Control method and device of air source heat pump unit, storage medium and electronic equipment

Abstract

This application discloses a control method, device, storage medium, and electronic equipment for an air source heat pump unit, relating to the field of heat pump technology. The method includes: determining a pre-defrosting unit and a heat compensation pre-defrosting unit from multiple air source heat pump units; determining the frost thickness value of the pre-defrosting unit; calculating a heat load deficit value based on the required heating capacity and the available heating capacity of the heat compensation pre-defrosting unit; and determining a defrosting control action based on the frost thickness value and the heat load deficit value, so as to coordinately control the multiple air source heat pump units according to the defrosting control action. In scenarios where multiple air source heat pump units operate collaboratively, this application can improve the heat supply effect while simultaneously improving defrosting reliability and reducing defrosting energy consumption.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, specifically to a control method, device, storage medium, and electronic equipment for an air source heat pump unit. Background Technology

[0002] In scenarios where multiple air source heat pump units operate in tandem, the defrosting strategy typically used by these units is based on triggering defrosting at fixed times or temperature thresholds. This not only easily leads to redundant defrosting when there is no frost or very little frost, resulting in low defrosting reliability, but also requires the units to stop heating during defrosting, which results in insufficient heat supply and poor heat delivery. The reliance on electric auxiliary heating to compensate for the heat further increases defrosting energy consumption. Summary of the Invention

[0003] This application provides a control scheme for an air source heat pump unit. In scenarios where multiple air source heat pump units operate in coordination for heating, the heat supply effect can be improved while simultaneously enhancing defrosting reliability and reducing defrosting energy consumption.

[0004] The embodiments of this application provide the following technical solutions: According to one embodiment of this application, a control method for an air source heat pump unit is provided. The method includes: determining a pre-defrosting unit and a heat compensation pre-defrosting unit from a plurality of air source heat pump units; determining the frost thickness value of the pre-defrosting unit; calculating a heat load gap value based on the required heating capacity and the available heating capacity of the heat compensation pre-defrosting unit; and determining a defrosting control action based on the frost thickness value and the heat load gap value, so as to coordinately control the plurality of air source heat pump units according to the defrosting control action.

[0005] According to one embodiment of this application, a control device for an air source heat pump unit includes: a unit allocation module, configured to: determine a pre-defrosting unit and a heat compensation pre-defrosting unit from multiple air source heat pump units; a frosting determination module, configured to: determine the frosting thickness value of the pre-defrosting unit; a heating analysis module, configured to: calculate a heat load gap value based on the required heating capacity and the available heating capacity of the heat compensation pre-defrosting unit; and an action determination module, configured to: determine a defrosting control action based on the frosting thickness value and the heat load gap value, so as to coordinately control the multiple air source heat pump units according to the defrosting control action.

[0006] According to another embodiment of this application, a storage medium stores a computer program thereon, which, when executed by a processor of an electronic device, causes the electronic device to perform the methods described in the embodiments of this application.

[0007] According to another embodiment of this application, an electronic device may include: a memory storing a computer program; and a processor reading the computer program stored in the memory to execute the methods described in the embodiments of this application.

[0008] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0009] In this embodiment, a pre-defrosting unit and a heat compensation pre-defrosting unit are determined from multiple air source heat pump units; the frost thickness value of the pre-defrosting unit is determined; a heat load gap value is calculated based on the required heating capacity and the available heating capacity of the heat compensation pre-defrosting unit; and a defrosting control action is determined based on the frost thickness value and the heat load gap value to coordinately control the multiple air source heat pump units according to the defrosting control action.

[0010] In this embodiment of the application, a standby defrosting unit and a heat compensation standby unit are determined from multiple air source heat pump units. The frost thickness value reflects the frost thickness of the evaporator of the standby defrosting unit, and the heat load gap value reflects the shortage between the heating capacity of the heat compensation standby unit and the total required heating capacity. By combining the frost thickness value and the heat load gap value, the appropriate defrosting control action can be determined by taking into account both the frost condition and the heating capacity shortage. The multiple air source heat pump units are coordinated and controlled according to the defrosting control action. In the scenario of multiple air source heat pump units operating in coordination for heating, the heat supply effect can be improved while taking into account both improving defrosting reliability and reducing defrosting energy consumption. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A flowchart illustrating a control method for an air source heat pump unit according to an embodiment of this application is shown.

[0013] Figure 2 A schematic diagram of a frosting correction factor curve according to an embodiment of this application is shown.

[0014] Figure 3 A flowchart for determining the pre-defrosting unit in a defrosting scenario is shown.

[0015] Figure 4 A flowchart of unit collaborative control in a defrosting scenario is shown.

[0016] Figure 5 A flowchart of defrost exit control in a defrost scenario is shown.

[0017] Figure 6 A block diagram of a control device for an air source heat pump unit according to an embodiment of this application is shown.

[0018] Figure 7 A block diagram of an electronic device according to an embodiment of this application is shown. Detailed Implementation

[0019] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments provided herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure. Furthermore, the embodiments provided below are some embodiments for implementing the present disclosure, and not all embodiments for implementing the present disclosure. Unless otherwise specified, the technical solutions described in the embodiments of the present disclosure can be implemented in any combination. It should be noted that, in the embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method or apparatus that includes a list of elements includes not only the elements expressly described, but also other elements not expressly listed, or elements inherent to implementing the method or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other related elements (e.g., steps in the method or units in the apparatus; for example, a unit may be a portion of circuitry, a portion of a processor, a portion of a program or software, etc.) in the method or apparatus that includes that element. For example, the control method for an air source heat pump unit provided in this disclosure includes a series of steps. However, the control method for an air source heat pump unit provided in this disclosure is not limited to the steps described. Similarly, the control device for an air source heat pump unit provided in this disclosure includes a series of units. However, the device provided in this disclosure is not limited to the units explicitly described, but may also include units that need to be set up to obtain relevant information or to process information. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. It is understood that in the specific implementation of this application, relevant data is involved. When the embodiments in this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0020] In scenarios where multiple air source heat pump units operate in tandem, the defrosting strategy adopted by the air source heat pump units is usually based on triggering defrosting at fixed times or temperature thresholds. This not only easily leads to redundant defrosting situations when there is no frost or very little frost, resulting in low defrosting reliability, but also requires the unit to stop heating during defrosting, which can result in the inability to meet heat demand. This necessitates the reliance on electric auxiliary heating to compensate for heat, leading to high defrosting energy consumption.

[0021] To address these issues, this application provides a control scheme for an air source heat pump unit. In scenarios where multiple air source heat pump units operate in coordination for heating, the scheme can improve the heat supply effect while simultaneously enhancing defrosting reliability and reducing defrosting energy consumption.

[0022] The following describes in detail the relevant embodiments of the control scheme for the air source heat pump unit provided in this application. The air source heat pump unit can be a modular unit, a water heater, a multi-split unit, or other unit that utilizes an air source heat pump.

[0023] Figure 1 A flowchart illustrating a control method for an air source heat pump unit according to an embodiment of this application is shown. The execution entity of this control method can be a control module with processing capabilities. The control module can be installed in electronic devices such as the air source heat pump unit, remote control, wired controller, mobile phone, computer, smartwatch, and other home appliances. The control module may include at least a memory and a processor. In some embodiments, the control module can be installed on a server (such as a cloud server or physical server) for remote control of the air source heat pump unit.

[0024] In one embodiment of this application, the control module, which serves as the execution body of the control method for the air source heat pump unit, is specifically disposed within the air source heat pump unit. The control module may include a processor and a memory, i.e., the air conditioner includes the processor and memory, with the memory storing a computer program. Thus, the processor in the air source heat pump unit can read the computer program stored in the memory to execute the methods of the various embodiments of this application.

[0025] like Figure 1 As shown, the control method of the air source heat pump unit may include steps S110 to S140.

[0026] Step S110: Select the standby defrosting unit and the heat compensation standby unit from multiple air source heat pump units; Step S120: Determine the frost thickness value of the pre-defrosting unit; Step S130: Calculate the heat load gap value based on the required heating capacity and the available heating capacity of the heat compensation reserve unit; Step S140: Determine the defrost control action based on the frost thickness value and the heat load gap value, so as to coordinate the control of multiple air source heat pump units according to the defrost control action.

[0027] One air source heat pump unit is selected from multiple air source heat pump units as the backup defrosting unit. The remaining air source heat pump units, excluding the selected backup defrosting unit, are used as heat compensation backup units. The backup defrosting unit is the air source heat pump unit that is prioritized for defrosting, and the heat compensation backup unit is the air source heat pump unit used for heat compensation.

[0028] For the pre-defrosting unit, determine the frost thickness value, which reflects the frost thickness on the evaporator of the pre-defrosting unit. This frost thickness value can be determined based on relevant test data of the evaporator of the pre-defrosting unit.

[0029] The heat load gap is calculated based on the required heating capacity and the available heating capacity of the heat compensation standby units. This gap reflects the shortage between the heating capacity of the heat compensation standby units and the total required heating capacity. The required heating capacity is the theoretical heating capacity (kW) required for the location utilizing these multiple air source heat pump units. The available heating capacity of the heat compensation standby units is the heating capacity (kW) that these units can output.

[0030] Furthermore, since the frost thickness value reflects the frost thickness of the evaporator of the standby defrosting unit, and the heat load gap value reflects the shortage between the heating capacity of the heat compensation standby unit and the total required heating capacity, combining the frost thickness value and the heat load gap value allows for the determination of appropriate defrosting control actions while taking into account both the frost condition and the heating capacity shortage. This allows for coordinated control of multiple air source heat pump units according to the defrosting control action, which can avoid redundant defrosting and improve defrosting reliability. It can also effectively control the heating capacity compensation of the heat compensation standby unit, avoiding reliance on electric auxiliary heating for heat compensation, thus ensuring heating demand while reducing defrosting energy consumption.

[0031] In summary, using the method described in this embodiment, a standby defrosting unit and a heat compensation standby unit are determined from multiple air source heat pump units. The frost thickness value reflects the frost thickness of the evaporator of the standby defrosting unit, and the heat load gap value reflects the shortage between the heating capacity of the heat compensation standby unit and the total required heating capacity. By combining the frost thickness value and the heat load gap value, both the frost condition and the heating capacity shortage can be taken into account to determine the appropriate defrosting control action. According to the defrosting control action, multiple air source heat pump units are coordinated and controlled. In the scenario of multiple air source heat pump units operating in coordination for heating, the heat supply effect can be improved while taking into account both improving defrosting reliability and reducing defrosting energy consumption.

[0032] The following description Figure 1 Further optional specific embodiments are provided for the steps performed when controlling an air source heat pump unit as described in the example.

[0033] In one embodiment, step S110, determining the pre-defrosting unit and the heat compensation pre-defrosting unit from multiple air source heat pump units, may include: calculating the frosting unevenness coefficient of the multiple air source heat pump units based on the unit status data of the multiple air source heat pump units; determining whether the frosting unevenness coefficient and the unit status data meet the preset allocation conditions; if the preset allocation conditions are met, then determining the pre-defrosting unit and the heat compensation pre-defrosting unit from the multiple air source heat pump units.

[0034] Since the frosting of multiple air source heat pump units varies, the frosting unevenness coefficient η is calculated based on the unit status data of multiple air source heat pump units. The frosting unevenness coefficient η can reflect the differences (i.e., unevenness) in frosting among multiple air source heat pump units.

[0035] When the frost unevenness coefficient and unit status data of multiple air source heat pump units meet the preset allocation conditions, it further triggers the determination of reserve defrosting units and heat compensation reserve units from multiple air source heat pump units, further improving the reliability of multi-unit coordinated defrosting based on the embodiments of this application.

[0036] Furthermore, in one embodiment, the unit status data includes inlet air temperature and evaporator surface temperature; the frosting unevenness coefficient of multiple air source heat pump units is calculated based on the unit status data of multiple air source heat pump units, including: calculating the temperature drop rate of the evaporator of each air source heat pump unit based on the inlet air temperature and evaporator surface temperature of each air source heat pump unit; calculating the average temperature drop rate based on the average temperature drop rate of multiple air source heat pump units; and calculating the frosting unevenness coefficient based on the average temperature drop rate and the temperature drop rate of multiple air source heat pump units.

[0037] When calculating based on the inlet air temperature and evaporator surface temperature of each air source heat pump unit, the specific calculation can be performed according to the formula. Calculations are performed, in which, That is, the temperature drop rate (°C / min) of the evaporator of the i-th air source heat pump unit. Let be the inlet air temperature (°C) of the i-th air source heat pump unit. The evaporator surface temperature (°C) of the i-th air source heat pump unit; the temperature difference between the inlet air temperature and the evaporator surface temperature of the i-th air source heat pump unit. = - , For the predetermined monitoring cycle (e.g., 10 minutes).

[0038] The average temperature drop rate is calculated by averaging the temperature drop rates of multiple air-source heat pump units. The specific calculation can be performed using the formula... The calculation is performed, where n is the total number of air source heat pump units. That is, the average rate of temperature decrease.

[0039] Alternatively, in some methods, the average temperature drop rate and the corresponding frosting unevenness coefficient for the temperature drop rate of multiple air source heat pump units can be retrieved from a preset coefficient table. .

[0040] Furthermore, in one approach, the frosting unevenness coefficient is calculated based on the average temperature drop rate and the corresponding temperature drop rates of multiple air-source heat pump units. At that time, specifically according to the formula This calculation method allows for a more accurate and dynamic calculation of the frost unevenness coefficient. .

[0041] Furthermore, in one embodiment, the unit status data includes the temperature difference between the inlet air temperature and the evaporator surface temperature, and the fan power change rate; determining whether the frosting unevenness coefficient and the unit status data meet preset allocation conditions includes: when the frosting unevenness coefficient... The temperature difference between any two air source heat pump units is greater than or equal to the preset coefficient A. The difference between the lower limit and the greater than or equal to the lower limit And the rate of change of wind turbine power If the value is greater than or equal to the preset rate of change C, then the preset allocation condition is satisfied.

[0042] exist ≥A, Any air source heat pump unit ≥ and When C is reached, the preset allocation conditions are met. At this time, it is further triggered to determine the standby defrosting unit and the heat compensation standby unit from multiple air source heat pump units, which further improves the reliability of multi-unit collaborative defrosting based on the embodiments of this application.

[0043] The preset coefficient A can be set according to the actual situation; for example, the preset coefficient A can be between 0.25 and 0.40. The preset rate of change C can be set according to the actual situation; for example, the preset rate of change C can be between 5% and 12%.

[0044] Furthermore, in one approach, =k1*B, where B is the set difference, k1 is the frost correction coefficient, and k1 dynamically changes with outdoor ambient temperature and humidity. B can be set according to actual conditions; for example, B can be between 10℃ and 15℃. The lower limit difference calculated in this way, when used in the embodiments of this application, can further improve the reliability of multi-unit coordinated defrosting. Furthermore, in a preferred embodiment, k1 is a curve showing the dynamic changes in outdoor ambient temperature and humidity as follows: Figure 2 The frost correction factor curve 200 shows that the outdoor ambient temperature is less than the predetermined temperature change T. 变 When the outdoor ambient temperature increases, k1 increases; when the outdoor ambient temperature is greater than the predetermined temperature change T... 变 At that time, k1 decreases as the outdoor ambient temperature increases; and k1 increases as the ambient humidity increases.

[0045] Furthermore, in one embodiment, determining the pre-defrosting unit and the heat compensation pre-defrosting unit from multiple air source heat pump units may include: determining the defrosting priority of each air source heat pump unit; determining the air source heat pump unit corresponding to the highest defrosting priority as the pre-defrosting unit; and the heat compensation pre-defrosting unit includes the remaining air source heat pump units excluding the pre-defrosting units.

[0046] By determining the defrosting priority of each air source heat pump unit The highest defrosting priority (max) among multiple air source heat pump units. The air source heat pump unit corresponding to the specified unit is designated as the backup defrosting unit, and the remaining air source heat pump units (excluding the backup defrosting unit) among multiple air source heat pump units serve as heat compensation backup units. Furthermore, during multi-unit collaborative defrosting, the air source heat pump unit with the highest defrosting priority can be prioritized for defrosting, further improving the reliability of multi-unit collaborative defrosting.

[0047] In one embodiment, a corresponding defrosting priority is pre-set for each air source heat pump unit.

[0048] Furthermore, in one embodiment, determining the defrosting priority of each air source heat pump unit may include: calculating the required heating capacity based on the heating area, target temperature, and outdoor ambient temperature; calculating the total output heating capacity of the remaining air source heat pump units after excluding each air source heat pump unit, thus obtaining the total output heating capacity corresponding to each air source heat pump unit; determining the maximum temperature drop rate from the temperature drop rates of the evaporators of multiple air source heat pump units; and calculating the priority coefficient corresponding to each air source heat pump unit based on the required heating capacity, the maximum temperature drop rate, and the total output heating capacity and temperature drop rate corresponding to each air source heat pump unit, wherein a higher priority coefficient indicates a higher defrosting priority.

[0049] In this embodiment, dynamic calculations are performed based on the required heating capacity, the maximum temperature drop rate, and the total output heating capacity and temperature drop rate of each air source heat pump unit to obtain the priority coefficient corresponding to each air source heat pump unit. Then, the defrosting priority of each air source heat pump unit is calculated through dynamic load allocation. The standby defrosting unit and the heat compensation standby unit are selected according to the defrosting priority determined in this way, which can further improve the defrosting reliability and heat supply effect.

[0050] The required heating capacity is calculated based on the area of ​​the heating zone, the target temperature, and the outdoor ambient temperature. At that time, specifically according to the formula Accurately calculate the required heating capacity Where k is the heat loss coefficient of the building envelope (kW / (℃·m²)). The area of ​​the heating area. The target indoor temperature (°C) set for the user. The outdoor ambient temperature is (°C).

[0051] When calculating the total output heating capacity of the remaining air source heat pump units after excluding each individual unit, the specific calculation can be done using the formula... Calculations are performed to obtain the total output heating capacity corresponding to the i-th air source heat pump unit. (That is, the available heating capacity of the remaining air source heat pump units after excluding the i-th air source heat pump unit). The output heating capacity (kW) of the j-th unit is the sum of the output heating capacities of the remaining air source heat pump units, excluding the i-th unit. "That is equal to "the total output heating capacity corresponding to the i-th air source heat pump unit". ".

[0052] When calculating based on the required heating capacity, maximum temperature drop rate, and the total output heating capacity and temperature drop rate for each air source heat pump unit, the specific calculation can be performed according to the formula. Calculations are performed, in which, This refers to the priority coefficient corresponding to the i-th air source heat pump unit. That is, the temperature drop rate (°C / min) of the evaporator of the i-th air source heat pump unit. That is, the maximum rate of temperature decrease.

[0053] in, A preset defrost guarantee weighting factor is used to ensure that air source heat pump units with the most severe frost buildup are defrosted first. It can be set according to the actual situation, for example, It is preferable to have a value between 0.55 and 0.70; This is a system stability weighting coefficient, which can be used to ensure the stability of the overall system output heat of multiple air source heat pump units. It can be set according to the actual situation, for example, It is preferable to have a value between 0.30 and 0.45.

[0054] Furthermore, in one approach, the output heating capacity of the j-th unit... ,in, Specific heat capacity of water (kJ / (kg·℃)) The water mass flow rate (kg / s) of the j-th air source heat pump unit. The outlet water temperature of the j-th air source heat pump unit is... The inlet water temperature of the j-th air source heat pump unit is denoted as .

[0055] In one embodiment, step S120, determining the frost thickness value of the pre-defrosting unit, may include: calculating the pressure difference ratio between the air-side pressure difference of the evaporator in the pre-defrosting unit and the reference pressure difference; and determining the pressure difference ratio as the frost thickness value.

[0056] Specifically, it can be done according to the formula The frosting thickness value F is calculated, where, To prepare the air-side pressure difference of the evaporator in the defrosting unit (i.e., the measured air-side pressure difference (Pa)). The reference pressure difference (i.e., the reference pressure difference (Pa) when the evaporator is clean and free of frost). The ratio of the air-side pressure difference to the reference pressure difference is determined as the frost thickness value, which reflects the ratio of the current degree of frost on the evaporator to its clean state.

[0057] In one embodiment, step S130, calculating the heat load gap value based on the required heating capacity and the available heating capacity of the heat compensation reserve unit, may include: subtracting the available heating capacity from the required heating capacity to obtain the heating capacity difference; and dividing the heating capacity difference by the required heating capacity to obtain the heat load gap value.

[0058] Specifically, it can be done according to the formula The calculated heat load deficit value H is obtained, where the i-th air source heat pump unit serves as a backup defrosting unit. That is, the available heating capacity of the heat compensation reserve unit (i.e., the available heating capacity of the remaining air source heat pump units after excluding the i-th air source heat pump unit). This heat load deficit value reflects the ratio of the current heating capacity to the required heating capacity.

[0059] In one embodiment, step S140, determining the defrosting control action based on the frost thickness value and the heat load gap value, may include: determining the degree of frost based on the frost thickness value; determining the heating state based on the heat load gap value; and determining the preset control action corresponding to the degree of frost and the heating state as the defrosting control action.

[0060] The degree of frost is determined by the frost thickness value (e.g., light frost, moderate frost, severe frost, etc.), and the heating status is determined by the heat load deficit value (e.g., sufficient system heating, partial heating shortage, and severe heating deficiency, etc.). The defrosting control action is determined by combining the degree of frost and the heating status. This can further effectively take into account both the degree of frost and the heating shortage to determine the appropriate defrosting control action.

[0061] In the defrost action table, preset control actions can be set for different combinations of frost levels and heating states. Based on the frost level and heating state determined in this case, the corresponding preset control actions (i.e., the defrost control actions determined in this case) can be accurately determined from the defrost action table.

[0062] In one embodiment, the degree of frost is determined based on the frost thickness value. Specifically, this can be achieved by retrieving a preset degree from a preset degree table, where the frost thickness value falls within a specified range, and using this preset degree as the frost degree. The heating capacity state is determined based on the heat load gap value. Specifically, this can be achieved by retrieving a preset state from a preset state table, where the heat load gap value falls within a specified gap value range, and using this preset state as the heating capacity state.

[0063] Furthermore, in one embodiment, the degree of frost is determined based on the frost thickness value F. Specifically, as shown in the frost determination strategy table below, the membership degree of the frost subset corresponding to different frost degrees is calculated according to the first membership degree calculation function corresponding to different frost degrees, based on the frost thickness value. Then, the frost degree corresponding to the highest frost subset membership degree is selected as the final determined frost degree. When multiple frost subsets have the same membership degree, the frost degree corresponding to the frost subset with the highest membership degree priority is selected as the final determined frost degree in descending order of membership degree priority (High>Medium>Low).

[0064]

[0065] Based on the first membership function corresponding to different frost levels, the membership degree of the frost subset corresponding to different frost levels is calculated according to the frost thickness value F. Specifically, this may include: selecting a first membership function from the first membership function corresponding to "slight frost" based on the range of F, and calculating the membership degree of the frost subset corresponding to "slight frost". From the first membership function corresponding to "moderate frost", select one first membership function based on the range of F to calculate the membership degree of the frost subset corresponding to "moderate frost". From the first membership function corresponding to "severe frost", select one first membership function based on the range of F to calculate the membership degree of the frost subset corresponding to "severe frost". .

[0066] Then, the degree of frost corresponding to the highest membership degree of the frost subset is selected as the final determined degree of frost, i.e., the degree of frost calculated from the subset. , , Select the highest membership degree of the frosting subset, and use the frosting degree corresponding to the highest membership degree of the frosting subset as the final determined frosting degree. For example, the highest membership degree of the frosting subset is... At that time, the final determined degree of frosting is "medium frosting".

[0067] Furthermore, if the calculated , , When they are equal, select the membership degree of the frosting subset with the highest membership degree priority (i.e., High>Medium>Low) in descending order of membership degree priority. ), and will The corresponding frosting level, "severe frosting," is used as the final determined frosting level.

[0068] Furthermore, in one embodiment, the heating capacity state is determined based on the heat load gap value. Specifically, as shown in the state determination strategy table below, the membership degree of the state subset corresponding to different heating capacity states is calculated according to the second membership degree calculation function based on the heat load gap value H. Then, the heating capacity state corresponding to the highest membership degree of the state subset is selected as the final determined heating capacity state. When multiple state subsets have the same membership degree, the heating capacity state corresponding to the highest membership degree priority is selected as the final determined heating capacity state in descending order of membership degree priority (High>Medium>Low).

[0069]

[0070] Based on the second membership function corresponding to different heating states, and according to the heat load gap value H, the membership degree of the state subset corresponding to different heating states is calculated. Specifically, this may include: selecting a second membership function from the second membership function corresponding to "sufficient system heating" based on the range of H, and calculating the membership degree of the state subset corresponding to "sufficient system heating". From the second membership function corresponding to "partial shortage of heating capacity", select a second membership function based on the range of H to calculate the membership degree of the state subset corresponding to "partial shortage of heating capacity". From the second membership function corresponding to "severely insufficient heating capacity", select a second membership function based on the range of H to calculate the membership degree of the state subset corresponding to "severely insufficient heating capacity". .

[0071] Then, the heating capacity state corresponding to the highest membership degree of the subset of states is selected as the final determined heating capacity state, i.e., the state calculated from the subset of states. , , Select the highest membership degree of the state subset, and take the heating state corresponding to the highest membership degree of the state subset as the final determined heating state. For example, the highest membership degree of the state subset is... At that time, the final determined heating state is "heating capacity partially insufficient".

[0072] Furthermore, if the calculated , , When they are equal, select the subset of states with the highest membership priority (i.e., the subset of states with the highest membership priority) in descending order of membership priority (High>Medium>Low). ), and will The corresponding heating capacity status, "severely insufficient heating capacity," is the final determined heating capacity status.

[0073] The parameters in the parameter range in the table above can be set according to the actual situation. For example, in a preferred embodiment, the parameters... and Set to 0, parameter >1, >1; Parameter < and > ,parameter < and > ,parameter < and > ,parameter < and > ;parameter > > ,parameter > > The "Function Type" column in the table above also describes the types of the first membership calculation function and the second membership calculation function.

[0074] Furthermore, in the defrost action table, corresponding preset control actions can be pre-set for different combinations of frost levels and heating states. Based on the frost level and heating state determined in this instance, the corresponding preset control action (i.e., the defrost control action determined in this instance) can be accurately determined from the defrost action table. In one specific embodiment, the defrost action table is shown in the table below.

[0075]

[0076] Among them, Low1, Medium1, and High1 correspond to slight frost, moderate frost, and severe frost, respectively; Low2, Medium2, and High2 correspond to sufficient system heating, partial heating, and severe heating deficiency, respectively.

[0077] Furthermore, in one embodiment, the defrosting control action includes increasing the compressor frequency of the heat compensation reserve unit to a target frequency (i.e., increasing the frequency of the compensation unit; for example, as shown in the table above, the preset control actions corresponding to the Low1 and Medium2 combinations include increasing the compensation unit frequency). In this case, a dynamic frequency adjustment strategy is used to determine the target frequency. Specifically, when the heat load deficit value H is greater than the preset deficit value G, the target frequency... The target frequency is equal to the predetermined first frequency. When the heat load deficit value H is less than or equal to the preset deficit value G, the target frequency is calculated based on the heat load deficit value H and preset parameters. A dynamic frequency adjustment strategy is used to determine the target frequency, and the compressor frequency of the heat compensation reserve unit is increased to this target frequency to further ensure the frequency increase effect.

[0078] In one preferred embodiment, the target frequency can be determined according to the following dynamic frequency adjustment strategy: In this example, the predetermined first frequency is 10, using the formula... The target frequency is calculated based on the heat load deficit value H and preset parameters. Furthermore, G can be set according to actual conditions; for example, G is preferably between 0.4 and 0.6.

[0079] Furthermore, the target frequency can be limited to a predetermined upper limit (e.g., 10Hz) to prevent compressor overload. Additionally, the available heating capacity of the heat compensation standby unit can be monitored in real time. ,according to The compressor frequency is adjusted once for each predetermined adjustment duration (e.g., 2 minutes, 3 minutes, etc.). Adjustments are only made if the heat output is less than the preset amount.

[0080] In one embodiment, after determining the defrost control action based on the frost thickness value and the heat load gap value, the method may further include: determining the evaporator temperature recovery rate and defrost duration of the pre-defrost unit when it is defrosting; determining the defrost exit action based on the evaporator temperature recovery rate and the defrost duration; and controlling the pre-defrost unit to exit defrost based on the defrost exit action.

[0081] During the defrosting process after the pre-defrosting unit starts defrosting mode, the evaporator temperature recovery rate (reflecting defrosting efficiency) and defrosting duration of the pre-defrosting unit are determined. The defrosting exit action is determined by combining the evaporator temperature recovery rate and defrosting duration. The pre-defrosting unit is controlled to exit defrosting according to the defrosting exit action. This can take into account both defrosting efficiency and defrosting duration, and further improve the reliability of defrosting exit.

[0082] The evaporator temperature recovery rate R of the pre-defrosting unit can be calculated using the following formula: ,in, The temperature (°C) of the evaporator surface in the last second before the defrost mode is exited can be set. The evaporator surface temperature (°C) can be set in the first second before entering defrost mode. This refers to the defrosting duration.

[0083] In one embodiment, the defrost exit action is determined based on the evaporator temperature recovery rate and the defrost duration. Specifically, this may include: determining the defrost speed based on the evaporator temperature recovery rate; determining the defrost duration based on the defrost duration; and determining the preset exit action corresponding to the defrost speed and defrost duration as the defrost exit action.

[0084] The defrosting speed is determined by the evaporator temperature recovery rate (e.g., slow defrosting speed, normal defrosting speed, extremely fast defrosting speed, etc.), and the defrosting duration is determined by the defrosting time (e.g., too short defrosting time, normal defrosting time, too long defrosting time, etc.). Combining the defrosting speed and defrosting time determines the defrosting exit action, which can further effectively take into account both the defrosting speed and defrosting time to determine the appropriate defrosting exit action.

[0085] In the exit action table, preset exit actions can be set in advance for different combinations of defrosting speed and defrosting duration. Based on the defrosting speed and defrosting duration determined in this case, the corresponding preset exit action (i.e., the defrosting exit action determined in this case) can be accurately determined from the exit action table.

[0086] Furthermore, in one embodiment, the defrosting speed is determined based on the evaporator temperature recovery rate R. Specifically, as shown in the speed determination strategy table below, the membership degree of the speed subset corresponding to different defrosting speeds is calculated according to the third membership degree calculation function based on the evaporator temperature recovery rate R. Then, the defrosting speed corresponding to the highest membership degree of the speed subset is selected as the final defrosting speed. When multiple speed subsets have the same membership degree, the defrosting speed corresponding to the speed subset with the highest membership degree priority is selected as the final defrosting speed according to the membership degree priority from high to low (High>Medium>Low).

[0087]

[0088] Based on the third membership function corresponding to different defrosting speeds, and according to the evaporator temperature recovery rate R, the membership degree of the speed subset corresponding to different defrosting speeds is calculated. Specifically, this may include: selecting a third membership function from the third membership function corresponding to "slow defrosting speed" based on the range of R, and calculating the membership degree of the speed subset corresponding to "slow defrosting speed". From the third membership function corresponding to "normal defrosting speed", select one third membership function based on the range of R to calculate the membership degree of the speed subset corresponding to "normal defrosting speed". From the third membership function corresponding to "extremely fast defrosting speed", select a third membership function based on the range of R to calculate the membership degree of the speed subset corresponding to "extremely fast defrosting speed". .

[0089] Then, the defrosting speed corresponding to the highest speed subset membership degree is selected as the final defrosting speed, i.e., the calculated defrosting speed. , , Select the highest membership degree of the speed subset, and use the defrosting speed corresponding to the highest membership degree of the speed subset as the final defrosting speed. For example, the highest membership degree of the speed subset is... The final defrosting speed determined at that time is the "normal defrosting speed".

[0090] Furthermore, if the calculated , , When the memberships are equal, select the membership of the speed subset with the highest membership priority (i.e., Fast > Normal > Slow) in descending order of membership priority. ), and will The defrosting speed condition "extremely fast defrosting speed" is the final determined defrosting speed condition.

[0091] Furthermore, in one embodiment, the defrosting duration is determined based on the defrosting duration t. Specifically, as shown in the duration determination strategy table below, the membership degree of the duration subset corresponding to different defrosting durations is calculated according to the fourth membership degree calculation function based on the defrosting duration t. Then, the defrosting duration corresponding to the highest membership degree of the duration subset is selected as the final determined defrosting duration. When multiple duration subsets have the same membership degree, the defrosting duration corresponding to the highest membership degree priority is selected as the final determined defrosting duration according to the membership degree priority from high to low (High>Medium>Low).

[0092]

[0093] Based on the fourth membership function corresponding to different defrosting durations, the membership degree of the duration subset corresponding to different defrosting durations is calculated according to the defrosting duration t. Specifically, this may include: selecting a fourth membership function from the fourth membership function corresponding to "defrosting time too short" based on the range of t, and calculating the membership degree of the duration subset corresponding to "defrosting time too short". From the fourth membership function corresponding to "normal defrosting time", select one fourth membership function based on the range of t to calculate the membership degree of the duration subset corresponding to "normal defrosting time". From the fourth membership function corresponding to "excessive defrosting time", select one fourth membership function based on the range of t to calculate the membership degree of the duration subset corresponding to "excessive defrosting time". .

[0094] Then, the defrost duration corresponding to the highest duration subset membership degree is selected as the final defrost duration, i.e., the duration calculated from the given data. , , Select the highest membership degree of the duration subset, and use the defrosting duration corresponding to the highest membership degree of the duration subset as the final defrosting duration. For example, the highest membership degree of the duration subset is... The final defrosting time is then determined as the "normal defrosting time".

[0095] Furthermore, if the calculated , , When they are equal, select the subset with the highest membership priority (i.e., the one with the highest membership priority) in descending order of membership priority (Long > Medium > Short). ), and will The corresponding defrosting time condition, "defrosting time too long," will be used as the final defrosting time condition.

[0096] The parameters in the parameter range in the table above can be set according to the actual situation. For example, in a preferred embodiment, the parameters... , Set to 0, parameter , Set to ∞; parameter < and > ,parameter < and > ,parameter < and > ,parameter < and > ;parameter > > ,parameter > > The "Function Type" column in the table above also describes the types of the third membership calculation function and the fourth membership calculation function.

[0097] In the exit action table, preset exit actions can be set for different combinations of defrosting speed and defrosting duration. Based on the defrosting speed and defrosting duration determined in this case, the corresponding preset exit action (i.e., the defrosting exit action determined in this case) can be accurately determined from the exit action table.

[0098] In one specific implementation, the exit action table is shown in the table below.

[0099]

[0100] Among them, Slow3, Normal3, and Fast3 correspond to slow defrosting speed, normal defrosting speed, and extremely fast defrosting speed, respectively; Short4, Medium4, and Long4 correspond to excessively short defrosting time, normal defrosting time, and excessively long defrosting time, respectively.

[0101] To facilitate better implementation of the control method for the air source heat pump unit provided in the embodiments of this application, the above embodiments are further described below with reference to a defrosting scenario. This defrosting scenario uses the aforementioned embodiments of this application to control the air source heat pump unit. The meanings of the terms used are the same as in the control method for the air source heat pump unit described above, and specific implementation details can be found in the descriptions in the method embodiments.

[0102] like Figure 3 A flowchart illustrating the determination of the pre-defrosting unit in this defrosting scenario is shown. Figure 4 A flowchart illustrating the unit's coordinated control during this defrosting scenario is shown. Figure 5 The flowchart of the defrost exit control in this defrost scenario is shown.

[0103] First, such as Figure 3 The process for determining the pre-defrosting unit may include steps S310 to S340.

[0104] Step S310, Unit condition monitoring and analysis. Specifically, calculate and analyze the frost unevenness coefficient. Temperature difference Fan power change rate ; Step S320, Determine , , Does the preset allocation condition meet? Specifically, when... Greater than or equal to A, and any air source heat pump unit Greater than or equal to and If the value is greater than or equal to C, then the preset allocation condition is met. Step S330: Calculate the defrosting priority. Specifically, according to the formula... Calculate the priority coefficient corresponding to the i-th air source heat pump unit. Priority coefficient The higher the priority, the higher the defrosting priority.

[0105] Step S340: Based on the defrosting priority, determine the standby defrosting units and the heat compensation standby units. Specifically, the air source heat pump unit corresponding to the highest defrosting priority is determined as the standby defrosting unit, and the heat compensation standby units include the remaining air source heat pump units excluding the standby defrosting units.

[0106] Furthermore, such as Figure 4 The process of unit coordinated control shown may include steps S410 to S450.

[0107] Step S410: Determine the frost thickness value F of the pre-defrosting unit. Specifically, it can be determined according to the formula... The frost thickness value F is calculated.

[0108] Step S420: Calculate the heat load deficit value H. Specifically, this can be done according to the formula... The heat load gap value H was calculated.

[0109] Step S430: Calculate the membership degree based on the frost thickness value F to obtain the degree of frost corresponding to the membership degree of the frost subset to which the frost thickness value F belongs. Specifically, the degree of frost can be determined based on the frost thickness value F by referring to the frost determination strategy table in the foregoing embodiments of this application.

[0110] Step S440: Calculate the membership degree based on the heat load gap value H to obtain the heating capacity state corresponding to the membership degree of the state subset to which the heat load gap value H belongs. Specifically, the heating capacity state can be determined based on the heat load gap value H, referring to the state determination strategy table in the foregoing embodiments of this application.

[0111] Step S450: Determine the defrost control action based on the degree of frost formation and the heating status. Specifically, refer to the defrost action table above. Based on the degree of frost formation and the heating status determined this time, the corresponding preset control action (i.e., the defrost control action determined this time) can be accurately determined from the defrost action table.

[0112] Furthermore, such as Figure 5 The defrost exit control process shown may include steps S510 to S550.

[0113] Step S510: Determine the evaporator temperature recovery rate R of the pre-defrosting unit.

[0114] Step S520: Determine the defrosting duration t of the pre-defrosting unit.

[0115] Step S530: Calculate the membership degree based on the evaporator temperature rise rate R to obtain the defrosting speed corresponding to the membership degree of the speed subset to which the evaporator temperature rise rate R belongs. Specifically, the defrosting speed can be determined based on the speed determination strategy table in the aforementioned embodiments of this application, according to the evaporator temperature rise rate R.

[0116] Step S540: Calculate the membership degree based on the defrosting duration t to obtain the defrosting duration corresponding to the membership degree of the duration subset to which the defrosting duration t belongs. Specifically, the defrosting duration can be determined based on the duration t, referring to the duration determination strategy table in the foregoing embodiments of this application.

[0117] Step S550: Determine the defrost exit action based on the defrost duration and defrost speed. Specifically, refer to the exit action table above. Based on the defrost duration and defrost speed determined this time, the corresponding preset exit action (i.e., the defrost exit action determined this time) can be accurately determined from the exit action table.

[0118] In this scenario, by applying the aforementioned embodiments of this application to perform collaborative defrosting control of air source heat pump units, a standby defrosting unit and a heat compensation standby unit are determined from multiple air source heat pump units. The frost thickness value reflects the frost thickness of the evaporator of the standby defrosting unit, and the heat load gap value reflects the shortage between the heating capacity of the heat compensation standby unit and the total required heating capacity. By combining the frost thickness value and the heat load gap value, both the frost condition and the heating capacity shortage can be taken into account to determine the appropriate defrosting control action. According to the defrosting control action, multiple air source heat pump units are collaboratively controlled. In the scenario of multiple air source heat pump units operating collaboratively for heating, the heat supply effect can be improved while taking into account both improving defrosting reliability and reducing defrosting energy consumption.

[0119] To facilitate better implementation of the control method for air source heat pump units provided in the embodiments of this application, the embodiments of this application also provide a control device for air source heat pump units based on the above-described control method. The meanings of the terms used are the same as in the control method for air source heat pump units described above, and specific implementation details can be found in the descriptions in the method embodiments. Figure 6 A block diagram of a control device for an air source heat pump unit according to an embodiment of this application is shown.

[0120] like Figure 6As shown, the control device 600 for the air source heat pump unit may include: a unit allocation module 610, which can be used to: determine the standby defrosting unit and the heat compensation standby unit from multiple air source heat pump units; a frosting determination module 620, which can be used to: determine the frosting thickness value of the standby defrosting unit; a heating analysis module 630, which can be used to: calculate the heat load gap value based on the required heating capacity and the available heating capacity of the heat compensation standby unit; and an action determination module 640, which can be used to: determine the defrosting control action based on the frosting thickness value and the heat load gap value, so as to coordinately control the multiple air source heat pump units according to the defrosting control action.

[0121] In one embodiment, when determining the standby defrosting unit and the heat compensation standby unit from multiple air source heat pump units, the unit allocation module 610 can be used to: calculate the frosting unevenness coefficient of the multiple air source heat pump units based on the unit status data of the multiple air source heat pump units; determine whether the frosting unevenness coefficient and the unit status data meet preset allocation conditions; if the preset allocation conditions are met, then determine the standby defrosting unit and the heat compensation standby unit from the multiple air source heat pump units.

[0122] In one embodiment, the unit status data includes inlet air temperature and evaporator surface temperature; when calculating the frosting unevenness coefficient of the multiple air source heat pump units based on the unit status data, the unit allocation module 610 can be used to: calculate the temperature drop rate of the evaporator of each air source heat pump unit based on the inlet air temperature and the evaporator surface temperature of each air source heat pump unit; calculate the average temperature drop rate based on the average temperature drop rate of the multiple air source heat pump units; and calculate the frosting unevenness coefficient based on the average temperature drop rate and the temperature drop rate of the multiple air source heat pump units.

[0123] In one embodiment, the unit status data includes the temperature difference between the inlet air temperature and the evaporator surface temperature, and the fan power change rate; when determining whether the frosting unevenness coefficient and the unit status data meet the preset allocation conditions, the unit allocation module 610 can be used to: determine that the preset allocation conditions are met when the frosting unevenness coefficient is greater than or equal to the preset coefficient, and the temperature difference of any one of the air source heat pump units is greater than or equal to the lower limit difference and the fan power change rate is greater than or equal to the preset change rate.

[0124] In one embodiment, when determining the pre-defrosting unit and the heat compensation pre-defrosting unit from multiple air source heat pump units, the unit allocation module 610 can be used to: determine the defrosting priority of each air source heat pump unit; determine the air source heat pump unit corresponding to the highest defrosting priority as the pre-defrosting unit, and the heat compensation pre-defrosting unit includes the remaining air source heat pump units excluding the pre-defrosting unit.

[0125] In one embodiment, when determining the defrosting priority of each of the air source heat pump units, the unit allocation module 610 can be used to: calculate the required heating capacity based on the heating area, target temperature, and outdoor ambient temperature; calculate the total output heating capacity of the remaining air source heat pump units after excluding each of the air source heat pump units, to obtain the total output heating capacity corresponding to each air source heat pump unit; determine the maximum temperature drop rate from the temperature drop rates of the evaporators of the multiple air source heat pump units; and calculate the priority coefficient corresponding to each air source heat pump unit based on the required heating capacity, the maximum temperature drop rate, the total output heating capacity corresponding to each air source heat pump unit, and the temperature drop rate, wherein the higher the priority coefficient, the higher the defrosting priority.

[0126] In one embodiment, when determining the frost thickness value of the pre-defrosting unit, the frost determination module 620 can be used to: calculate the pressure difference ratio between the air-side pressure difference of the evaporator in the pre-defrosting unit and the reference pressure difference; and determine the pressure difference ratio as the frost thickness value.

[0127] In one embodiment, when calculating the heat load gap value based on the required heating capacity and the available heating capacity of the heat compensation reserve unit, the heating analysis module 630 can be used to: subtract the available heating capacity from the required heating capacity to obtain a heating capacity difference; and divide the heating capacity difference by the required heating capacity to obtain the heat load gap value.

[0128] In one embodiment, when determining the defrost control action based on the frost thickness value and the heat load gap value, the action determination module 640 can be used to: determine the degree of frost based on the frost thickness value; determine the heating state based on the heat load gap value; and determine the preset control action corresponding to the degree of frost and the heating state as the defrost control action.

[0129] In one embodiment, the defrosting control action includes increasing the compressor frequency of the heat compensation reserve unit to a target frequency; the device further includes a frequency adjustment module that can be used to: when the heat load deficit value is greater than a preset deficit value, the target frequency is equal to a predetermined first frequency; when the heat load deficit value is less than or equal to the preset deficit value, the target frequency is calculated based on the heat load deficit value and preset parameters.

[0130] In one embodiment, after determining the defrost control action based on the frost thickness value and the heat load gap value, the device further includes an exit control module that can be used to: determine the evaporator temperature recovery rate and defrost duration of the pre-defrost unit when the pre-defrost unit is defrosting; determine the defrost exit action based on the evaporator temperature recovery rate and the defrost duration; and control the pre-defrost unit to exit defrosting based on the defrost exit action.

[0131] In one embodiment, when determining the defrost exit action based on the evaporator temperature recovery rate and the defrost duration, the exit control module can be used to: determine the defrost speed based on the evaporator temperature recovery rate; determine the defrost duration based on the defrost duration; and determine the preset exit action corresponding to the defrost speed and the defrost duration as the defrost exit action.

[0132] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0133] Furthermore, embodiments of this application also provide an electronic device, such as... Figure 7 As shown, Figure 7 A block diagram of an electronic device according to an embodiment of this application is shown, specifically: The electronic device may include components such as a processor 701 with one or more processing cores, a memory 702 with one or more computer-readable storage media, a power supply 703, and an input unit 704. Those skilled in the art will understand that... Figure 7 The electronic device structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein: The processor 701 is the control center of the electronic device, connecting various parts of the computer device via various interfaces and lines. It executes various functions and processes data by running or executing software programs and / or modules stored in the memory 702, and by calling data stored in the memory 702. Optionally, the processor 701 may include one or more processing cores; preferably, the processor 701 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user page, and application programs, and the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 701.

[0134] The memory 702 can be used to store software programs and modules. The processor 701 executes various functional applications and data processing by running the software programs and modules stored in the memory 702. The memory 702 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 702 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 702 may also include a memory controller to provide the processor 701 with access to the memory 702.

[0135] The electronic device also includes a power supply 703 that supplies power to the various components. Preferably, the power supply 703 can be logically connected to the processor 701 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 703 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0136] The electronic device may also include an input unit 704, which can be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0137] Although not shown, the electronic device may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 701 in the electronic device can load the executable files corresponding to the processes of one or more computer programs into the memory 702 according to the following instructions, and the processor 701 runs the computer programs stored in the memory 702, thereby realizing the various functions in the foregoing embodiments of this application.

[0138] For example, processor 701 can perform the following actions: determine a pre-defrosting unit and a heat compensation pre-defrosting unit from multiple air source heat pump units; determine the frost thickness value of the pre-defrosting unit; calculate the heat load gap value based on the required heating capacity and the available heating capacity of the heat compensation pre-defrosting unit; and determine a defrosting control action based on the frost thickness value and the heat load gap value, so as to coordinately control the multiple air source heat pump units according to the defrosting control action.

[0139] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by a computer program, or by a computer program controlling related hardware. The computer program can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0140] Therefore, embodiments of this application also provide a storage medium storing a computer program that can be loaded by a processor to execute the steps in any of the methods provided in embodiments of this application.

[0141] The storage medium can be a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0142] Since the computer program stored in the storage medium can execute the steps of any of the methods provided in the embodiments of this application, the beneficial effects that the methods provided in the embodiments of this application can achieve can be realized. For details, please refer to the previous embodiments, which will not be repeated here.

[0143] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0144] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0145] It should be understood that this application is not limited to the embodiments described above and shown in the accompanying drawings, but various modifications and changes can be made without departing from its scope.

Claims

1. A control method for an air source heat pump unit, characterized in that, include: Select backup defrosting units and backup heat compensation units from multiple air source heat pump units; Determine the frost thickness value of the pre-defrosting unit; The heat load deficit value is obtained by calculating based on the required heating capacity and the available heating capacity of the heat compensation reserve unit. Based on the frost thickness value and the heat load gap value, a defrosting control action is determined to coordinate the control of the multiple air source heat pump units in accordance with the defrosting control action.

2. The method according to claim 1, characterized in that, The process of identifying standby defrosting units and heat compensation standby units from multiple air source heat pump units includes: The frosting unevenness coefficient of the multiple air source heat pump units is obtained by calculating based on the unit status data of the multiple air source heat pump units. Determine whether the frost unevenness coefficient and the unit status data meet the preset allocation conditions; If the preset allocation conditions are met, the standby defrosting unit and the heat compensation standby unit are determined from multiple air source heat pump units.

3. The method according to claim 2, characterized in that, The unit status data includes inlet air temperature and evaporator surface temperature; The calculation based on the unit status data of the multiple air source heat pump units yields the frosting unevenness coefficient of the multiple air source heat pump units, including: The temperature drop rate of the evaporator of each air source heat pump unit is calculated based on the inlet air temperature and the evaporator surface temperature of each unit. The average temperature drop rate is obtained by averaging the temperature drop rates corresponding to the multiple air source heat pump units. The frost unevenness coefficient is obtained by calculating based on the average temperature drop rate and the temperature drop rate corresponding to the multiple air source heat pump units.

4. The method according to claim 2, characterized in that, The unit status data includes the temperature difference between the inlet air temperature and the evaporator surface temperature, and the fan power change rate. Determining whether the frost unevenness coefficient and the unit status data meet the preset allocation conditions includes: When the frost unevenness coefficient is greater than or equal to the preset coefficient, and the temperature difference of any one of the air source heat pump units is greater than or equal to the lower limit difference and the fan power change rate is greater than or equal to the preset change rate, then the preset allocation condition is determined to be met.

5. The method according to claim 2, characterized in that, The step of determining the standby defrosting unit and the heat compensation standby unit from multiple air source heat pump units includes: Determine the defrosting priority for each of the aforementioned air source heat pump units; The air source heat pump unit corresponding to the highest defrosting priority is identified as the pre-defrosting unit, and the heat compensation pre-defrosting unit includes the remaining air source heat pump units excluding the pre-defrosting unit.

6. The method according to claim 5, characterized in that, Determining the defrosting priority of each of the air source heat pump units includes: The required heating capacity is calculated based on the area of ​​the heating zone, the target temperature, and the outdoor ambient temperature. Calculate the total output heating capacity of the remaining air source heat pump units after excluding each of the air source heat pump units, and obtain the total output heating capacity corresponding to each air source heat pump unit. The maximum temperature drop rate is determined from the temperature drop rates of the evaporators of the multiple air source heat pump units described above; The priority coefficient for each air source heat pump unit is calculated based on the required heating capacity, the maximum temperature drop rate, the total output heating capacity and the temperature drop rate for each air source heat pump unit. The higher the priority coefficient, the higher the defrosting priority.

7. The method according to claim 1, characterized in that, Determining the frost thickness value of the pre-defrosting unit includes: Calculate the pressure difference ratio between the air-side pressure difference and the reference pressure difference in the pre-defrosting unit; The pressure difference ratio is determined as the frost thickness value.

8. The method according to claim 1, characterized in that, The calculation based on the required heating capacity and the available heating capacity of the heat compensation reserve unit yields the heat load deficit value, including: Subtract the available heating capacity from the required heating capacity to obtain the heating capacity difference; Divide the difference in heating capacity by the required heating capacity to obtain the heat load deficit value.

9. The method according to claim 1, characterized in that, The step of determining the defrost control action based on the frost thickness value and the heat load gap value includes: The degree of frost is determined based on the frost thickness value; The heating capacity status is determined based on the aforementioned heat load deficit value; The preset control actions corresponding to the degree of frost formation and the heating state are determined as the defrosting control actions.

10. The method according to claim 9, characterized in that, The defrosting control action includes increasing the compressor frequency of the heat compensation standby unit to a target frequency; Wherein, when the heat load deficit value is greater than the preset deficit value, the target frequency is equal to the predetermined first frequency; When the heat load gap value is less than or equal to the preset gap value, the target frequency is calculated based on the heat load gap value and the preset parameters.

11. The method according to any one of claims 1 to 10, characterized in that, After determining the defrost control action based on the frost thickness value and the heat load gap value, the method further includes: When the pre-defrosting unit is defrosting, the evaporator temperature recovery rate and the defrosting duration of the pre-defrosting unit are determined; The defrost exit action is determined based on the evaporator temperature recovery rate and the defrost duration; The defrosting unit is controlled to exit defrosting according to the defrosting exit action.

12. The method according to claim 11, characterized in that, The step of determining the defrost exit action based on the evaporator temperature recovery rate and the defrost duration includes: The defrosting speed is determined based on the evaporator temperature recovery rate. The defrosting duration is determined based on the defrosting duration. The preset exit actions corresponding to the defrosting speed and defrosting duration are determined as the defrosting exit actions.

13. A control device for an air source heat pump unit, characterized in that, include: The unit allocation module is used to: determine the standby defrosting unit and the heat compensation standby unit from multiple air source heat pump units; The frost determination module is used to: determine the frost thickness value of the pre-defrosting unit; The heating analysis module is used to calculate the heat load gap value based on the required heating capacity and the available heating capacity of the heat compensation reserve unit. The action determination module is used to: determine the defrost control action based on the frost thickness value and the heat load gap value, so as to coordinate the control of the multiple air source heat pump units according to the defrost control action.

14. A storage medium, characterized in that, It stores a computer program that, when executed by the processor of the electronic device, causes the electronic device to perform the method described in any one of claims 1 to 12.

15. An electronic device, characterized in that, include: Memory, which stores computer programs; A processor reads a computer program stored in memory to execute the method according to any one of claims 1 to 12.

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