CN112197372A - Multi-connected refrigeration system and control method thereof - Google Patents

Multi-connected refrigeration system and control method thereof Download PDF

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Publication number
CN112197372A
CN112197372A CN201910611525.1A CN201910611525A CN112197372A CN 112197372 A CN112197372 A CN 112197372A CN 201910611525 A CN201910611525 A CN 201910611525A CN 112197372 A CN112197372 A CN 112197372A
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China
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refrigeration
heat pipe
indoor
compression
unit
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CN201910611525.1A
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Chinese (zh)
Inventor
王祎
史俊茹
钟建法
张萌
秦雨峰
周晓晓
秦艳
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Dunan Environment Technology Co Ltd
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Dunan Environment Technology Co Ltd
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Priority to CN201910611525.1A priority Critical patent/CN112197372A/en
Publication of CN112197372A publication Critical patent/CN112197372A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • 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
    • 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
    • F24F11/871—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 by controlling outdoor fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to a multi-connected refrigeration system and a control method thereof, wherein the multi-connected refrigeration system comprises an indoor unit; the heat pipe refrigeration outdoor unit comprises a plurality of heat pipe refrigeration modules, and the plurality of heat pipe refrigeration modules are arranged in parallel and are respectively connected with the indoor unit through a first circulating pipeline; the compression refrigeration outdoor unit comprises a plurality of compression refrigeration modules, and the compression refrigeration modules are arranged in parallel and are respectively connected with the indoor unit through second circulating pipelines; and the control device can respectively control the opening and closing of each heat pipe refrigeration module on the heat pipe refrigeration external machine and each compression refrigeration module on the compression refrigeration external machine. The invention can fully utilize the advantage of low energy consumption of the heat pipe refrigeration external machine; and meanwhile, the refrigeration efficiency of the multi-connection refrigeration system plays a role.

Description

Multi-connected refrigeration system and control method thereof
Technical Field
The invention belongs to the technical field related to refrigeration technology, and particularly relates to a multi-connected refrigeration system and a control method thereof.
Background
With the rapid development of the communication industry, the demand of newly building or modifying a data center on a heat dissipation air conditioner is greatly increased, and higher requirements on the performance and the energy conservation of the air conditioner are also provided. The separated heat pipe refrigeration technology is a novel refrigeration technology capable of effectively utilizing an outdoor natural cold source, and the heat pipe refrigeration system does not need to consume energy in working, so that the heat pipe refrigeration system is increasingly applied to heat dissipation of a data center.
It can be understood that the operation of the heat pipe refrigeration system requires that the outdoor temperature be lower than the indoor temperature, which still has application limitation for the data center which is operated uninterruptedly, especially losing its function in the season of high air temperature. Therefore, people combine compression refrigeration with heat pipe refrigeration, and the reliability of compression refrigeration and the energy conservation of heat pipe refrigeration are fully utilized to meet the requirement of uninterrupted refrigeration of a data center.
However, in the existing refrigeration system for data center heat dissipation, the heat pipe refrigeration system and the compression refrigeration system share a pipeline and a heat exchanger, so that the heat pipe refrigeration system and the compression refrigeration system on the existing refrigeration system can only operate independently, and the advantage of low energy consumption of heat pipe refrigeration cannot be fully exerted; in addition, the existing refrigeration system consisting of a heat pipe refrigeration system and a compression refrigeration system transfers heat in a mode of an intermediate heat exchanger, so that intermediate heat exchange loss is caused, and the overall refrigeration efficiency of the refrigeration system is reduced.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a multi-split refrigeration system and a control method thereof.
Concretely, the multi-connected refrigeration system comprises
An indoor unit;
the heat pipe refrigeration outdoor unit comprises a plurality of heat pipe refrigeration modules, and the plurality of heat pipe refrigeration modules are arranged in parallel and are respectively connected with the indoor unit through a first circulating pipeline;
the compression refrigeration outdoor unit comprises a plurality of compression refrigeration modules, and the compression refrigeration modules are arranged in parallel and are respectively connected with the indoor unit through second circulating pipelines;
and the control device can respectively control the opening and closing of each heat pipe refrigeration module on the heat pipe refrigeration external machine and each compression refrigeration module on the compression refrigeration external machine.
As a preferable scheme of the present invention, the indoor unit includes a plurality of indoor unit modules, and the plurality of indoor unit modules are arranged in parallel, wherein each of the indoor unit modules is connected and communicated with the first circulation pipeline and the second circulation pipeline, respectively.
As a preferred scheme of the present invention, each of the indoor unit modules is provided with a control element, and the control element can control the on/off of the corresponding indoor unit module.
In a preferred embodiment of the present invention, each of the plurality of compression refrigeration modules is connected to and communicated with the second circulation line through a branch line, and each of the branch lines is provided with a blocking member for controlling on/off of the branch line.
In a preferred embodiment of the present invention, the blocking member is a solenoid valve or a check valve.
As a preferred scheme of the invention, the multi-connected refrigeration system further comprises a temperature measurement component, and the temperature measurement component can detect indoor and outdoor temperatures; the control device can control the work of the heat pipe refrigeration outer unit and the compression refrigeration outer unit according to the indoor temperature and the outdoor temperature measured by the temperature measuring component.
The invention also requests to protect a control method of the multi-connected refrigeration system, which is used for controlling the multi-connected refrigeration system, and the control method comprises the following steps:
s1, acquiring indoor temperature, outdoor temperature and total refrigerating capacity required by indoor cooling;
s2, selectively controlling the opening of the heat pipe refrigeration outer machine and/or the compression refrigeration outer machine according to the indoor temperature and the outdoor temperature;
and S3, selectively controlling the opening number of the heat pipe refrigeration modules on the heat pipe refrigeration outdoor unit and/or the opening number of the compression refrigeration modules on the compression refrigeration outdoor unit according to the total refrigeration capacity required by indoor cooling.
As a preferable aspect of the present invention, in step S2, when the indoor temperature is higher than the outdoor temperature, the heat pipe outdoor unit is turned on, and the compression outdoor unit is selectively turned on.
As a preferred scheme of the present invention, step S1 further includes obtaining a cooling capacity of each heat pipe cooling module of the heat pipe cooling outdoor unit when cooling the indoor space, and a cooling capacity of each compression cooling module of the compression cooling outdoor unit when cooling the indoor space; and in the step S2, when the sum of the indoor refrigerating capacity of each heat pipe refrigerating module on the heat pipe refrigerating external machine is less than the total indoor refrigerating capacity required by indoor cooling, the compression refrigerating external machine is started, otherwise, the compression refrigerating external machine is closed.
As a preferable embodiment of the present invention, in step S2, when the indoor temperature is lower than the outdoor temperature, the compression refrigeration outdoor unit is turned on, and the heat pipe refrigeration outdoor unit is turned off.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the multi-connected refrigeration system and the control method thereof, the heat pipe refrigeration outer machine and the compression refrigeration outer machine are arranged into a modular multi-connected structure and are respectively connected with the indoor machine through the first circulating pipeline and the second circulating pipeline, so that when the multi-connected refrigeration system works, the heat pipe refrigeration outer machine and the compression refrigeration outer machine can simultaneously work and refrigerate the indoor according to the requirements, and the advantage of low energy consumption of the heat pipe refrigeration outer machine is fully utilized; meanwhile, when the heat pipe refrigeration outer machine and the compression refrigeration outer machine work, heat exchange for indoor refrigeration is carried out indoors, so that heat exchange loss is avoided, and the multi-connected refrigeration system has the function of improving the refrigeration efficiency; the invention creatively adopts a plurality of refrigerating outer machines to jointly refrigerate the indoor machine, expands the capacity of the refrigerating system, can replace a plurality of existing refrigerating systems to be suitable for places with large refrigerating capacity demand, and has the functions of simplifying pipeline arrangement and facilitating operation and control.
Drawings
Fig. 1 is a schematic structural diagram of a multi-split refrigeration system according to an embodiment of the present invention.
10, an indoor unit; 11. an indoor unit module; 111. a first evaporator; 112. a first fan; 20. a heat pipe refrigerating external machine; 201. a first circulation line; 21. a heat pipe refrigeration module; 211. a first condenser; 212. a second fan; 30. compressing the refrigeration outdoor unit; 301. a second circulation line; 302. a branch line; 31. a compression refrigeration module; 311. a compressor; 312. a second condenser; 313. a first expansion valve; 314. an oil separator; 315. a gas-liquid separator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a multi-connected refrigeration system according to an embodiment of the present invention includes an indoor unit 10, a heat pipe refrigeration outdoor unit 20 and a compression refrigeration outdoor unit 30 respectively connected to the indoor unit 10, and a control device (not shown) for respectively opening and closing the heat pipe refrigeration outdoor unit 20 and the compression refrigeration outdoor unit 30.
In the present embodiment, the heat pipe refrigeration outdoor unit 20 includes a plurality of heat pipe refrigeration modules 21, and the plurality of heat pipe refrigeration modules 21 are connected in parallel and are respectively connected to the indoor unit 10 through a first circulation pipeline 201; the outdoor compression refrigeration unit 30 includes a plurality of compression refrigeration modules 31, and the plurality of compression refrigeration modules 31 are connected in parallel and are respectively connected to the indoor unit 10 through a second circulation pipe 301. When the multi-connected refrigeration system of the present embodiment works, each heat pipe refrigeration module 21 of the heat pipe refrigeration outdoor unit 20 can work to cool the indoor space through the first circulation pipeline 201 and the indoor unit 10, and each compression refrigeration module 31 of the compression refrigeration outdoor unit 30 can work to cool the indoor space through the second circulation pipeline 301 and the indoor unit 10. That is, the heat pipe refrigeration outdoor unit 20 and the compression refrigeration outdoor unit 30 of the present embodiment can operate independently, and cool the indoor space through the indoor unit 10, respectively, thereby avoiding heat exchange loss and improving the refrigeration efficiency of the multi-type refrigeration system.
The indoor unit 10 of the present embodiment includes a plurality of indoor unit modules 11, and the indoor unit modules 11 are arranged in parallel, wherein each indoor unit module 11 is connected and communicated with the first circulation pipeline 201 and the second circulation pipeline 301, respectively. That is to say, the multi-split refrigeration system of the embodiment adopts a multi-split mode, and the cooling capacities generated by the heat pipe refrigeration module 21 on the heat pipe refrigeration outdoor unit 20 and the compression refrigeration module 31 on the compression refrigeration outdoor unit 31 during operation are respectively transmitted to each indoor unit module 11 through the corresponding first circulation pipeline 201 and second circulation pipeline 301, and each indoor unit module 11 is cooled down.
Each indoor unit module 11 is provided with a control element (not shown), and the control element can control the opening and closing of the corresponding indoor unit module 11. The indoor unit modules 11 of the multi-connected refrigeration system of the present embodiment can selectively turn on specific indoor unit modules 11 according to the use requirements, so as to fully utilize the refrigeration capacity generated by the heat pipe refrigeration external unit 20 and the compression refrigeration external unit 20 during operation.
In the present embodiment, as a preferable aspect of the present invention, a blocking member (not shown) is provided in each of the branch pipes 302, which are connected to and communicate with the second circulation pipe 301, of the plurality of compression/refrigeration modules 31, and controls the opening and closing of the branch pipes. When the compression refrigeration module 31 of the external compression refrigeration unit 30 works, the blocking member may block the branch pipeline 302 corresponding to the compression refrigeration module 31 in the closed state, so that the refrigerant generated by the opened compression refrigeration module 31 during working can be completely introduced to the indoor unit 10 through the second circulation pipeline 301, thereby preventing the refrigerant from flowing back, and further improving the reliability of the external compression refrigeration unit 30 during working.
Specifically, the blocking member is provided as a solenoid valve or a check valve. When the blocking member is a one-way valve, the refrigerant on the compression and refrigeration module 31 can be led out to the second circulation line 301 through the branch line 302, and the refrigerant in the second circulation line 301 does not flow back to the corresponding compression and refrigeration module 31 through the branch line 302.
In this embodiment, the multi-connected refrigeration system further includes a temperature measurement component (not shown), the temperature measurement component can detect the outdoor temperature of the indoor unit, and the control device can control the operation of the heat pipe refrigeration outdoor unit 20 and the operation of the compression refrigeration outdoor unit 30 according to the indoor temperature and the outdoor temperature measured by the temperature measurement component. When the multi-connected refrigeration system of the embodiment works, the heat pipe refrigeration outer unit 20 is preferentially selected to work and refrigerate, and when the refrigeration generated by the work of the heat pipe refrigeration outer unit 20 is not enough to meet the requirement of indoor cooling, or the heat pipe refrigeration outer unit 20 does not work because the outdoor temperature is higher than the indoor temperature, the compression refrigeration outer unit 30 is controlled to work and refrigerate, so that the purpose of fully utilizing the advantage of low energy consumption of the heat pipe refrigeration outer unit 20 is achieved.
Each indoor unit module 11 of the indoor unit 10 in this embodiment includes a first evaporator 111 and a first fan 112, the first evaporator 111 is connected and communicated with the first circulation pipeline 201 and the second circulation pipeline 301, and an air inlet of the first fan 112 is disposed toward the first evaporator 111, so that when the multiple refrigeration system in this embodiment works, the heat pipe refrigeration outer unit 20 and the compression refrigeration outer unit 30 can cool the indoor air placed in the indoor unit module 11 through the first evaporator 111, specifically, under the flow guidance of the first fan 112, hot air passes through the first evaporator 111 and exchanges heat with the first evaporator 111, and is changed into cold air which is blown out, so as to achieve the effect of cooling the indoor. It should be noted that the first evaporator 111 of the present embodiment has two sets of heat exchange tube sets, and the two sets of heat exchange tube sets are independent from each other and are connected to the first circulation pipe 201 and the second circulation pipe 301 in a one-to-one correspondence.
The heat pipe cooling module 21 of the heat pipe cooling outdoor unit 20 of the present embodiment includes a first condenser 211 and a second fan 212, a height difference is provided between the first condenser 211 and the first evaporator 111, and the first condenser 211 and the first evaporator 111 are connected and communicated with each other through a first circulation pipe 201. When the heat pipe refrigeration module 21 is operated, the height difference between the first condenser 211 and the first evaporator 111 is used to provide power for the refrigerant to flow between the first condenser 211 and the first evaporator 111. When the heat pipe refrigeration module 21 works, a liquid refrigerant enters the first evaporator 111 through the first circulation pipeline 201 under the action of gravity and performs heat exchange with indoor air, the indoor air is cooled due to heat release, the liquid refrigerant is changed into a gaseous refrigerant due to heat absorption and then flows back to the first condenser 211 through the first circulation pipeline 201, the gaseous refrigerant performs heat exchange with outdoor air in the first condenser 211, and the gaseous refrigerant is changed into the liquid refrigerant due to heat release, so that a refrigeration cycle for cooling the indoor air is formed.
Each compression refrigeration module 31 of the compression refrigeration outdoor unit 30 of the present embodiment includes a compressor 311, a second condenser 312, and a first expansion valve 313, which are sequentially connected to each other, the first expansion valve 313 is disposed on the second circulation line 301, and is connected to the first evaporator 111, so that when the compression refrigeration module 31 of the present embodiment operates, the compressor 311, the second condenser 312, the first expansion valve 313, and the first evaporator 111 form a compression refrigeration cycle for cooling the indoor air. In the present embodiment, an oil separator 314 is connected between the compressor 311 and the second condenser 312, and a gas-liquid separator 315 is connected between the first evaporator 111 and the compressor 311.
The control method of the multi-connected refrigeration system provided by the invention comprises the following steps:
s1, acquiring indoor temperature, outdoor temperature and total refrigerating capacity required by indoor cooling; s2, selectively controlling the opening of the heat pipe refrigerating outer unit 20 and/or the compression refrigerating outer unit 30 according to the indoor temperature and the outdoor temperature; and S3, selecting the opening number of the heat pipe refrigeration modules 21 on the heat pipe refrigeration outdoor unit 20 and/or the opening number of the compression refrigeration modules 31 on the compression refrigeration outdoor unit 30 according to the total refrigerating capacity required by indoor cooling. That is to say, the multi-split refrigeration system of the embodiment selects the operation of the heat pipe refrigeration external unit 20 and the compression refrigeration external unit 30 according to the comparison between the indoor temperature to be cooled and the outdoor temperature, and the number of the heat pipe refrigeration modules 21 on the heat pipe refrigeration external unit 20 and the number of the compression refrigeration modules 31 on the compression refrigeration external unit are calculated according to the total indoor refrigerating capacity to be cooled and the indoor refrigerating capacity of each heat pipe refrigeration module 21 and each compression refrigeration module 31 when operating independently, so that the real-time feedback can be performed according to the indoor temperature to be cooled in the process. It should be noted that the indoor temperature is an indoor temperature to be subjected to cooling treatment when the multi-connected refrigeration system works, and includes an indoor air temperature corresponding to each indoor unit module in an on state; the outdoor temperature is the ambient temperature of the heat pipe compressor outdoor unit 20, the indoor air temperature and the outdoor ambient temperature can be measured by thermometers, and the total cooling capacity required for indoor cooling is the sum of the cooling capacities of the single indoor unit modules 11 to be cooled, wherein the cooling capacity of the single indoor unit module 11, that is, the real-time cooling capacity requirement of the single indoor unit module 11, can be obtained by certain calculation on the basis of collecting the return air temperature, the supply air temperature, the air volume and the external ambient temperature of the corresponding indoor unit module 11, and the description is not provided herein.
In this embodiment, the step S1 further includes obtaining the cooling capacity of each heat pipe cooling module 21 of the heat pipe cooling external machine 20 when cooling the room, and the cooling capacity of each compression cooling module 31 of the compression cooling external machine 20 when cooling the room, and the multi-connected cooling system of this embodiment may specifically set each heat pipe cooling module 21 of the heat pipe cooling external machine 20 and the cooling capacity of each compression cooling module 31 of the compression cooling external machine 30 when operating according to the indoor use requirement to be cooled, which is not described herein.
In step S2, when the indoor temperature is higher than the outdoor temperature, the heat-pipe outdoor unit 20 is turned on, and the compression-refrigeration outdoor unit 30 is selectively turned on. That is, when the outdoor temperature is lower than the indoor temperature, the heat pipe outdoor cooling unit 20 is preferably turned on, and whether the compression outdoor cooling unit 30 is turned on or not is selectively controlled according to actual needs.
Specifically, in the step S2, when the sum of the cooling capacities of the heat pipe refrigeration outdoor unit 20 at the time of opening each heat pipe refrigeration module 21 is smaller than the total cooling capacity required for cooling the indoor space, the compression refrigeration outdoor unit 30 is opened, so that the compression refrigeration outdoor unit 30 and the heat pipe refrigeration outdoor unit 20 work together, and otherwise, the compression refrigeration outdoor unit 30 is closed. That is, when the multi-split refrigeration system of the present embodiment is in operation, the heat pipe refrigeration module 21 is preferentially used to cool the indoor space, so as to achieve the purpose of fully utilizing the low energy consumption of the heat pipe refrigeration outdoor unit 20 during operation.
When the indoor temperature is lower than the outdoor temperature in step S2, the heat pipe outdoor unit 20 cannot cool the indoor temperature, so the compression outdoor unit 30 is turned on, and the heat pipe outdoor unit 20 is turned off.
In summary, the multi-connected refrigeration system and the control method thereof provided by the invention have the advantages that the heat pipe refrigeration outer machine and the compression refrigeration outer machine are set to be of a modular multi-connected structure and are respectively connected with the indoor machine through the first circulating pipeline and the second circulating pipeline, so that when the multi-connected refrigeration system works, the heat pipe refrigeration outer machine and the compression refrigeration outer machine can simultaneously work and refrigerate the indoor according to the requirements, and the advantage of low energy consumption of the heat pipe refrigeration outer machine is fully utilized; meanwhile, when the heat pipe refrigeration outer machine and the compression refrigeration outer machine work, heat exchange for indoor refrigeration is carried out indoors, so that heat exchange loss is avoided, and the multi-connected refrigeration system has the function of improving the refrigeration efficiency; the invention creatively adopts a plurality of refrigerating outer machines to jointly refrigerate the indoor machine, expands the capacity of the refrigerating system, can replace a plurality of existing refrigerating systems to be suitable for places with large refrigerating capacity demand, and has the functions of simplifying pipeline arrangement and facilitating operation and control.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A multiple refrigerant system, comprising: comprises that
An indoor unit;
the heat pipe refrigeration outdoor unit comprises a plurality of heat pipe refrigeration modules, and the plurality of heat pipe refrigeration modules are arranged in parallel and are respectively connected with the indoor unit through a first circulating pipeline;
the compression refrigeration outdoor unit comprises a plurality of compression refrigeration modules, and the compression refrigeration modules are arranged in parallel and are respectively connected with the indoor unit through second circulating pipelines;
and the control device can respectively control the opening and closing of each heat pipe refrigeration module on the heat pipe refrigeration external machine and each compression refrigeration module on the compression refrigeration external machine.
2. The multiple refrigerant system of claim 1, wherein: the indoor unit comprises a plurality of indoor unit modules, the indoor unit modules are arranged in parallel, and each indoor unit module is connected and communicated with the first circulating pipeline and the second circulating pipeline respectively.
3. The multiple refrigerant system of claim 2 wherein: and each indoor unit module is provided with a control element which can control the opening and closing of the corresponding indoor unit module.
4. The multiple refrigerant system of claim 1, wherein: the plurality of compression refrigeration modules are respectively connected and communicated with the second circulation pipeline through branch pipelines, and each branch pipeline is provided with a blocking piece for controlling the connection and disconnection of the branch pipeline.
5. The multiple refrigerant system of claim 4 wherein: the blocking piece is set as a solenoid valve or a one-way valve.
6. The multiple refrigerant system of claim 1, wherein: the multi-connected refrigeration system also comprises a temperature measurement component, and the temperature measurement component can detect indoor and outdoor temperatures; the control device can control the work of the heat pipe refrigeration outer unit and the compression refrigeration outer unit according to the indoor temperature and the outdoor temperature measured by the temperature measuring component.
7. A control method of a multi-connected refrigeration system is characterized in that: for controlling a multiple refrigeration system according to any one of claims 1 to 6, the control method comprising the steps of:
s1, acquiring indoor temperature, outdoor temperature and total refrigerating capacity required by indoor cooling;
s2, selectively controlling the opening of the heat pipe refrigeration outer machine and/or the compression refrigeration outer machine according to the indoor temperature and the outdoor temperature;
and S3, selectively controlling the opening number of the heat pipe refrigeration modules on the heat pipe refrigeration outdoor unit and/or the opening number of the compression refrigeration modules on the compression refrigeration outdoor unit according to the total refrigeration capacity required by indoor cooling.
8. The control method of the multiple refrigeration system according to claim 7, characterized in that: in step S2, when the indoor temperature is higher than the outdoor temperature, the heat pipe outdoor unit is turned on, and the compression outdoor unit is selectively turned on.
9. The control method of the multiple refrigeration system according to claim 8, wherein: step S1 further comprises the steps of obtaining the refrigerating capacity of each heat pipe refrigerating module on the heat pipe refrigerating outer machine when cooling the indoor space, and the refrigerating capacity of each compression refrigerating module on the compression refrigerating outer machine when cooling the indoor space; and in the step S2, when the sum of the indoor refrigerating capacity of each heat pipe refrigerating module on the heat pipe refrigerating external machine is less than the total indoor refrigerating capacity required by indoor cooling, the compression refrigerating external machine is started, otherwise, the compression refrigerating external machine is closed.
10. The control method of the multiple refrigeration system according to claim 7, characterized in that: and step S2, when the indoor temperature is lower than the outdoor temperature, the compression refrigeration outdoor unit is turned on, and the heat pipe refrigeration outdoor unit is turned off.
CN201910611525.1A 2019-07-08 2019-07-08 Multi-connected refrigeration system and control method thereof Pending CN112197372A (en)

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