Control method for heat pump unit, heat pump unit and storage medium

Abstract

A control method for a heat pump unit (100), the heat pump unit (100) and a storage medium. The method comprises: when it is determined that an intended operating mode of the heat pump unit (100) is a cooling and domestic hot water mode, determining a target operating mode of the heat pump unit (100) according to a first demand determination strategy, and controlling the heat pump unit (100) to operate in the target operating mode, the target operating mode comprising any one of a cooling mode and a cooling and domestic hot water mode; after the target operating mode of the heat pump unit (100) is determined, on the basis of a pre-stored capability calculation mapping table, calculating a target output frequency in the target operating mode; and then, the heat pump unit (100) controlling a compressor (101) to operate according to the target output frequency. When it is determined that the intended operating mode of the heat pump unit (100) is the cooling and domestic hot water mode, the target operating mode of the heat pump unit (100) is determined according to the first demand determination strategy, so as to control the heat pump unit (100) to operate in the target operating mode, thus reducing energy consumption.

Description

Heat pump unit control method, heat pump unit and storage medium

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 31, 2023, with application number 202311442857.4, and invention name “Control method of heat pump unit, heat pump unit and storage medium”, all contents of which are incorporated by reference in this application. Technical Field

[0002] The present application relates to the technical field of heat pump units, and in particular to a control method for a heat pump unit, a heat pump unit, and a storage medium. Background Art

[0003] Traditional air conditioning and hot water systems use separate equipment, making it difficult to effectively utilize energy. With the development of heat pump technology and the need for environmental protection, heat pumps that can provide both cooling and hot water, more efficiently utilize renewable energy, and have lower carbon emissions, are becoming increasingly popular.

[0004] When traditional heat pump units provide cooling and domestic hot water functions, they are usually directly controlled to operate at a high frequency, resulting in excessive energy consumption during operation.

[0005] Summary of the Invention

[0006] In view of this, the present application provides a control method for a heat pump unit, a heat pump unit and a storage medium to solve the problem of excessive energy consumption when directly controlling the heat pump unit to operate at a high frequency when providing refrigeration and domestic hot water functions.

[0007] A first aspect of an embodiment of the present application provides a control method for a heat pump unit, wherein the heat pump unit includes a compressor, and the control method includes: setting the standby operating mode of the heat pump unit to a cooling and hot water mode; determining a target operating mode of the heat pump unit according to a first demand judgment strategy, wherein the target operating mode includes any one of a cooling mode and a cooling and hot water mode; calculating a target output frequency under the target operating mode based on a pre-stored capacity calculation mapping table, and controlling the compressor to operate according to the target output frequency.

[0008] In some embodiments, the target operating mode of the heat pump unit is determined according to the first demand judgment strategy, including: if the heat pump unit has a cooling demand, and the hot water temperature, hot water inlet temperature and exhaust temperature of the heat pump unit all meet the first condition, determining that the target operating mode is a cooling plus domestic hot water mode.

[0009] In some embodiments, determining the target operating mode of the heat pump unit according to the first demand judgment strategy includes: if the heat pump unit does not have the cooling demand and the hot water temperature and the hot water inlet temperature both meet the first condition, controlling the heat pump unit not to start.

[0010] In some embodiments, the control method further includes: obtaining the cooling target temperature, air-conditioning side outlet water temperature and startup temperature difference of the heat pump unit; if it is determined that the air-conditioning side outlet water temperature is greater than or equal to the sum of the cooling target temperature and the startup temperature difference within a preset time length, it is determined that the heat pump unit has the cooling demand; if it is determined that the air-conditioning side outlet water temperature is less than the sum of the cooling target temperature and the startup temperature difference within the preset time length, it is determined that the heat pump unit does not have the cooling demand.

[0011] In some embodiments, the target output frequency under the target operating mode is calculated based on a pre-stored capacity calculation mapping table, including: obtaining the air-conditioning side outlet water temperature and the cooling target temperature of the heat pump unit in the current operating cycle; determining the target temperature difference based on the air-conditioning side outlet water temperature and the cooling target temperature; determining the target temperature difference change rate based on the target temperature difference and the historical temperature difference, the historical temperature difference being the temperature difference of the previous operating cycle of the current operating cycle; matching the target frequency adjustment parameter from the capacity calculation mapping table based on the target temperature difference and the target temperature difference change rate; and calculating the target output frequency of the current operating cycle based on the target frequency adjustment parameter and the historical output frequency of the previous operating cycle.

[0012] In some embodiments, the control method further includes: switching the target operating mode according to a second demand judgment strategy, the target operating mode including any one of a cooling mode, a cooling plus domestic hot water mode, a standby mode, an alarm shutdown mode and an electric heating mode.

[0013] In some embodiments, switching the target operating mode according to the second demand judgment strategy includes: switching the target operating mode if any of the following conditions is met: within a first time period, the hot water outlet temperature of the heat pump unit is greater than a first temperature threshold; within a second time period, the difference between the exhaust temperature and the hot water inlet temperature of the heat pump unit is less than a second temperature threshold; within a third time period, the hot water inlet temperature of the heat pump unit is greater than a third temperature threshold; the air-conditioning side outlet water temperature of the heat pump is less than the sum of the cooling target temperature of the heat pump and the shutdown temperature difference.

[0014] In some embodiments, switching the target operating mode according to the second demand judgment strategy includes: if it is determined that the hot water temperature of the heat pump unit is less than a fourth temperature threshold, switching the target operating mode to an electric heating mode.

[0015] A second aspect of an embodiment of the present application provides a control device for a heat pump unit, wherein the heat pump unit includes a compressor, and the control device includes: a setting module for setting the standby operating mode of the heat pump unit to a cooling and hot water mode; a determination module for determining a target operating mode of the heat pump unit according to a first demand judgment strategy, wherein the target operating mode includes any one of a cooling mode and a cooling and hot water mode; a control module for calculating a target output frequency under the target operating mode based on a pre-stored capacity calculation mapping table, and controlling the compressor to operate according to the target output frequency.

[0016] A third aspect of an embodiment of the present application provides a heat pump unit, comprising a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, wherein the processor implements the control method of the heat pump unit when executing the computer-readable instructions.

[0017] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by a processor, the control method of the heat pump unit is implemented.

[0018] In a control method for a heat pump unit provided in an embodiment of the present application, when the heat pump unit determines that the standby operating mode of the heat pump unit is the cooling plus domestic hot water mode, the target operating mode of the heat pump unit is determined according to the first demand judgment strategy, and the heat pump unit is controlled to operate according to the target operating mode. The target operating mode includes any one of the cooling mode and the cooling plus domestic hot water mode. In order to ensure the stable operation of the heat pump unit and improve the operating efficiency of the heat pump unit, after the heat pump unit determines the target operating mode, it calculates the target output frequency under the target operating mode based on a pre-stored capacity calculation mapping table. Then, the heat pump unit controls the compressor to operate according to the target output frequency. By determining that the standby operating mode of the heat pump unit is the cooling plus domestic hot water mode, the target operating mode of the heat pump unit is determined according to the first demand judgment strategy, and the heat pump unit is controlled to operate according to the target operating mode, energy consumption can be saved, and damage to the heat pump unit due to overload, etc., which affects the working efficiency of the heat pump unit, can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] FIG1 is an example diagram of refrigerant operation in a cooling and domestic hot water mode provided in an embodiment of the present application;

[0021] FIG2 is an example diagram of refrigerant operation in the cooling mode provided in an embodiment of the present application;

[0022] FIG3 is a flow chart of an implementation method of a heat pump unit control method provided in an embodiment of the present application;

[0023] FIG4 is an exemplary diagram of the implementation principle of the control method for a heat pump unit provided in an embodiment of the present application;

[0024] FIG5 is a schematic structural diagram of a control device for a heat pump unit provided in an embodiment of the present application;

[0025] FIG6 is a schematic structural diagram of a heat pump unit provided in an embodiment of the present application.

[0026] Key component symbols: heat pump unit 100; compressor 101; domestic hot water heat exchanger 102; enthalpy increase module 103; first throttling element 1031; economizer 1032; second throttling element 1033; condenser 104; air conditioning side heat exchanger 105; domestic hot water tank 10; liquid storage tank 20; gas-liquid separator 30; air conditioning tank 40; first three-way valve 50; first interface 501 of the first three-way valve; second interface 502 of the first three-way valve Port 502; third port 503 of the first three-way valve; second three-way valve 51; first port 511 of the second three-way valve; second port 512 of the second three-way valve; third port 513 of the second three-way valve; four-way valve 60; first temperature sensor 70; second temperature sensor 71; third temperature sensor 72; fourth temperature sensor 73; fifth temperature sensor 74; several one-way valves 80 to 86; first water pump 90; second water pump 91. DETAILED DESCRIPTION

[0027] It should be noted that the terms "first" and "second" in the description, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0028] It should also be noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart includes one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchanged with each other, and some steps can also be deleted.

[0029] The following will describe some embodiments with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0030] In some embodiments, the heat pump system is a whole system composed of a heat pump unit, a terminal water system, etc. Among them, the heat pump unit is the most core part of the heat pump system, responsible for the transfer and conversion of heat energy. The heat pump unit is usually composed of a compressor, an evaporator, a condenser, a throttling device (for example, an expansion valve), a refrigerant pipeline, a liquid storage tank, a gas-liquid separator, a domestic hot water tank and other equipment. The heat pump unit can realize a variety of operating modes, such as domestic hot water mode, cooling mode, heating mode, cooling plus domestic hot water mode, heating plus domestic hot water mode, etc. An embodiment of the present application provides a control method for a heat pump unit when the operating mode of the heat pump unit is set to cooling and domestic hot water mode.

[0031] In some embodiments, the heat pump unit may further include a control device, through which the heat pump unit can control the operating mode, the output frequency of the compressor, temperature detection, etc.

[0032] In the embodiment provided in the present application, when the operating mode of the heat pump unit is the cooling plus domestic hot water mode, the heat pump unit absorbs heat from the low-temperature renewable energy source and uses it for cooling and preparing domestic hot water. The preparation of domestic hot water involves, during the cooling process of the heat pump unit, the high-temperature refrigerant processed by the compressor flowing through the domestic hot water heat exchanger before flowing into the condenser, or the high-temperature refrigerant is divided into two branches, with part of the high-temperature refrigerant flowing directly into the condenser through one branch and part of the high-temperature refrigerant flowing into the domestic hot water heat exchanger through the other branch. Heat exchange between the domestic hot water and the high-temperature refrigerant is achieved through the domestic hot water heat exchanger, thereby achieving full utilization of the heat of the high-temperature refrigerant during the cooling process and preventing this heat from being dissipated into the air through the condenser, causing energy waste.

[0033] Please refer to Figure 1, which is an example diagram of the refrigerant operation in the cooling and domestic hot water mode provided in an embodiment of the present application. Figure 1 shows a partial structural example diagram of the heat pump unit provided in an embodiment of the present application. As shown in Figure 1, the heat pump unit includes a compressor 101, a domestic hot water heat exchanger 102, an enthalpy increase module 103, a condenser 104, an air conditioning side heat exchanger 105, etc. In addition to the heat pump unit, the heat pump unit also includes auxiliary equipment such as a domestic hot water tank 10, a liquid storage tank 20, a gas-liquid separator 30, an air conditioning tank 40, a first water pump 90, a second water pump 91, a first temperature sensor 70, a second temperature sensor 71, a third temperature sensor 72, a fourth temperature sensor 73, and a fifth temperature sensor 74, as well as components such as a first three-way valve 50, a second three-way valve 51, a four-way valve 60, and several one-way valves 80-86.

[0034] In some embodiments, the heat pump unit, auxiliary equipment, and various components in the heat pump unit 100 can be connected via pipes. For example, the compressor 101 and the domestic hot water heat exchanger 102 are connected via a refrigerant pipe, the domestic hot water heat exchanger 102 and the domestic hot water tank 10 can be connected via a hot water pipe, and the air conditioning side heat exchanger 105 and the air conditioning water tank 40 can be connected via a condensing pipe.

[0035] In some embodiments, the compressor 101 is used to compress low-temperature, low-pressure gaseous refrigerant into high-temperature, high-pressure gaseous refrigerant. The domestic hot water heat exchanger 102 is used to exchange heat with the domestic hot water tank 10, heating the water in the tank to produce domestic hot water. In some embodiments, the enthalpy increase module 103 may include, for example, an economizer 1032, a first throttling element 1031, and a second throttling element 1033. These elements work together to achieve an enthalpy increase effect. The economizer 1032 is used to recover waste heat from the refrigerant. The first and second throttling elements 1031 and 1033 achieve a throttling effect by restricting the cross-sectional area of ​​the refrigerant flow. When the refrigerant passes through the throttling elements, its velocity increases and its pressure decreases, resulting in an increase in enthalpy. Therefore, the economizer 1032, the first throttling element 1031, and the second throttling element 1033 together can achieve the function of the enthalpy increase module 103. Condenser 104 cools the refrigerant, converting it from a gaseous state to a liquid state, releasing heat. Air-conditioning-side heat exchanger 105 can be an evaporator, which absorbs heat from the water in air-conditioning water tank 40, cooling the water therein to form low-temperature water. Simultaneously, heat from the water in air-conditioning water tank 40 is absorbed by air-conditioning-side heat exchanger 105, evaporating the liquid refrigerant flowing into air-conditioning-side heat exchanger 105 into a gaseous state. Liquid storage tank 20 can be used to store liquid refrigerant and balance the pressure of heat pump unit 100. Gas-liquid separator 30 can store some of the refrigerant in the system to prevent compressor slugging and excessive refrigerant dilution of the compressor oil.

[0036] In some embodiments, the first temperature sensor 70 is used to detect the exhaust temperature AI1, the second temperature sensor 71 is used to detect the hot water outlet temperature AI2, the third temperature sensor 72 is used to detect the hot water temperature AI3, the fourth temperature sensor 73 is used to detect the hot water inlet temperature AI4, and the fifth temperature sensor 74 is used to detect the air conditioning side outlet water temperature AI5. The first three-way valve 50 is respectively provided with a first port 501, a second port 502, and a third port 503 of the first three-way valve, and the second three-way valve 51 is respectively provided with a first port 511, a second port 512, and a third port 513 of the second three-way valve. The third port 503 of the first three-way valve 50 and the second port 502 of the first three-way valve 50 connect the refrigerant pipeline between the domestic hot water heat exchanger 102 and the exhaust port of the compressor 101. The first port 501 of the first three-way valve 50 and the third port 503 of the first three-way valve 50 connect the refrigerant pipeline between the four-way valve 60 and the exhaust port of the compressor 101. The first port 511 of the second three-way valve 51 and the third port 513 of the second three-way valve 51 connect the refrigerant pipeline between the domestic hot water heat exchanger 102 and the four-way valve 60. The third port 513 of the second three-way valve 51 and the second port 512 of the second three-way valve 51 connect the refrigerant pipeline between the air conditioning side heat exchanger 105 and the domestic hot water heat exchanger 102. In addition, the multiple one-way valves 80-86 in the heat pump unit 100 can be used to control the forward and reverse flow of the refrigerant, so that the refrigerant can only flow in a certain specified direction. The first water pump 90 between the domestic hot water heat exchanger 102 and the domestic hot water tank 10 can be used to circulate water between the domestic hot water heat exchanger 102 and the domestic hot water tank 10 to achieve heat transfer. The second water pump 91 between the air conditioning side heat exchanger 105 and the air conditioning water tank 40 can be used to circulate water between the air conditioning side heat exchanger 105 and the air conditioning water tank 40 to achieve heat transfer.

[0037] In some embodiments, the second port 502 and the third port 503 of the first three-way valve 50 are open, and the first port 501 of the first three-way valve 50 is closed, which is referred to as opening the first three-way valve 50; the first port 501 and the third port 503 of the first three-way valve 50 are open, and the second port 502 of the first three-way valve 50 is closed, which is referred to as closing the first three-way valve 50. Similarly, the second port 512 and the third port 513 of the second three-way valve 51 are open, and the first port 511 of the second three-way valve 51 is closed, which is referred to as opening the second three-way valve 51; the first port 511 and the third port 513 of the second three-way valve 51 are open, and the second port 512 of the second three-way valve 51 is closed, which is referred to as closing the second three-way valve 51.

[0038] In some embodiments, when the heat pump unit operates in cooling plus hot water mode, the first three-way valve 50 is controlled to open and the second three-way valve 51 is controlled to close during the cooling and hot water production processes. The refrigerant flow direction is indicated by the arrows in Figure 1 . At this time, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 101 flows through the second port 502 and the third port 503 of the first three-way valve 50 into the hot water heat exchanger 102. The hot water heat exchanger 102 is connected to the hot water tank 10. This allows the heat pump unit to use the condensation heat originally used for heat exchange with the air to produce hot water during the cooling process. The refrigerant flowing out of the hot water heat exchanger 102 flows through the third port 513 and the first port 511 of the second three-way valve 51 into the condenser 104, where it further condenses the refrigerant to form liquid refrigerant. The liquid refrigerant flowing out of the condenser 104 is throttled by the economizer 1032 and the first throttling element 1031 in the enthalpy increase module 103 to form a low-temperature liquid refrigerant. The low-temperature liquid refrigerant then flows into the air-conditioning side heat exchanger 105. The air-conditioning side heat exchanger 105 absorbs the heat of the water in the air-conditioning water tank 40 to cool the water in the air-conditioning water tank 40, thereby forming low-temperature water. The low-temperature water exchanges heat with the indoor air, absorbs the heat in the indoor air, and reduces the indoor air temperature, thereby achieving the refrigeration function. At the same time, the air-conditioning side heat exchanger 105 absorbs the heat of the water in the air-conditioning water tank 40, which can cause the low-temperature liquid refrigerant flowing to the air-conditioning side heat exchanger 105 to evaporate into a gaseous refrigerant. The evaporated gaseous refrigerant is sucked into the compressor after passing through the four-way valve, forming a refrigeration cycle. The heat pump unit provided in the embodiment of the present application can prepare domestic hot water in the process of achieving the refrigeration function, avoiding the heat exchange between the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 101 and the air, which causes energy waste, and improves the working efficiency of the heat pump unit.

[0039] Please refer to Figure 2, which is an example diagram of the refrigerant operation in the cooling mode provided in an embodiment of the present application, wherein Figure 2 shows an example diagram of a partial structure of the heat pump unit provided in an embodiment of the present application.

[0040] In some embodiments, when the heat pump unit is operating in cooling mode, the heat pump unit can control the first three-way valve 50 to close and the second three-way valve 51 to open in the process of realizing the cooling function. The refrigerant flow direction when the heat pump unit is operating in cooling mode can be directed by the arrows as shown in Figure 2. At this time, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 101 can flow to the domestic hot water heat exchanger four-way valve 60 through the first interface 501 and the third interface 503 of the first three-way valve 50, and flow into the condenser 104 through the four-way valve 60. The high-temperature and high-pressure gaseous refrigerant exchanges heat with the external environment in the condenser 104, and the high-temperature and high-pressure gaseous refrigerant releases heat and condenses to form liquid refrigerant. The liquid refrigerant flowing out of the condenser 104 is throttled by the economizer 1032 and the first throttling element 1031 in the enthalpy increase module 103 to form a low-temperature liquid refrigerant. The low-temperature liquid refrigerant then flows into the air conditioning side heat exchanger 105. This absorbs heat from the water in the air conditioning water tank 40, cooling it to form low-temperature water. This low-temperature water then exchanges heat with the indoor air, absorbing heat from the air, lowering the indoor air temperature and achieving a cooling function. Simultaneously, the heat absorbed by the air conditioning side heat exchanger 105 causes the low-temperature liquid refrigerant flowing into the air conditioning side heat exchanger 105 to evaporate into a gaseous refrigerant. This evaporated gaseous refrigerant passes through the four-way valve and is then drawn into the compressor, completing the refrigeration cycle.

[0041] In some embodiments, the heat pump unit 100 may further include components such as a filter, a high-pressure sensor, a high-pressure protection switch, and a low-pressure sensor. The filter can be used to filter and remove impurities, contaminants, and solid particles from the refrigerant. The high-pressure sensor can be used to measure the high pressure of the heat pump unit. The high-pressure protection switch can be used to monitor the high pressure of the heat pump unit. When the high pressure exceeds a set safety range, the high-pressure protection switch automatically disconnects the circuit to prevent a possible dangerous situation. The low-pressure sensor can be used to measure the low pressure of the heat pump unit.

[0042] Please refer to Figure 3, which is a flowchart of the implementation of the control method of the heat pump unit provided in the embodiment of the present application. The embodiment of the present application uses the method applied to the heat pump unit 100 in Figure 1 or Figure 2 as an example to illustrate, including the following steps.

[0043] S11: Set the standby operation mode of the heat pump unit to cooling plus domestic hot water mode.

[0044] In some embodiments, the standby operation modes of the heat pump include but are not limited to heating mode, cooling mode, domestic hot water mode, cooling plus domestic hot water mode, and heating plus domestic hot water mode.

[0045] In some embodiments, a user can select a standby operating mode for the heat pump unit. For example, for a heat pump unit in an air conditioner, a display on the air conditioner can display various standby operating mode options for the air conditioner, such as a domestic hot water mode option, a cooling mode option, a heating mode option, a cooling plus domestic hot water mode option, a heating plus domestic hot water mode option, etc. In response to a user selecting the domestic hot water mode option and the cooling mode option, or in response to a user selecting the cooling plus domestic hot water mode option, the heat pump unit can determine that the standby operating mode of the heat pump unit is the cooling plus domestic hot water mode.

[0046] S12: Determine a target operating mode of the heat pump unit according to the first demand judgment strategy, where the target operating mode includes any one of a cooling mode and a cooling plus domestic hot water mode.

[0047] In some embodiments, the first demand determination strategy is to determine corresponding conditions of a target operating mode, wherein the target operating mode includes but is not limited to any one of a cooling and domestic hot water mode and a cooling mode.

[0048] In some embodiments, when the heat pump unit's standby operating mode is determined to be cooling plus hot water mode, this indicates that the user has a need for both cooling and hot water. However, it is possible that the cooling function currently provided by the heat pump unit can already meet the user's cooling need, or the hot water currently produced by the heat pump unit can already meet the user's hot water need, or the cooling function currently provided by the heat pump unit cannot meet the user's cooling need, and the hot water currently produced by the heat pump unit cannot meet the user's hot water need. In this case, continuing to control the heat pump unit to operate in cooling plus hot water mode may result in energy waste and increase operating costs. Therefore, to avoid this situation, when the heat pump unit's standby operating mode is determined to be cooling plus hot water mode, the heat pump unit can further determine a target operating mode for the heat pump unit. The target operating mode can be any of the following modes: cooling plus hot water mode, cooling mode, standby mode, electric heating mode, etc. By controlling the heat pump unit to operate according to the target operating mode, energy utilization efficiency can be improved.

[0049] As an example, in the summer, the standby mode of the heat pump unit is usually the cooling plus domestic hot water mode, which is mainly to meet the user's demand for cooling. As shown in the cooling plus domestic hot water mode example diagram in Figure 1, the domestic hot water is only when the heat pump is cooling. The refrigerant flowing to the condenser is controlled to flow to the domestic hot water heat exchanger in advance, so that domestic hot water is prepared while cooling, thereby achieving the effect of fully utilizing thermal energy. In this case, when it is determined that the standby mode of the heat pump unit is the cooling plus domestic hot water mode, if the cooling function provided by the heat pump unit can already meet the user's needs, it still responds to the setting of the standby mode and runs the cooling plus domestic hot water mode, which may cause the cooling temperature to be too low, affecting the user experience, and continuing to run the heat pump unit at this time will cause energy waste and increase operating costs.

[0050] In some embodiments of the present application, the target operating mode of the heat pump unit is determined according to the first demand judgment strategy, including: if there is a cooling demand for the heat pump unit, and the hot water temperature, hot water inlet temperature and exhaust temperature of the heat pump unit all meet the first condition, the target operating mode is determined to be the cooling plus domestic hot water mode.

[0051] In some embodiments, in the process of determining the target operating mode of the heat pump unit, the heat pump unit first determines whether the refrigeration function currently provided by the heat pump unit meets the user's demand for refrigeration, and then further determines whether the domestic hot water currently prepared by the heat pump unit meets the user's demand for domestic hot water, thereby determining the target operating mode of the heat pump unit.

[0052] In some embodiments, the presence of a cooling demand on the heat pump unit indicates that the cooling function currently provided by the heat pump unit cannot meet the user's cooling demand, and the heat pump unit may need to be activated to meet the user's cooling demand. To determine the target operating mode of the heat pump unit, it is also necessary to further determine whether the domestic hot water currently produced by the heat pump unit meets the user's domestic hot water demand.

[0053] In some embodiments, as shown in FIG1 , the heat pump unit may detect the exhaust temperature through a first temperature sensor, detect the hot water temperature through a third temperature sensor, and detect the hot water inlet temperature through a fourth temperature sensor.

[0054] In some embodiments, when the hot water temperature, hot water inlet temperature, and exhaust temperature of the heat pump unit all meet the first condition, it indicates that the domestic hot water produced by the heat pump unit cannot meet the user's domestic hot water demand (e.g., the domestic hot water temperature demand). If the heat pump unit has a cooling demand, and the hot water temperature, hot water inlet temperature, and exhaust temperature of the heat pump unit all meet the first condition, the heat pump unit can determine the target operating mode to be the cooling plus domestic hot water mode to meet the user's cooling and domestic hot water demands.

[0055] In some embodiments, the hot water temperature, hot water inlet temperature, and exhaust temperature of the heat pump unit all meet a first condition, including but not limited to: the hot water temperature is less than a first threshold, the hot water inlet temperature is less than a second threshold, and the exhaust temperature is greater than the sum of the hot water inlet temperature and a preset temperature parameter. The first threshold, the second threshold, and the preset temperature parameter can all be customized. For example, the first threshold can be set to 54°C, the second threshold can be set to 49°C, and the preset temperature parameter can be set to 8°C.

[0056] In some embodiments of the present application, if the heat pump unit has a cooling demand and the hot water temperature and the hot water inlet temperature do not meet the first condition, the target operating mode is determined to be the cooling mode.

[0057] In some embodiments, if both the hot water temperature and the hot water inlet temperature of the heat pump unit do not meet the first condition, it indicates that the domestic hot water produced by the heat pump unit may be able to meet the user's domestic hot water demand. In this case, domestic hot water production can be stopped. If it is determined that the heat pump unit has a cooling demand at this time, the heat pump unit can determine the target operating mode as cooling mode and only provide cooling function to meet the user's cooling demand.

[0058] In some embodiments, the hot water temperature and the hot water inlet temperature both failing to meet the first condition include: the hot water temperature being greater than or equal to a first threshold, and the hot water inlet temperature being greater than or equal to a second threshold. Both the first and second thresholds can be customized. For example, the first threshold can be set to 54°C, and the second threshold can be set to 49°C.

[0059] In some embodiments of the present application, the target operating mode of the heat pump unit is determined according to the first demand judgment strategy, including: if there is no cooling demand for the heat pump unit, and the hot water temperature and the hot water inlet temperature both meet the first condition, the heat pump unit is controlled not to start (for example, no response is made temporarily), and a judgment is made again when a cooling demand appears.

[0060] In some embodiments, the absence of cooling demand for the heat pump unit indicates that the cooling function provided by the heat pump unit can meet the user's cooling demand. The hot water temperature and the hot water inlet temperature both meet the first condition, indicating that the domestic hot water prepared by the heat pump unit cannot yet meet the user's domestic hot water demand. However, when the standby mode of the heat pump unit is set to the cooling plus domestic hot water mode, the main function is to meet the user's cooling demand, and domestic hot water is prepared during the cooling process. When the heat pump unit does not have a cooling demand, and the hot water temperature and the hot water inlet temperature both meet the first condition, if the heat pump unit is still started, the cooling temperature may be too low and the operating cost may increase. Therefore, when the heat pump unit does not have a cooling demand, and the hot water temperature and the hot water inlet temperature both meet the first condition, the heat pump unit can remain silent and not respond until the heat pump unit has a cooling demand, at which point the heat pump unit can start running in the cooling plus domestic hot water mode.

[0061] In some embodiments of the present application, the heat pump unit can determine whether the heat pump unit has a cooling demand based on the following method: obtain the cooling target temperature, the air-conditioning side water outlet temperature and the start-up temperature difference of the heat pump unit; if it is determined that the air-conditioning side water outlet temperature is greater than or equal to the sum of the cooling target temperature and the start-up temperature difference within a preset time, it is determined that the heat pump unit has a cooling demand; if it is determined that the air-conditioning side water outlet temperature is less than the sum of the cooling target temperature and the start-up temperature difference within the preset time, it is determined that the heat pump unit does not have a cooling demand.

[0062] In some embodiments, as shown in FIG1 , the heat pump unit can detect the outlet water temperature on the air conditioner side via a fifth temperature sensor. The preset duration and cooling target temperature can be customized, and the startup temperature difference can be determined based on the temperature difference between the indoor and outdoor ambient temperatures at startup, the operating efficiency of the heat pump unit, the equipment capacity, and other factors.

[0063] In some embodiments, when the outlet water temperature on the air conditioner side is greater than or equal to the sum of the cooling target temperature and the startup temperature difference within a preset time period, it indicates that the cooling function provided by the current heat pump unit cannot meet the user's cooling demand, and the heat pump unit needs to be activated to meet the user's cooling demand, that is, the heat pump unit has a cooling demand at this time. When the outlet water temperature on the air conditioner side is less than the sum of the cooling target temperature and the startup temperature difference within a preset time period, it indicates that the cooling function provided by the current heat pump unit can meet the user's cooling demand, and there is no need to activate the heat pump for cooling, that is, the heat pump unit has no cooling demand at this time.

[0064] S13: Calculating a target output frequency in a target operation mode based on a pre-stored capacity calculation mapping table, and controlling the compressor to operate according to the target output frequency.

[0065] In some embodiments, when the target operating mode is cooling mode or cooling plus hot water mode, the pre-stored capacity calculation mapping table includes preset multiple sets of temperature difference ranges, multiple sets of temperature difference change rate ranges, and correspondences between temperature difference ranges, temperature difference change rate ranges, and frequency adjustment parameters. When operating in cooling mode or cooling plus hot water mode, the heat pump unit undergoes a periodic cycle, such as a refrigeration cycle, and thus the output frequency of the compressor in the heat pump unit also undergoes periodic changes. The temperature difference can be determined based on the air conditioning side outlet water temperature and the cooling target temperature of the heat pump unit during an operating cycle. The temperature difference change rate is used to characterize the change in temperature difference between adjacent operating cycles. For example, the change in temperature difference in the current operating cycle relative to the temperature difference in the previous operating cycle can be determined by calculating the difference between the temperature difference in the previous operating cycle and the temperature difference in the current operating cycle.

[0066] In some embodiments, the target output frequency refers to the output frequency of the compressor in the current operation cycle.

[0067] In some embodiments, after determining the target output frequency of the compressor in the current operation cycle, the heat pump unit can control the compressor to operate in a target operation mode according to the target output frequency.

[0068] In some embodiments, the heat pump unit can pre-establish a correspondence between the target operating mode and the capacity calculation mapping table. After determining the target operating mode of the heat pump unit according to the first demand judgment strategy, the heat pump unit can determine the capacity calculation mapping table corresponding to the target operating mode based on the correspondence between the target operating mode and the capacity calculation mapping table. The target output frequency for the target operating mode can then be calculated based on the corresponding capacity calculation mapping table, and the compressor can be controlled to operate at the target output frequency. This embodiment of the present application primarily describes how to determine the target output frequency of the compressor in the current operating cycle when in cooling mode or cooling plus domestic hot water mode.

[0069] In some embodiments of the present application, the target output frequency in the target operating mode is calculated based on a pre-stored capacity calculation mapping table, including: obtaining the air-conditioning side water outlet temperature and the cooling target temperature of the heat pump unit in the current operating cycle; determining the target temperature difference based on the air-conditioning side water outlet temperature and the cooling target temperature; determining the target temperature difference change rate based on the target temperature difference and the historical temperature difference, where the historical temperature difference is the temperature difference of the previous operating cycle of the current operating cycle; matching the target frequency adjustment parameter from the capacity calculation mapping table based on the target temperature difference and the target temperature difference change rate; and calculating the target output frequency of the current operating cycle based on the target frequency adjustment parameter and the historical output frequency of the previous operating cycle.

[0070] In some embodiments, when the target operating mode is a cooling mode or a cooling plus domestic hot water mode, the pre-stored capacity calculation mapping table includes a preset plurality of sets of temperature difference ranges, a plurality of sets of temperature difference change rate ranges, and the correspondence between the temperature difference ranges, the temperature difference change rate ranges, and the frequency adjustment parameters. The target temperature difference represents the cooling temperature difference of the current operating cycle. The target temperature difference change rate table shows the change in the temperature difference of the current operating cycle relative to the temperature difference of the previous operating cycle of the current operating cycle. The target output frequency of the compressor refers to the output frequency of the compressor in the current operating cycle. Among them, the operating cycle can be customized, for example, it can be set to 30 seconds. The plurality of sets of temperature difference ranges, the plurality of sets of temperature difference change rate ranges, and the corresponding frequency adjustment parameters in the pre-stored capacity calculation mapping table can be customized.

[0071] In some embodiments, when the target operating mode is determined to be cooling mode or cooling plus domestic hot water mode, the heat pump unit can determine the target output frequency of the compressor in the heat pump unit in the current operating cycle according to the formula u(k)=u(k-1)+△u(k). In the formula, u(k) represents the target output frequency of the compressor; u(k-1) represents the historical output frequency of the compressor in the previous operating cycle of the current operating cycle; △u(k) represents the target frequency adjustment parameter. In other words, the heat pump unit can determine the target output frequency of the current operating cycle based on the historical output frequency of the previous operating cycle and the target frequency adjustment parameter. Among them, the target frequency adjustment parameter △u(k) can be determined based on the target temperature difference, the target temperature difference change rate and the pre-stored capacity calculation mapping relationship table.

[0072] In some embodiments, in the process of determining the target rate adjustment parameters based on the target temperature difference, the target temperature difference change rate and the pre-stored capacity calculation mapping table, the heat pump unit can obtain the air conditioning side outlet water temperature and the cooling target temperature of the heat pump unit in the current operating cycle. As shown in Figure 1, the air conditioning side outlet water temperature can be detected by a fourth temperature sensor. The cooling target temperature can be a pre-set cooling demand temperature and can be customized. The heat pump unit can then determine the target temperature difference of the current operating cycle based on the air conditioning side outlet water temperature and the cooling target temperature, and obtain the historical temperature difference of the heat pump unit in the previous operating cycle of the current operating cycle. Based on the target temperature difference and the historical temperature difference, the target temperature difference change rate is determined. Since the pre-stored capacity calculation mapping table includes a preset plurality of temperature difference ranges, a plurality of temperature difference change rate ranges and a correspondence between the temperature difference range, the temperature difference change rate range and the frequency adjustment parameter, the heat pump unit can match the target frequency adjustment parameter from the capacity calculation mapping table based on the target temperature difference and the target temperature difference change rate.

[0073] In some embodiments, the heat pump unit can substitute the air conditioning side outlet water temperature and the cooling target temperature during the current operating cycle into the following formula: Temperature Difference = (Cooling Target Temperature - Preset Parameter) - Air Conditioning Side Outlet Water Temperature to determine the target temperature difference for the current operating cycle. The preset parameter can be customized, for example, 1°C.

[0074] In some embodiments, the heat pump unit may use the difference between the historical temperature difference and the target temperature difference as the target temperature difference change rate.

[0075] In some embodiments, the heat pump unit matches the target frequency adjustment parameters from the capacity calculation mapping table based on the target temperature difference and the target temperature difference change rate, including: determining the target temperature difference range corresponding to the target temperature difference, and determining the target change rate range corresponding to the target temperature difference change rate; matching the target frequency adjustment parameters corresponding to the target temperature difference range and the target change rate range from the capacity calculation mapping table.

[0076] In some embodiments, when matching a target frequency adjustment parameter from a capacity calculation mapping table based on a target temperature difference and a target temperature difference change rate, the heat pump unit may match a target temperature difference range corresponding to the target temperature difference from multiple sets of temperature difference ranges in the capacity calculation mapping table, and match a target temperature difference change rate range corresponding to the target temperature difference change rate from multiple sets of temperature difference change rate ranges. The heat pump unit may then determine the target frequency adjustment parameter corresponding to the target temperature difference and the target temperature difference change rate based on the corresponding relationship between the temperature difference ranges, the temperature difference change rate ranges, and the frequency adjustment parameter in the capacity calculation mapping table.

[0077] As an example, please refer to Table 1 below, which shows a capacity calculation mapping table provided in an embodiment of the present application when the target operating mode is a cooling mode or a cooling plus domestic hot water mode. As shown in Table 1 below, the capacity calculation mapping table includes preset multiple groups of temperature difference ranges, multiple groups of temperature difference change rate ranges, and the correspondence between the temperature difference ranges, the temperature difference change rate ranges, and the frequency adjustment parameters. Among them, the multiple groups of temperature difference ranges, the multiple groups of temperature difference change rate ranges, and the corresponding frequency adjustment parameters in the pre-stored capacity calculation mapping table can be customized. The settings in Table 1 are for example explanation. This application does not limit the specific values ​​of the multiple groups of temperature difference ranges, the multiple groups of temperature difference change rate ranges, and the corresponding frequency adjustment parameters.

[0078] As an example, if the target temperature difference is determined to be 1 and the target temperature difference change rate is 0.3, according to Table 1, the target temperature difference range corresponding to the target temperature difference is (0.3, 1.5], and the target change rate range corresponding to the target temperature difference change rate is (0.2, 0.4]). According to the correspondence between the temperature difference range, the temperature difference change rate range, and the frequency adjustment parameter in Table 1, the target frequency adjustment parameter can be determined to be a34. Therefore, it can be seen that the target output frequency of the compressor in the current operating cycle is equal to the output frequency of the compressor in the previous operating cycle.

[0079] Table 1

[0080] In some embodiments, the output frequency of the compressor in a heat pump unit affects the cooling or domestic hot water production efficiency of the heat pump unit. By adjusting the output frequency of the compressor, the heat pump unit can operate more efficiently under different conditions and effectively maintain a stable temperature (e.g., the cooling temperature).

[0081] In some embodiments of the present application, the heat pump unit can switch the target operating mode according to the second demand judgment strategy, and the target operating mode includes any one of cooling mode, cooling plus domestic hot water mode, standby mode, alarm shutdown mode and electric heating mode.

[0082] In some embodiments, after the heat pump unit controls the compressor to operate in the target operating mode according to the target output frequency, the heat pump unit can monitor parameters such as hot water temperature, hot water outlet temperature, hot water inlet temperature, and exhaust temperature in real time. When parameters such as hot water temperature, hot water outlet temperature, hot water inlet temperature, and exhaust temperature meet certain conditions, the heat pump unit can control the switching of the target operating mode to ensure efficient operation of the heat pump unit and avoid unnecessary energy waste.

[0083] In some embodiments, the target operating mode includes but is not limited to any one of a cooling mode, a cooling and domestic hot water mode, a standby mode, an alarm shutdown mode, and an electric heating mode.

[0084] In some embodiments of the present application, the target operating mode is switched according to the second demand judgment strategy, including: switching the target operating mode if any of the following conditions is met: within a first time period, the hot water outlet temperature of the heat pump unit is greater than a first temperature threshold; within a second time period, the difference between the exhaust temperature and the hot water inlet temperature of the heat pump unit is less than a second temperature threshold; within a third time period, the hot water inlet temperature of the heat pump unit is greater than a third temperature threshold; the air-conditioning side outlet water temperature of the heat pump is less than the sum of the cooling target temperature of the heat pump and the shutdown temperature difference.

[0085] In some embodiments, the first temperature threshold, the second temperature threshold, the third temperature threshold, the first time duration, the second time duration, and the third time duration can all be customized. For example, the first temperature threshold can be set to 63°C, the second temperature threshold can be set to 8°C, the third temperature threshold can be set to 60°C, the first time duration can be set to 5 seconds, the second time duration can be set to 10 minutes, and the third time duration can be set to 5 seconds. As shown in Figure 1, the heat pump unit can detect the hot water outlet temperature through the second temperature sensor.

[0086] In some embodiments, when the outlet water temperature on the air conditioning side of the heat pump is less than the sum of the heat pump's cooling target temperature and the shutdown temperature difference, the heat pump unit's cooling function can meet the user's cooling needs. If (for a preset duration) the outlet water temperature on the air conditioning side of the heat pump is less than the sum of the heat pump's cooling target temperature and the shutdown temperature difference, the heat pump unit may switch the control target operating mode to standby mode. The preset duration can be customized.

[0087] In some embodiments, the conditions for triggering the heat pump unit to switch to the target operating mode include but are not limited to the hot water outlet temperature of the heat pump unit being greater than the first temperature threshold within the first time period; or the difference between the exhaust temperature and the hot water inlet temperature of the heat pump unit being less than the second temperature threshold within the second time period; or the hot water inlet temperature of the heat pump unit being greater than the third temperature threshold within the third time period; the outlet water temperature on the air-conditioning side of the heat pump being less than the sum of the cooling target temperature of the heat pump and the shutdown temperature difference.

[0088] In some embodiments of the present application, switching the target operating mode according to the second demand judgment strategy includes: if it is determined that the hot water temperature of the heat pump unit is less than a fourth temperature threshold, switching the target operating mode to an electric heating mode.

[0089] It should be noted that the electric heating mode mainly refers to the electric auxiliary heater installed in the domestic hot water tank 10 to help speed up the production of domestic hot water. The electric auxiliary heater can be a PTC electric heating rod or a nanotube heating rod. The domestic hot water heat exchanger plus the electric auxiliary heater can quickly replenish the thermal energy in the domestic hot water tank 10 to achieve a continuous supply of hot water.

[0090] In some embodiments, if the hot water temperature of the heat pump unit is detected to be less than a fourth temperature threshold, indicating that the hot water temperature in the domestic hot water tank is too low, the heat pump unit may switch its target operating mode to electric heating mode to assist in heating the water in the domestic hot water tank in order to meet the user's domestic hot water demand as quickly as possible. The fourth temperature threshold can be customized, for example, the fourth temperature threshold can be set to 45°C.

[0091] As an example, please refer to Figure 4, which is an example diagram of the control principle of the control method of the heat pump unit provided in the embodiment of the present application. As shown in Figure 4, taking air conditioning as an example, in summer, the heat pump unit in the air conditioning can prepare domestic hot water during the refrigeration process. At this time, the heat pump unit is mainly to meet the user's demand for refrigeration (that is, it is understood as refrigeration priority). The heat pump unit can be controlled to run the refrigeration plus domestic hot water mode until the hot water temperature rises to 60°C. The domestic hot water prepared by the heat pump unit can meet the user's demand for domestic hot water. At this time, if the heat pump unit still has a refrigeration demand, the heat pump unit can be controlled to switch to the refrigeration mode; if the heat pump unit does not have a refrigeration demand, the heat pump unit can be controlled to switch to the standby mode to save energy. When the hot water temperature is lower than 45°C, the heat pump unit can start electric heating to increase the hot water temperature. When the hot water temperature rises to 55°C, the heat pump unit can turn off the electric heating.

[0092] In some embodiments of the present application, the heat pump unit includes a first valve and a second valve. If the target operating mode is cooling mode, the first valve is controlled to close and the second valve is controlled to open; if the target operating mode is cooling plus domestic water mode, the first valve is controlled to open and the second valve is controlled to close.

[0093] In some embodiments, the first valve may be the first three-way valve as shown in FIG1 , and the second valve may be the second three-way valve as shown in FIG1 . Opening the first valve may mean that the second and third interfaces of the first three-way valve are open, while the first interface is closed; closing the first valve may mean that the first and third interfaces of the first three-way valve are open, while the second interface is closed. Opening the second valve may mean that the second and third interfaces of the second three-way valve are open, while the first interface is closed; closing the second valve may mean that the first and third interfaces of the second three-way valve are open, while the second interface is closed.

[0094] In some embodiments, when the target operating mode is cooling mode, the heat pump unit can control the first valve to close and the second valve to open. A specific refrigerant operation diagram can be found in Figure 2. When the target operating mode is cooling plus domestic water mode, the heat pump unit can control the first valve to open and the second valve to close. A specific refrigerant operation diagram can be found in Figure 1.

[0095] In a control method for a heat pump unit provided in an embodiment of the present application, when the heat pump unit determines that the standby operating mode of the heat pump unit is the cooling plus domestic hot water mode, the target operating mode of the heat pump unit is determined according to the first demand judgment strategy, and the heat pump unit is controlled to operate according to the target operating mode. The target operating mode includes any one of the cooling mode and the cooling plus domestic hot water mode. In order to ensure the stable operation of the heat pump unit and improve the operating efficiency of the heat pump unit, after the heat pump unit determines the target operating mode, it calculates the target output frequency under the target operating mode based on a pre-stored capacity calculation mapping table. Then, the heat pump unit controls the compressor to operate according to the target output frequency to avoid damage to the heat pump unit due to overload, etc., which affects the working efficiency of the heat pump unit.

[0096] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0097] In one embodiment of the present application, a control device 500 for a heat pump unit is provided. The heat pump unit includes a compressor. The functions implemented by the control device 500 correspond one-to-one to the control method for the heat pump unit in the above-described embodiment. As shown in FIG5 , the control device 500 for the heat pump unit includes a setting module 501 for setting the standby operating mode of the heat pump unit to a cooling plus domestic hot water mode; a determination module 502 for determining a target operating mode of the heat pump unit according to a first demand determination strategy, the target operating mode including either a cooling mode or a cooling plus domestic hot water mode; and a control module 503 for calculating a target output frequency in the target operating mode based on a pre-stored capacity calculation mapping table, and controlling the compressor to operate according to the target output frequency.

[0098] The specific definitions of the heat pump unit control device 500 can be found in the definitions of the heat pump unit control method described above and will not be repeated here. Each module in the heat pump unit control device 500 can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the modules can be embedded in or independent of a processor in the heat pump unit in hardware form, or stored in a memory in the heat pump unit in software form, so that the processor can call and execute the corresponding operations of each module.

[0099] FIG6 is a schematic diagram of the structure of a heat pump unit according to an embodiment of the present application. The heat pump unit 100 can be used in applications such as air conditioning. The network in which the heat pump unit 100 resides includes, but is not limited to, the Internet, a wide area network (WAN), a metropolitan area network (MAN), a local area network (LAN), a virtual private network (VPN), and the like.

[0100] As shown in Figure 6, the heat pump unit 100 includes a communication module 101, a memory 102, a processor 103, an input / output (I / O) interface 104, and a bus 105. The processor 103 is coupled to the communication module 101, the memory 102, and the I / O interface 104 via the bus 105.

[0101] The communication module 101 can be a wireless communication module or a mobile communication module. The wireless communication module can provide wireless communication solutions for the heat pump unit 100, including wireless local area networks (WLAN) (e.g., wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR), etc. The mobile communication module can provide wireless communication solutions for the heat pump unit 100, including 2G / 3G / 4G / 5G.

[0102] The memory 102 may include one or more random access memories (RAMs) and one or more non-volatile memories (NVMs). The RAM can be directly read and written by the processor 103 and can be used to store executable programs (such as machine instructions) of the operating system or other running programs, as well as user and application data. The RAM may include static random-access memory (SRAM), dynamic random-access memory (DRAM), synchronous dynamic random-access memory (SDRAM), double data rate synchronous dynamic random-access memory (DDR SDRAM, such as the fifth generation DDR SDRAM generally referred to as DDR5 SDRAM), etc.

[0103] The non-volatile memory can also store executable programs and user and application data, etc., which can be pre-loaded into the random access memory for direct reading and writing by the processor 103. The non-volatile memory can include disk storage devices and flash memory.

[0104] The memory 102 is used to store one or more computer programs. The one or more computer programs are configured to be executed by the processor 103. The one or more computer programs include multiple instructions. When the multiple instructions are executed by the processor 103, the heat pump unit control method executed on the heat pump unit 100 can be implemented.

[0105] In other embodiments, the heat pump unit 100 further includes an external memory interface for connecting to an external memory to expand the storage capacity of the heat pump unit 100 .

[0106] The processor 103 may include one or more processing units. For example, the processor 103 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU). The different processing units may be independent devices or integrated into one or more processors.

[0107] The processor 103 provides computing and control capabilities. For example, the processor 103 is used to execute a computer program stored in the memory 102 to implement the above-mentioned control method of the heat pump unit.

[0108] The I / O interface 104 is used to provide a channel for user input or output. For example, the I / O interface 104 can be used to connect various input and output devices, such as a mouse, keyboard, touch device, display screen, etc., so that the user can enter information or visualize information.

[0109] The bus 105 is at least used to provide a channel for mutual communication among the communication module 101 , the memory 102 , the processor 103 , and the I / O interface 104 in the heat pump unit 100 .

[0110] It should be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the heat pump unit 100. In other embodiments of the present application, the heat pump unit 100 may include more or fewer components than illustrated, or may combine or separate certain components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0111] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. The computer program includes program instructions. The method implemented when the program instructions are executed can refer to the control method of the heat pump unit in the above-mentioned embodiments of the present application.

[0112] The computer-readable storage medium may be the internal memory of the heat pump unit described in the above embodiment, such as the hard disk or memory of the heat pump unit. The computer-readable storage medium may also be an external storage device of the heat pump unit, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the heat pump unit.

[0113] Furthermore, the computer-readable storage medium may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function, etc.; the data storage area may store data created according to the use of the heat pump unit, etc.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A control method for a heat pump unit, the heat pump unit comprising a compressor, characterized in that: The control method comprises: Setting the standby operation mode of the heat pump unit to a refrigeration plus domestic hot water mode; Determining a target operation mode of the heat pump unit according to a first demand judgment strategy, wherein the target operation mode includes any one of a cooling mode and a cooling plus domestic hot water mode; The target output frequency in the target operation mode is calculated based on a pre-stored capacity calculation mapping table, and the compressor is controlled to operate according to the target output frequency.

2. The control method according to claim 1, characterized in that: Determining the target operation mode of the heat pump unit according to the first demand judgment strategy includes: If the heat pump unit has a cooling demand, and the hot water temperature, hot water inlet temperature and exhaust temperature of the heat pump unit all meet the first condition, the target operation mode is determined to be a cooling plus domestic hot water mode.

3. The control method of the heat pump unit according to claim 2, characterized in that: Determining the target operation mode of the heat pump unit according to the first demand judgment strategy includes: If the heat pump unit does not have the cooling demand, and the hot water temperature and the hot water inlet temperature both meet the first condition, the heat pump unit is controlled not to start.

4. The control method according to claim 3, characterized in that: The control method further comprises: Obtaining the cooling target temperature, air conditioning side water outlet temperature and startup temperature difference of the heat pump unit; If it is determined that the outlet water temperature of the air conditioner side is greater than or equal to the sum of the cooling target temperature and the startup temperature difference within the preset time, it is determined that the heat pump unit has the cooling demand; If it is determined that the water outlet temperature on the air-conditioning side is less than the sum of the cooling target temperature and the startup temperature difference within the preset time period, it is determined that the heat pump unit does not have the cooling demand.

5. The control method according to claim 1, characterized in that: The calculating the target output frequency in the target operating mode based on a pre-stored capacity calculation mapping table includes: Obtaining the air conditioning side water outlet temperature and the cooling target temperature of the heat pump unit in the current operation cycle; Determining a target temperature difference based on the air conditioning side water outlet temperature and the cooling target temperature; Determine a target temperature difference change rate based on the target temperature difference and the historical temperature difference, wherein the historical temperature difference is the temperature difference of the previous operation cycle of the current operation cycle; matching a target frequency adjustment parameter from the capability calculation mapping table based on the target temperature difference and the target temperature difference change rate; The target output frequency of the current operation cycle is calculated based on the target frequency adjustment parameter and the historical output frequency of the previous operation cycle.

6. The control method according to claim 1, characterized in that: The control method further comprises: The target operation mode is switched according to the second demand judgment strategy, and the target operation mode includes any one of a cooling mode, a cooling plus domestic hot water mode, a standby mode, an alarm shutdown mode and an electric heating mode.

7. The control method according to claim 6, characterized in that: The switching of the target operation mode according to the second demand determination strategy includes: If any of the following conditions is met, the target operation mode is switched: During a first time period, the hot water outlet temperature of the heat pump unit is greater than a first temperature threshold; During the second time period, the difference between the exhaust temperature of the heat pump unit and the hot water inlet temperature is less than a second temperature threshold; During a third time period, the hot water inlet temperature of the heat pump unit is greater than a third temperature threshold; The air-conditioning-side outlet water temperature of the heat pump is less than the sum of the cooling target temperature of the heat pump and the shutdown temperature difference.

8. The control method according to claim 6, characterized in that: The switching of the target operation mode according to the second demand determination strategy includes: If it is determined that the hot water temperature of the heat pump unit is less than a fourth temperature threshold, the target operation mode is switched to an electric heating mode.

9. A heat pump unit, characterized in that: The heat pump unit includes a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor. When the processor executes the computer-readable instructions, the control method for the heat pump unit according to any one of claims 1 to 8 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by a processor, the control method of the heat pump unit according to any one of claims 1 to 8 is implemented.

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