A refrigerator energy-saving control method, system and computer readable storage medium

Abstract

The present disclosure provides a refrigerator energy-saving control method, system and computer readable storage medium. In the present disclosure, the highest energy-saving set temperature is calculated according to the key operating parameters of the refrigerator in the energy-saving mode and the predefined maximum temperature recovery time. The key operating parameters include the refrigerator load, and the highest energy-saving set temperature obtained under different refrigerator loads is also different. The highest energy-saving set temperature is calculated under the limitation of the maximum temperature recovery time, and a temperature limit range is determined according to the highest energy-saving set temperature and the normal set temperature, so that the energy-saving set temperature can meet the relevant standard requirements of the temperature recovery time no matter how it is adjusted within the range. Finally, the optimal energy-saving set temperature is calculated within the temperature limit range, which can ensure product compliance while achieving the optimal energy-saving effect.

Description

Technical Field

[0001] This disclosure relates to the field of freezer technology, and in particular to a freezer energy-saving control method, system and computer-readable storage medium. Background Technology

[0002] With the development of the refrigeration industry, freezers need to meet not only basic refrigeration requirements but also energy-saving requirements. Current freezers' energy-saving (ECO) mode generally employs a relatively static control strategy: during inactive periods, the set temperature is simply increased by a fixed value. Relevant industry standards have clear upper limits on the pull-down time for freezers to return to normal operating temperature from energy-saving mode. However, this static control strategy, if the set temperature is set too high, may cause the pull-down time to exceed the standard limit, resulting in product non-compliance risks. Furthermore, the freezer load (i.e., the mass of the stored items) is a key variable affecting its thermodynamic behavior; this static control strategy completely ignores changes in the freezer load, making it impossible to guarantee both energy-saving performance and compliance. Summary of the Invention

[0003] This disclosure provides a method, system, and computer-readable storage medium for energy-saving control of a freezer, which can achieve optimal energy-saving performance while ensuring product compliance.

[0004] The technical solution disclosed herein is implemented as follows:

[0005] In a first aspect, this disclosure provides an energy-saving control method for a freezer, the method comprising:

[0006] Calculate the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheat time.

[0007] The temperature limit range is determined based on the highest energy-saving setting temperature and the normal setting temperature.

[0008] Within the temperature limit, the optimal energy-saving setting temperature is calculated;

[0009] Among them, the maximum energy-saving setting temperature is the highest cabinet temperature that can be set in energy-saving mode; the normal setting temperature is the cabinet temperature set in normal mode; and the energy-saving setting temperature is the cabinet temperature set in energy-saving mode.

[0010] Key operating parameters include the load on the freezer.

[0011] Secondly, this disclosure provides an energy-saving control system for a freezer, the system including a controller;

[0012] The controller is configured as follows:

[0013] Calculate the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheat time.

[0014] The temperature limit range is determined based on the highest energy-saving setting temperature and the normal setting temperature.

[0015] Within the temperature limit, the optimal energy-saving setting temperature is calculated;

[0016] Among them, the maximum energy-saving setting temperature is the highest cabinet temperature that can be set in energy-saving mode; the normal setting temperature is the cabinet temperature set in normal mode; and the energy-saving setting temperature is the cabinet temperature set in energy-saving mode.

[0017] Key operating parameters include the load on the freezer.

[0018] Thirdly, this disclosure provides a computer-readable storage medium storing at least one instruction, which is executed by a processor to implement the above-described energy-saving control method for a freezer.

[0019] Fourthly, this disclosure provides a freezer, which includes the aforementioned freezer energy-saving control system.

[0020] This disclosure provides a method, system, and computer-readable storage medium for energy-saving control of a freezer. In this disclosure, the maximum energy-saving set temperature is calculated based on key operating parameters of the freezer in energy-saving mode and a predefined maximum reheat time. Key operating parameters include the freezer load, and the calculated maximum energy-saving set temperature varies under different freezer loads. The maximum energy-saving set temperature is calculated within the constraint of the maximum reheat time, and a temperature range is determined based on the maximum energy-saving set temperature and the normal set temperature. This range ensures that the energy-saving set temperature, regardless of adjustments, meets the relevant standard requirements for reheat time. Finally, within the temperature range, the optimal energy-saving set temperature is calculated, achieving optimal energy-saving performance while ensuring product compliance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the components of the freezer provided in this disclosure.

[0022] Figure 2 This is a flowchart of the freezer control method provided in this disclosure.

[0023] Figure 3 The flowchart for obtaining the maximum energy-saving set temperature provided in this disclosure.

[0024] Figure 4 A flowchart for obtaining the optimal energy-saving set temperature provided in this disclosure. Detailed Implementation

[0025] The technical solutions in this disclosure will now be clearly and completely described with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram illustrating the composition of an exemplary freezer 100 disclosed herein. Figure 1 In the refrigerator 100, there are a main body 110 with a front opening, a compartment 120 formed in the main body 110 for storing items, a door 130 for opening or closing the front opening of the main body 110, and a refrigeration system 140 for cooling the temperature inside the compartment 120.

[0027] The main body 110 defines the appearance of the freezer 100. Exemplarily, the main body 110 includes an inner shell 112 for forming a compartment and an outer shell 114 coupled to the outside of the inner shell 112. Insulating material is filled between the inner shell 112 and the outer shell 114 to prevent cold air from leaking from the compartment 120.

[0028] For example, compartment 120 can be implemented as a refrigerator compartment for storing items in a refrigerated state, storing items at a temperature above zero degrees Celsius. For instance, in a refrigerated state, the temperature of compartment 120 can be maintained in a temperature range of approximately 1 to 5 degrees Celsius. Furthermore, compartment 120 can also be implemented as a freezer compartment for storing items in a frozen state, storing items at a temperature below zero degrees Celsius. For instance, in a frozen state, the temperature of compartment 120 can be maintained in a temperature range of approximately -13 to -20 degrees Celsius.

[0029] The compartment 120 can be opened or closed through the door 130. After the door 130 is closed, when the temperature inside the compartment 120, which is implemented as a refrigerator compartment, is higher than the temperature range corresponding to the refrigeration state, or when the temperature inside the compartment 120, which is implemented as a freezer compartment, is higher than the temperature range corresponding to the freezing state, the refrigeration system 140 will be activated to lower the temperature inside the compartment 120.

[0030] For example, the refrigeration system 140 includes a compressor 142, a condenser 144, an expansion valve 146, and an evaporator 148. Specifically, the compressor 142 and the condenser 144 may be arranged in a machine compartment at the lower rear of the main body 110. The expansion valve 146 and the evaporator 148 may be disposed in pipes within the internal space of the main body 110.

[0031] For example, in conjunction with the components included in the refrigeration system 140 described above, the refrigeration system 140 operates in the following modes during the process of reducing the temperature within the compartment 120 to a temperature range corresponding to the refrigeration or freezing state (i.e., the refrigeration process):

[0032] First, the compressor 142 compresses the low-pressure gaseous refrigerant to form a high-pressure gaseous refrigerant, and then transmits the high-pressure gaseous refrigerant to the condenser 144 through the refrigerant pipeline 135 under high pressure.

[0033] Subsequently, the high-pressure gaseous refrigerant is condensed into a high-pressure liquid refrigerant through condenser 144, and during this condensation process, the refrigerant releases latent heat. In some examples, condenser 144 is heated by the latent heat released from the refrigerant; therefore, a condenser fan 143 can be configured to exhaust the released latent heat to the external environment of the freezer 100 to cool condenser 144.

[0034] Next, the expansion valve 146 reduces the pressure of the high-pressure liquid refrigerant, and the expansion valve 146 can also adjust the amount of refrigerant so that the refrigerant can absorb sufficient heat energy from the evaporator 148. In some examples, the expansion valve 146 can be implemented as an electronic expansion valve, in which case the open or closed state of the expansion valve 146, as well as the degree of opening (simply referred to as the opening degree), can be adjusted.

[0035] Finally, the evaporator 148 evaporates the depressurized liquid refrigerant, and during the evaporation process, the refrigerant absorbs latent heat from the evaporator 148 to cool the air surrounding the evaporator 148. In some examples, the freezer 100 also includes an evaporator fan 149, which directs the air cooled by the evaporator 148 through the air outlet 170 into the compartment 120 to lower the temperature inside the compartment 120, and returns the flowing air to the vicinity of the evaporator 148 through the return air outlet 180.

[0036] The low-pressure gaseous refrigerant after evaporation returns to compressor 142, thus repeating the above refrigeration cycle. In some examples, the pressure generated by compressor 142 causes the refrigerant to circulate within refrigerant line 135 along condenser 144, expansion valve 146, and evaporator 148.

[0037] Figure 1 The energy-saving mode of the freezer shown typically involves simply raising the setpoint (sp) of the freezer by a fixed value during periods of low activity. While this reduces energy consumption in energy-saving mode, exiting the mode may require more energy to lower the internal temperature to the set point. If the energy saved during energy-saving mode is less than the additional energy consumed to lower the temperature after exiting the mode, then this energy-saving mode may be energy-intensive.

[0038] Figure 2 This is a flowchart of the energy-saving control method for freezers provided in this disclosure. Figure 2 As shown, the method includes:

[0039] Step 201: Calculate the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheat time.

[0040] In this embodiment, the freezer's operating modes can be divided into energy-saving mode and normal mode. Energy-saving mode includes a heating phase and a temperature holding phase. The heating phase refers to the stage where the internal temperature rises from the normal set temperature sp to the energy-saving set temperature sp.d, where the normal set temperature sp is the internal temperature set in normal mode, and the energy-saving set temperature sp.d is the internal temperature set in energy-saving mode. The temperature holding phase refers to the stage where the internal temperature is maintained at the energy-saving set temperature sp.d after the heating phase ends. The time corresponding to the entire energy-saving mode operation phase is denoted as duration t, the time corresponding to the heating phase is denoted as heating time t1, and the time corresponding to the temperature holding phase is denoted as t-t1. The duration t can be set according to requirements. min ≤t≤t max . t min and t max These are the shortest and longest durations that can be set in energy-saving mode, read from the parameter adjustment range set by the freezer thermostat.

[0041] The normal mode includes a warm-up phase, which refers to the period after the energy-saving mode ends when the internal temperature of the refrigerator drops from the energy-saving set temperature to the normal set temperature. The time corresponding to the warm-up phase is recorded as the warm-up time t2. Where 0 < t2 ≤ t0, t0 is the predefined maximum warm-up time, which is generally related to the refrigerator load and ambient temperature and is read from the relevant mapping table.

[0042] The key operating parameters in this embodiment include the freezer load m, which is read from the freezer's built-in load sensor and reflects the freezer's loading capacity.

[0043] Optionally, key operating parameters may also include: compressor cooling capacity q, specific heat capacity c, heat exchange area A, and ambient temperature T2. In this embodiment, for a fixed-frequency compressor, the compressor cooling capacity q can be obtained from a pre-stored data table using the ambient temperature outside the freezer as an index. Generally, the higher the ambient temperature, the lower the compressor cooling capacity. Specific heat capacity c refers to the specific heat capacity of the object stored inside the freezer. Heat exchange area A is the actual heat exchange area between the freezer and the outside environment; under otherwise identical conditions, a larger heat exchange area results in more cold leakage. Ambient temperature T2 reflects the ambient temperature outside the freezer and is read from a temperature sensor located outside the freezer. T2 is generally higher than the internal temperature T1, the normal set temperature sp, and the energy-saving set temperature sp.d. Internal temperature T1 reflects the overall temperature inside the freezer and is read from a temperature sensor located inside the freezer.

[0044] In this embodiment, the highest energy-saving set temperature is calculated using the aforementioned key operating parameters and the predefined maximum reheat time t0, denoted as sp.d. max The highest energy-saving setting temperature is sp.d. max This is the highest cabinet temperature that can be set in energy-saving mode.

[0045] Step 202: Determine the temperature limit range based on the highest energy-saving setting temperature and the normal setting temperature.

[0046] Under normal circumstances, the energy-saving setting temperature sp.d is greater than or equal to the set temperature sp, and less than or equal to the maximum energy-saving setting temperature sp.d. max Therefore, the temperature limit range for the energy-saving setting temperature (sp.d) is... .

[0047] Step 203: Within the temperature limit range, calculate and obtain the optimal energy-saving setting temperature;

[0048] The purpose of this embodiment is to ensure that, within the temperature limit range, both during energy-saving mode operation and during normal mode operation. The energy-saving setting temperature (sp.d) with the lowest energy loss is selected as the optimal energy-saving setting temperature.

[0049] In this embodiment, the maximum energy-saving set temperature is calculated based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheating time. Key operating parameters include the freezer load, and the calculated maximum energy-saving set temperature varies under different freezer loads. The maximum energy-saving set temperature is calculated within the constraint of the maximum reheating time, and a temperature range is determined based on the maximum energy-saving set temperature and the normal set temperature. This range ensures that the energy-saving set temperature, regardless of adjustments, meets the relevant standard requirements for reheating time. Finally, within the temperature range, the optimal energy-saving set temperature is calculated, achieving the best energy-saving effect while ensuring product compliance.

[0050] In an optional embodiment, before calculating the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and a predefined maximum reheat time, the method further includes:

[0051] If the door remains inactive for more than the first threshold, the perishable parameter is disabled, and the freezer is not in the warm-up phase, the freezer will enter energy-saving mode.

[0052] The inactivity time of the door is the duration from the last time the freezer door was closed to the present.

[0053] In this embodiment, the freezer is equipped with a timer and a controller. The closing time of the freezer door can be determined by the door switch. When the freezer door is closed, the timer starts counting, and the controller continuously records the duration from the last time the freezer door was closed until the current time. This duration is the door inactivity time Cot. When the door inactivity time Cot reaches a first threshold Cot_0, it indicates that the freezer usage is low, which can be used as the first condition for energy-saving mode. The first threshold Cot_0 can be set to 2 hours.

[0054] Generally, freezers are set with a perishability parameter Prm. When Prm=1, the perishability mode is on; when Prm=0, the perishability mode is off. In this embodiment, Prm=0 is set as the second condition for entering energy-saving mode to prevent the internal temperature from rising when storing highly sensitive items.

[0055] When the overall temperature inside the freezer is high and needs to be reduced quickly, it will enter a warm-up phase. This phase is mutually exclusive with the energy-saving mode. Therefore, in this embodiment, the freezer not being in the warm-up phase is taken as the second condition for entering the energy-saving mode.

[0056] In this embodiment, the above three conditions must be met to determine that the freezer has entered the energy-saving stage.

[0057] Figure 3 The flowchart for obtaining the maximum energy-saving set temperature provided in this disclosure.

[0058] In an optional embodiment, the maximum energy-saving set temperature is calculated based on the key operating parameters of the freezer in energy-saving mode and a predefined maximum reheat time, including:

[0059] Step 301: Establish the first heat balance equation for the warming phase;

[0060] Step 302: Solve the first heat balance equation based on the maximum rewarming time and key operating parameters to obtain the highest energy-saving set temperature;

[0061] The warm-up phase refers to the phase after the energy-saving mode ends, during which the temperature inside the cabinet is reduced from the energy-saving set temperature to the normal set temperature.

[0062] The first heat balance equation describes the balance between the heat removed from the freezer during the warm-up phase and the heat leaked into the freezer from the environment.

[0063] Optionally, in the first heat balance equation, the heat exchange caused by the temperature difference between the freezer and the external environment during the heating and cooling phases is described by the average heat leakage coefficient. The heating phase refers to the stage at which the internal temperature of the freezer is raised from the normal set temperature sp to the energy-saving set temperature sp.d when the energy-saving mode is started.

[0064] In this embodiment, during the rewarming stage, the compressor needs to do work to reduce the cabinet temperature from the energy-saving set temperature sp.d to the normal set temperature sp, and the required rewarming time is t2. Based on the thermodynamic law Q = qt and Q = UAΔT, the first heat balance equation for the rewarming stage can be obtained:

[0065] (1)

[0066] Among them, is the average heat leakage coefficient, which is obtained by weighted averaging the heat leakage coefficients U at different temperature differences during the heating stage and the rewarming stage. Among them, the heat leakage coefficient U is the heat transfer coefficient corresponding to the heat exchange caused by the temperature difference between the cold cabinet and the external environment. The higher the heat leakage coefficient U, the more serious the cold leakage of the cold cabinet per unit time and unit area. The heat leakage coefficient U is generally related to the cold cabinet material and the heat transfer temperature difference. For the same cold cabinet, a mapping table between the embedded heat leakage coefficient U and the heat transfer temperature difference is provided; U i represents the heat leakage coefficient when the temperature inside the cabinet is i. The coverage range of the mapping table between the embedded heat leakage coefficient U and the heat transfer temperature difference needs to include [sp, sp.d max +2°C]. The formula for calculating the average heat leakage coefficient in the heating stage and the rewarming stage is , where i is an integer.

[0067] In this embodiment, in order to find the highest energy-saving set temperature sp.d max , the rewarming time t2 is set to the maximum rewarming time t0, and the highest energy-saving set temperature sp.d max to be obtained is substituted into the above first heat balance equation, and the following equation is obtained:

[0068] (2)

[0069] It can be simplified to the following formula:

[0070] (3)

[0071] By substituting the obtained key operating parameters (compressor refrigerating capacity q, specific heat capacity c, cold cabinet load m, heat transfer area A, and ambient temperature T2) and the calculated average heat leakage coefficient into the above formula (3) and solving, the highest energy-saving set temperature sp.d max can be obtained. In this embodiment, sp.d max ≥sp. If the calculated result is sp.d max <sp, then sp.d is forced to be equal to sp.

[0072] Figure 4 is the flowchart for obtaining the optimal energy-saving set temperature provided by this disclosure. As Figure 4As shown, within the temperature limit range, the optimal energy-saving setting temperature is calculated, including:

[0073] Step 401: Establish the total energy consumption function.

[0074] The total energy consumption function is used to simulate the sum of the energy consumed to maintain the cabinet temperature at the energy-saving set temperature in energy-saving mode and the energy consumed during the warm-up phase.

[0075] Step 402: Solve the total energy consumption function within the temperature limit range to obtain the minimum energy consumption value;

[0076] Step 403: Determine the energy-saving setting temperature corresponding to the lowest energy consumption value as the optimal energy-saving setting temperature.

[0077] In this embodiment, during the heating phase in energy-saving mode, the compressor does not start, the temperature inside the freezer rises, and the lost cooling energy is dissipated through the freezer's insulation layer. According to the thermodynamic laws Q=cmΔT and Q=UAΔT, the second heat balance equation for the heating phase can be obtained:

[0078] (4)

[0079] According to the second heat balance equation, we can derive .

[0080] The energy consumed in maintaining the cabinet temperature at the energy-saving set temperature in energy-saving mode specifically includes:

[0081] During the preset time after the internal temperature of the freezer is raised from the normal set temperature to the energy-saving set temperature (i.e., during the temperature holding phase), the compressor consumes energy to offset the heat that leaks into the freezer from the external environment.

[0082] During the temperature holding phase, the energy consumed by the compressor to counteract the heat leaking into the freezer from the external environment is .in It is the heat leakage coefficient when the temperature inside the cabinet is sp.d, which can be read from the embedded mapping table; It is the heat exchange temperature difference, which is the difference between the ambient temperature T2 of the freezer and the energy-saving set temperature sp.d.

[0083] During the warm-up phase, the compressor needs to perform work within the warm-up time t2 to reduce the cabinet temperature from the energy-saving set temperature sp.d to the normal set temperature sp. According to the first heat balance equation shown in equation (1), we can derive: .

[0084] During the warm-up phase, the energy consumed by the compressor is .

[0085] Total energy consumption is the sum of the energy consumed by the compressor during the temperature holding and recovery phases. The total energy consumption function is:

[0086] (5)

[0087] Therefore, in this embodiment, the temperature is limited within a certain range. The formula for calculating the minimum energy consumption value by solving the total energy consumption function internally is as follows:

[0088] (6)

[0089] The heat leakage coefficient U when the temperature inside the cabinet is sp.d sp.d Average heat leakage coefficient The following parameters are considered: heat exchange area A, heat exchange temperature difference ΔT1, duration of energy-saving mode t, compressor cooling capacity q, heating time t1, recovery time t2, and the calculated maximum energy-saving set temperature sp. max Substituting into the formula for calculating the minimum energy consumption value above, and simplifying, we get:

[0090] (7)

[0091] The objective of this embodiment is to find the interval The energy-saving setpoint temperature sp.d that minimizes the function Q is determined by this formula. The energy consumption value calculated based on this formula is the lowest energy consumption value under the current energy-saving mode for the current freezer load m, and the corresponding energy-saving setpoint temperature sp.d is the optimal energy-saving setpoint temperature for the current freezer load m. The maximum energy-saving setpoint temperature sp.d varies depending on the freezer load m. max The optimal energy-saving setting temperature varies depending on the specific refrigerator load and the independent variable 'm' in the formula.

[0092] In an optional embodiment, after calculating the optimal energy-saving set temperature within a temperature limit range, the method further includes:

[0093] The freezer will exit energy-saving mode after running at the optimal energy-saving temperature for a specified time.

[0094] If the refrigerator door is detected to be opening or closing or to enter defrosting mode during the operation of energy-saving mode, the energy-saving mode will be exited in advance.

[0095] Optionally, the freezer lights will turn off when the freezer enters energy-saving mode.

[0096] This disclosure also provides an energy-saving control system for a freezer, the system including a controller;

[0097] The controller is configured as follows:

[0098] Calculate the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheat time.

[0099] The temperature limit range is determined based on the highest energy-saving setting temperature and the normal setting temperature.

[0100] Within the temperature limit, the optimal energy-saving setting temperature is calculated;

[0101] Among them, the maximum energy-saving setting temperature is the highest cabinet temperature that can be set in energy-saving mode; the normal setting temperature is the cabinet temperature set in normal mode; and the energy-saving setting temperature is the cabinet temperature set in energy-saving mode.

[0102] Key operating parameters include the load on the freezer.

[0103] This disclosure also provides a computer-readable storage medium storing at least one instruction that is executed by a processor to implement the methods described in the various embodiments above.

[0104] This disclosure also provides a computer program product including computer instructions stored in a computer-readable storage medium; a processor of a computing device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computing device to perform the methods described in the various embodiments above.

[0105] Those skilled in the art will recognize that the functions described in this disclosure in one or more of the examples above can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0106] It should be noted that the technical solutions described in this disclosure can be combined arbitrarily as long as they do not conflict.

[0107] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for energy-saving control of a freezer, characterized in that, The method includes: Calculate the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheat time. The temperature limit range is determined based on the maximum energy-saving setting temperature and the normal setting temperature. Within the specified temperature range, the optimal energy-saving setting temperature is calculated. The maximum energy-saving setting temperature is the highest cabinet temperature that can be set in energy-saving mode; the normal setting temperature is the cabinet temperature set in normal mode; and the energy-saving setting temperature is the cabinet temperature set in energy-saving mode. The key operating parameters include the freezer load.

2. The energy-saving control method for a freezer according to claim 1, characterized in that, The calculation of the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheat time includes: Establish the first heat balance equation for the warming phase; Based on the maximum temperature recovery time and the key operating parameters, the first heat balance equation is solved to obtain the highest energy-saving set temperature; The warm-up phase refers to the phase after the energy-saving mode ends, during which the temperature inside the cabinet is reduced from the energy-saving set temperature to the normal set temperature. The first heat balance equation is used to describe the balance between the heat removed by the freezer during the warm-up phase and the heat leaked into the freezer from the environment.

3. The energy-saving control method for a freezer according to claim 2, characterized in that, In the first heat balance equation, the heat exchange caused by the temperature difference between the freezer and the external environment during the heating and cooling phases is described by the average heat leakage coefficient. The heating phase refers to the stage at which the cabinet temperature rises from the normal set temperature to the energy-saving set temperature when the energy-saving mode is started.

4. The energy-saving control method for a freezer according to claim 2, characterized in that, The calculation of the optimal energy-saving setting temperature within the specified temperature range includes: Establish the total energy consumption function; Solve the total energy consumption function within the temperature limit range to obtain the minimum energy consumption value; The energy-saving setting temperature corresponding to the lowest energy consumption value is determined as the optimal energy-saving setting temperature; The total energy consumption function is used to simulate the sum of the energy consumed to maintain the cabinet temperature at the energy-saving set temperature in energy-saving mode and the energy consumed in the warm-up phase.

5. The energy-saving control method for a freezer according to claim 4, characterized in that, The energy consumed in maintaining the cabinet temperature at the energy-saving set temperature in energy-saving mode includes: During a preset time period after the internal temperature of the freezer is raised from the normal set temperature to the energy-saving set temperature, the compressor consumes energy to offset the heat leaking into the freezer from the external environment.

6. The energy-saving control method for a freezer according to claim 2, characterized in that, Before calculating the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheat time, the method further includes: If the door remains inactive for more than the first threshold, the perishable parameter is disabled, and the freezer is not in the warm-up phase, the freezer will enter energy-saving mode. The inactivity time of the door is the duration from the last time the freezer door was closed to the present.

7. The energy-saving control method for a freezer according to claim 1, characterized in that, After calculating and obtaining the optimal energy-saving setting temperature within the temperature limit range, the method further includes: The freezer will exit energy-saving mode after running at the optimal energy-saving temperature for a specified duration. If the refrigerator door is detected to be opening or closing or to enter defrosting mode during the operation of energy-saving mode, the energy-saving mode will be exited in advance.

8. A freezer energy-saving control system, characterized in that, The system includes a controller; The controller is configured to: Calculate the maximum energy-saving set temperature based on the key operating parameters of the freezer in energy-saving mode and the predefined maximum reheat time. The temperature limit range is determined based on the maximum energy-saving setting temperature and the normal setting temperature. Within the specified temperature range, the optimal energy-saving setting temperature is calculated. The maximum energy-saving setting temperature is the highest cabinet temperature that can be set in energy-saving mode; the normal setting temperature is the cabinet temperature set in normal mode; and the energy-saving setting temperature is the cabinet temperature set in energy-saving mode. The key operating parameters include the freezer load.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one instruction, which is executed by a processor to implement the method as described in any one of claims 1-7.

10. A freezer, characterized in that, The freezer includes the freezer energy-saving control system as described in claim 8.

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