CN117109200A - A solar refrigeration system with cold storage function and its control method - Google Patents
A solar refrigeration system with cold storage function and its control method Download PDFInfo
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- CN117109200A CN117109200A CN202310257551.5A CN202310257551A CN117109200A CN 117109200 A CN117109200 A CN 117109200A CN 202310257551 A CN202310257551 A CN 202310257551A CN 117109200 A CN117109200 A CN 117109200A
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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
- 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
- F25B27/007—Machines, plants or systems, using particular sources of energy using solar energy in sorption type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
- F25B49/043—Operating continuously
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Abstract
The invention discloses a solar refrigerating system with a cold accumulation function, which comprises a solar absorption refrigerating device, a vapor compression refrigerating device, a cold accumulation device and a controller, wherein the solar absorption refrigerating device comprises a solar heat collector and an absorption refrigerating system, the absorption refrigerating system comprises a generator, a first condenser, a first throttle valve, a first evaporator and an absorber, and vapor or hot water generated by the solar heat collector is used as a heat source of the absorption refrigerating system. The solar refrigerating system with the cold accumulation function and the control method thereof solve the problem of energy waste caused by closing the absorption refrigerating system or simultaneously opening the absorption refrigerating system and refrigerating in other modes in the prior art, can maximally utilize solar resources, and fully utilize the advantages of the absorption refrigerating system.
Description
Technical Field
The invention relates to the technical field of solar refrigeration, in particular to a solar refrigeration system with a cold accumulation function and a control method thereof.
Background
Solar energy is used as renewable energy, the application of the renewable energy is more and more extensive, a system for refrigerating by utilizing the solar energy is available at present, however, the solar energy has uncertainty and is closely related to weather change, and when the solar energy resource is insufficient, how to meet the cold energy requirement of a user becomes a difficult problem to be solved urgently.
The solar energy refrigerating system mainly comprises a solar energy absorption refrigerating system, a solar energy absorption refrigerating system and a solar energy injection refrigerating system, wherein,
the working principle of the absorption refrigeration system is as follows: the refrigerant liquid absorbs heat and evaporates in the evaporator, the vapor formed is absorbed by the absorbent, after which the absorbent, which absorbs the refrigerant vapor, is pumped by the solution to the generator where it is heated, separating the refrigerant vapor, which is condensed into a liquid in the condenser, and then throttled before entering the evaporator.
However, in the existing absorption refrigeration system, when the heat source of the generator is insufficient and the cold energy provided by the absorption refrigeration system cannot meet the requirement, the absorption refrigeration system is usually turned off directly and other modes are adopted for refrigeration, the slightly insufficient heat source is not utilized any more, so that energy waste is caused, or the absorption refrigeration system and other refrigeration devices are turned on at the same time, however, various refrigeration devices are turned on at the same time, the operation and maintenance cost is high, and resources are wasted.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a solar refrigeration system with a cold accumulation function and a control method thereof, and aims to solve the problems.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a solar refrigeration system with cold storage function, comprising: the solar absorption refrigeration device comprises a solar heat collector and an absorption refrigeration system, wherein the absorption refrigeration system comprises a generator, a first condenser, a first throttle valve, a first evaporator and an absorber, and steam or hot water generated by the solar heat collector is used as a heat source of the absorption refrigeration system; further comprises:
the vapor compression type refrigerating device comprises a compressor, a second condenser, a second throttle valve and a second evaporator;
the cold accumulation device is internally provided with a cold accumulation medium;
a controller;
wherein the water outlet pipe of the first evaporator is connected with the cold accumulation water inlet pipe of the cold accumulation device through a first water supply pipe, the water outlet pipe of the first evaporator is also connected with a water supply main pipe through a second water supply pipe, the water supply main pipe is used for conveying chilled water to a user, the water inlet pipe of the first evaporator is connected with the cold accumulation water return pipe of the cold accumulation device through a first water return pipe, the water inlet pipe of the first evaporator is connected with a water return main pipe through a second water return pipe, the water return main pipe is used for conveying water on the user side,
the water outlet pipe of the second evaporator is connected with the water supply main pipe through a third water supply pipe, and the water inlet pipe of the second evaporator is connected with the water return main pipe through a third water return pipe;
the cold accumulation device is connected with the water supply main pipe through a fourth water supply pipe, and is connected with the water return main pipe through a fourth water return pipe;
the hot water supply end of the solar heat collector is connected with the heat source inlet end of the generator through a heat source water supply pipe, the heat source outlet end of the generator is connected with the hot water return end of the solar heat collector through a heat source water return pipe, a first temperature sensor is arranged on the heat source water supply pipe, a second temperature sensor is arranged on the heat source water return pipe, and the first temperature sensor and the second temperature sensor are both connected with the controller;
the first water supply pipe, the second water supply pipe, the third water supply pipe, the fourth water supply pipe, the first water return pipe, the second water return pipe, the third water return pipe and the fourth water return pipe are all provided with flow regulating valves connected with the controller;
the heat exchange area of the first evaporator can be adjusted, and the controller adjusts the heat exchange area of the second evaporator according to the difference delta T between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor.
Preferably, the cold accumulation medium adopts water or inorganic salt water solution.
Preferably, the first evaporator comprises a first heat exchanger and a second heat exchanger, wherein the heat exchange area of the first heat exchanger is a first heat exchange area F1, and the heat exchange area of the second heat exchanger is a second heat exchange area F2.
Preferably, the first heat exchanger and the second heat exchanger are arranged in parallel or in series.
The control method of the solar refrigeration system with the cold accumulation function is characterized in that the first evaporator comprises a first heat exchange area F1 and a second heat exchange area F2, F2=beta.F1, wherein 1< beta.ltoreq.2.
Preferably, the controller adjusts the heat exchange area of the second evaporator according to a difference delta T between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor;
wherein, the controller adjusts the heat exchange area of the first evaporator according to the difference delta T between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor, and the method comprises the following steps:
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device and the cold accumulation device are closed to discharge cold, and the controller controls the first evaporator to adjust to the first heat exchange area;
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, and the controller controls the first evaporator to adjust to the second heat exchange area, wherein +.>And is also provided withAnd closing the cold accumulation mode and the cold discharge mode of the cold accumulation device;
wherein Δt=t1-T2; cop is the refrigeration coefficient of the absorption refrigeration system, cop = system refrigeration/system heat supply; m is M 1 Water flow for the heat source water supply pipe; t (T) Feed device The water temperature in the water outlet pipe of the first evaporator; t (T) Returning to The water temperature in the water inlet pipe of the first evaporator; m is M 2 To be at a known T Feed device And T Returning to Under the condition, the refrigerating water flow meeting the cooling capacity requirement of the user.
Preferably, the control method further includes:
if it isAnd Q is Storage device ≥Q User' s Simultaneously closing the solar absorption refrigeration device and the vapor compression refrigeration device, and opening a cold discharging mode of the cold accumulation device, wherein Q is as follows Storage device To the cold accumulation amount of the cold accumulation device, Q User' s The cold energy demand is the user;
if it isAnd Q is Storage device ≤Q User' s The solar absorption refrigeration device and the cold storage device are closed to discharge cold, the vapor compression refrigeration device is opened,
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, the controller controls the first evaporator to adjust to the second heat exchange area, and the cold accumulation mode of the cold accumulation device is started, wherein gamma is more than or equal to 1.6.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
according to the solar refrigerating system with the cold accumulation function and the control method thereof, when the solar energy is slightly insufficient, the cold quantity generated by the absorption refrigerating system cannot meet the requirement, the heat exchange quantity of the evaporator in the absorption refrigerating system is increased at the moment, the absorption refrigerating system can be continuously used for independent refrigeration, solar energy resources are utilized, the energy waste caused by closing the absorption refrigerating system or simultaneously opening the absorption refrigerating system and other modes in the prior art is solved, the solar energy resources can be utilized to the maximum extent, and the advantages of the absorption refrigerating system are fully utilized.
Drawings
Fig. 1 is a schematic view of a solar refrigeration system having a cool storage function according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Hereinafter, a solar refrigeration system having a cool storage function and a control method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a solar refrigeration system with a cool storage function according to an embodiment of the present invention;
the solar refrigeration system with cold accumulation function of the invention comprises: the solar absorption refrigeration device comprises a solar heat collector and an absorption refrigeration system, wherein the absorption refrigeration system comprises a generator, a first condenser, a first throttle valve, a first evaporator 1 and an absorber, and steam or hot water generated by the solar heat collector is used as a heat source of the absorption refrigeration system. Also comprises a vapor compression type refrigerating device, a cold accumulation device 3 and a controller. The vapor compression refrigeration device comprises a compressor, a second condenser, a second throttle valve and a second evaporator 2; the cold accumulation device is internally loaded with cold accumulation medium. The absorption refrigeration system and vapor compression refrigeration apparatus are configured in a conventional manner and will not be described in further detail herein.
Wherein, the outlet pipe of first evaporimeter 1 passes through first delivery pipe 11 and connects cold-storage inlet tube of cold-storage device, and the outlet pipe of first evaporimeter 1 still passes through second delivery pipe 4 and connects water supply header 12, and water supply header is used for carrying chilled water to the user, and the cold-storage return pipe of cold-storage device is connected through first wet return 7 to the inlet tube of first evaporimeter, and the return water header 13 is connected through second wet return 8 to the inlet tube of first evaporimeter, and the return water header is used for carrying user side return water.
The water outlet pipe of the second evaporator 2 is connected with the water supply main pipe through a third water supply pipe 5, and the water inlet pipe of the second evaporator is connected with the water return main pipe through a third water return pipe 9.
The cold accumulation device 3 is connected with a water supply main pipe through a fourth water supply pipe 6, and the cold accumulation device is connected with a water return main pipe through a fourth water return pipe 10.
By the connection mode, the user side can adopt the absorption refrigeration system, the vapor compression refrigeration device and/or the cold accumulation device as a cold source.
The absorption refrigeration system uses solar energy as a heat source. The hot water supply end of the solar heat collector is connected with the heat source inlet end of the generator through a heat source water supply pipe, the heat source outlet end of the generator is connected with the hot water return end of the solar heat collector through a heat source water return pipe, a first temperature sensor is arranged on the heat source water supply pipe, a second temperature sensor is arranged on the heat source water return pipe, and the first temperature sensor and the second temperature sensor are both connected with the controller;
the first water supply pipe, the second water supply pipe, the third water supply pipe, the fourth water supply pipe, the first water return pipe, the second water return pipe, the third water return pipe and the fourth water return pipe are all provided with flow regulating valves (not shown in the figure) connected with the controller;
the heat exchange area of the first evaporator can be adjusted, and the controller adjusts the heat exchange area of the second evaporator according to the difference delta T between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. Through adjusting the heat transfer area of first evaporimeter, can adjust absorption refrigerating system's refrigerating output, when conventional use, can adopt less heat transfer area to satisfy conventional demand, for example when the required cold volume of user side is less or solar energy heat source is abundant, adopt less heat transfer area just can satisfy the demand, when the required cold volume of user side is great or solar energy is slightly not enough, switch to great heat transfer area, in order to improve the heat transfer volume of first heat exchanger, thereby increase user side cold volume. In the conventional arrangement in the field, when the heat source of the generator is insufficient and the cold energy provided by the absorption refrigeration system can not meet the requirement, the absorption refrigeration system is usually directly turned off to perform refrigeration in other modes, the slightly insufficient heat source is not utilized, so that energy waste is caused, or the absorption refrigeration system and other refrigeration devices are simultaneously turned on, however, at the moment, various refrigeration devices are simultaneously turned on, at the moment, the operation and maintenance cost is higher, and resources are wasted.
Further, the first evaporator includes a first heat exchange area F1 and a second heat exchange area F2, f2=β×f1, where 1< β+.ltoreq.2. The first evaporator is arranged into two parts, and the heat exchange areas of the two parts are different, so that the load regulation requirement can be better met.
Further, the controller controls the solar refrigeration system to operate according to the following method:
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device and the cold accumulation device are closed to discharge cold, the controller controls the first evaporator to adjust to a first heat exchange area, and the solar absorption refrigeration system is utilized to perform refrigeration and cold accumulation, wherein DeltaT=T1-T2; cop is the refrigeration coefficient of the absorption refrigeration system, cop = system refrigeration/system heat supply; m is M 1 Water flow for the heat source water supply pipe; t (T) Feed device The water temperature in the water outlet pipe of the first evaporator; t (T) Returning to The water temperature in the water inlet pipe of the first evaporator; m is M 2 To be at a known T Feed device And T Returning to Under the condition, the refrigerating water flow meeting the cooling capacity requirement of the user. When (when)And the refrigerating capacity generated by the absorption refrigerating system is larger than the user demand, and the redundant cold energy can be stored through the cold accumulation device.
If it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, and the controller controls the first evaporator to adjust to the second heat exchange area, wherein +.>And is also provided withAnd the cold accumulation mode and the cold discharge mode of the cold accumulation device are closed. When (when)When the system is used, the conventional connection mode of the system cannot meet the user demand, namely the first heat exchange area cannot meet the user cold energy demand, and the first evaporator is adjusted to the second heat exchange area at the moment so as to provide sufficient heat exchange quantity. In the invention, when the cold energy generated by the absorption refrigeration system can not meet the requirement, the heat exchange quantity of the evaporator in the absorption refrigeration system is increased, the absorption refrigeration system can be continuously adopted for independent refrigeration, and the energy waste caused by the fact that the absorption refrigeration system is closed or the absorption refrigeration system is simultaneously opened and the refrigeration of other modes in the prior art is solved.
If it isAnd Q is Storage device ≥Q User' s Simultaneously closing the solar absorption refrigeration device and the vapor compression refrigeration device, and opening a cold discharging mode of the cold accumulation device, wherein Q is as follows Storage device Is the cold accumulation amount of the cold accumulation device,Q user' s Is the cold energy demand of the user. If->And Q is Storage device ≤Q User' s And closing the cold discharging modes of the solar absorption type refrigerating device and the cold accumulating device, and opening the vapor compression type refrigerating device. When->And when the cold accumulation device can meet the user requirement, the cold accumulation device is adopted, otherwise, the vapor compression type refrigerating device is started.
Further, ifThe solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, the controller controls the first evaporator to adjust to the second heat exchange area, and the cold accumulation mode of the cold accumulation device is started, wherein gamma is more than or equal to 1.6. When the heat absorption capacity of the solar heat collector is large, the heat exchange area of the first evaporator can be adjusted to a large value, so that cold can be quickly stored, the energy consumption of the cold storage device is reduced, and the heat exchange area of the first evaporator can be adjusted to a small value, namely to the first heat exchange area, because the small heat exchange area can meet the cooling requirement of a user even when the heat exchange area is small.
Further, the cold accumulation medium adopts water or inorganic salt water solution.
Further, the first evaporator comprises a first heat exchanger and a second heat exchanger, wherein the heat exchange area of the first heat exchanger is a first heat exchange area F1, and the heat exchange area of the second heat exchanger is a second heat exchange area F2.
Further, the first heat exchanger and the second heat exchanger are arranged in parallel or in series.
The invention also provides a control method of the solar refrigeration system with the cold accumulation function, which comprises the following steps: the solar absorption refrigeration device comprises a solar heat collector and an absorption refrigeration system, wherein the absorption refrigeration system comprises a generator, a first condenser, a first throttle valve, a first evaporator and an absorber, and steam or hot water generated by the solar heat collector is used as a heat source of the absorption refrigeration system; further comprises: the vapor compression type refrigerating device comprises a compressor, a second condenser, a second throttle valve and a second evaporator; the cold accumulation device is internally provided with a cold accumulation medium; a controller;
wherein, the outlet pipe of first evaporimeter passes through the cold-storage inlet tube of first delivery pipe connection cold-storage device, and the outlet pipe of first evaporimeter still passes through the second delivery pipe and connects water supply header, and water supply header is used for carrying chilled water to the user, and the inlet tube of first evaporimeter passes through the cold-storage return pipe of first return pipe connection cold-storage device, and the inlet tube of first evaporimeter passes through the second return pipe and connects the return water header, and the return water header is used for carrying user side return water.
The water outlet pipe of the second evaporator is connected with the water supply main pipe through a third water supply pipe, and the water inlet pipe of the second evaporator is connected with the water return main pipe through a third water return pipe.
The cold accumulation device is connected with the water supply main pipe through a fourth water supply pipe, and is connected with the water return main pipe through a fourth water return pipe.
The hot water supply end of the solar heat collector is connected with the heat source inlet end of the generator through a heat source water supply pipe, the heat source outlet end of the generator is connected with the hot water return end of the solar heat collector through a heat source water return pipe, a first temperature sensor is arranged on the heat source water supply pipe, a second temperature sensor is arranged on the heat source water return pipe, and the first temperature sensor and the second temperature sensor are both connected with the controller.
The first water supply pipe, the second water supply pipe, the third water supply pipe, the fourth water supply pipe, the first water return pipe, the second water return pipe, the third water return pipe and the fourth water return pipe are all provided with flow regulating valves connected with the controller.
The first evaporator comprises a first heat exchange area F1 and a second heat exchange area F2, F2=beta.F1, wherein 1< beta.ltoreq.2, and the controller adjusts the heat exchange area of the second evaporator according to the difference delta T between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor.
Wherein, the controller adjusts the heat exchange area of the first evaporator according to the difference delta T between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor, and the method comprises the following steps:
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device and the cold accumulation device are closed to discharge cold, and the controller controls the first evaporator to adjust to the first heat exchange area;
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, and the controller controls the first evaporator to adjust to the second heat exchange area, wherein +.>And is also provided withAnd closing the cold accumulation mode and the cold discharge mode of the cold accumulation device;
wherein Δt=t1-T2; cop is the refrigeration coefficient of the absorption refrigeration system, cop = system refrigeration/system heat supply; m is M 1 Water flow for the heat source water supply pipe; t (T) Feed device The water temperature in the water outlet pipe of the first evaporator; t (T) Returning to The water temperature in the water inlet pipe of the first evaporator; m is M 2 To be at a known T Feed device And T Returning to Under the condition, the refrigerating water flow meeting the cooling capacity requirement of the user.
Further, the control method further comprises:
if it isAnd Q is Storage device ≥Q User' s Simultaneously closing the solar absorption type refrigerating device and the vapor compression type refrigerating device, and opening the cold storage device cold discharge dieWherein Q is Storage device To the cold accumulation amount of the cold accumulation device, Q User' s The cold energy demand is the user;
if it isAnd Q is Storage device ≤Q User' s Closing the cold discharging modes of the solar absorption type refrigerating device and the cold accumulating device, and opening the vapor compression type refrigerating device;
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, the controller controls the first evaporator to adjust to the second heat exchange area, and the cold accumulation mode of the cold accumulation device is started, wherein gamma is more than or equal to 1.6.
Further, the first evaporator comprises a first heat exchanger and a second heat exchanger, wherein the heat exchange area of the first heat exchanger is a first heat exchange area F1, the heat exchange area of the second heat exchanger is a second heat exchange area F2, and the first heat exchanger and the second heat exchanger are arranged in parallel or in series.
In the description of the present specification, the absorption refrigeration system and the vapor compression refrigeration apparatus are connected in a manner commonly used in the art, and the present invention is not focused on this, so that a detailed description is not given.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A solar refrigeration system with cold storage function, comprising: the solar absorption refrigeration device comprises a solar heat collector and an absorption refrigeration system, wherein the absorption refrigeration system comprises a generator, a first condenser, a first throttle valve, a first evaporator and an absorber, and steam or hot water generated by the solar heat collector is used as a heat source of the absorption refrigeration system; characterized by further comprising:
the vapor compression type refrigerating device comprises a compressor, a second condenser, a second throttle valve and a second evaporator;
the cold accumulation device is internally provided with a cold accumulation medium;
a controller;
wherein the water outlet pipe of the first evaporator is connected with the cold accumulation water inlet pipe of the cold accumulation device through a first water supply pipe, the water outlet pipe of the first evaporator is also connected with a water supply main pipe through a second water supply pipe, the water supply main pipe is used for conveying chilled water to a user, the water inlet pipe of the first evaporator is connected with the cold accumulation water return pipe of the cold accumulation device through a first water return pipe, the water inlet pipe of the first evaporator is connected with a water return main pipe through a second water return pipe, the water return main pipe is used for conveying water on the user side,
the water outlet pipe of the second evaporator is connected with the water supply main pipe through a third water supply pipe, and the water inlet pipe of the second evaporator is connected with the water return main pipe through a third water return pipe;
the cold accumulation device is connected with the water supply main pipe through a fourth water supply pipe, and is connected with the water return main pipe through a fourth water return pipe;
the hot water supply end of the solar heat collector is connected with the heat source inlet end of the generator through a heat source water supply pipe, the heat source outlet end of the generator is connected with the hot water return end of the solar heat collector through a heat source water return pipe, a first temperature sensor is arranged on the heat source water supply pipe, a second temperature sensor is arranged on the heat source water return pipe, and the first temperature sensor and the second temperature sensor are both connected with the controller;
the first water supply pipe, the second water supply pipe, the third water supply pipe, the fourth water supply pipe, the first water return pipe, the second water return pipe, the third water return pipe and the fourth water return pipe are all provided with flow regulating valves connected with the controller;
the heat exchange area of the first evaporator can be adjusted, and the controller adjusts the heat exchange area of the second evaporator according to the difference delta T between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor.
2. The solar refrigeration system with cold storage function according to claim 1, wherein the cold storage medium is water or an inorganic salt water solution.
3. The solar refrigeration system with cold accumulation function according to claim 1, wherein the first evaporator comprises a first heat exchanger and a second heat exchanger, wherein the heat exchange area of the first heat exchanger is a first heat exchange area F1, and the heat exchange area of the second heat exchanger is a second heat exchange area F2.
4. A solar refrigeration system with cold storage function according to claim 3, wherein the first heat exchanger and the second heat exchanger are arranged in parallel or in series.
5. The control method of the solar refrigeration system with the cold accumulation function is characterized in that the first evaporator comprises a first heat exchange area F1 and a second heat exchange area F2, F2=beta.F1, wherein 1< beta.ltoreq.2.
6. The control method of a solar refrigeration system with a cold accumulation function according to claim 5, wherein the controller adjusts a heat exchange area of the second evaporator according to a difference Δt between a temperature T1 detected by the first temperature sensor and a temperature T2 detected by the second temperature sensor;
wherein, the controller adjusts the heat exchange area of the first evaporator according to the difference delta T between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor, and the method comprises the following steps:
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device and the cold accumulation device are closed to discharge cold, and the controller controls the first evaporator to adjust to the first heat exchange area;
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, and the controller controls the first evaporator to adjust to the second heat exchange area, wherein +.>And is also provided withAnd closing the cold accumulation mode and the cold discharge mode of the cold accumulation device;
wherein Δt=t1-T2; cop is the refrigeration coefficient of the absorption refrigeration system, cop = system refrigeration/system heat supply; m is M 1 Water flow for the heat source water supply pipe; t (T) Feed device The water temperature in the water outlet pipe of the first evaporator; t (T) Returning to The water temperature in the water inlet pipe of the first evaporator; m is M 2 To be at a known T Feed device And T Returning to Under the condition, the refrigerating water flow meeting the cooling capacity requirement of the user.
7. The control method of a solar refrigeration system with a cold storage function according to claim 6, further comprising:
if it isAnd Q is Storage device ≥Q User' s Simultaneously closing the solar absorption refrigeration device and the vapor compression refrigeration device, and opening a cold discharging mode of the cold accumulation device, wherein Q is as follows Storage device To the cold accumulation amount of the cold accumulation device, Q User' s The cold energy demand is the user;
if it isAnd Q is Storage device ≤Q User' s The solar absorption refrigeration device and the cold storage device are closed to discharge cold, the vapor compression refrigeration device is opened,
if it isThe solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, the controller controls the first evaporator to adjust to the second heat exchange area, and the cold accumulation mode of the cold accumulation device is started, wherein gamma is more than or equal to 1.6.
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