Heat exchange system, refrigeration device and its control method

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 and multiple heat exchange branches. A liquid replenisher and a gas distributor are provided on the heat exchange system. A compressor, a condenser, and a gas-liquid separator are provided on the main refrigerant path. The gas-liquid separator has a bottom liquid outlet, a top gas outlet, and a refrigerant inlet. The refrigerant inlet is connected to the condenser. Each heat exchange branch is equipped with an evaporator and a throttling element. The multiple heat exchange branches include a first heat exchange branch and a second heat exchange branch. The first heat exchange branch is connected to the bottom liquid outlet, and the second heat exchange branch is connected to the top gas outlet. The liquid replenisher is used to replenish the main refrigerant path with liquid first refrigerant. The gas distributor is used to divert and reduce the first refrigerant entering the throttling element on the second heat exchange branch. This separation of the two refrigerants for heat exchange significantly improves ice-making efficiency and enhances 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 ice makers, often use mixed refrigerants in their refrigerant systems. Mixed refrigerants are often used for both refrigeration and ice making, resulting in higher energy consumption and lower refrigeration and ice making efficiency, which affects the user experience. Summary of the Invention

[0003] 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 significantly improve ice-making efficiency and enhance user experience.

[0004] 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:

[0005] A refrigerant main circuit includes a compressor, a condenser, and a gas-liquid separator. The heat exchange system has a cooling mode. In the cooling mode, the compressor's discharge port is connected to the condenser. A first refrigerant and a second refrigerant with different condensation temperatures flow in the refrigerant main circuit. In the gas-liquid separator, the first refrigerant forms a gaseous state, and the second refrigerant forms a liquid state. The gas-liquid separator has a bottom liquid outlet, a top gas outlet, and a refrigerant inlet. The refrigerant inlet is connected to the condenser.

[0006] Multiple heat exchange branches are provided, each of which is equipped with an evaporator and a throttling element. Each of the heat exchange branches can be connected to the return port of the compressor. The multiple heat exchange branches include a first heat exchange branch and a second heat exchange branch. The first heat exchange branch is connected to the bottom liquid outlet, and the second heat exchange branch is connected to the top gas outlet.

[0007] The heat exchange system is also equipped with a liquid replenisher and a gas distributor. The liquid replenisher is used to connect to the main refrigerant circuit and contains a first refrigerant to replenish the main refrigerant circuit in liquid form. The gas distributor is used to divert and reduce the amount of the first refrigerant in gaseous form entering the throttling element in the second heat exchange branch circuit.

[0008] In one embodiment, a first electrically controlled valve and / or a first flow meter are provided on the flow path of the replenishment device connecting to the refrigerant main line; and / or,

[0009] A second electrically controlled valve and / or a second flow meter are provided in the flow path of the gas distributor connecting to the gas-liquid separator.

[0010] In one embodiment, the gas separator is connected to the top of the gas-liquid separator.

[0011] In one embodiment, the heat exchange system is used in an ice maker, wherein:

[0012] The cooling mode of the heat exchange system includes an ice-making mode; and / or,

[0013] The heat exchange system has a de-icing mode, in which the return port of the compressor is connected to the condenser.

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

[0015] 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:

[0016] A refrigerant main circuit includes a compressor, a condenser, and a gas-liquid separator. The heat exchange system has a cooling mode. In the cooling mode, the compressor's discharge port is connected to the condenser. A first refrigerant and a second refrigerant with different condensation temperatures flow in the refrigerant main circuit. In the gas-liquid separator, the first refrigerant forms a gaseous state, and the second refrigerant forms a liquid state. The gas-liquid separator has a bottom liquid outlet, a top gas outlet, and a refrigerant inlet. The refrigerant inlet is connected to the condenser.

[0017] Multiple heat exchange branches are provided, each of which is equipped with an evaporator and a throttling element. Each of the heat exchange branches can be connected to the return port of the compressor. The multiple heat exchange branches include a first heat exchange branch and a second heat exchange branch. The first heat exchange branch is connected to the bottom liquid outlet, and the second heat exchange branch is connected to the top gas outlet.

[0018] The heat exchange system is also equipped with a liquid replenisher and a gas distributor. The liquid replenisher is used to connect to the main refrigerant circuit and contains a first refrigerant to replenish the main refrigerant circuit in liquid form. The gas distributor is used to divert and reduce the amount of the first refrigerant in gaseous form entering the throttling element in the second heat exchange branch circuit.

[0019] In one embodiment, the refrigeration device includes an ice maker.

[0020] In one embodiment, the ice maker includes an ice-making chamber and a water storage chamber, wherein the evaporator on the first heat exchange branch is disposed corresponding to the water storage chamber, and the evaporator on the second heat exchange branch is disposed corresponding to the ice-making chamber.

[0021] 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:

[0022] A refrigerant main circuit includes a compressor, a condenser, and a gas-liquid separator. The heat exchange system has a cooling mode. In the cooling mode, the compressor's discharge port is connected to the condenser. A first refrigerant and a second refrigerant with different condensation temperatures flow in the refrigerant main circuit. In the gas-liquid separator, the first refrigerant forms a gaseous state, and the second refrigerant forms a liquid state. The gas-liquid separator has a bottom liquid outlet, a top gas outlet, and a refrigerant inlet. The refrigerant inlet is connected to the condenser.

[0023] Multiple heat exchange branches are provided, each of which is equipped with an evaporator and a throttling element. Each of the heat exchange branches can be connected to the return port of the compressor. The multiple heat exchange branches include a first heat exchange branch and a second heat exchange branch. The first heat exchange branch is connected to the bottom liquid outlet, and the second heat exchange branch is connected to the top gas outlet.

[0024] The heat exchange system is also equipped with a liquid replenisher and a gas distributor. The liquid replenisher is used to connect to the main refrigerant circuit and contains a first refrigerant to replenish the main refrigerant circuit in liquid form. The gas distributor is used to divert and reduce the amount of gaseous first refrigerant entering the throttling element in the second heat exchange branch circuit.

[0025] The refrigeration device has an ice-making mode. The refrigeration device includes an ice-making chamber. The evaporator on the second heat exchange branch is set in the ice-making chamber. A first electrically controlled valve is provided on the flow path of the liquid replenisher connected to the main refrigerant line. A second electrically controlled valve is provided on the flow path of the gas distributor connected to the gas-liquid separator.

[0026] The control method includes:

[0027] In the ice-making mode of the refrigeration device, the initial water temperature in the ice-making chamber is obtained;

[0028] The target total amount of the first refrigerant in the heat exchange system is determined based on the initial water temperature and the target ice-making temperature.

[0029] After determining the initial amount of the first refrigerant in the heat exchange system, the compensation difference is calculated based on the target total amount and the initial amount.

[0030] The first and / or second solenoid valves are controlled to operate according to the compensation differential.

[0031] In one embodiment, a first flow meter is provided on the flow path of the replenishment device connected to the refrigerant main line;

[0032] The step of controlling the operation of the first solenoid valve and / or the second solenoid valve according to the compensation difference includes:

[0033] When the compensation difference is positive, the total amount of fluid to be replenished is determined based on the compensation difference;

[0034] The first solenoid valve is opened until the flow rate monitored on the first flow meter reaches the total replenishment volume, at which point the first solenoid valve is closed.

[0035] In one embodiment, a second flow meter is provided in the flow path connecting the gas distributor to the gas-liquid separator;

[0036] The step of controlling the operation of the first solenoid valve and / or the second solenoid valve according to the compensation difference includes:

[0037] When the compensation difference is negative, the total liquid volume is determined based on the compensation difference, and the total gas volume is determined based on the total liquid volume.

[0038] The second solenoid valve is opened until the flow rate monitored on the second flow meter reaches the total gas distribution volume, at which point the second solenoid valve is closed.

[0039] In one embodiment, determining the target total amount of the first refrigerant in the heat exchange system based on the initial water temperature and the target ice-making temperature includes:

[0040] The effective cooling capacity of the evaporator in the second heat exchange branch is determined based on the initial water temperature and the target ice-making temperature.

[0041] Calculate the total energy requirement based on the effective cooling capacity;

[0042] The target total amount of the first refrigerant is determined based on the total energy required.

[0043] In one embodiment, in the step of determining the effective cooling capacity of the evaporator in the second heat exchange branch based on the initial water temperature and the target ice-making temperature, the formula for calculating the effective cooling capacity is:

[0044]

[0045] Where Q1 is the effective cooling capacity, in kJ;

[0046] m is the mass of water, in kg;

[0047] c is the specific heat capacity of water, c = 4.19 kJ / (kg·K);

[0048] r is the heat of freezing of water (heat of melting of ice), r = 333 kJ / kg;

[0049] c b c is the specific heat capacity of ice. b = 2kJ / (kg·K);

[0050] t1 is the initial water temperature, in °C;

[0051] t2 is the target ice-making temperature, in °C.

[0052] In one embodiment, calculating the total energy requirement based on the effective cooling capacity includes:

[0053] After determining the first amount of cold leakage through the insulation layer of the ice-making chamber and the second amount of cold leakage through the door of the ice-making chamber, the total energy required is calculated based on the first amount of cold leakage, the second amount of cold leakage, and the effective cooling capacity.

[0054] In one embodiment, determining the target total amount of the first refrigerant based on the total energy demand includes:

[0055] The unit cooling capacity is determined based on the first refrigerant and the first mapping relationship, where the first mapping relationship is the association between the first refrigerant and the unit cooling capacity.

[0056] The target total amount of the first refrigerant is determined based on the unit cooling capacity and the total energy.

[0057] In the technical solution of this invention, a refrigerant flow path is formed on the heat exchange system. The refrigerant flow path includes a main refrigerant path and multiple heat exchange branches. The heat exchange system is also equipped with a liquid replenisher and a gas distributor. A compressor, a condenser, and a gas-liquid separator are provided on the main refrigerant path. The heat exchange system has a cooling mode. In the cooling mode, the exhaust port of the compressor is connected to the condenser. A first refrigerant and a second refrigerant with different condensation temperatures flow on the main refrigerant path. In the gas-liquid separator, the first refrigerant forms a gaseous state, and the second refrigerant forms a liquid state. The gas-liquid separator has a bottom liquid outlet, a top gas outlet, and a refrigerant inlet. The refrigerant inlet is connected to the condenser. Each heat exchange branch is equipped with an evaporator and a throttling element. Each heat exchange branch can be connected to the return gas port of the compressor. The multiple heat exchange branches include a first heat exchange branch and a second heat exchange branch. The heat exchange branch has two components: a first heat exchange branch connected to the bottom liquid outlet and a second heat exchange branch connected to the top gas outlet. A liquid replenisher connects to the main refrigerant circuit and contains a first refrigerant to replenish the main refrigerant circuit in liquid form. A gas distributor reduces the amount of gaseous first refrigerant entering the throttling element in the second heat exchange branch. In ice-making mode, the compressor's exhaust port connects to the condenser. In the gas-liquid separator, the first refrigerant forms a gaseous state, and the second refrigerant forms a liquid state. The gaseous first refrigerant enters the second heat exchange branch, where the evaporator radiates cold energy to make ice. The liquid second refrigerant enters the first heat exchange branch for cooling. This separation and heat exchange of the two refrigerants significantly improves ice-making efficiency and enhances the user experience. Attached Figure Description

[0058] 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.

[0059] Figure 1 This is a schematic diagram of the heat exchange system of the refrigeration device provided by the present invention;

[0060] Figure 2 This is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiments of the present invention;

[0061] Figure 3 This is a schematic flowchart of the control method based on a refrigeration device according to the present invention.

[0062] Explanation of icon numbers:

[0063] 100. Refrigeration unit; 1. Refrigerant main circuit; 11. Compressor; 12. Condenser; 13. Gas-liquid separator; 131. Bottom liquid outlet; 132. Top gas outlet; 133. Refrigerant inlet; 2. Heat exchange branch; 2a. First heat exchange branch; 2b. Second heat exchange branch; 21. Evaporator; 22. Throttling element; 3. Liquid replenisher; 4. Gas distributor; 5. First solenoid valve; 6. Second solenoid valve; 7. Liquid receiver; 8. Dryer filter.

[0064] 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

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Common refrigeration devices, such as ice makers, often use mixed refrigerants in their refrigerant systems. Mixed refrigerants are often used for both refrigeration and ice making, resulting in higher energy consumption and lower refrigeration and ice making efficiency, which affects the user experience.

[0069] In view of this, the present invention proposes a refrigeration device, which includes an optimized heat exchange system, significantly improving ice-making efficiency and enhancing user experience. Figure 1 This is a schematic diagram of the heat exchange system provided by the present invention.

[0070] 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 and multiple heat exchange branches 2, and the heat exchange system is also provided with a liquid replenisher 3 and a gas distributor 4.

[0071] A compressor 11, a condenser 12, and a gas-liquid separator 13 are provided on the refrigerant main circuit 1. The heat exchange system has a cooling mode. In the cooling mode, the exhaust port of the compressor 11 is connected to the condenser 12. A first refrigerant and a second refrigerant with different condensation temperatures flow on the refrigerant main circuit 1. In the gas-liquid separator 13, the first refrigerant forms a gaseous state, and the second refrigerant forms a liquid state. The gas-liquid separator 13 has a bottom liquid outlet 131, a top gas outlet 132, and a refrigerant inlet 133. The refrigerant inlet 133 is connected to the condenser 12.

[0072] Each of the heat exchange branches 2 is equipped with an evaporator 21 and a throttling element 22. Each of the heat exchange branches 2 can be connected to the return gas port of the compressor 11. The multiple heat exchange branches 2 include a first heat exchange branch 2a and a second heat exchange branch 2b. The first heat exchange branch 2a is connected to the bottom liquid outlet 131, and the second heat exchange branch 2b is connected to the top gas outlet 132.

[0073] The replenishing device 3 is used to connect to the refrigerant main circuit 1. The replenishing device 3 contains a first refrigerant, which is used to replenish the refrigerant main circuit 1 in liquid form.

[0074] The gas distributor 4 is used to divert and reduce the gaseous first refrigerant entering the throttling element 22 on the second heat exchange branch 2b.

[0075] In the technical solution of the present invention, in the ice-making mode, the exhaust port of the compressor 11 is connected to the condenser 12. In the gas-liquid separator 13, the first refrigerant forms a gaseous state and the second refrigerant forms a liquid state. The gaseous first refrigerant enters the second heat exchange branch 2b, where the evaporator 21 radiates cold energy to the outside for ice making. The liquid second refrigerant enters the first heat exchange branch 2a for refrigeration. In this way, the two refrigerants are separated for heat exchange, which greatly improves the ice-making efficiency and enhances the user experience.

[0076] It should be noted that, for the second heat exchange branch 2b, the working modes of the refrigeration device 100 include ice-making mode and ice-removing mode. In ice-making 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 the second heat exchange branch 2b. After being throttled and cooled by the throttling element 22 on the second heat exchange branch 2b, it enters the evaporator 21 on the second heat exchange branch 2b. The evaporator 21 evaporates and absorbs heat to radiate cold energy to the outside, thereby realizing ice making. After the refrigerant is cooled by the evaporator 21, it flows back to the return port of the compressor 11.

[0077] In the defrosting mode, the exhaust port of the compressor 11 is connected to the evaporator 21 on the second heat exchange branch 2b. After the high-temperature and high-pressure refrigerant passes through the evaporator 21, it radiates heat outward. At this time, the formed ice block will detach from the ice box, realizing defrosting. After the refrigerant defrosts through the evaporator 21, it passes through the throttling element 22 on the second heat exchange branch 2b and finally flows into the condenser 12 and back to the return port of the compressor 11.

[0078] Regarding the first heat exchange branch 2a, the evaporator 21 on the first heat exchange branch 2a only has a cooling mode. In the cooling 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 the first heat exchange branch 2a. After being throttled and cooled by the throttling element 22 on the first heat exchange branch 2a, it enters the evaporator 21 on the first heat exchange branch 2a. The evaporator 21 evaporates and absorbs heat to radiate cold energy to the outside, thereby achieving cooling. After the refrigerant is cooled by the evaporator 21, it flows back to the return port of the compressor 11.

[0079] It is understood that the number of heat exchange branches 2 is not limited, and can be 1, 2, 3 or more.

[0080] For example, when two heat exchange branches 2 are provided, the heat exchange system can have two evaporators 21 making ice simultaneously; or it can have two evaporators 21 cooling simultaneously.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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 circulated with refrigerant, and only some of the evaporators 21 may be used for refrigeration or ice making.

[0086] It is understood that the heat exchange system includes a first switching device, 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.

[0087] The first switching device 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.

[0088] Of course, the first switching device 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.

[0089] In addition, in order to achieve electronic control, in some embodiments, the first switching device is configured as an electronically controlled switching device, such as a solenoid valve.

[0090] Multiple first switching devices can be provided. For example, in an embodiment where two heat exchange branches 2 are provided, one first switching device can be provided at each connection point between the two heat exchange branches 2 and the refrigerant main line 1. In an embodiment where three heat exchange branches 2 are provided, four first switching devices can be provided; in an embodiment where four heat exchange branches 2 are provided, six first switching devices can be provided, and so on.

[0091] Furthermore, the refrigerant flow path in the main refrigerant path 1 can be switched by a switching device, such as 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.

[0092] It is understandable that the refrigerant on the second heat exchange branch 2b is directly used for ice making. In order to control the cooling capacity more accurately and efficiently, the total amount of the first refrigerant needs to be precisely supplied. When the cooling demand is large, the total amount of the first refrigerant needs to be increased in the heat exchange system, and when the cooling demand decreases, the total amount of the first refrigerant needs to be reduced in the heat exchange system.

[0093] It should be noted that the added first refrigerant is added in liquid form, and in cooling mode or ice-making mode, it needs to be added to the return port side of the compressor 11; the reduced first refrigerant is reduced in gaseous form, and in cooling mode or ice-making mode, a portion of the gaseous first refrigerant needs to be diverted at the top outlet 132 of the gas-liquid separator 13.

[0094] It is understood that the replenishing device 3 is a liquid storage tank containing the first refrigerant. When the first refrigerant needs to be replenished in the flow path of the refrigerant main line 1, the refrigerant can be replenished from the replenishing device 3 into the refrigerant main line 1.

[0095] In some embodiments, the liquid storage tank may be positioned at a higher location, so that gravity can be used to generate pressure to directly replenish the refrigerant to the refrigerant main line 1; or compressed gas may be provided at the top of the liquid replenisher 3 to push the refrigerant in the liquid storage tank to flow to the refrigerant main line 1.

[0096] In some embodiments, a first electrically controlled valve 5 is provided on the flow path of the replenisher 3 connected to the refrigerant main line 1. When the first refrigerant needs to be replenished, the first electrically controlled valve 5 is opened; when the first refrigerant does not need to be replenished, the first electrically controlled valve 5 is closed.

[0097] In order to monitor the amount of the first refrigerant replenished, in some embodiments, a first flow meter is provided on the flow path of the replenisher 3 connected to the refrigerant main line 1, and the first electrically controlled valve 5 is closed when the first refrigerant is replenished to the required amount.

[0098] It is understood that the gas distributor 4 may be connected between the throttling element 22 on the second heat exchange branch 2b and the gas-liquid separator 13, or it may be directly connected to the top of the gas-liquid separator 13.

[0099] The gas distributor 4 is a gas storage tank capable of storing gaseous refrigerant. When it is necessary to split the first refrigerant, which is set in a gaseous state, the gaseous refrigerant can be stored in the gas storage tank.

[0100] In some embodiments, a second electrically controlled valve 6 is provided in the flow path of the gas distributor 4 connecting to the gas-liquid separator 13. When it is necessary to divert the first refrigerant, the second electrically controlled valve 6 is opened; when it is not necessary to divert the first refrigerant, the second electrically controlled valve 6 is closed.

[0101] In order to monitor the amount of the first refrigerant being diverted, in some embodiments, a second flow meter is provided in the flow path of the gas distributor 4 connecting to the gas-liquid separator 13, and the second electrically controlled valve 6 is closed when the first refrigerant is diverted to the required amount.

[0102] It is understood that the first solenoid valve 5 and the second solenoid valve 6 can be electrically operated shut-off valves.

[0103] In addition, in some embodiments, a liquid receiver 7 is provided on the refrigerant main line 1. The liquid receiver 7 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.

[0104] The receiver 7 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 7 can absorb excess refrigerant or release additional refrigerant when needed, thereby stabilizing the operation of the system.

[0105] The receiver 7 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.

[0106] The receiver 7 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.

[0107] In some embodiments, when replenishing the first liquid refrigerant, it may be added into the liquid reservoir 7.

[0108] In some embodiments, a dryer filter 8 is provided on the refrigerant main line 1. The dryer filter 8 is mainly used to remove moisture and impurities from the refrigerant to ensure the normal operation of the system and extend its service life.

[0109] The dryer filter 8 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.

[0110] The dryer filter 8 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.

[0111] Furthermore, it should be noted that the condensation temperatures of the first refrigerant and the second refrigerant are different. Within the gas-liquid separator 13, the first refrigerant is in a gaseous state, and the second refrigerant is in a liquid state, with the two completely separated. In some embodiments, the first refrigerant can be set to R290, and the second refrigerant can be set to R134a or R600a.

[0112] 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.

[0113] In some embodiments, the refrigeration device 100 includes an ice maker, which is a device specifically designed to produce ice and is widely used in homes, businesses, and industries.

[0114] In some embodiments, the ice maker includes an ice-making chamber and a water storage chamber, wherein the evaporator 21 on the first heat exchange branch 2a is disposed corresponding to the water storage chamber, and the evaporator 21 on the second heat exchange branch 2b is disposed corresponding to the ice-making chamber.

[0115] 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;

[0116] like Figure 2As 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] In this embodiment, the refrigeration device 100 has an ice-making mode. The refrigeration device 100 includes an ice-making chamber. The evaporator 21 on the second heat exchange branch 2b is arranged corresponding to the ice-making chamber. A first electrically controlled valve 5 is provided on the flow path of the liquid replenishment device 3 connected to the refrigerant main line 1. A second electrically controlled valve 6 is provided on the flow path of the gas distributor 4 connected to the gas-liquid separator 13. The control method based on the refrigeration device 100 includes the following steps:

[0122] Step S10: In the ice-making mode of the refrigeration device 100, obtain the initial water temperature in the ice-making chamber.

[0123] It is understood that the refrigeration device 100 has an ice-making mode and an ice-removing mode.

[0124] The initial water temperature inside the ice-making chamber is the water temperature at which the ice-making chamber is turned on. This temperature can be obtained directly by placing a temperature sensor inside the ice-making chamber, or by placing a temperature sensor inside the water storage box to monitor the water temperature inside the water storage box.

[0125] In some embodiments, the evaporator 21 on the first heat exchange branch 2a is arranged corresponding to the water storage box, so that the water in the water storage box can absorb cold energy and has a lower temperature.

[0126] Step S20: Determine the target total amount of the first refrigerant in the heat exchange system based on the initial water temperature and the target ice-making temperature.

[0127] It should be understood that the target ice-making temperature can be a value below 0°C, such as -3°C, -4°C, -5°C, or -6°C, etc.

[0128] The amount of cooling capacity can be directly calculated by lowering the water temperature in the ice-making chamber from the initial water temperature to the target ice-making temperature. By corresponding the amount of cooling capacity to the first refrigerant, the target total amount of the first refrigerant can be obtained.

[0129] It is understandable that the target ice-making temperature can be a standard value set by the user, which remains fixed during the operation of the control program and can be directly called by the system; or it can be a value temporarily input by the user.

[0130] Step S30: After determining the initial amount of the first refrigerant in the heat exchange system, calculate the compensation difference based on the target total amount and the initial amount.

[0131] The initial amount of the first refrigerant can be recorded directly when each refrigerant is initially added to the heat exchange system, or it can be determined by counting the total amount of mixed refrigerant on the first heat exchange system, obtaining the concentration parameter of the first refrigerant on the heat exchange system, and determining the initial amount of the first refrigerant based on the concentration parameter and the total amount of mixed refrigerant.

[0132] Step S40: Control the first solenoid valve 5 and / or the second solenoid valve 6 to operate according to the compensation difference.

[0133] It is understandable that after obtaining the compensation difference, either the first control valve is controlled to replenish the liquid or the second control valve is controlled to divert the liquid. This makes it easy to accurately give the total amount of the first refrigerant, and thus accurately control the operation of the entire system.

[0134] In the technical solution of the present invention, in the ice-making mode of the refrigeration device 100, the initial water temperature in the ice-making chamber is obtained, and the target total amount of the first refrigerant in the heat exchange system is determined based on the initial water temperature and the target ice-making temperature. After determining the initial amount of the first refrigerant in the heat exchange system, a compensation difference is calculated based on the target total amount and the initial amount. The first solenoid valve 5 and / or the second solenoid valve 6 are controlled to work based on the compensation difference. In this way, the total amount of the first refrigerant in the heat exchange system is precisely controlled, thereby quickly realizing ice making, improving ice-making efficiency, and improving user experience.

[0135] 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, a first flow meter is provided on the flow path of the liquid replenishment device 3 connected to the refrigerant main line 1. Step S40 includes:

[0136] Step S401: When the compensation difference is positive, determine the total amount of fluid to be replenished based on the compensation difference.

[0137] When the compensation difference is positive, that is, when the target total amount is greater than the initial amount, liquid first refrigerant needs to be added to the refrigerant main circuit 1.

[0138] Step S402: Control the first solenoid valve 5 to open until the flow rate value monitored on the first flow meter reaches the total replenishment amount, then control the first solenoid valve 5 to close.

[0139] After determining the total amount of refrigerant to be replenished, the first control valve is opened to replenish the refrigerant in the main circuit 1. The amount of refrigerant replenished is measured by the first flow meter. When the flow rate monitored by the first flow meter reaches the total amount of refrigerant to be replenished, it indicates that the amount of refrigerant replenished is sufficient. At this time, the first control valve needs to be closed to stop the refrigerant replenishment.

[0140] Of course, in some other embodiments, when the cross-sections of the replenishment flow path are consistent, the opening duration of the first control valve can also be controlled. When the total replenishment amount is the first total replenishment amount, the first total replenishment amount is converted into the first opening duration, that is, after the first opening duration, the first control valve is closed.

[0141] In the technical solution of the present invention, when the compensation difference is positive, the total amount of liquid replenishment is determined according to the compensation difference, and the first solenoid valve 5 is opened. When the flow rate value monitored on the first flow meter reaches the total amount of liquid replenishment, the first solenoid valve 5 is closed. With this setting, the first refrigerant is accurately replenished in the heat exchange system, and the total amount of the first refrigerant is accurately controlled, thereby quickly realizing ice making, improving ice making efficiency, and improving user experience.

[0142] The present invention also proposes a third embodiment of the control method based on the refrigeration device 100. Based on the first embodiment described above, in this embodiment of the control method based on the refrigeration device 100, a second flow meter is provided in the flow path connecting the gas distributor 4 to the gas-liquid separator 13. Step S40 includes:

[0143] Step S401': When the compensation difference is negative, determine the total liquid volume based on the compensation difference, and determine the total gas volume based on the total liquid volume.

[0144] When the compensation difference is negative, that is, when the target total is less than the initial amount, the first refrigerant needs to be diverted into the second heat exchange branch 2b.

[0145] The obtained compensation difference is a value in the liquid state. It is necessary to convert the value in the liquid state to a value in the gas state. That is, the total liquid volume is determined based on the compensation difference, and the total gas volume is determined based on the total liquid volume.

[0146] Step S402': Control the second solenoid valve 6 to open until the flow rate value monitored on the second flow meter reaches the total gas distribution, then control the second solenoid valve 6 to close.

[0147] After determining the total gas volume, the first refrigerant flowing into the second heat exchange branch 2b is diverted by controlling the second control valve to open. The amount of diversion is measured by the second flow meter. When the flow rate monitored by the second flow meter reaches the total gas volume, it indicates that the diversion flow is sufficient. At this time, the second control valve needs to be closed to stop the diversion.

[0148] Of course, in some other embodiments, when the cross-sections of the gas distribution path are consistent, the opening duration of the second control valve can also be controlled. When the total gas distribution is equal to the first total gas distribution, the first total gas distribution is converted into a second opening duration, that is, after the second opening duration, the second control valve is closed.

[0149] In the technical solution of the present invention, when the compensation difference is negative, the total liquid volume is determined according to the compensation difference, the total gas volume is determined according to the total liquid volume, and the second solenoid valve 6 is controlled to open until the flow rate monitored on the second flow meter reaches the total gas volume, at which point the second solenoid valve 6 is controlled to close. This setting enables precise diversion of the first refrigerant in the heat exchange system, achieving precise control of the total amount of the first refrigerant, thereby quickly realizing ice making, improving ice making efficiency, and enhancing user experience.

[0150] The present invention also proposes a fourth embodiment of the control method based on the refrigeration device 100. Based on the first embodiment described above, in this embodiment of the control method based on the refrigeration device 100, step S20 includes:

[0151] Step S201: Determine the effective cooling capacity of the evaporator 21 on the second heat exchange branch 2b based on the initial water temperature and the target ice-making temperature.

[0152] It is understandable that the effective cooling capacity is the cooling capacity used for ice making, and there will be some losses during the cooling capacity transfer process that need to be considered.

[0153] Step S202: Calculate the total energy requirement based on the effective cooling capacity.

[0154] Understandably, only by taking into account the losses can the total energy be fully reflected in the target total amount of the first refrigerant.

[0155] Step S203: Determine the target total amount of the first refrigerant based on the total energy required.

[0156] In the technical solution of the present invention, the effective cooling capacity of the evaporator 21 on the second heat exchange branch 2b is determined according to the initial water temperature and the target ice-making temperature. The total energy required is calculated according to the effective cooling capacity. The target total amount of the first refrigerant is determined according to the total energy required. This setting takes into account the current environmental conditions, realizes the accurate determination of the total amount of the first refrigerant, and improves the user experience.

[0157] In the control method based on the refrigeration device 100 in the fourth embodiment of the present invention, in step S201:

[0158] In the step of determining the effective cooling capacity of the evaporator 21 on the second heat exchange branch 2b based on the initial water temperature and the target ice-making temperature, the formula for calculating the effective cooling capacity is:

[0159]

[0160] Where Q1 is the effective cooling capacity, in kJ;

[0161] m is the mass of water, in kg;

[0162] c is the specific heat capacity of water, c = 4.19 kJ / (kg·K);

[0163] r is the heat of freezing of water (heat of melting of ice), r = 333 kJ / kg;

[0164] c b c is the specific heat capacity of ice. b = 2kJ / (kg·K);

[0165] t1 is the initial water temperature, in °C;

[0166] t2 is the target ice-making temperature, in °C.

[0167] It is understandable that the mass of the water can be set to a certain fixed value, such as a fixed value of water added to the ice-making chamber each time ice is made, and this fixed value can be fixed in the system. In some embodiments, a weighing sensor can be used to obtain the mass of the water in the ice-making chamber, such as the difference between the mass before adding water and the total mass after adding water is the mass of the water. In other embodiments, a liquid level sensor can be used to obtain the liquid level of the water in the ice-making chamber, and the volume of water can be calculated by using the liquid level and the cross-sectional area of ​​the ice-making chamber, and the mass of water can be obtained by converting the volume of water.

[0168] In the technical solution of the present invention, the effective cooling capacity of the evaporator 21 on the second heat exchange branch 2b can be accurately determined by the above formula, thereby realizing the accurate determination of the total amount of the first refrigerant and improving the user experience.

[0169] The present invention also proposes a fifth embodiment of the control method based on the refrigeration device 100. Based on the fourth embodiment above, in the control method based on the refrigeration device 100 in this embodiment, step S201 includes:

[0170] After determining the first amount of cold leakage through the insulation layer of the ice-making chamber and the second amount of cold leakage through the door of the ice-making chamber, the total energy required is calculated based on the first amount of cold leakage, the second amount of cold leakage, and the effective cooling capacity.

[0171] It is understood that the initial amount of cold leakage through the insulation layer of the ice-making chamber can be obtained using the following formula:

[0172]

[0173] Where Q2 is the first leakage of cold air, in kJ;

[0174] α1 is the surface heat transfer coefficient from outside air to the outer surface of the chamber, with units of W / (m²). 2 ·K);

[0175] α2 is the surface heat transfer coefficient from the inner wall surface to the air inside the box, with units of W / (m²). 2 ·K);

[0176] δ represents the thickness of the insulation layer, in meters (m).

[0177] λ is the thermal conductivity of the insulation material, in units of W / (m·K);

[0178] A represents the outer surface area of ​​the box, in meters. 2 ;

[0179] t1' is the temperature outside the ice-making room, in °C;

[0180] t2' is the temperature inside the ice-making chamber, in °C;

[0181] T 时长 The ice-making time in the current ice-making mode can be obtained based on experience, such as 15 minutes when the target ice-making temperature reaches -5℃, and 10 minutes when the target ice-making temperature reaches -3℃; or it can be determined based on the working status of the compressor 11 and the effective cooling capacity.

[0182] The second cold leakage from the door of the ice-making chamber can be calculated based on empirical values, taking 15% of Q2, which is Q3 = Q2 * 0.15.

[0183] In addition, the heat leakage when the door is opened must be considered. For safety reasons, a margin of 10 to 15% is generally added, that is, the design is based on a heat load of 1.1 to 1.15Q.

[0184] That is, Q_total = 1.15 * (Q1 + Q2 + Q3).

[0185] In the technical solution of the present invention, the first amount of cold leakage from the insulation layer of the ice-making chamber can be accurately determined by the above formula, thereby realizing the accurate determination of the total amount of the first refrigerant and improving the user experience.

[0186] The present invention also proposes a sixth embodiment of a control method based on a refrigeration device 100. Based on the fourth embodiment described above, in this embodiment of the control method based on a refrigeration device 100, step S203 includes:

[0187] Step S2031: Determine the unit cooling capacity based on the first refrigerant and the first mapping relationship, wherein the first mapping relationship is the association between the first refrigerant and the unit cooling capacity.

[0188] It is understandable that the first mapping relationship can be obtained from thermodynamic property tables, thermodynamic property diagrams, etc. This mapping relationship can be directly given at the initial stage of system establishment.

[0189] The following explanation uses the evaporation temperature of the first refrigerant as an example: -25°C and the condensation temperature as an example: (See the table below)

[0190] Parameter list symbol unit Parameter source value Specific enthalpy of saturated vapor at 21°C from ice-making evaporator <![CDATA[h1]]> kJ / kg <![CDATA[t0 = -25°C, check the thermodynamic property table]]> 383.45 Specific enthalpy of liquid before capillary throttling (17℃) <![CDATA[h3′]]> kJ / kg <![CDATA[t k =52℃ (Refer to the thermodynamic property diagram) 223.38 Ice evaporator 21 inlet refrigerant specific enthalpy <![CDATA[h4]]> kJ / kg <![CDATA[h4=h3]]> 223.38

[0191] The unit cooling capacity q0 = h1 - h4, in kJ / k.

[0192] Step S2032: Determine the target total amount of the first refrigerant based on the unit cooling capacity and the total energy.

[0193] It can be obtained by calculation using the formula:

[0194]

[0195] Among them, G a This represents the target total amount of the first refrigerant.

[0196] In the technical solution of the present invention, the unit cooling capacity is determined according to the first refrigerant and the first mapping relationship, wherein the first mapping relationship is the correlation between the first refrigerant and the unit cooling capacity. The target total amount of the first refrigerant is determined according to the unit cooling capacity and the total energy, thereby achieving accurate determination of the total amount of the first refrigerant and improving the user experience.

[0197] 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 includes a compressor, a condenser, and a gas-liquid separator. The heat exchange system has a cooling mode. In the cooling mode, the compressor's discharge port is connected to the condenser. A first refrigerant and a second refrigerant with different condensation temperatures flow in the refrigerant main circuit. In the gas-liquid separator, the first refrigerant forms a gaseous state, and the second refrigerant forms a liquid state. The gas-liquid separator has a bottom liquid outlet, a top gas outlet, and a refrigerant inlet. The refrigerant inlet is connected to the condenser. Multiple heat exchange branches are provided, each of which is equipped with an evaporator and a throttling element. Each of the heat exchange branches can be connected to the return port of the compressor. The multiple heat exchange branches include a first heat exchange branch and a second heat exchange branch. The first heat exchange branch is connected to the bottom liquid outlet, and the second heat exchange branch is connected to the top gas outlet. The heat exchange system is also equipped with a liquid replenisher and a gas distributor. The liquid replenisher is used to connect to the main refrigerant circuit and contains a first refrigerant to replenish the main refrigerant circuit in liquid form. The gas distributor is used to divert and reduce the amount of the first refrigerant in gaseous form entering the throttling element in the second heat exchange branch circuit.

2. The heat exchange system as described in claim 1, characterized in that, A first electrically controlled valve and / or a first flow meter are provided on the flow path of the replenishment device connected to the main refrigerant line; and / or, A second electrically controlled valve and / or a second flow meter are provided in the flow path of the gas distributor connecting to the gas-liquid separator.

3. The heat exchange system as described in claim 1, characterized in that, The gas separator is connected to the top of the gas-liquid separator.

4. The heat exchange system as described in claim 1, characterized in that, The heat exchange system is used in an ice maker, wherein: The cooling mode of the heat exchange system includes an ice-making mode; and / or, The heat exchange system has a de-icing mode, in which the return port of the compressor is connected to the condenser.

5. The heat exchange system as described in claim 1, characterized in that, The refrigerant trunk line is equipped with at least one of the following: a liquid receiver, a switching device, and a dryer filter.

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 an ice maker.

8. The refrigeration device as described in claim 7, characterized in that, The ice maker includes an ice-making chamber and a water storage chamber, wherein the evaporator on the first heat exchange branch is arranged corresponding to the water storage chamber, and the evaporator on the second heat exchange branch is arranged corresponding to the ice-making chamber.

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 refrigeration device has an ice-making mode. The refrigeration device includes an ice-making chamber. The evaporator on the second heat exchange branch is set in the ice-making chamber. A first electrically controlled valve is provided on the flow path of the liquid replenisher connected to the main refrigerant line. A second electrically controlled valve is provided on the flow path of the gas distributor connected to the gas-liquid separator. The control method includes: In the ice-making mode of the refrigeration device, the initial water temperature in the ice-making chamber is obtained; The target total amount of the first refrigerant in the heat exchange system is determined based on the initial water temperature and the target ice-making temperature. After determining the initial amount of the first refrigerant in the heat exchange system, the compensation difference is calculated based on the target total amount and the initial amount. The first and / or second solenoid valves are controlled to operate according to the compensation differential.

10. The control method as described in claim 9, characterized in that, A first flow meter is provided on the flow path of the replenishment device connected to the refrigerant main line; The step of controlling the operation of the first solenoid valve and / or the second solenoid valve according to the compensation difference includes: When the compensation difference is positive, the total amount of fluid to be replenished is determined based on the compensation difference; The first solenoid valve is opened until the flow rate monitored on the first flow meter reaches the total replenishment volume, at which point the first solenoid valve is closed.

11. The control method as described in claim 9, characterized in that, A second flow meter is provided in the flow path of the gas separator connecting the gas-liquid separator; The step of controlling the operation of the first solenoid valve and / or the second solenoid valve according to the compensation difference includes: When the compensation difference is negative, the total liquid volume is determined based on the compensation difference, and the total gas volume is determined based on the total liquid volume. The second solenoid valve is opened until the flow rate monitored on the second flow meter reaches the total gas distribution volume, at which point the second solenoid valve is closed.

12. The control method as described in claim 9, characterized in that, Determining the target total amount of the first refrigerant in the heat exchange system based on the initial water temperature and the target ice-making temperature includes: The effective cooling capacity of the evaporator in the second heat exchange branch is determined based on the initial water temperature and the target ice-making temperature. Calculate the total energy requirement based on the effective cooling capacity; The target total amount of the first refrigerant is determined based on the total energy required.

13. The control method as described in claim 12, characterized in that, In the step of determining the effective cooling capacity of the evaporator in the second heat exchange branch based on the initial water temperature and the target ice-making temperature, the formula for calculating the effective cooling capacity is: Where Q1 is the effective cooling capacity, in kJ; m is the mass of water, in kg; c is the specific heat capacity of water, c = 4.19 kJ / (kg·K); r is the heat of condensation of water, r = 333 kJ / kg; c b c is the specific heat capacity of ice. b = 2kJ / (kg·K); t1 is the initial water temperature, in °C; t2 is the target ice-making temperature, in °C.

14. The control method as described in claim 12, characterized in that, The calculation of total energy demand based on the effective cooling capacity includes: After determining the first amount of cold leakage through the insulation layer of the ice-making chamber and the second amount of cold leakage through the door of the ice-making chamber, the total energy required is calculated based on the first amount of cold leakage, the second amount of cold leakage, and the effective cooling capacity.

15. The control method as described in claim 12, characterized in that, Determining the target total amount of the first refrigerant based on the total energy demand includes: The unit cooling capacity is determined based on the first refrigerant and the first mapping relationship, where the first mapping relationship is the association between the first refrigerant and the unit cooling capacity. The target total amount of the first refrigerant is determined based on the unit cooling capacity and the total energy.

Images