CN114719457B - Energy-saving data center refrigeration composite system and method - Google Patents

Energy-saving data center refrigeration composite system and method Download PDF

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CN114719457B
CN114719457B CN202210265226.9A CN202210265226A CN114719457B CN 114719457 B CN114719457 B CN 114719457B CN 202210265226 A CN202210265226 A CN 202210265226A CN 114719457 B CN114719457 B CN 114719457B
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valve
refrigeration cycle
double
injection
cooling liquid
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CN114719457A (en
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谢公南
祝怀涛
马圆
张迎春
李书磊
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Northwestern Polytechnical University
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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
    • F25B1/06—Compression machines, plants or systems with non-reversible cycle with compressor of jet type, e.g. using liquid under pressure
    • F25B1/08—Compression machines, plants or systems with non-reversible cycle with compressor of jet type, e.g. using liquid under pressure using vapour under pressure
    • 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
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
    • F25B27/005—Machines, plants or systems, using particular sources of energy using solar energy in compression type systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/05—Cost reduction
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/09—Improving heat transfers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

The invention discloses a refrigeration composite system and a method for an energy-saving data center, wherein the refrigeration composite system comprises a double-injection refrigeration cycle powered by solar energy, a vapor compression refrigeration cycle powered by electricity and an automatic manual switching system. The invention adopts a double-injection type and vapor compression type refrigeration composite system, can avoid the electricity consumption of most of the flat and high-period high-capacity cooling systems, and uses the low-cost electric quantity of the low-valley period to operate the vapor compression type refrigeration cycle to drive the refrigeration system to work when no solar energy exists. The system supports automatic and manual switching and combined operation of the double-injection refrigeration cycle and the vapor compression refrigeration cycle, can automatically switch the double-injection refrigeration cycle and the vapor compression refrigeration cycle when solar energy disappears, and can automatically start the vapor compression refrigeration cycle when the cooling capacity of the double-injection refrigeration cycle powered by single solar energy is insufficient under the condition of high load, and the double-injection refrigeration cycle and the combined operation are used for cooling a server.

Description

Energy-saving data center refrigeration composite system and method
Technical Field
The invention belongs to the technical field of refrigeration, and particularly relates to a data center refrigeration composite system and a data center refrigeration composite method.
Background
With the rapid development of computer cloud computing, intelligent manufacturing and big data technology in recent years, a data center becomes one of the essential infrastructures for promoting social progress. At present, the data center is developing toward centralization and large-scale, and the reduction of energy consumption and the saving of cost become one of the problems to be solved in the rising of the data center.
With the continuous increase of the scale of data centers, the global energy consumption brought by the data centers is rapidly increased, and the problem of high energy consumption is highly valued in the industry. At present, the power consumption of 300 ten thousand data centers running worldwide accounts for 1.1% -1.5% of the total power consumption worldwide.
The energy consumption of the air conditioning refrigeration system of the data center is large in proportion, the energy consumption of the cooling system is 44% of the total energy consumption of a machine room of the data center, and the energy consumption of the data center is a key for reducing. Before the day, the number of racks of the data center in China is increased from 124.4 ten thousand in 2016 to 315 ten thousand in 2019, and 154% in three years, wherein the ratio of the ultra-large data center is increased from 11.3% to 37.4%. The data center power consumption in year 2030 is expected to be 5.1 times that in year 2020.
The Chinese engineering courtyard, the Chinese engineering courtyard primary and secondary courtyard Hequan speaks in the China's first digital carbon neutral and peak forum, and the implementation of the green low-carbon operation mode of the data center needs to be: the photovoltaic is overlapped, the comprehensive energy supply, the efficient refrigeration, the waste heat recycling and the like are realized.
At present, most data centers still adopt an air-conditioner air cooling or water-cooled liquid cooling scheme to cool a server, the air-conditioner air cooling has the advantages of high power consumption and limited cooling effect, the water-cooled liquid cooling solution has the advantages of complex structure and high manufacturing cost, and the leakage problem of a plurality of pipeline interfaces is one of the key hidden hazards affecting the long-term operation reliability of the system. The two-phase immersion cooling system, in which the server system components do not need to be additionally sealed, can directly operate in a liquid environment, can uniformly temperature all parts through natural convection of liquid, and can reduce the temperature of the system components through great latent heat of liquid phase change, is one of the most advantageous cooling systems in the current server cooling system.
There are many alternative cycles of immersion refrigeration systems, such as lithium bromide absorption refrigeration, compression refrigeration, and traditional single-stage injection refrigeration, and although these systems have been widely used in daily life, they all have certain drawbacks and disadvantages.
The vapor compression refrigeration cycle is the most classical refrigeration cycle and is the most developed and widely used refrigeration cycle at present, but the vapor compression refrigeration cycle must use electric power to power a pump in the refrigeration cycle.
The traditional single-injection refrigerating system has the defects of compact structure, small occupied space, capability of utilizing solar energy or waste heat of a factory and other low-temperature heat sources, low refrigerating coefficient and poor economical efficiency, and still needs electric power to supply energy to a pump in the circulation, thereby limiting the further popularization and development of the single-injection refrigerating system.
Patent CN101818965a proposes a new type of double-injection refrigeration system, which, while inheriting the advantages of a single-injection refrigeration system, uses a vapor-liquid ejector instead of a mechanical pump in the cycle, and at the same time solves the problems of low efficiency of the injection refrigeration system and the need of electricity to power the pump. The system utilizes the high-temperature and high-pressure working medium from the generator to jet the liquid in the condenser through the gas-liquid injector, thereby replacing a mechanical pump, being a passive system without any electric energy, having no other energy input except solar energy, realizing zero external power loss, having no moving parts and having no noise pollution.
The electric energy cannot be stored in a large scale, production and consumption need to be balanced in real time, the consumed electric power resources in different electricity consumption periods are different, and the power supply cost is quite different. The time-of-use electricity price mechanism is designed based on the electric energy time value, and is an important mechanism arrangement for guiding the power users to cut peaks and fill valleys and guaranteeing the safe, stable and economic operation of the power system, for example, the annual peaks and valleys of the Henan power grid are divided into peaks, flat sections and valleys for 8 hours each according to 24 hours per day, wherein the peaks are 10 to 14 hours and 17 to 21 hours, the valleys are 23 to 7 hours the next day, and the rest are flat sections.
The data center belongs to continuous operation equipment, needs to operate at any time and needs a cooling system to continuously operate, taking a Henan power grid as an example, the data center operates at peak time intervals between 10 and 14 and between 17 and 21, and the peak valley electricity price difference is about 3 times, and the flat valley electricity price difference is about 2 times, so that the cooling system of the server data center using the double-injection refrigerating system can avoid most of flat and high time intervals, the low-price electric quantity in the low valley time interval is used for operating the vapor compression refrigerating cycle to cool the server, and the solar double-injection refrigerating cycle is used for cooling the server in the flat and high time intervals in the daytime.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a refrigeration composite system and a method for an energy-saving data center, wherein the refrigeration composite system comprises a double-injection refrigeration cycle powered by solar energy, a vapor compression refrigeration cycle powered by electricity and an automatic manual switching system. The invention adopts a double-injection type and vapor compression type refrigeration composite system, can avoid the electricity consumption of most of the flat and high-period high-capacity cooling systems, and uses the low-cost electric quantity of the low-valley period to operate the vapor compression type refrigeration cycle to drive the refrigeration system to work when no solar energy exists. The system supports automatic and manual switching and combined operation of the double-injection refrigeration cycle and the vapor compression refrigeration cycle, can automatically switch the double-injection refrigeration cycle and the vapor compression refrigeration cycle when solar energy disappears, and can automatically start the vapor compression refrigeration cycle when the cooling capacity of the double-injection refrigeration cycle powered by single solar energy is insufficient under the condition of high load, and the double-injection refrigeration cycle and the combined operation are used for cooling a server.
The technical scheme adopted by the invention for solving the technical problems comprises the following steps:
an energy-saving data center refrigerating composite system comprises a double-injection refrigerating circulating system, a vapor compression refrigerating circulating system and an automatic manual switching system;
the double-injection refrigeration cycle system comprises a generator, a gas storage bottle, a gas-gas injector, a condenser, a thermal expansion valve, a gas-liquid injector, a refrigerant bottle, a first liquid storage tank, a second liquid storage tank and a cooling liquid cabinet; the vapor compression refrigeration cycle system comprises a compressor, a condenser, a liquid storage tank II, a refrigerant bottle, a thermal expansion valve and a cooling liquid cabinet; wherein the condenser, the second liquid storage tank, the refrigerant bottle, the thermal expansion valve and the cooling liquid cabinet are shared by a double-injection refrigeration cycle system and a vapor compression refrigeration cycle system; the automatic manual switching system comprises a processor, a temperature sensor, a pressure sensor and valves one to eleven;
the temperature sensor is placed in the cooling liquid cabinet and connected with the processor, and is used for measuring the temperature of the cooling liquid in the cooling liquid cabinet;
the pressure sensor is arranged in the gas storage bottle and connected with the processor and is used for measuring the pressure of steam in the gas storage bottle;
in the double-jet refrigeration cycle system, the cooling liquid is heated in the generator by solar radiation to generate high-temperature high-pressure steam, and the steam enters the gas storage bottle for temporary storage; the high-temperature and high-pressure steam in the gas storage bottle is divided into two flows after passing through the valve I, one flow flows to the gas-liquid injector through the flow valve II, and the other flow flows to the gas-gas injector; the high-temperature and high-pressure steam entering the gas-gas injector is injected to low-temperature and low-pressure steam from the cooling liquid cabinet, the low-temperature and low-pressure steam is pressurized and mixed, flows into the condenser through the valve IV, and is condensed and cooled to form low-temperature and high-pressure cooling liquid;
the liquid in the condenser is divided into two paths, wherein one path enters the injection end of the gas-liquid injector through the valve eight and is injected and pressurized to be higher than the pressure in the generator by high-temperature and high-pressure steam from the generator, so that condensate in the condenser is temporarily stored through the flow liquid storage tank I after passing through the valve eleven and is conveyed back to the generator; the other path is temporarily stored through a second flowing liquid storage tank, and when the other path is needed, the refrigerant bottle is subjected to liquid supplementing through a valve nine, and then is throttled and depressurized into low-temperature low-pressure cooling liquid through a valve ten by a thermal expansion valve, and then is conveyed to a cooling liquid cabinet for evaporation and refrigeration; the low-temperature low-pressure steam generated in the cooling liquid cabinet completely enters the gas-gas sprayer after passing through the valve seven and the valve three;
in the vapor compression refrigeration cycle system, a compressor is started, and low-temperature low-pressure vapor in a cooling liquid cabinet completely enters the compressor through a valve seven and a valve six and is pressurized by the compressor and then is conveyed to a condenser through a valve five; cooling liquid which is cooled to low temperature and high pressure after passing through a condenser is temporarily stored through a liquid storage tank II, and is throttled and depressurized into low temperature and low pressure cooling liquid through a thermostatic expansion valve through a valve II after being replenished by a refrigerant bottle when needed, and then is conveyed to a cooling liquid cabinet for evaporation and refrigeration;
when the refrigeration composite system operates in a combined operation mode of the double-injection refrigeration cycle and the vapor compression refrigeration cycle, the double-injection refrigeration cycle system and the vapor compression refrigeration cycle system operate simultaneously, the flow rate of the cooling liquid cabinet is increased through the flow condenser, the liquid storage tank II, the thermal expansion valve and the cooling liquid cabinet, and the refrigeration composite system supplements liquid through the cooling liquid bottle to maintain the liquid level in the cooling liquid cabinet unchanged; at the moment, the steam evaporated in the cooling liquid cabinet does not completely enter the gas-gas injector or the compressor, but is split into two paths, one path enters the double-injection refrigeration cycle through the gas-gas injector, and the other path enters the condenser after being pressurized by the flow compressor;
the processor can automatically control the opening and closing of the valve I-valve eleven and the opening and closing of the compressor according to the temperature of the cooling liquid in the cooling liquid cabinet and the steam pressure in the gas storage bottle; when the valve five, the valve six and the compressor are closed, and the valve one, the valve two, the valve three, the valve four, the valve seven, the valve eight, the valve nine, the valve ten and the valve eleven are opened, the refrigeration composite system enters a double-injection refrigeration cycle mode; when the valve I, the valve II, the valve III, the valve IV, the valve eight and the valve eleven are closed, and the valve five, the valve six, the valve seven, the valve nine, the valve ten and the compressor are opened, the refrigeration composite system enters a vapor compression refrigeration cycle mode; when the valve I-valve eleven and the compressor are opened, the refrigeration composite system enters a combined operation mode of a double-injection refrigeration cycle powered by solar energy and a vapor compression refrigeration cycle powered by electricity;
the valve I-valve eleven and the compressor can also realize the switching of the double-injection refrigeration cycle mode, the vapor compression refrigeration cycle mode, the double-injection refrigeration cycle and the vapor compression refrigeration cycle combined operation mode through manual control.
Preferably, the cooling liquid cabinet adopts two-phase immersion cooling, electronic components are directly immersed into sealed cooling liquid, and heat generated by the electronic components enables the liquid to boil and absorbs a large amount of latent heat of vaporization.
Preferably, the cooling liquid is a fluorinated liquid capable of directly contacting the electronic device.
An energy-saving data center refrigerating method comprises the following steps:
step 1: setting upHigh temperature threshold T 1 And a low temperature threshold T 2 Wherein T is 1 Below the maximum allowable temperature to meet the cooling requirement of the system, T 2 Below T 1 The method comprises the steps of carrying out a first treatment on the surface of the Setting a high pressure threshold P 1 And a low pressure threshold P 2 ，P 2 Set to the lowest pressure for operating the dual injection refrigeration cycle system, P 2 Below P 1 ；
Step 2: setting the temperature of the cooling liquid in the cooling liquid cabinet measured by the temperature sensor as T; setting the pressure sensor to measure the steam pressure in the gas storage bottle as P;
step 3: the refrigerating rule of the refrigerating composite system is set as follows:
state 1: when T is greater than or equal to T 1 ，P≥P 1 When the combined refrigerating system adopts a combined operation mode of double-injection refrigerating cycle powered by solar energy and vapor compression refrigerating cycle powered by electricity;
state 2: when T is<T 1 ，P≥P 1 When the refrigerating composite system is operated independently in a double-injection refrigerating cycle mode powered by solar energy;
state 3: when P is less than or equal to P 2 When the refrigerating composite system is operated independently by adopting a vapor compression type refrigerating cycle mode powered by electricity;
state 4: when T is greater than or equal to T 1 ，P 1 >P>P 2 When the combined refrigerating system adopts a combined operation mode of double-injection refrigerating cycle powered by solar energy and vapor compression refrigerating cycle powered by electricity;
state 5: when T is less than or equal to T 2 ，P 1 >P>P 2 When the refrigerating composite system is operated independently in a double-injection refrigerating cycle mode powered by solar energy;
state 6: when T is 1 >T>T 2 ，P 1 >P>P 2 When in use; if the state 6 is the initial state, the refrigeration composite system independently operates in a double-injection refrigeration cycle mode powered by solar energy; if state 6 is shifted from one of states 1-5, the refrigeration cycle mode for the last state is maintained.
The beneficial effects of the invention are as follows:
compared with the prior art, the system has the following advantages:
1. compared with the traditional refrigeration cycle, the double-jet refrigeration cycle powered by solar energy is a passive system without any electric energy, and has no other energy input except solar energy, thereby realizing zero external power loss, no moving parts and no noise pollution.
2. The system can utilize low-cost low-valley electricity quantity, high electricity consumption required by a cooling system is saved, the cooling system of the server data center using the double-injection refrigerating system can avoid most of flat and high time periods during daytime, the steam compression refrigerating cycle is operated to cool the server by using the low-cost electricity quantity of the low-valley time period during no solar energy, and the double-injection refrigerating cycle of solar energy is adopted to cool the server during the flat and high time periods during daytime.
3. The system adopts two-phase immersion refrigeration, and heat generated by electronic elements can be directly and efficiently transferred into liquid, so that the requirement on heat conduction interface materials, radiators or active cooling components such as fans and the like is reduced, and the heat is taken away by a large amount of vaporization latent heat absorbed during boiling of cooling liquid, so that a more efficient cooling effect is realized.
4. The system supports automatic and manual switching and combined operation of the double-injection refrigeration cycle and the vapor compression refrigeration cycle, can automatically switch the double-injection refrigeration cycle and the vapor compression refrigeration cycle when solar energy disappears, and can automatically start the vapor compression refrigeration cycle when the cooling capacity of the single-solar-powered double-injection refrigeration cycle is insufficient under the condition of high load, and the double-injection refrigeration cycle and the combined operation are used for cooling a server.
Drawings
Fig. 1 is a schematic diagram of the circulation principle when a server is cooled by a single solar-powered dual-jet refrigeration cycle.
Fig. 2 is a schematic diagram of the circulation principle when the solar energy-powered double-injection refrigeration cycle and the electric energy-powered vapor compression refrigeration cycle are combined to operate to cool the server.
Fig. 3 is a schematic diagram of the principle of circulation when the electrically powered vapor compression refrigeration cycle alone is used to cool a server.
In the figure, a 1-generator, a 2-gas storage bottle, a 3-gas injector, a 4-condenser, a 5-thermal expansion valve, a 6-gas-liquid injector, a 7-refrigerant bottle, a 8-liquid storage tank I, a 9-liquid storage tank II, a 10-cooling liquid tank, a 11-compressor, a 12-processor, a 13-temperature sensor, a 14-pressure sensor, a 15-valve I, a 16-valve II, a 17-valve III, a 18-valve IV, a 19-valve V, a 20-valve VI, a 21-valve seven, a 22-valve eight, a 23-valve nine, a 24-valve ten and a 25-valve eleven.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The invention provides an energy-saving double-injection type and vapor compression type refrigeration composite system for two-phase immersion type cooling of a server data center by utilizing solar energy and low-valley electric quantity, which aims to solve the problems of high energy consumption and operation cost of the existing data center refrigeration system, the device adopts the two-phase immersion type cooling, the refrigeration system is circularly adopting the double-injection type and vapor compression type refrigeration composite system, and the server can be cooled by adopting the solar energy-powered double-injection refrigeration cycle in the level and high period of the day, so that the electricity consumption of most of the flat and high-period high-capacity cooling system is avoided, the vapor compression type refrigeration cycle is operated by using the low-valley electric quantity when no solar energy exists, the refrigeration system is driven to work, and meanwhile, the system supports the automatic and manual switching and the combined operation of the double-injection type refrigeration cycle and the vapor compression type refrigeration cycle when the solar energy disappears, and simultaneously can solve the problems of insufficient cooling capacity of the single solar energy double-injection type refrigeration cycle under the condition of partial high load and special requirements under other conditions.
An energy-saving data center refrigerating composite system comprises a double-injection refrigerating circulating system, a vapor compression refrigerating circulating system and an automatic manual switching system;
the double-injection refrigeration cycle system comprises a generator, a gas storage bottle, a gas-gas injector, a condenser, a thermal expansion valve, a gas-liquid injector, a refrigerant bottle, a first liquid storage tank, a second liquid storage tank and a cooling liquid cabinet; the vapor compression refrigeration cycle system comprises a compressor, a condenser, a liquid storage tank II, a refrigerant bottle, a thermal expansion valve and a cooling liquid cabinet; wherein the condenser, the second liquid storage tank, the refrigerant bottle, the thermal expansion valve and the cooling liquid cabinet are shared by a double-injection refrigeration cycle system and a vapor compression refrigeration cycle system; the automatic manual switching system comprises a processor, a temperature sensor, a pressure sensor and valves one to eleven;
the temperature sensor is placed in the cooling liquid cabinet and connected with the processor, and is used for measuring the temperature of the cooling liquid in the cooling liquid cabinet;
the pressure sensor is arranged in the gas storage bottle and connected with the processor and is used for measuring the pressure of steam in the gas storage bottle;
in the double-jet refrigeration cycle system, the cooling liquid is heated in the generator by solar radiation to generate high-temperature high-pressure steam, and the steam enters the gas storage bottle for temporary storage; the high-temperature and high-pressure steam in the gas storage bottle is divided into two flows after passing through the valve I, one flow flows to the gas-liquid injector through the flow valve II, and the other flow flows to the gas-gas injector; the high-temperature and high-pressure steam entering the gas-gas injector is injected to low-temperature and low-pressure steam from the cooling liquid cabinet, the low-temperature and low-pressure steam is pressurized and mixed, flows into the condenser through the valve IV, and is condensed and cooled to form low-temperature and high-pressure cooling liquid;
the liquid in the condenser is divided into two paths, wherein one path enters the injection end of the gas-liquid injector through the valve eight and is injected and pressurized to be higher than the pressure in the generator by high-temperature and high-pressure steam from the generator, so that condensate in the condenser is temporarily stored through the flow liquid storage tank I after passing through the valve eleven and is conveyed back to the generator; the other path is temporarily stored through a second flowing liquid storage tank, and when the other path is needed, the refrigerant bottle is subjected to liquid supplementing through a valve nine, and then is throttled and depressurized into low-temperature low-pressure cooling liquid through a valve ten by a thermal expansion valve, and then is conveyed to a cooling liquid cabinet for evaporation and refrigeration; the low-temperature low-pressure steam generated in the cooling liquid cabinet completely enters the gas-gas sprayer after passing through the valve seven and the valve three;
in the vapor compression refrigeration cycle system, a compressor is started, and low-temperature low-pressure vapor in a cooling liquid cabinet completely enters the compressor through a valve seven and a valve six and is pressurized by the compressor and then is conveyed to a condenser through a valve five; cooling liquid which is cooled to low temperature and high pressure after passing through a condenser is temporarily stored through a liquid storage tank II, and is throttled and depressurized into low temperature and low pressure cooling liquid through a thermostatic expansion valve through a valve II after being replenished by a refrigerant bottle when needed, and then is conveyed to a cooling liquid cabinet for evaporation and refrigeration;
when the refrigeration composite system operates in a combined operation mode of the double-injection refrigeration cycle and the vapor compression refrigeration cycle, the double-injection refrigeration cycle system and the vapor compression refrigeration cycle system operate simultaneously, the flow rate of the cooling liquid cabinet is increased through the flow condenser, the liquid storage tank II, the thermal expansion valve and the cooling liquid cabinet, and the refrigeration composite system supplements liquid through the cooling liquid bottle to maintain the liquid level in the cooling liquid cabinet unchanged; at the moment, the steam evaporated in the cooling liquid cabinet does not completely enter the gas-gas injector or the compressor, but is split into two paths, one path enters the double-injection refrigeration cycle through the gas-gas injector, and the other path enters the condenser after being pressurized by the flow compressor;
the processor can automatically control the opening and closing of the valve I-valve eleven and the opening and closing of the compressor according to the temperature of the cooling liquid in the cooling liquid cabinet and the steam pressure in the gas storage bottle; when the valve five, the valve six and the compressor are closed, and the valve one, the valve two, the valve three, the valve four, the valve seven, the valve eight, the valve nine, the valve ten and the valve eleven are opened, the refrigeration composite system enters a double-injection refrigeration cycle mode; when the valve I, the valve II, the valve III, the valve IV, the valve eight and the valve eleven are closed, and the valve five, the valve six, the valve seven, the valve nine, the valve ten and the compressor are opened, the refrigeration composite system enters a vapor compression refrigeration cycle mode; when the valve I-valve eleven and the compressor are opened, the refrigeration composite system enters a combined operation mode of a double-injection refrigeration cycle powered by solar energy and a vapor compression refrigeration cycle powered by electricity;
the valve I-valve eleven and the compressor can also realize the switching of the double-injection refrigeration cycle mode, the vapor compression refrigeration cycle mode, the double-injection refrigeration cycle and the vapor compression refrigeration cycle combined operation mode through manual control.
Preferably, the cooling liquid cabinet adopts two-phase immersion cooling, electronic components are directly immersed into sealed cooling liquid, and heat generated by the electronic components enables the liquid to boil and absorbs a large amount of latent heat of vaporization.
Preferably, the cooling liquid is a fluorinated liquid capable of directly contacting the electronic device.
An energy-saving data center refrigerating method comprises the following steps:
step 1: setting a high temperature threshold T 1 And a low temperature threshold T 2 Wherein T is 1 Below the maximum allowable temperature to meet the cooling requirement of the system, T 2 Below T 1 The method comprises the steps of carrying out a first treatment on the surface of the Setting a high pressure threshold P 1 And a low pressure threshold P 2 ，P 2 Set to the lowest pressure for operating the dual injection refrigeration cycle system, P 2 Below P 1 ；
Step 2: setting the temperature of the cooling liquid in the cooling liquid cabinet measured by the temperature sensor as T; setting the pressure sensor to measure the steam pressure in the gas storage bottle as P;
step 3: the refrigerating rule of the refrigerating composite system is set as follows:
state 1: when T is greater than or equal to T 1 ，P≥P 1 When the combined refrigerating system adopts a combined operation mode of double-injection refrigerating cycle powered by solar energy and vapor compression refrigerating cycle powered by electricity;
state 2: when T is<T 1 ，P≥P 1 When the refrigerating composite system is operated independently in a double-injection refrigerating cycle mode powered by solar energy;
state 3: when P is less than or equal to P 2 When the refrigerating composite system is operated independently by adopting a vapor compression type refrigerating cycle mode powered by electricity;
state 4: when T is greater than or equal to T 1 ，P 1 >P>P 2 When the combined refrigerating system adopts a combined operation mode of double-injection refrigerating cycle powered by solar energy and vapor compression refrigerating cycle powered by electricity;
state 5: when T is less than or equal to T 2 ，P 1 >P>P 2 When the refrigerating composite system is operated independently in a double-injection refrigerating cycle mode powered by solar energy;
state 6: when T is 1 >T>T 2 ，P 1 >P>P 2 When in use; if the state 6 is the initial state, the refrigeration composite system independently operates in a double-injection refrigeration cycle mode powered by solar energy; if state 6 is shifted from one of states 1-5, the refrigeration cycle mode for the last state is maintained.
Specific examples:
the embodiment of the invention has the specific thought that: the invention provides a double-injection type and vapor compression type refrigeration composite system for two-phase immersion type cooling of a server data center by utilizing solar energy and low-valley electric quantity, which is characterized in that the device adopts the two-phase immersion type cooling, the refrigeration system adopts the double-injection type and vapor compression type refrigeration composite system, and the server can be cooled by adopting the solar energy-powered double-injection refrigeration cycle in the level and high period of the day, so that the electricity consumption of the high-volume refrigeration system in most of the level and high period is avoided, and the vapor compression refrigeration cycle is operated by using the low-cost electric quantity in the low-valley period to drive the refrigeration system to work when no solar energy exists.
Meanwhile, the system can realize automatic and manual switching and joint operation of the double-injection refrigeration cycle and the vapor compression refrigeration cycle through the processor control valve Guan Qilai, can automatically switch the double-injection refrigeration cycle and the vapor compression refrigeration cycle when solar energy disappears, and can solve the problem of insufficient cooling capacity of the double-injection refrigeration cycle powered by single solar energy under partial high load conditions and special requirements under other conditions.
To prevent frequent start-up and shut-down of the system from damaging equipment (e.g., compressors) or causing instability of the system, the automatic switching system of the present system employs two-position control.
For a temperature sensor, it will coolThe temperature in the liquid cooling cabinet (evaporator) is fed back to the processor, the processor adopts double-position control of the temperature to realize start-stop control of vapor compression refrigeration, and the temperature set value comprises a large value T 1 And a small value T 2 Wherein T is 1 Slightly below the maximum allowable temperature, T, to meet the cooling requirements of the system 2 Slightly lower than T 1 . (1) When the temperature exceeds the set temperature by a large value T 1 When the power provided by the solar energy cannot meet the cooling load of the system, the closing and starting of the valve are controlled by the processor, and the specific closing and starting of the valve is performed in the detailed operation process. (2) When the temperature is reduced from high temperature to T 1 Below, but still greater than a small value T 2 When the system is in use, the power provided by solar energy meets the requirement of system cooling, the vapor compression refrigeration system is not closed, the system is not unstable due to tiny fluctuation of temperature, and meanwhile, the compressor is prevented from being started frequently; (3) When the temperature is reduced to T 2 And when the power provided by the solar energy meets the system cooling requirement, the processor controls the valve to be closed, and the vapor compression refrigeration system is closed.
For the pressure sensor, the pressure in the gas storage bottle is fed back to the processor, the processor adopts double-position control of the pressure to realize start-stop control of double-injection refrigeration, and the pressure set value comprises a large value P 1 And a small value P 2 ，P 2 The minimum working pressure of the double-injection refrigerating system is set according to the actual conditions, P 1 Should be slightly greater than P 2 . (1) When the pressure exceeds the set pressure by a large value P 1 At this point, it is believed that the solar energy may provide a relatively stable cooling power, at which point the closing of the valves by the processor is controlled to initiate the dual injection refrigeration system, and the closing of the particular valves is described in detail below. (2) When the pressure is reduced to P 1 Above, but still greater than, a small value P 2 At the moment, the solar energy can still provide relatively stable refrigerating power, the double-injection refrigerating system is guaranteed to be started, the system is guaranteed not to be unstable due to short-time shielding of cloud layers or tiny fluctuation caused by other reasons, and meanwhile frequent start and stop are avoided; (3) When the pressure is reduced to P 2 When the solar energy can not provide relatively stable refrigerating power, the processor controls the valve to be closed and the double-injection refrigerating system to be closed.
When the solar energy is more sufficient in daytime, the system load is smaller than the power provided by the solar energy, and the temperature of the cooling liquid cabinet (evaporator) is smaller than T 1 The pressure in the cylinder being greater than P 2 The system uses a solar powered dual spray refrigeration cycle to cool the servers separately as shown in fig. 1. At the moment, the processor controls the valve five and the valve six to be in a closed state, and monitors the temperature of the cooling liquid in the cooling liquid cabinet through the temperature sensor. At this time, the cooling liquid is heated in the generator by solar radiation to generate high-temperature high-pressure steam which enters the gas storage bottle for temporary storage; the high-temperature and high-pressure steam in the gas storage bottle is divided into two streams, one stream flows to the gas-liquid injector through the second flow valve, and the other stream flows to the gas-gas injector; the high-temperature and high-pressure steam entering the gas-gas injector is used for injecting low-pressure steam from the cooling liquid cabinet, pressurizing and mixing the low-pressure steam with the low-pressure steam, and then flowing into the condenser to be condensed and cooled to form low-temperature and high-pressure cooling liquid; the liquid in the condenser is divided into two paths, wherein one path of liquid enters the injection end of the gas-liquid injector and is injected and pressurized by high-temperature and high-pressure steam from the generator to be higher than the pressure in the generator, so that condensate in the condenser is temporarily stored through the first fluid storage tank and is conveyed back to the generator; the other path is temporarily stored through a second fluid storage tank, throttled and depressurized into low-temperature and low-pressure cooling liquid through a thermal expansion valve, and then conveyed to a cooling liquid cabinet (evaporator) for evaporation and refrigeration.
When solar energy is more sufficient in daytime, but the system load is increased to exceed the power provided by the solar energy, the pressure in the gas storage bottle is still higher than P 2 The temperature of the cooling liquid cabinet (evaporator) increases to be greater than T 1 The processor controls the valve five and the valve six to open, the vapor compression refrigeration system is started, the compressor starts to operate, and the system enters a combined operation stage for cooling the server by the combined operation of the solar energy powered double-injection refrigeration cycle and the electric powered vapor compression refrigeration cycle, as shown in figure 2. At the moment, the double-injection refrigeration cycle is basically unchanged, and the inside of the system is cooled by flowThe flow of the condenser, the second liquid storage tank, the thermal expansion valve and the cooling liquid cabinet (evaporator) is increased, and the system supplements liquid through the refrigerant bottle to maintain the liquid level in the cooling liquid cabinet basically unchanged. At this time, the vapor evaporated in the cooling liquid cabinet is not completely fed into the gas-gas ejector, but is split into two paths, one path is fed into the double-injection refrigeration cycle through the gas-gas ejector, and the other path is fed into the condenser after being pressurized by the flow compressor, which is the vapor compression refrigeration cycle.
In the evening or other reasons such as insufficient solar energy due to cloudy days, the system automatically switches by the processor to operate alone to cool the server using an electrically powered vapor compression refrigeration cycle, as shown in fig. 3. If the previous operation stage is to independently operate by adopting a double-injection refrigeration cycle powered by solar energy, the pressure of the gas storage bottle is reduced to P along with the decrease of the solar energy 2 And the processor controls the double-injection refrigerating system to be closed, the control valve five and the control valve six are opened, the valve one, the valve two, the valve three, the valve four, the valve eight and the valve eleven are closed, the compressor is started, and the internal page of the cooling liquid cabinet is maintained unchanged basically through the liquid supplementing or liquid returning of the cooling liquid bottle. If the previous operation stage is the combined operation of the double-injection refrigeration cycle powered by solar energy and the vapor compression refrigeration cycle powered by electricity for cooling the server, the corresponding working condition is that the solar energy is insufficient to meet the system requirement in the daytime, and the pressure of the gas storage bottle is reduced to P along with the reduction of the solar energy 2 And the processor controls the double-injection refrigerating system to be closed, the valve five and the valve six are opened, the compressor is continuously in an operating state, the valve one, the valve two, the valve three, the valve four, the valve eight and the valve eleven are controlled to be closed, and the page in the cooling liquid cabinet is maintained unchanged basically through the liquid supplementing or liquid returning of the cooling liquid bottle. At the moment, the steam in the cooling liquid cabinet completely enters the compressor, is pressurized by the compressor and then is conveyed to the condenser; after passing through the condenser, the liquid is temporarily stored through a second flowing liquid storage tank, throttled and depressurized into low-temperature and low-pressure cooling liquid through a thermal expansion valve, and then the low-temperature and low-pressure cooling liquid is conveyed to a cooling liquid cabinet (evaporator) for evaporation and refrigeration.
When solar energy can jointly power the system or can singly power the system, the system is switched back to be powered by the solar energyThe dual-jet refrigeration cycle can be independently operated to cool the server, and the operation state is shown in fig. 1, and corresponds to two states. First, for entering the morning stage, or for reasons such as clouding, the solar energy begins to meet the working demand, i.e. the pressure of the gas cylinder rises back to P 1 And when the system is used for cooling the server by adopting the single operation of the double-injection refrigeration cycle powered by solar energy, the switching process is divided into a fifth control valve and a sixth control valve, the compressor is closed, the first control valve, the second control valve, the third control valve, the fourth control valve, the eighth control valve and the eleventh control valve are opened, and the page in the cooling liquid cabinet is basically unchanged by supplementing or returning liquid to the refrigerant bottle. The second is that the original solar energy in the daytime is insufficient in power to use combined refrigeration, and when the solar energy can be used for independently supplying energy to the system due to the reduction of the load of the system, namely the temperature of a cooling liquid cabinet (evaporator) is reduced to T 2 And when the server is in the next stage, namely the previous stage is a combined operation stage for cooling the server by adopting combined operation of a solar energy-powered double-injection refrigeration cycle and an electric energy-powered vapor compression refrigeration cycle, the processor controls the double-injection refrigeration system to be started, the vapor compression refrigeration system to be closed, the switching process is divided into a fifth control valve and a sixth control valve to be closed, the compressor is closed, and the internal page of the cooling liquid cabinet is basically unchanged by liquid supplementing or liquid returning of the cooling liquid bottle.

Claims (4)

1. The energy-saving data center refrigerating composite system is characterized by comprising a double-injection refrigerating circulating system, a vapor compression refrigerating circulating system and an automatic manual switching system;
the double-injection refrigeration cycle system comprises a generator, a gas storage bottle, a gas-gas injector, a condenser, a thermal expansion valve, a gas-liquid injector, a refrigerant bottle, a first liquid storage tank, a second liquid storage tank and a cooling liquid cabinet; the vapor compression refrigeration cycle system comprises a compressor, a condenser, a liquid storage tank II, a refrigerant bottle, a thermal expansion valve and a cooling liquid cabinet; wherein the condenser, the second liquid storage tank, the refrigerant bottle, the thermal expansion valve and the cooling liquid cabinet are shared by a double-injection refrigeration cycle system and a vapor compression refrigeration cycle system; the automatic manual switching system comprises a processor, a temperature sensor, a pressure sensor and valves one to eleven;
the temperature sensor is placed in the cooling liquid cabinet and connected with the processor, and is used for measuring the temperature of the cooling liquid in the cooling liquid cabinet;
the pressure sensor is arranged in the gas storage bottle and connected with the processor and is used for measuring the pressure of steam in the gas storage bottle;
in the double-jet refrigeration cycle system, the cooling liquid is heated in the generator by solar radiation to generate high-temperature high-pressure steam, and the steam enters the gas storage bottle for temporary storage; the high-temperature and high-pressure steam in the gas storage bottle is divided into two flows after passing through the valve I, one flow flows to the gas-liquid injector through the flow valve II, and the other flow flows to the gas-gas injector; the high-temperature and high-pressure steam entering the gas-gas injector is injected to low-temperature and low-pressure steam from the cooling liquid cabinet, the low-temperature and low-pressure steam is pressurized and mixed, flows into the condenser through the valve IV, and is condensed and cooled to form low-temperature and high-pressure cooling liquid;
the liquid in the condenser is divided into two paths, wherein one path enters the injection end of the gas-liquid injector through the valve eight and is injected and pressurized to be higher than the pressure in the generator by high-temperature and high-pressure steam from the generator, so that condensate in the condenser is temporarily stored through the flow liquid storage tank I after passing through the valve eleven and is conveyed back to the generator; the other path is temporarily stored through a second flowing liquid storage tank, and when the other path is needed, the refrigerant bottle is subjected to liquid supplementing through a valve nine, and then is throttled and depressurized into low-temperature low-pressure cooling liquid through a valve ten by a thermal expansion valve, and then is conveyed to a cooling liquid cabinet for evaporation and refrigeration; the low-temperature low-pressure steam generated in the cooling liquid cabinet completely enters the gas-gas sprayer after passing through the valve seven and the valve three;
in the vapor compression refrigeration cycle system, a compressor is started, and low-temperature low-pressure vapor in a cooling liquid cabinet completely enters the compressor through a valve seven and a valve six and is pressurized by the compressor and then is conveyed to a condenser through a valve five; cooling liquid which is cooled to low temperature and high pressure after passing through a condenser is temporarily stored through a liquid storage tank II, and is throttled and depressurized into low temperature and low pressure cooling liquid through a thermostatic expansion valve through a valve II after being replenished by a refrigerant bottle when needed, and then is conveyed to a cooling liquid cabinet for evaporation and refrigeration;
when the refrigeration composite system operates in a combined operation mode of the double-injection refrigeration cycle and the vapor compression refrigeration cycle, the double-injection refrigeration cycle system and the vapor compression refrigeration cycle system operate simultaneously, the flow rate of the cooling liquid cabinet is increased through the flow condenser, the liquid storage tank II, the thermal expansion valve and the cooling liquid cabinet, and the refrigeration composite system supplements liquid through the cooling liquid bottle to maintain the liquid level in the cooling liquid cabinet unchanged; at the moment, the steam evaporated in the cooling liquid cabinet does not completely enter the gas-gas injector or the compressor, but is split into two paths, one path enters the double-injection refrigeration cycle through the gas-gas injector, and the other path enters the condenser after being pressurized by the flow compressor;
the processor can automatically control the opening and closing of the valve I-valve eleven and the opening and closing of the compressor according to the temperature of the cooling liquid in the cooling liquid cabinet and the steam pressure in the gas storage bottle; when the valve five, the valve six and the compressor are closed, and the valve one, the valve two, the valve three, the valve four, the valve seven, the valve eight, the valve nine, the valve ten and the valve eleven are opened, the refrigeration composite system enters a double-injection refrigeration cycle mode; when the valve I, the valve II, the valve III, the valve IV, the valve eight and the valve eleven are closed, and the valve five, the valve six, the valve seven, the valve nine, the valve ten and the compressor are opened, the refrigeration composite system enters a vapor compression refrigeration cycle mode; when the valve I-valve eleven and the compressor are opened, the refrigeration composite system enters a combined operation mode of a double-injection refrigeration cycle powered by solar energy and a vapor compression refrigeration cycle powered by electricity;
the valve I-valve eleven and the compressor can also realize the switching of the double-injection refrigeration cycle mode, the vapor compression refrigeration cycle mode, the double-injection refrigeration cycle and the vapor compression refrigeration cycle combined operation mode through manual control.
2. The energy efficient data center refrigeration complex of claim 1 wherein the cooling fluid cabinet employs two-phase immersion cooling to directly immerse the electronic components in the sealed cooling fluid, the heat generated by the electronic components causing the fluid to boil and absorb a substantial amount of latent heat of vaporization.
3. The energy efficient data center refrigerant complex of claim 1, wherein the cooling fluid is a fluorinated fluid capable of directly contacting the electronic device.
4. A refrigeration method using the refrigeration complex of claim 1, comprising the steps of:
step 1: setting a high temperature threshold T 1 And a low temperature threshold T 2 Wherein T is 1 Below the maximum allowable temperature to meet the cooling requirement of the system, T 2 Below T 1 The method comprises the steps of carrying out a first treatment on the surface of the Setting a high pressure threshold P 1 And a low pressure threshold P 2 ，P 2 Set to the lowest pressure for operating the dual injection refrigeration cycle system, P 2 Below P 1 ；
Step 2: setting the temperature of the cooling liquid in the cooling liquid cabinet measured by the temperature sensor as T; setting the pressure sensor to measure the steam pressure in the gas storage bottle as P;
step 3: the refrigerating rule of the refrigerating composite system is set as follows:
state 1: when T is greater than or equal to T 1 ，P≥P 1 When the combined refrigerating system adopts a combined operation mode of double-injection refrigerating cycle powered by solar energy and vapor compression refrigerating cycle powered by electricity;
state 2: when T is<T 1 ，P≥P 1 When the refrigerating composite system is operated independently in a double-injection refrigerating cycle mode powered by solar energy;
state 3: when P is less than or equal to P 2 When the refrigerating composite system is operated independently by adopting a vapor compression type refrigerating cycle mode powered by electricity;
state 4: when T is greater than or equal to T 1 ，P 1 >P>P 2 When the combined refrigerating system adopts a combined operation mode of double-injection refrigerating cycle powered by solar energy and vapor compression refrigerating cycle powered by electricity;
state 5: when T is less than or equal to T 2 ，P 1 >P>P 2 When the refrigerating composite system is operated independently in a double-injection refrigerating cycle mode powered by solar energy;
state 6: when T is 1 >T>T 2 ，P 1 >P>P 2 When in use; if the state 6 is the initial state, the refrigeration composite system independently operates in a double-injection refrigeration cycle mode powered by solar energy; if state 6 is shifted from one of states 1-5, the refrigeration cycle mode for the last state is maintained.
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