CN109340960B - Combined air conditioning system of machine room and control method thereof - Google Patents
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- CN109340960B CN109340960B CN201811132504.3A CN201811132504A CN109340960B CN 109340960 B CN109340960 B CN 109340960B CN 201811132504 A CN201811132504 A CN 201811132504A CN 109340960 B CN109340960 B CN 109340960B
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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
- F24F5/001—Compression cycle type
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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Abstract
The invention discloses a combined air conditioning system of a machine room and a room, which comprises a machine room compressor, a refrigeration condenser, a first throttling device, an air distribution reservoir, a liquid pump, a machine room evaporator, a hot pipe valve, a heat pipe condenser, a refrigeration valve, a second throttling device, a one-way valve, a condensation evaporator, a room compressor, a four-way valve, an indoor heat exchanger, a third throttling device, a fourth throttling device, an outdoor heat exchanger and a bypass valve, wherein the inlet of the refrigeration condenser is communicated with the outlet of the machine room compressor; the outlet of the refrigeration condenser is communicated with the inlet of the first throttling device; the air distribution reservoir is respectively communicated with an inlet of the machine room compressor, an outlet of the heat pipe condenser, an outlet of the first throttling device and an inlet of the liquid pump. The invention can realize high-efficiency refrigeration of the machine room, can realize high-energy-efficiency heating of the heat recovery of the machine room all the year round, fully utilizes the outdoor natural cold source and the heat of the machine room, and has excellent energy-saving and emission-reducing effects.
Description
Technical Field
The invention relates to the technical field of air conditioners.
Background
The rapid development of information industry and digital construction promotes the number of machine rooms and base stations, the construction scale is rapidly increased, and the energy consumption of the air conditioners of the machine rooms and the base stations accounts for 40% -50% of the total energy consumption according to statistics. The sensible heat load ratio of machine room, base station is big, need continuous operation throughout the year, and in the season that indoor side settlement temperature is less than outdoor side temperature, conventional air conditioning system still need continue to operate compression refrigerating system, and refrigerating system work efficiency is low and easily breaks down, if can utilize indoor outer difference in temperature low-cost transport heat or for indoor side provides cold volume, will reduce air conditioning system's energy consumption and running cost greatly. The refrigerating system can be efficiently operated by utilizing the land cooling in high-temperature seasons such as summer and the like. And the energy efficiency of the system is greatly improved. The method of providing cold energy to indoor side by using outdoor low-temperature air has been paid attention by the researchers and the engineers in the industry, and the researches on engineering technology are developed in different forms, such as the currently adopted fresh air system, the air-air and air-water heat exchange systems in different forms, and the composite air conditioner applying the heat pipe technology.
Disclosure of Invention
The invention aims to provide a combined air conditioning system of a machine room and a control method thereof, which improve the operation efficiency of the system and realize energy conservation and emission reduction.
The technical scheme for realizing the purpose is as follows:
a combined air conditioning system of machine room and room comprises a machine room compressor, a refrigeration condenser, a first throttling device, an air-separating reservoir, a liquid pump, a machine room evaporator, a heat pipe valve, a heat pipe condenser, a refrigeration valve, a second throttling device, a one-way valve, a condensation evaporator, a room compressor, a four-way valve, an indoor heat exchanger, a third throttling device, a fourth throttling device, an outdoor heat exchanger and a bypass valve,
the inlet of the refrigeration condenser is communicated with the outlet of the machine room compressor; the outlet of the refrigeration condenser is communicated with the inlet of the first throttling device;
the air distribution liquid storage device is respectively communicated with an inlet of the machine room compressor, an outlet of the heat pipe condenser, an outlet of the first throttling device and an inlet of the liquid pump;
the outlet of the liquid pump is communicated with the inlet of the machine room evaporator through a one-way valve;
the first interface of the condensation evaporator is communicated with the outlet of the machine room evaporator through the heat pipe valve, the second interface is communicated with the inlet of the heat pipe condenser, the third interface is communicated with the first end of the outdoor heat exchanger through a fourth throttling device, and the fourth interface is communicated with the first end of the indoor heat exchanger through the third throttling device;
two ends of the refrigerating valve are respectively communicated with an outlet of the machine room evaporator and an outlet of the heat pipe condenser;
two ends of the second throttling device are respectively communicated with an outlet of the refrigeration condenser and an inlet of the machine room evaporator;
four ports of the four-way valve are respectively communicated with two ends of the room compressor, a second end of the outdoor heat exchanger and a second end of the indoor heat exchanger;
one end of the bypass valve is communicated with the first end of the outdoor heat exchanger, and the other end of the bypass valve passes through the fourth interface of the condensation evaporator.
Preferably, the refrigeration condenser is a water-cooled condenser, an air-cooled condenser or an evaporative condenser.
A control method of a combined air-conditioning system is characterized in that when the outdoor temperature T0 is higher than the set temperature T2, a machine room air conditioner needs to supply cold, and a room air-conditioning system needs to supply cold, namely the machine room air-conditioning system runs in a refrigeration mode and the room air-conditioning system runs in a refrigeration mode, a refrigeration valve is opened at the moment, a heat pipe valve is closed, a first throttling device is closed, a bypass valve is opened, and the machine room air-conditioning system forms a loop by a machine room compressor, a refrigeration condenser, a second throttling device, a machine room evaporator, a refrigeration valve and a gas-liquid separator; the room air-conditioning system comprises a room compressor, a four-way valve, an indoor heat exchanger, a third throttling device, a bypass valve and an outdoor heat exchanger to form a refrigerating loop, and the room air-conditioning system and the machine room air-conditioning system work independently to refrigerate at the moment;
when the outdoor temperature is higher than the set temperature T1 and lower than or equal to the set temperature T2, the room needs to supply heat, and the machine room air conditioner needs to supply cold, namely, the room air conditioning system needs to operate a heating mode, the machine room air conditioner needs to perform a coupling mode, at the moment, the cooling valve is closed, the heat pipe valve is opened, the second throttling device is closed, the bypass valve is closed, and the machine room air conditioning system forms a loop by a machine room compressor, a cooling condenser, a first throttling device, an air distribution liquid storage device, a liquid pump, a one-way valve, a machine room evaporator, a heat pipe valve, a condensation evaporator and a heat; the room air-conditioning system comprises a room compressor, a four-way valve, an indoor heat exchanger, a third throttling device, a condensing evaporator, a fourth throttling device and an outdoor heat exchanger to form a heating loop;
when the outdoor temperature is higher than the set temperature T1 and lower than or equal to the set temperature T2, the room does not need to supply heat, the machine room air conditioner needs to supply cold, namely, the room air conditioning system does not run, the machine room air conditioner needs to perform a coupling mode, at the moment, the refrigerating valve is closed, the heat pipe valve is opened, the second throttling device is closed, and the machine room air conditioning system forms a loop by a machine room compressor, a refrigerating condenser, a first throttling device, an air distribution liquid storage device, a liquid pump, a one-way valve, a machine room evaporator, a heat pipe valve, a condensing evaporator and a heat pipe condenser;
when the outdoor temperature T0 is less than or equal to the set temperature T1, the room needs to supply heat, the machine room air conditioner needs to supply cold, namely, the room air conditioning system needs to operate a heating mode, the machine room air conditioner needs to perform a liquid-phase heat pipe mode, the refrigerating valve is closed, the heat pipe valve is opened, the first throttling device and the second throttling device are closed, and the machine room air conditioning system forms a loop by the air-separating liquid reservoir, the liquid pump, the one-way valve, the machine room evaporator, the heat pipe valve, the condensing evaporator and the heat pipe condenser; the room air-conditioning system comprises a room compressor, a four-way valve, an indoor heat exchanger, a third throttling device, a condensing evaporator, a fourth throttling device and an outdoor heat exchanger to form a heating loop.
The invention has the beneficial effects that: according to the invention, the room air conditioning system and the machine room air conditioning system are integrated, different working modes can be switched and operated according to the outdoor environment temperature, the machine room can be efficiently refrigerated, the machine room heat recovery can be efficiently heated all the year round, the outdoor natural cold source and the machine room heat are fully utilized, and the energy-saving and emission-reducing effects are excellent.
Drawings
Fig. 1 is a structural view of a combined air conditioning system of a machine room and a room of the present invention;
FIG. 2 is a schematic view of the cycle of the cooling + cooling mode of the present invention;
FIG. 3 is a schematic diagram of the cycle of the coupled + heating mode of the present invention;
FIG. 4 is a schematic diagram of the coupling + off mode cycle of the present invention;
fig. 5 is a cycle structure diagram of the heat pipe + heating mode in the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, the combined air conditioning system for a machine room and a room of the present invention includes a machine room compressor 1, a refrigeration condenser 2, a first throttling device 3, an air-separating reservoir 4, a liquid pump 5, a machine room evaporator 6, a heat pipe valve 7, a heat pipe condenser 8, a refrigeration valve 9, a second throttling device 10, a check valve 11, a condensing evaporator 12, a room compressor 13, a four-way valve 14, an indoor heat exchanger 15, a third throttling device 16, a fourth throttling device 17, an outdoor heat exchanger 18, and a bypass valve 19.
The inlet of the refrigeration condenser 2 is communicated with the outlet of the machine room compressor 1; the outlet of the refrigeration condenser 2 is communicated with the inlet of the first throttling device 3; the air distribution liquid storage device 4 is respectively communicated with an inlet of the machine room compressor 1, an outlet of the heat pipe condenser 8, an outlet of the first throttling device 3 and an inlet of the liquid pump 5; the outlet of the liquid pump 5 is communicated with the inlet of the machine room evaporator 6 through a one-way valve 11.
The first interface of the condensation evaporator 12 is communicated with the outlet of the machine room evaporator 6 through the heat pipe valve 7, the second interface is communicated with the inlet of the heat pipe condenser 8, the third interface is communicated with the first end of the outdoor heat exchanger 18 through a fourth throttling device 17, and the fourth interface is communicated with the first end of the indoor heat exchanger 15 through a third throttling device 16. Two ends of the refrigerating valve 9 are respectively communicated with an outlet of the machine room evaporator 6 and an outlet of the heat pipe condenser 8; two ends of the second throttling device 10 are respectively communicated with the outlet of the refrigeration condenser 2 and the inlet of the machine room evaporator 6;
four ports of the four-way valve 14 are respectively communicated with two ends of the room compressor 13, a second end of the outdoor heat exchanger 18 and a second end of the indoor heat exchanger 15; one end of the bypass valve 19 is communicated with the first end of the outdoor heat exchanger 18, and the other end of the bypass valve passes through the fourth port of the condensing evaporator 12. The refrigeration condenser 2 is a water-cooled condenser, an air-cooled condenser or an evaporative condenser.
The control method of the combined air-conditioning system of the invention switches different loops to operate different working modes respectively according to different outdoor environment temperatures, different seasons and hot water supply requirements.
When the outdoor temperature is summer (the outdoor temperature T0 is more than the set temperature T2), the machine room air conditioner needs cooling, the room air conditioning system needs cooling, namely the machine room air conditioning system operates in a refrigeration mode, and the room air conditioning system operates in a refrigeration mode, as shown in FIG. 2, at the moment, a refrigeration valve 9 is opened, a heat pipe valve 7 is closed, a first throttling device 3 is closed, a bypass valve 19 is opened, and the machine room air conditioning system forms a loop by a machine room compressor 1, a refrigeration condenser 2, a second throttling device 10, a machine room evaporator 6, a refrigeration valve 9 and an air distribution liquid storage device 4; and the rotating speed of the compressor, the opening of the expansion valve and the rotating speed of the condenser fan are determined according to the indoor load and the outdoor temperature, so that the cold quantity regulation is realized. The room air conditioning system is a refrigeration loop formed by a room compressor 13, a four-way valve 14, an indoor heat exchanger 15, a third throttling device 16, a bypass valve 19 and an outdoor heat exchanger 18, and the room air conditioning system and the machine room air conditioning system work independently at the moment for refrigeration.
When in spring and autumn transition outdoors (the outdoor temperature is greater than the set temperature T1 and less than or equal to the set temperature T2), the room needs to supply heat, the air conditioner in the machine room needs to supply cold, namely the air conditioning system in the room needs to operate in a heating mode, and the air conditioner in the machine room needs to perform a coupling mode, as shown in FIG. 3, at this time, the cooling valve 9 is closed, the heat pipe valve 7 is opened, the second throttling device 10 is closed, the bypass valve 19 is closed, and the air conditioning system in the machine room comprises a machine room compressor 1, a cooling condenser 2, a first throttling device 3, an air distribution liquid reservoir 4, a liquid pump 5, a one-way valve 11, a machine room evaporator 6, a heat pipe valve 7, a condensation; and the rotating speed of the compressor and the rotating speed of the condenser fan are determined according to the indoor load and the outdoor temperature, so that the accurate adjustment of the cooling capacity is realized. The room air conditioning system is a heating circuit composed of a room compressor 13, a four-way valve 14, an indoor heat exchanger 15, a third throttling device 16, a condensing evaporator 12, a fourth throttling device 17, and an outdoor heat exchanger 18.
When the outdoor temperature is higher than the set temperature T1 and lower than or equal to the set temperature T2 in spring and autumn, the room does not need to supply heat, the air conditioner in the machine room needs to supply cold, that is, the air conditioning system in the room does not operate, and the air conditioner in the machine room needs to perform a coupling mode, as shown in fig. 4, at this time, the refrigeration valve 8 is closed, the heat pipe valve 7 is opened, the second throttling device 10 is closed, and the air conditioning system in the machine room forms a loop by the machine room compressor 1, the refrigeration condenser 2, the first throttling device 3, the air distribution reservoir 4, the liquid pump 5, the check valve 11, the machine room evaporator 6, the heat pipe valve 7, the condensation evaporator 12 and.
When the outdoor temperature is not more than the set temperature T1 in winter (the outdoor temperature T0 is not more than the set temperature T1), the room needs to supply heat, the machine room air conditioner needs to supply cold, namely, the room air conditioning system needs to operate a heating mode, and the machine room air conditioner needs to perform a liquid-phase heat pipe mode, as shown in FIG. 5, at the moment, a refrigerating valve 9 is closed, a heat pipe valve 7 is opened, a first throttling device 3 and a second throttling device 10 are closed, and the machine room air conditioning system forms a loop by a gas distribution liquid storage device 4, a liquid pump 5, a one-way valve 11, a machine room evaporator 6, the heat pipe valve 7; the rotating speeds of a liquid pump and a condenser fan are determined according to the indoor load and the outdoor temperature, so that the accurate adjustment of cold quantity is realized, the working pressure (temperature) of a heat pipe is controlled, and the heat exchange capacity of the heat pipe is adjusted in the following specific mode: when the outdoor environment temperature rises or the indoor load increases, the rotating speed of the fan is increased; and when the outdoor temperature is reduced or the indoor load is reduced, reducing the rotating speed of the fan. The room air conditioning system is a heating circuit composed of a room compressor 13, a four-way valve 14, an indoor heat exchanger 15, a third throttling device 16, a condensing evaporator 12, a fourth throttling device 17, and an outdoor heat exchanger 18. The room is heated by the heat of the machine room preferentially, and the room is heated by the operation heating mode when the room is insufficient.
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 (3)
1. A combined air conditioning system of a machine room and a room comprises a machine room compressor (1), a refrigeration condenser (2), a first throttling device (3), a liquid pump (5), a machine room evaporator (6), a heat pipe valve (7), a heat pipe condenser (8), a refrigeration valve (9), a one-way valve (11), a room compressor (13), a four-way valve (14), an indoor heat exchanger (15), a third throttling device (16), an outdoor heat exchanger (18) and a bypass valve (19), and is characterized by further comprising a gas distribution liquid storage device (4), a second throttling device (10), a condensation evaporator (12) and a fourth throttling device (17), wherein,
the inlet of the refrigeration condenser (2) is communicated with the outlet of the machine room compressor (1); the outlet of the refrigeration condenser (2) is communicated with the inlet of the first throttling device (3);
the air distribution liquid storage device (4) is respectively communicated with an inlet of the machine room compressor (1), an outlet of the heat pipe condenser (8), an outlet of the first throttling device (3) and an inlet of the liquid pump (5);
the outlet of the liquid pump (5) is communicated with the inlet of the machine room evaporator (6) through a one-way valve (11);
a first interface of the condensation evaporator (12) is communicated with an outlet of the machine room evaporator (6) through the heat pipe valve (7), a second interface is communicated with an inlet of the heat pipe condenser (8), a third interface is communicated with a first end of the outdoor heat exchanger (18) through a fourth throttling device (17), and a fourth interface is communicated with a first end of the indoor heat exchanger (15) through a third throttling device (16);
two ends of the refrigerating valve (9) are respectively communicated with an outlet of the machine room evaporator (6) and an outlet of the heat pipe condenser (8);
two ends of the second throttling device (10) are respectively communicated with an outlet of the refrigeration condenser (2) and an inlet of the machine room evaporator (6);
four ports of the four-way valve (14) are respectively communicated with two ends of the room compressor (13), a second end of the outdoor heat exchanger (18) and a second end of the indoor heat exchanger (15);
one end of the bypass valve (19) is communicated with the first end of the outdoor heat exchanger (18), and the other end of the bypass valve passes through a fourth interface of the condensation evaporator (12).
2. Combined machine room and room air conditioning system according to claim 1, characterized in that the refrigerated condenser (2) is a water-cooled condenser, an air-cooled condenser or an evaporative condenser.
3. A control method of a combined air conditioning system as set forth in claim 1,
when the outdoor temperature T0 is greater than the set temperature T2, the machine room air conditioner needs to supply cold, the room air conditioning system needs to supply cold, namely, the machine room air conditioning system operates in a refrigeration mode, the refrigeration valve (9) is opened at the moment, the heat pipe valve (7) is closed, the first throttling device (3) is closed, the bypass valve (19) is opened, and the machine room air conditioning system forms a loop by the machine room compressor (1), the refrigeration condenser (2), the second throttling device (10), the machine room evaporator (6), the refrigeration valve (9) and the air-split liquid accumulator (4); the room air conditioning system is composed of a room compressor (13), a four-way valve (14), an indoor heat exchanger (15), a third throttling device (16), a bypass valve (19) and an outdoor heat exchanger (18) to form a refrigeration loop, and the room air conditioning system and the machine room air conditioning system work independently at the moment for refrigeration;
when the outdoor temperature is greater than the set temperature T1 and less than or equal to the set temperature T2, the room needs to supply heat, the machine room air conditioner needs to supply cold, namely, the room air conditioning system needs to operate in a heating mode, the machine room air conditioner needs to perform a coupling mode, at the moment, a cooling valve (9) is closed, a hot pipe valve (7) is opened, a second throttling device (10) is closed, a bypass valve (19) is closed, and the machine room air conditioning system forms a loop by a machine room compressor (1), a refrigeration condenser (2), a first throttling device (3), a gas distribution liquid storage device (4), a liquid pump (5), a one-way valve (11), a machine room evaporator (6), a hot pipe valve (7), a condensation evaporator (12) and a heat pipe condenser; the room air conditioning system comprises a room compressor (13), a four-way valve (14), an indoor heat exchanger (15), a third throttling device (16), a condensing evaporator (12), a fourth throttling device (17) and an outdoor heat exchanger (18) to form a heating loop;
when the outdoor temperature is higher than the set temperature T1 and less than or equal to the set temperature T2, the room does not need to supply heat, the machine room air conditioner needs to supply cold, namely, the room air conditioning system does not run, the machine room air conditioner needs to perform a coupling mode, at the moment, the refrigerating valve (8) is closed, the heat pipe valve (7) is opened, the second throttling device (10) is closed, and the machine room air conditioning system forms a loop by the machine room compressor (1), the refrigerating condenser (2), the first throttling device (3), the air distribution liquid storage device (4), the liquid pump (5), the one-way valve (11), the machine room evaporator (6), the heat pipe valve (7), the condensation evaporator (12) and the heat pipe condenser (8;
when the outdoor temperature T0 is less than or equal to the set temperature T1, a room needs to supply heat, a machine room air conditioner needs to supply cold, namely a room air conditioning system needs to operate a heating mode, the machine room air conditioner needs to perform a liquid-phase heat pipe mode, the cooling valve (9) is closed at the moment, the heat pipe valve (7) is opened, the first throttling device (3) and the second throttling device (10) are closed, and the machine room air conditioning system forms a loop by the air distribution liquid reservoir (4), the liquid pump (5), the one-way valve (11), the machine room evaporator (6), the heat pipe valve (7), the condensation evaporator (12) and the heat pipe condenser (8); the room air conditioning system comprises a room compressor (13), a four-way valve (14), an indoor heat exchanger (15), a third throttling device (16), a condensing evaporator (12), a fourth throttling device (17) and an outdoor heat exchanger (18) to form a heating loop.
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| CN111031759A (en) * | 2019-12-20 | 2020-04-17 | 漳州科华技术有限责任公司 | Machine room air conditioning device and control method |
| CN112954955B (en) * | 2021-01-25 | 2024-07-05 | 华为数字能源技术有限公司 | Cooling system and data center |
| CN115013955B (en) * | 2022-05-26 | 2023-04-14 | 深圳市艾特网能技术有限公司 | Natural cooling air conditioning system and control method of fan in natural cooling air conditioning system |
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