CN111426105A - Double-loop natural cooling type air conditioning system and control method thereof - Google Patents
Double-loop natural cooling type air conditioning system and control method thereof Download PDFInfo
- Publication number
- CN111426105A CN111426105A CN202010130043.7A CN202010130043A CN111426105A CN 111426105 A CN111426105 A CN 111426105A CN 202010130043 A CN202010130043 A CN 202010130043A CN 111426105 A CN111426105 A CN 111426105A
- Authority
- CN
- China
- Prior art keywords
- natural cooling
- evaporative condenser
- evaporator
- compressor
- refrigeration
- 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.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
Abstract
The invention discloses a double-loop natural cooling type air conditioning system and a control method, wherein the air conditioning system comprises: a refrigeration/free cooling circuit and a free cooling circuit, the refrigeration/free cooling circuit comprising: the system comprises a compressor, a first evaporative condenser, a first refrigerant pump and a first evaporator, wherein the inlet of the first evaporative condenser is communicated with the outlet of the compressor, and the inlet of the compressor is communicated with the outlet of the first evaporator; the outlet of the first evaporative condenser is communicated with the inlet of the first evaporator through the first refrigerant pump; the free cooling circuit includes: the inlet of the second evaporative condenser is communicated with the outlet of the second evaporator. The evaporator proportion and the compressor size can be configured according to the specific application environment, the system cost is reduced, meanwhile, a natural cold source is fully utilized, and the energy efficiency is improved.
Description
Technical Field
The present invention relates to air conditioning systems, and more particularly to a dual-circuit natural cooling type air conditioning system.
Background
People have entered the big data era, the scale and the quantity of data centers have been developed rapidly, and become the power utilization consumers of the information society. In order to ensure efficient and reliable operation of the data center, heat generated by the servers of the data center during operation needs to be rapidly exhausted. According to statistics, the electricity consumption of the modern social data center accounts for 5% of the total electricity of the whole society. IDC industry research reports have shown that by 2016, data centers scale to 714.5 billion dollars. In 2017, the electricity consumption of the Chinese data center exceeds 1250 hundred million kilowatts, and exceeds the electricity generation of three gorges hydropower stations and the power stations of the Gezhou dam for one year. According to statistics, the energy consumption of the air conditioners of the machine room and the base station accounts for 40% -50% of the total energy consumption. The enclosure structure of the data center is closed, the sensible heat load is large, the wet load is small, when the indoor temperature of the data center is higher than the outdoor temperature in spring and autumn transition seasons or even winter, the traditional air conditioning system still operates in a compression refrigeration mode to provide refrigeration capacity for the interior of a machine room, the energy consumption is large, and the problems of low-temperature starting of a compressor, poor lubrication effect, energy regulation and the like exist. In order to reduce the energy consumption of the data center and reasonably configure social resources, a refrigeration system of the data center needs to be optimized, wherein a natural cold source is a preferred mode for solving the problem of high energy consumption of a data center machine room at present, and the natural cold source is renewable energy. The utilization of outdoor natural cold sources has been the focus of researchers and engineers in the industry, and engineering research is being conducted in different forms, such as fresh air systems, gas-gas heat exchange systems, and gas-water heat exchange systems. In addition, composite air conditioners comprising various heat pipes, such as gravity-type separated heat pipes, liquid pump-powered separated heat pipes, and air pump-powered separated heat pipes, have been proposed and used. However, most of the above solutions are limited to be used in small data center rooms, and are not well used in large data centers.
In the prior art, the refrigerant pump and the magnetic suspension compressor are completed in the same loop, so that the cost is low, the energy-saving benefit is high, but the matching of the compressor is more likely in the system, and the energy efficiency has a continuous optimization space.
Disclosure of Invention
The invention aims to provide a double-loop natural cooling type air conditioning system, which can configure the proportion of an evaporator and the size of a compressor according to a specific application environment, realize the reduction of the system cost, fully utilize a natural cold source and improve the energy efficiency.
The invention also aims to provide a control method of the double-loop natural cooling type air conditioning system.
The technical scheme for realizing the purpose is as follows:
the invention relates to a double-loop natural cooling type air conditioning system, which comprises: a refrigeration/free cooling circuit, and a free cooling circuit, wherein,
the refrigeration/free cooling circuit includes: a compressor, a first evaporative condenser, a first refrigerant pump and a first evaporator,
the inlet of the first evaporative condenser is communicated with the outlet of the compressor, and the inlet of the compressor is communicated with the outlet of the first evaporator;
the outlet of the first evaporative condenser is communicated with the inlet of the first evaporator through the first refrigerant pump;
a first one-way valve is arranged between the first evaporative condenser and the compressor;
a series branch formed by the compressor and the first check valve is connected with a second check valve in parallel;
the free cooling circuit includes: a second evaporative condenser, a second refrigerant pump, and a second evaporator,
the inlet of the second evaporative condenser is communicated with the outlet of the second evaporator;
the outlet of the second evaporative condenser is communicated with the inlet of the second evaporator through the second refrigerant pump.
Preferably, a first electronic expansion valve is arranged between the first refrigerant pump and the first evaporator;
and a second electronic expansion valve is arranged between the second refrigerant pump and the second evaporator.
Preferably, the first evaporative condenser, the first refrigerant pump and the first evaporator are all designed as a refrigeration/natural cooling unit;
the second evaporative condenser, the second refrigerant pump and the second evaporator are all designed as natural cooling units.
Preferably, the first evaporative condenser and the second evaporative condenser constitute a complete evaporative condenser, and the complete evaporative condenser is externally connected with a water pump.
Preferably, the number of the compressors is one or more, and the compressors are magnetic suspension compressors or air suspension compressors.
Preferably, a dry filter, a sight glass and a liquid storage device are arranged between the first evaporative condenser and the first electronic expansion valve and/or between the second evaporative condenser and the second electronic expansion valve.
According to the air conditioner control method based on the double-loop natural cooling type air conditioner system, when the outdoor temperature is higher than the set value T, the natural cooling loop operates a natural cooling mode to obtain the natural cooling capacity; the refrigeration/natural cooling operation loop carries out a refrigeration mode according to the load size to obtain mechanical refrigeration cold, and the sum of the natural cooling cold and the mechanical refrigeration cold is set total cold;
when the outdoor temperature is less than or equal to a set value T, the natural cooling loop operates a natural cooling mode to obtain first natural cooling capacity; the refrigeration/natural cooling operation loop also operates a natural cooling mode to obtain second natural cooling capacity, and the sum of the first natural cooling capacity and the second natural cooling capacity is set total cooling capacity.
The invention has the beneficial effects that: the invention is composed of two loops of refrigeration/natural cooling and natural cooling, the two loops share one set of evaporative condenser, the evaporator has two-section design, can greatly provide the working time of natural cooling (partial natural cooling and full natural cooling) so as to greatly improve the system performance, the invention can configure the evaporator proportion and the compressor size according to the specific application environment, can effectively reduce the cooling pressure of the compressor, and can adopt a smaller compressor so as to further reduce the compression energy consumption. The cost of the system is reduced, meanwhile, a natural cold source is fully utilized, and the energy efficiency is improved.
Drawings
Fig. 1 is a structural view of a dual circuit natural cooling type air conditioning system of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, the dual-circuit natural cooling type air conditioning system of the present invention includes: a refrigeration/free cooling circuit and a free cooling circuit.
The refrigeration/free cooling circuit includes: a compressor 1, a first evaporative condenser 2A, a first refrigerant pump 3A, and a first evaporator 5A.
The inlet of the first evaporative condenser 2A communicates with the outlet of the compressor 1, and the inlet of the compressor 1 communicates with the outlet of the first evaporator 5A. The outlet of the first evaporative condenser 2A communicates with the inlet of the first evaporator 5A via the first refrigerant pump 3A. A first check valve 6A is provided between the first evaporative condenser 2A and the compressor 1. The serial branch formed by the compressor 1 and the first check valve 6A is connected with the second check valve 6B in parallel. The inlet of the first refrigerant pump 3A communicates with the outlet of the first evaporative condenser 2A.
The free cooling circuit includes: a second evaporative condenser 2B, a second refrigerant pump 3B, and a second evaporator 5B. The inlet of the second evaporative condenser 2B communicates with the outlet of the second evaporator 5B. The outlet of the second evaporative condenser 2B communicates with the inlet of the second evaporator 5B via a second refrigerant pump 3B. The outlet of the second evaporative condenser 2B communicates with the inlet of the second refrigerant pump 3B.
A first electronic expansion valve 4A is provided between the first refrigerant pump 3A and the first evaporator 5A. A second electronic expansion valve 4B is provided between the second refrigerant pump 3B and the second evaporator 5B. The inlet of the first electronic expansion valve 4A communicates with the outlet of the first refrigerant pump 3A. An inlet of the second electronic expansion valve 4B communicates with an outlet of the second refrigerant pump 3B.
The first evaporative condenser 2A, the first refrigerant pump 3A, and the first evaporator 5A are all designed as a refrigeration/natural cooling unit; the second evaporative condenser 2B, the second refrigerant pump 3B, and the second evaporator 5B are each designed as a free cooling unit.
The first evaporative condenser 2A and the second evaporative condenser 2B constitute a complete evaporative condenser 2, and the complete evaporative condenser 5 is externally connected with a water pump 7. The first evaporator 5A and the second evaporator 5B constitute a complete evaporator 5. The first refrigerant pump 3A and the second refrigerant pump 3B constitute a complete refrigerant pump.
The number of the compressors 1 is one or more, and is a magnetic suspension compressor or an air suspension compressor.
The dry filter, the sight glass and the liquid storage device can be arranged between the first evaporative condenser 2A and the first electronic expansion valve 4A and/or between the second evaporative condenser 2B and the second electronic expansion valve 4B according to specific requirements.
The invention is based on the air-conditioning control method of the double-loop natural cooling type air-conditioning system, the refrigeration/natural cooling loop can not only run a refrigeration mode (mechanical refrigeration: depending on mechanical action or thermal action, the state change of a refrigeration working medium is generated, the refrigeration cycle is completed, and the refrigeration is carried out by utilizing the temperature rise or the state change of the working medium at low temperature), but also run a natural cooling mode (natural cooling is a process of discharging heat from an object to an environment medium through heat transfer modes such as heat exchange, convection, heat radiation and the like, reducing the temperature of the object and finally achieving the spontaneity same as the environment temperature). When the outdoor temperature is higher than a set value T, the natural cooling loop operates a natural cooling mode to obtain natural cooling capacity; the refrigeration/natural cooling operation loop carries out refrigeration mode according to the load to compensate the deficiency of the natural cooling loop, namely: the sum of the mechanical refrigeration cold quantity, the natural refrigeration cold quantity and the mechanical refrigeration cold quantity is set total cold quantity.
When the outdoor temperature is less than or equal to a set value T, the natural cooling loop operates a natural cooling mode to obtain first natural cooling capacity; the refrigeration/natural cooling operation loop also operates a natural cooling mode to obtain second natural cooling capacity, and the sum of the first natural cooling capacity and the second natural cooling capacity is set total cooling capacity. Therefore, the amount of cold energy provided by the first section of natural cooling under the worst working condition and the amount of mechanical refrigeration needed for supplement can be evaluated according to the climate conditions of different working places. After the comparison information is obtained, the size of the coil pipe can be designed according to the proportional cold quantity. Therefore, the cooling capacity of the compressor can be effectively reduced, and a smaller compressor can be adopted, so that the compression energy consumption is further reduced. The system operation mode control and the performance output can be realized by operating a compressor, a refrigerant pump and the like through an electric control system.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (7)
1. A dual circuit natural cooling air conditioning system comprising: a refrigeration/free cooling circuit, and a free cooling circuit, wherein,
the refrigeration/free cooling circuit includes: a compressor, a first evaporative condenser, a first refrigerant pump and a first evaporator,
the inlet of the first evaporative condenser is communicated with the outlet of the compressor, and the inlet of the compressor is communicated with the outlet of the first evaporator;
the outlet of the first evaporative condenser is communicated with the inlet of the first evaporator through the first refrigerant pump;
a first one-way valve is arranged between the first evaporative condenser and the compressor;
a series branch formed by the compressor and the first check valve is connected with a second check valve in parallel;
the free cooling circuit includes: a second evaporative condenser, a second refrigerant pump, and a second evaporator,
the inlet of the second evaporative condenser is communicated with the outlet of the second evaporator;
the outlet of the second evaporative condenser is communicated with the inlet of the second evaporator through the second refrigerant pump.
2. The dual circuit natural cooling air conditioning system of claim 1, wherein a first electronic expansion valve is disposed between the first refrigerant pump and the first evaporator;
and a second electronic expansion valve is arranged between the second refrigerant pump and the second evaporator.
3. The dual circuit free-cooling air conditioning system of claim 1 wherein the first evaporative condenser, first refrigerant pump and first evaporator are each designed as a refrigeration/free-cooling unit;
the second evaporative condenser, the second refrigerant pump and the second evaporator are all designed as natural cooling units.
4. The dual circuit free-cooling air conditioning system of claim 1, wherein the first evaporative condenser and the second evaporative condenser comprise a complete evaporative condenser, the complete evaporative condenser being externally connected to a water pump.
5. The dual circuit natural cooling type air conditioning system as claimed in claim 1, wherein the number of the compressors is one or more and is a magnetic levitation compressor or an air levitation compressor.
6. The dual circuit natural cooling air conditioning system of claim 2, wherein a dry filter, a sight glass, and an accumulator are disposed between the first evaporative condenser and the first electronic expansion valve, and/or between the second evaporative condenser and the second electronic expansion valve.
7. The air-conditioning control method of the double-circuit natural cooling type air-conditioning system according to any one of claims 1 to 6, characterized in that when the outdoor temperature is higher than a set value T, the natural cooling circuit operates a natural cooling mode to obtain natural cooling capacity; the refrigeration/natural cooling operation loop carries out a refrigeration mode according to the load size to obtain mechanical refrigeration cold, and the sum of the natural cooling cold and the mechanical refrigeration cold is set total cold;
when the outdoor temperature is less than or equal to a set value T, the natural cooling loop operates a natural cooling mode to obtain first natural cooling capacity; the refrigeration/natural cooling operation loop also operates a natural cooling mode to obtain second natural cooling capacity, and the sum of the first natural cooling capacity and the second natural cooling capacity is set total cooling capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010130043.7A CN111426105A (en) | 2020-02-28 | 2020-02-28 | Double-loop natural cooling type air conditioning system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010130043.7A CN111426105A (en) | 2020-02-28 | 2020-02-28 | Double-loop natural cooling type air conditioning system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111426105A true CN111426105A (en) | 2020-07-17 |
Family
ID=71547415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010130043.7A Pending CN111426105A (en) | 2020-02-28 | 2020-02-28 | Double-loop natural cooling type air conditioning system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111426105A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066496A (en) * | 2020-09-21 | 2020-12-11 | 珠海格力电器股份有限公司 | Evaporation cooling unit, control method thereof and refrigeration equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205939415U (en) * | 2016-08-17 | 2017-02-08 | 北京丰联奥睿科技有限公司 | A air conditioning system for data center |
| KR101727561B1 (en) * | 2016-01-27 | 2017-05-02 | 한국이미지시스템(주) | Energy-saving industrial air-conditioner and the operation method |
| CN107305044A (en) * | 2016-04-21 | 2017-10-31 | 艾默生网络能源有限公司 | A kind of energy-saving machine room air-conditioning system and its operation method |
| CN208419039U (en) * | 2018-04-20 | 2019-01-22 | 北京丰联奥睿科技有限公司 | A kind of band adds the air-conditioning system of natural cooling function |
| CN208458155U (en) * | 2018-05-23 | 2019-02-01 | 南京佳力图机房环境技术股份有限公司 | A kind of energy conservation Two-way Cycle air conditioner in machine room unit |
| CN211625788U (en) * | 2020-02-28 | 2020-10-02 | 克莱门特捷联制冷设备(上海)有限公司 | Double-loop natural cooling type air conditioning system |
-
2020
- 2020-02-28 CN CN202010130043.7A patent/CN111426105A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101727561B1 (en) * | 2016-01-27 | 2017-05-02 | 한국이미지시스템(주) | Energy-saving industrial air-conditioner and the operation method |
| CN107305044A (en) * | 2016-04-21 | 2017-10-31 | 艾默生网络能源有限公司 | A kind of energy-saving machine room air-conditioning system and its operation method |
| CN205939415U (en) * | 2016-08-17 | 2017-02-08 | 北京丰联奥睿科技有限公司 | A air conditioning system for data center |
| CN208419039U (en) * | 2018-04-20 | 2019-01-22 | 北京丰联奥睿科技有限公司 | A kind of band adds the air-conditioning system of natural cooling function |
| CN208458155U (en) * | 2018-05-23 | 2019-02-01 | 南京佳力图机房环境技术股份有限公司 | A kind of energy conservation Two-way Cycle air conditioner in machine room unit |
| CN211625788U (en) * | 2020-02-28 | 2020-10-02 | 克莱门特捷联制冷设备(上海)有限公司 | Double-loop natural cooling type air conditioning system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066496A (en) * | 2020-09-21 | 2020-12-11 | 珠海格力电器股份有限公司 | Evaporation cooling unit, control method thereof and refrigeration equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106839481B (en) | Cooling unit with auxiliary cold source | |
| CN112097356A (en) | Fluorine pump type machine room air-cooled precision air conditioner | |
| CN210089039U (en) | Air conditioning system for data center | |
| CN211476360U (en) | Ground source heat pump air conditioning device for energy storage battery container | |
| CN210165500U (en) | Compound air conditioning system for data center | |
| CN112672615A (en) | Communication base station thermal management system and method based on thermal energy storage | |
| CN201527055U (en) | Air handling device with natural heat supply and humidity control | |
| CN109341138B (en) | Combined air conditioning system of machine room and hot water system and control method thereof | |
| CN109340960B (en) | Combined air conditioning system of machine room and control method thereof | |
| CN211625788U (en) | Double-loop natural cooling type air conditioning system | |
| CN201615645U (en) | Solar energy evaporative cooling type heat pump unit | |
| CN201438010U (en) | Phase-change energy storage air conditioner | |
| CN111426105A (en) | Double-loop natural cooling type air conditioning system and control method thereof | |
| CN105674449A (en) | Triple-generation system based on energy-saving solar air source heat pump | |
| CN209877233U (en) | Energy-saving reconstruction system for air conditioner of machine room | |
| CN102072531B (en) | Four-pipe type heat recovery multi-split air conditioning system | |
| CN109357427B (en) | Combined air conditioning system for machine room and hot water system and control method thereof | |
| CN215675897U (en) | Air conditioning system | |
| CN210107616U (en) | Natural cooling type air conditioning system for data center | |
| CN211625785U (en) | Evaporative cooling type composite air conditioning system | |
| CN210107617U (en) | Air conditioning system with natural cooling function | |
| CN210165499U (en) | Coupling type air conditioning system for data center | |
| CN112996363A (en) | Full-time natural cooling data center air conditioning system | |
| CN202133040U (en) | Double-working-condition variable flow energy-saving air conditioner | |
| CN101922770A (en) | Phase change energy storage air conditioning |
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 |