Heat exchange system, refrigeration device and control method thereof

Abstract

This invention discloses a heat exchange system, a refrigeration device, and a control method thereof. The heat exchange system includes a refrigerant flow path comprising a main refrigerant path, multiple heat exchange branches, and a transfer branch. A compressor and a condenser are located on the main refrigerant path. The heat exchange system has a defrosting mode. In defrosting mode, the compressor's return port is connected to the condenser. Each heat exchange branch is equipped with an evaporator and a throttling element, and each heat exchange branch can be connected to the main refrigerant path. The throttling element on each heat exchange branch is located between the corresponding evaporator and condenser. The transfer branch is located between two heat exchange branches. In the defrosting mode of the heat exchange system, the transfer branch can guide the refrigerant flowing from the output end of the throttling element on one heat exchange branch to the input end of the evaporator on another heat exchange branch, and then back to the compressor after flowing to the condenser. This reduces excessive defrosting of some evaporators, saves energy, and improves the user experience.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a heat exchange system, a refrigeration device, and a control method thereof. Background Technology

[0002] Common refrigeration devices, such as household refrigerators, car refrigerators, and outdoor refrigerators, often have multiple storage compartments that require cooling. Frost can form on the evaporator, affecting the operation of the entire device and necessitating defrosting.

[0003] A common defrosting method is to use electric heating near the evaporator to radiate heat to the evaporator, thereby defrosting it. Of course, in some solutions, a refrigerant counterflow method is also used for defrosting.

[0004] The cooling requirements of each storage compartment are different, and the corresponding evaporator settings will also be different. The degree of frost formation during use will also be different. In some existing counter-current defrosting methods, the evaporators supplying cooling to each of the storage compartments are defrosted at the same time. As a result, some evaporators may be over-defrosted, causing the temperature of some storage compartments to rise too high, wasting energy and affecting the user experience. Summary of the Invention

[0005] The main objective of this invention is to propose a heat exchange system, a refrigeration device, and a control method thereof, which aims to optimize existing refrigeration devices to save energy and improve user experience.

[0006] To achieve the above objectives, the present invention proposes a heat exchange system in which a refrigerant flow path is formed, the refrigerant flow path comprising:

[0007] A refrigerant main circuit is provided, on which a compressor and a condenser are installed. The heat exchange system has a defrosting mode. In the defrosting mode, the return port of the compressor is connected to the condenser.

[0008] Multiple heat exchange branches are provided, each branch is equipped with an evaporator and a throttling element, each branch is connected to the main refrigerant circuit, and the throttling element on each branch is located between the corresponding evaporator and condenser; and,

[0009] A diversion branch is provided between the two heat exchange branches. In the defrosting mode of the heat exchange system, the diversion branch can be used to divert the refrigerant flowing out of the output end of the throttling element on one heat exchange branch to the input end of the evaporator on the other heat exchange branch, and then flow to the condenser and back to the compressor.

[0010] In one embodiment, the plurality of heat exchange branches include a first heat exchange branch and a second heat exchange branch. In the defrosting mode of the heat exchange system, the transfer branch can be used to connect to the output end of the throttling element on the first heat exchange branch and can be used to connect to the input end of the evaporator on the second heat exchange branch.

[0011] The heat exchange system includes a first switching device, which has a first connecting port, a second connecting port and a third connecting port. The first connecting port and the second connecting port are located on the first heat exchange branch. The first connecting port is connected to a throttling element on the first heat exchange branch. The third connecting port is located on the flow transfer branch and is connected to an evaporator on the second heat exchange branch. The first switching device can switch the connection between the first connecting port and one of the second connecting port and the third connecting port.

[0012] In the defrosting mode corresponding to the heat exchange system, the first connection port is connected to the third connection port.

[0013] In one embodiment, the heat exchange system includes a second switching device for switching at least a portion of the heat exchange branches to be connected to the refrigerant main line.

[0014] In one embodiment, at least one of a liquid receiver and a dryer filter is provided on the refrigerant trunk line.

[0015] In one embodiment, the heat exchange system further has a cooling mode in which the exhaust port of the compressor is connected to the condenser.

[0016] The present invention also proposes a refrigeration device, the refrigeration device including a heat exchange system, wherein a refrigerant flow path is formed on the heat exchange system, the refrigerant flow path including:

[0017] A refrigerant main circuit is provided, on which a compressor and a condenser are installed. The heat exchange system has a defrosting mode. In the defrosting mode, the return port of the compressor is connected to the condenser.

[0018] Multiple heat exchange branches are provided, each branch is equipped with an evaporator and a throttling element, each branch is connected to the main refrigerant circuit, and the throttling element on each branch is located between the corresponding evaporator and condenser; and,

[0019] A diversion branch is provided between the two heat exchange branches. In the defrosting mode of the heat exchange system, the diversion branch can be used to divert the refrigerant flowing out of the output end of the throttling element on one heat exchange branch to the input end of the evaporator on the other heat exchange branch, and then flow to the condenser and back to the compressor.

[0020] In one embodiment, the refrigeration device includes one of a household refrigerator, a vehicle refrigerator, or an outdoor refrigerator; and / or,

[0021] The refrigeration device includes a direct-cooling refrigerator.

[0022] In one embodiment, a refrigerator compartment and a freezer compartment are formed inside the refrigerator;

[0023] The plurality of heat exchange branches include a first heat exchange branch and a second heat exchange branch. In the defrosting mode of the heat exchange system, the transfer branch is used to connect to the output end of the throttling element on the first heat exchange branch and to connect to the input end of the evaporator on the second heat exchange branch.

[0024] The evaporator on the first heat exchange branch corresponds to the freezer compartment, and the evaporator on the second heat exchange branch corresponds to the refrigerator compartment.

[0025] The present invention also proposes a control method for a refrigeration device, the control method being based on the refrigeration device, the refrigeration device including a heat exchange system, on which a refrigerant flow path is formed, the refrigerant flow path including:

[0026] A refrigerant main circuit is provided, on which a compressor and a condenser are installed. The heat exchange system has a defrosting mode. In the defrosting mode, the return port of the compressor is connected to the condenser.

[0027] Multiple heat exchange branches are provided, each branch is equipped with an evaporator and a throttling element, each branch is connected to the main refrigerant circuit, and the throttling element on each branch is located between the corresponding evaporator and condenser; and,

[0028] A diversion branch is provided between the two heat exchange branches. In the defrosting mode of the heat exchange system, the diversion branch can be used to divert the refrigerant flowing out of the output end of the throttling element of one heat exchange branch to the input end of the evaporator of the other heat exchange branch, and then flow to the condenser and back to the compressor.

[0029] The control method includes:

[0030] In the defrost mode of the refrigeration device, the actual state parameters of each evaporator are obtained;

[0031] After determining the heat exchange demand state of each evaporator, the energy demand of each evaporator is calculated based on the actual state parameters and target parameters under the corresponding heat exchange state.

[0032] The operating parameters of the compressor are determined based on the energy requirements of each of the evaporators;

[0033] The compressor is controlled to operate according to the operating parameters.

[0034] In one embodiment, the heat exchange demand state of the evaporator includes a defrosting demand state, and in the defrosting demand state, the target parameter includes a defrosting exit parameter;

[0035] The step of calculating the energy requirement of each evaporator based on the actual state parameters and the target parameters includes: calculating the required heat based on the actual state parameters and the defrost exit parameters.

[0036] In one embodiment, under the defrosting requirement state, the actual state parameters of the evaporator include the inlet temperature parameter and the evaporation temperature parameter, the defrosting exit parameter includes the defrosting exit temperature parameter, and the formula for calculating the required heat is:

[0037]

[0038] Where Q1 is the required heat, K is the heat transfer coefficient of the evaporator, S is the area of ​​the evaporator, t1 is the inlet temperature parameter of the evaporator, t2 is the outlet temperature parameter of the evaporator, and t_out is the defrost exit temperature parameter of the evaporator.

[0039] In one embodiment, the heat exchange demand state of the evaporator includes a cooling demand state, and in the cooling demand state, the target parameter includes a cooling demand parameter;

[0040] The step of calculating the energy requirement of each evaporator based on the actual state parameters and the target parameters includes: calculating the required cooling capacity based on the actual state parameters and the cooling demand parameters.

[0041] In one embodiment, under the cooling demand state, the actual state parameters of the evaporator include inlet temperature parameters and evaporation temperature parameters, the cooling demand parameters include outlet temperature target parameters, and the formula for calculating the required cooling capacity is:

[0042]

[0043] Where Q2 is the required cooling capacity, K is the heat transfer coefficient of the evaporator, S is the area of ​​the evaporator, t1 is the inlet temperature parameter of the evaporator, t0 is the evaporation temperature parameter of the evaporator, and t2 is the target outlet temperature parameter of the evaporator.

[0044] In one embodiment, the heat exchange demand state of the evaporator includes a defrosting demand state and a cooling demand state;

[0045] The plurality of heat exchange branches include a first heat exchange branch and a second heat exchange branch. The heat exchange system includes a first switching device. The first switching device forms a first connecting port, a second connecting port and a third connecting port. The first connecting port and the second connecting port are located on the first heat exchange branch. The first connecting port is connected to a throttling element on the first heat exchange branch. The third connecting port is located on the flow transfer branch and is connected to an evaporator on the second heat exchange branch.

[0046] Before calculating the energy requirement of each evaporator based on the actual state parameters and target parameters, the following steps are also included:

[0047] When the first switching device switches the connection between the first connection port and the second connection port, the heat exchange demand state of the evaporator on the first heat exchange branch is determined to be the defrosting demand state, and the heat exchange demand state of the evaporator on the second heat exchange branch is determined to be the defrosting demand state.

[0048] When the first switching device switches the connection between the first connection port and the third connection port, the heat exchange demand state of the evaporator on the first heat exchange branch is determined to be the defrosting demand state, and the heat exchange demand state of the evaporator on the second heat exchange branch is determined to be the cooling demand state.

[0049] In one embodiment, the operating parameters of the compressor include operating power parameters and / or operating time parameters.

[0050] In the defrosting mode of this invention, the diversion branch can be used to guide the refrigerant flowing out of the output end of the throttling element on one heat exchange branch to the input end of the evaporator on another heat exchange branch. After flowing to the condenser, it flows back to the compressor. At this time, the evaporators and throttling elements on the two heat exchange branches are connected in series. The airflow from the compressor's exhaust port defrosts through one of the evaporators, then is throttled and cooled by the throttling element located between the two evaporators, and then evaporates and absorbs heat through the other evaporator. This allows the other evaporator to cool while one evaporator is defrosting, thus meeting the defrosting needs of different evaporators, reducing the occurrence of excessive defrosting of some evaporators, saving energy, and improving the user experience. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the heat exchange system of the refrigeration device provided by the present invention;

[0053] Figure 2 This is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiments of the present invention;

[0054] Figure 3 This is a schematic flowchart of the control method based on a refrigeration device according to the present invention.

[0055] Explanation of icon numbers:

[0056] 100. Refrigeration unit; 1. Refrigerant main circuit; 11. Compressor; 12. Condenser; 2. Heat exchange branch; 2a. First heat exchange branch; 2b. Second heat exchange branch; 21. Evaporator; 22. Throttling element; 3. Flow transfer branch; 4. First switching device; 5. Second switching device; 6. Liquid receiver; 7. Dryer filter.

[0057] The functional features and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0058] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0059] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0060] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0061] Common refrigeration devices, such as household refrigerators, car refrigerators, and outdoor refrigerators, often have multiple storage compartments that require cooling. Frost can form on the evaporator, affecting the operation of the entire device and necessitating defrosting.

[0062] A common defrosting method is to use electric heating near the evaporator to radiate heat to the evaporator, thereby defrosting it. Of course, in some solutions, a refrigerant counterflow method is also used for defrosting.

[0063] The cooling requirements of each storage compartment are different, and the corresponding evaporator settings will also be different. The degree of frost formation during use will also be different. In some existing counter-current defrosting methods, the evaporators supplying cooling to each of the storage compartments are defrosted at the same time. As a result, some evaporators may be over-defrosted, causing the temperature of some storage compartments to rise too high, wasting energy and affecting the user experience.

[0064] In view of this, the present invention proposes a refrigeration device, which includes an optimized heat exchange system, saving energy and improving user experience. Figure 1 This is a schematic diagram of the heat exchange system provided by the present invention.

[0065] Please see Figure 1 The present invention proposes a heat exchange system in which a refrigerant flow path is formed, the refrigerant flow path including a main refrigerant path 1, multiple heat exchange branches 2 and a transfer branch 3.

[0066] A compressor 11 and a condenser 12 are provided on the refrigerant main line 1. The heat exchange system has a defrosting mode. In the defrosting mode, the return port of the compressor 11 is connected to the condenser 12.

[0067] Each heat exchange branch 2 is equipped with an evaporator 21 and a throttling element 22. Each heat exchange branch 2 can be connected to the refrigerant main line 1. The throttling element 22 on each heat exchange branch 2 is located between the corresponding evaporator 21 and condenser 12.

[0068] The diversion branch 3 is located between the two heat exchange branches 2. In the defrosting mode of the heat exchange system, the diversion branch 3 can be used to guide the refrigerant flowing out of the output end of the throttling element 22 on one heat exchange branch 2 to the input end of the evaporator 21 on the other heat exchange branch 2, and then flow to the condenser 12 before returning to the compressor 11.

[0069] In the defrosting mode of the present invention, the diversion branch 3 can be used to guide the refrigerant flowing out of the output end of the throttling element 22 on one heat exchange branch 2 to the input end of the evaporator 21 on another heat exchange branch 2, flow to the condenser 12, and then flow back to the compressor 11. At this time, the evaporators 21 and the throttling element 22 on the two heat exchange branches 2 are connected in series. The airflow flowing out of the exhaust port of the compressor 11 defrosts through one of the evaporators 21, then is throttled and cooled by the throttling element 22 located between the two evaporators 21, and then evaporates and absorbs heat through the other evaporator 21. This allows the other evaporator 21 to cool while one evaporator 21 is defrosting, thus meeting the defrosting needs of different evaporators 21, reducing the occurrence of excessive defrosting of some evaporators 21, saving energy, and improving the user experience.

[0070] It should be noted that the working modes of the refrigeration device 100 include a refrigeration mode and a defrosting mode. In the refrigeration mode, the exhaust port of the compressor 11 is connected to the condenser 12. The refrigerant in the compressor 11 first enters the condenser 12, and then enters each of the heat exchange branches 2. After being throttled and cooled by the throttling element 22 on each of the heat exchange branches 2, it enters the evaporator 21 on each of the heat exchange branches 2. Each of the evaporators 21 evaporates and absorbs heat to radiate cold energy to the outside, thereby achieving refrigeration. After being refrigerated by the refrigerant in the evaporator 21, it flows back to the return port of the compressor 11.

[0071] In defrosting mode, the exhaust port of the compressor 11 is connected to the evaporator 21 on each of the heat exchange branches 2. After the high-temperature and high-pressure refrigerant passes through the evaporator 21, it radiates heat outward. At this time, the frost on the evaporator 21 will be melted, thus achieving defrosting. After the refrigerant defrosts through the evaporator 21, it passes through the throttling element 22 on the heat exchange branch 2 and finally flows into the condenser 12 and back to the return port of the compressor 11.

[0072] In the multiple heat exchange branches 2, the evaporators 21 on the multiple heat exchange branches 2 are in the same mode, for example, in the defrosting mode, each of the evaporators 21 defrosts at the same time; in the cooling mode, each of the evaporators 21 cools at the same time.

[0073] The heat exchange branch 3 can set the heat exchange state of the evaporators 21 on each of the heat exchange branches 2 to be different. For example, one of the evaporators 21 is in defrosting mode, and the other evaporator 21 is in cooling mode.

[0074] It is understood that the number of heat exchange branches 2 is not limited, and can be 1, 2, 3 or more.

[0075] For example, when two heat exchange branches 2 are provided, the heat exchange system can be configured such that both evaporators 21 defrost simultaneously; or both evaporators 21 can be configured to cool simultaneously; or one of the two evaporators 21 can be configured to cool while the other defrosts.

[0076] When three heat exchange branches 2 are provided, one transfer branch 3 can be provided in the heat exchange system, which can be three evaporators 21 defrosting or cooling at the same time; or two of them can defrost at the same time and the other one can cool.

[0077] When four heat exchange branches 2 are provided, one transfer branch 3 can be provided in the heat exchange system. This means that four evaporators 21 can defrost or cool at the same time; or three of them can defrost at the same time and the other one can cool.

[0078] When four heat exchange branches 2 are provided, two of the transfer branches 3 can be provided in the heat exchange system. This means that four evaporators 21 can defrost or cool at the same time; three of them can defrost at the same time and one can cool; or two of them can defrost at the same time and two can cool.

[0079] When the number of heat exchange branches 2 is increased, further details will not be provided.

[0080] It should also be noted that the position of the heat exchange branch 2 connected to the diversion branch 3 is not limited. For example, in the refrigeration device 100, a first heat exchange branch, a second heat exchange branch, a third heat exchange branch, a fourth heat exchange branch, etc., are arranged sequentially in a certain direction. The diversion branch 3 can connect the first heat exchange branch and the second heat exchange branch, or it can connect the first heat exchange branch and the third heat exchange branch, or it can connect the first heat exchange branch and the fourth heat exchange branch; of course, the diversion branch can also connect the second heat exchange branch and the third heat exchange branch, or it can connect the second heat exchange branch and the fourth heat exchange branch; of course, the diversion branch 3 can also connect the third heat exchange branch and the fourth heat exchange branch.

[0081] The transfer branch 3 enables part of the evaporator 21 to cool in defrost mode. In some embodiments, the multiple heat exchange branches 2 include a first heat exchange branch 2a and a second heat exchange branch 2b. In the defrost mode of the heat exchange system, the transfer branch 3 can be connected to the output end of the throttling element 22 on the first heat exchange branch 2a and can be connected to the input end of the evaporator 21 on the second heat exchange branch 2b.

[0082] The heat exchange system includes a first switching device 4, which has a first connection port, a second connection port, and a third connection port. The first connection port and the second connection port are located on the first heat exchange branch 2a. The first connection port is connected to the throttling element 22 on the first heat exchange branch 2a. The third connection port is located on the flow transfer branch 3 and is connected to the evaporator 21 on the second heat exchange branch 2b. The first switching device 4 can switch the connection between the first connection port and one of the second connection port and the third connection port.

[0083] In the defrosting mode corresponding to the heat exchange system, the first connection port is connected to the third connection port.

[0084] The first switching device 4 enables the evaporator 21 on the second heat exchange branch 2b to switch from defrosting state to cooling state, thereby reducing excessive defrosting of the storage compartment corresponding to the second evaporator 21, reducing energy consumption, and improving user experience.

[0085] It is understood that the first switching device 4 can be a multi-way valve, such as a three-way valve or a four-way valve, with multiple connection ports provided on the valve structure. The flow path can be switched by switching the connection of different connection ports.

[0086] Of course, the first switching device 4 can be a combination of multiple valves, such as two shut-off valves, in which a single flow path can be connected when one shut-off valve is open and the other shut-off valve is closed.

[0087] In addition, in order to achieve electronic control, in some embodiments, the first switching device 4 is configured as an electronically controlled switching device, such as a solenoid valve.

[0088] The throttling element 22 is a key component of the heat exchange system. It plays a role in regulating and controlling the refrigerant flow rate and can also reduce the refrigerant pressure, allowing the refrigerant to absorb heat in the evaporator 21, thereby achieving a cooling effect.

[0089] In some embodiments, the throttling element 22 is configured as a capillary tube, which is composed of a very thin copper tube. Its function is to restrict the flow of refrigerant through its extremely small inner diameter, causing the pressure of the refrigerant liquid on the high-pressure side to drop sharply after passing through the capillary tube. The advantages of a capillary tube are its simple structure and low cost.

[0090] Of course, in some other embodiments, the throttling element 22 can also be configured as a thermostatic expansion valve, which is a more complex throttling device that can automatically adjust its opening according to load changes within the evaporator 21 to maintain a constant superheat at the outlet of the evaporator 21. The thermostatic expansion valve can more precisely control the refrigerant flow rate, improve refrigeration efficiency, and has better adaptability to different operating conditions.

[0091] In some other embodiments, the throttling element 22 can also be configured as an electronic expansion valve, which can precisely adjust the valve opening based on information fed back from sensors (such as temperature, pressure, etc.), providing more flexible and efficient flow control. The electronic expansion valve is characterized by its fast response speed and high control precision.

[0092] Additionally, it should be noted that some of the heat exchange branches 2 may not be working, for example, only some of the heat exchange branches 2 may be in operation, and only some of the evaporators 21 may be in operation or defrosting.

[0093] It is understood that the heat exchange system includes a second switching device 5, which is used to switch at least some of the heat exchange branches 2 to be connected to the refrigerant main line 1. That is, according to different needs, some of the heat exchange branches 2 can be selected to work and some of the heat exchange branches 2 can be de-worked, thereby meeting different heat exchange needs.

[0094] The second switching device 5 can be a multi-way valve, such as a three-way valve or a four-way valve. The valve structure has multiple connection ports, and the flow path can be switched by switching the connection of different connection ports.

[0095] Of course, the second switching device 5 can be a combination of multiple valves, such as two shut-off valves, in which a single flow path can be connected when one shut-off valve is open and the other shut-off valve is closed.

[0096] In addition, in order to achieve electronic control, in some embodiments, the second switching device 5 is configured as an electronically controlled switching device, such as a solenoid valve.

[0097] Multiple second switching devices 5 can be provided. For example, in an embodiment where two heat exchange branches 2 are provided, one second switching device 5 can be provided at the connection point of each of the two heat exchange branches 2 and the refrigerant main line 1. In an embodiment where three heat exchange branches 2 are provided, four second switching devices 5 can be provided; in an embodiment where four heat exchange branches 2 are provided, six second switching devices can be provided, and so on.

[0098] In addition, in some embodiments, a liquid receiver 6 is provided on the refrigerant main line 1. The liquid receiver 6 is an important component of the heat exchange system, mainly used to store excess liquid refrigerant, and plays a role in filtering and drying during the refrigerant circulation process.

[0099] The receiver 6 can hold a certain amount of liquid refrigerant to ensure that there is enough refrigerant in the system to maintain normal cooling performance. When the refrigerant flow rate in the system changes, the receiver 6 can absorb excess refrigerant or release additional refrigerant when needed, thereby stabilizing the operation of the system.

[0100] The receiver 6 typically contains a filter screen or filter element to capture and remove solid particles, iron filings, and other impurities from the refrigerant stream. This helps prevent these impurities from entering the compressor 11 or other critical components, thus avoiding damage to the system.

[0101] The receiver 6 contains a desiccant (such as a molecular sieve) to adsorb moisture from the refrigerant. Moisture is very harmful in a refrigeration system because it can cause ice blockage, especially at the throttling element 22, where frozen moisture can hinder the normal flow of refrigerant. Furthermore, moisture can react chemically with the refrigerant to produce acidic substances that corrode system components.

[0102] Furthermore, the refrigerant flow path in the main refrigerant path 1 can be switched by a four-way valve to change the refrigerant flow direction, thereby enabling the condenser 12 to switch and the compressor 11 to connect to the return or exhaust port.

[0103] In some embodiments, a dryer filter 7 is provided on the refrigerant main line 1. The dryer filter 7 is mainly used to remove moisture and impurities from the refrigerant to ensure the normal operation of the system and extend its service life.

[0104] The dryer filter 7 contains a high-efficiency desiccant (such as molecular sieve, silica gel or activated alumina), which can adsorb and fix the moisture in the refrigerant to prevent it from damaging the system.

[0105] The dryer filter 7 is usually equipped with a fine filter screen or filter element inside, which can effectively capture and filter out these impurities and protect the system from contamination.

[0106] The present invention also proposes a refrigeration device 100, which includes a heat exchange system. The heat exchange system includes all the technical features of the above-mentioned technical solutions and also has the technical effects brought about by all the above-mentioned technical features, which will not be described in detail here.

[0107] In some embodiments, the refrigeration device 100 includes a household refrigerator, which is an indispensable appliance in modern homes for storing food and beverages, keeping them fresh, and extending their shelf life. With technological advancements, the design and functionality of household refrigerators are constantly evolving to meet the growing needs of consumers; common types include single-door, double-door, and multi-door refrigerators.

[0108] In some embodiments, the refrigeration device 100 includes a vehicle refrigerator, which is disposed in the vehicle body and integrated with the vehicle body to maintain the freshness of food and beverages during car travel. In some power supply scenarios, the vehicle refrigerator draws power directly from the vehicle body.

[0109] In some embodiments, the refrigeration device 100 includes an outdoor refrigerator, which is a refrigeration device specifically designed for outdoor activities and suitable for various scenarios such as camping, picnics, fishing, hiking, beach vacations, and off-road travel. They typically feature rugged durability, portability, low energy consumption, and multi-power supply support to meet the specific needs of outdoor environments. Outdoor refrigerators provide great convenience for outdoor enthusiasts, allowing people to enjoy fresh food and cool drinks even when far from home.

[0110] In some embodiments, the refrigeration device 100 includes a direct-cooling refrigerator, which is a traditional refrigeration technology that achieves cooling by directly exchanging heat with the air in the refrigerator compartment and freezer compartment through the evaporator 21. The design of the refrigerator is relatively simple and the cost is low.

[0111] In some embodiments, the refrigerator has a refrigerator compartment and a freezer compartment.

[0112] The plurality of heat exchange branches 2 include a first heat exchange branch 2a and a second heat exchange branch 2b. In the defrosting mode of the heat exchange system, the transfer branch 3 is used to connect to the output end of the throttling element 22 on the first heat exchange branch 2a and to connect to the input end of the evaporator 21 on the second heat exchange branch 2b.

[0113] The evaporator 21 on the first heat exchange branch 2a is configured to correspond to the freezer compartment, and the evaporator 21 on the second heat exchange branch 2b is configured to correspond to the refrigerator compartment.

[0114] Inside the refrigerator, the freezer compartment requires a large amount of cold air, typically maintained at -18°C (0°F) or lower. This low temperature effectively inhibits the growth of microorganisms, allowing food to be preserved for a long time without spoiling. It is suitable for storing foods that need to be stored for extended periods, such as meat, fish, frozen vegetables, and frozen desserts.

[0115] Refrigeration compartments require relatively little cooling, typically maintained between 2°C and 4°C (36°F to 40°F). This temperature range slows down food spoilage but cannot completely prevent microbial activity. Therefore, refrigerators are mainly used for short-term preservation of fresh foods such as fruits, vegetables, dairy products, cooked foods, and beverages.

[0116] Therefore, in the refrigerator, the evaporator 21 corresponding to the freezer compartment has a more severe degree of frost buildup, requiring a longer defrosting time, while the evaporator 21 corresponding to the refrigerator compartment has a relatively lighter degree of frost buildup, requiring a relatively shorter defrosting time. Thus, the evaporator 21 corresponding to the freezer compartment is continuously defrosted through the transfer branch 3, while the evaporator 21 corresponding to the refrigerator compartment performs cooling after defrosting is completed, reducing excessive defrosting, saving energy, and improving the customer experience.

[0117] Reference Figure 2 , Figure 2 This is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiments of the present invention;

[0118] like Figure 2 As shown, the control module may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0119] Those skilled in the art will understand that Figure 2 The structure shown does not constitute a limitation on the control module and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0120] like Figure 2 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a control program based on the cooling device 100.

[0121] exist Figure 2 In the control module shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the control module of the present invention can be set in the control module. The control module calls the control program based on the refrigeration device 100 stored in the memory 1005 through the processor 1001 and executes the control method based on the refrigeration device 100 provided in the embodiment of the present invention.

[0122] This invention provides a control method based on a refrigeration device 100, referring to... Figure 3 , Figure 3 This is a flowchart illustrating the first embodiment of the control method based on the refrigeration device 100 of the present invention.

[0123] In this embodiment, the control method based on the refrigeration device 100 includes the following steps:

[0124] Step S10: In the defrost mode of the refrigeration device 100, obtain the actual state parameters of each of the evaporators 21.

[0125] It is understood that the refrigeration device 100 has a refrigeration mode and a defrosting mode. The user can control the refrigeration device 100 to enter the defrosting mode, or the system can automatically enter the defrosting mode according to the usage status, such as after a certain period of use.

[0126] The actual state parameters of the evaporator 21 include the inlet temperature parameter, the outlet temperature parameter, the inlet pressure parameter, the outlet pressure parameter, the material concentration parameter of the refrigerant in the evaporator 21, and the viscosity parameter of the refrigerant in the evaporator 21.

[0127] All of the aforementioned state parameters can be obtained through sensors. For example, by placing a temperature sensor near the inlet of the evaporator 21, the inlet temperature parameter of the evaporator 21 can be obtained; by placing the temperature sensor near the outlet of the evaporator 21, the outlet temperature parameter of the evaporator 21 can be obtained; by placing a pressure sensor at the inlet of the evaporator 21, the inlet pressure parameter of the evaporator 21 can be obtained; by placing a pressure sensor at the outlet of the evaporator 21, the outlet pressure parameter of the evaporator 21 can be obtained, and so on.

[0128] Step S20: After determining the heat exchange demand state of each evaporator 21, calculate the required energy of each evaporator 21 according to the actual state parameters and target parameters under the corresponding heat exchange state.

[0129] It should be understood that the evaporators 21 on the multiple heat exchange branches 2 are in different states, some are in a cooling state and some are in a defrosting state, and the energy required for different states is different.

[0130] For example, when the evaporator 21 is in the defrosting state, it is important to know how to end the defrosting state during the defrosting process. At this time, the defrosting exit parameter is the target parameter. When the defrosting exit parameter meets the requirements, the defrosting process ends.

[0131] Heat is required during the defrosting process, and the heat demand of each evaporator 21 can be calculated using the actual state parameters and the defrosting exit parameters.

[0132] When the evaporator 21 is in a cooling state, the focus is on how to meet the cooling demand during the cooling process. At this time, the cooling demand parameter is the target parameter. When the cooling demand parameter meets the requirements, the cooling process ends.

[0133] During the process of starting and stopping the refrigeration, cooling capacity is required. The required cooling capacity of each evaporator 21 can be calculated using the actual state parameters and the refrigeration demand parameters.

[0134] Step S30: Determine the operating parameters of the compressor 11 based on the energy requirements of each evaporator 21.

[0135] The energy required by each of the evaporators 21 is calculated, and the sum of the energy required by each evaporator is the total energy required by the compressor 11 to perform work.

[0136] In some embodiments, the operating parameters of the compressor 11 include operating power parameters and / or operating time parameters.

[0137] For example, in an embodiment where two heat exchange branches 2 are provided, the energy required by the evaporator 21 on the first heat exchange branch 2a is Q1, and the energy required by the evaporator 21 on the first heat exchange branch 2a is Q2. Then the required effective conversion energy is Qtotal = Q1 + Q2.

[0138] Considering the heat conversion coefficient, the following calculation formula can be obtained: Q1+Q2=P*T*f, where P is the operating power parameter of compressor 11, T is the operating time parameter, and f is the heat conversion coefficient.

[0139] Step S40: Control the compressor 11 to work according to the operating parameters.

[0140] It is understandable that the control system controls the compressor 11 to work according to the operating parameters. Under the condition of a certain total power, different operating power requires different running time, such as running at the first power P1 for T1 hours, or running at the second power P2 for T2 hours, etc.

[0141] It should be noted that in the technical solution of the present invention, in the defrosting mode of the refrigeration device 100, the actual state parameters of each evaporator 21 are obtained. After determining the heat exchange demand state of each evaporator 21, the energy demand of each evaporator 21 is calculated according to the actual state parameters and target parameters under the corresponding heat exchange state. The operating parameters of the compressor 11 are determined according to the energy demand of each evaporator 21. The compressor 11 is controlled to work according to the operating parameters. With this setting, precise control is achieved on the basis of meeting the heat exchange demand of each evaporator 21, saving energy and improving the user experience.

[0142] The present invention also proposes a second embodiment of the control method based on the refrigeration device 100. Based on the first embodiment described above, in this embodiment, the heat exchange demand state of the evaporator 21 includes a defrosting demand state. Under the defrosting demand state, the target parameter includes a defrosting exit parameter. Step S20 includes:

[0143] Step S201: Calculate the required heat based on the actual state parameters and defrost exit parameters.

[0144] In the technical solution of the present invention, a counter-current defrosting method for refrigerant is adopted, that is, defrosting is achieved by directly introducing the refrigerant discharged from the exhaust port of the compressor 11 into the evaporator 21. During the defrosting process, the evaporator 21 needs to absorb heat from the refrigerant. Therefore, the compressor 11 needs to provide heat to defrost the evaporator 21.

[0145] In some embodiments, under the defrosting demand state, the actual state parameters of the evaporator 21 include the inlet temperature parameter and the evaporation temperature parameter, the defrosting exit parameter includes the defrosting exit temperature parameter, and the formula for calculating the required heat is:

[0146]

[0147] Wherein, Q1 is the required heat, K is the heat transfer coefficient of the evaporator 21, S is the area of ​​the evaporator 21, t1 is the inlet temperature parameter of the evaporator 21, t2 is the outlet temperature parameter of the evaporator 21, and t_out is the defrost exit temperature parameter of the evaporator 21.

[0148] It is understood that the area of ​​the evaporator 21 is the outer surface area of ​​the evaporator 21, which is all the surface areas that can exchange heat with the outside.

[0149] The heat transfer coefficient of the evaporator 21 is related to the material used for the evaporator tubes of the evaporator 21.

[0150] The inlet temperature parameter of the evaporator 21 is the temperature parameter at the inlet of the evaporator 21 near the evaporator inlet, which is collected by a temperature sensor. It can be collected on the outer surface of the evaporator 21 or in the refrigerant inserted into the evaporator 21.

[0151] The outlet temperature parameter of the evaporator 21 is the temperature parameter at the outlet of the evaporator 21 near the outlet, which is collected by a temperature sensor. It can be collected on the outer surface of the evaporator 21 or in the refrigerant inserted into the evaporator 21.

[0152] The defrost exit temperature parameter is a set value that can be directly written into the system or set by the user. It is mainly used to match the temperature on the temperature sensor set at the middle position of the evaporator 21. When the actual temperature measured at that position reaches the value of the defrost exit temperature parameter, it means that defrosting is complete and the relevant exit procedure can be executed.

[0153] It should be noted that, in the technical solution of the present invention, the heat demand of the evaporator 21 under the defrosting demand state can be accurately calculated based on the heat transfer coefficient of the evaporator 21, the area of ​​the evaporator 21, the inlet temperature parameter of the evaporator 21, the evaporation temperature parameter of the evaporator 21, and the defrosting exit temperature parameter of the evaporator 21.

[0154] The present invention also proposes a third embodiment of the control method based on the refrigeration device 100. Based on the first embodiment above, in the control method based on the refrigeration device 100 in this embodiment, the heat exchange demand state of the evaporator 21 includes the refrigeration demand state, and in the refrigeration demand state, the target parameter includes the refrigeration demand parameter.

[0155] Step S20 includes:

[0156] Step S202: Calculate the required cooling capacity based on the actual state parameters and cooling demand parameters.

[0157] In the technical solution of the present invention, the evaporator 21 is in a cooling state. The evaporator 21 needs to absorb the cold energy in the refrigerant. Therefore, the compressor 11 needs to provide energy to make the evaporator 21 able to cool.

[0158] In some embodiments, under the cooling demand state, the actual state parameters of the evaporator 21 include inlet temperature parameters and evaporation temperature parameters, the cooling demand parameters include outlet temperature target parameters, and the formula for calculating the required cooling capacity is:

[0159]

[0160] Wherein, Q2 is the required cooling capacity, K is the heat transfer coefficient of the evaporator 21, S is the area of ​​the evaporator 21, t1 is the inlet temperature parameter of the evaporator 21, t0 is the evaporation temperature parameter of the evaporator 21, and t2 is the target outlet temperature parameter of the evaporator 21.

[0161] It is understood that the area of ​​the evaporator 21 is the outer surface area of ​​the evaporator 21, which is all the surface areas that can exchange heat with the outside.

[0162] The heat transfer coefficient of the evaporator 21 is related to the material used in the evaporator 21.

[0163] The inlet temperature parameter of the evaporator 21 is the temperature parameter at the inlet of the evaporator 21 near the evaporator inlet, which is collected by a temperature sensor. It can be collected on the outer surface of the evaporator 21 or in the refrigerant inserted into the evaporator 21.

[0164] The evaporation temperature parameter of the evaporator 21 is related to the type of refrigerant flowing within it. Different refrigerants have different evaporation temperature parameters, which can be directly fixed in the system. Of course, depending on the specific system conditions, the evaporation temperature may vary and can be calculated by comprehensively considering parameters such as the inlet temperature, inlet pressure, outlet temperature, and outlet pressure of the evaporator 21.

[0165] The outlet temperature parameter of the evaporator 21 is the temperature parameter at the outlet of the evaporator 21 near the outlet, which is collected by a temperature sensor. It can be collected on the outer surface of the evaporator 21 or in the refrigerant inserted into the evaporator 21.

[0166] It should be noted that, in the technical solution of the present invention, the required cooling capacity of the evaporator 21 under the cooling demand state can be accurately calculated based on the heat transfer coefficient of the evaporator 21, the area of ​​the evaporator 21, the inlet temperature parameter of the evaporator 21, the evaporation temperature parameter of the evaporator 21, and the target outlet temperature parameter of the evaporator 21.

[0167] The present invention also proposes a fourth embodiment of the control method based on the refrigeration device 100. Based on the first embodiment above, in the control method based on the refrigeration device 100 in this embodiment, the heat exchange demand state of the evaporator 21 includes a defrosting demand state and a cooling demand state.

[0168] The plurality of heat exchange branches 2 include a first heat exchange branch 2a and a second heat exchange branch 2b. The heat exchange system includes a first switching device 4. The first switching device 4 has a first connecting port, a second connecting port and a third connecting port. The first connecting port and the second connecting port are located on the first heat exchange branch 2a. The first connecting port is connected to the throttling element 22 on the first heat exchange branch 2a. The third connecting port is located on the flow transfer branch 3 and is connected to the evaporator 21 on the second heat exchange branch 2b.

[0169] Before step S20, the method further includes:

[0170] Step S501: When the first switching device 4 switches the connection between the first connection port and the second connection port, the heat exchange demand state of the evaporator 21 on the first heat exchange branch 2a is determined to be the defrosting demand state, and the heat exchange demand state of the evaporator 21 on the second heat exchange branch 2b is determined to be the defrosting demand state.

[0171] like Figure 1 As described above, when the first and second connecting ports are connected, the first heat exchange branch 2a is in a conductive state. The refrigerant discharged from the compressor 11 exhaust port flows through the evaporator 21 and the throttling element 22 on the first heat exchange branch 2a, then flows into the condenser 12 and returns to the compressor 11. At this time, the second heat exchange branch 2b is in a conductive state. The refrigerant discharged from the compressor 11 exhaust port flows through the evaporator 21 and the throttling element 22 on the second heat exchange branch 2b, then flows into the condenser 12 and returns to the compressor 11. At this time, the evaporators 21 on both the first heat exchange branch 2a and the second heat exchange branch 2b are determined to be in a defrosting demand state.

[0172] It is understandable that for all the heat exchange branches 2, the evaporators 21 connected in parallel are all determined to be in a defrosting state.

[0173] Step S502: When the first switching device 4 switches the first connection port and the third connection port to be connected, the heat exchange demand state of the evaporator 21 on the first heat exchange branch 2a is determined to be the defrosting demand state, and the heat exchange demand state of the evaporator 21 on the second heat exchange branch 2b is determined to be the cooling demand state.

[0174] Continue reading Figure 1When the first connection port and the third connection port are connected, the refrigerant discharged from the exhaust port of the compressor 11 flows through the evaporator 21 and the throttling element 22 on the first heat exchange branch 2a, then flows into the evaporator 21 and the throttling element 22 on the second heat exchange branch 2b, and then flows into the condenser 12, and finally flows back into the compressor 11. At this time, the evaporators 21 on the first heat exchange branch 2a are all determined to be in the defrosting demand state, and the evaporators 21 on the second heat exchange branch 2b are all determined to be in the cooling demand state.

[0175] It is understandable that, for the multiple heat exchange branches 2, the evaporators 21 that are in series are determined to be in a defrosting state when the refrigerant passes through first, and the evaporators 21 that are passed through later are determined to be in a cooling state when the refrigerant passes through last.

[0176] It should be noted that, for example, in an embodiment where multiple recirculation branches 3 are provided, the number of evaporators 21 in a series loop can be set to 3, and they can be set as a first evaporator 21, a second evaporator 21, and a third evaporator 21 in sequence. The refrigerant first passes through the first evaporator 21 and finally passes through the third evaporator 21. At this time, the first evaporator 21 can be determined to be in a defrosting state, and the second evaporator 21 and the third evaporator 21 can be determined to be in a cooling state; or both the first evaporator 21 and the second evaporator 21 can be determined to be in a defrosting state, and the third evaporator 21 can be determined to be in a cooling state.

[0177] When the number of evaporators 21 in a series loop is set to 4 or more, the embodiment in which the number of evaporators 21 in a series loop is set to 3 can be referred to.

[0178] In addition, the throttling element 22 on the heat exchange branch 2 can be used to achieve throttling or non-throttling by means of short circuit, so as to determine different demand states for different evaporators 21.

[0179] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A heat exchange system for use in a refrigeration device, characterized in that, A refrigerant flow path is formed on the heat exchange system, and the refrigerant flow path includes: A refrigerant main circuit is provided, on which a compressor and a condenser are installed. The heat exchange system has a defrosting mode, in which the return port of the compressor is connected to the condenser. Multiple heat exchange branches are provided, each branch is equipped with an evaporator and a throttling element, each branch is connected to the main refrigerant circuit, and the throttling element on each branch is located between the corresponding evaporator and condenser; and, A diversion branch is provided between the two heat exchange branches. In the defrosting mode of the heat exchange system, the diversion branch can be used to divert the refrigerant flowing out of the output end of the throttling element on one heat exchange branch to the input end of the evaporator on the other heat exchange branch, and then flow to the condenser and back to the compressor.

2. The heat exchange system as described in claim 1, characterized in that, The plurality of heat exchange branches include a first heat exchange branch and a second heat exchange branch. In the defrosting mode of the heat exchange system, the transfer branch can be used to connect to the output end of the throttling element on the first heat exchange branch and can be used to connect to the input end of the evaporator on the second heat exchange branch. The heat exchange system includes a first switching device, which has a first connecting port, a second connecting port and a third connecting port. The first connecting port and the second connecting port are located on the first heat exchange branch. The first connecting port is connected to a throttling element on the first heat exchange branch. The third connecting port is located on the flow transfer branch and is connected to an evaporator on the second heat exchange branch. The first switching device can switch the connection between the first connecting port and one of the second connecting port and the third connecting port. Corresponding to the defrosting mode of the heat exchange system, the first connection port is connected to the third connection port.

3. The heat exchange system as described in claim 1, characterized in that, The heat exchange system includes a second switching device, which is used to switch at least a portion of the heat exchange branches to be connected to the refrigerant main line.

4. The heat exchange system as described in claim 1, characterized in that, At least one of a liquid receiver and a dryer filter is provided on the main refrigerant line.

5. The heat exchange system as described in claim 1, characterized in that, The heat exchange system also has a cooling mode, in which the compressor's exhaust port is connected to the condenser.

6. A refrigeration device, characterized in that, Includes the heat exchange system as described in any one of claims 1 to 5.

7. The refrigeration device as described in claim 6, characterized in that, The refrigeration device includes one of a household refrigerator, a vehicle refrigerator, or an outdoor refrigerator; and / or, The refrigeration device includes a direct-cooling refrigerator.

8. The refrigeration device as described in claim 6, characterized in that, The refrigerator has a refrigerator compartment and a freezer compartment. The plurality of heat exchange branches include a first heat exchange branch and a second heat exchange branch. In the defrosting mode of the heat exchange system, the transfer branch is used to connect to the output end of the throttling element on the first heat exchange branch and to connect to the input end of the evaporator on the second heat exchange branch. The evaporator on the first heat exchange branch corresponds to the freezer compartment, and the evaporator on the second heat exchange branch corresponds to the refrigerator compartment.

9. A control method for a refrigeration device, based on the refrigeration device as described in any one of claims 6 to 8, characterized in that, The control method includes: In the defrost mode of the refrigeration device, the actual state parameters of each evaporator are obtained; After determining the heat exchange demand state of each evaporator, the energy demand of each evaporator is calculated based on the actual state parameters and target parameters under the corresponding heat exchange state. The operating parameters of the compressor are determined based on the energy requirements of each of the evaporators; The compressor is controlled to operate according to the operating parameters.

10. The control method as described in claim 9, characterized in that, The heat exchange demand state of the evaporator includes the defrosting demand state, and the target parameters under the defrosting demand state include the defrosting exit parameters; The step of calculating the energy requirement of each evaporator based on the actual state parameters and the target parameters includes: calculating the required heat based on the actual state parameters and the defrost exit parameters.

11. The control method as described in claim 10, characterized in that, Under the defrosting requirement state, the actual state parameters of the evaporator include the inlet temperature parameter and the evaporation temperature parameter, the defrosting exit parameter includes the defrosting exit temperature parameter, and the formula for calculating the required heat is: Where Q1 is the required heat, K is the heat transfer coefficient of the evaporator, S is the area of ​​the evaporator, t1 is the inlet temperature parameter of the evaporator, t2 is the outlet temperature parameter of the evaporator, and t_out is the defrost exit temperature parameter of the evaporator.

12. The control method as described in claim 9, characterized in that, The heat exchange demand state of the evaporator includes a cooling demand state, and under the cooling demand state, the target parameter includes a cooling demand parameter. The step of calculating the energy requirement of each evaporator based on the actual state parameters and the target parameters includes: calculating the required cooling capacity based on the actual state parameters and the cooling demand parameters.

13. The control method as described in claim 12, characterized in that, Under the stated cooling demand condition, the actual state parameters of the evaporator include the inlet temperature parameter and the evaporation temperature parameter, the cooling demand parameters include the target outlet temperature parameter, and the formula for calculating the required cooling capacity is: Where Q2 is the required cooling capacity, K is the heat transfer coefficient of the evaporator, S is the area of ​​the evaporator, t1 is the inlet temperature parameter of the evaporator, t0 is the evaporation temperature parameter of the evaporator, and t2 is the target outlet temperature parameter of the evaporator.

14. The control method as described in claim 9, characterized in that, The heat exchange demand status of the evaporator includes defrosting demand status and cooling demand status; The plurality of heat exchange branches include a first heat exchange branch and a second heat exchange branch. The heat exchange system includes a first switching device. The first switching device forms a first connecting port, a second connecting port and a third connecting port. The first connecting port and the second connecting port are located on the first heat exchange branch. The first connecting port is connected to a throttling element on the first heat exchange branch. The third connecting port is located on the flow transfer branch and is connected to an evaporator on the second heat exchange branch. Before calculating the energy requirement of each evaporator based on the actual state parameters and target parameters, the following steps are also included: When the first switching device switches the connection between the first connection port and the second connection port, the heat exchange demand state of the evaporator on the first heat exchange branch is determined to be the defrosting demand state, and the heat exchange demand state of the evaporator on the second heat exchange branch is determined to be the defrosting demand state. When the first switching device switches the connection between the first connection port and the third connection port, the heat exchange demand state of the evaporator on the first heat exchange branch is determined to be the defrosting demand state, and the heat exchange demand state of the evaporator on the second heat exchange branch is determined to be the cooling demand state.

15. The control method as described in claim 9, characterized in that, The compressor's operating parameters include operating power parameters and / or operating time parameters.

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