Heat pump system, control method and device thereof and computer readable storage medium

Abstract

The embodiment of the invention provides a heat pump system and a control method and device thereof and a computer readable storage medium, the heat pump system comprises a plurality of fixed-frequency heat pump modules and a water side heat exchanger, each fixed-frequency heat pump module comprises a fixed-frequency compressor, an air side heat exchanger and an outdoor fan, and the outdoor fan and the air side heat exchanger are correspondingly arranged; the water side heat exchanger is provided with a secondary refrigerant flow channel and a plurality of refrigerant flow channels, the secondary refrigerant flow channel and the refrigerant flow channels are arranged at intervals, any two refrigerant flow channels are arranged at intervals, and each refrigerant flow channel is connected with one fixed-frequency heat pump module; the heat pump system control method comprises the steps that the absolute value of the temperature difference between the water inlet temperature and the water outlet temperature of the secondary refrigerant flow channel is determined; and according to the absolute value of the temperature difference between the water inlet temperature and the water outlet temperature of the secondary refrigerant flow channel, the number of the started fixed-frequency compressors and the number of the started outdoor fans are adjusted.

Description

Technical Field

[0001] The present application relates to the field of heat pump technology, and in particular to a heat pump system and a control method, device, and computer-readable storage medium thereof. Background Art

[0002] The heat pump system can use the refrigerant side to provide cooling to the coolant side, and then use the coolant to circulate the absorbed cooling to the room to meet the indoor heating needs, or release the coolant to provide hot and cold water. In the related art, some heat pump systems use low-cost fixed-frequency module machines. However, fixed-frequency module machines cannot adjust the operating frequency according to the actual cooling demand, and the energy-saving effect is poor. Summary of the invention

[0003] The embodiments of the present application provide a heat pump system and its control method, device, and computer-readable storage medium, which can adjust the operating state of the heat pump system according to the actual cooling demand, so that the actual cooling / heating capacity of the heat pump system matches the actual cooling demand, thereby achieving better energy-saving effects.

[0004] In a first aspect, an embodiment of the present application provides a heat pump system control method, wherein the heat pump system includes multiple fixed-frequency heat pump modules and a water-side heat exchanger, wherein the fixed-frequency heat pump module includes a fixed-frequency compressor, an air-side heat exchanger and an outdoor fan, and the outdoor fan and the air-side heat exchanger are arranged correspondingly; the water-side heat exchanger is provided with a coolant flow channel and multiple refrigerant flow channels, and the coolant flow channel and the refrigerant flow channel and any two of the refrigerant flow channels are arranged at intervals, and each of the refrigerant flow channels is connected to a fixed-frequency heat pump module, and the heat pump system control method includes: determining the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the coolant flow channel; and adjusting the number of fixed-frequency compressors and outdoor fans that are turned on according to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the coolant flow channel.

[0005] In some embodiments, the number of fixed-frequency compressors and outdoor fans that are turned on is adjusted according to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel, including: determining the temperature difference range in which the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is located; and adjusting the number of fixed-frequency compressors and outdoor fans that are turned on according to the temperature difference range.

[0006] In some embodiments, the heat pump system includes two fixed-frequency heat pump modules; according to the temperature difference interval, the number of fixed-frequency compressors and outdoor fans turned on is adjusted, including: in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the first temperature difference interval, controlling the fixed-frequency compressors and outdoor fans of the two fixed-frequency heat pump modules to remain turned on; in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the second temperature difference interval, turning off the outdoor fan of one of the fixed-frequency heat pump modules; in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the second temperature difference interval. The value is within the third temperature difference range, shutting down the fixed-frequency compressor of one of the fixed-frequency heat pump modules; in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the fourth temperature difference range, shutting down the fixed-frequency compressor and the outdoor fan of one of the fixed-frequency heat pump modules; the first temperature difference range is a temperature difference range that is less than or equal to the first temperature difference threshold, the second temperature difference range is a temperature difference range that is greater than the first temperature difference threshold and less than or equal to the second temperature difference threshold, the third temperature difference range is a temperature difference range that is greater than the second temperature difference threshold and less than or equal to the third temperature difference threshold, and the fourth temperature difference range is a temperature difference range that is greater than the third temperature difference threshold.

[0007] In some embodiments, the heat pump system includes two fixed-frequency heat pump modules; according to the temperature difference interval, the number of turned-on fixed-frequency compressors and outdoor fans is adjusted, including: in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the fifth temperature difference interval, controlling the fixed-frequency compressors and outdoor fans of the two fixed-frequency heat pump modules to remain in the turned-on state; in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the sixth temperature difference interval, turning off the outdoor fan of one of the fixed-frequency heat pump modules; in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the seventh temperature difference interval, turning off the fixed-frequency compressor of one of the fixed-frequency heat pump modules; in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the seventh temperature difference interval, The absolute value of the temperature difference is within the eighth temperature difference interval, and the fixed-frequency compressor of one of the fixed-frequency heat pump modules and the outdoor fan of the other fixed-frequency heat pump module are turned off; in response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the ninth temperature difference interval, the fixed-frequency compressor and the outdoor fan of one of the fixed-frequency heat pump modules are turned off; the fifth temperature difference interval is a temperature difference interval less than or equal to the fifth temperature difference threshold, the sixth temperature difference interval is a temperature difference interval greater than the fifth temperature difference threshold and less than or equal to the sixth temperature difference threshold, the seventh temperature difference interval is a temperature difference interval greater than the sixth temperature difference threshold and less than or equal to the seventh temperature difference threshold, the eighth temperature difference interval is a temperature difference interval greater than the seventh temperature difference threshold and less than or equal to the eighth temperature difference threshold, and the ninth temperature difference interval is a temperature difference interval greater than the eighth temperature difference threshold.

[0008] In some embodiments, the fixed-frequency heat pump module also includes a gas-liquid separator, a high-pressure switch and a low-pressure switch, the gas-liquid separator connecting the refrigerant flow channel of the water-side heat exchanger and the suction port of the compressor, the low-pressure switch is arranged on the connecting pipeline between the gas-liquid separator and the suction port, and the high-pressure switch is connected to the exhaust port of the compressor; the heat pump system control method includes: in response to the exhaust pressure of the gas-liquid separator being less than a first pressure threshold, the low-pressure switch is turned off; in response to the exhaust pressure of the gas-liquid separator being greater than or equal to the first pressure threshold, the low-pressure switch is turned on; in response to the exhaust pressure of the compressor being greater than a second pressure threshold, the high-pressure switch is turned off; in response to the exhaust pressure of the compressor being less than or equal to the second pressure threshold, the high-pressure switch is turned on; the first pressure threshold is less than the second pressure threshold.

[0009] In a second aspect, an embodiment of the present application provides a heat pump system control device, comprising: a temperature difference calculation module, configured to determine the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel; a switch control module, configured to adjust the number of fixed-frequency compressors and outdoor fans that are turned on according to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel.

[0010] In a third aspect, an embodiment of the present application provides a heat pump system, comprising: a plurality of fixed-frequency heat pump modules, including a fixed-frequency compressor, an air-side heat exchanger and an outdoor fan, wherein the outdoor fan and the air-side heat exchanger are arranged correspondingly; a water-side heat exchanger, provided with a coolant flow channel and a plurality of refrigerant flow channels, wherein the coolant flow channel and the refrigerant flow channel and any two of the refrigerant flow channels are arranged at intervals, and each of the refrigerant flow channels is connected to a fixed-frequency heat pump module; a memory storing a computer program; and a processor, wherein when the computer program is executed by the processor, the heat pump system control method as described in any of the above embodiments is implemented.

[0011] In some embodiments, the constant-frequency heat pump module further includes a reversing valve, and the reversing valve is respectively connected to the constant-frequency compressor, the air-side heat exchanger, and the refrigerant flow channel.

[0012] In some embodiments, the fixed-frequency heat pump module also includes a gas-liquid separator, a high-pressure switch and a low-pressure switch, the gas-liquid separator connecting the refrigerant flow channel of the water-side heat exchanger and the air intake port of the compressor, the low-pressure switch is arranged on the connecting pipeline between the gas-liquid separator and the air intake port, and the high-pressure switch is arranged on the connecting pipeline between the exhaust port of the compressor and the reversing valve.

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is loaded by a processor to execute the steps in the heat pump system control method described above.

[0014] The heat pump system control method provided in the embodiment of the present application determines the degree of matching between the actual cooling / heating capacity and the actual cooling demand of the heat pump system according to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel, and then adjusts the number of fixed-frequency compressors and outdoor fans turned on according to the matching degree, so that the actual cooling / heating capacity and the actual cooling demand of the heat pump system are matched, thereby reducing the operating power consumption of the heat pump system and improving the operating energy efficiency of the heat pump system, and achieving better energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments 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 creative work.

[0016] Figure 1 is a flow chart of a heat pump system control method provided by some embodiments of the present application;

[0017] Figure 2 is a partial flow chart of a heat pump system control method provided in some embodiments of the present application;

[0018] Figure 3 is another partial flow chart of the heat pump system control method provided by some embodiments of the present application;

[0019] Figure 4 is another partial flow chart of a heat pump system control method provided in some embodiments of the present application;

[0020] Figure 5 is another partial flow chart of the heat pump system control method provided in some embodiments of the present application;

[0021] Figure 6 It is a structural diagram of a heat pump system provided in some embodiments of the present application.

[0022] Description of main component symbols:

[0023] 1-heat pump system, 10-fixed frequency heat pump module, 11-fixed frequency compressor, 12-air side heat exchanger, 13-outdoor fan, 14-reversing valve, 15-gas-liquid separator, 16-high pressure switch, 17-low pressure switch, 20-water side heat exchanger. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 this application.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0027] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0028] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0029] like Figure 1 As shown, in the first aspect, an embodiment of the present application provides a heat pump system control method, which includes S10~S20, and can adjust the operating state of the heat pump system 1 according to the actual cooling demand, so that the actual cooling / heating amount of the heat pump system 1 matches the actual cooling demand, thereby achieving better energy-saving effect.

[0030] like Figure 6 As shown, the heat pump system 1 includes a plurality of fixed-frequency heat pump modules 10 and a water-side heat exchanger 20. The fixed-frequency heat pump module 10 includes a fixed-frequency compressor 11, a wind-side heat exchanger 12 and an outdoor fan 13, and the outdoor fan 13 and the wind-side heat exchanger 12 are arranged correspondingly. The water-side heat exchanger 20 is provided with a refrigerant flow channel and a plurality of refrigerant flow channels, and the refrigerant flow channel and the refrigerant flow channel are arranged at intervals, and each refrigerant flow channel is connected to a fixed-frequency heat pump module 10, so that each refrigerant flow channel is connected to a fixed-frequency compressor 11 in a fixed-frequency heat pump module 10 and the wind-side heat exchanger 12 to form a refrigerant circulation loop. Refrigerant circulates in the refrigerant circulation loop, and the refrigerant can flow through the refrigerant flow channel; at the water-side heat exchanger 20, the refrigerant in the refrigerant flow channel and the refrigerant in the refrigerant flow channel can exchange heat, so that the coldness of the refrigerant circulation loop is transferred to the refrigerant.

[0031] S10: Determine the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the coolant flow channel.

[0032] Here, the brine flow channel has a water inlet end and a water outlet end disposed on the surface of the water-side heat exchanger 20. The water inlet temperature and the water outlet temperature of the brine flow channel can be measured by temperature sensors disposed at the water inlet end and the water outlet end, respectively. After obtaining the water inlet temperature and the water outlet temperature of the brine flow channel, the temperature difference between the water inlet temperature and the water outlet temperature of the brine flow channel and the absolute value of the temperature difference can be determined, thereby obtaining the absolute value of the temperature difference between the water inlet temperature and the water outlet temperature of the brine flow channel.

[0033] S20: According to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel, the number of the fixed-frequency compressors 11 and the outdoor fans 13 to be turned on is adjusted.

[0034] According to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel, the degree of matching between the actual cooling / heating capacity of the heat pump system 1 and the actual cooling demand can be determined. For example, when the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is large, it means that the actual cooling / heating capacity of the heat pump system 1 is large, so that it may be greater than the actual cooling demand, the energy saving effect of the heat pump system 1 is poor, and there may be energy waste, and it is necessary to reduce the number of fixed-frequency compressors 11 and / or outdoor fans 13 that are turned on; when the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is small, it means that the actual cooling / heating capacity of the heat pump system 1 is small, so that it may be less than the actual cooling demand, the actual cooling / heating capacity of the heat pump system 1 cannot meet the actual cooling demand, and it is necessary to increase the number of fixed-frequency compressors 11 and outdoor fans 13 that are turned on.

[0035] Furthermore, the number of the fixed-frequency compressors 11 and the outdoor fans 13 that are turned on can be adjusted according to the matching degree; for example, when the number of the fixed-frequency compressors 11 and the outdoor fans 13 that need to be turned on is less than the number of the fixed-frequency compressors 11 and the outdoor fans 13 that are actually turned on, the fixed-frequency compressors 11 and / or the outdoor fans 13 that are lacking can be controlled to be turned on; when the number of the fixed-frequency compressors 11 and the outdoor fans 13 that need to be turned on is greater than the number of the fixed-frequency compressors 11 and the outdoor fans 13 that are actually turned on, the fixed-frequency compressors 11 and / or the outdoor fans 13 that exceed the required number can be turned off; when the number of the fixed-frequency compressors 11 and the outdoor fans 13 that need to be turned on is equal to the number of the fixed-frequency compressors 11 and the outdoor fans 13 that are actually turned on, the fixed-frequency compressors 11 and the outdoor fans 13 can be not turned on and off. In this way, the actual cooling / heating amount of the heat pump system 1 can be matched with the actual cooling demand, thereby reducing the operating power consumption of the heat pump system 1 and improving the operating energy efficiency of the heat pump system 1, and achieving a better energy-saving effect.

[0036] like Figure 2 As shown, in some embodiments, S20 may include S21-S22.

[0037] S21: Determine a temperature difference range in which the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the coolant flow channel lies.

[0038] Here, several continuously distributed temperature difference intervals can be pre-set in the controller of the heat pump system 1, and a corresponding startup quantity adjustment strategy can be set for each temperature difference interval. The number of temperature difference intervals and the length of each temperature difference interval can be determined according to actual needs, and the embodiment of the present application does not limit this; generally speaking, if the number of temperature difference intervals is large, the number of startup quantity adjustment strategies set is large, the matching degree of each startup quantity adjustment strategy and the temperature difference interval is high, and the classification accuracy of the startup quantity adjustment strategy is high; similarly, if the length of each temperature difference interval is short, the temperature range corresponding to each startup quantity adjustment strategy is small, the matching degree of each startup quantity adjustment strategy and the temperature difference interval is high, and the classification accuracy of the startup quantity adjustment strategy is high. Among them, the startup quantity adjustment strategy can include the number of fixed-frequency compressors 11 and the number of outdoor fans 13 that need to be turned on.

[0039] S22: According to the temperature difference range, the number of the fixed-frequency compressors 11 and the outdoor fans 13 to be turned on is adjusted.

[0040] After determining the temperature difference range in which the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel lies, the startup quantity adjustment strategy corresponding to the temperature difference range can be determined, and then the number of fixed-frequency compressors 11 and outdoor fans 13 required to be turned on can be determined, and corresponding adjustment actions can be made.

[0041] In some examples, the heat pump system 1 may include two fixed-frequency heat pump modules 10. Figure 3 As shown, S22 may include S221 to S224. Here, four continuously distributed temperature difference intervals may be pre-set in the controller of the heat pump system 1, namely, a first temperature difference interval, a second temperature difference interval, a third temperature difference interval, and a fourth temperature difference interval. The first temperature difference interval is a temperature difference interval less than or equal to the first temperature difference threshold, the second temperature difference interval is a temperature difference interval greater than the first temperature difference threshold and less than or equal to the second temperature difference threshold, the third temperature difference interval is a temperature difference interval greater than the second temperature difference threshold and less than or equal to the third temperature difference threshold, and the fourth temperature difference interval is a temperature difference interval greater than the third temperature difference threshold.

[0042] S221: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the first temperature difference range, the fixed-frequency compressors 11 and the outdoor fans 13 of the two fixed-frequency heat pump modules 10 are controlled to remain in an on state.

[0043] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the first temperature difference range, that is, the absolute value of the temperature difference is less than or equal to the first temperature difference threshold, it indicates that the actual cooling demand is high, and the fixed-frequency compressor 11 and the outdoor fan 13 of the two fixed-frequency heat pump modules 10 can be controlled to remain in the on state, so that the actual cooling / heating capacity of the heat pump system 1 is more matched with the actual cooling demand.

[0044] S222: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the second temperature difference range, turning off the outdoor fan 13 of one of the fixed-frequency heat pump modules 10.

[0045] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the second temperature difference interval, that is, the absolute value of the temperature difference is greater than the first temperature difference threshold and less than or equal to the second temperature difference threshold, it indicates that the actual cooling / heating capacity of the heat pump system 1 is higher than the actual cooling demand, and the degree of excess is small. At this time, the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 can be controlled to remain on, while the fixed-frequency compressor 11 of the other fixed-frequency heat pump module 10 can be controlled to remain on and the outdoor fan 13 can be turned off. By controlling the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 to be turned off, the number of outdoor fans 13 that remain on can be reduced, so that the actual cooling / heating capacity of the heat pump system 1 is slightly reduced to near the actual cooling demand, and the operating power consumption of the heat pump system 1 is reduced to a certain extent, achieving a better energy-saving effect.

[0046] S223: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the third temperature difference interval, shutting down the fixed-frequency compressor 11 of one of the fixed-frequency heat pump modules 10 .

[0047] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the third temperature difference interval, that is, the absolute value of the temperature difference is greater than the second temperature difference threshold and less than or equal to the third temperature difference threshold, it indicates that the actual cooling / heating capacity of the heat pump system 1 is higher than the actual cooling demand, and the degree of excess is moderate. At this time, the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 can be controlled to remain turned on, while the outdoor fan 13 of the other fixed-frequency heat pump module 10 can be controlled to remain turned on, but the fixed-frequency compressor 11 is turned off. By controlling the fixed-frequency compressor 11 of one of the fixed-frequency heat pump modules 10 to be turned off, the number of outdoor compressors that remain turned on can be reduced, so that the actual cooling / heating capacity of the heat pump system 1 is moderately reduced to near the actual cooling demand, and the operating power consumption of the heat pump system 1 is moderately reduced, achieving a better energy-saving effect.

[0048] S224: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the fourth temperature difference interval, shut down the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 .

[0049] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the fourth temperature difference interval, that is, the absolute value of the temperature difference is greater than the third temperature difference threshold, it means that the actual cooling / heating capacity of the heat pump system 1 is higher than the actual cooling demand, and the degree of excess is greater. At this time, the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 can be controlled to remain on, while the fixed-frequency compressor 11 and the outdoor fan 13 of the other fixed-frequency heat pump module 10 can be turned off. By controlling the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 to remain off, the number of outdoor compressors that remain on can be reduced, so that the actual cooling / heating capacity of the heat pump system 1 is more significantly reduced to near the actual cooling demand, and the operating power consumption of the heat pump system 1 is reduced to a greater extent, achieving a better energy-saving effect.

[0050] In other examples, the heat pump system 1 may include two fixed-frequency heat pump modules 10. Figure 4 As shown, S22 may include S225 to S229. Here, the fifth temperature difference interval is a temperature difference interval less than or equal to the fifth temperature difference threshold, the sixth temperature difference interval is a temperature difference interval greater than the fifth temperature difference threshold and less than or equal to the sixth temperature difference threshold, the seventh temperature difference interval is a temperature difference interval greater than the sixth temperature difference threshold and less than or equal to the seventh temperature difference threshold, the eighth temperature difference interval is a temperature difference interval greater than the seventh temperature difference threshold and less than or equal to the eighth temperature difference threshold, and the ninth temperature difference interval is a temperature difference interval greater than the eighth temperature difference threshold.

[0051] S225: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the fifth temperature difference interval, the fixed-frequency compressors 11 and the outdoor fans 13 of the two fixed-frequency heat pump modules 10 are controlled to remain in an on state.

[0052] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the fifth temperature difference interval, that is, the absolute value of the temperature difference is less than or equal to the fifth temperature difference threshold, it indicates that the actual cooling demand is high, and the fixed-frequency compressor 11 and the outdoor fan 13 of the two fixed-frequency heat pump modules 10 can be controlled to remain in the on state, so that the actual cooling / heating capacity of the heat pump system 1 is more matched with the actual cooling demand.

[0053] S226: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the sixth temperature difference interval, turning off the outdoor fan 13 of one of the fixed-frequency heat pump modules 10.

[0054] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the sixth temperature difference interval, that is, the absolute value of the temperature difference is greater than the fifth temperature difference threshold and less than or equal to the sixth temperature difference threshold, it indicates that the actual cooling / heating capacity of the heat pump system 1 is higher than the actual cooling demand, and the degree of excess is small. At this time, the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 can be controlled to remain turned on, while the fixed-frequency compressor 11 of the other fixed-frequency heat pump module 10 can be controlled to remain turned on and the outdoor fan 13 can be turned off. By controlling the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 to be turned off, the number of outdoor fans 13 that remain turned on can be reduced, so that the actual cooling / heating capacity of the heat pump system 1 is slightly reduced to near the actual cooling demand, and the operating power consumption of the heat pump system 1 is reduced to a certain extent, achieving a better energy-saving effect.

[0055] S227: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the seventh temperature difference interval, shutting down the fixed-frequency compressor 11 of one of the fixed-frequency heat pump modules 10 .

[0056] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the seventh temperature difference interval, that is, the absolute value of the temperature difference is greater than the sixth temperature difference threshold and less than or equal to the seventh temperature difference threshold, it indicates that the actual cooling / heating capacity of the heat pump system 1 is higher than the actual cooling demand, and the degree of excess is moderate. At this time, the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 can be controlled to remain turned on, while the outdoor fan 13 of the other fixed-frequency heat pump module 10 can be controlled to remain turned on, but the fixed-frequency compressor 11 is turned off. By controlling the fixed-frequency compressor 11 of one of the fixed-frequency heat pump modules 10 to be turned off, the number of outdoor compressors that remain turned on can be reduced, so that the actual cooling / heating capacity of the heat pump system 1 is moderately reduced to near the actual cooling demand, and the operating power consumption of the heat pump system 1 is moderately reduced, achieving a better energy-saving effect.

[0057] S228: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the eighth temperature difference interval, shut down the fixed-frequency compressor 11 of one fixed-frequency heat pump module 10 and the outdoor fan 13 of the other fixed-frequency heat pump module 10.

[0058] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the eighth temperature difference interval, that is, the absolute value of the temperature difference is greater than the seventh temperature difference threshold and less than or equal to the eighth temperature difference threshold, it indicates that the actual cooling / heating capacity of the heat pump system 1 is higher than the actual cooling demand, and the degree of excess is large. At this time, the fixed-frequency compressor 11 of one of the fixed-frequency heat pump modules 10 can be controlled to be turned off, but the outdoor fan 13 can be kept on, while the outdoor fan 13 of another fixed-frequency heat pump module 10 can be controlled to be kept on, but the fixed-frequency compressor 11 is turned off. By controlling the fixed-frequency compressor 11 of one of the fixed-frequency heat pump modules 10 to be turned off and the outdoor fan 13 of another fixed-frequency heat pump module 10 to be turned off, the number of outdoor compressors that remain turned on can be reduced, so that the actual cooling / heating capacity of the heat pump system 1 is greatly reduced to the vicinity of the actual cooling demand, and the operating power consumption of the heat pump system 1 is greatly reduced, achieving a better energy-saving effect.

[0059] S229: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within a ninth temperature difference interval, shutting down the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 .

[0060] When it is determined that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the ninth temperature difference interval, that is, the absolute value of the temperature difference is greater than the eighth temperature difference threshold, it means that the actual cooling / heating capacity of the heat pump system 1 is higher than the actual cooling demand, and the degree of excess is greater. At this time, the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 can be controlled to remain turned on, while the fixed-frequency compressor 11 and the outdoor fan 13 of the other fixed-frequency heat pump module 10 can be turned off. By controlling the fixed-frequency compressor 11 and the outdoor fan 13 of one of the fixed-frequency heat pump modules 10 to remain turned off, the number of outdoor compressors that remain turned on can be reduced, so that the actual cooling / heating capacity of the heat pump system 1 is more significantly reduced to the vicinity of the actual cooling demand, and the operating power consumption of the heat pump system 1 is reduced to a greater extent, achieving a better energy-saving effect.

[0061] Here, the values ​​of the first temperature difference threshold and the fifth temperature difference threshold may be the same or different, the values ​​of the second temperature difference threshold and the sixth temperature difference threshold may be the same or different, and the values ​​of the third temperature difference threshold and the seventh temperature difference threshold may be the same or different, and the embodiments of the present application are not limited to this.

[0062] like Figure 6 As shown, in some embodiments, the fixed-frequency heat pump module 10 may further include a gas-liquid separator 15, a high-pressure switch 16 and a low-pressure switch 17. The gas-liquid separator 15 connects the refrigerant flow channel of the water-side heat exchanger 20 and the air intake of the compressor. The low-pressure switch 17 is arranged on the connecting pipeline between the gas-liquid separator 15 and the air intake. The high-pressure switch 16 is connected to the exhaust port of the compressor. Figure 5As shown, the heat pump system control method may include S31 to S34.

[0063] S31: In response to the exhaust pressure of the gas-liquid separator 15 being lower than the first pressure threshold, the low-pressure switch 17 is turned off.

[0064] S32: In response to the exhaust pressure of the gas-liquid separator 15 being greater than or equal to the first pressure threshold, the low pressure switch 17 is turned on.

[0065] S33: In response to the exhaust pressure of the compressor being greater than the second pressure threshold, the high pressure switch 16 is turned off. Here, the first pressure threshold is less than the second pressure threshold.

[0066] S34: In response to the exhaust pressure of the compressor being less than or equal to the second pressure threshold, the high pressure switch 16 is turned on.

[0067] By setting S31~S34, the compressor can be protected against low pressure and high pressure, thereby improving the safe operation performance of the compressor.

[0068] In the second aspect, an embodiment of the present application provides a heat pump system control device, which includes: a temperature difference calculation module, configured to determine the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel; a switch control module, configured to adjust the number of fixed-frequency compressors 11 and outdoor fans 13 that are turned on according to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel.

[0069] like Figure 6 As shown, in the third aspect, an embodiment of the present application provides a heat pump system 1, which includes a plurality of fixed-frequency heat pump modules 10, a water-side heat exchanger 20, a processor and a memory. The fixed-frequency heat pump module 10 includes a fixed-frequency compressor 11, a wind-side heat exchanger 12 and an outdoor fan 13, and the outdoor fan 13 and the wind-side heat exchanger 12 are arranged correspondingly. The water-side heat exchanger 20 is provided with a coolant flow channel and a plurality of refrigerant flow channels, and the coolant flow channel and the refrigerant flow channel and any two refrigerant flow channels are arranged at intervals, and each refrigerant flow channel is connected to a fixed-frequency heat pump module 10. The memory stores a computer program, and when the computer program is executed by the processor, a heat pump system control method as provided in any of the above embodiments is implemented.

[0070] The processor is connected to the memory and can perform various actions and processes according to the program stored in the memory. Specifically, the processor can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can be an X86 architecture or an ARM architecture.

[0071] The memory may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronously linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory of the method described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0072] In some embodiments, the fixed-frequency heat pump module 10 may further include a reversing valve 14, which is respectively connected to the fixed-frequency compressor 11, the air-side heat exchanger 12, and the refrigerant flow channel. By reversing the reversing valve 14, the fixed-frequency heat pump module 10 can be switched between the cooling mode and the heating mode to achieve the cooling and heating functions.

[0073] In some embodiments, the fixed-frequency heat pump module 10 may further include a gas-liquid separator 15, a high-pressure switch 16, and a low-pressure switch 17. The gas-liquid separator 15 connects the refrigerant flow channel of the water-side heat exchanger 20 and the air intake of the compressor, the low-pressure switch 17 is arranged on the connecting pipeline between the gas-liquid separator 15 and the air intake, and the high-pressure switch 16 is arranged on the connecting pipeline between the exhaust port of the compressor and the reversing valve 14.

[0074] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored. The computer program is loaded by a processor to execute the steps in the control method of any of the above embodiments.

[0075] Exemplarily, the above-mentioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., CDs (Compact Disks), DVDs (Digital Versatile Disks), etc.), smart cards and flash memory devices (e.g., EPROMs (Erasable Programmable Read-Only Memory), cards, sticks or key drives, etc.). The various computer-readable storage media described in the embodiments of the present application may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0076] The heat pump system and its control method, device, and computer-readable storage medium provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A heat pump system control method, characterized in that: The heat pump system includes a plurality of fixed-frequency heat pump modules and a water-side heat exchanger, wherein the fixed-frequency heat pump module includes a fixed-frequency compressor, an air-side heat exchanger and an outdoor fan, wherein the outdoor fan and the air-side heat exchanger are arranged correspondingly; the water-side heat exchanger is provided with a coolant flow channel and a plurality of refrigerant flow channels, wherein the coolant flow channel and the refrigerant flow channel and any two refrigerant flow channels are arranged at intervals, and each refrigerant flow channel is connected to a fixed-frequency heat pump module, and the heat pump system control method includes: Determining the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the coolant flow channel; The number of the fixed-frequency compressors and outdoor fans turned on is adjusted according to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel.

2. The heat pump system control method according to claim 1, characterized in that: According to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel, the number of the fixed-frequency compressors and the outdoor fans turned on is adjusted, including: Determine the temperature difference range in which the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the coolant flow channel lies; According to the temperature difference range, the number of fixed-frequency compressors and outdoor fans that are turned on is adjusted.

3. The heat pump system control method according to claim 2, characterized in that: The heat pump system includes two fixed-frequency heat pump modules; According to the temperature difference range, the number of the fixed-frequency compressors and outdoor fans turned on is adjusted, including: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the first temperature difference interval, controlling the fixed-frequency compressors and the outdoor fans of the two fixed-frequency heat pump modules to remain in an on state; In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within the second temperature difference interval, turning off the outdoor fan of one of the fixed-frequency heat pump modules; In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within a third temperature difference interval, shutting down a fixed-frequency compressor of one of the fixed-frequency heat pump modules; In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within a fourth temperature difference interval, shutting down a fixed-frequency compressor and an outdoor fan of one of the fixed-frequency heat pump modules; The first temperature difference interval is a temperature difference interval that is less than or equal to a first temperature difference threshold, the second temperature difference interval is a temperature difference interval that is greater than the first temperature difference threshold and less than or equal to the second temperature difference threshold, the third temperature difference interval is a temperature difference interval that is greater than the second temperature difference threshold and less than or equal to the third temperature difference threshold, and the fourth temperature difference interval is a temperature difference interval that is greater than the third temperature difference threshold.

4. The heat pump system control method according to claim 2, characterized in that: The heat pump system includes two fixed-frequency heat pump modules; According to the temperature difference range, the number of the fixed-frequency compressors and outdoor fans turned on is adjusted, including: In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within a fifth temperature difference interval, controlling the fixed-frequency compressors and the outdoor fans of the two fixed-frequency heat pump modules to remain in an on state; In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within a sixth temperature difference interval, turning off the outdoor fan of one of the fixed-frequency heat pump modules; In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within a seventh temperature difference interval, shutting down a fixed-frequency compressor of one of the fixed-frequency heat pump modules; In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel is within an eighth temperature difference interval, shutting down the fixed-frequency compressor of one fixed-frequency heat pump module and the outdoor fan of another fixed-frequency heat pump module; In response to determining that the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the brine flow channel is within a ninth temperature difference interval, shutting down a fixed-frequency compressor and an outdoor fan of one of the fixed-frequency heat pump modules; The fifth temperature difference interval is a temperature difference interval less than or equal to the fifth temperature difference threshold, the sixth temperature difference interval is a temperature difference interval greater than the fifth temperature difference threshold and less than or equal to the sixth temperature difference threshold, the seventh temperature difference interval is a temperature difference interval greater than the sixth temperature difference threshold and less than or equal to the seventh temperature difference threshold, the eighth temperature difference interval is a temperature difference interval greater than the seventh temperature difference threshold and less than or equal to the eighth temperature difference threshold, and the ninth temperature difference interval is a temperature difference interval greater than the eighth temperature difference threshold.

5. The heat pump system control method according to claim 1, characterized in that: The fixed-frequency heat pump module further includes a gas-liquid separator, a high-pressure switch and a low-pressure switch, wherein the gas-liquid separator is connected to the refrigerant flow channel of the water-side heat exchanger and the air intake port of the compressor, the low-pressure switch is arranged on the connecting pipeline between the gas-liquid separator and the air intake port, and the high-pressure switch is connected to the exhaust port of the compressor; The heat pump system control method comprises: In response to the exhaust pressure of the gas-liquid separator being less than a first pressure threshold, the low-pressure switch is turned off; In response to the exhaust pressure of the gas-liquid separator being greater than or equal to a first pressure threshold, the low-pressure switch is turned on; In response to the exhaust pressure of the compressor being greater than a second pressure threshold, the high pressure switch is turned off; In response to the exhaust pressure of the compressor being less than or equal to a second pressure threshold, the high-pressure switch is turned on; The first pressure threshold is lower than the second pressure threshold.

6. A heat pump system control device, characterized in that: The heat pump system includes a plurality of fixed-frequency heat pump modules and a water-side heat exchanger, wherein the fixed-frequency heat pump module includes a fixed-frequency compressor, an air-side heat exchanger and an outdoor fan, wherein the outdoor fan and the air-side heat exchanger are arranged correspondingly; the water-side heat exchanger is provided with a coolant flow channel and a plurality of refrigerant flow channels, wherein the coolant flow channel and the refrigerant flow channel and any two refrigerant flow channels are arranged at intervals, and each refrigerant flow channel is connected to a fixed-frequency heat pump module, and the heat pump system control device includes: a temperature difference calculation module, configured to determine an absolute value of a temperature difference between an inlet water temperature and an outlet water temperature of the coolant flow channel; The switch control module is configured to adjust the number of the fixed-frequency compressors and outdoor fans that are turned on according to the absolute value of the temperature difference between the inlet water temperature and the outlet water temperature of the refrigerant flow channel.

7. A heat pump system, characterized in that: include: A plurality of fixed-frequency heat pump modules, including a fixed-frequency compressor, a wind-side heat exchanger and an outdoor fan, wherein the outdoor fan and the wind-side heat exchanger are arranged correspondingly; The water-side heat exchanger is provided with a coolant flow channel and a plurality of refrigerant flow channels, wherein the coolant flow channel and the refrigerant flow channel and any two refrigerant flow channels are arranged at intervals, and each refrigerant flow channel is connected to a fixed-frequency heat pump module; a memory storing a computer program; A processor, wherein when the computer program is executed by the processor, the heat pump system control method according to any one of claims 1 to 5 is implemented.

8. The heat pump system according to claim 7, characterized in that: The fixed-frequency heat pump module further includes a reversing valve, which is respectively connected to the fixed-frequency compressor, the air-side heat exchanger, and the refrigerant flow channel.

9. The heat pump system according to claim 8, characterized in that: The fixed-frequency heat pump module also includes a gas-liquid separator, a high-pressure switch and a low-pressure switch. The gas-liquid separator connects the refrigerant flow channel of the water-side heat exchanger and the air intake port of the compressor. The low-pressure switch is arranged on the connecting pipeline between the gas-liquid separator and the air intake port. The high-pressure switch is arranged on the connecting pipeline between the exhaust port of the compressor and the reversing valve.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in the heat pump system control method according to any one of claims 1 to 5.

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