Water source heat pump system control method, control device and water source heat pump system

Abstract

The present application belongs to the technical field of heat pump system, and particularly relates to a control method and a control device of a water source heat pump system and the heat pump system. The control method comprises: determining the saturation temperature of refrigerant; determining the preset temperature interval in which the saturation temperature is located; in the case that the saturation temperature is in the first temperature interval, performing first layer regulation and control on the water source heat pump system; in the case that the first layer regulation and control fails, performing second layer regulation and control on the water source heat pump system until the saturation temperature is stabilized in the first temperature interval or the saturation temperature enters the normal operation temperature interval of the water source heat pump system. The present application can avoid the situation that the compressor frequency reduction limit is frequently triggered or even the compressor is stopped due to the continuous increase of unit pressure, ensure the stable operation of the water source heat pump system, and improve the user experience.

Description

Technical Field

[0001] This invention belongs to the field of heat pump system technology, and particularly relates to a control method, control device and water source heat pump system for a water source heat pump system. Background Technology

[0002] In related technologies, the protection mechanism of a water source heat pump system usually involves monitoring the operating pressure of the unit and reducing the compressor frequency or controlling the unit to shut down when the pressure value exceeds the compressor frequency reduction limit or shutdown protection limit. However, when the water source heat pump system is in the transition range between the normal operating pressure range and the compressor frequency reduction limit, the lack of control over the transition range will cause the unit to frequently trigger the frequency reduction limit, resulting in frequent compressor frequency reduction or even shutdown protection, which reduces the user experience. Summary of the Invention

[0003] To overcome the problem of frequent frequency reduction or even shutdown protection of the unit in related technologies, the first aspect of this invention proposes a control method for a water source heat pump system, the control method comprising:

[0004] Determine the saturation temperature of the refrigerant;

[0005] Determine the preset temperature range in which the saturation temperature is located;

[0006] When the saturation temperature is within the first temperature range, the water source heat pump system is subjected to the first level of regulation;

[0007] If the first layer of regulation fails, the water source heat pump system is regulated by the second layer until the saturation temperature stabilizes in the first temperature range, or the saturation temperature enters the normal operating temperature range of the water source heat pump system.

[0008] The first layer of regulation includes: adjusting the water flow rate of the cooling water circuit that is thermally coupled to the water-side heat exchanger; the second layer of regulation includes: adjusting the compressor frequency.

[0009] The minimum value of the first temperature range is greater than the maximum value of the normal operating temperature range.

[0010] In some implementations, the maximum value of the first temperature range is less than the minimum value of the shutdown protection temperature range, and shutdown protection is required when the saturation temperature is within the shutdown protection temperature range.

[0011] In some implementations, the failure of the first layer regulation includes: the saturation temperature tending to rise beyond the first temperature range, or the water flow rate adjustment range being less than the set water flow rate.

[0012] In some implementations, the first layer of regulation is determined to be effective when the saturation temperature approaches the normal temperature range, or when the saturation temperature remains unchanged, or when it can be determined from the trend of the saturation temperature increase that it will not rise beyond the first temperature range.

[0013] In some implementations, if the first layer of regulation is effective, the water flow rate is further adjusted until the water flow rate reaches the target water flow rate.

[0014] In some implementations, when it is necessary to increase the water flow rate, the target water flow rate is the sum of the actual water flow rate and the set water flow rate;

[0015] When it is necessary to reduce the water flow rate, the target water flow rate is the difference between the actual water flow rate and the set water flow rate.

[0016] In some embodiments, when the saturation temperature is in the second temperature range, the compressor operating frequency is adjusted until the saturation temperature enters the first temperature range or enters the normal operating temperature range;

[0017] The minimum value of the second temperature range is greater than the maximum value of the first temperature range, and the maximum value of the second temperature range is less than the minimum value of the shutdown protection temperature range.

[0018] In some embodiments, determining the refrigerant saturation temperature includes:

[0019] Obtain the pressure value between the connecting pipes of the water-side heat exchanger and the compressor;

[0020] The saturation temperature of the refrigerant is determined based on the pressure value.

[0021] In some embodiments, determining the preset temperature range in which the saturation temperature falls includes:

[0022] Determine the operating mode of the water source heat pump system;

[0023] The preset temperature range corresponding to the operating mode is determined according to the preset mapping relationship between the operating mode and the preset temperature range.

[0024] A second aspect of the present invention provides a control device comprising one or more processors and a non-transitory computer-readable storage medium storing program instructions, wherein when the one or more processors execute the program instructions, the one or more processors are used to implement the control method of the water source heat pump system according to any one of the claims in the first aspect of the present invention.

[0025] A third aspect of the present invention provides a water source heat pump system, which operates according to the control method of the water source heat pump system according to any one of the claims of the first aspect of the present invention, or includes the control device proposed in the second aspect of the present invention.

[0026] The technical solution of the present invention can include the following beneficial effects: When the saturation temperature of the water source heat pump system is in the first temperature range between the normal temperature range and the frequency reduction limit, the present invention first performs a first-level regulation to adjust the water flow rate so that the water source heat pump system is stable in the first temperature range or enters the normal operating temperature range. Only when the first-level regulation fails is a second-level regulation to adjust the compressor frequency executed. This can avoid the frequent triggering of the compressor frequency reduction limit or even shutdown protection due to the continuous increase of unit pressure, ensure the stable operation of the water source heat pump system, and improve the user experience.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0029] Figure 1 This is a structural diagram of a water source heat pump system according to an exemplary embodiment.

[0030] Figure 2 This is a control flow diagram of a water source heat pump system according to an exemplary embodiment.

[0031] Figure 3 This is a control flow diagram of a water source heat pump system illustrated with a specific example.

[0032] The components include: 1. Pumping device; 2. Control device; 3. Water-side heat exchanger; 4. Pressure sensor; 5. Indoor heat exchanger; 6. Four-way reversing valve; 7. Compressor; 8. Throttling device; 9. Cooling water circuit; 10. Refrigerant circulation circuit. Detailed Implementation

[0033] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0034] This embodiment proposes a control method for a water source heat pump system, such as... Figure 1 As shown, the system includes a refrigerant circulation path 10 and a water circulation path. The refrigerant circulation path 10 includes a compressor 7, a water-side heat exchanger 3, an indoor heat exchanger 5, and a throttling device 8 connected in sequence. The water-side heat exchanger 3 is, for example, a shell-and-tube heat exchanger, and can be installed indoors or outdoors. For example, the water-side heat exchanger 3 is an outdoor heat exchanger. The throttling device 8 is, for example, an electronic expansion valve. The water circulation path includes a cooling water path 9 thermally coupled to the water-side heat exchanger 3. The cooling water path 9 is equipped with a pumping device 1 and a water flow detection device (not shown in the figure). The water flow detection device is used to detect the water flow rate of the cooling water path 9. The pumping device 1 is, for example, a variable frequency pump, and the water flow rate of the cooling water path 9 can be adjusted by adjusting the frequency of the variable frequency pump. A pressure sensor 4 is also provided between the water-side heat exchanger 3 and the compressor 7. The pressure sensor 4 is used to detect the refrigerant pressure between the water-side heat exchanger 3 and the compressor 7. In one example, the water source heat pump system also includes a four-way reversing valve 6, which has four ports: d, c, s, and e. The compressor 7 exhaust port is connected to port d, the compressor 7 suction port is connected to port s, the water-side heat exchanger 3 is connected to port c, the indoor heat exchanger 5 is connected to port e, and a pressure sensor 4 is located between the water-side heat exchanger 3 and port c. The water source heat pump system also includes a control device 2, which is signal-connected to the pumping device 1, the compressor 7, and the pressure sensor 4. The control device 2 can adjust the compressor 7 frequency and the cooling water flow rate of the cooling water circuit 9 according to the saturation temperature corresponding to the pressure value detected by the pressure sensor 4.

[0035] Figure 2 This is a control flowchart of a water source heat pump system according to an exemplary embodiment. The control method includes the following steps:

[0036] S21. Determine the saturation temperature of the refrigerant.

[0037] In this embodiment, the refrigerant saturation temperature reflects the condensing or evaporating pressure of the heat pump system. A pressure sensor is installed on the connecting pipe between the compressor 7 and the water-side heat exchanger 3. When the water source heat pump system is in heating mode, the pressure value detected by the pressure sensor is the evaporating pressure of the unit; when the water source heat pump system is in cooling mode, the pressure value detected by the pressure sensor is the condensing pressure of the unit. In one example, the pressure value between the connecting pipe of the water-side heat exchanger 3 and the compressor 7 is obtained, and the refrigerant saturation temperature is determined based on the pressure value. Specifically, the pressure sensor converts the detected pressure signal into a corresponding voltage value, and the control device 2 of the water source heat pump system converts the voltage value into a corresponding saturation temperature. For example, the saturation temperature corresponding to the voltage value is determined according to a preset correspondence between the voltage value and the saturation temperature.

[0038] S22. Determine the preset temperature range where the saturation temperature is located.

[0039] In this embodiment, the preset temperature range is a temperature range of saturation temperature pre-stored in the control device 2, and the preset temperature range is related to the operating mode of the water source heat pump system. Specifically, the control device 2 pre-stores a preset mapping relationship between operating mode and preset temperature range. For example, when the water source heat pump system is in cooling mode, the preset temperature range includes ranges C1, C2, C3, or C4, where the temperature range of range C1 is (t c1 ,t c2 The temperature range of interval C2 is [t] c2 ,t c3 The temperature range of C3 is [t] c3 ,t c4 The temperature range of C4 is [t] c4 ,t c5 When the water source heat pump system is in heating mode, the preset temperature range includes H1, H2, H3, or H4, where the temperature range of the H1 range is (t H1 ,t H2 The temperature range of H2 is [t] c2 ,t c3 The temperature range of the H3 interval is [t] c3 ,t c4 The temperature range of interval H4 is [t] c4 ,t c5 When determining the preset temperature range where the saturation temperature falls, it is necessary to first determine the operating mode of the water source heat pump system, and then determine the preset temperature range corresponding to the operating mode based on the preset mapping relationship between the operating mode and the preset temperature range. Simultaneously, different preset temperature ranges correspond to different control strategies for the water source heat pump system. For example, the controller stores a preset mapping relationship between preset temperature ranges and control strategies. After determining the refrigerant's saturation temperature, the preset temperature range where the saturation temperature falls is determined based on the preset mapping relationship, and then the operation of the water source heat pump system is controlled according to the control strategy corresponding to the determined preset temperature range.

[0040] S23. When the saturation temperature is in the first temperature range, perform the first level of regulation on the water source heat pump system.

[0041] In this embodiment, the minimum value of the first temperature range is greater than the maximum value of the normal operating temperature range, and the maximum value of the first temperature range can be further limited to be less than the minimum value of the shutdown protection temperature range. That is, the first temperature range is a transition range between the normal operating temperature range and the shutdown protection temperature range. In cooling mode, the normal operating temperature range is, for example, range C1, the first temperature range is, for example, range C2, and the shutdown protection temperature range is, for example, range C4. In heating mode, the normal operating temperature range is, for example, range H1, the first temperature range is, for example, range H2, and the shutdown protection temperature range is, for example, range H4. When the saturation temperature is in the first temperature range, if the unit is not regulated, the refrigerant saturation temperature will continue to rise until it reaches the compressor 7 frequency reduction limit or even the shutdown protection temperature range. When the saturation temperature reaches the shutdown protection temperature range, shutdown protection is required. At this time, the compressor 7 is shut down, and the entire water source heat pump system shuts down for protection. This can lead to frequent frequency reduction of the compressor 7 or even frequent shutdown protection of the unit, affecting the user experience. Therefore, when the unit is in the transition range, the water source heat pump system is regulated to prevent the saturation temperature from rising continuously. In this embodiment, when the unit is in the first temperature range, the water source heat pump system undergoes a first-level regulation. This first-level regulation includes adjusting the water flow rate of the cooling water path 9, which is thermally coupled to the water-side heat exchanger 3. In a specific example, the cooling water path 9 is equipped with a variable frequency water pump, and the water flow rate is adjusted by regulating the flow rate of the variable frequency water pump. When the water flow rate increases, more cooling water is used for heat exchange with the water-side heat exchanger 3, resulting in a decrease in the refrigerant saturation temperature. Conversely, when the water flow rate decreases, less cooling water is used for heat exchange with the water-side heat exchanger 3, resulting in an increase in the refrigerant saturation temperature. For example, when the unit is in the first temperature range, the refrigerant saturation temperature can be reduced by increasing the water flow rate of the cooling water path 9.

[0042] S24. If the first-level regulation fails, the water source heat pump system shall be regulated to the second level until the saturation temperature stabilizes in the first temperature range or the saturation temperature enters the normal operating temperature range of the water source heat pump system.

[0043] In this embodiment, during the first-level regulation of the water source heat pump system, the effectiveness of the first-level regulation is also detected. If the first-level regulation is effective, the water flow rate is adjusted further. If the first-level regulation fails, it indicates that adjusting the water flow rate cannot reduce the refrigerant saturation temperature. In this case, a second-level regulation of the water source heat pump system is required. The second-level regulation includes adjusting the frequency of compressor 7. Increasing the frequency of compressor 7 will raise the refrigerant saturation temperature, and decreasing the frequency of compressor 7 will lower the refrigerant saturation temperature. For example, if the first-level regulation fails, the refrigerant saturation temperature can be lowered by reducing the operating frequency of compressor 7.

[0044] In some embodiments, the failure of the first-level control includes: the saturation temperature is trending upward beyond the first temperature range. For example, after increasing the water flow rate to the maximum allowable flow rate, the saturation temperature continues to rise. At this time, adjusting the water flow rate cannot change the upward trend of the saturation temperature. Under this upward trend, the saturation temperature will inevitably reach the temperature range of the frequency reduction limit or shutdown protection. This indicates that the first-level control has failed.

[0045] Alternatively, when the water flow rate adjustment range is less than the set water flow rate, the adjustment range is insufficient to lower the saturation temperature, and adjusting the water flow rate has no effect on the unit's status. This situation also indicates that the first-level control has failed. Specifically, the water flow rate range of the water source heat pump system is [f min ,f max The actual water flow rate in cooling water circuit 9 was detected to be f0. When the water flow rate needs to be increased, it is determined that Δf1 = |f0 - f max |, when △f1 < △f 01 At that time, it was believed that the water pump adjustment range was small and that adjusting the water flow would have no impact on the unit's status. 01 This is the set water flow rate corresponding to the increase in water flow rate; when the water flow rate needs to be reduced, it is determined that Δf2 = |f0 - f min |, when △f1 < △f 02 At that time, it was believed that the water pump adjustment range was small and that adjusting the flow rate would have no impact on the unit's status. 01 This is the set water flow rate corresponding to a decrease in water flow.

[0046] In some embodiments, when the saturation temperature approaches the normal temperature range, or remains unchanged, or when the upward trend of the saturation temperature indicates it will not rise beyond the first temperature range, it means that adjusting the water flow rate prevents the refrigerant saturation temperature from rising further, and the refrigerant saturation temperature will not temporarily reach the frequency reduction limit or shutdown protection temperature range. This confirms that the first-level control is effective. At this point, the unit can maintain its current state and continue stable operation to ensure the user's cooling and heating needs. If the first-level control is effective, the water flow rate continues to be adjusted until the target water flow rate is reached. When an increase in water flow rate is required, the target water flow rate is the sum of the actual water flow rate and the set water flow rate; when a decrease in water flow rate is required, the target water flow rate is the difference between the actual water flow rate and the set water flow rate.

[0047] In some implementations, when the saturation temperature is in the second temperature range, the operating frequency of compressor 7 is adjusted until the saturation temperature enters the first temperature range or the normal operating temperature range. The minimum value of the second temperature range is greater than the maximum value of the first temperature range, and the maximum value of the second temperature range is less than the minimum value of the shutdown protection temperature range. The second temperature range is the temperature range for adjusting the frequency of compressor 7. For example, in heating mode, the second temperature range is range H3, and in cooling mode, the second temperature range is range C3. When the saturation temperature is in the second temperature range, the saturation temperature is relatively high, and adjusting the water flow rate cannot change the upward trend of the saturation temperature. At this time, it is necessary to adjust the frequency of compressor 7 to reduce the saturation temperature, for example, by reducing the frequency of compressor 7, until the saturation temperature enters the first temperature range or the normal operating temperature range. Once the saturation temperature enters the first temperature range, the unit will continue to operate according to the control logic for the saturation temperature being in the first temperature range.

[0048] The control method of this embodiment will be described in detail below with specific examples. The control method includes the following steps:

[0049] S31, The water source heat pump system is started and running, enter S31;

[0050] S32. Obtain the pressure value between the connecting pipes of the water-side heat exchanger 3 and the compressor 7, and determine the refrigerant saturation temperature based on the pressure value;

[0051] S33. Determine the preset temperature range of the saturation temperature. When the saturation temperature is in the normal operating temperature range, proceed to S34; when the saturation temperature is in the first temperature range, proceed to S35; when the saturation temperature is in the second temperature range, proceed to S36; when the saturation temperature is in the shutdown protection temperature range, proceed to S37.

[0052] S34. The unit is operating normally.

[0053] S35. Perform the first level of regulation, increase the water flow rate of the cooling water circuit 9 which is thermally coupled to the water-side heat exchanger 3, and enter S38.

[0054] S36. Reduce compressor frequency;

[0055] S37, Control unit shutdown protection;

[0056] S38. Determine whether the first-level regulation is effective. If the result is yes, return to S33. If the result is no, proceed to S39.

[0057] S39. Enter the second level of control and reduce the frequency of compressor 7.

[0058] According to an exemplary embodiment, this embodiment proposes a control device including one or more processors and a non-transitory computer-readable storage medium storing program instructions. When the one or more processors execute the program instructions, the one or more processors are used to implement the control method of the water source heat pump system of any of the above embodiments.

[0059] According to an exemplary embodiment, this embodiment proposes a water source heat pump system, which operates according to the control method of the water source heat pump system in any of the above embodiments, or includes the control device proposed in the above embodiments.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0063] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0064] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0065] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware, and the program can be stored in a computer-readable storage medium. When executed, the program includes one or a combination of the steps of the method embodiments.

[0066] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0067] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A control method for a water source heat pump system, characterized in that, The control method includes: Determine the saturation temperature of the refrigerant; Determine the preset temperature range in which the saturation temperature is located; When the saturation temperature is within the first temperature range, the water source heat pump system is subjected to the first level of regulation; If the first layer of regulation fails, the water source heat pump system is regulated by the second layer until the saturation temperature stabilizes in the first temperature range, or the saturation temperature enters the normal operating temperature range of the water source heat pump system. The first layer of regulation includes: adjusting the water flow rate of the cooling water circuit thermally coupled to the water-side heat exchanger; the second layer of regulation includes: reducing the compressor frequency; the failure of the first layer of regulation includes: the saturation temperature is trending upward to exceed the first temperature range, or the adjustment range of the water flow rate is less than the set water flow rate; the minimum value of the first temperature range is greater than the maximum value of the normal operating temperature range.

2. The control method for a water source heat pump system according to claim 1, characterized in that, The maximum value of the first temperature range is less than the minimum value of the shutdown protection temperature range. When the saturation temperature is within the shutdown protection temperature range, shutdown protection is required.

3. The control method for a water source heat pump system according to claim 1, characterized in that, The first layer of regulation is determined to be effective when the saturation temperature approaches the normal operating temperature range, or the saturation temperature remains unchanged, or the trend of the saturation temperature increase indicates that it will not rise beyond the first temperature range.

4. The control method for a water source heat pump system according to claim 3, characterized in that, If the first layer of regulation is effective, the water flow rate continues to be adjusted until the water flow rate reaches the target water flow rate.

5. The control method for a water source heat pump system according to claim 4, characterized in that, When it is necessary to increase the water flow rate, the target water flow rate is the sum of the actual water flow rate and the set water flow rate; When it is necessary to reduce the water flow rate, the target water flow rate is the difference between the actual water flow rate and the set water flow rate.

6. The control method for a water source heat pump system according to claim 2, characterized in that, When the saturation temperature is in the second temperature range, reduce the compressor operating frequency until the saturation temperature enters the first temperature range or the normal operating temperature range. The minimum value of the second temperature range is greater than the maximum value of the first temperature range, and the maximum value of the second temperature range is less than the minimum value of the shutdown protection temperature range.

7. The control method for a water source heat pump system according to claim 1, characterized in that, Determining the saturation temperature of the refrigerant includes: Obtain the pressure value between the connecting pipes of the water-side heat exchanger and the compressor; The saturation temperature of the refrigerant is determined based on the pressure value.

8. The control method for a water source heat pump system according to claim 1, characterized in that, Determining the preset temperature range within which the saturation temperature falls includes: Determine the operating mode of the water source heat pump system; The preset temperature range corresponding to the operating mode is determined according to the preset mapping relationship between the operating mode and the preset temperature range.

9. A control device, characterized in that, It includes one or more processors and a non-transitory computer-readable storage medium storing program instructions, wherein when the one or more processors execute the program instructions, the one or more processors are used to implement the control method of the water source heat pump system according to any one of claims 1-8.

10. A water source heat pump system, characterized in that, The water source heat pump system operates according to the control method described in any one of claims 1-8, or includes the control device described in claim 9.

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