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CN114877407B - Air conditioning system, data room temperature adjustment system and temperature control method - Google Patents

Air conditioning system, data room temperature adjustment system and temperature control method Download PDF

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Publication number
CN114877407B
CN114877407B CN202210466640.6A CN202210466640A CN114877407B CN 114877407 B CN114877407 B CN 114877407B CN 202210466640 A CN202210466640 A CN 202210466640A CN 114877407 B CN114877407 B CN 114877407B
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China
Prior art keywords
compressor
inlet
assembly
heat exchanger
outlet
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Application number
CN202210466640.6A
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Chinese (zh)
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CN114877407A (en
Inventor
李伟瀚
王雄飞
冯深燕
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Shenzhen Kstar Technology Co Ltd
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Shenzhen Kstar Technology Co Ltd
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Priority to CN202210466640.6A priority Critical patent/CN114877407B/en
Publication of CN114877407A publication Critical patent/CN114877407A/en
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Classifications

    • 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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/08—Compressors specially adapted for separate outdoor units
    • F24F1/10—Arrangement or mounting thereof
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • 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
    • 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
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
    • H05K7/20718—Forced ventilation of a gaseous coolant
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
    • H05K7/20836—Thermal management, e.g. server temperature control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

本申请涉及空调技术领域，本申请公开一种空调系统、数据机房温度调节系统及调温控制方法。其中空调系统，包括室外机组件，室外机组件包括压缩机组件、第一换热器组件、第二换热器组件及切换组件；压缩机组件包括第一压缩机及第二压缩机，第一压缩机的额定制冷量大于第二压缩机的额定制冷量；切换组件连接于第一压缩机与第二压缩机之间。通过压缩机组满足用户对于低负荷换热的需求，进而提高悬浮压缩机的寿命及调温系统的可靠性，并通过切换组件调整所述第一压缩机与所述第二压缩机的工作状态，灵活调整空调系统的换热状态。

The present application relates to the field of air conditioning technology, and discloses an air conditioning system, a data room temperature control system, and a temperature control method. The air conditioning system includes an outdoor unit assembly, and the outdoor unit assembly includes a compressor assembly, a first heat exchanger assembly, a second heat exchanger assembly, and a switching assembly; the compressor assembly includes a first compressor and a second compressor, and the rated cooling capacity of the first compressor is greater than the rated cooling capacity of the second compressor; the switching assembly is connected between the first compressor and the second compressor. The compressor unit can meet the user's demand for low-load heat exchange, thereby improving the life of the suspension compressor and the reliability of the temperature control system, and the working state of the first compressor and the second compressor can be adjusted by the switching assembly, so as to flexibly adjust the heat exchange state of the air conditioning system.

Description

Air conditioning system, data machine room temperature adjusting system and temperature adjusting control method
Technical Field
The application relates to the technical field of air conditioners, in particular to an air conditioning system, a data machine room temperature adjusting system and a temperature adjusting control method.
Background
The magnetic suspension or air suspension compressor has the advantages of large refrigerating capacity, high partial load energy efficiency, low noise, variable frequency regulation and the like, so that the refrigerating equipment has remarkable energy-saving effect and is gradually applied to medium and large data machine rooms. When the magnetic suspension or air suspension compressor runs under low load, the running efficiency is low, the flow of the refrigerant is insufficient, the surge phenomenon of the compressor exists, the service life of the suspension compressor and the reliability of a temperature regulating system are affected, and the temperature fluctuation in a data machine room is large.
Disclosure of Invention
The application aims to solve the technical problems of low operation efficiency and insufficient refrigerant flow when an air conditioning system adopting a compressor with large refrigerating capacity is operated under a low load, and mainly aims to provide an air conditioning system, a data machine room temperature regulating system and a temperature regulating control method which can realize both high load and low load switching.
In order to achieve the aim of the application, the application adopts the following technical scheme:
According to one aspect of the present application, there is provided an air conditioning system including an outdoor unit assembly including a compressor assembly, a first heat exchanger assembly, a second heat exchanger assembly, and a switching assembly;
The compressor assembly comprises a first compressor and a second compressor, wherein the rated refrigerating capacity of the first compressor is larger than that of the second compressor;
the outlet of the first compressor communicates with the first inlet of the first heat exchanger assembly,
The second compressor outlet is communicated with a second inlet of the first heat exchanger assembly, and an inlet of the second compressor is connected with the second heat exchanger assembly;
the outlet of the first heat exchanger component is connected with the inlet of the second heat exchanger component;
The switching assembly is connected between the first compressor and the second compressor.
According to an embodiment of the present application, the indoor unit further comprises an indoor unit assembly, wherein the inlet of the first compressor is connected with the outlet of the indoor unit assembly, and the outlet of the second heat exchanger assembly is connected with the inlet of the indoor unit assembly;
the first compressor is a suspension compressor, and the second compressor is a variable frequency compressor.
According to an embodiment of the application, the switching assembly comprises a reversing valve and a first one-way valve, wherein the reversing valve is arranged between the first compressor and the first heat exchanger assembly; and is also provided with
The reversing valve comprises a first connecting port, a second connecting port and a third connecting port, wherein:
the first connecting port is connected with an outlet of the first compressor;
the second connection port is connected with an inlet of the second heat exchanger assembly;
The third connection port is connected with the first inlet of the first heat exchanger assembly.
The first check valve is connected with the first compressor, an inlet of the first check valve is connected with an outlet of the indoor unit assembly, and an outlet of the first check valve is communicated with the first connecting port.
According to an embodiment of the application, the electronic expansion device comprises a first electronic expansion valve, one end of the first electronic expansion valve is connected with an outlet of the first heat exchanger assembly, and the other end of the first electronic expansion valve is connected with an inlet of the second heat exchanger assembly.
According to an embodiment of the application, the first heat exchanger component comprises a fan, a first condenser, a second condenser and a heat exchange air duct;
the fan is assembled at one end of the heat exchange air duct;
the first condenser and the second condenser are arranged in the heat exchange air duct;
the first condenser comprises a first inlet and a first outlet, the first inlet is connected with the outlet of the first compressor, and the first outlet is connected with the inlet of the second heat exchanger component;
the second condenser comprises a second inlet and a second outlet, the second inlet is connected with the second compressor outlet, and the second outlet is connected with the second heat exchanger assembly inlet.
According to an embodiment of the present application, a first branch is provided between the first outlet and the inlet of the second heat exchanger assembly, a second branch is provided between the second outlet and the inlet of the second heat exchanger assembly, and the first electronic expansion valve is disposed in the second branch.
According to an embodiment of the present application, the outdoor unit assembly further includes a liquid reservoir and a refrigerant pump, one port of the liquid reservoir is connected to the outlet of the second heat exchanger assembly, the other port of the liquid reservoir is connected to the liquid inlet of the refrigerant pump, and the liquid outlet of the refrigerant pump is connected to the liquid inlet of the indoor unit assembly.
According to one embodiment of the application, the indoor unit assembly comprises a plurality of groups of heat exchange assemblies, liquid inlets of adjacent heat exchange assemblies are communicated with each other, liquid outlets of adjacent heat exchange assemblies are communicated with each other, and a parallel heat exchange structure formed by the adjacent heat exchange assemblies is formed;
the heat exchange assembly comprises a heat exchanger and a plurality of inner fans, wherein a second electronic expansion valve is arranged between a liquid inlet of the heat exchanger and a liquid inlet of the indoor unit assembly, and the inner fans are arranged at intervals in the heat exchanger.
According to another aspect of the application, a temperature regulation system of a data room is provided, which comprises the air conditioning system.
According to another aspect of the present application, there is provided a temperature adjustment control method applied to the air conditioning system, wherein the temperature adjustment control method includes:
Acquiring a current outdoor temperature Tw, and if the current outdoor temperature Tw is lower than a first preset temperature Tw1, starting a first operation mode, wherein in the first operation mode, the compressor unit is closed and outdoor cold source refrigeration is started;
if the current outdoor temperature Tw is within the temperature range of the first preset temperature Tw1 and the second preset temperature Tw2, wherein Tw1 is less than Tw2, starting a mixed refrigeration mode, wherein in the mixed refrigeration mode, starting the first compressor and an outdoor cold source for refrigeration; or, in the mixed refrigeration mode, starting the second compressor and the outdoor cold source for refrigeration;
And if the current outdoor temperature Tw is greater than the second preset temperature Tw2, starting a compressor refrigeration mode, wherein in the compressor refrigeration mode, the first compressor is started and/or the second compressor is started.
According to the technical scheme, the air conditioning system, the data machine room temperature adjusting system and the temperature adjusting control method have the advantages that:
through set up first compressor at the off-premises station subassembly, make the import of first compressor with the exit linkage of indoor set subassembly, and then the accessible the suspension compressor satisfies the demand of user to high load heat transfer, on this basis, still include the second compressor on the off-premises station subassembly, through the second compressor satisfies the demand of user to low load heat transfer, and then improves the life-span of suspension compressor and temperature regulating system's reliability, and through switching over the subassembly adjustment first compressor with the heat transfer state of second compressor is adjusted in a flexible way.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a pipe connection principle of an air conditioning system according to an embodiment of the present application;
fig. 2 is a schematic diagram of another pipe connection principle of an air conditioning system according to an embodiment of the present application;
Fig. 3 is a schematic view of a refrigerant circulation flow direction structure of an air conditioning system in a first mode according to an embodiment of the present application;
Fig. 4 is a schematic view of a refrigerant circulation flow direction structure of an air conditioning system in a second mode according to an embodiment of the present application;
fig. 5 is a schematic view of a refrigerant circulation flow direction structure of an air conditioning system in a third mode according to an embodiment of the present application;
Fig. 6 is a schematic view of a refrigerant circulation flow direction structure of an air conditioning system in a fourth mode according to an embodiment of the present application;
fig. 7 is a schematic view of a refrigerant circulation flow direction structure of an air conditioning system in a fifth mode according to an embodiment of the present application;
fig. 8 is a schematic view of a refrigerant circulation flow direction structure of an air conditioning system in a sixth mode according to an embodiment of the present application;
fig. 9 is a schematic flow chart of a temperature adjustment control method according to an embodiment of the present application.
Wherein:
100. an outdoor unit assembly;
11. a first compressor; 12. a second compressor;
120. A first heat exchanger assembly;
23. An external fan; 24. a first condenser; 241. a first inlet; 242. a first outlet; 25. a second condenser; 251. a second inlet; 252. a second outlet; 26. a heat exchange air duct; 27. a first branch; 28. a second branch;
130. a second heat exchanger assembly;
140. A switching assembly;
41. A reversing valve; 411. a first connection port; 412. a second connection port; 413. a third connection port;
42. A first one-way valve; 43. a first electronic expansion valve;
150. A reservoir;
160. A refrigerant pump;
200. An indoor unit assembly;
210. a heat exchange assembly; 201. a heat exchanger; 202. an inner fan; 203. and a second electronic expansion valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The magnetic suspension or air suspension compressor has the advantages of large refrigerating capacity, high partial load energy efficiency, low noise, variable frequency regulation and the like, and can operate in a mixed mode (namely, a mode that the compressor mechanically refrigerates and the fluorine pump circularly provide natural refrigeration together) or a pure fluorine pump mode under the condition of low outdoor temperature by being matched with the refrigerant pump 160, so that the energy-saving effect of the refrigerating equipment is remarkable, and the magnetic suspension or air suspension compressor is gradually applied to a medium-large data center.
When the magnetic suspension or air suspension compressor runs under low load, the running efficiency is lower than that of the traditional compressor; under low load, the refrigerant flow is insufficient, so that the surging phenomenon of the suspension compressor exists, and the service life of the suspension compressor and the reliability of the system are affected; the minimum output refrigerating capacity of the suspension compressor is 10% of the rated refrigerating capacity, and when the load of a newly built machine room or the machine room is very low (lower than 10%), and when a small part of mechanical refrigeration needs to be supplemented by the suspension compressor system in a mixed mode, the suspension compressor is frequently started and stopped, and the temperature fluctuation of the machine room is large, so that the normal operation of IT equipment is influenced.
According to an aspect of the present application, there is provided an air conditioning system including an outdoor unit assembly 100, the outdoor unit assembly 100 including a compressor assembly, a first heat exchanger assembly 120, a second heat exchanger assembly 130, and a switching assembly 140;
the compressor assembly comprises a first compressor 11 and a second compressor 12, wherein the rated refrigerating capacity of the first compressor 11 is larger than that of the second compressor 12;
the outlet of the first compressor 11 communicates with the first inlet 241 of the first heat exchanger assembly 120,
The outlet of the second compressor 12 is communicated with the second inlet 251 of the first heat exchanger assembly 120, and the inlet of the second compressor 12 is connected with the second heat exchanger assembly 130;
The outlet of the first heat exchanger assembly 120 is connected to the inlet of the second heat exchanger assembly 130;
The switching assembly 140 is connected between the first compressor 11 and the second compressor 12.
Referring to fig. 1 and 2, the outdoor unit assembly 100 is provided with the first compressor 11, so that an inlet of the first compressor 11 is connected with an outlet of the indoor unit assembly 200, and further the suspension compressor can meet the requirement of a user on high-load heat exchange, and on this basis, the outdoor unit assembly 100 further comprises the second compressor 12, and the second compressor 12 meets the requirement of the user on low-load heat exchange, so that the service life of the suspension compressor and the reliability of the temperature regulation system are improved, and the working states of the first compressor 11 and the second compressor 12 are regulated through the switching assembly 140, so that the heat exchange state of the air conditioning system is flexibly regulated.
As an example, the rated refrigerating capacity of the second compressor 12 is smaller than that of the first compressor 11, when the pipeline connection types of the second compressor 12 and the conventional compressor are adopted alone, a plurality of compressors need to be connected in parallel to achieve a larger refrigerating capacity output, the pipeline system and the control are complex, and the pipeline connection length of the system is limited and the application range is limited because the normal oil return of the compressor lubricating oil is ensured. According to the technical scheme, the defects of the existing pure suspension compressor system or the independent adoption of the conventional compressor system can be overcome, the output of refrigerating capacity as low as 1% can be realized in a mechanical refrigerating mode, the problems of difficult oil return and limited connecting pipe length of the conventional compressor system are avoided, and the air conditioning system can utilize an outdoor natural cold source to the greatest extent according to the outdoor temperature change and the indoor load in real time, so that the system always operates at the highest energy efficiency point.
According to an embodiment of the present application, the indoor unit assembly 200 further comprises an inlet of the first compressor 11 connected to an outlet of the indoor unit assembly 200, and an outlet of the second heat exchanger assembly 130 connected to an inlet of the indoor unit assembly 200;
the first compressor 11 is a suspension compressor, and the second compressor 12 is a variable frequency compressor.
As an example, the first compressor 11 is a magnetic suspension compressor, a set of conventional compressor refrigeration cycle is added on the outdoor unit assembly 100 side based on the existing magnetic suspension machine room air conditioner, that is, the refrigeration cycle of the second compressor 12 is added, and the outdoor unit includes two independent condensers inside, one for cooling a magnetic suspension/air suspension compressor (hereinafter collectively referred to as a suspension compressor) system and one for cooling a common compressor system; the refrigerating capacity of the conventional compressor system is transmitted to the indoor side through the intermediate evaporation condenser; in the mechanical refrigeration mode, when the indoor heat load is less than 10% of the rated refrigeration capacity of the air conditioning system, the conventional compressor system is adopted for refrigeration, and the suspension compressor cannot be started, so that the defect of the suspension compressor system is overcome, and the energy efficiency, the service life and the control precision of the air conditioning system are improved.
According to an embodiment of the present application, the switching assembly 140 includes a reversing valve 41 and a first check valve 42, wherein the reversing valve 41 is disposed between the first compressor 11 and the first heat exchanger assembly 120; and is also provided with
The reversing valve 41 includes a first connection port 411, a second connection port 412, and a third connection port 413, wherein:
The first connection port 411 is connected to an outlet of the first compressor 11;
the second connection port 412 is connected to an inlet of the second heat exchanger assembly 130;
the third connection port 413 is connected to the first inlet 241 of the first heat exchanger assembly 120;
The first check valve 42 is connected to the first compressor 11, and the inlet of the first check valve 42 is connected to the outlet of the indoor unit assembly 200, and the outlet of the first check valve 42 is connected to the first connection port 411.
As an example, the reversing valve 41 is a three-way reversing valve 41, so that the first one-way valve 42 is connected in parallel with the first compressor 11, and when the refrigerant pump 16011 is turned on, the refrigerant partially or completely passes through the first one-way valve 42 according to different modes, and a natural cold source is utilized to reduce the work done by the refrigerant passing through the first compressor 11, that is, the suspension compressor, so as to reduce the energy consumption.
According to an embodiment of the present application, a first electronic expansion valve 43 is included, one end of the first electronic expansion valve 43 is connected to the outlet of the first heat exchanger assembly 120, and the other end of the first electronic expansion valve 43 is connected to the inlet of the second heat exchanger assembly 130. The heat exchange efficiency between the outlet of the first heat exchanger assembly 120 and the second heat exchanger assembly 130 may be controlled by the first electronic expansion valve 43.
As an example, according to an embodiment of the present application, the first branch 27 is located between the first outlet 242 and the inlet of the second heat exchanger assembly 130, the second branch 28 is located between the second outlet 252 and the inlet of the second heat exchanger assembly 130, and the first electronic expansion valve 43 is disposed in the second branch 28.
Furthermore, the second compressor 12, the second condenser 25, the first electronic expansion valve 43 and the second heat exchanger assembly 130 may form a refrigeration cycle, so that a user may adjust the refrigeration efficiency of the refrigeration cycle according to the actual use situation, thereby improving the flexibility and convenience of use.
According to an embodiment of the present application, the first heat exchanger assembly 120 includes a fan, a first condenser 24, a second condenser 25, and a heat exchanging air duct 26;
the fan is assembled at one end of the heat exchange air duct 26;
the heat exchange air duct 26 is internally provided with the first condenser 24 and the second condenser 25;
The first condenser 24 comprises a first inlet 241 and a first outlet 242, the first inlet 241 is connected with the outlet of the first compressor 11, and the first outlet 242 is connected with the inlet of the second heat exchanger assembly 130;
The second condenser 25 includes a second inlet 251 and a second outlet 252, the second inlet 251 is connected to the outlet of the second compressor 12, and the second outlet is connected to the inlet of the second heat exchanger assembly 130.
The first condenser 24 and the second condenser 25 may be disposed in the same heat exchange air duct 26 so as to share the outer fan 23, and the first condenser 24 and the second condenser 25 may be subjected to heat exchange by the outer fan 23, further, the second condenser 25 may be disposed facing the outer fan 23, so that the second condenser 25 is disposed between the outer fan 23 and the first condenser 24, the first compressor 11 performs heat exchange with the first condenser 24 mainly, the second compressor 12 performs heat exchange with the second condenser 25 mainly, and meanwhile, the second condenser 25 and the outer fan 23 may also provide part of heat for the operation of the first condenser 24, so as to reduce the problem of frosting of the first condenser 24 in the operation process, and improve the utilization rate of waste heat.
According to an embodiment of the present application, the first branch 27 is disposed between the first outlet 242 and the inlet of the second heat exchanger assembly 130, the second branch 28 is disposed between the second outlet 252 and the inlet of the second heat exchanger assembly 130, and the first electronic expansion valve 43 is disposed in the second branch 28.
As an example, the first condenser 24 and the second condenser 25 may be disposed in the same heat exchanging air duct 26 so as to share the external fan 23, and the first condenser 24 and the second condenser 25 may be heat-exchanged by the external fan 23, further, the second condenser 25 may be disposed facing the external fan 23, such that the second condenser 25 is disposed between the external fan 23 and the first condenser 24, the first compressor 11 is connected to the second heat exchanger assembly 130 through the first branch 27 and is heat-exchanged mainly through the first condenser 24, the second compressor 12 is connected to the second heat exchanger assembly 130 through the second branch 28, and at the same time, the second condenser 25 and the external fan 23 may also provide part of heat for the operation of the first condenser 24, so as to reduce the problem of increased heat utilization of the first condenser 24 during operation.
According to an embodiment of the present application, the outdoor unit assembly 100 further includes a liquid reservoir 150 and a refrigerant pump 160, one port of the liquid reservoir 150 is connected to the outlet of the second heat exchanger assembly 130, the other port of the liquid reservoir 150 is connected to the inlet of the refrigerant pump 160, and the liquid outlet of the refrigerant pump 160 is connected to the liquid inlet of the indoor unit assembly 200.
By way of example, the accumulator 150 provides sufficient liquid refrigerant to the refrigerant pump 160 to avoid shut-off of operation of the refrigerant pump 160, and the heat exchange medium in the piping is directed into the indoor unit assembly 200 by the refrigerant pump 160 to participate in the indoor heat exchange cycle.
According to an embodiment of the present application, the indoor unit assembly 200 includes a plurality of groups of heat exchange assemblies 210, the liquid inlets of adjacent heat exchange assemblies 210 are mutually communicated, and the outlets of adjacent heat exchange assemblies 210 are mutually communicated to form a parallel heat exchange structure formed by adjacent heat exchange assemblies 210;
one heat exchange assembly 210 includes the heat exchanger 201 and a plurality of internal fans 202, the second electronic expansion valve 203 is disposed between the inlet of the heat exchanger 201 and the inlet of the indoor unit assembly 200, and the plurality of internal fans 202 are disposed in the heat exchanger 201 at intervals.
As an example, the heat exchanger 201 includes an internal machine evaporator, where the outlets of the first heat exchange assemblies 210 are connected, and the inlets of the first heat exchange assemblies 210 are connected, so that the heat exchange assemblies 210 form a parallel heat exchange structure, so as to facilitate adjustment of the heat exchange state of each heat exchange assembly 210.
Further, since each heat exchange assembly 210 includes the second electronic expansion valve 203, the flexibility of the user in the use process is further improved by adjusting the heat exchange efficiency of the second electronic expansion valve 203 in the corresponding heat exchange assembly 210.
As an example, the heat exchangers 201 at different positions are heat-exchanged by a plurality of the fans, and participate in indoor heat exchange.
Overall, reference is made to fig. 3-8, which show:
(1) An air conditioner of multi-connected energy-saving machine room and a control method thereof.A fan 23, a first condenser 24 and a second condenser 25 jointly form an air-cooled outdoor unit, namely a first heat exchanger component 120; the first condenser 24 is connected with the second compressor 12 (a conventional compressor), the first electronic expansion valve 43 and the second heat exchanger assembly 130 through pipelines, and together form a conventional compressor refrigeration system;
(2) The indoor unit assembly 200 comprises a plurality of heat exchange assemblies 210, and the second electronic expansion valve 203, the inner fan 202 and the heat exchanger 201 together form the heat exchange assemblies 210; the inlets and outlets of the one or more heat exchange assemblies 210 are connected in parallel with the main pipeline and are connected in series with the first compressor 11, the reversing valve 41, the first condenser 24, the second heat exchanger assembly 130, the liquid reservoir 150, the indoor unit assembly 200 and the refrigerant pump 160 to form a main refrigeration cycle; wherein the first check valve 42 is connected in parallel with the first compressor 11; the inlet, i.e., the first connection port 411, of the three-way valve switching valve 41 may communicate with the outlet second connection port 412 or the third connection port 413, respectively;
(3) If the rated refrigerating capacity of the air conditioning system is Q, the mechanical refrigerating capacity of the suspension compressor is Q1, and the mechanical refrigerating capacity of the conventional compressor is Q2, then Q=Q1+Q2, and Q2=Q×10%; the refrigerating capacity in the energy-saving refrigerating mode of the fluorine pump is Q3, and the Q3 changes along with the change of the outdoor temperature.
The control method comprises the following steps:
(1) By defining the outdoor temperatures Tw1 and Tw2 and the outdoor temperature detection values Tw, tw1 < Tw2, the air conditioning system cooling mode is divided into 6 sub-modes according to Tw, and the refrigerant circulation flows are shown in fig. 3, 4, 5, 6, 7, and 8.
As an example, the following scenario may exist:
(2) When the outdoor temperature detection value Tw is less than or equal to Tw1, the first mode, namely the fluorine pump energy-saving refrigeration mode, is operated, the refrigerant pump 160 is started, the second compressor 12 is closed, the first electronic expansion valve 43 is closed, the first compressor 11 is closed, the first connection port 411 and the third connection port 413 of the reversing valve 41 are communicated, the outlet of the second connection port 412 is closed, the second heat exchanger assembly 130 does not participate in heat exchange, the outer fan 23 and the tail end indoor unit assembly 200 are started, the outdoor natural cold source is fully utilized, and the refrigeration cycle is shown in fig. 3;
(3) When the external temperature detection value meets Tw1 < Tw.ltoreq.Tw 2, the indoor load calculated by the system is P1, the corresponding energy-saving refrigerating capacity Q3 < P1 < (Q3 + Q2) of the fluorine pump at the current outdoor temperature enters a second mode, the refrigerant pump 160 is started, the first compressor 11 is kept closed, the second compressor 12 is started, the first electronic expansion valve 43 is started and controlled according to the suction superheat degree, the first connecting port 411 and the third connecting port 413 of the reversing valve 41 are communicated, the outlet of the second connecting port 412 is closed, the second heat exchanger component 130 is involved in heat exchange, the external fan 23 and the tail end indoor unit component 200 are started, the refrigerating capacity is jointly output by utilizing the natural cold source and the mechanical refrigeration of the conventional compressor, and the refrigerating cycle is shown in fig. 4;
(4) When the external temperature detection value meets Tw1 < Tw.ltoreq.Tw 2, the indoor load calculated by the system is P1, the corresponding energy-saving refrigerating capacity (Q3+Q2) of the fluorine pump at the current outdoor temperature is less than P1 < (Q3+Q1), the fluorine pump enters a third mode, the refrigerant pump 160 is started, the first compressor 11 is started, the second compressor 12 is closed, the first electronic expansion valve 43 is closed, the first connecting port 411 and the third connecting port 413 of the reversing valve 41 are communicated, the outlet of the second connecting port 412 is closed, the second heat exchanger component 130 does not participate in heat exchange, the external fan 23 and the indoor unit component 200 are started, the refrigerating capacity is jointly output by utilizing the mechanical refrigeration of a natural cold source and the suspension compressor, and the refrigerating cycle is shown in FIG. 5;
(5) When the external temperature detection value meets Tw > Tw2, the outdoor cold source cannot be utilized, the indoor load calculated by the system is P1, and P1 is less than Q2, the system enters the fourth mode, the refrigerant pump 160 is turned on, the first compressor 11 is turned off, the second compressor 12 is turned on, the first electronic expansion valve 43 is turned on and controlled according to the superheat degree of the suction gas, the first connection port 411 and the second connection port 412 of the reversing valve 41 are communicated, the outlet of the third connection port 413 is closed, the second heat exchanger assembly 130 participates in heat exchange, the external fan 23 and the tail end indoor unit assembly 200 are turned on, the refrigeration capacity is mechanically cooled by the conventional compressor, and the refrigeration cycle is as shown in fig. 6;
(6) When the external temperature detection value meets Tw > Tw2, an outdoor cold source cannot be utilized at this time, the indoor load calculated by the system is P1, Q2 is less than P1 and less than or equal to Q1, the refrigerant pump 160 is turned off, the first compressor 11 is turned on, the second compressor 12 is turned off, the first electronic expansion valve 43 is turned off, the first connection port 411 and the third connection port 413 of the reversing valve 41 are communicated, the outlet of the second connection port 412 is turned off, the second heat exchanger component 130 does not participate in heat exchange, the external fan 23 and the tail end indoor unit component 200 are turned on, the mechanical refrigeration output refrigeration capacity of the suspension compressor is realized, and the refrigeration cycle is shown in fig. 7;
(7) When the detected value of the external temperature satisfies Tw > Tw2, the outdoor cold source cannot be utilized, the indoor load calculated by the system is P1, and P1 > Q1, and the system enters the sixth mode, the refrigerant pump 160 is turned off, the first compressor 11 is turned on, the second compressor 12 is turned on, the first electronic expansion valve 43 is turned on and controlled according to the superheat degree of the suction air, the first connection port 411 and the third connection port 413 of the reversing valve 41 are in channel communication, the second connection port 412 is turned off, the second heat exchanger assembly 130 participates in heat exchange, the external fan 23 and the terminal indoor unit assembly 200 are turned on, the mechanical refrigeration of the suspension compressor and the conventional compressor jointly output the refrigeration capacity, and the refrigeration cycle is as shown in fig. 8.
By the aid of the scheme, the defects of an existing pure magnetic suspension/air suspension compressor system and a conventional compressor system are overcome, refrigerating output as low as 1% can be achieved in a mechanical refrigerating mode, surge faults of the suspension compressor under low load are avoided, the problems that the conventional compressor system is difficult in oil return and limited in connecting pipe length are avoided, an air conditioning system can utilize outdoor natural cold sources to the greatest extent in real time according to outdoor temperature change and indoor load, and the system is enabled to always operate at the highest energy efficiency point.
Examples: the design refrigerating capacity q=500 kw of the air conditioning system, wherein the design refrigerating capacity q1=450 kw of the suspension compressor, the design refrigerating capacity q2=50 kw of the conventional compressor, and the minimum refrigerating capacity output of the suspension compressor and the conventional compressor is 10% of the design refrigerating capacity of the suspension compressor and the conventional compressor, the minimum refrigerating capacity output of the air conditioning system in the mechanical refrigerating mode is qmin=10%. Q2/q=1%.
According to another aspect of the application, a temperature regulation system of a data room is provided, which comprises the air conditioning system.
According to another aspect of the present application, there is provided a temperature adjustment control method applied to the air conditioning system, wherein the temperature adjustment control method includes:
Acquiring a current outdoor temperature Tw, and if the current outdoor temperature Tw is lower than a first preset temperature Tw1, starting a first operation mode, wherein in the first operation mode, the compressor unit is closed and outdoor cold source refrigeration is started;
if the current outdoor temperature Tw is within the temperature ranges of the first preset temperature Tw1 and the second preset temperature Tw2, wherein Tw1 is less than Tw2, starting a hybrid cooling mode, wherein in the hybrid cooling mode, the first compressor 11 and the outdoor cold source are started for cooling; or, in the mixed cooling mode, starting the second compressor 12 and the outdoor cold source for cooling;
and if the current outdoor temperature Tw is greater than the second preset temperature Tw2, starting a compressor refrigeration mode, wherein the first compressor 11 and/or the second compressor 12 are/is started in the compressor refrigeration mode.
As shown with reference to fig. 9, by way of example:
Acquiring the current outdoor temperature Tw, if the current outdoor temperature Tw is lower than the first preset temperature Tw1, starting a first operation mode, where the compressor unit is turned off and outdoor cold source cooling is started in the first operation mode, as shown in fig. 3, that is, when the outdoor temperature detected value Tw is less than or equal to Tw1, the first mode, that is, the fluorine pump energy-saving cooling mode, is operated, where the refrigerant pump 160 is turned on, the second compressor 12 is turned off, the first electronic expansion valve 43 is turned off, the first compressor 11 is turned off, the first connection port 411 and the third connection port 413 of the reversing valve 41 are communicated, the second connection port 412 is turned off, the second heat exchanger assembly 130 does not participate in heat exchange, the outer blower 23 and the terminal indoor unit assembly 200 are turned on, the outdoor natural cold source is fully utilized, and the cooling cycle is as shown in fig. 3.
If the current outdoor temperature Tw is within the temperature ranges of the first preset temperature Tw1 and the second preset temperature Tw2, wherein Tw1 is less than Tw2, starting a hybrid cooling mode, wherein in the hybrid cooling mode, the first compressor 11 and the outdoor cold source are started for cooling; or, in the mixed cooling mode, starting the second compressor 12 and the outdoor cold source for cooling;
As an example, (3) when the detected value of the external temperature satisfies Tw1 < Tw2, the indoor load calculated by the system is P1, the corresponding energy-saving refrigeration capacity Q3 < P1 < (q3+q2) of the fluorine pump at the current outdoor temperature enters the second mode, the refrigerant pump 160 is turned on, the first compressor 11 is kept off, the second compressor 12 is turned on, the first electronic expansion valve 43 is turned on and controlled according to the suction superheat degree, the first connection port 411 and the third connection port 413 of the reversing valve 41 are communicated, the outlet of the second connection port 412 is turned off, the second heat exchanger assembly 130 participates in heat exchange, the external fan 23 and the terminal indoor unit assembly 200 are turned on, the refrigeration capacity is jointly outputted by using the natural cooling source and the mechanical refrigeration of the conventional compressor, and the refrigeration cycle is shown in fig. 4;
(4) When the detected value of the external temperature satisfies Tw1 < Tw.ltoreq.Tw 2, the indoor load calculated by the system is P1, the corresponding energy-saving refrigerating capacity (Q3+Q2) of the fluorine pump is less than P1 < (Q3+Q1) at the current outdoor temperature, the refrigerant pump 160 is started, the first compressor 11 is started, the second compressor 12 is closed, the first electronic expansion valve 43 is closed, the first connecting port 411 and the third connecting port 413 of the reversing valve 41 are communicated, the outlet of the second connecting port 412 is closed, the second heat exchanger assembly 130 does not participate in heat exchange, the external fan 23 and the indoor unit assembly 200 are started, the refrigerating capacity is jointly output by utilizing the mechanical refrigeration of the natural cold source and the suspension compressor, and the refrigerating cycle is shown in FIG. 5.
In another embodiment, if the current outdoor temperature Tw is greater than the second preset temperature Tw2, a compressor cooling mode is started, where the first compressor 11 and/or the second compressor 12 is started in the compressor cooling mode.
As an example, (5) when the detected value of the external temperature satisfies Tw > Tw2, and at this time, the outdoor cold source cannot be utilized, the indoor load calculated by the system is P1, and P1 < Q2, and the system enters the fourth mode, the refrigerant pump 160 is turned on, the first compressor 11 is turned off, the second compressor 12 is turned on, the first electronic expansion valve 43 is turned on and controlled according to the superheat degree of the suction gas, the first connection port 411 and the second connection port 412 of the reversing valve 41 are communicated, the outlet of the third connection port 413 is turned off, the second heat exchanger assembly 130 participates in heat exchange, the external fan 23 and the terminal indoor unit assembly 200 are turned on, the mechanical refrigeration output refrigeration capacity is obtained by the conventional compressor, and the refrigeration cycle is as shown in fig. 6;
(6) When the external temperature detection value meets Tw > Tw2, an outdoor cold source cannot be utilized at this time, the indoor load calculated by the system is P1, Q2 is less than P1 and less than or equal to Q1, the refrigerant pump 160 is turned off, the first compressor 11 is turned on, the second compressor 12 is turned off, the first electronic expansion valve 43 is turned off, the first connection port 411 and the third connection port 413 of the reversing valve 41 are communicated, the outlet of the second connection port 412 is turned off, the second heat exchanger component 130 does not participate in heat exchange, the external fan 23 and the tail end indoor unit component 200 are turned on, the mechanical refrigeration output refrigeration capacity of the suspension compressor is realized, and the refrigeration cycle is shown in fig. 7;
(7) When the detected value of the external temperature satisfies Tw > Tw2, the outdoor cold source cannot be utilized, the indoor load calculated by the system is P1, and P1 > Q1, and the system enters the sixth mode, the refrigerant pump 160 is turned off, the first compressor 11 is turned on, the second compressor 12 is turned on, the first electronic expansion valve 43 is turned on and controlled according to the superheat degree of the suction air, the first connection port 411 and the third connection port 413 of the reversing valve 41 are in channel communication, the second connection port 412 is turned off, the second heat exchanger assembly 130 participates in heat exchange, the external fan 23 and the terminal indoor unit assembly 200 are turned on, the mechanical refrigeration of the suspension compressor and the conventional compressor jointly output the refrigeration capacity, and the refrigeration cycle is as shown in fig. 8.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An air conditioning system, comprising an outdoor unit assembly (100) and an indoor unit assembly (200), wherein the outdoor unit assembly (100) comprises a compressor assembly, a first heat exchanger assembly (120), a second heat exchanger assembly (130), a refrigerant pump (160) and a switching assembly (140);
the compressor assembly comprises a first compressor (11) and a second compressor (12), wherein the rated refrigerating capacity of the first compressor (11) is larger than that of the second compressor (12);
The first heat exchanger assembly (120) comprises an external fan (23), a first condenser (24), a second condenser (25) and a heat exchange air duct (26); the inlet of the second heat exchanger assembly (130) comprises a first inlet and a second inlet, the outlet of the second heat exchanger assembly (130) comprises a first outlet and a second outlet, the first inlet is communicated with the first outlet, and the second inlet is communicated with the second outlet;
The outer fan (23) is assembled at one end of the heat exchange air duct (26);
The heat exchange air duct (26) is internally provided with the first condenser (24) and the second condenser (25);
the first condenser (24) comprises a first inlet (241) and a first outlet (242), the first inlet (241) is connected with the outlet of the first compressor (11), and the first outlet (242) is connected with the inlet I of the second heat exchanger assembly (130);
The second condenser (25) comprises a second inlet (251) and a second outlet (252), the second inlet (251) is connected with the outlet of the second compressor (12), and the second outlet (252) is connected with the second inlet of the second heat exchanger assembly (130); the inlet of the second compressor (12) is connected with the second outlet of the second heat exchanger assembly (130); an outlet of the second heat exchanger assembly (130) is connected with an inlet of the refrigerant pump (160), and an outlet of the refrigerant pump (160) is connected with an inlet of the indoor unit assembly (200);
The switching assembly (140) comprises a reversing valve (41) and a first one-way valve (42), the first one-way valve (42) is connected with the first compressor (11) in parallel, and an inlet of the first compressor (11) and an inlet of the first one-way valve (42) are connected with an outlet of the indoor unit assembly (200);
the reversing valve (41) is arranged between the first compressor (11) and the first heat exchanger assembly (120); and is also provided with
The reversing valve (41) comprises a first connecting port (411), a second connecting port (412) and a third connecting port (413), wherein:
The first connection port (411) is connected with an outlet of the first compressor (11);
the second connection port (412) is connected with an inlet I of the second heat exchanger assembly (130);
The third connection port (413) is connected with a first inlet (241) of the first heat exchanger assembly (120);
the outlet of the first one-way valve (42) is communicated with the first connecting port (411).
2. An air conditioning system according to claim 1, characterized in that the first compressor (11) is a suspension compressor and the second compressor (12) is a variable frequency compressor.
3. The air conditioning system according to claim 1, wherein the switching assembly (140) comprises a first electronic expansion valve (43), one end of the first electronic expansion valve (43) being connected to the second outlet (252) of the first heat exchanger assembly (120), the other end of the first electronic expansion valve (43) being connected to the second inlet of the second heat exchanger assembly (130).
4. An air conditioning system according to claim 3, characterized in that a first branch (27) is provided between the first outlet (242) and the first inlet of the second heat exchanger assembly (130), a second branch (28) is provided between the second outlet (252) and the second inlet of the second heat exchanger assembly (130), and the first electronic expansion valve (43) is arranged in the second branch (28).
5. The air conditioning system according to claim 1, wherein the outdoor unit assembly (100) further comprises a liquid reservoir (150), one port of the liquid reservoir (150) is connected to the outlet port of the second heat exchanger assembly (130), the other port of the liquid reservoir (150) is connected to the liquid inlet port of the refrigerant pump (160), and the liquid outlet port of the refrigerant pump (160) is connected to the liquid inlet port of the indoor unit assembly (200).
6. The air conditioning system according to claim 1, wherein the indoor unit assembly (200) includes a plurality of groups of heat exchange assemblies (210), liquid inlets of adjacent heat exchange assemblies (210) are communicated with each other, and liquid outlets of adjacent heat exchange assemblies (210) are communicated with each other to form a parallel heat exchange structure formed by adjacent heat exchange assemblies (210);
One heat exchange assembly (210) comprises a heat exchanger (201) and a plurality of internal fans (202), a second electronic expansion valve (203) is arranged between a liquid inlet of the heat exchanger (201) and a liquid inlet of the indoor unit assembly (200), and the internal fans (202) are arranged at intervals in the heat exchanger (201).
7. A data room temperature conditioning system comprising the air conditioning system of any of claims 1-6.
8. A temperature control method, applied to the air conditioning system according to any one of claims 1 to 6, wherein the temperature control method comprises:
Acquiring a current outdoor temperature Tw, and if the current outdoor temperature Tw is lower than a first preset temperature Tw1, starting a first operation mode, wherein in the first operation mode, the compressor unit is closed and outdoor cold source refrigeration is started;
If the current outdoor temperature Tw is within the temperature range of the first preset temperature Tw1 and the second preset temperature Tw2, wherein Tw1 is less than Tw2, starting a mixed refrigeration mode, wherein in the mixed refrigeration mode, the first compressor (11) and an outdoor cold source are started for refrigeration; or, in the mixed refrigeration mode, starting the second compressor (12) and an outdoor cold source for refrigeration;
And if the current outdoor temperature Tw is greater than the second preset temperature Tw2, starting a compressor refrigeration mode, wherein the first compressor (11) and/or the second compressor (12) are/is started in the compressor refrigeration mode.
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CN111735224A (en) * 2020-01-21 2020-10-02 天津冷源工程设计院 Refrigerating system suitable for multiple load working condition
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