Solar energy refrigeration system with cold storage function and control method thereof

Abstract

The application discloses a solar refrigeration system with a cold storage function, comprising a solar absorption refrigeration device, wherein the solar absorption refrigeration device comprises a solar heat collector and an absorption refrigeration system, the absorption refrigeration system comprises a generator, a first condenser, a first throttling valve, a first evaporator and an absorber, steam or hot water generated by the solar heat collector is used as a heat source of the absorption refrigeration system, and the solar refrigeration system further comprises a vapor compression refrigeration device, a cold storage device and a controller. The solar refrigeration system with the cold storage function and the control method thereof can maximize utilization of solar energy resources and fully utilize the advantages of the absorption refrigeration system, and solve the problem of energy waste caused by closing the absorption refrigeration system or simultaneously starting the absorption refrigeration system and other mode refrigeration in the prior art.

Description

Technical Field

[0001] This invention relates to the field of solar refrigeration technology, specifically to a solar refrigeration system with cold storage function and its control method. Background Technology

[0002] As a renewable energy source, solar energy is being used more and more widely. There are already systems that use solar energy for cooling. However, solar energy is uncertain and closely related to weather changes. When solar energy resources are insufficient, how to meet users' cooling needs has become an urgent problem to be solved.

[0003] Solar-powered cooling systems mainly include solar absorption cooling systems, solar adsorption cooling systems, and solar jet cooling systems.

[0004] The working principle of an absorption refrigeration system is as follows: the refrigerant liquid absorbs heat and evaporates in the evaporator, and the resulting vapor is absorbed by the absorbent. After that, the absorbent that has absorbed the refrigerant vapor is pumped to the generator by a solution pump, where it is heated and the refrigerant vapor is separated. The vapor is condensed into liquid in the condenser and then enters the evaporator after being throttled.

[0005] However, in existing absorption refrigeration systems, when the heat source of the generator is insufficient and the cooling capacity provided by the absorption refrigeration system cannot meet the demand, the absorption refrigeration system is usually shut down directly and other cooling methods are used instead, no longer utilizing the slightly insufficient heat source, resulting in energy waste. Alternatively, the absorption refrigeration system and other refrigeration devices may be turned on at the same time. However, when multiple refrigeration devices are turned on at the same time, the operation and maintenance costs are high, which wastes resources. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a solar-powered refrigeration system with cold storage function and its control method, aiming to solve the aforementioned problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A solar-powered refrigeration system with cold storage function includes: a solar absorption refrigeration device, which comprises a solar collector and an absorption refrigeration system. The absorption refrigeration system includes a generator, a first condenser, a first expansion valve, a first evaporator, and an absorber. The steam or hot water generated by the solar collector serves as the heat source for the absorption refrigeration system. The system also includes:

[0009] A vapor compression refrigeration unit, comprising a compressor, a second condenser, a second expansion valve, and a second evaporator;

[0010] A cold storage device, which contains a cold storage medium;

[0011] Controller;

[0012] The first evaporator's outlet pipe is connected to the cold storage inlet pipe of the cold storage unit via a first supply pipe. The first evaporator's outlet pipe is also connected to the main supply pipe via a second supply pipe. The main supply pipe is used to supply chilled water to users. The first evaporator's inlet pipe is connected to the cold storage return pipe of the cold storage unit via a first return pipe. The first evaporator's inlet pipe is connected to the main return pipe via a second return pipe. The main return pipe is used to supply return water from the user side.

[0013] The outlet pipe of the second evaporator is connected to the main water supply pipe through the third water supply pipe, and the inlet pipe of the second evaporator is connected to the main return water pipe through the third return water pipe.

[0014] The cold storage device is connected to the main water supply pipe through the fourth water supply pipe, and the cold storage device is connected to the main return water pipe through the fourth return water pipe.

[0015] The hot water supply end of the solar collector is connected to the heat source inlet end of the generator through a heat source supply pipe, and the heat source outlet end of the generator is connected to the hot water return end of the solar collector through a heat source return pipe. A first temperature sensor is installed on the heat source supply pipe, and a second temperature sensor is installed on the heat source return pipe. Both the first and second temperature sensors are connected to the controller.

[0016] The first water supply pipe, the second water supply pipe, the third water supply pipe, the fourth water supply pipe, the first return water pipe, the second return water pipe, the third return water pipe, and the fourth return water pipe are all equipped with flow regulating valves connected to the controller;

[0017] The heat exchange area of ​​the first evaporator can be adjusted, and the controller adjusts the temperature based on the difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. T adjusts the heat exchange area of ​​the first evaporator.

[0018] Preferably, the cold storage medium is water or an aqueous solution of inorganic salts.

[0019] Preferably, the first evaporator includes 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.

[0020] Preferably, the first heat exchanger and the second heat exchanger are arranged in parallel or in series.

[0021] A control method for a solar refrigeration system with cold storage function, characterized in that the first evaporator includes a first heat exchange area F1 and a second heat exchange area F2, F2=β*F1, where 1<β≤2.

[0022] Preferably, the controller uses the difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. T adjusts the heat exchange area of ​​the first evaporator;

[0023] The controller uses the temperature difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. Adjusting the heat exchange area of ​​the first evaporator includes the following steps:

[0024] like Then the solar absorption refrigeration device is turned on, the vapor compression refrigeration device and the cold storage device are turned off in the cold release mode, and the controller controls the first evaporator to adjust to the first heat exchange area.

[0025] like Then, the solar absorption refrigeration unit is turned on, the vapor compression refrigeration unit is turned off, and the controller adjusts the first evaporator to the second heat exchange area. ,and And shut down the cold storage device's cold storage mode and cold release mode;

[0026] in T = T1 - T2; cop is the coefficient of performance of the absorption refrigeration system, cop = system cooling capacity / system heating capacity; The water flow rate of the heat source water supply pipe; The water temperature inside the outlet pipe of the first evaporator; The water temperature inside the inlet pipe of the first evaporator; For in the known and Under these conditions, the chilled water flow rate is required to meet the user's cooling needs.

[0027] Preferably, the control method further includes:

[0028] like ,and Then, both the solar absorption refrigeration unit and the vapor compression refrigeration unit will be shut down simultaneously, and the cold storage unit will be activated in its cold release mode. The cold storage capacity of the cold storage device. For users' cooling demand;

[0029] like ,and Then, the solar absorption refrigeration unit and the cold storage unit will be shut down in their cooling mode, and the vapor compression refrigeration unit will be turned on.

[0030] like Then, the solar absorption refrigeration unit is turned on, the vapor compression refrigeration unit is turned off, the controller adjusts the first evaporator to the second heat exchange area, and the cold storage unit is activated in cold storage mode. ≥1.6.

[0031] Beneficial effects

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] This invention provides a solar-powered refrigeration system with cold storage function and its control method. When solar energy is slightly insufficient, the cooling capacity generated by the absorption refrigeration system cannot meet the needs. At this time, the heat exchange capacity of the evaporator in the absorption refrigeration system is increased, and the absorption refrigeration system can continue to be used for refrigeration alone. By utilizing solar energy resources, this invention solves the energy waste caused by shutting down the absorption refrigeration system or simultaneously turning on the absorption refrigeration system and other refrigeration methods in the prior art. It can maximize the utilization of solar energy resources and make full use of the advantages of the absorption refrigeration system. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a solar-powered refrigeration system with cold storage function according to an embodiment of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The following describes a solar-powered refrigeration system with cold storage function and its control method according to an embodiment of the present invention, with reference to the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of a solar-powered refrigeration system with cold storage function according to an embodiment of the present invention;

[0038] The solar-powered refrigeration system with cold storage function of the present invention includes: a solar absorption refrigeration device, which comprises a solar collector and an absorption refrigeration system. The absorption refrigeration system includes a generator, a first condenser, a first expansion valve, a first evaporator 1, and an absorber. The steam or hot water generated by the solar collector serves as the heat source for the absorption refrigeration system. It also includes a vapor compression refrigeration device, a cold storage device 3, and a controller. The vapor compression refrigeration device includes a compressor, a second condenser, a second expansion valve, and a second evaporator 2; the cold storage device contains a cold storage medium. The absorption refrigeration system and the vapor compression refrigeration device are configured in a conventional manner and will not be described in detail here.

[0039] The outlet pipe of the first evaporator 1 is connected to the cold storage inlet pipe of the cold storage device through the first water supply pipe 11. The outlet pipe of the first evaporator 1 is also connected to the main water supply pipe 12 through the second water supply pipe 4. The main water supply pipe is used to deliver chilled water to users. The inlet pipe of the first evaporator is connected to the cold storage return pipe of the cold storage device through the first return pipe 7. The inlet pipe of the first evaporator is connected to the return water main pipe 13 through the second return pipe 8. The return water main pipe is used to deliver return water from the user side.

[0040] The outlet pipe of the second evaporator 2 is connected to the main water supply pipe through the third water supply pipe 5, and the inlet pipe of the second evaporator is connected to the main return water pipe through the third return water pipe 9.

[0041] The cold storage device 3 is connected to the main water supply pipe through the fourth water supply pipe 6, and the cold storage device is connected to the main return water pipe through the fourth return water pipe 10.

[0042] With the above connection method, the user side can use an absorption refrigeration system, a vapor compression refrigeration device, and / or a cold storage device as a cold source.

[0043] The absorption refrigeration system uses solar energy as a heat source. The hot water supply end of the solar collector is connected to the heat source inlet end of the generator through a heat source supply pipe, and the heat source outlet end of the generator is connected to the hot water return end of the solar collector through a heat source return pipe. A first temperature sensor is installed on the heat source supply pipe, and a second temperature sensor is installed on the heat source return pipe. Both the first and second temperature sensors are connected to the controller.

[0044] Each of the first water supply pipe, second water supply pipe, third water supply pipe, fourth water supply pipe, first return water pipe, second return water pipe, third return water pipe, and fourth return water pipe is equipped with a flow regulating valve (not shown in the figure) connected to the controller.

[0045] The heat exchange area of ​​the first evaporator can be adjusted, and the controller adjusts the temperature based on the difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. T adjusts the heat exchange area of ​​the first evaporator. By adjusting the heat exchange area of ​​the first evaporator, the cooling capacity of the absorption refrigeration system can be adjusted. In normal use, a smaller heat exchange area can be used to meet normal needs. For example, when the cooling capacity required by the user is small or the solar heat source is sufficient, a smaller heat exchange area is sufficient. When the cooling capacity required by the user is large or the solar energy is slightly insufficient, a larger heat exchange area is used to increase the heat exchange capacity of the first heat exchanger, thereby increasing the cooling capacity on the user side. In conventional settings in the art, when the heat source of the generator is insufficient and the cooling capacity provided by the absorption refrigeration system cannot meet the demand, the absorption refrigeration system is usually directly shut down and other cooling methods are used, no longer utilizing the slightly insufficient heat source, resulting in energy waste. Alternatively, the absorption refrigeration system and other refrigeration devices are turned on simultaneously. However, when multiple refrigeration devices are turned on at the same time, the operation and maintenance costs are high and resources are wasted. In order to solve the above problems, the present invention sets the evaporator of the absorption refrigeration system to have an adjustable area, which can adjust the heat exchange area of ​​the evaporator according to the heat source status, thereby adjusting the cooling capacity of the absorption refrigeration system.

[0046] Furthermore, the first evaporator includes a first heat exchange area F1 and a second heat exchange area F2, where F2 = β * F1, and 1 < β ≤ 2. Setting the first evaporator into two parts with different heat exchange areas better meets load regulation requirements.

[0047] Furthermore, the controller controls the operation of the solar cooling system according to the following methods:

[0048] like Then, the solar absorption refrigeration unit is activated, while the vapor compression refrigeration unit and the cold storage unit are deactivated in cold release mode. The controller adjusts the first evaporator to the first heat exchange area, utilizing the solar absorption refrigeration system for both cooling and cold storage. T = T1 - T2; cop is the coefficient of performance of the absorption refrigeration system, cop = system cooling capacity / system heating capacity; M1 is the water flow rate of the heat source supply pipe; T 供 The water temperature in the outlet pipe of the first evaporator; T 回 M1 is the water temperature in the inlet pipe of the first evaporator; M2 is the water temperature at a given T. 供 and T 回 Under certain conditions, the chilled water flow rate should meet the user's cooling capacity requirements. When the solar collector generates sufficient heat, a smaller heat exchange area is sufficient to meet the user's needs. Furthermore, the cooling capacity generated by the absorption refrigeration system exceeds the user's needs, and the excess cooling capacity can be stored through a cold storage device.

[0049] like Then, the solar absorption refrigeration unit is turned on, the vapor compression refrigeration unit is turned off, and the controller adjusts the first evaporator to the second heat exchange area. ,and And shut down the cold storage device's cold storage mode and cold release mode. When When the conventional connection method of this system cannot meet the user's needs, that is, the first heat exchange area cannot meet the user's cooling capacity requirements, the first evaporator is adjusted to the second heat exchange area to provide sufficient heat exchange. In this invention, when the cooling capacity generated by the absorption refrigeration system is insufficient, the heat exchange capacity of the evaporator in the absorption refrigeration system is increased, allowing the absorption refrigeration system to continue to provide cooling independently. This solves the energy waste caused by shutting down the absorption refrigeration system or simultaneously turning on the absorption refrigeration system and other cooling methods in the prior art.

[0050] like And Q 蓄 ≥Q 用户 Then, both the solar absorption refrigeration unit and the vapor compression refrigeration unit will be shut down simultaneously, and the cold storage unit will be activated in cold release mode, where Q 蓄 Q represents the cold storage capacity of the cold storage device. 用户 This refers to the user's cooling capacity requirements. If... And Q 蓄 ≤Q 用户 Then, the solar absorption refrigeration unit and the cold storage unit's cooling mode are turned off, and the vapor compression refrigeration unit is turned on. When When the signal is 0, it indicates that the cooling capacity generated by the solar absorption refrigeration device is insufficient. Even if the first evaporator has a large heat exchange area, it cannot meet the user's needs. Therefore, the absorption refrigeration system is shut down at this time. If the cold storage device can meet the user's needs, the cold storage device is used; otherwise, the vapor compression refrigeration device is turned on.

[0051] Furthermore, if Then, the solar absorption refrigeration unit is turned on, the vapor compression refrigeration unit is turned off, the controller adjusts the first evaporator to the second heat exchange area, and the cold storage unit is activated in cold storage mode. ≥1.6. When the solar collector absorbs a large amount of heat, the heat exchange area of ​​the first evaporator can be adjusted to a larger value, thereby enabling rapid cold storage and reducing the energy consumption of the cold storage device. Of course, the heat exchange area of ​​the first evaporator can also be adjusted to a smaller value, i.e., adjusted to the first heat exchange area, because even a smaller heat exchange area can meet the user's cooling needs.

[0052] Furthermore, the cold storage medium is water or an aqueous solution of inorganic salts.

[0053] Furthermore, the first evaporator includes 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.

[0054] Furthermore, the first heat exchanger and the second heat exchanger are arranged in parallel or in series.

[0055] This invention also provides a control method for a solar refrigeration system with cold storage function, comprising: a solar absorption refrigeration device, which includes a solar collector and an absorption refrigeration system, the absorption refrigeration system including a generator, a first condenser, a first expansion valve, a first evaporator, and an absorber, wherein steam or hot water generated by the solar collector serves as the heat source for the absorption refrigeration system; further comprising: a vapor compression refrigeration device, which includes a compressor, a second condenser, a second expansion valve, and a second evaporator; a cold storage device, which carries a cold storage medium; and a controller;

[0056] The water outlet pipe of the first evaporator is connected to the cold storage inlet pipe of the cold storage device through the first water supply pipe. The water outlet pipe of the first evaporator is also connected to the main water supply pipe through the second water supply pipe. The main water supply pipe is used to deliver chilled water to users. The water inlet pipe of the first evaporator is connected to the cold storage return pipe of the cold storage device through the first return pipe. The water inlet pipe of the first evaporator is connected to the return water main pipe through the second return pipe. The return water main pipe is used to deliver return water from the user side.

[0057] The outlet pipe of the second evaporator is connected to the main water supply pipe through the third water supply pipe, and the inlet pipe of the second evaporator is connected to the main return water pipe through the third return water pipe.

[0058] The cold storage device is connected to the main water supply pipe through the fourth water supply pipe, and the cold storage device is connected to the main return water pipe through the fourth return water pipe.

[0059] The hot water supply end of the solar collector is connected to the heat source inlet end of the generator through a heat source supply pipe. The heat source outlet end of the generator is connected to the hot water return end of the solar collector through a heat source return pipe. A first temperature sensor is installed on the heat source supply pipe, and a second temperature sensor is installed on the heat source return pipe. Both the first and second temperature sensors are connected to the controller.

[0060] The first water supply pipe, the second water supply pipe, the third water supply pipe, the fourth water supply pipe, the first return water pipe, the second return water pipe, the third return water pipe, and the fourth return water pipe are all equipped with flow regulating valves connected to the controller.

[0061] The first evaporator includes a first heat exchange area F1 and a second heat exchange area F2, where F2 = β * F1, and 1 < β ≤ 2. The controller calculates the temperature difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. T adjusts the heat exchange area of ​​the first evaporator.

[0062] The controller uses the temperature difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. Adjusting the heat exchange area of ​​the first evaporator includes the following steps:

[0063] like Then the solar absorption refrigeration device is turned on, the vapor compression refrigeration device and the cold storage device are turned off in the cold release mode, and the controller controls the first evaporator to adjust to the first heat exchange area.

[0064] like Then, the solar absorption refrigeration unit is turned on, the vapor compression refrigeration unit is turned off, and the controller adjusts the first evaporator to the second heat exchange area. ,and And shut down the cold storage device's cold storage mode and cold release mode;

[0065] in T = T1 - T2; cop is the coefficient of performance of the absorption refrigeration system, cop = system cooling capacity / system heating capacity; M1 is the water flow rate of the heat source supply pipe; T 供 The water temperature in the outlet pipe of the first evaporator; T 回 M1 is the water temperature in the inlet pipe of the first evaporator; M2 is the water temperature at a given T. 供 and T 回 Under these conditions, the chilled water flow rate is required to meet the user's cooling needs.

[0066] Furthermore, control methods also include:

[0067] like And Q 蓄 ≥Q 用户 Then, both the solar absorption refrigeration unit and the vapor compression refrigeration unit will be shut down simultaneously, and the cold storage unit will be activated in cold release mode, where Q 蓄 Q represents the cold storage capacity of the cold storage device. 用户 For users' cooling demand;

[0068] like And Q 蓄 ≤Q 用户 If the solar absorption refrigeration unit and the cold storage unit are turned off in cooling mode, the vapor compression refrigeration unit will be turned on.

[0069] like Then, the solar absorption refrigeration unit is turned on, the vapor compression refrigeration unit is turned off, the controller adjusts the first evaporator to the second heat exchange area, and the cold storage unit is activated in cold storage mode. ≥1.6.

[0070] Furthermore, the first evaporator includes 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.

[0071] In the description of this specification, the absorption refrigeration system and the vapor compression refrigeration device adopt the connection method commonly used in the art. This is not the focus of the present invention, so it is not described in detail.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] Although embodiments of the 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 to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A solar-powered refrigeration system with cold storage function, comprising: A solar absorption refrigeration device, comprising a solar collector and an absorption refrigeration system, wherein the absorption refrigeration system includes a generator, a first condenser, a first expansion valve, a first evaporator, and an absorber, wherein steam or hot water generated by the solar collector serves as the heat source for the absorption refrigeration system; characterized in that it further includes: A vapor compression refrigeration unit, comprising a compressor, a second condenser, a second expansion valve, and a second evaporator; A cold storage device, which contains a cold storage medium; Controller; The first evaporator's outlet pipe is connected to the cold storage inlet pipe of the cold storage unit via a first supply pipe. The first evaporator's outlet pipe is also connected to the main supply pipe via a second supply pipe. The main supply pipe is used to supply chilled water to users. The first evaporator's inlet pipe is connected to the cold storage return pipe of the cold storage unit via a first return pipe. The first evaporator's inlet pipe is connected to the main return pipe via a second return pipe. The main return pipe is used to supply return water from the user side. The outlet pipe of the second evaporator is connected to the main water supply pipe through the third water supply pipe, and the inlet pipe of the second evaporator is connected to the main return water pipe through the third return water pipe. The cold storage device is connected to the main water supply pipe through the fourth water supply pipe, and the cold storage device is connected to the main return water pipe through the fourth return water pipe. The hot water supply end of the solar collector is connected to the heat source inlet end of the generator through a heat source supply pipe, and the heat source outlet end of the generator is connected to the hot water return end of the solar collector through a heat source return pipe. A first temperature sensor is installed on the heat source supply pipe, and a second temperature sensor is installed on the heat source return pipe. Both the first and second temperature sensors are connected to the controller. The first water supply pipe, the second water supply pipe, the third water supply pipe, the fourth water supply pipe, the first return water pipe, the second return water pipe, the third return water pipe, and the fourth return water pipe are all equipped with flow regulating valves connected to the controller; The heat exchange area of ​​the first evaporator can be adjusted, and the controller adjusts the temperature based on the difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. The heat exchange area of ​​the first evaporator is adjusted by ΔT. When ΔT increases, the heat exchange area of ​​the first evaporator decreases, and when ΔT decreases, the heat exchange area of ​​the first evaporator increases.

2. The solar refrigeration system with cold storage function according to claim 1, characterized in that, The cold storage medium is water or an aqueous solution of inorganic salts.

3. The solar refrigeration system with cold storage function according to claim 1, characterized in that, The first evaporator includes a first heat exchanger and a second heat exchanger, wherein the heat exchange area of ​​the first heat exchanger is the first heat exchange area F1, and the heat exchange area of ​​the second heat exchanger is the second heat exchange area F2.

4. The solar refrigeration system with cold storage function according to claim 3, characterized in that, The first heat exchanger and the second heat exchanger can be connected in parallel or in series.

5. A control method for a solar refrigeration system with cold storage function, wherein the method uses the implementation of the solar refrigeration system with cold storage function as described in any one of claims 1-4, characterized in that, The first evaporator is installed in the absorption refrigeration system of the solar absorption refrigeration device. The first evaporator includes a first heat exchange area F1 and a second heat exchange area F2, where F2=β*F1, and 1<β≤2.

6. The control method for a solar refrigeration system with cold storage function according to claim 5, characterized in that, The controller uses the temperature difference T1 detected by the first temperature sensor and T2 detected by the second temperature sensor. T adjusts the heat exchange area of ​​the first evaporator; The controller uses the temperature difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor. Adjusting the heat exchange area of ​​the first evaporator includes the following steps: like Then the solar absorption refrigeration device is turned on, the vapor compression refrigeration device and the cold storage device are turned off in the cold release mode, and the controller controls the first evaporator to adjust to the first heat exchange area. like Then, the solar absorption refrigeration unit is turned on, the vapor compression refrigeration unit is turned off, and the controller adjusts the first evaporator to the second heat exchange area. ,and And shut down the cold storage device's cold storage mode and cold release mode; in T = T1 - T2; cop is the coefficient of performance of the absorption refrigeration system, cop = system cooling capacity / system heating capacity; The water flow rate of the heat source water supply pipe; The water temperature inside the outlet pipe of the first evaporator; The water temperature inside the inlet pipe of the first evaporator; For in the known and Under these conditions, the chilled water flow rate is required to meet the user's cooling needs.

7. The control method for a solar refrigeration system with cold storage function according to claim 6, characterized in that, The control method further includes: like ,and Then, both the solar absorption refrigeration unit and the vapor compression refrigeration unit will be shut down simultaneously, and the cold storage unit will be activated in its cold release mode. The cold storage capacity of the cold storage device. For users' cooling demand; like ,and Then, the solar absorption refrigeration unit and the cold storage unit will be shut down in their cooling mode, and the vapor compression refrigeration unit will be turned on. like Then, the solar absorption refrigeration unit is turned on, the vapor compression refrigeration unit is turned off, the controller adjusts the first evaporator to the second heat exchange area, and the cold storage unit is activated in cold storage mode. ≥1.6.

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