CN214307680U

CN214307680U - Composite refrigeration system

Info

Publication number: CN214307680U
Application number: CN202023176950.XU
Authority: CN
Inventors: 李大全; 杨蓉; 汪魁; 罗胜
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-09-28
Anticipated expiration: 2030-12-25

Abstract

The present application provides a compound refrigeration system. The composite refrigeration system comprises an evaporative cooling system (6) and a magnetic refrigeration system, wherein the magnetic refrigeration system comprises a first pump (1), a first heat exchanger (2), a first cold accumulator (3), a second heat exchanger (4) and a second cold accumulator (5) which are sequentially connected, the evaporative cooling system (6) is configured to perform evaporative cooling on the first heat exchanger (2) so as to adjust the temperature of heat exchange fluid in the first heat exchanger (2), and an outlet of the first pump (1) can be selectively communicated with the first heat exchanger (2) or the second heat exchanger (4). According to the composite refrigeration system, the working temperature of the magnetic thermal material can be improved, the problems of large cooling capacity and large temperature span are considered, and the working efficiency of the composite refrigeration system is improved.

Description

Composite refrigeration system

Technical Field

The application relates to the technical field of refrigeration, in particular to a composite refrigeration system.

Background

With the increasingly obvious disadvantages of the traditional vapor compression refrigeration technology in terms of environmental unfriendliness and heat exchange efficiency, the research and development of novel refrigeration technology (non-vapor compression refrigeration) is pressing. The magnetic refrigeration technology is one of the novel refrigeration technologies with the best development prospect, particularly has outstanding advantages in the aspects of environmental friendliness and high efficiency, and compared with the traditional vapor compression refrigeration, the refrigeration efficiency of the magnetic refrigeration can reach 40-50% of Carnot cycle efficiency and is about 30% higher than that of the traditional compression refrigeration mode; the external magnetic refrigeration mode adopts magnetic materials to carry out solid-liquid heat exchange, and has no gas harmful to the environment; and the running frequency of the magnetic composite refrigeration system is low, and the generated noise is low. With the above advantages, the magnetic refrigeration technology has become a new refrigeration technology which has received the highest attention in recent years.

The magnetic composite refrigeration system is a device for refrigerating by utilizing the physical characteristics of a magnetocaloric material, and the technical basis of the device is the magnetocaloric effect of the magnetocaloric material, namely: when a changing magnetic field is applied to the magnetocaloric material, the temperature of the magnetocaloric material is increased or decreased, the magnetic entropy of the material is decreased when the magnetic field strength is increased, heat is released, the temperature is increased, and the magnetic entropy of the material is increased when the magnetic field strength is decreased, heat is absorbed, and the temperature is decreased. However, due to the limitation of the material property of the existing magnetocaloric material, the environmental temperature application range of the magnetic composite refrigeration system is greatly limited, and the problem that large refrigeration capacity and large temperature span cannot be considered is solved.

Patent document US20070240428a1 discloses a composite refrigeration system, which adopts a hybrid refrigeration system, the system includes a vapor compression refrigeration cycle device for first refrigerant circulation and a magnetic refrigeration cycle device for second refrigerant circulation, the technical scheme is that a hot end heat exchanger for magnetic refrigeration circulation exchanges heat with a cold end heat exchanger for vapor compression refrigeration circulation, and heat exchange fluid in the magnetic refrigeration cycle system can be cooled in two stages, so that the cold end heat exchanger in the magnetic refrigeration cycle system can reach lower temperature, and further deep refrigeration is realized.

The above prior art still cannot solve the problem of poor popularization due to small temperature span of the magnetic refrigeration system.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present application is to provide a composite refrigeration system, which can improve the working temperature of the magnetocaloric material, take account of the problem of large cooling capacity and large temperature span, and improve the working efficiency of the composite refrigeration system.

In order to solve the above problem, the present application provides a composite refrigeration system, including an evaporative cooling system and a magnetic refrigeration system, the magnetic refrigeration system includes a first pump, a first heat exchanger, a first regenerator, a second heat exchanger and a second regenerator that are connected in order, the evaporative cooling system is configured to perform evaporative cooling on the first heat exchanger to adjust the temperature of the heat exchange fluid in the first heat exchanger, and an outlet of the first pump can be selectively communicated with the first heat exchanger or the second heat exchanger.

Preferably, the first pump is a bidirectional pump.

Preferably, the magnetic refrigeration system further comprises a control valve configured to regulate the flow path of the heat exchange fluid of the first pump outlet to enable the outlet of the first pump to selectively communicate with the first heat exchanger or the second heat exchanger.

Preferably, the evaporative cooling system includes a water tank, a second pump configured to pump water of the water tank to the spray device, and the spray device is disposed above the first heat exchanger, the spray device being configured to spray the first heat exchanger.

Preferably, the water tank is disposed below the first heat exchanger, and recovers shower water of the shower device.

Preferably, the evaporative cooling system further comprises an air inlet and an air outlet, and the first heat exchanger is arranged between the air inlet and the air outlet.

Preferably, the evaporative cooling system further comprises a fan, the air outlet is arranged above the spraying device, the air inlet is arranged corresponding to the bottom of the first heat exchanger, and the fan is arranged at the air outlet.

Preferably, a first bypass pipeline is arranged outside the first cold accumulator in parallel, and a first control valve is arranged on the first bypass pipeline; and/or a second bypass pipeline is arranged outside the second cold accumulator in parallel, and a second control valve is arranged on the second bypass pipeline.

The application provides a compound refrigerating system, including evaporative cooling system and magnetism refrigerating system, magnetism refrigerating system is including the first pump, first heat exchanger, first regenerator, second heat exchanger and the second regenerator that connect gradually, and evaporative cooling system is configured to carry out evaporative cooling to first heat exchanger. The composite refrigeration system can control the temperature of the fluid in the first heat exchanger through the evaporative cooling system, so that the temperature of the fluid in the first heat exchanger can be adjusted to a temperature range suitable for working of the magnetocaloric material, the refrigeration efficiency of the composite refrigeration system can be improved, large refrigeration capacity and large temperature span can be realized, and the working efficiency of the composite refrigeration system can be improved.

Drawings

FIG. 1 is a system block diagram of a compound refrigeration system according to one embodiment of the present application;

FIG. 2 is a schematic view of the magnetic refrigeration mode of the compound refrigeration system of one embodiment of the present application;

FIG. 3 is a schematic view of an evaporative cooling mode of the compound refrigeration system of one embodiment of the present application;

FIG. 4 is a system block diagram of a compound refrigeration system according to an embodiment of the present application;

fig. 5 is a flowchart of a control method of a compound refrigeration system according to an embodiment of the present application.

The reference numerals are represented as:

1. a first pump; 2. a first heat exchanger; 3. a first regenerator; 4. a second heat exchanger; 5. a second regenerator; 6. an evaporative cooling system; 61. a water tank; 62. a second pump; 63. a spraying device; 64. a fan; 65. an air inlet; 66. an air outlet.

Detailed Description

Referring to fig. 1 to 4 in combination, according to an embodiment of the present application, the composite refrigeration system includes an evaporative cooling system 6 and a magnetic refrigeration system, the magnetic refrigeration system includes a first pump 1, a first heat exchanger 2, a first regenerator 3, a second heat exchanger 4 and a second regenerator 5 connected in sequence, the evaporative cooling system 6 is configured to perform evaporative cooling on the first heat exchanger 2 to adjust the temperature of a heat exchange fluid in the first heat exchanger 2, and an outlet of the first pump 1 can be selectively communicated with the first heat exchanger 2 or the second heat exchanger 4.

The working principle of the magnetic refrigeration system in the prior art is as follows: the magnetic field that applies the change to the magnetocaloric material can make it take place the magnetocaloric effect, and when magnetic field generator applyed the magnetic field to the regenerator (added magnetism), the magnetocaloric material can outwards release heat, and when magnetic field generator got rid of the magnetic field to the regenerator (demagnetized), the magnetocaloric material can outwards release cold volume. The mode of the magnetic field generator generating the variable magnetic field can be the variable magnetic field generated by an electromagnet, and can also be the variable magnetic field generated by the movement of a permanent magnet and a cold accumulator.

Because the magnetic refrigeration system is influenced by the existing magnetic refrigeration material, the problem of high difficulty in establishing a large temperature span exists, and the popularization and the application of the magnetic refrigeration system are greatly hindered. The present application addresses this problem with magnetic refrigeration systems.

The composite refrigeration system can control the temperature of the fluid in the first heat exchanger 2 through the evaporative cooling system, so that the temperature of the fluid in the first heat exchanger 2 can be adjusted to a temperature range suitable for working of the magnetocaloric material, the refrigeration efficiency of the composite refrigeration system can be improved, large refrigeration capacity and large temperature span can be realized, and the working efficiency of the composite refrigeration system can be improved.

In one embodiment, the first pump 1 is a bi-directional pump.

In one embodiment, the first pump 1 may be a one-way pump, and the magnetic refrigeration system further includes a control valve configured to adjust a flow path of the heat exchange fluid at an outlet of the first pump 1 to enable the outlet of the first pump 1 to selectively communicate with the first heat exchanger 2 or the second heat exchanger 4. The first pump 1 adjusts the outlet communication direction by controlling the valve.

The control valve can be formed by combining a plurality of three-way valves and can also be realized by adopting a single two-position four-way valve.

In the present application, the embodiments will be described by taking the first pump 1 as a bidirectional pump as an example.

The evaporative cooling system 6 includes a water tank 61, a second pump 62, and a shower device 63, the second pump 62 being configured to pump water of the water tank 61 to the shower device 63, the shower device 63 being disposed above the first heat exchanger 2, the shower device 63 being configured to shower the first heat exchanger 2.

The water tank 61 is disposed below the first heat exchanger 2, and recovers shower water of the shower device 63.

The evaporative cooling system 6 further comprises an air inlet 65 and an air outlet 66, the first heat exchanger 2 being arranged between the air inlet 65 and the air outlet 66.

The evaporative cooling system 6 further includes a fan 64, an air outlet 66 is disposed above the spraying device 63, an air inlet 65 is disposed corresponding to the bottom of the first heat exchanger 2, and the fan 64 is disposed at the air outlet 66.

The composite refrigeration system of the embodiment comprises three working modes, namely a magnetic refrigeration mode, an evaporative cooling refrigeration mode and a composite refrigeration mode. Three cooling modes are explained below.

(1) Magnetic refrigeration mode

The working principle of the magnetic refrigeration system in the composite refrigeration system is as follows:

based on the magnetocaloric effect, when magnetic field generator adds the magnetic action to the regenerator, the magnetocaloric material in the regenerator can outwards release the heat, and when magnetic field generator demagnetizes the regenerator, the magnetocaloric material in the regenerator can outwards release the cold volume. Magnetic refrigeration system's in this application magnetic field generator adds magnetic action and demagnetization to first regenerator 3 and second regenerator 5 according to predetermined law promptly, and when magnetic field generator adds magnetism to first regenerator 3, its effect to second regenerator 5 is demagnetized, otherwise, when magnetic field generator demagnetizes first regenerator 3, its effect to second regenerator 5 is for adding magnetism. Thus, half of the regenerators in the magnetic refrigeration loop are in the state of magnetizing and generating heat and the other half are in the state of demagnetizing and generating cold at the same time, and the states of the two are periodically switched, so that one cycle of the magnetic refrigeration of the loop can be divided into two stages.

The first stage is as follows: the magnetic field generator demagnetizes the first regenerator 3 and simultaneously magnetizes the second regenerator 5. When the first cold accumulator 3 is demagnetized to generate cold, the heat exchange fluid flows along the direction of the first pump 1, the first heat exchanger 2, the first cold accumulator 3 and the second heat exchanger 4 under the action of the first pump 1, so that the cold in the first cold accumulator 3 can be transmitted to the second heat exchanger 4 by the heat exchange fluid, and then the heat exchange fluid exchanges heat with the air in a refrigeration area through the second heat exchanger 4 to gradually reduce the temperature of the refrigeration area; meanwhile, the second regenerator 5 is magnetized to generate heat, and the heat exchange fluid flows along the direction of the second regenerator 5, the first pump 1 and the first heat exchanger 2 under the driving of the first pump 1, so that the heat exchange fluid can transmit the heat in the second regenerator 5 to the first heat exchanger 2, and then the heat is radiated to a non-refrigeration area through the first heat exchanger 2.

And a second stage: the magnetic field generator magnetizes the first regenerator 3 and demagnetizes the second regenerator 5. When the first regenerator 3 is magnetized to generate heat, the heat exchange fluid flows along the direction of the second heat exchanger 4-the first regenerator 3-the first heat exchanger 2 under the action of the first pump 1, so that the heat exchange fluid can transmit the heat in the first regenerator 3 to the first heat exchanger 2, and then the first heat exchanger 2 exchanges heat with the air in a non-refrigeration area, so that the heat generated by the system can be dissipated to the non-refrigeration area; meanwhile, the second cold accumulator 5 is demagnetized to generate cold energy, the heat exchange fluid flows in the direction of the first pump 1, the second cold accumulator 5 and the second heat exchanger 4 under the driving of the first pump 1, so that the heat exchange fluid can convey the cold energy in the second cold accumulator 5 to the second heat exchanger 4, and then the second heat exchanger 4 exchanges heat with the air in the refrigeration area to gradually reduce the temperature in the refrigeration area.

(2) Evaporative cooling mode

When the evaporative cooling system 6 is started, the second pump 62 starts to operate, the second pump lifts the water in the water tank 61 to the spray device 63 above the first heat exchanger 2 through the pump pressure, the water is sprayed to the first heat exchanger 2 below the first heat exchanger 2 through the spray device 63, the sprayed water falls downwards in the form of water mist or small water drops under the action of gravity, contacts with the outer surface of the first heat exchanger 2 and is attached to the outer surface of the first heat exchanger 2, and after the water drops attached to the outer surface of the first heat exchanger 2 are evaporated, the water drops can absorb heat from the outside due to phase change, so that the temperature of the first heat exchanger 2 is gradually reduced, and the real-time temperature of the heat exchange fluid inside the first heat exchanger 2 is reduced. In order to increase the evaporation rate of the water droplets on the surface of the first heat exchanger 2, a fan 64 is provided above the first heat exchanger 2, which is operated when the evaporative cooling system is started. Under the effect of the fan 64, air can enter from the air inlet 65 arranged below the evaporative cooling system and is discharged from the air outlet 66 of the fan 64 after passing through the first heat exchanger 2, so that the evaporation efficiency of the outer surface of the first heat exchanger 2 is improved in a forced air flowing mode, and the temperature of heat exchange fluid in the first heat exchanger 2 is reduced more quickly. Meanwhile, the first pump 1 is started, and the heat exchange fluid in the magnetic refrigeration system is driven to flow back and forth through the pump pressure, so that the cold energy generated by evaporative cooling is transmitted to the second heat exchanger 4, and the refrigeration area is refrigerated.

The water tank 61 serves to supply the second pump 62 with water and also to receive water dripping from the first heat exchanger 2 above it.

(3) Composite refrigeration mode

The method comprises the steps of firstly starting an evaporative cooling system, after the evaporative cooling system starts to operate, gradually reducing the temperature of a first heat exchanger 2, and simultaneously starting a first pump 1 to drive heat exchange fluid in a magnetic refrigeration system to flow in a reciprocating mode, so that the temperature of the heat exchange fluid can be reduced more quickly. When the temperature of the heat exchange fluid is reduced to the temperature suitable for the working of the magnetocaloric material of the magnetic refrigeration system, the magnetic field generator of the magnetic refrigeration system is started to magnetize and demagnetize the regenerator, the heat exchange fluid transfers the cold energy generated by the magnetic refrigeration to the second heat exchanger 4 under the action of the pump to refrigerate the refrigeration area, transfers the heat generated by the magnetic refrigeration to the first heat exchanger 2, and takes away the heat through evaporative cooling, so that the evaporative cooling is realized to pre-cool the magnetic refrigeration system, the magnetic refrigeration system can work at the suitable working temperature of the magnetocaloric material, and the overall efficiency is optimal; meanwhile, when the evaporative cooling system and the magnetic refrigeration system operate simultaneously, the temperature of the first heat exchanger 2 of the magnetic refrigeration system can be reduced by the evaporative cooling system, so that the magnetic refrigeration system can obtain lower cold end temperature.

In order to enable the composite system to meet the requirements of more efficient automatic temperature control and intelligent refrigeration, a plurality of sensors are arranged in the system to serve as signal input sources of the control system. The temperature sensor for detecting the temperature of the refrigeration area is arranged in the refrigeration area, the real-time temperature value of the refrigeration area is T1, the temperature sensor for detecting the real-time temperature of the heat exchange fluid is arranged in the heat exchange fluid pipeline of the magnetic refrigeration system, and the real-time temperature of the heat exchange fluid is T2. In addition, the system also needs to set the target temperature T3 of the refrigeration area at start-up and to contain in the controller memory the operating temperature range T4-T5 of the magnetocaloric material used.

Referring to fig. 4 in combination, in another embodiment, it is substantially the same as the first embodiment, except that in this embodiment, a first bypass line a1 is arranged outside the first regenerator 3 in parallel, and a first control valve S1 is arranged on the first bypass line; a second bypass pipeline a2 is arranged outside the second regenerator 5 in parallel, and a second control valve S1 is arranged on the second bypass pipeline.

In this embodiment, when the system is in the natural cold source cooling mode, the controller controls the first control valve S1 to connect the first bypass line a1, and the second control valve S2 to connect the second bypass line a2, so that the refrigerant can pass through the first bypass line a1 and the second bypass line a2, thereby reducing the pressure resistance of the system and reducing the power consumption of the system.

Referring to fig. 5 in combination, according to an embodiment of the present application, the control method of the compound refrigeration system includes: acquiring the real-time temperature T1 of a refrigeration area; acquiring a target temperature T3 of a refrigeration area; judging the relation between the | T3-T1| and a; when the absolute value of T3-T1 is more than a, the composite refrigeration system is controlled to operate the composite refrigeration mode; and when the absolute value of T3-T1 is less than or equal to a, controlling the composite refrigeration system to operate in a magnetic refrigeration mode or an evaporative cooling refrigeration mode.

The step of controlling the composite refrigeration system to operate the composite refrigeration mode includes: controlling the operation of the evaporative cooling system 6; acquiring the working temperature range T4-T5 of inlet magnetocaloric materials of the first regenerator 3 and the second regenerator 5 in a demagnetizing state; acquiring the real-time temperature T2 of the heat exchange fluid in the first heat exchanger 2; detecting whether T2 meets T4-T2-T5; if T4 is not satisfied and T2 is not satisfied and T5 is not satisfied, the magnetic refrigeration system is stopped or not started; detecting the real-time temperature T2 of the heat exchange fluid once every time delta T2, and judging again until the real-time temperature T2 of the heat exchange fluid meets the condition that T4 is not less than T2 is not more than T5; if T4 is more than or equal to T2 is more than or equal to T5, starting the magnetic refrigeration system or continuously operating the magnetic refrigeration system; and reading the real-time temperature T2 of the heat exchange fluid every delta T3, and judging whether the real-time temperature T2 of the heat exchange fluid meets the condition that T4 is not less than T2 is not less than T5.

The step of controlling the composite refrigeration system to operate in a magnetic refrigeration mode or an evaporative cooling refrigeration mode comprises the following steps: acquiring the real-time temperature T6 of a non-refrigeration area; judging the relation between T2 and the set temperature b; when the T2 is less than or equal to b, controlling the composite refrigeration system to operate an evaporative cooling refrigeration mode; and when T2 is more than b, controlling the composite refrigeration system to operate in the magnetic refrigeration mode.

The step of controlling the composite refrigeration system to operate in the evaporative cooling refrigeration mode comprises the following steps: controlling the first regenerator 3 and the second regenerator 5 to stop working; controlling the first pump 1 to operate; controlling the second pump 62 to operate, pumping the water in the water tank 61 to a spraying device 63 above the first heat exchanger 2, and spraying the first heat exchanger 2 through the spraying device 63 for evaporative cooling; the heat exchange fluid is made to flow through the first pump 1, the first heat exchanger 2 and the second heat exchanger 4 in sequence to form a flow circulation.

The step of controlling the composite refrigeration system to operate in the evaporative cooling refrigeration mode comprises the following steps: controlling the first regenerator 3 and the second regenerator 5 to stop working; controlling the first bypass pipeline to be communicated with the second bypass pipeline; controlling the first pump 1 to operate; controlling the second pump 62 to operate, pumping the water in the water tank 61 to a spraying device 63 above the first heat exchanger 2, and spraying the first heat exchanger 2 through the spraying device 63 for evaporative cooling; the heat exchange fluid is made to flow through the first pump 1, the first heat exchanger 2 and the second heat exchanger 4 in sequence to form a flow circulation.

The step of controlling the composite refrigeration system to operate in the magnetic refrigeration mode comprises the following steps: controlling the evaporative cooling system 6 to stop working; acquiring the working states of the first regenerator 3 and the second regenerator 5; when the first regenerator 3 is demagnetized and the second regenerator 5 is magnetized, the first pump 1 is controlled to operate; controlling a heat exchange fluid to sequentially flow through a first pump 1, a first heat exchanger 2, a first cold accumulator 3, a second heat exchanger 4 and a second cold accumulator 5 to form a flowing circulation; when the first regenerator 3 is magnetized and the second regenerator 5 is demagnetized, the first pump 1 is controlled to operate; and controlling the heat exchange fluid to sequentially flow through the first pump 1, the second cold accumulator 5, the second heat exchanger 4, the first cold accumulator 3 and the first heat exchanger 2 to form flowing circulation.

After the composite refrigeration system is started, the controller reads the real-time temperature T1 of the refrigeration area obtained from the sensor, and simultaneously reads the target temperature value T3 of the refrigeration area set by a user and the working temperature range T4-T5 of the magnetocaloric material stored in the storage unit in advance. And then the control program judges the operation mode, when the difference value | T3-T1| between the real-time temperature T1 of the refrigeration area and the target temperature T3 of the refrigeration area is larger than a, the controller starts the composite refrigeration mode of the third mode, namely, the evaporative cooling system 6 is operated firstly, the heat exchange fluid in the magnetic refrigeration system is precooled through the evaporative cooling system 6, the pump 1 is started simultaneously, when the real-time temperature T2 of the heat exchange fluid acquired by the controller does not meet the condition that T4 is not less than T2 is not less than T5, the magnetic refrigeration system is stopped or not started, the real-time temperature T2 of the heat exchange fluid is detected once every time delta T2, and the judgment is carried out again until the real-time temperature T2 of the heat exchange fluid meets the condition that T4 is not less than T2 is not less than T5. When the real-time temperature T2 of the heat exchange fluid meets the condition that T4 is not less than T2 is not less than T5, the magnetic refrigeration system is started and operated, and at the moment, the evaporative cooling system 6 and the magnetic refrigeration module operate simultaneously, so that overlapping of the two refrigeration systems is realized. In the process, the controller reads the real-time temperature T2 of the heat exchange fluid every Deltat 3 and judges whether the real-time temperature T2 of the heat exchange fluid meets the condition that T4 is not less than T2 is not less than T5.

After the compound cooling mode is started. And when the controller judges that the difference value | T3-T1| between the real-time temperature T1 of the refrigeration area and the target temperature T3 of the refrigeration area is less than or equal to a, starting a default operation mode preset by a user. And then. The controller returns to the step of obtaining the real-time temperature T1 of the refrigeration area every time delta T1, reads the temperature T1 of the refrigeration area and judges the condition of the relation between the | T3-T1| and a again.

The default operation mode preset by the user is the default operation mode preset by the user at the terminal

The mode of default operation is | T3-T1| > a, the mode is one of an evaporative cooling mode and a magnetic cooling mode, and a user can select and set the mode according to the actual situation.

Specifically, it is determined which of the evaporative cooling mode and the magnetic cooling mode is selected according to the relationship between the real-time temperature T6 of the non-cooling region and the preset temperature b. In the process of selecting the control mode, the real-time temperature T6 of a non-refrigeration area needs to be obtained firstly; then judging the relation between T6 and the set temperature b; when the T6 is less than or equal to b, controlling the composite refrigeration system to operate an evaporative cooling refrigeration mode; when T6 is more than b, the magnetic refrigeration mode of the composite refrigeration system is controlled to operate, so that the composite refrigeration system can select a more appropriate working mode, the effective refrigeration capacity of the system can be ensured, and the energy consumption can be reduced as much as possible.

Through the composite refrigeration system of magnetic refrigeration and evaporative cooling refrigeration and the control method thereof, compared with the prior art, the system has the following advantages:

firstly, the magnetic refrigeration system can be precooled through the evaporative cooling system, so that the real-time temperature of the heat exchange fluid in the magnetic refrigeration system is reduced to a temperature range suitable for the work of the magnetocaloric material, and the problem of low refrigeration efficiency caused by the fact that the temperature of the magnetic refrigeration system is not suitable for the work environment of the magnetocaloric material in the prior art is solved;

secondly, when the heat load is large, a mode of simultaneously operating magnetic refrigeration and evaporative cooling can be adopted to realize large refrigeration capacity;

the mode of reducing the temperature of the hot end of the magnetic refrigeration by using evaporative cooling enables the composite system to realize overlapping of temperature spans, so that the limitation that the lowest temperature of the evaporative cooling cannot be lower than the temperature of a wet bulb is made up, and the problem that the realization difficulty of the large temperature span of the magnetic refrigeration system is high is solved.

Magnetic refrigeration is a green, efficient and safe refrigeration mode, evaporative cooling refrigeration is a low-energy-consumption, green and safe refrigeration mode utilizing a natural cold source, and a more efficient and green system is realized by compounding the magnetic refrigeration and the evaporative cooling.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. The composite refrigeration system is characterized by comprising an evaporative cooling system (6) and a magnetic cooling system, wherein the magnetic cooling system comprises a first pump (1), a first heat exchanger (2), a first cold accumulator (3), a second heat exchanger (4) and a second cold accumulator (5) which are sequentially connected, the evaporative cooling system (6) is configured to perform evaporative cooling on the first heat exchanger (2) so as to adjust the temperature of heat exchange fluid in the first heat exchanger (2), and an outlet of the first pump (1) can be selectively communicated with the first heat exchanger (2) or the second heat exchanger (4).

2. Composite refrigeration system according to claim 1, characterized in that the first pump (1) is a bidirectional pump.

3. The compound refrigeration system according to claim 1, wherein the magnetic refrigeration system further comprises a control valve configured to adjust the flow path of the heat exchange fluid at the outlet of the first pump (1) to enable the outlet of the first pump (1) to selectively communicate with the first heat exchanger (2) or the second heat exchanger (4).

4. The compound refrigeration system according to claim 1, characterized in that the evaporative cooling system (6) comprises a water tank (61), a second pump (62) and a spray device (63), the second pump (62) being configured to pump water from the water tank (61) to the spray device (63), the spray device (63) being arranged above the first heat exchanger (2), the spray device (63) being configured to spray the first heat exchanger (2).

5. Composite refrigeration system according to claim 4, characterized in that the water tank (61) is arranged below the first heat exchanger (2) and recovers the spray water of the spray device (63).

6. The compound refrigeration system as claimed in claim 4, wherein the evaporative cooling system (6) further comprises an air intake (65) and an air exhaust (66), the first heat exchanger (2) being disposed between the air intake (65) and the air exhaust (66).

7. The compound refrigeration system according to claim 6, wherein the evaporative cooling system (6) further comprises a fan (64), the air outlet (66) is disposed above the spray device (63), the air inlet (65) is disposed corresponding to the bottom of the first heat exchanger (2), and the fan (64) is disposed at the air outlet (66).

8. The compound refrigeration system as claimed in claim 1, characterized in that a first bypass pipeline is arranged outside the first regenerator (3) in parallel, and a first control valve is arranged on the first bypass pipeline; and/or a second bypass pipeline is arranged outside the second cold accumulator (5) in parallel, and a second control valve is arranged on the second bypass pipeline.