced; the heat exchange equipment, the transmission and distribution equipment and the corresponding connecting pipelines of the air conditioning system are reduced, so that the initial investment can be greatly reduced by 10-20%.
Description
Technical Field
The invention relates to an air conditioning system, in particular to an ice cold storage air conditioning system for direct cooling.
Background
With the implementation of peak-valley flat electricity price, the ice storage air conditioning system is widely applied. In the existing design mode, in order to ensure the safe operation of the ice cold accumulation air conditioning system, a cold source side glycol solution and a user side water solution are isolated through a plate heat exchanger. The design mode has a plurality of defects in actual operation: 1) The existence of the plate heat exchanger causes heat exchange temperature difference between the cold source measurement and the user side, so that the evaporation temperature of the ice storage unit is reduced, and the COP of the ice storage unit is reduced; 2) The cold loss phenomenon of the solution at the cold source side and the user side of the plate heat exchanger in the heat exchange process is unavoidable; 3) The resistance of the glycol solution is greatly increased compared with that of the water solution, and the cold carrying capacity is greatly reduced compared with that of the water solution, so that the energy consumption of transmission and distribution is increased; 4) The plate heat exchanger is additionally arranged, so that the resistance component of the transmission and distribution system is increased, and further the transmission and distribution energy consumption is increased. The main reason for the current situation is that the air conditioning system does not consider various adverse effects caused by the addition of the plate heat exchanger for ice storage at the beginning of design, and a better solution is required to be provided for eliminating the existing defects.
Disclosure of Invention
The invention provides a direct cooling ice storage air conditioning system for solving the technical problems in the prior art, which has low manufacturing cost and high energy efficiency ratio.
The invention adopts the technical proposal for solving the technical problems in the prior art that: the system also comprises a double-mode water tank, wherein the double-mode water tank is provided with an aqueous solution tank and an ethylene glycol solution tank, the aqueous solution tank and the ethylene glycol solution tank are both provided with a discharge port and a reflux port, the discharge port of the ethylene glycol solution tank is connected with a heat exchange medium outlet pipe of the evaporator host through an ethylene glycol solution supply branch, and the reflux port of the ethylene glycol solution tank is connected with the heat exchange medium outlet pipe of the evaporator host through an ethylene glycol solution discharge branch; the water solution tank is characterized in that the discharge port of the water solution tank is connected with the heat exchange medium outlet pipe of the evaporator host through a water solution supply branch, and the reflux port of the water solution tank is connected with the heat exchange medium outlet pipe of the evaporator host through a water solution discharge branch; the glycol solution side of the ice storage tank and the heat exchange medium side of the evaporator host form a glycol solution circulation loop; the water cooling equipment and the heat exchange medium side of the evaporator host form a first aqueous solution circulation loop, and the water cooling equipment and the aqueous solution side of the ice storage tank form a second aqueous solution circulation loop.
The dual-mode water tank is arranged below the evaporator host, the discharge port of the ethylene glycol solution tank is arranged at the bottom of the ethylene glycol solution tank, the reflux port of the ethylene glycol solution tank is arranged at the top of the ethylene glycol solution tank, and the ethylene glycol solution supply branch is provided with a first check valve connected with the discharge port of the ethylene glycol solution tank and an ethylene glycol solution pump connected with the first check valve; a third electric two-way valve is arranged on the ethylene glycol solution discharge branch; a second check valve connected with a discharge port of the aqueous solution tank and an aqueous solution pump connected with the second check valve are arranged on the aqueous solution replenishing branch; and a fourth electric two-way valve is arranged on the water solution discharge branch.
The ethylene glycol solution circulation loop is provided with a first electric two-way valve connected with a heat exchange medium inlet pipe of the evaporator host, a fifth electric two-way valve connected with a heat exchange medium outlet pipe of the evaporator host and an ethylene glycol circulation pump.
The first aqueous solution circulation loop is provided with a second electric two-way valve connected with a heat exchange medium inlet pipe of the evaporator host, a sixth electric two-way valve connected with a heat exchange medium outlet pipe of the evaporator host and a chiller circulation pump.
And the second aqueous solution circulation loop is provided with an ice melting circulation pump.
The evaporator is characterized in that a first automatic air release valve is arranged at the highest position of a heat exchange medium inlet pipe of the evaporator main machine, and a second automatic air release valve is arranged at the highest position of a heat exchange medium outlet pipe of the evaporator main machine.
The invention has the advantages and positive effects that: the ethylene glycol solution and the aqueous solution are alternately supplied to the heat exchange medium side of the evaporator host by adopting the dual-mode water tank, meanwhile, an ethylene glycol solution circulation loop is established between the heat exchange medium side of the evaporator host and the ice storage tank, an aqueous solution circulation loop is established between the heat exchange medium side of the evaporator host and the water cooling equipment, and another solution circulation loop is established between the ice storage tank and the water cooling equipment, a plate heat exchanger is not required to be additionally arranged under the cooling working condition, high temperature water directly enters the ice storage machine to release heat, the water outlet temperature can be increased by 2-3 ℃, and the COP of the air conditioning system can be increased by 5-10%; the water directly enters the evaporator host for heat exchange under the cold supply working condition, so that the resistance link of the transmission and distribution system is reduced, and the transmission and distribution energy consumption is greatly reduced; the transmission and distribution pipeline and the heat exchange link of the air conditioning system are reduced, so that the heat loss in the transmission and distribution process can be reduced; the heat exchange equipment, the transmission and distribution equipment and the corresponding connecting pipelines of the air conditioning system are reduced, so that the initial investment can be greatly reduced by 10-20%. On the whole, the invention improves the running energy efficiency of the ice storage unit, reduces the initial investment and the running cost and has higher social benefit and economic benefit on the basis of solving the defects of the existing ice storage system.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. the system comprises a first electric two-way valve, 2, a second electric two-way valve, 3, a first automatic air release valve, 4, an evaporator host, 5, an ethylene glycol solution pump, 6, a first check valve, 7, a double-mode water tank, 8, a third electric two-way valve, 9, a fourth electric two-way valve, 10, an aqueous solution pump, 11, a second check valve, 12, a fifth electric two-way valve, 13, a sixth electric two-way valve, 14, a second automatic air release valve, 15, a controller, 16, an ice storage tank, 17, an ethylene glycol circulating pump, 18, a water cooling device, 19, a cold machine circulating pump, 20 and an ice melting circulating pump.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
referring to fig. 1, an ice storage air conditioning system for direct cooling comprises a controller 15, an evaporator host 4, an ice storage tank 16, a water cooling device 18, a dual-mode water tank 7, wherein the dual-mode water tank 7 is provided with an aqueous solution tank and an ethylene glycol solution tank, the aqueous solution tank and the ethylene glycol solution tank are respectively provided with a discharge port and a reflux port, the discharge port of the ethylene glycol solution tank is connected with a heat exchange medium outlet pipe of the evaporator host 4 through an ethylene glycol solution supply branch, and the reflux port of the ethylene glycol solution tank is connected with the heat exchange medium outlet pipe of the evaporator host 4 through an ethylene glycol solution discharge branch; the discharge port of the aqueous solution tank is connected with the heat exchange medium outlet pipe of the evaporator host 4 through an aqueous solution supply branch, and the reflux port of the aqueous solution tank is connected with the heat exchange medium outlet pipe of the evaporator host 4 through an aqueous solution discharge branch; the glycol solution side of the ice storage tank 16 and the heat exchange medium side of the evaporator host 4 form a glycol solution circulation loop to realize ice storage, the water cooling device 18 and the heat exchange medium side of the evaporator host 4 form a first aqueous solution circulation loop, the water cooling device 18 and the aqueous solution side of the ice storage tank 16 form a second aqueous solution circulation loop, and the evaporator host 4 and the ice storage tank 16 directly provide cold energy for the water cooling device 18 without passing through a plate heat exchanger. The invention adopts the controller 15 to realize automatic control.
In this embodiment, the dual-mode water tank 7 is disposed below the evaporator main unit 4, so as to quickly and effectively recover the liquid retained in the evaporator main unit 4 and the associated piping. The discharge port of the ethylene glycol solution tank is arranged at the bottom of the ethylene glycol solution tank, the reflux port of the ethylene glycol solution tank is arranged at the top of the ethylene glycol solution tank, and the ethylene glycol solution supply branch is provided with a first check valve 6 connected with the discharge port of the ethylene glycol solution tank and an ethylene glycol solution pump 5 connected with the first check valve 6; a third electric two-way valve 8 is arranged on the glycol solution discharge branch; a second check valve 11 connected to a discharge port of the aqueous solution tank and an aqueous solution pump 10 connected to the second check valve 11 are provided in the aqueous solution replenishing branch; a fourth electric two-way valve 9 is provided on the aqueous solution discharge branch. The glycol solution circulation loop is provided with a first electric two-way valve 1 connected with a heat exchange medium inlet pipe of the evaporator host 4, a fifth electric two-way valve 12 connected with a heat exchange medium outlet pipe of the evaporator host 4 and a glycol circulation pump 17. The first aqueous solution circulation loop is provided with a second electric two-way valve 2 connected with a heat exchange medium inlet pipe of the evaporator host 4, a sixth electric two-way valve 13 connected with a heat exchange medium outlet pipe of the evaporator host 4 and a chiller circulation pump 19. An ice-melting circulation pump 20 is provided in the second aqueous solution circulation circuit. The highest position of the heat exchange medium inlet pipe of the evaporator host 4 is provided with a first automatic air release valve 3, and the highest position of the heat exchange medium outlet pipe of the evaporator host 4 is provided with a second automatic air release valve 14 so as to timely exhaust the air in the pipeline.
The working principle of the invention is illustrated by taking the embodiment as an example:
ice storage working condition at night: closing the first electric two-way valve 1, the second electric two-way valve 2, the third electric two-way valve 8, the fifth electric two-way valve 12, the sixth electric two-way valve 13, the ethylene glycol solution pump 5 and the aqueous solution pump 10, and opening the fourth electric two-way valve 9, wherein the water in the evaporator host 4 and the related pipelines is automatically discharged into the aqueous solution tank in the dual-mode water tank 7; then, opening the ethylene glycol solution pump 5, closing the fourth electric two-way valve 9, and filling the evaporator 4 and the auxiliary related pipelines with the ethylene glycol solution in the ethylene glycol solution tank in the dual-mode water tank 7 through the first check valve 6 and the ethylene glycol solution pump 5; finally, the first electric two-way valve 1 and the fifth electric two-way valve 12 are opened, the ethylene glycol solution pump 5 is closed, the ethylene glycol circulating pump 17 is opened, and the ethylene glycol solution starts to circulate in the ethylene glycol solution circulating loop, and the specific process is as follows: the ice storage tank 16 absorbs heat to store ice, the warmed high-temperature glycol solution enters the evaporator host 4 to exchange heat with the refrigerant, and the cooled low-temperature glycol solution enters the ice storage tank 16 again through the fifth electric two-way valve 12 to absorb heat.
Daytime refrigeration working condition: closing the first electric two-way valve 1, the second electric two-way valve 2, the fourth electric two-way valve 9, the fifth electric two-way valve 12, the sixth electric two-way valve 13, the aqueous solution pump 10 and the ethylene glycol solution pump 5, opening the third electric two-way valve 8, and automatically discharging all the ethylene glycol solution in the evaporator 4 and the related pipelines thereof into the ethylene glycol solution tank in the dual-mode water tank 7; then, the water solution pump 10 is started, the third electric two-way valve 8 is closed, and the evaporator 4 and the associated related pipelines are filled with water of the water solution tank in the double-mode water tank 7 through the second check valve 11 and the water solution pump 10; finally, the second electric two-way valve 2 and the sixth electric two-way valve 13 are opened, and the aqueous solution pump 10 is closed; the cold machine circulating pump 19 and the ice melting circulating pump 20 are started, and the aqueous solution starts to circulate: a part of high-temperature water which completes heat absorption in the water cooling device 18 circulates in the second aqueous solution circulation loop, and the specific process is as follows: directly exchanging heat with ice in the ice storage tank 16, and conveying low-temperature water after heat exchange to the water cooling equipment 18 for heat absorption through the ice melting circulating pump 20; the other part of the high-temperature water which completes the heat absorption in the water cooling device 18 circulates in the first water solution circulation loop, and the specific process is as follows: the low-temperature water enters the evaporator host 4 through the second electric two-way valve 2 to exchange heat with the refrigerant, and the low-temperature water after heat exchange enters the cold machine circulating pump 19 through the sixth electric two-way valve 13 and is conveyed to the water cooling equipment 18 through the cold machine circulating pump 19 to absorb heat. The amount of cold load output of the ice storage tank 16 can be reasonably adjusted according to the cold load demand of the water cooling device 18 in the daytime so as to achieve the optimal economic effect.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are within the scope of the present invention.
Claims (4)
1. The ice cold accumulation air conditioning system is characterized by further comprising a double-mode water tank, wherein the double-mode water tank is provided with an aqueous solution tank and an ethylene glycol solution tank, the aqueous solution tank and the ethylene glycol solution tank are both provided with a discharge port and a reflux port, the discharge port of the ethylene glycol solution tank is connected with a heat exchange medium outlet pipe of the evaporator host through an ethylene glycol solution supply branch, and the reflux port of the ethylene glycol solution tank is connected with the heat exchange medium outlet pipe of the evaporator host through an ethylene glycol solution discharge branch; the water solution tank is characterized in that the discharge port of the water solution tank is connected with the heat exchange medium outlet pipe of the evaporator host through a water solution supply branch, and the reflux port of the water solution tank is connected with the heat exchange medium outlet pipe of the evaporator host through a water solution discharge branch; the glycol solution side of the ice storage tank and the heat exchange medium side of the evaporator host form a glycol solution circulation loop; the water cooling equipment and the heat exchange medium side of the evaporator host form a first aqueous solution circulation loop, and the water cooling equipment and the aqueous solution side of the ice storage tank form a second aqueous solution circulation loop;
the dual-mode water tank is arranged below the evaporator host, the discharge port of the ethylene glycol solution tank is arranged at the bottom of the ethylene glycol solution tank, the reflux port of the ethylene glycol solution tank is arranged at the top of the ethylene glycol solution tank, and the ethylene glycol solution supply branch is provided with a first check valve connected with the discharge port of the ethylene glycol solution tank and an ethylene glycol solution pump connected with the first check valve; a third electric two-way valve is arranged on the ethylene glycol solution discharge branch; a second check valve connected with a discharge port of the aqueous solution tank and an aqueous solution pump connected with the second check valve are arranged on the aqueous solution replenishing branch; a fourth electric two-way valve is arranged on the water solution discharge branch;
and the second aqueous solution circulation loop is provided with an ice melting circulation pump.
2. The ice thermal storage air conditioning system of claim 1, wherein a first electric two-way valve connected to a heat exchange medium inlet pipe of the evaporator main unit, a fifth electric two-way valve connected to a heat exchange medium outlet pipe of the evaporator main unit, and a glycol circulation pump are provided on the glycol solution circulation loop.
3. The ice thermal storage air conditioning system of claim 1, wherein a second electric two-way valve connected to a heat exchange medium inlet pipe of the evaporator main unit, and a sixth electric two-way valve and a chiller circulation pump connected to a heat exchange medium outlet pipe of the evaporator main unit are provided on the first aqueous solution circulation loop.
4. The ice thermal storage air conditioning system of claim 1, wherein a first automatic bleed valve is provided at the highest point of the heat exchange medium inlet pipe of the evaporator main unit, and a second automatic bleed valve is provided at the highest point of the heat exchange medium outlet pipe of the evaporator main unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810814338.9A CN108826547B (en) | 2018-07-23 | 2018-07-23 | Direct cooling ice cold-storage air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810814338.9A CN108826547B (en) | 2018-07-23 | 2018-07-23 | Direct cooling ice cold-storage air conditioning system |
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| Publication Number | Publication Date |
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| CN108826547A CN108826547A (en) | 2018-11-16 |
| CN108826547B true CN108826547B (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810814338.9A Active CN108826547B (en) | 2018-07-23 | 2018-07-23 | Direct cooling ice cold-storage air conditioning system |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0626672A (en) * | 1992-07-10 | 1994-02-04 | Daikin Ind Ltd | Ice making device |
| JPH1163752A (en) * | 1997-08-20 | 1999-03-05 | Toshiba Eng & Constr Co Ltd | Ice making device and ice making method |
| JP2002022300A (en) * | 2000-07-13 | 2002-01-23 | Daikin Ind Ltd | Refrigeration apparatus |
| CN2630716Y (en) * | 2003-05-14 | 2004-08-04 | 曹远平 | Iced-ball cold-storing energy-saving device for central air conditioning system |
| CN102155772A (en) * | 2011-05-06 | 2011-08-17 | 上禾谷能源科技（北京）有限公司 | Cascaded ice-storage air conditioning system and method utilizing same to supply cold air for air conditioner |
| CN102278796A (en) * | 2010-06-09 | 2011-12-14 | 同方节能工程技术有限公司 | Cold accumulation air conditioning system combining outer ice melting with water cold accumulation |
| CN104896641A (en) * | 2015-06-29 | 2015-09-09 | 中机西南能源科技有限公司 | Double-evaporator dynamic ice cold storage system |
| KR20150108729A (en) * | 2014-03-18 | 2015-09-30 | 박형인 | Refrigeration cycle radiator system heat exchanger |
| CN205939862U (en) * | 2016-08-24 | 2017-02-08 | 上海阿尔西空调系统服务有限公司 | Ice -chilling air conditioning system |
-
2018
- 2018-07-23 CN CN201810814338.9A patent/CN108826547B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0626672A (en) * | 1992-07-10 | 1994-02-04 | Daikin Ind Ltd | Ice making device |
| JPH1163752A (en) * | 1997-08-20 | 1999-03-05 | Toshiba Eng & Constr Co Ltd | Ice making device and ice making method |
| JP2002022300A (en) * | 2000-07-13 | 2002-01-23 | Daikin Ind Ltd | Refrigeration apparatus |
| CN2630716Y (en) * | 2003-05-14 | 2004-08-04 | 曹远平 | Iced-ball cold-storing energy-saving device for central air conditioning system |
| CN102278796A (en) * | 2010-06-09 | 2011-12-14 | 同方节能工程技术有限公司 | Cold accumulation air conditioning system combining outer ice melting with water cold accumulation |
| CN102155772A (en) * | 2011-05-06 | 2011-08-17 | 上禾谷能源科技（北京）有限公司 | Cascaded ice-storage air conditioning system and method utilizing same to supply cold air for air conditioner |
| KR20150108729A (en) * | 2014-03-18 | 2015-09-30 | 박형인 | Refrigeration cycle radiator system heat exchanger |
| CN104896641A (en) * | 2015-06-29 | 2015-09-09 | 中机西南能源科技有限公司 | Double-evaporator dynamic ice cold storage system |
| CN205939862U (en) * | 2016-08-24 | 2017-02-08 | 上海阿尔西空调系统服务有限公司 | Ice -chilling air conditioning system |
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| CN108826547A (en) | 2018-11-16 |
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