CN111565546A - Oil-free efficient refrigeration system for data center and control method thereof - Google Patents
Oil-free efficient refrigeration system for data center and control method thereof Download PDFInfo
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- CN111565546A CN111565546A CN202010475842.8A CN202010475842A CN111565546A CN 111565546 A CN111565546 A CN 111565546A CN 202010475842 A CN202010475842 A CN 202010475842A CN 111565546 A CN111565546 A CN 111565546A
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- 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
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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
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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
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- 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
- H05K7/208—Liquid cooling with phase change
- H05K7/20827—Liquid cooling with phase change within rooms for removing heat from cabinets, e.g. air conditioning devices
Abstract
The invention discloses an oil-free efficient refrigerating system for a data center, which comprises a plurality of outdoor condensing modules, a plurality of indoor evaporating modules and a liquid-collecting gas-distributing liquid-supplying module; the air outlet of the compressor of each outdoor condensing module is connected with the inlets of the one-way valve, the condenser, the liquid storage device, the outdoor refrigerant pump and the outdoor expansion valve in sequence; a first check valve is connected in parallel between the compressor and the check valve; the outdoor refrigerant pump is connected with the second one-way valve in parallel; the inlet of the evaporator in each indoor evaporation module is connected with the outlet of the indoor expansion valve; the liquid outlet, the liquid inlet, the gas outlet, the liquid inlet and the liquid outlet of a liquid collecting and gas distributing device in the liquid collecting and gas distributing liquid supply module are connected with the inlet of the refrigerant pump, the outlet of the outdoor expansion valve, the air suction port of the compressor and the outlet of the evaporator in a one-to-one correspondence manner; the outlets of the refrigerant pumps are connected to the inlets of the indoor expansion valves, respectively. The invention also discloses a control method of the oil-free efficient refrigeration system for the data center. The invention can realize low-energy-consumption operation of the system.
Description
Technical Field
The invention relates to an oil-free efficient refrigeration system for a data center and a control method thereof.
Background
The scale and the number of the data centers are rapidly developed and become large power consumers of the information society. In order to ensure efficient and reliable operation of the data center, heat generated by the servers of the data center during operation needs to be rapidly exhausted. According to statistics, the electricity consumption of the modern social data center accounts for 5% of the total electricity of the whole society. The IDC industry research report shows that when the electricity consumption of the Chinese data center in 2018 exceeds 1500 hundred million kilowatts, the energy consumption of the air conditioners of the machine room and the base station accounts for 40-50% of the total energy consumption according to statistics. In order to reduce the energy consumption of the data center and reasonably configure social resources, an air conditioning system of the data center needs to be optimized, especially a natural cold source needs to be fully utilized, and the high energy efficiency characteristic of a refrigerating system is fully exerted. The existing refrigerating system for the data center also has the problems of low refrigerating efficiency and oil return in the operation process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an oil-free high-efficiency refrigeration system for a data center and a control method thereof, which can operate in different modes according to outdoor temperature, realize low-energy-consumption operation of the system and improve the safety of the system.
One technical scheme for achieving the purpose of the invention is as follows: an oil-free efficient refrigeration system for a data center comprises a plurality of outdoor condensation modules, a plurality of indoor evaporation modules and a liquid-collecting gas-distributing liquid-supplying module; wherein the content of the first and second substances,
each outdoor condensing module comprises a compressor, a one-way valve, a condenser, a liquid storage device, an outdoor refrigerant pump and an outdoor expansion valve; the air outlet of the compressor is connected with the one-way valve, the outlet of the one-way valve is connected with the condenser, the outlet of the condenser is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is connected with the inlet of the outdoor refrigerant pump, and the outlet of the outdoor refrigerant pump is connected with the inlet of the outdoor expansion valve; a first one-way valve is connected in parallel between the air suction port of the compressor and the outlet of the one-way valve; a second one-way valve is connected in parallel between the inlet and the outlet of the outdoor refrigerant pump;
each indoor evaporation module comprises an evaporator and an indoor expansion valve; the inlet of the evaporator is connected with the outlet of the indoor expansion valve;
the liquid collecting, gas distributing and liquid supplying module comprises a liquid collecting and gas distributing device and a refrigerant pump, wherein liquid inlets of the liquid collecting and gas distributing device are respectively connected with outlets of outdoor expansion valves of the outdoor condensation modules, gas outlets of the liquid collecting and gas distributing device are respectively connected with air suction ports of compressors of the outdoor condensation modules, gas inlets of the liquid collecting and gas distributing device are respectively connected with outlets of evaporators of the indoor evaporation modules, and liquid outlets of the liquid collecting and gas distributing device are connected with inlets of the refrigerant pump; and outlets of the refrigerant pumps are respectively connected with inlets of the indoor expansion valves of the plurality of indoor evaporation modules.
The oil-free high-efficiency refrigeration system for the data center is characterized in that the compressor in each outdoor condensation module is an oil-free compressor; the condenser adopts an indirect evaporative condenser or an air-cooled condenser.
The oil-free high-efficiency refrigeration system for the data center is characterized in that the evaporator in each indoor evaporation module adopts a coil heat exchanger and a fan or a micro-channel heat exchanger and a fan, and each indoor evaporation module further comprises a first ball valve arranged on the liquid pipe and a second ball valve arranged on the air pipe.
The oil-free efficient refrigeration system for the data center is characterized in that the refrigerant pump in the liquid collecting, gas distributing and liquid supplying module is formed by connecting a plurality of refrigerant pumps in parallel.
The other technical scheme for realizing the purpose of the invention is as follows: a control method based on an oil-free efficient refrigeration system for a data center is as follows:
when no natural cold source exists outdoors, namely the outdoor temperature is higher than T1, the system operates in a refrigeration mode, namely a plurality of outdoor condensation modules all operate in the refrigeration mode; the compressor discharges high-temperature and high-pressure gaseous refrigerant, the gaseous refrigerant enters the condenser through the one-way valve, the gaseous refrigerant is condensed into liquid refrigerant and then enters the liquid storage device, the compression ratio of the system is larger than a set value, so that the outdoor refrigerant pump does not run, the refrigerant directly enters the outdoor expansion valve through the second one-way valve which is connected with the outdoor refrigerant pump in parallel to carry out throttling and pressure reduction, the refrigerant enters the liquid collecting and gas distributing device in the liquid collecting and gas distributing liquid supply module, the low-temperature and low-pressure liquid refrigerant output by the liquid collecting and gas distributing device enters the indoor evaporation module again through the refrigerant pump, and the low-temperature and low-pressure liquid refrigerant enters the; the gas refrigerant after evaporation and heat absorption is subjected to gas-liquid separation through the liquid collecting and gas distributing device, and the separated gas refrigerant enters an air suction port of a compressor of the outdoor condensation module to complete circulation;
when a certain natural cold source exists outdoors, namely the outdoor temperature is less than T1 and greater than T2, the system operates in a compressor refrigeration and natural cooling refrigeration mode, namely one part of outdoor condensation modules operates in a natural cooling mode, and the other part of outdoor condensation modules operates in a refrigeration mode; the operation mode of a part of outdoor condensation modules operating in the refrigeration mode is as follows: the compressor discharges high-temperature and high-pressure gaseous refrigerant, the gaseous refrigerant enters the condenser through the one-way valve, the gaseous refrigerant is condensed into liquid refrigerant and then enters the liquid storage device, the compression ratio is smaller than a set value, so that the outdoor refrigerant pump is opened to operate, the refrigerant enters the outdoor expansion valve through the pressurization effect of the outdoor refrigerant pump for throttling and reducing pressure and enters the liquid collecting and gas distributing and gas supplying device in the liquid collecting and gas distributing and liquid supplying module, the low-temperature and low-pressure liquid refrigerant enters the indoor evaporation module again through the refrigerant pump in the liquid collecting and gas distributing and liquid supplying module, and the low-temperature and low-pressure liquid refrigerant enters the evaporator after the flow; the other outdoor condensation module operating in the natural cooling mode operates in the following mode: the gas refrigerant after the heat absorption of the self-evaporator is evaporated passes through a liquid collecting and gas distributing device in a liquid collecting and gas distributing module, the compressor does not work at the moment, the gas refrigerant directly enters a condenser through a first one-way valve connected with the compressor in parallel, the gas refrigerant is condensed into liquid refrigerant under the action of a natural cold source and enters a liquid storage device, an outdoor refrigerant pump runs at the moment, the refrigerant enters an outdoor expansion valve after being pressurized through the outdoor refrigerant pump, the refrigerant enters the liquid collecting and gas distributing and liquid supplying device in the liquid collecting and gas distributing and liquid supplying module without throttling and pressure reduction, the low-temperature low-pressure liquid refrigerant enters an indoor evaporation module again through a refrigerant pump in the liquid collecting and gas distributing and liquid supplying module, the low-temperature low-pressure liquid refrigerant enters the evaporator after the flow; the gas refrigerant after evaporation and heat absorption is subjected to gas-liquid separation through a liquid collecting and gas distributing device in the liquid collecting and gas distributing module, and the separated gas refrigerant enters a condenser of the outdoor condensing module through a first one-way valve to complete circulation;
when the outdoor has enough natural cold source, namely the outdoor temperature is less than T2, the system operates in a natural cooling mode, namely the outdoor condensing modules all operate in the natural cooling mode; the gas refrigerant after the heat absorption of the self-evaporator is evaporated passes through a liquid collecting and gas distributing device in a liquid collecting and gas distributing module, the compressor does not work at the moment, the gas refrigerant directly enters a condenser through a one-way valve connected with the compressor in parallel, the gas refrigerant is condensed into a liquid refrigerant under the action of a natural cold source and enters a liquid storage device, an outdoor refrigerant pump is opened to operate at the moment, the refrigerant enters an outdoor expansion valve after being pressurized through the outdoor refrigerant pump, the refrigerant enters the liquid collecting and gas distributing device in the liquid collecting and gas distributing liquid supply module without throttling and pressure reduction, the low-temperature low-pressure liquid refrigerant enters an indoor evaporation module again through a refrigerant pump in the liquid collecting and gas distributing liquid supply module, the low-temperature low-pressure liquid refrigerant enters the evaporator after the flow; the gaseous refrigerant after evaporation and heat absorption passes through a liquid collecting and gas distributing device in the liquid collecting and gas distributing module, and the separated gaseous refrigerant enters the condenser through a first one-way valve of the outdoor condensation module to complete circulation.
The oil-free efficient refrigeration system for the data center and the control method thereof have the following characteristics:
1) can operate in different modes according to outdoor temperature to realize low-energy-consumption operation of the system
2) The compressor in each outdoor condensing module adopts an oil-free compressor, so that the operation efficiency of the compressor can be improved, and the problem of oil return in the operation process of the system can be solved;
3) the condenser in the outdoor condensing module adopts an indirect evaporative condenser, which can help to obtain outdoor very low condensing pressure and greatly improve the refrigeration performance of the system;
4) because each outdoor condensing module adopts an outdoor refrigerant pump, the system can be helped to provide refrigerant under the condition of low compression ratio of the system, and the installation height of the liquid collecting, gas distributing and liquid supplying module is not limited;
5) the outdoor condensing modules can supply cold in a centralized manner and can also operate independently, and mutual backup can be achieved, so that the system can obtain more efficient refrigerating performance by selecting the optimal operation mode of each outdoor condensing module;
6) the liquid collection and gas distribution liquid supply module can realize the functions of centralized liquid supply and gas distribution as required, so that the outdoor condensation module and the indoor evaporation module are unrelated, the centralized management can be realized, and the safety of the system is improved;
7) the condenser in the outdoor condensing module can also adopt an air-cooled condenser, the outdoor condensing module with the air-cooled condenser can be preferentially used for natural cooling and cold supply in winter, and insufficient cold energy is refrigerated and supplemented by a compressor of the outdoor condensing module with the indirect evaporative condenser, so that the effects of anti-freezing machine and water saving are achieved.
Drawings
Fig. 1 is a schematic structural diagram of an oil-free high-efficiency refrigeration system for a data center according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, the oil-free high-efficiency refrigeration system for a data center of the present invention includes a plurality of outdoor condensing modules 100, a plurality of indoor evaporating modules 200, and a liquid-collecting, gas-distributing and liquid-supplying module 300.
Each outdoor condensing module 100 includes a compressor 11, a check valve 12, a condenser 13, an accumulator 14, an outdoor refrigerant pump 15, and an outdoor expansion valve 16; wherein, the compressor 11 adopts an oil-free compressor; the condenser 13 adopts an indirect evaporative condenser or an air-cooled condenser 13'; an exhaust port of the compressor 11 is connected with a check valve 12, an outlet of the check valve 12 is connected with a condenser 13, an outlet of the condenser 12 is connected with an inlet of a liquid storage device 14, an outlet of the liquid storage device 14 is connected with an inlet of an outdoor refrigerant pump 15, and an outlet of the outdoor refrigerant pump 15 is connected with an inlet of an outdoor expansion valve 16; a first one-way valve 17 is also connected in parallel between the air suction port of the compressor 11 and the outlet of the one-way valve; a second check valve 18 is connected in parallel between the inlet and outlet of the outdoor refrigerant pump 15.
Each indoor evaporation module 200 includes an evaporator 21, an indoor expansion valve 22, a first ball valve 23, and a second ball valve 24; wherein, the evaporator 21 adopts a coil heat exchanger and a fan or a micro-channel heat exchanger and a fan; an inlet of the evaporator 21 is connected to an outlet of the indoor expansion valve 22, and a first ball valve 23 is installed on the liquid pipe; the second ball valve 24 is mounted on the air pipe.
The liquid collecting, distributing and supplying module 300 comprises a liquid collecting, distributing and supplying device 31 and a refrigerant pump 32, wherein the refrigerant pump 32 is formed by connecting a plurality of refrigerant pumps in parallel; the liquid inlets of the liquid and gas collecting and distributing device 31 are respectively connected with the outlets of the outdoor expansion valves 16 of the outdoor condensation modules 100, the gas outlets of the liquid and gas collecting and distributing device 31 are respectively connected with the air suction ports of the compressors 11 of the outdoor condensation modules 100, the gas inlets of the liquid and gas collecting and distributing device 31 are respectively connected with the outlets of the evaporators 21 of the indoor evaporation modules 200, and the liquid outlets of the liquid and gas collecting and distributing device 31 are connected with the inlet of the refrigerant pump 32; the outlets of the refrigerant pumps 32 are connected to the inlets of the indoor expansion valves 32 of the plurality of indoor evaporation modules 200, respectively. The refrigerant pump in the liquid collecting, gas distributing and liquid supplying module consists of a plurality of refrigerant pumps connected in parallel.
The invention discloses a control method of an oil-free efficient refrigeration system for a data center, which is based on the oil-free efficient refrigeration system for the data center, and the control method comprises the following steps:
when no natural cold source exists outdoors, namely the outdoor temperature is higher than T1, the system operates in a cooling mode, namely the outdoor condensing modules 100 all operate in the cooling mode; the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 11 enters the condenser 13 through the one-way valve 12, and is condensed into a liquid refrigerant, and then enters the liquid storage device 14, because the compression ratio of the system is greater than a set value at this time, the outdoor refrigerant pump 15 does not operate, the refrigerant directly enters the outdoor expansion valve 16 through the second one-way valve 18 connected with the outdoor refrigerant pump 15 in parallel for throttling and pressure reduction, and enters the liquid and gas collecting and distributing device 31 in the liquid and gas distributing and liquid supplying module 300, the low-temperature and low-pressure liquid refrigerant output by the liquid and gas collecting and distributing device 31 enters the indoor evaporation module 200 again through the refrigerant pump 32, and enters the evaporator 21 after the flow is regulated by the indoor expansion valve; the gas refrigerant after evaporation and heat absorption is subjected to gas-liquid separation through the liquid collecting and gas distributing device 31, and the separated gas refrigerant enters the air suction port of the compressor 11 of the outdoor condensation module 100 to complete circulation;
when a certain natural cold source exists outdoors, namely the outdoor temperature is less than T1 and greater than T2, the system operates in a compressor refrigeration and natural cooling refrigeration mode, namely a part of outdoor condensation modules 100 operate in a natural cooling mode, and the other part of outdoor condensation modules 100 operate in a refrigeration mode; a part of the outdoor condensing module 100 operating in the cooling mode operates as follows: the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 11 enters the condenser 13 through the one-way valve 12, and is condensed into a liquid refrigerant, and then enters the liquid storage device 14, because the compression ratio of the system is smaller than a set value, the outdoor refrigerant pump 15 is opened to operate, the refrigerant enters the outdoor expansion valve through the pressurization effect of the outdoor refrigerant pump 15, is throttled by the throttle 16 and is reduced in pressure, enters the liquid collecting and gas distributing device 31 in the liquid collecting and gas distributing and liquid supplying module 300, the low-temperature and low-pressure liquid refrigerant enters the indoor evaporation module 200 again through the refrigerant pump 32 in the liquid collecting and gas distributing and liquid supplying module 300, and enters the evaporator 21 after the flow is regulated by the indoor expansion; the other outdoor condensing module 100 operating in the natural cooling mode operates as follows: the gaseous refrigerant after the heat absorption by the evaporator 21 is evaporated passes through the liquid collecting and gas distributing device 31 in the liquid collecting and gas distributing module 300, at this time, the compressor 11 does not work, the gaseous refrigerant directly enters the condenser 13 through the first check valve 17 connected with the compressor 11 in parallel, the refrigerant is condensed into liquid refrigerant to enter the liquid storage device 14 under the action of a natural cold source, because the compression ratio of the system is smaller than a set value at the moment, the outdoor refrigerant pump 15 is opened to operate, the refrigerant enters the outdoor expansion valve 16 after being pressurized by the outdoor refrigerant pump 15, the refrigerant enters the liquid collecting and gas distributing device 31 in the liquid collecting and gas distributing liquid supply module 300 almost without throttling and pressure reduction, the low-temperature and low-pressure liquid refrigerant enters the indoor evaporation module 200 again through the refrigerant pump 32 in the liquid collecting and gas distributing liquid supply module 300, and the low-temperature and low-pressure liquid refrigerant enters the evaporator 21 after the flow is regulated by the indoor expansion valve 22 in the indoor evaporation module 200, so that; the gas refrigerant after evaporation and heat absorption is subjected to gas-liquid separation through the liquid collecting and gas distributing device 31 in the liquid collecting and gas distributing module 300, and the separated gas refrigerant enters the condenser 14 through the first one-way valve 17 of the outdoor condensation module 100 to complete circulation;
when the outdoor has enough natural cold source, namely the outdoor temperature is less than T2, the system operates in a natural cooling mode, namely the outdoor condensing modules all operate in the natural cooling mode; the gas refrigerant after the heat absorption of the self-evaporator is evaporated passes through a liquid collecting and gas distributing device in a liquid collecting and gas distributing module, the compressor does not work at the moment, the gas refrigerant directly enters a condenser through a one-way valve connected with the compressor in parallel, the gas refrigerant is condensed into a liquid refrigerant and enters a liquid storage device under the action of a natural cold source, an outdoor refrigerant pump is opened to operate at the moment, the refrigerant enters an outdoor expansion valve after being pressurized through the outdoor refrigerant pump, the refrigerant enters the liquid collecting and gas distributing device in a liquid collecting and gas distributing liquid supply module almost without throttling and pressure reduction, the low-temperature and low-pressure liquid refrigerant enters an indoor evaporation module again through a refrigerant pump in the liquid collecting and gas distributing liquid supply module, and the low-temperature and low-pressure liquid refrigerant enters the evaporator after the flow is regulated; the gaseous refrigerant after evaporation and heat absorption passes through a liquid collecting and gas distributing device in the liquid collecting and gas distributing module, and the separated gaseous refrigerant enters a condenser of the outdoor condensation module through a first one-way valve to complete circulation.
The first check valve 17 has another function of preventing the refrigerant discharged from the compressor 11 from flowing backward to the suction port of the compressor 11 when the compressor 11 is operated; the second check valve 18 also functions to prevent the refrigerant discharged from the outdoor refrigerant pump 15 from flowing backward to the inlet of the outdoor refrigerant pump 15 when the outdoor refrigerant pump 15 is operated.
The first ball valve 23 and the second ball valve 24 are used for cutting off the connection between the indoor evaporation module 200 and the liquid-liquid separation and supply module 300.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (5)
1. An oil-free efficient refrigeration system for a data center comprises a plurality of outdoor condensation modules, a plurality of indoor evaporation modules and a liquid-collecting gas-distributing liquid-supplying module; it is characterized in that the preparation method is characterized in that,
each outdoor condensing module comprises a compressor, a one-way valve, a condenser, a liquid storage device, an outdoor refrigerant pump and an outdoor expansion valve; the air outlet of the compressor is connected with the one-way valve, the outlet of the one-way valve is connected with the condenser, the outlet of the condenser is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is connected with the inlet of the outdoor refrigerant pump, and the outlet of the outdoor refrigerant pump is connected with the inlet of the outdoor expansion valve; a first one-way valve is connected in parallel between the air suction port of the compressor and the outlet of the one-way valve; a second one-way valve is connected in parallel between the inlet and the outlet of the outdoor refrigerant pump;
each indoor evaporation module comprises an evaporator and an indoor expansion valve; the inlet of the evaporator is connected with the outlet of the indoor expansion valve;
the liquid collecting, gas distributing and liquid supplying module comprises a liquid collecting and gas distributing device and a refrigerant pump, wherein liquid inlets of the liquid collecting and gas distributing device are respectively connected with outlets of outdoor expansion valves of the outdoor condensation modules, gas outlets of the liquid collecting and gas distributing device are respectively connected with air suction ports of compressors of the outdoor condensation modules, gas inlets of the liquid collecting and gas distributing device are respectively connected with outlets of evaporators of the indoor evaporation modules, and liquid outlets of the liquid collecting and gas distributing device are connected with inlets of the refrigerant pump; and outlets of the refrigerant pumps are respectively connected with inlets of the indoor expansion valves of the plurality of indoor evaporation modules.
2. An oil-free high-efficiency refrigeration system for data centers as claimed in claim 1, wherein the compressor in each outdoor condensing module is an oil-free compressor; the condenser adopts an indirect evaporative condenser or an air-cooled condenser.
3. An oil-free high-efficiency refrigeration system for data center as claimed in claim 1, wherein the evaporator in each indoor evaporation module employs a coil heat exchanger and a fan or a micro-channel heat exchanger and a fan, and each indoor evaporation module further comprises a first ball valve installed on a liquid pipe and a second ball valve installed on a gas pipe.
4. An oil-free high-efficiency refrigeration system for a data center as claimed in claim 1, wherein the refrigerant pump in the liquid collecting, gas distributing and liquid supplying module is formed by connecting a plurality of refrigerant pumps in parallel.
5. A control method of an oil-free high-efficiency refrigeration system for a data center, based on the oil-free high-efficiency refrigeration system for the data center as claimed in claim 1, wherein the control method is as follows:
when no natural cold source exists outdoors, namely the outdoor temperature is higher than T1, the system operates in a refrigeration mode, namely a plurality of outdoor condensation modules all operate in the refrigeration mode; the compressor discharges high-temperature and high-pressure gaseous refrigerant, the gaseous refrigerant enters the condenser through the one-way valve, the gaseous refrigerant is condensed into liquid refrigerant and then enters the liquid storage device, the compression ratio of the system is larger than a set value, so that the outdoor refrigerant pump does not run, the refrigerant directly enters the outdoor expansion valve through the second one-way valve which is connected with the outdoor refrigerant pump in parallel to carry out throttling and pressure reduction, the refrigerant enters the liquid collecting and gas distributing device in the liquid collecting and gas distributing liquid supply module, the low-temperature and low-pressure liquid refrigerant output by the liquid collecting and gas distributing device enters the indoor evaporation module again through the refrigerant pump, and the low-temperature and low-pressure liquid refrigerant enters the; the gas refrigerant after evaporation and heat absorption is subjected to gas-liquid separation through the liquid collecting and gas distributing device, and the separated gas refrigerant enters an air suction port of a compressor of the outdoor condensation module to complete circulation;
when a certain natural cold source exists outdoors, namely the outdoor temperature is less than T1 and greater than T2, the system operates in a compressor refrigeration and natural cooling refrigeration mode, namely one part of outdoor condensation modules operates in a natural cooling mode, and the other part of outdoor condensation modules operates in a refrigeration mode; the operation mode of a part of outdoor condensation modules operating in the refrigeration mode is as follows: the compressor discharges high-temperature and high-pressure gaseous refrigerant, the gaseous refrigerant enters the condenser through the one-way valve, the gaseous refrigerant is condensed into liquid refrigerant and then enters the liquid storage device, the compression ratio is smaller than a set value, so that the outdoor refrigerant pump is opened to operate, the refrigerant enters the outdoor expansion valve through the pressurization effect of the outdoor refrigerant pump for throttling and reducing pressure and enters the liquid collecting and gas distributing and gas supplying device in the liquid collecting and gas distributing and liquid supplying module, the low-temperature and low-pressure liquid refrigerant enters the indoor evaporation module again through the refrigerant pump in the liquid collecting and gas distributing and liquid supplying module, and the low-temperature and low-pressure liquid refrigerant enters the evaporator after the flow; the other outdoor condensation module operating in the natural cooling mode operates in the following mode: the gas refrigerant after the heat absorption of the self-evaporator is evaporated passes through a liquid collecting and gas distributing device in a liquid collecting and gas distributing module, the compressor does not work at the moment, the gas refrigerant directly enters a condenser through a first one-way valve connected with the compressor in parallel, the gas refrigerant is condensed into liquid refrigerant under the action of a natural cold source and enters a liquid storage device, an outdoor refrigerant pump runs at the moment, the refrigerant enters an outdoor expansion valve after being pressurized through the outdoor refrigerant pump, the refrigerant enters the liquid collecting and gas distributing and liquid supplying device in the liquid collecting and gas distributing and liquid supplying module without throttling and pressure reduction, the low-temperature low-pressure liquid refrigerant enters an indoor evaporation module again through a refrigerant pump in the liquid collecting and gas distributing and liquid supplying module, the low-temperature low-pressure liquid refrigerant enters the evaporator after the flow; the gas refrigerant after evaporation and heat absorption is subjected to gas-liquid separation through a liquid collecting and gas distributing device in the liquid collecting and gas distributing module, and the separated gas refrigerant enters a condenser of the outdoor condensing module through a first one-way valve to complete circulation;
when the outdoor has enough natural cold source, namely the outdoor temperature is less than T2, the system operates in a natural cooling mode, namely the outdoor condensing modules all operate in the natural cooling mode; the gas refrigerant after the heat absorption of the self-evaporator is evaporated passes through a liquid collecting and gas distributing device in a liquid collecting and gas distributing module, the compressor does not work at the moment, the gas refrigerant directly enters a condenser through a one-way valve connected with the compressor in parallel, the gas refrigerant is condensed into a liquid refrigerant under the action of a natural cold source and enters a liquid storage device, an outdoor refrigerant pump is opened to operate at the moment, the refrigerant enters an outdoor expansion valve after being pressurized through the outdoor refrigerant pump, the refrigerant enters the liquid collecting and gas distributing device in the liquid collecting and gas distributing liquid supply module without throttling and pressure reduction, the low-temperature low-pressure liquid refrigerant enters an indoor evaporation module again through a refrigerant pump in the liquid collecting and gas distributing liquid supply module, the low-temperature low-pressure liquid refrigerant enters the evaporator after the flow; the gaseous refrigerant after evaporation and heat absorption passes through a liquid collecting and gas distributing device in the liquid collecting and gas distributing module, and the separated gaseous refrigerant enters the condenser through a first one-way valve of the outdoor condensation module to complete circulation.
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| CN202010475842.8A CN111565546A (en) | 2020-05-29 | 2020-05-29 | Oil-free efficient refrigeration system for data center and control method thereof |
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| CN202010475842.8A CN111565546A (en) | 2020-05-29 | 2020-05-29 | Oil-free efficient refrigeration system for data center and control method thereof |
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| CN111565546A true CN111565546A (en) | 2020-08-21 |
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| CN202010475842.8A Pending CN111565546A (en) | 2020-05-29 | 2020-05-29 | Oil-free efficient refrigeration system for data center and control method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728803A (en) * | 2020-12-30 | 2021-04-30 | 北京百度网讯科技有限公司 | Cooling system |
| CN112888262A (en) * | 2021-01-29 | 2021-06-01 | 北京百度网讯科技有限公司 | Cooling system |
| CN113518544A (en) * | 2021-06-24 | 2021-10-19 | 苏州浪潮智能科技有限公司 | Air conditioning system with cold accumulation function in data center and refrigeration method |
| CN114599199A (en) * | 2021-12-28 | 2022-06-07 | 北京百度网讯科技有限公司 | Refrigerating system of data center |
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2020
- 2020-05-29 CN CN202010475842.8A patent/CN111565546A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728803A (en) * | 2020-12-30 | 2021-04-30 | 北京百度网讯科技有限公司 | Cooling system |
| CN112888262A (en) * | 2021-01-29 | 2021-06-01 | 北京百度网讯科技有限公司 | Cooling system |
| CN112888262B (en) * | 2021-01-29 | 2023-08-04 | 北京百度网讯科技有限公司 | Cooling system |
| CN113518544A (en) * | 2021-06-24 | 2021-10-19 | 苏州浪潮智能科技有限公司 | Air conditioning system with cold accumulation function in data center and refrigeration method |
| CN114599199A (en) * | 2021-12-28 | 2022-06-07 | 北京百度网讯科技有限公司 | Refrigerating system of data center |
| CN114599199B (en) * | 2021-12-28 | 2023-10-03 | 北京百度网讯科技有限公司 | Refrigeration system of data center |
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