CN108488918B - A full-effect multi-mode energy-saving air conditioning system - Google Patents

A full-effect multi-mode energy-saving air conditioning system Download PDF

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Publication number
CN108488918B
CN108488918B CN201810381662.6A CN201810381662A CN108488918B CN 108488918 B CN108488918 B CN 108488918B CN 201810381662 A CN201810381662 A CN 201810381662A CN 108488918 B CN108488918 B CN 108488918B
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China
Prior art keywords
heat pipe
heat exchanger
working medium
heat
valve
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CN201810381662.6A
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CN108488918A (en
Inventor
范耀先
张士蒙
李磊
任群
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Phoenix Shanghai Environment Control Technology Co ltd
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Phoenix Shanghai Environment Control Technology Co ltd
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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • 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
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • 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
    • 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
    • F25B49/027—Condenser control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

The invention discloses a full-effect multi-mode energy-saving air conditioning system which comprises an outdoor host and an indoor unit, wherein the outdoor host comprises a refrigerating system and a heat pipe condensation section heat exchanger, the high-temperature side of the refrigerating system and the heat pipe condensation section heat exchanger are arranged in an air channel region, a first working medium channel and a second working medium channel which can exchange heat mutually are arranged in the refrigerating end heat exchanger, the first working medium channel is arranged in series in the refrigerating system, the second working medium channel is arranged in series in the heat pipe system, the indoor unit is at least one indoor heat pipe device, a liquid storage tank and a working medium pump are also arranged in the outdoor host, the heat pipe condensation section heat exchanger is communicated with a second working medium pipeline of the heat pipe system through a pipeline, and the heat pipe system using the refrigerating system and/or the heat pipe condensation section heat exchanger as a cold source is formed through the combination of opening and closing of a first cut-off valve and a second cut-off valve. The air conditioning system can provide multi-mode operation suitable for various different seasonal environments, and is more efficient and energy-saving.

Description

Full-effect multi-mode energy-saving air conditioning system
Technical Field
The present invention relates to an air conditioning system, and more particularly, to an air conditioning system suitable for a machine room environment.
Background
Along with the development of social informatization, the number of informatization facilities such as data centers and base stations with various scales is rapidly increased, and the heating value of various IT equipment is also multiplied, so that the refrigeration energy consumption of the precision air conditioner in the data center is the second most energy consumption project next to the IT equipment at present, and therefore, the energy-saving design significance of the precision air conditioner is great.
Unlike conventional comfortable air conditioner, the IT equipment and the auxiliary equipment of the data center room generate heat all the year round, no matter in winter or summer, the outdoor temperature is lower in winter or spring and autumn, the natural cooling method can be adopted, the outdoor environment can be used as a cold source to directly or indirectly cool the equipment of the room, and the compression refrigeration equipment with high energy consumption is replaced or assisted.
At present, the following natural cooling modes exist:
1. The principle of the air-air direct heat exchange (hereinafter referred to as air-air heat exchange) is shown in figure 1, the high-temperature machine room return air (such as 35 ℃) and the low-temperature fresh air (such as 15 ℃) are subjected to heat exchange in the plate heat exchanger, and the return air is sent into the machine room after being cooled (such as 23 ℃) to bear the indoor heat load.
The air heat exchanger has the advantages that heat source air and cold source air exchange directly, heat exchange efficiency is high, and the air heat exchanger has the defects that the unit and a connecting air duct are huge in volume and can only be installed at a position close to a machine room due to the fact that the specific heat capacity of the air is small (about 1.005kj/kg. ℃), huge air inlets are needed to be prefabricated on a wall surface or a roof, proper installation conditions cannot be provided for a machine room building, and the use situation is severely limited.
2. The method is most direct, but the data center has high requirements on stability and reliability, and the fresh air has a plurality of uncontrollable factors such as dust, acid gas, corrosive gas, humidity and the like, is directly fed into a machine room or is fed into the machine room after common filtering treatment, so that the method has a large risk and is rarely applied to practice.
3. The separated heat pipe is naturally cooled, and the main principle is that two heat exchangers, i.e. an indoor heat exchanger and an outdoor heat exchanger, are respectively used as an evaporation side and a condensation side of the heat pipe and are connected through a pipeline to form a closed space, and a low-boiling-point refrigerant (such as R22, R410a, R134a and the like) is generally filled into the cavity to be used as a heat pipe working medium, so that the heat pipe is widely applied to an outdoor cabinet at present, and the circulating resistance of the working medium is overcome by utilizing gravity. As shown in fig. 2.
The heat exchange device has the advantages of being capable of being installed in a separated mode, free of huge air duct connection, strict installation distance and height difference limit value exist because of no mechanical power circulation, and the heat exchange device is general in heat exchange efficiency and can only be used for auxiliary energy saving application.
In summary, the existing common natural cooling method includes a plurality of problems, and the natural cold source cannot be utilized stably and efficiently.
On the one hand, the existing scheme has various defects, on the other hand, the research on the natural working medium refrigerant which is more environment-friendly is in progress, if R744 (namely CO 2) with various advantages cannot be widely applied due to the critical temperature and the working pressure, and therefore, a novel energy-saving air conditioning unit which can solve the problems and realize the application of new working medium is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a more full-efficiency energy-saving air conditioning system which operates in a multi-mode and is suitable for various different seasonal environments.
In order to solve the technical problem, the invention adopts the following technical scheme:
The full-effect multi-mode energy-saving air conditioning system comprises an outdoor host and an indoor unit, wherein the outdoor host comprises a complete set of refrigerating system and a heat pipe condensing section heat exchanger, and the space function area of the outdoor host is divided into a host area and a wind channel area;
The refrigeration system comprises a high-temperature side and a low-temperature side, and the low-temperature side is a refrigeration end heat exchanger;
The high temperature side of the refrigerating system and the heat pipe condensation section heat exchanger are arranged in the air channel region and can exchange heat with cold air in the cold air channel, wherein the cold air refers to air flow formed by outdoor air in the cold air channel, and the temperature of the cold air is lower than that of the condenser and the heat pipe condensation section heat exchanger, so that the cold air is called cold air.
The refrigerating end heat exchanger is internally provided with a first working medium channel and a second working medium channel which can exchange heat mutually, the first working medium channel is provided with a first working medium channel inlet and a first working medium channel outlet, and the second working medium channel is provided with a second working medium channel inlet and a second working medium channel outlet;
The indoor unit is at least one indoor heat pipe device, and the indoor heat pipe device comprises a heat pipe evaporation section heat exchanger and an indoor heat pipe fan;
The outdoor host is internally provided with a liquid storage tank and a working medium pump, wherein the outlet of the liquid storage tank is communicated with the inlet of the working medium pump, the inlet of the liquid storage tank is communicated with the second working medium outlet of the refrigeration end heat exchanger through a first heat pipe pipeline, the outlet of the working medium pump is communicated with the working medium inlet of the heat pipe evaporation section heat exchanger in the indoor heat pipe device, and the working medium outlet of the heat pipe evaporation section heat exchanger in the indoor heat pipe device is communicated with the second working medium inlet of the refrigeration end heat exchanger through a second heat pipe pipeline;
the working medium inlet of the heat pipe condensation section heat exchanger is communicated with the second heat pipe pipeline through a third heat pipe pipeline, and a first heat pipe three-way point is formed at the joint of the working medium inlet and the second heat pipe pipeline; the working medium outlet of the heat pipe condensation section heat exchanger is communicated with the second heat pipe through a fourth heat pipe, a second heat pipe three-way point is formed at the joint of the working medium outlet of the heat pipe condensation section heat exchanger and the second heat pipe, and a first cut-off valve is arranged on the second heat pipe in series between the first heat pipe three-way point and the second heat pipe three-way point;
when the first cut-off valve is opened and the second cut-off valve is closed, a heat transmission system (i.e. a heat pipe system) between the outdoor host and the indoor unit using the refrigeration system is formed by the heat pipe evaporation section heat exchanger, the refrigeration end heat exchanger, the liquid storage tank and the working medium pump;
When the first cut-off valve is closed and the second cut-off valve is opened, a heat transfer system (i.e. a heat pipe system) between the outdoor host computer and the indoor unit using the heat pipe condensing section heat exchanger is formed by the heat pipe evaporating section heat exchanger, the heat pipe condensing section heat exchanger, the liquid storage tank and the working medium pump;
When the first and second shut-off valves are closed at the same time, a heat transfer system (i.e. a heat pipe system) between the outdoor host and the indoor unit, which simultaneously uses the refrigeration system and the heat pipe condensing section heat exchanger, is formed by the heat pipe evaporating section heat exchanger, the heat pipe condensing section heat exchanger, the refrigeration end heat exchanger, the liquid storage tank and the working medium pump.
And the second working medium circulates in the heat transmission system.
The refrigerating system comprises a compressor, a condenser, an expansion valve and a refrigerating end heat exchanger which are serially arranged in sequence, wherein the condenser is arranged on the high temperature side of the refrigerating system, the compressor is provided with an exhaust port and an air return port, the inlet of the first working medium channel is communicated with the expansion valve, and the outlet of the first working medium channel is communicated with the air return port of the compressor.
Further, in the cold air channel, the heat pipe condensation section heat exchanger and the condenser are sequentially arranged along the direction from the air inlet of the external machine to the external fan, a first side ventilation valve is arranged beside the heat pipe condensation section heat exchanger, and the heat pipe condensation section heat exchanger and the first side ventilation valve can separate the two side spaces of the cold air channel;
When the first cut-off valve is opened and the second cut-off valve is closed, simultaneously, the first side ventilation valve is opened and the second side ventilation valve is closed, cold air entering from the air inlet of the external machine mainly passes through the first side ventilation valve and then continuously passes through the condenser to complete heat exchange, namely, most cold air passes through the first side ventilation valve with smaller wind resistance, and a small part of cold air passes through the heat pipe condensation section heat exchanger;
When the first cut-off valve is closed and the second cut-off valve is opened, simultaneously, the second side ventilation valve is opened and the first side ventilation valve is closed, and cold air entering from the air inlet of the external machine is mainly discharged through the second side ventilation valve after heat exchange of the heat pipe condensation section heat exchanger;
when the first cut-off valve and the second cut-off valve are closed at the same time, the first side ventilation valve and the second side ventilation valve are closed at the same time, and cold air entering from the air inlet of the external machine firstly exchanges heat through the heat pipe condensation section heat exchanger and then exchanges heat through the condenser.
Further, the second working medium is R744.
More preferably, a heat regenerator is further provided, a first heat recovery pipeline and a second heat recovery pipeline which can exchange heat are arranged in the heat regenerator, the first heat recovery pipeline is arranged on a pipeline between an exhaust port of the compressor and the condenser in series, and the second heat recovery pipeline is arranged on a pipeline between a first working medium channel outlet of the refrigeration end heat exchanger and a return air port of the compressor in series.
Further, a check valve is further connected in series between the first heat return pipe and the exhaust port of the compressor, and backflow from the first heat return pipe to the compressor is prohibited.
Further, a spraying device is arranged at the initial section of the air passage area of the outdoor host close to the air inlet of the outdoor host, the spraying device is arranged in front of the condenser and the heat pipe condensation section heat exchanger along the ventilation direction, the spraying device comprises a water storage box, a booster water pump, an atomizing nozzle and a water tray, the water storage box is connected with a water supply pipeline through a water supplementing valve, the atomizing nozzle is communicated with the water storage box through the booster water pump, and the water tray is arranged below the atomizing nozzle and connected with the water storage box, and is collected with redundant water drops and then is collected into the water storage box again.
Further, the first and second cut-off valves are electromagnetic valves.
The full-effect multi-mode air conditioning system has ingenious structure, firstly, the air conditioning system is separated into a refrigerating system of an outdoor host machine and a heat pipe type heat transmission system between the outdoor host machine and an indoor machine, and through the separation, environment-friendly refrigerant working media can be used in long-distance air conditioning system working media pipelines, so that the adaptability and the environment friendliness of the system to various environments are greatly improved. The invention skillfully sets the condensing section of the heat pipe type heat transmission system to be freely switched between three condensing modes of a refrigerating system mode and/or a natural air cooling mode so as to adapt to environmental changes in different seasons to obtain optimal energy utilization and use efficiency of an air conditioner. The air conditioning system provided by the invention has the normal refrigeration function and the function of fully utilizing the outdoor natural cold source when the air temperature is low, is particularly suitable for application occasions requiring annual refrigeration, such as a data center, a precise machine room and the like, and meets the modern industrial development concept of energy conservation and emission reduction.
In order to improve the working efficiency of the cold air channel matched with three condensing modes, the invention further optimizes the structure of the cold air channel, skillfully sets the first and second side ventilation valves to be respectively matched with the heat pipe condensing section heat exchanger and the condenser to form secondary air channel isolation for separating the cold air channel, and matches the switching of the three condensing modes through different opening and closing combination modes of the first and second side ventilation valves so as to ensure that the cold air channel achieves optimal use efficiency.
Furthermore, the air entering the cold air channel of the outdoor host machine can be cooled firstly and then subjected to heat exchange through the heat pipe condensation section heat exchanger or the condenser by arranging the spraying device at the initial section of the air channel area of the outdoor host machine, which is close to the air inlet of the outdoor host machine, so that the intensity and the efficiency of heat exchange of the condensation section are higher.
The air conditioning system of the invention has the main advantages that:
1. The outdoor cold source has high utilization rate, no matter whether the refrigerating system is started or not, the heat can be exchanged as long as the outdoor air temperature is lower than the temperature of the second working medium of the heat pipe system, and the natural cold source can be fully utilized.
2. The indoor and outdoor connection of the heat pipe system is simple, and the common oil return problem of the refrigeration system is not needed to be considered.
3. The heat pipe system can also adopt various phase-change working media, the selection of the working media is very free, compared with a fluorine pump air conditioning unit, the heat pipe system does not need to consider a plurality of harsh requirements of a compressor in a shared system, such as high and low pressure saturation temperature, compression ratio, refrigerant oil solubility, extremely high cleanliness and the like, so the heat pipe system can search for natural working media which are more environment-friendly and have low cost, and takes a natural working medium R744 (namely CO 2) as an example, if the heat pipe system is used for a conventional compression refrigeration system, CO 2 has the defects of low critical temperature (31.1 ℃) and high working pressure, but the heat pipe system does not have a compressor boosting process, and the temperature of the refrigerant in operation is generally below 20 ℃ and can work in a two-phase region well.
If applied to a heat pipe system, CO 2 has incomparable advantages with other refrigerants, such as:
a. The environment-friendly and cheap CO 2 is a natural working medium, the ozone attenuation index odp=0 and the greenhouse index gwp=1.
B. the latent heat of evaporation is large, the refrigerating capacity per unit volume is large, for example, at 0 ℃, the refrigerating capacity per unit volume is 5.12 times of that of R22 refrigerant and 8.25 times of that of R12. Thus, the volume of the pipeline and the filling quantity can be greatly reduced.
C. the kinematic viscosity is low. For example, the kinematic viscosity at 0 ℃ is only 5.2% of R717 and 23.8% of R12, and the pipe diameter can be further reduced and the flow rate can be improved on the premise of not increasing the pressure drop.
D. The heat conductivity coefficient is high, and the volume of the heat exchanger can be reduced.
4. The pipeline installation of the heat pipe system is simpler, and because the system is not provided with high-precision components such as a compressor, an expansion valve and the like and refrigerating oil with strong hygroscopicity, the process requirement is simplified, and additional elbows such as an oil storage elbow and the like are not required to be installed.
5. The convenience of installation makes the applicability better, and compared with air-air heat exchange, huge air duct connection is not needed any more, and a heat exchange unit with a weight of tens of tons does not have high wind resistance of an air-air plate type heat exchanger.
6. The refrigerating system is integrated, and the working procedures of assembling parts, vacuumizing, adding refrigerant and the like are all carried out in a factory, so that the reliability and the stability of the refrigerating system are greatly improved, common engineering installation defects such as oxidation impurities in a pipe, incomplete vacuumizing, inaccurate refrigerant filling amount and the like caused by welding leakage and insufficient oxidation prevention of welding are eliminated, and the efficiency of the refrigerating system is prevented from being reduced and the failure rate is improved.
7. The conventional machine room air conditioner generally places a refrigerating part such as a compressor and the like in an indoor unit, and a condenser in the outdoor. The air conditioning system adopts a natural cooling mode, so that the compressor does not need to be started in low-temperature seasons, and therefore, the refrigerating components such as the compressor and the like are all arranged in the outdoor unit, the problems of low-temperature starting, refrigerant migration and the like are not needed to be considered, and the indoor unit only needs to be composed of a heat exchanger and a fan, so that the unit volume can be reduced, and the precious machine room area is saved.
8. The refrigerating system is integrated and placed in the outdoor unit, so that reliability and efficiency are improved, the number of times of air conditioner maintenance in a machine room is greatly reduced, and the stability of the environment of the machine room is guaranteed.
9. The outdoor host can realize the modularized assembly effect, for example, two or more outdoor hosts are combined and share the same heat pipe system, so that the decentralized transportation and installation are realized, and the system can be simplified and the pipelines are reduced.
10. The indoor tail end of the heat transmission system (heat pipe system) is flexible in design, and can be in various forms such as a cabinet type, a row room, a suspended ceiling, a box type, a cooling backboard and the like, so that the requirements of different occasions are met.
11. The outdoor main machine has a switching function of the air valve, so that the condenser and the heat pipe condensation section heat exchanger can share one set of fan without increasing the resistance energy consumption of the fan.
12. The outdoor host machine can also have a spray humidification function, so that the temperature of the outdoor air inlet dry bulb is reduced, the energy consumption is further saved, and the range of utilizing the natural cold source is expanded.
Drawings
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below, wherein:
fig. 1 is a schematic structural view of an air conditioner for direct air-to-air heat exchange in the prior art.
Fig. 2 is a schematic structural diagram of a split type heat pipe air conditioner in the prior art.
Fig. 3 is a schematic structural diagram of the full-effect multi-mode energy-saving air conditioning system of the present invention.
Fig. 4a is a schematic diagram of the second working medium circulation when the first electromagnetic valve is opened and the second electromagnetic valve is closed, wherein the thick line is a pipeline for the second working medium circulation.
Fig. 4b is a schematic view of the cool air passage air flow path when the first side vent valve is opened and the second side vent valve is closed.
Fig. 5a is a schematic diagram of the second working medium circulation when the first electromagnetic valve is closed and the second electromagnetic valve is opened, wherein the thick line is a pipeline for the second working medium circulation.
Fig. 5b is a schematic view of the cool air passage air flow path when the first side vent valve is closed and the second side vent valve is opened.
Fig. 6a is a schematic diagram of the second working medium circulation when the first electromagnetic valve and the second electromagnetic valve are closed simultaneously, wherein the thick line is a pipeline for the second working medium circulation.
Fig. 6b is a schematic view of the cool air passage air flow path when the first side vent valve and the second side vent valve are closed simultaneously.
Fig. 7 is a schematic view of an air conditioning system provided with a spraying device.
In the figure:
100. Outdoor host
1. Heat pipe condensation section heat exchanger 2, external machine air inlet 3 and external fan
4. Compressor 5, condenser 6 and expansion valve
7. Cold-making end heat exchanger
71. First working fluid channel inlet 72 and first working fluid channel outlet
73. Second working fluid channel inlet 74, second working fluid channel outlet
200. Indoor heat pipe device
8. Heat exchanger 9 of heat pipe evaporation section, indoor heat pipe fan 10 and liquid storage tank
11. Working medium pump 12, first heat pipe 13 and second heat pipe
14. Third heat pipe 15, fourth heat pipe
101. First heat pipe three-way point 102 and second heat pipe three-way point
16. First electromagnetic valve 17, fifth heat pipe 18, second electromagnetic valve
19. Regenerator 20, first side vent valve 21, second side vent valve
22. Spraying device 23, one-way valve
221. Water storage box 222, booster pump 223 and atomizer
224. Water pan 225 and water supplementing valve
Detailed Description
The invention is described in further detail below with reference to the attached drawings and examples:
Fig. 3 shows a full-effect multi-mode energy-saving air conditioning system, which comprises an outdoor host 100 and an indoor unit, wherein the outdoor host 100 comprises a complete set of refrigerating system and a heat pipe condensing section heat exchanger 1, a space function area of the outdoor host 100 is divided into a host area and a wind channel area, an outer machine air inlet 2 is arranged on an outer shell of the outdoor host 100, which is close to the host area, of the wind channel area, an outer fan 3 is arranged at the tail end, which is far away from the host area, of the wind channel area, and a cold air channel of the outdoor host 100 is formed from the outer machine air inlet 2 to the outer fan 3.
The refrigeration system comprises a compressor 4, a condenser 5, an expansion valve 6 and a refrigeration end heat exchanger 7 which are sequentially connected in series, wherein the refrigeration system adopts a conventional compression refrigeration method, the system is filled with refrigerant, the refrigeration end heat exchanger 7 plays a role of an evaporation heat exchanger in the refrigeration system, various heat exchanger types can be adopted, including but not limited to shell-and-tube type, sleeve type, plate type heat exchangers and the like, and the compressor is provided with an exhaust port and a return port.
The condenser 5 and the heat pipe condensation section heat exchanger 1 are arranged in the air channel region and can exchange heat with cold air in the cold air channel, wherein the cold air is air flow formed by outdoor air in the cold air channel, and the temperature of the cold air is lower than that of the condenser 5 and the heat pipe condensation section heat exchanger 1, so the cold air is called cold air.
The refrigerating end heat exchanger is internally provided with a first working medium channel and a second working medium channel which can exchange heat mutually, the first working medium channel is provided with a first working medium channel inlet 71 and a first working medium channel outlet 72, the second working medium channel is provided with a second working medium channel inlet 73 and a second working medium channel outlet 74, the first working medium circulates in the refrigerating system, the first working medium channel inlet 71 is communicated with the expansion valve 6, and the first working medium channel outlet 72 is communicated with a return air port of the compressor 4.
The indoor unit is at least one indoor heat pipe device 200, and the indoor heat pipe device 200 comprises a heat pipe evaporation section heat exchanger 8 and an indoor heat pipe fan 9;
The outdoor host 100 is also internally provided with a liquid storage tank 10 and a working medium pump 11, wherein the outlet of the liquid storage tank 10 is communicated with the inlet of the working medium pump 11, the inlet of the liquid storage tank 10 is communicated with the second working medium outlet 74 of the refrigeration end heat exchanger 7 through a first heat pipe pipeline 12, the outlet of the working medium pump 11 is communicated with the working medium inlet of the heat pipe evaporation section heat exchanger 8 in the indoor heat pipe device 200, and the working medium outlet of the heat pipe evaporation section heat exchanger 8 in the indoor heat pipe device 200 is communicated with the second working medium inlet 73 of the refrigeration end heat exchanger 7 through a second heat pipe pipeline 13.
The working medium inlet of the heat pipe condensation section heat exchanger 1 is communicated with the second heat pipe pipeline 13 through a third heat pipe pipeline 14, and a first heat pipe three-way point 101 is formed at the joint of the working medium inlet and the second heat pipe pipeline, the working medium outlet of the heat pipe condensation section heat exchanger 1 is communicated with the second heat pipe pipeline 13 through a fourth heat pipe pipeline 15, and a second heat pipe three-way point 102 is formed at the joint of the working medium outlet and the second heat pipe pipeline, a first electromagnetic valve 16 is arranged on the second heat pipe pipeline 13 in series between the first heat pipe three-way point 101 and the second heat pipe three-way point 102, and a second electromagnetic valve 18 is arranged on the second heat pipe pipeline 13 in series between the second heat pipe three-way point 102 and the second working medium inlet 73 of the refrigerating end heat exchanger 7 and the first heat pipe pipeline 12 through a fifth heat pipe pipeline 17;
The refrigeration principle of the refrigeration system is that the refrigerant in a gas-liquid two-phase state is evaporated, absorbed and refrigerated in the refrigeration end heat exchanger 7, the refrigerant gas with low temperature and low pressure is sucked and boosted by the compressor 4 to become high-temperature and high-pressure refrigerant gas, then enters the condenser 5 to release heat at equal pressure and then become high-pressure liquid, and the refrigerant liquid is throttled and depressurized by the expansion valve 6 and then enters the refrigeration end heat exchanger 7 again to be evaporated and refrigerated, and the circulation is performed.
More preferably, the air conditioning system is further provided with a heat regenerator 19, a first heat regeneration pipeline and a second heat regeneration pipeline which can exchange heat between the two heat regeneration pipelines are arranged in the heat regenerator 19, the first heat regeneration pipeline is connected in series to the pipeline between the air outlet of the compressor 4 and the condenser 5, and the second heat regeneration pipeline is connected in series to the pipeline between the first working medium channel outlet 72 of the refrigeration end heat exchanger 7 and the air return port of the compressor 4.
The heat regenerator is adopted because the heat exchanger at the refrigeration end adopts a high-efficiency heat exchange mode, the heat exchange temperature difference between the refrigerant serving as the first working medium and the second working medium is smaller, the heat exchange temperature is not suitable to be large, the heat regenerator is adopted to ensure that the suction air has a certain degree of superheat for avoiding the liquid impact of the compressor, and the effect of exhausting and precooling is also achieved. In addition, the system has higher evaporation temperature, and the condition that the temperature difference between the air suction temperature and the liquid pipe temperature is not large occurs in transitional seasons is considered, so that the unique exhaust heat recovery is adopted instead of the traditional liquid pipe heat recovery.
In the cold air channel, the heat pipe condensation section heat exchanger 1 and the condenser 5 are sequentially arranged along the direction from the air inlet 2 of the external machine to the external fan 3, a first side ventilation valve 20 is arranged at the side of the heat pipe condensation section heat exchanger 1, and the heat pipe condensation section heat exchanger 1 and the first side ventilation valve 20 can separate the two side spaces of the cold air channel;
there are three cases of heat dissipation at the outdoor host:
1. when the outdoor temperature is higher (such as 22 ℃), the system can not directly utilize outdoor air for cooling, a refrigeration system is required to be used as a cold source, and the second working medium is condensed in the refrigeration end heat exchanger 7 without passing through the heat pipe condensation section heat exchanger 1. The refrigerating system starts refrigerating, and the heat of the heat transmission system (namely the heat pipe system) is transmitted to the refrigerating system through the refrigerating end heat exchanger 7, so that the cooling effect is realized.
As shown in fig. 4a, when the first solenoid valve 16 is opened and the second solenoid valve 18 is closed, a heat transfer system (i.e., a heat pipe system) between the outdoor unit 100 and the indoor unit using the refrigeration system is formed by the heat pipe evaporation section heat exchanger 8, the refrigeration side heat exchanger 7, the liquid storage tank 10 and the working medium pump 11. The second working medium (CO 2) only enters the refrigeration end heat exchanger 7 for condensation (the second working medium cannot pass through the heat pipe condensation section heat exchanger 1 because of high pressure and resistance in the heat pipe condensation section heat exchanger 1).
Meanwhile, as shown in fig. 4b, the air flow path of the cold air channel is shown as a first side ventilation valve 20, a second side ventilation valve 21 is closed, cold air entering from the air inlet 2 of the external machine mainly passes through the first side ventilation valve 20 and then continuously passes through the condenser 5 to complete heat exchange, namely, most of cold air passes through the first side ventilation valve 20 with smaller wind resistance, and a small part of cold air passes through the heat pipe condensation section heat exchanger 1 (only passes through but does not exchange heat), so that the total air flow sectional area is increased, the wind resistance is effectively reduced, and the energy consumption of the air blower is saved. The second side vent valve 21 is closed at this point, allowing the entire flow of air to pass through the condenser 5 of the refrigeration system.
The phase change heat exchange isothermal property and the heat conduction property of the second working medium (CO 2) are utilized, and the heat exchange temperature difference between the indoor coil and the refrigerating end heat exchanger 7 is maintained at a lower level, so that the refrigerating system can operate at a higher evaporating temperature with high efficiency, long piping loss and non-standard loss of field installation and evacuation filling are avoided due to the integrated design of the refrigerating system, and the problems of oil return, low temperature and the like are not considered, so that the refrigerating system is more efficient and reliable.
2. When the outdoor temperature is lower (for example, below 10 ℃), the system can directly use the outdoor air as a low-temperature cold source, the refrigerating system is closed at the moment, and the second working medium in the heat pipe system is directly condensed in the heat pipe condensing section heat exchanger 1. In the mode, only a small amount of energy consumption of a fan and a working medium pump is needed, and the energy is saved at most.
As shown in fig. 5a, when the first electromagnetic valve 16 is closed and the second electromagnetic valve 18 is opened, a heat transfer system (i.e., a heat pipe system) between the outdoor host 100 and the indoor unit using the heat pipe condensing unit heat exchanger 1 is formed by the heat pipe evaporating unit heat exchanger 8, the heat pipe condensing unit heat exchanger 1, the liquid storage tank 10 and the working medium pump 11;
Meanwhile, as shown in fig. 5b, the air flow path of the cold air channel is shown as a second side ventilation valve 21, a first side ventilation valve 20 is closed, cold air entering from the air inlet 2 of the external machine exchanges heat through the heat pipe condensation section heat exchanger 1, heat in the heat pipe system is taken away, and then the cold air is mainly discharged through the second side ventilation valve 21, and because the condenser 5 is not closed, fin gaps of the cold air channel still can pass through air flow, a part of air also flows through the condenser 5 (only passes through but does not exchange heat, and because the refrigerating system is closed), so that the total air flow cross section is enlarged, and the wind resistance is reduced.
3. When the air temperature is in the transitional season, the outdoor air temperature is just insufficient to discharge all heat, and the refrigeration system is required to assist in heat dissipation. The second working medium firstly enters the heat pipe condensation section heat exchanger for precooling and then passes through the refrigeration end heat exchanger 7 for continuous condensation.
As shown in fig. 6a, when the first and second solenoid valves 16 and 18 are simultaneously closed, a heat transfer system (i.e., a heat pipe system) between the outdoor unit 100 and the indoor unit using the refrigeration system and the heat pipe condensing unit heat exchanger 1 simultaneously is formed by the heat pipe evaporating unit heat exchanger 8, the heat pipe condensing unit heat exchanger 1, the refrigeration side heat exchanger 7, the liquid storage tank 10 and the working medium pump 11.
Meanwhile, as shown in fig. 6b, the air flow path of the cold air channel is closed by the first side ventilation valve 20 and the second side ventilation valve 21, and the cold air entering from the air inlet 2 of the external machine exchanges heat through the heat pipe condensation section heat exchanger 1 and then exchanges heat through the condenser 5.
In the mode, outdoor air always flows through the heat pipe condensation section heat exchanger 1, an outdoor cold source can be fully utilized to the greatest extent, the heat pipe condensation section heat exchanger recovers cold in fresh air and can cause air heating, but the temperature difference in transitional seasons is smaller, so that the heating is limited, and the original air inlet temperature is much lower than the standard working condition, so that the influence on a refrigerating system is avoided after the heating. In fact, in order to prevent the condensation pressure from being too low when the conventional machine room air conditioner is operated in the transitional season, the condensation effect must be restrained by adopting a method of reducing the speed of the forced air blower, so that the design of the air flow path of the mode is quite ingenious and effective.
The heat transmission system (heat pipe system) circulates a second working medium, wherein the second working medium is R744 (namely CO 2 working medium).
The refrigerating principle of the heat pipe system is that the indoor heat pipe fan 9 enables air in a machine room to be forced to circulate, continuously flows through the heat pipe evaporation section heat exchanger 8, and liquid CO 2 in a coil pipe evaporates and absorbs heat, so that the temperature of the air is reduced, and a refrigerating effect is generated. And gaseous CO 2 enters the refrigeration side heat exchanger 7 and/or the heat pipe condensing section heat exchanger 1 in the outdoor unit 100 via a pipe. The CO 2 is condensed into liquid and then enters the liquid storage tank 10, then enters the working medium pump 11, and the working medium pump 11 with extremely low power consumption conveys the liquid CO 2 to the indoor tail end (namely, the coil of the heat pipe evaporation section heat exchanger 8 of the indoor heat pipe device 200), so that the cycle is repeated.
The second working medium can also be used for various phase-change working media besides the CO 2 working medium, such as the conventional phase-change refrigerant working media R410A, R, R134a and the like.
Of course, the air flow path structure management design of the first and second side ventilation valves 16 and 18 in the cold air channel of the outdoor host 100 may be designed according to different specific environments and design ideas, and even the side ventilation valves may not be provided, so long as the refrigeration system and/or the heat pipe system can be switched to be used as a cold source through the first and second electromagnetic valves, and the heat pipe condensation section heat exchanger 1 and the condenser 5 can work normally in the cold air channel.
Further, in order to avoid the backflow from the first heat recovery line to the compressor, a check valve 23 may be further provided in series between the first heat recovery line and the exhaust port of the compressor.
In order to further save energy consumption and expand the range of utilizing natural cold sources, a spraying device 22 is arranged at the initial section of the air channel area of the outdoor host 100, which is close to the air inlet 2 of the outdoor host, as shown in fig. 7, the spraying device 22 is arranged in front of the condenser 5 and the heat pipe condensation section heat exchanger 1 along the ventilation direction, the spraying device 22 comprises a water storage box 221, a booster pump 222, an atomizing nozzle 223 and a water tray 224, the water storage box 221 is connected with a water supply pipeline through a water supplementing valve 225, the atomizing nozzle 223 is communicated with the water storage box 221 through the booster pump 222, and the water tray 224 is arranged below the atomizing nozzle 223 and is connected with the water storage box 221, and after collecting redundant water drops, the water drops are collected into the water storage box 221 again.
In the natural cooling or mixing mode, the humidifying function can obviously reduce the air inlet temperature, and in the refrigeration mode, the humidifying function can obviously reduce the high pressure of the refrigeration system, and the compressor energy consumption is saved.
This function expands the temperature range using the outdoor heat sink, and is briefly described as follows:
Spray humidification (or wet film humidification) is known as an isenthalpic humidification cooling process. The available outdoor temperature range of the unit without humidifying function is set to be <22 ℃, the outdoor air relative humidity is set to be 50%, and the air inlet relative humidity can be increased to 90% by spray humidifying.
The air state point after humidification was found to be dry bulb temperature=22℃, and enthalpy value=60.2 kj/kg.
The air inlet state point can be obtained by the enthalpy value and the relative humidity, and the dry bulb temperature is 28.6 ℃.
That is, with an air relative humidity of 50%, its temperature utilization range can be increased to <28.6 ℃. Better utilization results are obtained if the weather is dry.
In the refrigeration mode, the condensing temperature is reduced by 6.6 ℃ approximately, and the energy consumption of the compressor is reduced to 87% of the original energy consumption.
Of course, the use of humidification has its limitations, water resources are consumed and the use of the humidification in dry climates is necessary, and the spraying device 22 may not be provided depending on the use environment and design.
The refrigerating system can also adopt other refrigerating modes such as adsorption type, magnetic refrigerating, absorption type and the like, so long as the refrigerating system has the function of realizing the non-spontaneous transfer of heat from the low temperature side to the high temperature side through the input of energy (electric energy or heat energy and the like). As long as the low temperature side in the refrigeration system is the refrigeration end heat exchanger 7, the high temperature side of the refrigeration system and the heat pipe condensation section heat exchanger 1 are arranged in the air passage area and can exchange heat with cold air in the cold air passage, and the first working medium passage of the refrigeration end heat exchanger 7 is connected in series in a pipeline of the refrigeration system to be used as the low temperature side of the refrigeration system.
The electromagnetic valve can also be other conventional shut-off valves, so long as the on-off state of the working medium flow channel of the pipeline at the switching position can be controlled by opening and closing the shut-off valve, and even the shut-off valve can be controlled manually.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. The full-effect multi-mode energy-saving air conditioning system comprises an outdoor host and an indoor unit, and is characterized in that the outdoor host comprises a complete set of refrigerating system and a heat pipe condensing section heat exchanger, wherein the space function area of the outdoor host is divided into a host area and a wind channel area;
The refrigeration system comprises a high-temperature side and a low-temperature side, and the low-temperature side is a refrigeration end heat exchanger;
the high-temperature side of the refrigerating system and the heat exchanger of the heat pipe condensation section are arranged in the air channel region and can exchange heat with cold air in the cold air channel;
The refrigerating end heat exchanger is internally provided with a first working medium channel and a second working medium channel which can exchange heat mutually, the first working medium channel is provided with a first working medium channel inlet and a first working medium channel outlet, and the second working medium channel is provided with a second working medium channel inlet and a second working medium channel outlet;
The indoor unit is at least one indoor heat pipe device, and the indoor heat pipe device comprises a heat pipe evaporation section heat exchanger and an indoor heat pipe fan;
The outdoor host is internally provided with a liquid storage tank and a working medium pump, wherein the outlet of the liquid storage tank is communicated with the inlet of the working medium pump, the inlet of the liquid storage tank is communicated with the second working medium outlet of the refrigeration end heat exchanger through a first heat pipe pipeline, the outlet of the working medium pump is communicated with the working medium inlet of the heat pipe evaporation section heat exchanger in the indoor heat pipe device, and the working medium outlet of the heat pipe evaporation section heat exchanger in the indoor heat pipe device is communicated with the second working medium inlet of the refrigeration end heat exchanger through a second heat pipe pipeline;
the working medium inlet of the heat pipe condensation section heat exchanger is communicated with the second heat pipe pipeline through a third heat pipe pipeline, and a first heat pipe three-way point is formed at the joint of the working medium inlet and the second heat pipe pipeline; the working medium outlet of the heat pipe condensation section heat exchanger is communicated with the second heat pipe through a fourth heat pipe, a second heat pipe three-way point is formed at the joint of the working medium outlet of the heat pipe condensation section heat exchanger and the second heat pipe, and a first cut-off valve is arranged on the second heat pipe in series between the first heat pipe three-way point and the second heat pipe three-way point;
When the first cut-off valve is closed and the second cut-off valve is opened, the heat transmission system between the outdoor host machine and the indoor machine using the heat pipe condensing section heat exchanger is formed by the heat pipe evaporating section heat exchanger, the heat pipe condensing section heat exchanger, the liquid storage tank and the working medium pump;
when the first and second cut-off valves are closed at the same time, a heat transfer system between the outdoor host and the indoor unit, which simultaneously uses a refrigerating system and a heat pipe condensing section heat exchanger, is formed by the heat pipe evaporating section heat exchanger, the heat pipe condensing section heat exchanger, the refrigerating end heat exchanger, the liquid storage tank and the working medium pump;
the second working medium circulates in the heat transmission system;
The refrigerating system comprises a compressor, a condenser, an expansion valve and a refrigerating end heat exchanger which are serially arranged in sequence, wherein the condenser is arranged on the high temperature side of the refrigerating system;
In the cold air channel, the heat pipe condensation section heat exchanger and the condenser are sequentially arranged along the direction from the air inlet of the external machine to the external fan, a first side ventilation valve is arranged at the side of the heat pipe condensation section heat exchanger, and the heat pipe condensation section heat exchanger and the first side ventilation valve can separate the two side spaces of the cold air channel;
When the first cut-off valve is opened and the second cut-off valve is closed, simultaneously opening a first side ventilation valve and closing a second side ventilation valve, and enabling cold air entering from an air inlet of the external machine to pass through the first side ventilation valve and then pass through a condenser to complete heat exchange;
When the first cut-off valve is closed and the second cut-off valve is opened, simultaneously, the second side ventilation valve is opened and the first side ventilation valve is closed, and cold air entering from the air inlet of the external machine is mainly discharged through the second side ventilation valve after heat exchange of the heat pipe condensation section heat exchanger;
when the first cut-off valve and the second cut-off valve are closed at the same time, the first side ventilation valve and the second side ventilation valve are closed at the same time, and cold air entering from the air inlet of the external machine firstly exchanges heat through the heat pipe condensation section heat exchanger and then exchanges heat through the condenser.
2. The air conditioning system of claim 1, wherein the second working fluid is R744.
3. The air conditioning system according to claim 1 or 2, further comprising a regenerator, wherein a first regenerative pipe and a second regenerative pipe capable of exchanging heat with each other are disposed in the regenerator, the first regenerative pipe is connected in series to a pipe between the air outlet of the compressor and the condenser, and the second regenerative pipe is connected in series to a pipe between the air return port of the compressor and the first working medium channel outlet of the refrigeration side heat exchanger.
4. The air conditioning system according to claim 3, wherein a check valve is further provided in series between the first regenerative pipe and the exhaust port of the compressor, and a reverse flow from the first regenerative pipe to the compressor is prohibited.
5. The air conditioning system according to claim 1 or 2, wherein a spraying device is arranged at an initial section of the air passage area of the outdoor host close to the air inlet of the outdoor host, the spraying device is arranged in front of the condenser and the heat pipe condensation section heat exchanger along the ventilation direction, the spraying device comprises a water storage box, a booster water pump, an atomizing nozzle and a water tray, the water storage box is connected with a water supply pipeline through a water supplementing valve, the atomizing nozzle is communicated with the water storage box through the booster water pump, the water tray is arranged below the atomizing nozzle and is connected with the water storage box, and the water tray is collected with redundant water drops and then is collected into the water storage box again.
6. The air conditioning system according to claim 3, wherein a spraying device is arranged at an initial section of the air passage area of the outdoor host close to the air inlet of the outdoor host, the spraying device is arranged in front of the condenser and the heat pipe condensation section heat exchanger along the ventilation direction, the spraying device comprises a water storage box, a booster water pump, an atomizing nozzle and a water tray, the water storage box is connected with a water supply pipeline through a water supplementing valve, the atomizing nozzle is communicated with the water storage box through the booster water pump, the water tray is arranged below the atomizing nozzle and is connected with the water storage box, and redundant water drops are collected and then are collected into the water storage box again.
7. The air conditioning system according to claim 1 or 2, wherein the first and second shut-off valves are solenoid valves.
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