Control method and device of heat pump unit, heat pump unit and storage medium

Abstract

The invention provides a control method and device of a heat pump unit, the heat pump unit and a storage medium, the method is applied to the heat pump unit, the heat pump unit comprises a compressor and a water side heat exchanger, and the method comprises the steps that the target temperature difference value of the water side heat exchanger and the environment temperature of the environment space where the heat pump unit is located are obtained; the target temperature difference value is the temperature difference needed by the water inlet temperature and the water outlet temperature of the water side heat exchanger, the maximum operation frequency of the compressor is determined based on the target temperature difference value, the environment temperature and the water inlet temperature, the compressor is controlled to operate at the target operation frequency, and the target operation frequency is smaller than or equal to the maximum operation frequency. According to the method, the operation frequency of the compressor can be adjusted to be matched with the opening of the electronic expansion valve, and frequent starting and stopping of the heat pump unit are avoided.

Description

Technical Field

[0001] The present application relates to the field of heat pumps, and more specifically, to a control method, device, heat pump unit, and storage medium for a heat pump unit. Background Art

[0002] The heat pump unit has the advantages of high safety, energy saving, intelligent control, etc., and can be used for heat exchange. In related technologies, the operation frequency of the compressor of the heat pump unit is usually controlled by the proportional-integral control (PI control) method. In the case where the temperature difference of the water-side heat exchanger of the heat pump unit changes greatly, the PI control method cannot respond to the temperature difference change in time, and adjust the operation frequency of the compressor to match the opening degree of the electronic expansion valve, resulting in frequent start and stop of the heat pump unit. Summary of the Invention

[0003] The present application provides a control method, device, heat pump unit, and storage medium for a heat pump unit. This method can adjust the operation frequency of the compressor to match the opening degree of the electronic expansion valve, and avoid frequent start and stop of the heat pump unit.

[0004] In a first aspect, a control method for a heat pump unit is provided, which is applied to a heat pump unit. The heat pump unit includes a compressor and a water-side heat exchanger. The method includes: obtaining a target temperature difference of the water-side heat exchanger and the ambient temperature of the environment space where the heat pump unit is located, where the target temperature difference is the temperature difference that the inlet water temperature and the outlet water temperature of the water-side heat exchanger need to reach; determining the maximum operation frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature; controlling the compressor to operate at a target operation frequency, where the target operation frequency is less than or equal to the maximum operation frequency.

[0005] In a second aspect, a control device for a heat pump unit is provided, which is applied to a heat pump unit. The heat pump unit includes a compressor and a water-side heat exchanger. The device includes: an obtaining unit, configured to obtain a target temperature difference of the water-side heat exchanger and the ambient temperature of the environment space where the heat pump unit is located, where the target temperature difference is the temperature difference that the inlet water temperature and the outlet water temperature of the water-side heat exchanger need to reach; a determining unit, configured to determine the maximum operation frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature; a control unit, configured to control the compressor to operate at a target operation frequency, where the target operation frequency is less than or equal to the maximum operation frequency.

[0006] In a third aspect, a heat pump unit is provided, including: a memory, configured to store executable program code; a processor, configured to call and run the executable program code from the memory, so that the heat pump unit executes the method in the first aspect or any possible implementation manner of the first aspect.

[0007] Fourthly, a computer program product is provided, which includes computer program code that, when running on a computer, causes the computer to execute the method in the first aspect or any possible implementation manner of the first aspect as described above.

[0008] Fifthly, a computer-readable storage medium is provided, which stores computer program code that, when running on a computer, causes the computer to execute the method in the first aspect or any possible implementation manner of the first aspect as described above.

[0009] In the embodiments of the present application, by obtaining the target temperature difference of the water-side heat exchanger and the ambient temperature of the environment where the heat pump unit is located, determining the maximum operating frequency of the compressor based on the target temperature difference, ambient temperature, and inlet water temperature, and controlling the compressor to operate at the target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency. By determining the maximum operating frequency of the compressor through the temperature difference (i.e., the target temperature difference) required between the inlet water temperature and the outlet water temperature of the water-side heat exchanger, the ambient temperature, and the inlet water temperature, the rapid increase in the operating frequency of the compressor is avoided, the operating frequency of the compressor is controlled to match the overall heat exchange capacity of the heat pump unit, the frequent start and stop of the heat pump unit are avoided, and the overall heat exchange efficiency of the heat pump unit is improved. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of a heat pump unit provided by an embodiment of the present application;

[0011] Figure 2 is a schematic flowchart of a control method for a heat pump unit provided by an embodiment of the present application;

[0012] Figure 3 is a schematic flowchart of a control method for a heat pump unit provided by an embodiment of the present application;

[0013] Figure 4 is an example schematic diagram of a temperature difference change range;

[0014] Figure 5 is an example schematic diagram of an ambient temperature change range;

[0015] Figure 6 is an example schematic diagram of a maximum operating frequency;

[0016] Figure 7 is a schematic flowchart of a control method for a heat pump unit provided by an embodiment of the present application;

[0017] Figure 8It is an example schematic diagram of a target temperature difference provided by an embodiment of the present application;

[0018] Figure 9 It is a schematic structural diagram of a control device of a heat pump unit provided by an embodiment of the present application;

[0019] Figure 10 It is a schematic structural diagram of a heat pump unit provided by an embodiment of the present application. Detailed implementation manners

[0020] Next, the technical solutions in the present application will be clearly and elaborately described in conjunction with the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B. The "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

[0021] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0022] Please refer to Figure 1 , Figure 1 It is a schematic structural diagram of a heat pump unit 1 provided by an embodiment of the present application. As Figure 1 shown, the heat pump unit 1 includes a compressor 10, a water-side heat exchanger 20, a throttling element 30, and a fin heat exchanger 40. Among them, the second port of the compressor 10 is connected to the first port of the water-side heat exchanger 20, the second port of the water-side heat exchanger 20 is connected to the first port of the throttling element 30, the second port of the throttling element 30 is connected to the first port of the fin heat exchanger 40, and the second port of the fin heat exchanger 40 is connected to the first port of the compressor 10. In the heating mode, the refrigerant in the heat pump unit 1 flows through the compressor 10, the water-side heat exchanger 20, the throttling element 30, and the fin heat exchanger 40 in sequence.

[0023] The liquid medium that exchanges heat with the heat pump unit 1 flows through the corresponding pipelines in the heat pump unit 1, enabling the liquid medium to exchange heat with the water-side heat exchanger 20. It can be understood that in the heating mode, the liquid medium absorbs heat from the water-side heat exchanger 20 and is thus heated. This heating process utilizes the working principle of the heat pump unit 1, that is, through the compression action of the compressor 10, the heat released by the refrigerant in the water-side heat exchanger 20 is transferred to the liquid medium. In some cases, this liquid medium can be used by the water system 50. In some cases, both the heat pump unit 1 and the water system 50 are components of a certain device. For example, both the heat pump unit 1 and the water system 50 are heaters (such as floor heating, radiators, etc.).

[0024] Based on Figure 1 Regarding the structure of the heat pump unit shown, during the operation of the compressor, especially in the large temperature difference mode, in order to provide sufficient heat, it is required that the heat pump unit outputs a relatively high exhaust temperature, and the compressor 10 is controlled to operate at a relatively high frequency. When the exhaust temperature is relatively high, the throttling element 30 usually opens relatively wide so that more liquid medium enters the fin heat exchanger 40. If the frequency of the compressor 10 decreases at this time and the opening degree of the throttling element 30 is not adjusted in time, it will cause an excessive amount of refrigerant to enter the fin heat exchanger 40, reducing the heat exchange efficiency of the fin heat exchanger 40 and resulting in a reduction in the overall heat exchange efficiency of the heat pump unit. The large temperature difference mode refers to a relatively large difference between the inlet temperature and the outlet temperature of the water-side heat exchanger 20.

[0025] Based on this, the present application proposes a control method for a heat pump unit, which obtains the target temperature difference of the water-side heat exchanger and the ambient temperature of the environment where the heat pump unit is located, determines the maximum operating frequency of the compressor based on the target temperature difference, ambient temperature, and inlet temperature, and finally controls the compressor to operate at the target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency. By determining the maximum operating frequency of the compressor based on the temperature difference (i.e., the target temperature difference) required between the inlet temperature and the outlet temperature of the water-side heat exchanger, the ambient temperature, and the inlet temperature, it is possible to avoid a rapid increase in the operating frequency of the compressor, ensure that the operating frequency of the compressor matches the overall heat exchange capacity of the heat pump unit, avoid frequent start-stop of the heat pump unit, and improve the overall heat exchange efficiency of the heat pump unit.

[0026] Based on Figure 1 the structural schematic diagram shown below, the control method for the heat pump unit provided by the embodiments of the present application will be introduced in detail in combination with Figures 2 - 8 .

[0027] Please refer to Figure 2 , which is a schematic flowchart of a control method for a heat pump unit provided by an embodiment of the present application. As Figure 2 shown, the method of the embodiment of the present application may include the following steps S101 - step S103.

[0028] S101. Obtain the target temperature difference of the water-side heat exchanger and the ambient temperature of the environment where the heat pump unit is located. The target temperature difference is the temperature difference that the inlet water temperature and the outlet water temperature of the water-side heat exchanger need to reach.

[0029] In one embodiment, after the heat pump unit starts to operate, obtain the target temperature difference of the water-side heat exchanger and the ambient temperature of the environment where the heat pump unit is located. The target temperature difference refers to the temperature difference that the inlet water temperature and the outlet water temperature of the water-side heat exchanger need to reach, which can be obtained by acquiring the operating condition parameters (including the inlet water temperature, the target shutdown temperature of the heat pump unit, etc.) collected during the operation of the heat pump unit. The inlet water temperature of the liquid medium that is transported from the water-using system 50 to the water-side heat exchanger for heat exchange can be obtained by installing a temperature detection component at the inlet of the water-side heat exchanger, where the liquid medium can be water. In the embodiment of the present application, by directly obtaining the inlet water temperature of the water-side heat exchanger through the temperature detection component, the inlet water temperature of the water-side heat exchanger can be obtained quickly and accurately.

[0030] It can be understood that the heating efficiency of the heat pump unit is affected by the ambient temperature of the environment where it is located. When the ambient temperature of the environment where it is located is relatively low, the difficulty of the fin heat exchanger absorbing heat from the air increases; when the ambient temperature of the environment where it is located is relatively high, the fin heat exchanger is relatively easy to absorb heat from the air, and the heat exchange efficiency of the heat pump system is relatively high. Therefore, it is necessary to obtain the ambient temperature of the environment where the heat pump unit is located, determine the heat exchange efficiency of the heat pump unit, and then determine the operating frequency of the compressor. The control of the compressor of the heat pump unit is matched with the overall heat exchange efficiency of the heat pump unit, improving the reliability of determining the operating frequency of the compressor. Optionally, in the embodiment of the present application, the ambient temperature of the environment where the heat pump unit is located can be obtained through the temperature detection component installed on the fin heat exchanger. By obtaining the ambient temperature of the environment where the heat pump unit is located through the temperature detection component, the ambient temperature can be obtained quickly and accurately.

[0031] S102. Determine the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature.

[0032] In one embodiment, after obtaining the target temperature difference, the ambient temperature, and the inlet water temperature, in the step of determining the maximum operating frequency of the compressor, in some possible implementation manners, the mapping relationship between the target temperature difference, the ambient temperature, and the inlet water temperature and the maximum operating frequency of the compressor can be recorded through a data table, a database, or other files for recording data. For any target temperature difference, ambient temperature, and inlet water temperature, based on the mapping relationship between the target temperature difference, the ambient temperature, and the inlet water temperature and the maximum operating frequency, the maximum operating frequency of the compressor corresponding to the heat pump unit at the target temperature difference, the ambient temperature, and the inlet water temperature can be determined. It can be understood that in the mapping relationship, the target temperature difference, the ambient temperature, and the inlet water temperature correspond to the maximum operating frequency of the compressor. If any one of the target temperature difference, the ambient temperature, and the inlet water temperature changes, the corresponding maximum operating frequency of the compressor may also change, and the specific situation is determined according to the mapping relationship.

[0033] In some possible implementation manners, the mapping relationship between the target temperature difference, the ambient temperature, and the inlet water temperature and the maximum operating frequency of the compressor can be represented as a corresponding mathematical function. Based on the heat pump unit at the target temperature difference, the ambient temperature, the inlet water temperature, and the above mathematical function, the corresponding maximum operating frequency of the compressor can be calculated.

[0034] S103, control the compressor to operate at a target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency.

[0035] In one embodiment, the target operating frequency is the frequency required for controlling the compressor to operate. After determining the maximum operating frequency of the compressor, control the compressor to operate at the target operating frequency based on the maximum operating frequency. Exemplarily, if the maximum operating frequency is Hz_Max, then the target operating frequency for controlling the compressor is Hz, where Hz is less than or equal to Hz_Max.

[0036] In the embodiments of the present application, by obtaining the target temperature difference of the water-side heat exchanger and the ambient temperature of the environmental space where the heat pump unit is located, determining the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature, and controlling the compressor to operate at a target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency. Determining the maximum operating frequency of the compressor through the temperature difference (i.e., the target temperature difference) required between the inlet water temperature and the outlet water temperature of the water-side heat exchanger, the ambient temperature, and the inlet water temperature can avoid the rapid increase in the operating frequency of the compressor, control the operating frequency of the compressor to match the overall heat exchange capacity of the heat pump unit, avoid frequent start and stop of the heat pump unit, and improve the overall heat exchange efficiency of the heat pump unit.

[0037] Please refer to Figure 3, which is a schematic flowchart of a control method for a heat pump unit provided by an embodiment of the present application. As Figure 3 shown, the method of the embodiment of the present application may include the following steps S201 - step S205.

[0038] S201, obtain the target temperature difference of the water - side heat exchanger and the ambient temperature of the environment where the heat pump unit is located, where the target temperature difference is the temperature difference required to be achieved between the inlet temperature and the outlet temperature of the water - side heat exchanger;

[0039] Specifically, please refer to the description of step S101 in the above - mentioned specification embodiment, which will not be elaborated here.

[0040] S202, obtain the first change trend of the target temperature difference;

[0041] In one embodiment, the first change trend refers to the change rule of two adjacent target temperature differences, which includes an upward trend and a downward trend. When the first change trend of the target temperature difference is an upward trend, it means that the temperature difference required to be achieved between the inlet temperature and the outlet temperature of the heat pump unit becomes larger, that is, the difference between the target inlet temperature and the target outlet temperature becomes larger, and the heat pump unit requires higher heat exchange capacity; when the first change trend of the target temperature difference is a downward trend, it means that the temperature difference required to be achieved between the inlet temperature and the outlet temperature of the heat pump unit becomes smaller, that is, the difference between the target inlet temperature and the target outlet temperature becomes smaller, and the heat pump unit needs to reduce the heat exchange capacity. Thus, it can be seen that the heat exchange capacity of the heat pump unit is related to the first change trend of the target temperature difference. Therefore, in the embodiment of the present application, determining the maximum operating frequency of the compressor based on the first change trend of the target temperature difference can effectively control the operation of the compressor.

[0042] Furthermore, obtaining the first change trend of the target temperature difference can specifically be:

[0043] Obtain the previous target temperature difference adjacent to the target temperature difference;

[0044] If the target temperature difference is greater than the previous target temperature difference, then determine that the first change trend is an upward trend;

[0045] If the target temperature difference is less than the previous target temperature difference, then determine that the first change trend is a downward trend.

[0046] In one embodiment, the previous target temperature difference adjacent to the target temperature difference can be obtained, and then the magnitudes of the target temperature difference and the previous target temperature difference can be compared. When the target temperature difference is greater than the previous target temperature difference, it is determined that the first change trend is an upward trend; when the target temperature difference is less than the previous target temperature difference, it is determined that the first change trend is a downward trend. Exemplarily, the target temperature difference can be △tn, and the previous target temperature difference △tn-1 adjacent to the target temperature difference. If △tn>△tn-1, it is determined that the first change trend is an upward trend; if △tn<△tn-1, it is determined that the first change trend is a downward trend. It can be understood that when the target temperature difference is equal to the previous target temperature difference, it indicates that the heat load demand of the heat pump unit remains stable and the demand for heat exchange capacity has not changed. In this case, the operating state of the heat pump unit can remain relatively stable, without significantly adjusting the operating frequency of the compressor. The heat pump unit will not have problems such as high-temperature protection and reaching the set temperature and shutting down. By maintaining the current operating state and optimizing the control strategy, it can be ensured that the heat pump unit operates efficiently in a stable state.

[0047] S203. Based on the target temperature difference and the first change trend, determine the first difference change interval corresponding to the target temperature difference in the temperature difference change interval.

[0048] In one embodiment, after determining the target temperature difference and the first change trend, determine the first difference change interval corresponding to the target temperature difference in the temperature difference change interval. The temperature difference change interval refers to the range in which the target temperature difference may occur.

[0049] Please refer to Figure 4 , Figure 4 which is an example schematic diagram of the temperature difference change interval of this application. As Figure 4 shown, exemplarily, if it is determined that the target temperature difference is △tn-λ, and the previous target temperature difference adjacent to △tn-λ is △tn-θ, since △tn-λ is greater than △tn-θ, it is determined that the first change trend is an upward trend, and it is determined that the first difference change interval corresponding to the target temperature difference in the temperature difference change interval is the A2 area, please refer to the point A; if it is determined that the target temperature difference is △tn-λ, and the previous target temperature difference adjacent to △tn-λ is △tn, since △tn-λ is less than △tn, it is determined that the first change trend is a downward trend, and it is determined that the first difference change interval corresponding to the target temperature difference in the temperature difference change interval is the An area, please refer to the point B.

[0050] S204. Based on the first difference change interval and the ambient temperature, determine the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval.

[0051] In one embodiment, after determining the first difference change interval, determine the corresponding ambient temperature change interval for the first difference change interval, then obtain the second change trend of the ambient temperature, and finally determine the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval based on the second change trend and the ambient temperature, where the second difference change interval refers to the range in which the ambient temperature may occur.

[0052] Optionally, in the embodiments of the present application, obtaining the change trend of the ambient temperature may be, after obtaining the ambient temperature at the current moment, determining the previous ambient temperature adjacent to the currently obtained ambient temperature, and then determining the second change trend of the ambient temperature according to the magnitudes of the ambient temperature at the current moment and the previous ambient temperature. The specific determination process is similar to that of determining the first change trend of the target temperature difference as described above and will not be elaborated here. It can be understood that the ambient temperature change interval corresponds to the first difference change interval. If the first difference change intervals determined based on the target temperature difference are different, the corresponding temperature change intervals are also different.

[0053] Please refer to Figure 5 as shown in Figure 5 FIG. [Example diagram of the ambient temperature change interval provided by the embodiment of the present application]. Exemplarily, if it is determined that the second change trend of the ambient temperature is a decreasing trend and the ambient temperature is Tambient1 + ρ, then determine that the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval is area B2, as shown at Figure 5 point C.

[0054] S205. Determine the maximum operating frequency of the compressor based on the second difference change interval and the inlet water temperature.

[0055] In one embodiment, after determining the second difference change interval, determine the corresponding frequency change interval for the second difference change interval, then obtain the third change trend of the inlet water temperature, and determine the maximum operating frequency of the compressor in the frequency change interval based on the third change trend and the inlet water temperature, where the frequency change interval is the range in which the operating frequency of the compressor may occur.

[0056] Please refer to Figure 6 , Figure 6 FIG. [Example diagram of the maximum operating frequency provided by the embodiment of the present application]. As shown in Figure 6 FIG., if it is determined that the change trend of the inlet water temperature is a decreasing trend and the inlet water temperature is Tw_in1 + δ, then determine that the maximum operating frequency in the frequency change interval is Hz_Max3 and its minimum operating frequency is Hz_Max2, as shown at Figure 6 point D.

[0057] Further, please continue to refer to Figure 6, in the embodiment of the present application, Tw_in 1 < Tw_in1 + δ < …… < Tw_in… < Tw_in n, Hz_Max1 > Hz_Max2 > Hz_Max3. That is, in the embodiment of the present application, for a low water temperature (lower inlet water temperature), the maximum operating frequency of the compressor can be increased to ensure the heat exchange capacity of the heat pump unit and improve the comfort of users; for a high water temperature (higher inlet water temperature), the operating frequency of the compressor is restricted to ensure the reliability and stability of the operation of the heat pump unit.

[0058] In the embodiment of the present application, by comprehensively determining the maximum operating frequency of the compressor based on the target temperature difference, ambient temperature, and inlet water temperature, the maximum operating frequency of the compressor can be determined more accurately, ensuring the efficient operation of the heat pump unit under different working conditions; and based on the first difference change interval determined by the target temperature difference, the ambient temperature change interval is determined, and the second difference change interval corresponding to the ambient temperature is determined. Further, based on the second difference change interval and the inlet water temperature, the maximum operating frequency of the compressor is determined, which can accurately determine the correlation between the ambient temperature, target temperature difference, and inlet water temperature, thereby improving the accuracy of the maximum operating frequency of the compressor determined based on it.

[0059] Please refer to Figure 7 , which is a schematic flow chart of a control method for a heat pump unit provided by an embodiment of the present application. As Figure 7 shown, the method of the embodiment of the present application may include the following steps S301 - step S305.

[0060] S301, obtain the set temperature of the water - side heat exchanger and the target shutdown temperature of the heat pump unit;

[0061] In one embodiment, the set temperature is the outlet water temperature of the water - side heat exchanger set by the user; the target shutdown temperature may be the temperature for controlling the heat pump unit to automatically stop operating.

[0062] Further, the specific steps for obtaining the target shutdown temperature of the heat pump unit may be:

[0063] Determine the original shutdown temperature of the heat pump unit based on the ambient temperature;

[0064] Perform parameter correction on the original shutdown temperature to obtain the target shutdown temperature.

[0065] In one embodiment, the original shutdown temperature may be the shutdown temperature preset when the heat pump system is started. Specifically, according to the ambient temperature of the heat pump unit, the original shutdown temperature of the heat pump unit is determined, and the ambient temperature is detected in real time to perform parameter correction on the original shutdown temperature according to the ambient temperature to obtain the corresponding target shutdown temperature.

[0066] It can be understood that when the ambient temperature is low, the original shutdown temperature can be increased because the heat exchange efficiency of the heat pump unit decreases in a low-temperature environment. To ensure that the heat pump unit can continue to operate and provide sufficient heat, and prevent the heat pump unit from frequently shutting down when it cannot reach the expected indoor temperature; when the ambient temperature is high, the shutdown temperature can be decreased to prevent overheating, reduce the working burden of the heat pump unit, and also reduce the startup times of the heat pump unit, thereby saving energy and extending the service life of the heat pump unit.

[0067] S302. Determine the target temperature difference of the water-side heat exchanger based on the set temperature, the target shutdown temperature, and the inlet water temperature.

[0068] In one embodiment, after determining the set temperature, the target shutdown temperature, and the inlet water temperature, determine the target temperature difference of the water-heat exchanger based on the set temperature, the target shutdown temperature, and the inlet water temperature.

[0069] Specifically, determine the target temperature of the heat pump unit based on the set temperature and the target shutdown temperature, and then determine the target temperature difference based on the target temperature and the inlet water temperature.

[0070] As Figure 8 shown, Figure 8 is an example schematic diagram of the target temperature difference provided by this application. Tw_in is the inlet water temperature, △t is the target temperature difference, A, B, and C can represent the deadband coefficients, which are used to prevent the calculated value of the target temperature difference from exceeding the reasonable range. The value range of A can be set from 0 to 2, the value range of B can be set from 5 to 10, and the value range of C can be set from 0 to 10. For different inlet water temperatures, the corresponding deadband coefficients are also different. The calculation formula of the target temperature difference can be:

[0071] Target temperature difference △t = Max[Min(Ts, Tstop + An) - Tw_in, Bn]

[0072] Where, Ts is the set temperature, Tstop is the target shutdown temperature, Min(Ts, Tstop + An), this part calculates the smaller value among the set temperature, the target shutdown temperature, and An, which means that if the set temperature is lower than Tstop + An, the target temperature is the set temperature, and if the set temperature is higher than Tstop + An, the target temperature is Tstop + An; the calculation of the Max part means that if the difference between the target temperature and the inlet water temperature is higher than Bn, the difference between the target temperature and the inlet water temperature is used as the target temperature difference, and if the difference between the target temperature and the inlet water temperature is lower than Bn, the target temperature difference is Bn.

[0073] S303. Obtain the ambient temperature of the environmental space where the heat pump unit is located.

[0074] S304. Determine the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature;

[0075] S305. Control the compressor to operate at the target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency.

[0076] Specifically, in the embodiments of the present application, the maximum operating frequency of the compressor is determined based on the obtained ambient temperature, target temperature difference, and inlet water temperature. For the specific steps of then controlling the compressor to operate at the target operating frequency, please refer to the description in the embodiments of the above specification and will not be elaborated here.

[0077] Optionally, the target operating frequency can be any frequency between the current operating frequency and the maximum operating frequency.

[0078] In the embodiments of the present application, the target temperature of the heat pump unit is determined by the set temperature and the target shutdown temperature, and then the target temperature difference is determined by the target temperature and the inlet water temperature. It is possible to determine the target temperature difference based on the actual operating parameters of the heat pump unit, improving the accuracy of determining the target temperature difference; and by correcting the parameters of the original shutdown temperature of the heat pump unit with the ambient temperature, avoiding the situation where the original shutdown temperature does not conform to the current actual operating parameters of the heat pump unit, and improving the accuracy of determining the target shutdown temperature of the heat pump unit.

[0079] Based on Figure 1 the structural schematic diagram, the control device of the heat pump unit provided in the embodiments of the present application will be introduced in detail below with reference to FIG. 9. It should be noted that Figure 9 the control device of the heat pump unit in Figures 2 - 8 is used to execute the method of the embodiments shown in the present application. For the sake of convenience of description, only the parts related to the embodiments of the present application are shown. For the specific technical details not disclosed, please refer to the embodiments shown in the present application Figures 2 - 8 Specifically, the control device 1 of the heat pump unit includes:

[0080] An acquisition unit 11, configured to acquire the target temperature difference of the water-side heat exchanger and the ambient temperature of the environmental space where the heat pump unit is located, where the target temperature difference is the temperature difference required between the inlet water temperature and the outlet water temperature of the water-side heat exchanger;

[0081] A determination unit 12, configured to determine the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature;

[0082] A control unit 13, configured to control the compressor to operate at a target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency.

[0083] Optionally, the determination unit 12 includes:

[0084] An obtaining subunit 121, configured to obtain a first change trend of a target temperature difference;

[0085] A first determining subunit 122, configured to determine a first difference change interval corresponding to the target temperature difference within a temperature difference change interval based on the target temperature difference and the first change trend;

[0086] A second determining subunit 123, configured to determine a second difference change interval corresponding to the ambient temperature within an ambient temperature change interval based on the first difference change interval and the ambient temperature;

[0087] A third determining subunit 124, configured to determine a maximum operating frequency of a compressor based on the second difference change interval and a water inlet temperature.

[0088] Optionally, the second determining subunit 123 is specifically configured to:

[0089] Determine an ambient temperature change interval corresponding to the first difference change interval;

[0090] Obtain a second change trend of the ambient temperature;

[0091] Determine the second difference change interval corresponding to the ambient temperature within the ambient temperature change interval based on the second change trend and the ambient temperature.

[0092] Optionally, the third determining subunit 124 is specifically configured to:

[0093] Determine an ambient temperature change interval corresponding to the first difference change interval;

[0094] Obtain a second change trend of the ambient temperature;

[0095] Determine the second difference change interval corresponding to the ambient temperature within the ambient temperature change interval based on the second change trend and the ambient temperature.

[0096] Optionally, the obtaining subunit 121 is specifically configured to:

[0097] Obtain a previous target temperature difference adjacent to the target temperature difference;

[0098] If the target temperature difference is greater than the previous target temperature difference, determine that the first change trend is an upward trend;

[0099] If the target temperature difference is less than the previous target temperature difference, determine that the first change trend is a downward trend.

[0100] Optionally, the obtaining unit 11 includes:

[0101] A temperature obtaining subunit 111, configured to obtain a set temperature of a water-side heat exchanger and a target shutdown temperature of a heat pump unit;

[0102] A difference determination subunit 112 is configured to determine a target temperature difference of a water-side heat exchanger based on a set temperature, a target shutdown temperature, and a water inlet temperature.

[0103] Optionally, the difference determination subunit 112 is specifically configured to:

[0104] Determine a target temperature of the heat pump unit based on the set temperature and the target shutdown temperature;

[0105] Determine the target temperature difference based on the target temperature and the water inlet temperature.

[0106] Optionally, the temperature acquisition subunit 111 is specifically configured to:

[0107] Acquire the set temperature of the water-side heat exchanger;

[0108] Determine an original shutdown temperature of the heat pump unit based on the ambient temperature;

[0109] Perform parameter correction on the original shutdown temperature to obtain the target shutdown temperature.

[0110] In an embodiment of the present application, by acquiring the target temperature difference of the water-side heat exchanger and the ambient temperature of the environment space where the heat pump unit is located, determining the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the water inlet temperature, and controlling the compressor to operate at the target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency. Determining the maximum operating frequency of the compressor through the temperature difference (i.e., the target temperature difference) required between the water inlet temperature and the water outlet temperature of the water-side heat exchanger, the ambient temperature, and the water inlet temperature can prevent the operating frequency of the compressor from rising rapidly, control the operating frequency of the compressor to match the overall heat exchange capacity of the heat pump unit, avoid frequent start-stop of the heat pump unit, and improve the overall heat exchange efficiency of the heat pump unit.

[0111] Please refer to Figure 10 for a schematic structural diagram of a heat pump unit provided by an embodiment of the present application. As Figure 10 shown, the heat pump unit 500 includes a processor 501 and a memory 502. Among them, the processor 501 is electrically connected to the memory 502.

[0112] The processor 501 is the control center of the heat pump unit 500 and may include one or more processing cores. The processor 501 connects various parts of the entire heat pump unit 500 through various interfaces and lines. By running or calling the computer programs stored in the memory 502 and calling the data stored in the memory 502, it executes various functions of the heat pump unit 500 and processes data, thereby performing overall management and control of the heat pump unit 500. Optionally, the processor 501 may be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), or programmable logic array (PLA). The processor 501 may integrate one or a combination of several of a CPU, a graphics processing unit (GPU), and a modem, etc. Among them, the CPU mainly processes the operating system, user pages, application programs, etc.; the GPU is responsible for rendering and drawing the display content; the modem is used to process wireless communication. It can be understood that the above-mentioned modem may not be integrated into the processor 501 and may be implemented separately through a communication chip.

[0113] The memory 502 can be used to store software programs and modules. The processor 501 executes various functional applications and data processing by running the computer programs and modules stored in the memory 502. The memory 502 mainly includes a program storage area and a data storage area. Among them, the program storage area can store the operating system, computer programs required for at least one function, etc.; the data storage area can store data created according to the use of the heat pump unit 500.

[0114] In addition, the memory 502 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices. Correspondingly, the memory 502 may also include a memory controller to provide the processor 501 with access to the memory 502.

[0115] In this embodiment, the processor 501 in the heat pump unit 500 loads the instructions corresponding to the processes of one or more computer programs into the memory 502 according to the following steps, and the processor 501 runs the computer programs stored in the memory 502 to implement various functions as follows:

[0116] Obtain the target temperature difference of the water-side heat exchanger and the ambient temperature of the environment where the heat pump unit is located. The target temperature difference is the temperature difference that the inlet water temperature and the outlet water temperature of the water-side heat exchanger need to reach;

[0117] Determine the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature;

[0118] Control the compressor to operate at the target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency.

[0119] Optionally, when the processor 501 executes to determine the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature, it specifically executes:

[0120] Obtain the first change trend of the target temperature difference;

[0121] Based on the target temperature difference and the first change trend, determine the first difference change interval corresponding to the target temperature difference in the temperature difference change interval;

[0122] Based on the first difference change interval and the ambient temperature, determine the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval;

[0123] Based on the second difference change interval and the inlet water temperature, determine the maximum operating frequency of the compressor.

[0124] Optionally, when the processor 501 executes to determine the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval based on the first difference change interval and the ambient temperature, it specifically executes:

[0125] Determine the ambient temperature change interval corresponding to the first difference change interval;

[0126] Obtain the second change trend of the ambient temperature;

[0127] Based on the second change trend and the ambient temperature, determine the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval.

[0128] Optionally, when the processor 501 executes to determine the maximum operating frequency of the compressor based on the second difference change interval and the inlet water temperature, it specifically executes:

[0129] Determine the frequency change interval corresponding to the second difference change interval;

[0130] Obtain the third change trend of the inlet water temperature;

[0131] Based on the third change trend and the inlet water temperature in the frequency change interval, determine the maximum operating frequency of the compressor.

[0132] Optionally, when the processor 501 executes to obtain the first change trend of the target temperature difference, it specifically executes:

[0133] Obtain the previous target temperature difference adjacent to the target temperature difference;

[0134] If the target temperature difference is greater than the previous target temperature difference, determine that the first change trend is an upward trend;

[0135] If the target temperature difference is less than the previous target temperature difference, determine that the first change trend is a downward trend.

[0136] Optionally, when the processor 501 executes to obtain the target temperature difference of the water-side heat exchanger, it specifically executes:

[0137] Obtain the set temperature of the water-side heat exchanger and the target shutdown temperature of the heat pump unit;

[0138] Determine the target temperature difference of the water-side heat exchanger based on the set temperature, the target shutdown temperature, and the inlet water temperature.

[0139] Optionally, when the processor 501 executes to determine the target temperature difference of the water-side heat exchanger based on the set temperature, the target shutdown temperature, and the inlet water temperature, it specifically executes:

[0140] Determine the target temperature of the heat pump unit based on the set temperature and the target shutdown temperature;

[0141] Determine the target temperature difference based on the target temperature and the inlet water temperature.

[0142] Optionally, when the processor 501 executes to obtain the set temperature of the water-side heat exchanger and the target shutdown temperature of the heat pump unit, it specifically executes:

[0143] Obtain the set temperature of the water-side heat exchanger;

[0144] Determine the original shutdown temperature of the heat pump unit based on the ambient temperature;

[0145] Perform parameter correction on the original shutdown temperature to obtain the target shutdown temperature.

[0146] In the embodiments of the present application, by obtaining the target temperature difference of the water-side heat exchanger and the ambient temperature of the environmental space where the heat pump unit is located, determining the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature, and controlling the compressor to operate at the target operating frequency, the target operating frequency is less than or equal to the maximum operating frequency. By determining the maximum operating frequency of the compressor through the temperature difference (i.e., the target temperature difference) required between the inlet water temperature and the outlet water temperature of the water-side heat exchanger, the ambient temperature, and the inlet water temperature, the rapid increase of the operating frequency of the compressor is avoided, the operating frequency of the compressor is controlled to match the overall heat exchange capacity of the heat pump unit, the frequent start and stop of the heat pump unit are avoided, and the overall heat exchange efficiency of the heat pump unit is improved.

[0147] It should be understood that the device provided in the embodiments of the present application is used to execute the above-mentioned control method of a heat pump unit, so the same effects as the above-mentioned implementation method can be achieved.

[0148] In the case of adopting an integrated unit, the device may include a processing module and a storage module. Among them, when the device is applied to a heat pump unit, the processing module can be used to control and manage the actions of the heat pump unit. The storage module can be used to support the heat pump unit to execute relevant program codes, etc.

[0149] Among them, the processing module can be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits described in combination with the disclosure of this application. The processor can also be a combination that realizes computing functions, such as including a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module can be a memory.

[0150] In addition, the device provided in the embodiments of this application can specifically be a chip, a component, or a module. The chip may include a connected processor and a memory; among them, the memory is used to store instructions. When the processor calls and executes the instructions, the chip can execute a control method for a heat pump unit provided in the above embodiments.

[0151] The embodiments of this application also provide a computer-readable storage medium. Computer program code is stored in the computer-readable storage medium. When the computer program code runs on a computer, the computer is enabled to execute the above-related method steps to implement a control method for a heat pump unit provided in the above embodiments.

[0152] This embodiment also provides a computer program product. When the computer program product runs on a computer, the computer is enabled to execute the above-related steps to implement a control method for a heat pump unit provided in the above embodiments.

[0153] Among them, the device, computer-readable storage medium, computer program product, or chip provided in this embodiment are all used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be elaborated here.

[0154] Through the description of the above embodiments, those skilled in the art can understand that for the convenience and conciseness of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0155] In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the apparatus or unit can be in electrical, mechanical or other forms.

[0156] The above content is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A control method for a heat pump unit, characterized in that Applied to a heat pump unit, the heat pump unit includes a compressor and a water-side heat exchanger, and the method includes: Obtain the target temperature difference of the water-side heat exchanger and the ambient temperature of the environment where the heat pump unit is located, where the target temperature difference is the temperature difference that the inlet water temperature and the outlet water temperature of the water-side heat exchanger need to reach; Determine the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature; Control the compressor to operate at a target operating frequency, where the target operating frequency is less than or equal to the maximum operating frequency.

2. The method according to claim 1, wherein The determining the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature includes: Obtain the first change trend of the target temperature difference; Based on the target temperature difference and the first change trend, determine the first difference change interval corresponding to the target temperature difference in the temperature difference change interval; Based on the first difference change interval and the ambient temperature, determine the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval; Based on the second difference change interval and the inlet water temperature, determine the maximum operating frequency of the compressor.

3. The method according to claim 2, wherein The determining the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval based on the first difference change interval and the ambient temperature includes: Determine the ambient temperature change interval corresponding to the first difference change interval; Obtain the second change trend of the ambient temperature; Based on the second change trend and the ambient temperature, determine the second difference change interval corresponding to the ambient temperature in the ambient temperature change interval.

4. The method according to claim 2, characterized in that, The determining the maximum operating frequency of the compressor based on the second difference change interval and the inlet water temperature includes: Determine the frequency change interval corresponding to the second difference change interval; Obtain the third change trend of the inlet water temperature; Based on the third change trend and the inlet water temperature in the frequency change interval, determine the maximum operating frequency of the compressor.

5. The method according to any one of claims 2 to 4, characterized in that The obtaining the first change trend of the target temperature difference includes: Obtain the previous target temperature difference adjacent to the target temperature difference; If the target temperature difference is greater than the previous target temperature difference, determine that the first change trend is an upward trend; If the target temperature difference is less than the previous target temperature difference, determine that the first change trend is a downward trend.

6. The method according to claim 1, wherein The obtaining the target temperature difference of the water-side heat exchanger includes: Obtain the set temperature of the water-side heat exchanger and the target shutdown temperature of the heat pump unit; Based on the set temperature, the target shutdown temperature, and the inlet water temperature, determine the target temperature difference of the water-side heat exchanger.

7. The method according to claim 6, characterized in that, The determining the target temperature difference of the water-side heat exchanger based on the set temperature, the target shutdown temperature, and the inlet water temperature includes: Based on the set temperature and the target shutdown temperature, determine the target temperature of the heat pump unit; Based on the target temperature and the inlet water temperature, determine the target temperature difference.

8. The method according to claim 6, characterized in that, The obtaining the set temperature of the water-side heat exchanger and the target shutdown temperature of the heat pump unit includes: Obtain the set temperature of the water-side heat exchanger; Determine the original shutdown temperature of the heat pump unit based on the ambient temperature; Perform parameter correction on the original shutdown temperature to obtain the target shutdown temperature.

9. A control device for a heat pump unit, characterized in that, Applied to a heat pump unit, the heat pump unit includes a compressor and a water-side heat exchanger, and the device includes: An acquisition unit for acquiring the target temperature difference of the water-side heat exchanger and the ambient temperature of the environmental space where the heat pump unit is located, and the target temperature difference is the temperature difference required for the inlet water temperature and the outlet water temperature of the water-side heat exchanger; A determination unit for determining the maximum operating frequency of the compressor based on the target temperature difference, the ambient temperature, and the inlet water temperature; A control unit for controlling the compressor to operate at a target operating frequency, and the target operating frequency is less than or equal to the maximum operating frequency.

10. A heat pump unit, characterized in that, The heat pump unit includes: A memory for storing executable program code; A processor for calling and running the executable program code from the memory, so that the heat pump unit executes the method described in any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program code, and when the computer program code is executed, the method described in any one of claims 1 to 8 is implemented.

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