CN109959097A - A centralized cold source refrigeration cycle system - Google Patents
A centralized cold source refrigeration cycle system Download PDFInfo
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- CN109959097A CN109959097A CN201910144930.7A CN201910144930A CN109959097A CN 109959097 A CN109959097 A CN 109959097A CN 201910144930 A CN201910144930 A CN 201910144930A CN 109959097 A CN109959097 A CN 109959097A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 24
- 239000011737 fluorine Substances 0.000 claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000000498 cooling water Substances 0.000 claims description 19
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000000844 transformation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
- F24F11/84—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 using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Chemical & Material Sciences (AREA)
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- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Mathematical Physics (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
本发明公开了一种集中式冷源制冷循环系统，系统包括直接制冷单元和集中式冷源机组；直接制冷单元包括制冷剂泵、储液器、水冷冷凝器A、蒸发器以及节流元件A；集中式冷源机组包括冷却塔、水冷冷凝器B、节流元件B、水氟换热器、压缩机以及三通阀I/II/III/IV；水冷冷凝器B、节流元件B、水氟换热器和压缩机依次相连构成制冷剂循环回路；三通阀I/II在水冷冷凝器B与冷却塔连接的管路上，三通阀III/IV在水冷冷凝器A与水氟换热器连接的管路上，三通阀I和IV相连，三通阀II和III相连。本发明通过室外集中式冷源机组为系统提供冷源，取消室内压缩机，降低了机组能耗，且能够充分利用室外自然冷源，提高机组全年能效比，从而达到节能的目的。
The invention discloses a centralized cold source refrigeration cycle system. The system includes a direct refrigeration unit and a centralized cold source unit; the direct refrigeration unit includes a refrigerant pump, a liquid accumulator, a water-cooled condenser A, an evaporator and a throttling element A ; Centralized cold source unit includes cooling tower, water-cooled condenser B, throttling element B, water-fluorine heat exchanger, compressor and three-way valve I/II/III/IV; water-cooled condenser B, throttling element B, The water-fluorine heat exchanger and the compressor are connected in sequence to form a refrigerant circulation loop; the three-way valve I/II is on the pipeline connecting the water-cooled condenser B and the cooling tower, and the three-way valve III/IV is in the water-cooled condenser A and the water-fluorine exchange. On the pipeline connected to the heater, three-way valves I and IV are connected, and three-way valves II and III are connected. The invention provides cold source for the system through the outdoor centralized cold source unit, cancels the indoor compressor, reduces the energy consumption of the unit, and can make full use of the outdoor natural cold source, improve the annual energy efficiency ratio of the unit, so as to achieve the purpose of energy saving.
Description
技术领域technical field
本发明属于制冷技术领域，具体涉及一种集中式冷源制冷循环系统。The invention belongs to the technical field of refrigeration, and in particular relates to a centralized cold source refrigeration cycle system.
背景技术Background technique
随着我国通信行业的高速发展，4G甚至5G的广泛使用，通信基站、机房得到了大规模的发展，通信企业的能耗问题越来越突出。据统计资料显示，机房空调的用电占到机房总用电量的40％以上。由于机房空调环境的特殊性，机房全年365天都需要制冷。在全年的部分时间机房外的自然冷空气是一个巨大的天然冷源，如果能合理的加以利用，机房空调的节能将存在很大的空间。With the rapid development of my country's communication industry, the widespread use of 4G and even 5G, communication base stations and computer rooms have been developed on a large scale, and the energy consumption problem of communication enterprises has become more and more prominent. According to statistics, the electricity consumption of air conditioners in the computer room accounts for more than 40% of the total electricity consumption in the computer room. Due to the particularity of the air-conditioning environment in the computer room, the computer room needs to be cooled 365 days a year. During part of the year, the natural cold air outside the computer room is a huge natural cold source. If it can be used reasonably, there will be a lot of space for energy saving of the computer room air conditioner.
目前常规的机房空调系统分为风冷型制冷系统，水冷型制冷系统，冷冻水型制冷系统，氟泵双循环制冷系统等。其中风冷型制冷系统和水冷型制冷系统常年采用压缩机进行制冷，系统能耗大，耗电量高。冷冻水型制冷系统存在水进机房的隐患。氟泵双循环制冷系统利用自然冷源，但是对于南方室外温度较高的地区，利用效率较低。而且对于冷凝器较为集中、极易产生热岛效应的场合，虽然室外温度较低，但是由于热岛效应，冷凝器的进风温度较高；实际使用氟泵的时间较短。At present, conventional computer room air conditioning systems are divided into air-cooled refrigeration systems, water-cooled refrigeration systems, chilled water refrigeration systems, and fluorine pump dual-cycle refrigeration systems. Among them, the air-cooled refrigeration system and the water-cooled refrigeration system use compressors for refrigeration all the year round, and the system consumes a lot of energy and electricity. The chilled water refrigeration system has the hidden danger of water entering the machine room. The fluorine pump dual-cycle refrigeration system utilizes the natural cold source, but the utilization efficiency is low for areas with high outdoor temperature in the south. Moreover, in the case where the condenser is concentrated and the heat island effect is easily generated, although the outdoor temperature is low, the inlet air temperature of the condenser is high due to the heat island effect; the actual use time of the fluorine pump is short.
发明内容SUMMARY OF THE INVENTION
发明目的：针对上述现有技术的不足，本发明目的在于提供一种集中式冷源制冷循环系统，通过室外集中式冷源机组为系统提供冷源，取消室内压缩机，降低机组能耗；充分利用室外自然冷源，提高机组全年能效比，从而达到节能的目的。Purpose of the invention: In view of the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a centralized cold source refrigeration cycle system, which provides a cold source for the system through an outdoor centralized cold source unit, cancels the indoor compressor, and reduces the energy consumption of the unit; sufficient The use of outdoor natural cold sources can improve the annual energy efficiency ratio of the unit, so as to achieve the purpose of energy saving.
技术方案：为实现上述发明目的，本发明采用如下技术方案：Technical scheme: In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical scheme:
一种集中式冷源制冷循环系统，包括直接制冷单元和集中式冷源机组；所述直接制冷单元包括依次相连构成直接制冷循环系统的制冷剂泵、储液器、水冷冷凝器A、蒸发器以及节流元件A；所述集中式冷源机组包括冷却塔、水冷冷凝器B、节流元件B、水氟换热器、压缩机以及三通阀I/II/III/IV；水冷冷凝器B、节流元件B、水氟换热器和压缩机依次相连构成制冷剂循环回路；三通阀I的端口A与水冷冷凝器B的冷却水进口相连，端口B与冷却塔的冷却水出口相连，三通阀II的端口A与水冷冷凝器B的冷却水出口相连，端口B与冷却塔的冷却水进口相连；三通阀III的端口A与水冷冷凝器A的冷却水出口相连，端口B与三通阀II的端口C相连，三通阀IV的端口A与水冷冷凝器A的冷却水进口相连，端口B与三通阀I的端口C相连；三通阀III的端口C与水氟换热器的回水口相连，三通阀IV的端口C与水氟换热器的出水口相连。A centralized cold source refrigeration cycle system includes a direct refrigeration unit and a centralized cold source unit; the direct refrigeration unit includes a refrigerant pump, a liquid accumulator, a water-cooled condenser A, an evaporator that are connected in sequence to form a direct refrigeration cycle system and throttling element A; the centralized cold source unit includes a cooling tower, a water-cooled condenser B, a throttling element B, a water-fluorine heat exchanger, a compressor, and a three-way valve I/II/III/IV; a water-cooled condenser B. The throttling element B, the water-fluorine heat exchanger and the compressor are connected in sequence to form a refrigerant circulation loop; the port A of the three-way valve I is connected with the cooling water inlet of the water-cooled condenser B, and the port B is connected with the cooling water outlet of the cooling tower Connected, the port A of the three-way valve II is connected to the cooling water outlet of the water-cooled condenser B, and the port B is connected to the cooling water inlet of the cooling tower; the port A of the three-way valve III is connected to the cooling water outlet of the water-cooled condenser A, the port B is connected to port C of three-way valve II, port A of three-way valve IV is connected to the cooling water inlet of water-cooled condenser A, port B is connected to port C of three-way valve I; port C of three-way valve III is connected to water The return port of the fluorine heat exchanger is connected, and the port C of the three-way valve IV is connected with the water outlet of the water-fluorine heat exchanger.
在具体实施方案中，一台集中式冷源机组可以连接多台直接制冷单元。In a specific embodiment, a centralized cold source unit can be connected to multiple direct refrigeration units.
在具体实施方案中，直接制冷单元可位于室内，或者，将直接制冷单元的蒸发器以及节流元件A置于室内，制冷剂泵、储液器和水冷冷凝器A置于室外。In specific embodiments, the direct refrigeration unit may be located indoors, or the evaporator and throttling element A of the direct refrigeration unit may be located indoors, and the refrigerant pump, accumulator and water-cooled condenser A may be located outdoors.
在具体实施方案中，所述冷却塔可为闭式冷却塔或开式冷却塔。In specific embodiments, the cooling tower may be a closed cooling tower or an open cooling tower.
在优选实施方案中，所述压缩机为变频压缩机。In a preferred embodiment, the compressor is an inverter compressor.
所述集中式冷源制冷循环系统可根据室外温度的不同分为水冷压缩机制冷循环和自然冷却制冷循环两种工作模式，在水冷压缩机制冷循环工作模式下，三通阀I和II的端口A和B连通，端口C关闭，三通阀III和IV的端口A和C连通，端口B关闭；在自然冷却制冷循环工作模式下，水冷冷凝器B、节流元件B、水氟换热器和压缩机构成的制冷剂循环回路关闭，三通阀I和II的端口B和C连通，端口A关闭，三通阀III和IV的端口A和B连通，端口C关闭。The centralized cold source refrigeration cycle system can be divided into two working modes: water-cooled compressor refrigeration cycle and natural cooling refrigeration cycle according to different outdoor temperatures. A and B are connected, port C is closed, ports A and C of three-way valves III and IV are connected, and port B is closed; in the working mode of natural cooling refrigeration cycle, water-cooled condenser B, throttling element B, water-fluorine heat exchanger The refrigerant circulation circuit formed with the compressor is closed, the ports B and C of the three-way valves I and II are connected, the port A is closed, the ports A and B of the three-way valves III and IV are connected, and the port C is closed.
有益效果：本发明提供的集中式冷源制冷循环系统，在直接制冷单元中，制冷剂通过蒸发器进行蒸发吸热，对房间中的空气进行冷却，蒸发后的制冷剂蒸汽经过水冷冷凝器进行冷却降温后，进出储液器，并在制冷剂泵的作用下循环流至室内，经过节流元件的节流降压后重新进入蒸发器进行蒸发吸热，构成整个循环。室内直接制冷单元取消压缩机，有效降低了机组能耗。集中式冷源机组的主要目的是提供低温的冷源水，通过水冷冷凝器将直接制冷单元中的热量带走，避免风冷冷凝器产生的热岛效应。并且集中式冷源机组可根据室外温度的不同，采用不同的循环管路进行工作，分为水冷压缩机制冷循环和自然冷却制冷循环两种工作模式，能够充分利用室外自然冷源，提高机组全年能效比，从而达到节能的目的。Beneficial effects: In the centralized cold source refrigeration cycle system provided by the present invention, in the direct refrigeration unit, the refrigerant evaporates and absorbs heat through the evaporator, cools the air in the room, and the evaporated refrigerant vapor passes through the water-cooled condenser for cooling. After cooling and cooling, it enters and exits the accumulator, and circulates to the room under the action of the refrigerant pump. After the throttling and depressurization of the throttling element, it re-enters the evaporator for evaporation and heat absorption, forming the entire cycle. The indoor direct refrigeration unit cancels the compressor, which effectively reduces the energy consumption of the unit. The main purpose of the centralized cold source unit is to provide low-temperature cold source water, and the heat in the direct refrigeration unit is taken away through the water-cooled condenser to avoid the heat island effect generated by the air-cooled condenser. In addition, the centralized cold source unit can work with different circulation pipelines according to the difference of outdoor temperature. Annual energy efficiency ratio, so as to achieve the purpose of energy saving.
附图说明Description of drawings
图1为本发明实施例的系统原理图。FIG. 1 is a schematic diagram of a system according to an embodiment of the present invention.
图2为本发明实施例一种工作模式循环示意图。FIG. 2 is a schematic diagram of a working mode cycle according to an embodiment of the present invention.
图3为本发明实施例另一种工作模式循环示意图。FIG. 3 is a schematic diagram of another working mode cycle according to an embodiment of the present invention.
图4为本发明实施例连接多个直接制冷单元的系统原理图。FIG. 4 is a schematic diagram of a system for connecting multiple direct refrigeration units according to an embodiment of the present invention.
图中：11-制冷剂泵，12-储液器，13-水冷冷凝器A，14-蒸发器，15-节流元件A，20-冷却塔，21-水冷冷凝器B，22-节流元件B，23-水氟换热器，24-变频压缩机，31-三通阀I，32-三通阀II，33-三通阀III，34-三通阀IV。In the figure: 11-refrigerant pump, 12-liquid accumulator, 13-water-cooled condenser A, 14-evaporator, 15-throttle element A, 20-cooling tower, 21-water-cooled condenser B, 22-throttle Component B, 23-water-fluorine heat exchanger, 24-inverter compressor, 31-three-way valve I, 32-three-way valve II, 33-three-way valve III, 34-three-way valve IV.
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明作进一步详细的说明。The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
如图1所示、本发明实施例公开的一种集中式冷源制冷循环系统主要由直接制冷单元和集中式冷源机组组成。其中直接制冷单元主要部件有制冷剂泵11、储液器12、水冷冷凝器A 13、蒸发器14以及节流元件A 15，集中式冷源机组主要部件有冷却塔20、水冷换热器B 21、节流元件B 22、水氟换热器23、高效变频压缩机24以及三通阀I/II/III/IV(31/32/33/34)。直接制冷单元中制冷剂泵11、储液器12、水冷冷凝器A 13、蒸发器14以及节流元件A15通过管路相连，构成直接制冷循环系统，直接制冷单元可以全部位于室内；也可以仅将蒸发器14和节流元件A15放置于室内，其他部件放置于室外，减小室内机组的占地空间。As shown in FIG. 1 , a centralized cold source refrigeration cycle system disclosed in an embodiment of the present invention is mainly composed of a direct refrigeration unit and a centralized cold source unit. The main components of the direct refrigeration unit include a refrigerant pump 11, a liquid accumulator 12, a water-cooled condenser A 13, an evaporator 14 and a throttling element A 15, and the main components of the centralized cold source unit include a cooling tower 20, a water-cooled heat exchanger B 21. Throttle element B 22, water-fluorine heat exchanger 23, high-efficiency inverter compressor 24 and three-way valve I/II/III/IV (31/32/33/34). In the direct refrigeration unit, the refrigerant pump 11, the liquid accumulator 12, the water-cooled condenser A13, the evaporator 14 and the throttling element A15 are connected by pipelines to form a direct refrigeration cycle system. The direct refrigeration units can all be located indoors; The evaporator 14 and the throttling element A15 are placed indoors, and other components are placed outdoors to reduce the footprint of the indoor unit.
集中式冷源机组的水冷冷凝器B21、节流元件B22、水氟换热器23和压缩机24通过管路相连构成制冷剂循环回路；三通阀I31的端口A(采用A/B/C区分三通阀的不同端口)与水冷冷凝器B21的冷却水进口相连，端口B与冷却塔20的冷却水出口相连，三通阀II32的端口A与水冷冷凝器B21的冷却水出口相连，端口B与冷却塔20的冷却水进口相连；三通阀III33的端口A与水冷冷凝器A13的冷却水出口相连，端口B与三通阀II32的端口C相连，三通阀IV34的端口A与水冷冷凝器A13的冷却水进口相连，端口B与三通阀I31的端口C相连；三通阀III33的端口C与水氟换热器23的回水口相连，三通阀IV的端口C与水氟换热器23的出水口相连。The water-cooled condenser B21, throttling element B22, water-fluorine heat exchanger 23 and compressor 24 of the centralized cold source unit are connected by pipelines to form a refrigerant circulation loop; port A of the three-way valve I31 (using A/B/C Different ports of the three-way valve) are connected to the cooling water inlet of the water-cooled condenser B21, port B is connected to the cooling water outlet of the cooling tower 20, port A of the three-way valve II32 is connected to the cooling water outlet of the water-cooled condenser B21, the port B is connected to the cooling water inlet of the cooling tower 20; the port A of the three-way valve III33 is connected to the cooling water outlet of the water-cooled condenser A13, the port B is connected to the port C of the three-way valve II32, and the port A of the three-way valve IV34 is connected to the water cooling The cooling water inlet of the condenser A13 is connected, the port B is connected with the port C of the three-way valve I31; the port C of the three-way valve III33 is connected with the return port of the water-fluorine heat exchanger 23, and the port C of the three-way valve IV is connected with the water-fluorine The water outlet of the heat exchanger 23 is connected.
根据室外温度的不同，集中式冷源机组采用不同的循环管路进行工作，分为两种工作模式。According to the difference of outdoor temperature, the centralized cold source unit uses different circulation pipelines to work, and it is divided into two working modes.
工作模式一：水冷压缩机制冷循环模式。Working mode 1: water-cooled compressor refrigeration cycle mode.
在室外温度较高的季节，集中式冷源机组通过工作模式一提供低温的冷源水，整个循环如图2所示。该模式下，三通阀I和II的端口A和B连通，端口C关闭，三通阀III和IV的端口A和C连通，端口B关闭。集中式冷源机组中的冷源水经过直接制冷单元中的水冷冷凝器A13将直接制冷单元的制冷剂进行冷却冷凝，其自身水升温后进入集中式冷源机组的水氟换热器23，通过水氟换热器23的制冷剂的蒸发吸热为直接制冷单元提供低温的冷源水。In the season with high outdoor temperature, the centralized cold source unit provides cold source water with low temperature through working mode 1, and the whole cycle is shown in Figure 2. In this mode, ports A and B of three-way valves I and II are connected, and port C is closed, and ports A and C of three-way valves III and IV are connected, and port B is closed. The cold source water in the centralized cold source unit passes through the water-cooled condenser A13 in the direct refrigeration unit to cool and condense the refrigerant of the direct refrigeration unit. The evaporation and heat absorption of the refrigerant through the water-fluorine heat exchanger 23 provides low-temperature cold source water for the direct refrigeration unit.
水氟换热器23的制冷剂的吸热蒸发后，进入高效变频器压缩机24进行压缩，而后变为高温高压的制冷剂蒸汽，进入集中式冷源机组的水冷换热器B 21进行冷却冷凝(其冷量来源于冷却塔20，冷却塔20可以是闭式冷却塔也可以是开式冷却塔)，冷凝后的制冷剂液体经过管路及节流元件B22，重新进入水氟换热器23，进行吸热蒸发，如此循环。After the endothermic evaporation of the refrigerant in the water-fluorine heat exchanger 23, it enters the high-efficiency inverter compressor 24 for compression, and then becomes a high-temperature and high-pressure refrigerant vapor, which enters the water-cooled heat exchanger B 21 of the centralized cold source unit for cooling. Condensation (the cooling capacity comes from the cooling tower 20, the cooling tower 20 can be a closed cooling tower or an open cooling tower), the condensed refrigerant liquid passes through the pipeline and the throttling element B22, and re-enters the water-fluorine heat exchange device 23 to perform endothermic evaporation, and so on.
工作模式二：自然冷却制冷循环模式。Working mode two: natural cooling refrigeration cycle mode.
在室外温度或者湿球温度较低的季节，集中式冷源机组的压缩机停止工作，集中式冷源机组通过工作模式二提供低温的冷源水，其循环如图3所示。该模式下，三通阀I和II的端口B和C连通，端口A关闭，三通阀III和IV的端口A和B连通，端口C关闭。集中式冷源机组中的冷源水经过直接制冷单元中的水冷冷凝器A13将制冷换热单元的制冷剂进行冷却冷凝，其自身水升温后直接进入冷却塔进行冷却，产生低温的冷却水。In the season when the outdoor temperature or wet bulb temperature is low, the compressor of the centralized cold source unit stops working, and the centralized cold source unit provides low-temperature cold source water through working mode 2, and its cycle is shown in Figure 3. In this mode, ports B and C of three-way valves I and II are connected, and port A is closed, and ports A and B of three-way valves III and IV are connected, and port C is closed. The cold source water in the centralized cold source unit is cooled and condensed by the water-cooled condenser A13 in the direct refrigeration unit to cool and condense the refrigerant of the refrigeration heat exchange unit. After its own water is heated up, it directly enters the cooling tower for cooling, producing low-temperature cooling water.
本发明实施例的集中式冷源制冷循环系统中，一台集中式冷源机组可以连接多台直接制冷单元，如图4所示。In the centralized cold source refrigeration cycle system of the embodiment of the present invention, one centralized cold source unit can be connected to multiple direct refrigeration units, as shown in FIG. 4 .
以上详细描述了本发明的优选实施方式，但是，本发明并不限于上述实施方式中的具体细节，在本发明的技术构思范围内，可以对本发明的技术方案进行多种等同变换，这些等同变换均属于本发明的保护范围。The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention. These equivalent transformations All belong to the protection scope of the present invention.
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