Water temperature determination method and device, heat pump unit, equipment and medium

Abstract

The invention provides a water temperature determining method and device, a heat pump unit, equipment and a medium, the method is applied to the technical field of heat pumps, and the method comprises the steps that if the heat pump unit is in a shutdown state, the historical saturation temperature, the historical highest exhaust temperature and the historical water inlet temperature of the heat pump unit in the historical starting and stopping process are obtained; based on the actual environment temperature, the historical highest exhaust temperature, the first saturation temperature and the second saturation temperature of the heat pump unit, a water inlet temperature correction coefficient is determined; and based on the first water inlet temperature, the second water inlet temperature and the water inlet temperature correction coefficient, the reference water inlet temperature of the heat pump unit entering the start-up state is determined, and therefore the problem of heat pump unit loss or low operation efficiency caused by unreasonable water inlet temperature setting is avoided.

Description

Technical Field

[0001] The present application relates to the field of heat pump technology, and in particular to a water temperature determination method, device, heat pump unit, equipment and medium. Background Art

[0002] In the related art, when controlling the heat pump unit to complete the heating process by itself, the heat pump unit is often controlled to enter the working state when the heat pump unit detects that the inlet water temperature reaches a preset fixed inlet water temperature value. However, the method of using a fixed inlet water temperature value fails to take into account the impact of ambient temperature on the condensing pressure and exhaust temperature. In actual use, it will cause the heat pump unit to frequently trigger high-pressure or high-temperature protection, thereby reducing the operating efficiency of the heat pump unit. Summary of the invention

[0003] The present application provides a water temperature determination method, device, heat pump unit, equipment and medium, which are intended to adjust and optimize the startup parameters of the heat pump unit to ensure that the heat pump unit is in a stable operating state. The technical solution is as follows:

[0004] In a first aspect, an embodiment of the present application provides a method for determining water temperature, comprising:

[0005] If the heat pump unit is in a shutdown state, obtain the historical saturation temperature, historical maximum exhaust temperature and historical inlet water temperature of the heat pump unit during the historical start-stop process. The historical saturation temperature is the first saturation temperature corresponding to the historical maximum condensing pressure of the refrigerant during the historical start-stop process, and the second saturation temperature corresponding to the frequency-limited condensing pressure. The historical inlet water temperature is the first inlet water temperature of the heat pump unit when it is greater than or equal to the shutdown temperature for the most recent time during the historical start-stop process, and the second inlet water temperature when it is less than the shutdown temperature for the most recent time during the historical start-stop process;

[0006] Determine the water inlet temperature correction coefficient based on the actual ambient temperature of the heat pump unit, the historical maximum exhaust temperature, the first saturation temperature and the second saturation temperature;

[0007] Based on the first inlet water temperature, the second inlet water temperature and the inlet water temperature correction coefficient, a reference inlet water temperature for the heat pump unit to enter a startup state is determined.

[0008] In a second aspect, an embodiment of the present application provides a water temperature determination device, comprising:

[0009] A historical temperature acquisition unit, for acquiring the historical saturation temperature, the historical maximum exhaust temperature and the historical water inlet temperature of the heat pump unit during the historical start-stop process if the heat pump unit is in a shutdown state, wherein the historical saturation temperature is the first saturation temperature corresponding to the historical maximum condensing pressure of the refrigerant during the historical start-stop process, and the second saturation temperature corresponding to the frequency-limited condensing pressure; the historical water inlet temperature is the first water inlet temperature of the heat pump unit when it was greater than or equal to the shutdown temperature for the most recent time during the historical start-stop process, and the second water inlet temperature when it was less than the shutdown temperature for the most recent time during the historical start-stop process;

[0010] A correction coefficient generating unit, used for determining a water inlet temperature correction coefficient based on an actual ambient temperature of the heat pump unit, a historical maximum exhaust temperature, a first saturation temperature, and a second saturation temperature;

[0011] The reference temperature calculation unit is used to determine the reference water inlet temperature for the heat pump unit to enter the startup state based on the first water inlet temperature, the second water inlet temperature and the water inlet temperature correction coefficient.

[0012] In a third aspect, an embodiment of the present application provides a heat pump unit, the heat pump unit comprising a controller, and the controller is used to execute any of the above methods for determining the water temperature.

[0013] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, any of the above methods for determining water temperature is implemented.

[0014] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, any of the above methods for determining the water temperature is implemented.

[0015] In the above technical solution, by obtaining the historical saturation temperature, the historical highest exhaust temperature and the historical inlet water temperature under different conditions during the historical start and stop process of the heat pump unit, the past operation information of the heat pump unit can be fully utilized. On this basis, the inlet water temperature correction coefficient is determined according to the actual ambient temperature, the historical highest exhaust temperature and the historical saturation temperature. Finally, the reference inlet water temperature for the heat pump unit to enter the startup state is determined based on the first inlet water temperature, the second inlet water temperature and the inlet water temperature correction coefficient. This method of comprehensively considering multiple factors to determine the reference inlet water temperature can improve the accuracy of the inlet water temperature setting when the heat pump unit is started, which helps to optimize the startup process of the heat pump unit and avoid the problem of heat pump unit loss or low operating efficiency due to unreasonable inlet water temperature setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a scene schematic diagram of a method for determining water temperature provided in an embodiment of the present application;

[0018] Figure 2 It is a flow chart of a method for determining water temperature provided in an embodiment of the present application;

[0019] Figure 3 It is a flow chart of a method for determining water temperature provided in an embodiment of the present application;

[0020] Figure 4 It is a flow chart of a method for determining water temperature provided in an embodiment of the present application;

[0021] Figure 5 It is a flow chart of a method for determining water temperature provided in an embodiment of the present application;

[0022] Figure 6 It is a flow chart of a method for determining water temperature provided in an embodiment of the present application;

[0023] Figure 7 is a structural schematic diagram of a water temperature determination device provided in an embodiment of the present application;

[0024] Figure 8 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0026] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0027] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0028] In order to improve the working efficiency of the heat pump unit, the embodiment of the present application provides a water temperature determination method, the execution subject of the water temperature determination method is a controller, wherein the controller can be a device equipped with a water temperature determination device or an electronic device. The following is a detailed description, and it should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0029] See also Figure 1 , Figure 1 Schematic diagram of a water temperature determination method provided in an embodiment of the present application. Figure 1 As shown, the heat pump unit may at least include a controller, a compressor 1, a first heat exchanger 2, a second heat exchanger 3, an exhaust temperature sensor 4, a pressure sensor 5, an evaporation temperature sensor 6, an ambient temperature sensor 7, a water inlet temperature sensor 8 and a water outlet temperature sensor 9.

[0030] The controller is electrically connected to the compressor 1, the first heat exchanger 2, the second heat exchanger 3, the exhaust temperature sensor 4, the pressure sensor 5, the evaporation temperature sensor 6, the ambient temperature sensor 7, the water inlet temperature sensor 8 and the water outlet temperature sensor 9 respectively.

[0031] The exhaust temperature sensor 4 is arranged at the gas pipeline of the exhaust port of the compressor. The exhaust temperature sensor 4 is used to monitor the temperature of the exhaust gas at the exhaust port of the compressor 1 in real time to obtain the temperature condition of the exhaust end of the compressor 1. The pressure sensor 5 is located in the gas pipeline above the exhaust port and is used to obtain the condensation pressure data of the gas pipeline. The evaporation temperature sensor 6 is arranged on the gas pipeline in the first heat exchanger 2. The evaporation temperature sensor 6 is used to monitor the evaporation temperature generated by the first heat exchanger 2 during the evaporation process. The ambient temperature sensor 7 is arranged in the first heat exchanger 2 to obtain the ambient temperature of the heat pump unit. The water inlet temperature sensor 8 is arranged on the water inlet pipeline on the water side of the second heat exchanger 3 to monitor the water temperature of the water entering the water inlet pipeline of the second heat exchanger 3. The water outlet temperature sensor 9 is arranged on the water outlet pipeline on the water side of the second heat exchanger 3 to monitor the water temperature of the water in the water outlet pipeline after heat exchange in the second heat exchanger 3.

[0032] In the embodiment of the present application, when the controller detects that the heat pump unit is in a shutdown state, it calls the exhaust temperature sensor 4, the pressure sensor 5, the evaporation temperature sensor 6, the water inlet temperature sensor 8 and the water outlet temperature sensor 9 respectively to obtain the historical saturation temperature, the historical maximum exhaust temperature and the historical water inlet temperature generated by the heat pump unit during the historical start-stop process, wherein the setting period of the historical start-stop process can be set according to the actual operating scenario, and no specific limitation is made here.

[0033] It should be noted that a reference database has been established in advance in this application, which stores the correspondence between different condensing pressures and saturation temperatures, the correspondence between evaporation temperature data and frequency-limited condensing pressures, the correspondence between actual ambient temperature and the exhaust temperature correction coefficient corresponding to the maximum exhaust temperature, and the correspondence between the exhaust temperature correction coefficient and the water inlet temperature correction coefficient corresponding to the historical saturation temperature. For example, when it is necessary to obtain the saturation temperature corresponding to a certain condensing pressure, or the frequency-limited condensing pressure corresponding to a certain evaporation temperature data, the corresponding result can be quickly obtained by directly querying in this pre-set reference database, thereby avoiding errors and time consumption caused by complex calculations during actual operation.

[0034] Specifically, the condensing pressure data monitored by the pressure sensor 5 is called, and the condensing pressure data is traversed to obtain the historical maximum condensing pressure reached by the refrigerant in the heat pump unit during the historical start-stop process, and a query statement is generated based on the historical maximum condensing pressure to query the first saturation temperature corresponding to the maximum condensing pressure in the reference database. The evaporation temperature sensor 6 is called to obtain the evaporation temperature data of the first heat exchanger during the historical start-stop process, and the historical highest evaporation temperature generated when the heat pump unit is in a limited frequency state is determined from the evaporation temperature data, and a query statement is generated based on the historical highest evaporation temperature to query the limited frequency condensing pressure corresponding to the historical highest evaporation temperature in the reference database. After obtaining the limited frequency condensing pressure, a query statement is generated based on the limited frequency condensing pressure to find the second saturation temperature corresponding to the limited frequency condensing pressure in the reference database. The first saturation temperature and the second saturation temperature are integrated to generate the historical saturation temperature.

[0035] The exhaust temperature data monitored by the exhaust temperature sensor 4 is called, and the exhaust temperature data is traversed to determine the historical highest exhaust temperature. The historical inlet water temperature data monitored by the inlet water temperature sensor 8 is called, wherein the historical inlet water temperature includes a first inlet water temperature and a second inlet water temperature. The first inlet water temperature is the inlet water temperature recorded in the first start and stop process of the heat pump unit, with the current time as the reference back, when the inlet water temperature is greater than or equal to the set shutdown temperature for the first time. The second inlet water temperature is the inlet water temperature recorded in the first start and stop process of the heat pump unit, with the current time as the reference back, when the inlet water temperature is less than the set shutdown temperature for the first time.

[0036] The ambient temperature sensor 7 is called to obtain the actual ambient temperature of the heat pump unit, and based on the actual ambient temperature and the historical highest exhaust temperature, a query statement is generated and executed in a preset reference database to determine the exhaust temperature correction coefficient. Based on the exhaust temperature correction coefficient and the first saturation temperature and the second saturation temperature in the historical saturation temperature, a query statement is generated and executed in a preset reference database to determine the inlet and outlet water temperature correction coefficient, wherein the exhaust temperature correction coefficient and the inlet water temperature correction coefficient are a specific temperature value, which is not specifically limited here.

[0037] The first water inlet temperature is subtracted from the water inlet temperature correction coefficient to obtain the corrected water inlet temperature, and the corrected water inlet temperature is compared with the second water inlet temperature. If the corrected water inlet temperature is less than the second water inlet temperature, the corrected water inlet temperature is determined as the reference water inlet temperature for the heat pump unit to enter the startup state; if the corrected water inlet temperature is greater than the second water inlet temperature, the second water inlet temperature is determined as the reference water inlet temperature.

[0038] The inlet water temperature sensor 8 is called to obtain the real-time inlet water temperature when the heat pump unit is in the shutdown state, which is recorded as the third inlet water temperature. If it is detected that the third inlet water temperature is equal to the reference inlet water temperature, the heat pump unit is controlled to enter the startup state.

[0039] based on Figure 1 The scene diagram shown below will be combined with Figure 2-Figure 6 , a water temperature determination method provided in an embodiment of the present application is introduced in detail.

[0040] When controlling the operation of heat pump units, related technical solutions often use fixed water inlet temperature values ​​to determine the start-up. However, this method ignores the impact of ambient temperature on condensation and exhaust temperatures. In actual use, this will cause the heat pump unit to frequently trigger high-pressure or high-temperature protection, resulting in operation interruptions and adjustments, greatly reducing operating efficiency.

[0041] Based on the above content, the present application embodiment proposes a method for determining water temperature. Figure 2 , Figure 2 is a flow chart of a method for determining water temperature provided in an embodiment of the present application. Figure 2 As shown, the method of the embodiment of the present application may include the following steps S101-S103.

[0042] S101: If the heat pump unit is in a shutdown state, obtain the historical saturation temperature, the historical maximum exhaust temperature, and the historical water inlet temperature of the heat pump unit during the historical start and stop process.

[0043] It should be noted that the heat pump unit is in a shutdown condition when the outlet water temperature sensor detects that the outlet water temperature at the outlet of the outlet pipe reaches the preset outlet water temperature threshold and the inlet water temperature sensor detects that the inlet water temperature at the inlet of the inlet pipe reaches the preset inlet water temperature threshold, then the heat pump unit is controlled to enter the shutdown state. The specific shutdown condition can be set according to the actual use scenario and is not specifically limited here.

[0044] Specifically, when the controller detects that the heat pump unit is in a shutdown state, it calls the condensing pressure data monitored by the pressure sensor 5, and performs data traversal on the condensing pressure data to obtain the historical maximum condensing pressure reached by the refrigerant in the heat pump unit during the historical start-stop process. A first temperature query statement is generated based on the historical maximum condensing pressure, and the first temperature query statement is executed in the reference database to query the first saturation temperature corresponding to the maximum condensing pressure.

[0045] The evaporation temperature data of the first heat exchanger monitored by the evaporation temperature sensor 6 during the historical start-stop process is obtained, and the maximum evaporation temperature data is searched from the evaporation temperature data, and the frequency-limited condensation pressure corresponding to the historical maximum evaporation temperature is searched in the reference database. A second temperature query statement is generated based on the found frequency-limited condensation pressure, and the second temperature query statement is executed in the reference database to query the second saturation temperature corresponding to the frequency-limited condensation pressure. The first saturation temperature and the second saturation temperature are integrated to generate the historical saturation temperature.

[0046] The exhaust temperature data monitored by the exhaust temperature sensor 4 is called, and the exhaust temperature data is traversed to determine the historical highest exhaust temperature. The historical inlet water temperature monitored by the inlet water temperature sensor 8 is called, wherein the historical inlet water temperature includes a first inlet water temperature and a second inlet water temperature. The first inlet water temperature is the inlet water temperature recorded in the first start and stop process of the heat pump unit, with the current time as the reference back, when the inlet water temperature is greater than or equal to the set shutdown temperature for the first time. The second inlet water temperature is the inlet water temperature recorded in the first start and stop process of the heat pump unit, with the current time as the reference back, when the inlet water temperature is less than the set shutdown temperature for the first time.

[0047] S102, determining a water inlet temperature correction coefficient based on the actual ambient temperature of the heat pump unit, the historical highest exhaust temperature, the first saturation temperature, and the second saturation temperature.

[0048] Specifically, the ambient temperature sensor 7 is called to obtain the actual ambient temperature of the heat pump unit at the current moment, a third query statement is generated based on the actual ambient temperature and the historical highest exhaust temperature, and the third query statement is executed in the reference database to determine the exhaust temperature correction coefficient.

[0049] Further, the first saturation temperature is subtracted from the second saturation temperature to obtain a saturation temperature difference, and the saturation temperature difference is added to the exhaust temperature correction coefficient to determine the inlet water temperature correction coefficient.

[0050] S103, determining a reference water inlet temperature for the heat pump unit to enter a startup state based on the first water inlet temperature, the second water inlet temperature and the water inlet temperature correction coefficient.

[0051] Specifically, the first water inlet temperature is subtracted from the water inlet temperature correction coefficient to obtain the corrected water inlet temperature, and the corrected water inlet temperature is compared with the second water inlet temperature. If the corrected water inlet temperature is less than the second water inlet temperature, the corrected water inlet temperature is determined as the reference water inlet temperature for the heat pump unit to enter the startup state; if the corrected water inlet temperature is greater than the second water inlet temperature, the second water inlet temperature is determined as the reference water inlet temperature.

[0052] From the above, it can be seen that by obtaining the historical saturation temperature, historical maximum exhaust temperature and historical inlet water temperature under different conditions during the historical start and stop process of the heat pump unit, the past operation information of the heat pump unit can be fully utilized. On this basis, the inlet water temperature correction coefficient is determined according to the actual ambient temperature, the historical maximum exhaust temperature and the historical saturation temperature. Finally, the reference inlet water temperature for the heat pump unit to enter the startup state is determined based on the first inlet water temperature, the second inlet water temperature and the inlet water temperature correction coefficient. This method of comprehensively considering multiple factors to determine the reference inlet water temperature can improve the accuracy of the inlet water temperature setting when the heat pump unit is started, which helps to optimize the startup process of the heat pump unit and avoid the problem of heat pump unit loss or low operating efficiency due to unreasonable inlet water temperature setting.

[0053] In a feasible implementation manner, a method for determining water temperature provided in an embodiment of the present application may include the following steps:

[0054] If it is detected that the third water inlet temperature at the water inlet of the heat pump unit is less than or equal to the reference water inlet temperature, the heat pump unit is controlled to enter a start-up state.

[0055] Specifically, the water inlet temperature sensor 8 is called to obtain the real-time water inlet temperature when the heat pump unit is in the shutdown state, which is recorded as the third water inlet temperature. If it is detected that the third water inlet temperature is equal to the reference water inlet temperature, the heat pump unit is controlled to enter the startup state.

[0056] For example, the reference water inlet temperature is 51°C, and the third water inlet temperature detected by the water inlet temperature sensor 8 is 49°C, then the heat pump unit is controlled to remain in the shutdown state. At a certain moment, the third water inlet temperature is detected to be 51°C, and the heat pump unit is controlled to enter the startup state.

[0057] To improve the calculation accuracy of the startup water inlet temperature. Figure 3 , Figure 3 is a flow chart of a method for determining water temperature provided in an embodiment of the present application. Figure 3 As shown, the method of the embodiment of the present application may include the following steps S201-S202.

[0058] S201, determining an exhaust temperature correction coefficient based on the actual ambient temperature and the historical highest exhaust temperature.

[0059] Specifically, the ambient temperature sensor 7 is called to obtain the actual ambient temperature of the heat pump unit at the current moment, and the historical maximum exhaust temperature is determined from the evaporation temperature data monitored by the evaporation temperature sensor 6. A third query statement is generated according to the actual ambient temperature and the historical maximum exhaust temperature, and the third query statement is executed in the comparison database to obtain the exhaust temperature correction coefficient.

[0060] For example, the actual ambient temperature is 25°C and the historical highest exhaust temperature is 80°C, then the third query statement generated is "SELECT correction_factor FROM coefficient_table WHERE actual_env_temp=25AND max_exhaust_temp=80", which means querying the exhaust temperature correction coefficient corresponding to the actual ambient temperature of 25°C and the historical highest exhaust temperature of 80°C from the coefficient_table data table in the reference database, wherein the coefficient_table data table records the correspondence between the actual ambient temperature, the historical highest exhaust temperature and the exhaust temperature correction coefficient.

[0061] S202: Determine a water inlet temperature correction coefficient based on the exhaust temperature correction coefficient, the first saturation temperature, and the second saturation temperature.

[0062] In an embodiment of the present application, the first saturation temperature is the saturation temperature corresponding to the highest condensation pressure queried from the reference database, and the second saturation temperature is the saturation temperature corresponding to the frequency-limiting condensation pressure queried from the reference database.

[0063] Specifically, the first saturation temperature is subtracted from the second saturation temperature and the exhaust temperature correction coefficient obtained in S201 is added to obtain the water inlet temperature correction coefficient.

[0064] From the above, we can know that the exhaust temperature correction coefficient is determined by the ambient temperature and the highest exhaust temperature in history, and on this basis, the inlet water temperature correction coefficient is obtained by combining the first and second saturation temperatures. The inlet water temperature can be accurately controlled to further improve the stability and operating efficiency of the heat pump unit.

[0065] In order to further improve the calculation accuracy of the startup water inlet temperature. Figure 4 , Figure 4 is a flow chart of a method for determining water temperature provided in an embodiment of the present application. Figure 4 As shown, the method of the embodiment of the present application may include the following steps S301-S302.

[0066] S301, subtract the first saturation temperature from the second saturation temperature to obtain a saturation temperature difference.

[0067] In an embodiment of the present application, the first saturation temperature is the saturation temperature corresponding to the highest condensation pressure queried from the reference database, and the second saturation temperature is the saturation temperature corresponding to the frequency-limiting condensation pressure queried from the reference database.

[0068] Exemplarily, the first saturation temperature is 65°C, and the second saturation temperature is 63°C, then the saturation temperature difference is determined to be 65°C-63°C=2°C.

[0069] S302, adding the saturation temperature difference to the exhaust temperature correction coefficient to obtain the water inlet temperature correction coefficient.

[0070] For example, the saturation temperature difference is 2°C, and according to the actual ambient temperature of 25°C and the historical highest exhaust temperature of 80°C, the exhaust temperature correction coefficient is 1°C. Then the water inlet temperature correction coefficient is 2°C+1°C=3°C.

[0071] From the above, it can be seen that by obtaining the temperature difference between the first saturation temperature and the second saturation temperature, and adding the saturation temperature difference to the exhaust temperature correction coefficient, the inlet water temperature correction coefficient is obtained, and then the inlet water temperature can be accurately controlled according to the inlet water temperature correction coefficient to ensure the efficient operation of the heat pump unit, reduce failures caused by poor temperature control, and improve the operating stability of the heat pump unit.

[0072] Since the heat pump unit will generate a large amount of monitoring data during operation, if the monitoring data is calculated and processed in real time, it will cause a large time overhead, thus affecting the efficiency of the heat pump unit. Therefore, it is necessary to improve the processing speed of the monitoring data. Figure 5 , Figure 5 is a flow chart of a method for determining water temperature provided in an embodiment of the present application. Figure 5 As shown, the method of the embodiment of the present application may include the following steps S401-S404.

[0073] S401, calling the condensation pressure data monitored by the pressure sensor, determining the historical maximum condensation pressure from the condensation pressure data, and determining the first saturation temperature corresponding to the historical maximum condensation pressure.

[0074] Specifically, first, the condensing pressure data monitored by the pressure sensor 5 is called. Then, the condensing pressure data is traversed to find the historical maximum condensing pressure reached by the refrigerant during the historical start-stop process. A query statement is generated based on the historical maximum condensing pressure, and the query statement is executed in a pre-set reference database to quickly find the first saturation temperature corresponding to the historical maximum condensing pressure.

[0075] For example, the condensation pressure data monitored by the pressure sensor 5 is {2.0MPa, 2.5MPa, 3.0MPa, 2.8MPa}, MegaPascal (MPa), and after data traversal, it is found that the historical maximum condensation pressure is 3.0MPa. By querying the reference database, it is known that the first saturation temperature corresponding to 3.0MPa is 60°C.

[0076] S402, calling the evaporation temperature data monitored by the evaporation temperature sensor, determining the frequency-limiting condensation pressure from the evaporation temperature data, and determining the second saturation temperature corresponding to the frequency-limiting condensation pressure.

[0077] Specifically, the evaporation temperature data monitored by the evaporation temperature sensor 6 is called. The maximum frequency-limited condensing pressure generated when the heat pump unit is in the frequency-limited state is determined from the evaporation temperature data. Then, a query statement is generated based on the frequency-limited condensing pressure, and the second saturation temperature corresponding to the frequency-limited condensing pressure is queried in the reference database.

[0078] For example, the evaporation temperature data monitored by the evaporation temperature sensor 6 show that when the unit is in the frequency-limited state, the corresponding maximum frequency-limited condensing pressure is 2.6 MPa. According to the reference database, the second saturation temperature corresponding to 2.6 MPa is 55°C.

[0079] S403, calling exhaust temperature data monitored by the exhaust temperature sensor, and determining the historical highest exhaust temperature from the exhaust temperature data.

[0080] Specifically, the exhaust temperature sensor 4 is called to monitor the exhaust temperature data. Then, the exhaust temperature data is traversed and analyzed to find out the historical highest exhaust temperature.

[0081] Exemplarily, the exhaust temperature data recorded by the exhaust temperature sensor 4 include {80° C., 85° C., 82° C., 78° C.}, and through data traversal, it is determined that the highest exhaust temperature in history is 85° C.

[0082] S404: Analyze the inlet water temperature monitored by the inlet water temperature sensor to determine the historical inlet water temperature.

[0083] Specifically, the water inlet temperature sensor 8 is called to monitor the water inlet temperature data. Based on the current time, the historical start and stop conditions when the water inlet temperature is greater than or equal to the set shutdown temperature are found for the first time, and the water inlet temperature is recorded as the first water inlet temperature; at the same time, the historical start and stop conditions when the water inlet temperature is less than the set shutdown temperature are found for the first time, and the water inlet temperature is recorded as the second water inlet temperature.

[0084] For example, it is assumed that the historical inlet water temperature data and the corresponding start and stop conditions recorded by the inlet water temperature sensor 8 are as follows:

[0085] The first historical start and stop: the water inlet temperature during shutdown is 40°C (lower than the set shutdown temperature of 45°C).

[0086] The second historical start and stop: the water inlet temperature during shutdown is 50°C (greater than or equal to the set shutdown temperature of 45°C).

[0087] The third historical start and stop: the water inlet temperature during shutdown was 42°C (lower than the set shutdown temperature of 45°C).

[0088] Since the third historical start-stop is closest to the current moment, the first inlet water temperature is determined to be 50°C and the second inlet water temperature is determined to be 42°C.

[0089] From the above, it can be seen that by obtaining the historical maximum condensing pressure and its corresponding first saturation temperature and the determination of the frequency-limited condensing pressure and the corresponding second saturation temperature, data support is provided for evaluating the working status of the heat pump unit. By obtaining the historical highest exhaust temperature, it is convenient to set a reasonable safety threshold to prevent damage to the equipment due to excessively high exhaust temperature. By obtaining the first inlet water temperature and the second inlet water temperature, the accuracy of setting the startup reference inlet water temperature can be improved, effectively avoiding the inefficiency and failure risks caused by fixed parameter control.

[0090] Due to the influence of ambient temperature on condensing pressure and exhaust temperature, the heat pump unit is prone to frequently triggering high pressure or high temperature protection, reducing operating efficiency. Therefore, it is necessary to prevent heat pump unit operation failures caused by unreasonable water inlet temperature settings and ensure that the heat pump unit can operate stably and efficiently under different environmental conditions and operating conditions. Figure 6 , Figure 6 is a flow chart of a method for determining water temperature provided in an embodiment of the present application. Figure 6 As shown, the method of the embodiment of the present application may include the following steps S501-S503.

[0091] S501, subtracting a water inlet temperature correction coefficient from the first water inlet temperature to obtain a corrected water inlet temperature.

[0092] Exemplarily, the first inlet water temperature is 50°C, and the inlet water temperature correction coefficient is 5°C, then the corrected inlet water temperature is 50°C-5°C=45°C.

[0093] S502: If the corrected water inlet temperature is lower than the second water inlet temperature, the corrected water inlet temperature is determined as a reference water inlet temperature.

[0094] Specifically, the relationship between the corrected water inlet temperature and the second water inlet temperature is determined. If the corrected water inlet temperature is less than the second water inlet temperature, it means that the corrected temperature is lower, so the corrected water inlet temperature is determined as the reference water inlet temperature.

[0095] Exemplarily, the second inlet water temperature is 48° C., and the calculated corrected inlet water temperature is 45° C. Since the corrected inlet water temperature is lower than the second inlet water temperature, the corrected inlet water temperature of 45° C. is determined as the reference inlet water temperature.

[0096] S503: If the corrected water inlet temperature is greater than the second water inlet temperature, the second water inlet temperature is determined as a reference water inlet temperature.

[0097] Specifically, the relationship between the corrected water inlet temperature and the second water inlet temperature is determined. If the corrected water inlet temperature is greater than the second water inlet temperature, the second water inlet temperature is determined as the reference water inlet temperature.

[0098] Exemplarily, the second water inlet temperature is 43° C., and the calculated corrected water inlet temperature is 45° C. Since the corrected water inlet temperature is greater than the second water inlet temperature, the second water inlet temperature of 43° C. is determined as the reference water inlet temperature.

[0099] From the above, it can be seen that the corrected inlet water temperature is obtained by subtracting the inlet water temperature correction coefficient from the first inlet water temperature. This process integrates the consideration of multiple factors such as ambient temperature and historical operating data, thereby improving the accuracy of the initial inlet water temperature. The reference inlet water temperature is determined based on the comparison between the corrected inlet water temperature and the second inlet water temperature. If the corrected inlet water temperature is lower than the second inlet water temperature, the corrected inlet water temperature is determined as the reference inlet water temperature, otherwise the second inlet water temperature shall prevail. This method ensures that the reference inlet water temperature is always in a reasonable range that meets the operating requirements of the heat pump unit, avoids problems such as high pressure and high temperature protection caused by abnormal inlet water temperature, maintains the stable operation of the heat pump unit, and effectively improves the operating efficiency of the heat pump unit.

[0100] In a feasible implementation manner, a method for determining water temperature provided in an embodiment of the present application may include the following steps:

[0101] If the reference water inlet temperature is greater than the preset temperature range, the preset default water inlet temperature is determined as the reference water inlet temperature.

[0102] Exemplarily, the preset temperature range is 40°C-50°C, and the preset default water inlet temperature is 45°C. When the calculated reference water inlet temperature is 55°C, since the reference water inlet temperature is greater than the preset temperature range, the preset default water inlet temperature of 45°C will be determined as the reference water inlet temperature, thereby ensuring that the unit operates under appropriate water inlet temperature conditions, preventing problems such as high pressure protection and excessive exhaust temperature due to abnormal water inlet temperature, and maintaining stable operation of the heat pump unit.

[0103] based on Figure 1 The following is a schematic diagram of the scene. Figure 7 , the water temperature determination device provided in the embodiment of the present application is introduced in detail. It should be noted that, Figure 7 The water temperature determination device in the present application is used to implement Figure 2-Figure 6 For the convenience of explanation, only the part related to the embodiment of the present application is shown. For the specific technical details not disclosed, please refer to the present application. Figure 2-Figure 6In the embodiment shown, the water temperature determination device 600 may include a historical temperature acquisition unit 601, a correction coefficient generation unit 602 and a reference temperature calculation unit 603, as follows:

[0104] The historical temperature acquisition unit 601 is used to acquire the historical saturation temperature, the historical maximum exhaust temperature and the historical water inlet temperature of the heat pump unit during the historical start-stop process if the heat pump unit is in the shutdown state. The historical saturation temperature is the first saturation temperature corresponding to the historical maximum condensing pressure of the refrigerant during the historical start-stop process, and the second saturation temperature corresponding to the frequency-limited condensing pressure. The historical water inlet temperature is the first water inlet temperature of the heat pump unit when it is greater than or equal to the shutdown temperature for the most recent time during the historical start-stop process, and the second water inlet temperature when it is less than the shutdown temperature for the most recent time during the historical start-stop process;

[0105] The correction coefficient generating unit 602 is used to determine the water inlet temperature correction coefficient based on the actual ambient temperature of the heat pump unit, the historical maximum exhaust temperature, the first saturation temperature and the second saturation temperature;

[0106] The reference temperature calculation unit 603 is used to determine the reference inlet water temperature for the heat pump unit to enter the startup state based on the first inlet water temperature, the second inlet water temperature and the inlet water temperature correction coefficient.

[0107] In some embodiments, the startup water inlet temperature determination device 600 also includes a state control unit.

[0108] The console control unit is used to control the heat pump unit to enter the startup state if it is detected that the third water inlet temperature at the water inlet of the heat pump unit is less than or equal to the reference water inlet temperature.

[0109] In some embodiments, the correction coefficient generating unit 602 further includes an exhaust temperature correction coefficient determining unit and a water inlet temperature correction coefficient determining unit.

[0110] An exhaust temperature correction coefficient determination unit, used to determine the exhaust temperature correction coefficient based on the actual ambient temperature and the historical maximum exhaust temperature;

[0111] The water inlet temperature correction coefficient unit is used to determine the water inlet temperature correction coefficient based on the exhaust temperature correction coefficient, the first saturation temperature and the second saturation temperature.

[0112] In some embodiments, the correction coefficient generating unit 602 further includes a first calculating unit and a second calculating unit.

[0113] A first calculation unit, used for subtracting the first saturation temperature from the second saturation temperature to obtain a saturation temperature difference;

[0114] The second calculation unit is used to add the saturation temperature difference and the exhaust temperature correction coefficient to obtain the water inlet temperature correction coefficient.

[0115] In some embodiments, the historical temperature acquisition unit 601 further includes a first calling unit, a second calling unit, a third calling unit and an analyzing unit.

[0116] A first calling unit is used to call the condensing pressure data monitored by the pressure sensor, determine the historical maximum condensing pressure from the condensing pressure data, and determine the first saturation temperature corresponding to the historical maximum condensing pressure;

[0117] A second calling unit is used to call the evaporation temperature data monitored by the evaporation temperature sensor, determine the frequency-limiting condensation pressure from the evaporation temperature data, and determine the second saturation temperature corresponding to the frequency-limiting condensation pressure;

[0118] A third calling unit is used to call the exhaust temperature data monitored by the exhaust temperature sensor and determine the historical maximum exhaust temperature from the exhaust temperature data;

[0119] The analysis unit is used to analyze the inlet water temperature monitored by the inlet water temperature sensor to determine the historical inlet water temperature

[0120] In some embodiments, the reference temperature calculation unit 603 further includes a third calculation unit, a first determination unit, and a second determination unit.

[0121] a third calculation unit, configured to subtract a water inlet temperature correction coefficient from the first water inlet temperature to obtain a corrected water inlet temperature;

[0122] a first determination unit, configured to determine the corrected water inlet temperature as a reference water inlet temperature if the corrected water inlet temperature is less than the second water inlet temperature;

[0123] The second determination unit is configured to determine the second inlet water temperature as a reference inlet water temperature if the corrected inlet water temperature is greater than the second inlet water temperature.

[0124] In some embodiments, the reference temperature calculation unit 603 further includes a third determination unit.

[0125] The third determination unit is configured to determine a preset default water inlet temperature as the reference water inlet temperature if the reference water inlet temperature is greater than a preset temperature range.

[0126] In an embodiment of the present application, by obtaining the historical saturation temperature, the historical maximum exhaust temperature, and the historical inlet water temperature under different conditions during the historical start and stop process of the heat pump unit, the past operation information of the heat pump unit can be fully utilized. On this basis, the inlet water temperature correction coefficient is determined according to the actual ambient temperature, the historical maximum exhaust temperature, and the historical saturation temperature. Finally, the reference inlet water temperature for the heat pump unit to enter the startup state is determined based on the first inlet water temperature, the second inlet water temperature, and the inlet water temperature correction coefficient. This method of comprehensively considering multiple factors to determine the reference inlet water temperature can improve the accuracy of the inlet water temperature setting when the heat pump unit is started, which helps to optimize the startup process of the heat pump unit and avoid the problem of heat pump unit loss or low operating efficiency due to unreasonable inlet water temperature setting.

[0127] In addition, the water temperature determination device provided in the above embodiment and a water temperature determination method embodiment belong to the same concept, and the implementation process thereof is detailed in the method embodiment and will not be repeated here.

[0128] The serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0129] See also Figure 8 , Figure 8 A schematic diagram of the structure of an electronic device is provided for an embodiment of the present application. Figure 8 As shown, the electronic device 700 includes a processor 701 and a memory 702. The processor 701 is electrically connected to the memory 702.

[0130] The processor 701 is the control center of the electronic device 700 and may include one or more processing cores. The processor 701 uses various interfaces and lines to connect the various parts of the entire electronic device, and executes various functions of the electronic device and processes data by running or calling the computer program stored in the memory 702, and calling the data stored in the memory 702, so as to control the electronic device as a whole. Optionally, the processor 701 can be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), and programmable logic array (PLA). The processor 701 can integrate one or a combination of CPU, graphics processing unit (GPU), modem, etc. Among them, the CPU mainly processes the operating system, user pages, and applications; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 701, and may be implemented separately through a communication chip.

[0131] The memory 702 may be used to store software programs and modules, and the processor 701 executes various functional applications and data processing by running computer programs and modules stored in the memory 702. The memory 702 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, a computer program required for at least one function, etc.; the data storage area may store data created according to the use of the electronic device, etc.

[0132] In addition, the memory 702 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 702 may also include a memory controller to provide the processor 701 with access to the memory 702.

[0133] In the embodiment of the present application, the processor 701 in the electronic device 700 loads instructions corresponding to the processes of one or more computer programs into the memory 702 according to the following steps, and the processor 701 runs the computer program stored in the memory 702 to implement various functions, as follows:

[0134] If the heat pump unit is in a shutdown state, obtain the historical saturation temperature, historical maximum exhaust temperature and historical inlet water temperature of the heat pump unit during the historical start-stop process. The historical saturation temperature is the first saturation temperature corresponding to the historical maximum condensing pressure of the refrigerant during the historical start-stop process, and the second saturation temperature corresponding to the frequency-limited condensing pressure. The historical inlet water temperature is the first inlet water temperature of the heat pump unit when it is greater than or equal to the shutdown temperature for the most recent time during the historical start-stop process, and the second inlet water temperature when it is less than the shutdown temperature for the most recent time during the historical start-stop process;

[0135] Determine the water inlet temperature correction coefficient based on the actual ambient temperature of the heat pump unit, the historical maximum exhaust temperature, the first saturation temperature and the second saturation temperature;

[0136] Based on the first inlet water temperature, the second inlet water temperature and the inlet water temperature correction coefficient, a reference inlet water temperature for the heat pump unit to enter a startup state is determined.

[0137] Optionally, the processor 701 is further used to specifically execute: if it is detected that the third water inlet temperature at the water inlet of the heat pump unit is less than or equal to the reference water inlet temperature, then the heat pump unit is controlled to enter a startup state.

[0138] Optionally, the processor 701 determines the water inlet temperature correction coefficient based on the actual ambient temperature, the historical highest exhaust temperature, the first saturation temperature and the second saturation temperature of the heat pump unit, and specifically performs: determining the exhaust temperature correction coefficient based on the actual ambient temperature and the historical highest exhaust temperature; determining the water inlet temperature correction coefficient based on the exhaust temperature correction coefficient, the first saturation temperature and the second saturation temperature.

[0139] Optionally, the processor 701 determines the water inlet temperature correction coefficient based on the exhaust temperature correction coefficient, the first saturation temperature and the second saturation temperature, and specifically performs: subtracting the first saturation temperature from the second saturation temperature to obtain the saturation temperature difference; adding the saturation temperature difference to the exhaust temperature correction coefficient to obtain the water inlet temperature correction coefficient.

[0140] Optionally, when the processor 701 is executing and the heat pump unit is in a shutdown state, the historical saturation temperature, the historical maximum exhaust temperature and the historical inlet water temperature of the heat pump unit during the historical start-stop process are obtained, and the specific execution is: calling the condensing pressure data monitored by the pressure sensor, determining the historical maximum condensing pressure from the condensing pressure data, and determining the first saturation temperature corresponding to the historical maximum condensing pressure; calling the evaporating temperature data monitored by the evaporating temperature sensor, determining the frequency-limiting condensing pressure from the evaporating temperature data, and determining the second saturation temperature corresponding to the frequency-limiting condensing pressure; calling the exhaust temperature data monitored by the exhaust temperature sensor, and determining the historical maximum exhaust temperature from the exhaust temperature data; analyzing the water inlet temperature monitored by the water inlet temperature sensor to determine the historical water inlet temperature.

[0141] Optionally, the processor 701 determines the reference water inlet temperature for the heat pump unit to enter the start-up state based on the first water inlet temperature, the second water inlet temperature and the water inlet temperature correction coefficient. Specifically, the processor 701 subtracts the water inlet temperature correction coefficient from the first water inlet temperature to obtain the corrected water inlet temperature. If the corrected water inlet temperature is less than the second water inlet temperature, the corrected water inlet temperature is determined as the reference water inlet temperature. If the corrected water inlet temperature is greater than the second water inlet temperature, the second water inlet temperature is determined as the reference water inlet temperature.

[0142] Optionally, after determining the reference water inlet temperature for the heat pump unit to enter the start-up state based on the first water inlet temperature, the second water inlet temperature and the water inlet temperature correction coefficient, the processor 701 specifically executes: if the reference water inlet temperature is greater than a preset temperature range, the preset default water inlet temperature is determined as the reference water inlet temperature.

[0143] In an embodiment of the present application, by obtaining the historical saturation temperature, the historical maximum exhaust temperature, and the historical inlet water temperature under different conditions during the historical start and stop process of the heat pump unit, the past operation information of the heat pump unit can be fully utilized. On this basis, the inlet water temperature correction coefficient is determined according to the actual ambient temperature, the historical maximum exhaust temperature, and the historical saturation temperature. Finally, the reference inlet water temperature for the heat pump unit to enter the startup state is determined based on the first inlet water temperature, the second inlet water temperature, and the inlet water temperature correction coefficient. This method of comprehensively considering multiple factors to determine the reference inlet water temperature can improve the accuracy of the inlet water temperature setting when the heat pump unit is started, which helps to optimize the startup process of the heat pump unit and avoid the problem of heat pump unit loss or low operating efficiency due to unreasonable inlet water temperature setting.

[0144] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored. When the computer program is run on a computer, the computer executes the above-mentioned related method steps to implement a water temperature determination method provided in the above-mentioned embodiment.

[0145] In addition, the device provided in the embodiment of the present application can specifically be a chip, component or module, and the chip may include a connected processor and memory; wherein the memory is used to store instructions, and when the processor calls and executes the instructions, the chip can execute a water temperature determination method provided in the above embodiment.

[0146] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement a water temperature determination method provided in the above-mentioned embodiment.

[0147] The embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement a water temperature determination method provided in the above-mentioned embodiment.

[0148] Among them, the device, computer-readable storage medium, computer program product or chip provided in the embodiments of the present application are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above and will not be repeated here.

[0149] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0150] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the coupling or direct coupling or communication connection between the related ones shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0151] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining water temperature, characterized in that: A controller applied to a heat pump unit, the method comprising: If the heat pump unit is in a shutdown state, obtain the historical saturation temperature, historical maximum exhaust temperature and historical inlet water temperature of the heat pump unit during the historical start-stop process, the historical saturation temperature is the first saturation temperature corresponding to the historical maximum condensing pressure of the refrigerant during the historical start-stop process, and the second saturation temperature corresponding to the frequency-limited condensing pressure, the historical inlet water temperature is the first inlet water temperature of the heat pump unit when it is greater than or equal to the shutdown temperature for the most recent time during the historical start-stop process, and the second inlet water temperature when it is less than the shutdown temperature for the most recent time during the historical start-stop process; Determining a water inlet temperature correction coefficient based on the actual ambient temperature of the heat pump unit, the historical maximum exhaust temperature, the first saturation temperature, and the second saturation temperature; Based on the first inlet water temperature, the second inlet water temperature and the inlet water temperature correction coefficient, a reference inlet water temperature for the heat pump unit to enter a startup state is determined.

2. The method according to claim 1, characterized in that Also includes: If it is detected that the third water inlet temperature at the water inlet of the heat pump unit is less than or equal to the reference water inlet temperature, the heat pump unit is controlled to enter the startup state.

3. The method according to claim 1, characterized in that The determining of the water inlet temperature correction coefficient based on the actual ambient temperature of the heat pump unit, the historical maximum exhaust temperature, the first saturation temperature, and the second saturation temperature includes: Determining an exhaust temperature correction coefficient based on the actual ambient temperature and the historical maximum exhaust temperature; The water inlet temperature correction coefficient is determined based on the exhaust temperature correction coefficient, the first saturation temperature, and the second saturation temperature.

4. The method according to claim 3, characterized in that The determining the water inlet temperature correction coefficient based on the exhaust temperature correction coefficient, the first saturation temperature and the second saturation temperature includes: subtracting the first saturation temperature from the second saturation temperature to obtain a saturation temperature difference; The saturation temperature difference is added to the exhaust temperature correction coefficient to obtain the water inlet temperature correction coefficient.

5. The method according to claim 1, characterized in that: The heat pump unit includes a compressor, a first heat exchanger, a second heat exchanger, an exhaust temperature sensor, a pressure sensor, an evaporation temperature sensor, an ambient temperature sensor, a water inlet temperature sensor, and a water outlet temperature sensor; The exhaust temperature sensor is arranged on the gas pipeline of the exhaust port of the compressor, the pressure sensor is arranged on the gas pipeline above the exhaust port, the evaporation temperature sensor is arranged on the gas pipeline in the first heat exchanger, the ambient temperature sensor is arranged in the first heat exchanger, the water inlet temperature sensor is arranged on the water inlet pipeline on the water side of the second heat exchanger, and the water outlet temperature sensor is arranged on the water outlet pipeline on the water side of the second heat exchanger.

6. The method according to claim 5, characterized in that If the heat pump unit is in a shutdown state, the historical saturation temperature, the historical maximum exhaust temperature and the historical water inlet temperature of the heat pump unit during the historical start-stop process are obtained, including: calling the condensing pressure data monitored by the pressure sensor, determining the historical maximum condensing pressure from the condensing pressure data, and determining the first saturation temperature corresponding to the historical maximum condensing pressure; calling the evaporation temperature data monitored by the evaporation temperature sensor, determining the frequency-limiting condensation pressure from the evaporation temperature data, and determining the second saturation temperature corresponding to the frequency-limiting condensation pressure; calling exhaust temperature data monitored by the exhaust temperature sensor, and determining the historical maximum exhaust temperature from the exhaust temperature data; The inlet water temperature monitored by the inlet water temperature sensor is analyzed to determine the historical inlet water temperature.

7. The method according to claim 1, characterized in that The step of determining a reference water inlet temperature for the heat pump unit to enter a startup state based on the first water inlet temperature, the second water inlet temperature, and the water inlet temperature correction coefficient includes: Subtracting the inlet water temperature correction coefficient from the first inlet water temperature to obtain a corrected inlet water temperature; If the corrected water inlet temperature is less than the second water inlet temperature, determining the corrected water inlet temperature as the reference water inlet temperature; If the corrected water inlet temperature is greater than the second water inlet temperature, the second water inlet temperature is determined as the reference water inlet temperature.

8. The method according to claim 7, characterized in that After determining the reference water inlet temperature for the heat pump unit to enter the startup state based on the first water inlet temperature, the second water inlet temperature and the water inlet temperature correction coefficient, the method further includes: If the reference water inlet temperature is greater than a preset temperature range, the preset default water inlet temperature is determined as the reference water inlet temperature.

9. A water temperature determination device, characterized in that: include: A historical temperature acquisition unit, for acquiring, if the heat pump unit is in a shutdown state, a historical saturation temperature, a historical maximum exhaust temperature, and a historical water inlet temperature of the heat pump unit during the historical start-stop process, wherein the historical saturation temperature is a first saturation temperature corresponding to a historical maximum condensing pressure of the refrigerant during the historical start-stop process, and a second saturation temperature corresponding to a frequency-limited condensing pressure; the historical water inlet temperature is a first water inlet temperature of the heat pump unit when it was greater than or equal to the shutdown temperature for the most recent time during the historical start-stop process, and a second water inlet temperature when it was less than the shutdown temperature for the most recent time during the historical start-stop process; a correction coefficient generating unit, configured to determine a water inlet temperature correction coefficient based on an actual ambient temperature of the heat pump unit, the historical maximum exhaust temperature, the first saturation temperature, and the second saturation temperature; A reference temperature calculation unit is used to determine a reference water inlet temperature for the heat pump unit to enter a startup state based on the first water inlet temperature, the second water inlet temperature and the water inlet temperature correction coefficient.

10. A heat pump unit, characterized in that: The heat pump unit comprises a controller, and the controller is used to execute the water temperature determination method according to any one of claims 1 to 8.

11. The heat pump unit according to claim 10, characterized in that: The heat pump unit also includes a compressor, a first heat exchanger, a second heat exchanger, an exhaust temperature sensor, a pressure sensor, an evaporation temperature sensor, an ambient temperature sensor, a water inlet temperature sensor, and a water outlet temperature sensor; The controller is electrically connected to the compressor, the first heat exchanger, the second heat exchanger, the exhaust temperature sensor, the pressure sensor, the evaporation temperature sensor, the ambient temperature sensor, the water inlet temperature sensor and the water outlet temperature sensor respectively; The exhaust temperature sensor is arranged on the gas pipeline of the exhaust port of the compressor, the pressure sensor is arranged on the gas pipeline above the exhaust port, the evaporation temperature sensor is arranged on the gas pipeline in the first heat exchanger, the ambient temperature sensor is arranged in the first heat exchanger, the water inlet temperature sensor is arranged on the water inlet pipeline on the water side of the second heat exchanger, and the water outlet temperature sensor is arranged on the water outlet pipeline on the water side of the second heat exchanger.

12. An electronic device, characterized in that: The electronic device comprises: A memory for storing executable program codes; A processor is used to call and run the executable program code from the memory, so that the electronic device executes the water temperature determination method as described in any one of claims 1 to 8.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the water temperature determination method according to any one of claims 1 to 8 is implemented.

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