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

Abstract

The application discloses a kind of control method of heat pump system, heat pump system and storage medium.Therein, the heat pump system includes first heat exchanger, throttling component, second heat exchanger and the energy storage device, the first heat exchanger, the throttling component and the second heat exchanger are sequentially connected, and the first heat exchanger is heat exchange connection with the energy storage device, and the method comprises: obtaining the back gas superheat of the heat pump system and the heat exchange temperature difference value of the energy storage device;According to the back gas superheat and the heat exchange temperature difference value control the throttling component operation.The present application aims at improving system energy efficiency while prolonging the service life of throttling component.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and more particularly to a control method for a heat pump system, a heat pump system, and a storage medium. Background Technology

[0002] Heat pump systems can be equipped with energy storage devices (such as water tanks) to store the energy of the heat exchanger using water or other energy storage media. Currently, the opening degree of the throttling device in a heat pump system is generally adjusted based on the return gas superheat. However, this method not only easily ignores the energy storage requirements of the energy storage device, resulting in low energy storage efficiency and affecting system energy efficiency, but also causes frequent adjustments to the throttling device, affecting its service life. Summary of the Invention

[0003] The main objective of this invention is to provide a control method for a heat pump system, a heat pump system, and a storage medium, aiming to improve system energy efficiency while extending the service life of throttling components.

[0004] To achieve the above objectives, the present invention provides a control method for a heat pump system. The heat pump system includes a first heat exchanger, a throttling component, a second heat exchanger, and an energy storage device. The first heat exchanger, the throttling component, and the second heat exchanger are connected sequentially. The first heat exchanger is heat-exchange connected to the energy storage device. The control method for the heat pump system includes the following steps:

[0005] Obtain the return gas superheat of the heat pump system and the heat exchange temperature difference of the energy storage device;

[0006] The operation of the throttling component is controlled based on the return gas superheat and the heat exchange temperature difference.

[0007] Optionally, controlling the operation of the throttling component based on the return gas superheat and the heat exchange temperature difference includes:

[0008] When the return gas superheat is less than the first preset superheat, the throttling component is controlled to reduce its opening.

[0009] When the return gas superheat is greater than or equal to the first preset superheat, the throttling component is controlled to operate according to the superheat range where the return gas superheat is located and the heat exchange temperature difference value.

[0010] Optionally, the step of controlling the operation of the throttling component based on the superheat range of the return gas superheat and the heat exchange temperature difference includes:

[0011] When the return gas superheat is within the first superheat range, the throttling component is controlled to increase its opening.

[0012] When the return gas superheat is in the second superheat range and the heat exchange temperature difference is greater than or equal to the preset temperature difference value, the throttling component is controlled to maintain the current opening.

[0013] When the return gas superheat is within the second superheat range and the heat exchange temperature difference is less than the preset temperature difference, the throttling component is controlled to reduce its opening.

[0014] Wherein, the first superheat range is greater than the second preset superheat, the second superheat range is less than or equal to the second preset superheat and greater than or equal to the first preset superheat, and the second preset superheat is greater than the first preset superheat.

[0015] Optionally, when the return gas superheat is less than the first preset superheat, the throttling component reduces its opening by a first opening adjustment value; when the return gas superheat is within the second preset superheat and the heat exchange temperature difference is less than the preset temperature difference, the throttling component reduces its opening by a second opening adjustment value, wherein the first opening adjustment value is greater than the second opening adjustment value.

[0016] Optionally, the step of controlling the throttling component to increase its opening includes:

[0017] The third opening adjustment value is determined based on the heat exchange temperature difference value, and the third opening adjustment value is positively correlated with the heat exchange temperature difference value;

[0018] The throttling component is controlled to increase its opening based on the third opening adjustment value.

[0019] Optionally, the step of determining the third opening adjustment value based on the heat exchange temperature difference value includes:

[0020] When the heat exchange temperature difference is greater than or equal to the preset temperature difference, the preset opening adjustment value is determined to be the third opening adjustment value;

[0021] When the heat exchange temperature difference is less than the preset temperature difference, the preset opening adjustment value is reduced to obtain the third opening adjustment value.

[0022] Optionally, the step of obtaining the heat exchange temperature difference value of the energy storage device includes:

[0023] When the first heat exchanger is in a condensing state, the energy storage temperature of the energy storage device is obtained, and the exhaust temperature of the compressor in the heat pump system is obtained.

[0024] The heat exchange temperature difference is determined based on the temperature difference between the exhaust temperature and the energy storage temperature.

[0025] Optionally, the step of obtaining the energy storage temperature of the energy storage device includes:

[0026] Obtain the upper and lower temperatures within the energy storage device;

[0027] The energy storage temperature is determined based on the average of the upper and lower temperatures.

[0028] Optionally, the step of obtaining the return gas superheat of the heat pump system includes:

[0029] Obtain the evaporation temperature of the heat pump system and the return gas temperature of the compressor in the heat pump system;

[0030] The return gas superheat is determined based on the temperature difference between the return gas temperature and the evaporation temperature.

[0031] In addition, to achieve the above objectives, this application also proposes a heat pump system, which includes a control device, a first heat exchanger, a throttling component, a second heat exchanger, and the energy storage device. The first heat exchanger, the throttling component, and the second heat exchanger are connected in sequence, and the first heat exchanger is heat-exchangingly connected to the energy storage device.

[0032] The throttling component is connected to the control device, which includes a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, it implements the steps of the control method for the heat pump system as described in any of the preceding claims.

[0033] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for the heat pump system as described in any of the preceding claims.

[0034] This invention proposes a control method for a heat pump system. The heat pump system includes an energy storage device connected to a first heat exchanger. This method combines the return gas superheat of the heat pump system with the heat exchange temperature difference of the energy storage device to regulate the opening of a throttling component between the first and second heat exchangers. The heat exchange temperature difference accurately reflects the energy storage demand of the energy storage device, which helps improve the energy storage efficiency of the device and thus enhances the system's energy efficiency. Furthermore, compared to solely regulating the operation of the throttling component based on the return gas superheat, combining the heat exchange temperature difference and the return gas superheat helps reduce the frequency of throttling component adjustments while maintaining adjustment accuracy, thereby improving system energy efficiency and extending the service life of the throttling component. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the system structure of an embodiment of the heat pump system of the present invention;

[0036] Figure 2This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the heat pump system of the present invention;

[0037] Figure 3 This is a flowchart illustrating an embodiment of the control method for the heat pump system of the present invention;

[0038] Figure 4 This is a schematic flowchart of another embodiment of the control method for the heat pump system of the present invention;

[0039] Figure 5 This is a detailed flowchart illustrating how the operation of the throttling component is controlled based on the superheat range of the return gas superheat and the heat exchange temperature difference in an embodiment of the control method for the heat pump system of the present invention.

[0040] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0042] This invention provides a heat pump system.

[0043] In this embodiment of the invention, reference is made to Figure 1 and Figure 2 The heat pump system includes a control device 100, a compressor 1, a first heat exchanger 2, a throttling component 3, a second heat exchanger 4, and an energy storage device 5. The first heat exchanger 2, the throttling component 3, and the second heat exchanger 4 are connected in sequence, and the first heat exchanger 2 is connected to the energy storage device 5 for heat exchange.

[0044] The energy storage device 5 contains an energy storage medium. When the refrigerant flows through the first heat exchanger 2, it can exchange heat with the energy storage medium, which can store the cold or heat absorbed from the refrigerant. In this embodiment, the energy storage device 5 is an insulated water tank, which consists of an inner liner, an insulation layer, and an outer shell from the inside out. The first heat exchanger 2 is located between the inner liner and the insulation layer. The first heat exchanger 2 is a microchannel heat exchanger (i.e., a parallel flow heat exchanger) and is tightly wrapped around the outer wall of the inner liner.

[0045] In this embodiment, the throttling component 3 is an electronic expansion valve with an opening adjustment range of 0-500P (pulse). In other embodiments, the electronic expansion valve may also be other throttling components 3 with adjustable opening.

[0046] The first heat exchanger 2 and the second heat exchanger 4 are respectively connected to the exhaust port of the compressor 1 and the return port of the compressor 1.

[0047] In one implementation, the exhaust port of compressor 1, the first heat exchanger 2, the throttling device 3, the second heat exchanger 4, and the return port of compressor 1 are connected in sequence. When compressor 1 is turned on, the refrigerant discharged by compressor 1 flows sequentially through the first heat exchanger 2 for heat exchange, the throttling device 3 for throttling, and the second heat exchanger 4 for heat exchange before flowing back to compressor 1. The first heat exchanger 2 is in a condensing state, and the second heat exchanger 4 is in an evaporating state.

[0048] In another implementation, the heat pump system also includes a reversing assembly 6 (e.g., a four-way valve). The exhaust port of the compressor 1, the return port of the compressor 1, the first heat exchanger 2, and the second heat exchanger 4 are all connected to the reversing assembly 6. When the reversing assembly 6 is running in the first state, the exhaust port of the compressor 1, the first heat exchanger 2, the throttling device 3, the second heat exchanger 4, and the return port of the compressor 1 are connected in sequence. When the compressor 1 is turned on, the refrigerant discharged by the compressor 1 flows through the first heat exchanger 2 for heat exchange, the throttling device 3 for throttling, and the second heat exchanger 4 for heat exchange before flowing back to the compressor 1. The compressor 1 is in heating mode, the first heat exchanger 2 is in condensation mode, and the second heat exchanger 4 is in evaporation mode. When the refrigerant flows through the first heat exchanger 2, the heat is stored in the energy storage device 5. When the reversing assembly 6 is running in the second state, the exhaust port of the compressor 1, the second heat exchanger 4, the throttling component 3, the first heat exchanger 2, and the return port of the compressor 1 are connected in sequence. When the compressor 1 is turned on, the refrigerant discharged by the compressor 1 flows through the second heat exchanger 4 for heat exchange, the throttling component 3 for throttling, and the first heat exchanger 2 for heat exchange before flowing back to the compressor 1. The compressor 1 is in the cooling mode, the first heat exchanger 2 is in the evaporation state, and the second heat exchanger 4 is in the condensation state. When the refrigerant flows through the first heat exchanger 2, the cold energy is stored in the energy storage device 5.

[0049] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes an exhaust temperature sensor 01 connected to the control device 100, which is located on the exhaust pipe of the compressor 1 to detect the exhaust temperature of the compressor 1.

[0050] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes a return gas temperature sensor 02 connected to the control device 100, which is located on the return gas pipe of the compressor 1 to detect the return gas temperature of the compressor 1.

[0051] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes an upper temperature sensor 03 connected to the control device 100, which is located in the upper part of the energy storage device 5 (e.g., in the upper part of the energy storage medium, such as the upper part of the outer wall of the water tank liner) to detect the upper temperature inside the energy storage device 5.

[0052] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes a lower temperature sensor 04 connected to the control device 100, which is located in the lower part of the energy storage device 5 (e.g., the lower part of the outer wall of the water tank or in the lower energy storage medium) to detect the lower temperature inside the energy storage device 5.

[0053] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes an evaporation temperature sensor 05 connected to the control device 100, located at the inlet of the evaporator, for detecting the evaporation temperature.

[0054] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes an ambient temperature sensor 06 connected to the control device 100, which is located on the fins on the windward side of the first heat exchanger 2 and / or the second heat exchanger 4 to detect the temperature of the ambient air flowing through the evaporator.

[0055] In this embodiment of the invention, reference is made to Figure 2 The control device 100 of the heat pump system includes a processor 1001, such as a CPU, a memory 1002, and a timer 1003. These components communicate with each other via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0056] Those skilled in the art will understand that Figure 2 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0057] like Figure 2 As shown, the memory 1002, which serves as a computer storage medium, may include a control program for a heat pump system.

[0058] exist Figure 2 In the device shown, the processor 1001 can be used to call the control program of the heat pump system stored in the memory 1002 and execute the relevant steps of the control method of the heat pump system in the following embodiments.

[0059] This invention also provides a control method for a heat pump system, applied to the aforementioned heat pump system.

[0060] Reference Figure 3 This application proposes an embodiment of a control method for a heat pump system. In this embodiment, the control method for the heat pump system includes:

[0061] Step S10: Obtain the return gas superheat of the heat pump system and the heat exchange temperature difference of the energy storage device;

[0062] In this embodiment, when the heat pump system is operating in heating mode, step S10 is executed. In heating mode, the first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state. In other embodiments, step S10 may also be executed when the heat pump system is operating in other modes.

[0063] The return gas superheat and heat exchange temperature difference can be determined by obtaining temperature data detected by the temperature detection module set on the heat pump system, or by obtaining pressure data detected by the pressure detection module set on the heat pump system.

[0064] Among them, the heat exchange temperature difference value represents the temperature change of the refrigerant before and after entering the energy storage device.

[0065] Step S20: Control the operation of the throttling component based on the return gas superheat and the heat exchange temperature difference.

[0066] The opening control parameters of the throttling component are determined based on the return gas superheat and heat exchange temperature difference, and the operation of the throttling component is controlled according to the opening control parameters. The opening control parameters include, but are not limited to: opening adjustment direction (such as increasing the opening, decreasing the opening, or maintaining the opening), target opening, opening limit value (such as the upper limit or lower limit of the opening), opening adjustment value (opening adjustment ratio or opening adjustment amplitude, etc.), and opening adjustment rate.

[0067] Different return gas superheats and different heat exchange temperature differences correspond to different opening control parameters. A pre-established correspondence between return gas superheat, heat exchange temperature difference, and opening control parameters is established. This correspondence can include calculation relationships, mapping relationships, etc. Based on this correspondence, the opening control parameters corresponding to the return gas superheat and heat exchange temperature difference can be determined.

[0068] In one implementation, the energy efficiency characteristic value of the heat pump system can be calculated by combining the return gas superheat and the heat exchange temperature difference, and the opening control parameters of the throttling component can be determined based on the numerical range of the energy efficiency characteristic value.

[0069] In another implementation, the opening control parameters of the throttling component can be determined based on the superheat range where the return gas superheat is located and the temperature difference range where the heat exchange temperature difference value is located.

[0070] In another implementation, the opening control parameters of the throttling component can be determined based on the relationship between the return gas superheat and the preset superheat, as well as the relationship between the heat exchange temperature difference and the preset temperature difference.

[0071] This invention proposes a control method for a heat pump system. The heat pump system includes an energy storage device connected to a first heat exchanger. This method combines the return gas superheat of the heat pump system with the heat exchange temperature difference of the energy storage device to regulate the opening of a throttling component between the first and second heat exchangers. The heat exchange temperature difference accurately reflects the energy storage demand of the energy storage device, which helps improve the energy storage efficiency of the device and thus enhances the system's energy efficiency. Furthermore, compared to controlling the operation of the throttling component solely based on the return gas superheat, combining the heat exchange temperature difference and the return gas superheat helps reduce the adjustment frequency of the throttling component while maintaining adjustment accuracy, thereby improving system energy efficiency and extending the service life of the throttling component.

[0072] Furthermore, after step S20, the process can return to step S10 to achieve dynamic adjustment of the throttling components during the operation of the heat pump system, thereby ensuring that the system can maintain a better energy efficiency state.

[0073] Furthermore, in this embodiment, the step of obtaining the return gas superheat of the heat pump system includes: obtaining the evaporation temperature of the heat pump system and the return gas temperature of the compressor in the heat pump system; and determining the return gas superheat based on the temperature difference between the return gas temperature and the evaporation temperature. Specifically, the return gas temperature can be obtained by acquiring the temperature data detected by the aforementioned return gas temperature sensor. The evaporation temperature can be obtained by acquiring the data detected by the aforementioned evaporation temperature sensor.

[0074] The temperature difference between the return gas temperature and the evaporation temperature can be directly used as the return gas superheat, or the temperature difference between the return gas temperature and the evaporation temperature can be corrected by a coefficient and used as the return gas superheat.

[0075] In this embodiment, the return gas superheat is determined by the temperature difference between the return gas temperature and the evaporation temperature, which helps to accurately reflect the energy efficiency of the system and thus helps to further improve the system's energy efficiency.

[0076] In other embodiments, the inlet and outlet temperatures of the first heat exchanger can be detected by temperature sensors at both ends of the first heat exchanger, and the return gas superheat can be determined by the temperature difference between the inlet and outlet temperatures.

[0077] Furthermore, in this embodiment, the step of obtaining the heat exchange temperature difference value of the energy storage device includes: when the first heat exchanger is in a condensation state, obtaining the energy storage temperature of the energy storage device and obtaining the exhaust temperature of the compressor in the heat pump system; and determining the heat exchange temperature difference value based on the temperature difference between the exhaust temperature and the energy storage temperature.

[0078] The energy storage temperature here can be the temperature detected directly by the temperature sensor installed inside the energy storage device, or it can be determined based on the temperature detected by the temperature sensor.

[0079] In this embodiment, the step of obtaining the energy storage temperature of the energy storage device includes: obtaining the upper temperature and the lower temperature within the energy storage device; and determining the energy storage temperature based on the average of the upper and lower temperatures. Here, the average can be the sum of the upper and lower temperatures, i.e., energy storage temperature = (upper temperature + lower temperature) / 2. Alternatively, it can be a weighted average obtained by weighting the upper and lower temperatures according to a first weight corresponding to the upper temperature and a second weight corresponding to the lower temperature.

[0080] The temperature difference between the exhaust temperature and the energy storage temperature can be directly used as the heat exchange temperature difference, or the temperature difference between the exhaust temperature and the energy storage temperature can be corrected by a correction value and used as the heat exchange temperature difference.

[0081] In this embodiment, the heat exchange temperature difference value determined in the above manner can accurately reflect the heat exchange requirements of the heat pump system's heavy energy storage device. Based on this determined heat exchange temperature difference value, combined with the return gas superheat control throttling component operation, it is beneficial to further improve energy storage efficiency, so as to achieve effective improvement of system energy efficiency.

[0082] Furthermore, based on the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, reference is made to... Figure 4 Step S20 includes:

[0083] Step S21: When the return gas superheat is less than the first preset superheat, control the throttling component to reduce its opening.

[0084] The first preset superheat is the minimum allowable return gas superheat when the system reaches the target energy efficiency state.

[0085] The throttling component can reduce its opening by a preset fixed adjustment value, or by determining the opening adjustment value based on the difference between the first preset superheat and the return gas superheat, or by determining the opening adjustment value based on the heat exchange temperature difference, or by determining the opening adjustment value based on the temperature difference between the current temperature of the energy storage device and the set temperature, and so on.

[0086] Step S22: When the return gas superheat is greater than or equal to the first preset superheat, the throttling component is controlled to operate according to the superheat range where the return gas superheat is located and the heat exchange temperature difference value.

[0087] Specifically, at least two preset superheat intervals can be defined in advance, such as two, three, four, or more. The superheat interval in which the return gas superheat falls within these two preset intervals is determined. Based on this superheat interval and the heat exchange temperature difference, the target adjustment parameter for the throttling device is determined, and the current opening of the throttling device is adjusted according to the target adjustment parameter. Alternatively, a reference opening can be determined based on the superheat interval, and an opening adjustment value can be determined based on the heat exchange temperature difference. The reference opening is then adjusted according to the opening adjustment value to obtain the target opening. The throttling device is then controlled to operate according to the target adjustment parameter or the target opening.

[0088] The specific order in which steps S21 and S22 are executed is not limited.

[0089] In this embodiment, when the return gas superheat is too low, reducing the opening of the electronic expansion valve is beneficial to increasing the return gas superheat and improving the energy efficiency of the heat pump system. When the return gas superheat is high, the opening of the throttling component is controlled by combining the range of return gas superheat and the heat exchange temperature difference, thereby ensuring that the system maintains high energy efficiency while improving the energy storage efficiency of the energy storage device.

[0090] Furthermore, in this embodiment, referring to Figure 5 The step of controlling the operation of the throttling component based on the superheat range of the return gas superheat and the heat exchange temperature difference includes:

[0091] Step S221: When the return gas superheat is within the first superheat range, control the throttling component to increase the opening degree, and the first superheat range is greater than the second preset superheat.

[0092] The second preset superheat is specifically the maximum allowable return gas superheat when the heat pump system reaches the target energy efficiency state. When the return gas superheat is within the first superheat range, it indicates that the return gas superheat is too high and the system energy efficiency is poor.

[0093] The throttling component can increase its opening by increasing the opening according to a preset fixed adjustment value, or by determining the opening adjustment value based on the difference between the second preset superheat and the return gas superheat and / or the heat exchange temperature difference and / or the temperature difference between the current temperature of the energy storage device and the set temperature, etc.

[0094] Step S222: When the return gas superheat is in the second superheat range and the heat exchange temperature difference is greater than or equal to the preset temperature difference value, control the throttling component to maintain the current opening.

[0095] When the return gas superheat is within the second superheat range, it indicates that the return gas superheat is moderate and the system energy efficiency is at its best.

[0096] The preset temperature difference value is used to distinguish whether the energy storage efficiency of the energy storage device can meet the critical temperature difference value. When the heat exchange temperature difference value is greater than or equal to the preset temperature difference value, it indicates that the heat exchange effect between the first heat exchanger and the energy storage device is good, and the energy storage efficiency is high.

[0097] Step S223: When the return gas superheat is within the second superheat range and the heat exchange temperature difference is less than the preset temperature difference, control the throttling component to reduce the opening; wherein, the second superheat range is less than or equal to the second preset superheat and greater than or equal to the first preset superheat, and the second preset superheat is greater than the first preset superheat.

[0098] When the heat exchange temperature difference is less than the preset temperature difference, it indicates that the heat exchange effect between the first heat exchanger and the energy storage device is poor and the energy storage efficiency is low.

[0099] The throttling component can reduce the opening by reducing the large opening according to a preset fixed adjustment value, or by determining the opening adjustment value based on the difference between the second preset superheat and the return gas superheat and / or the heat exchange temperature difference and / or the temperature difference between the current temperature of the energy storage device and the set temperature and / or the current temperature of the energy storage medium inlet in the energy storage device, etc.

[0100] In this embodiment, when the return gas superheat is too high, increasing the opening of the throttling device helps to reduce the return gas superheat, thereby effectively improving the system energy efficiency. When the energy storage efficiency of the energy storage device is low within a suitable range of return gas superheat, decreasing the opening of the throttling device helps to increase the pressure difference across the throttling device, effectively increasing the exhaust temperature and the heat exchange temperature difference, thereby improving the energy storage efficiency and further enhancing the system energy efficiency. When the energy storage efficiency of the energy storage device is high within a suitable range of return gas superheat, maintaining the current opening of the throttling device ensures that the system maintains a better energy efficiency state while reducing unnecessary adjustments to the throttling device, effectively extending the lifespan of the throttling device.

[0101] Furthermore, in this embodiment, when the return gas superheat is less than the first preset superheat, the throttling component reduces its opening by the first opening adjustment value; when the return gas superheat is within the second preset superheat and the heat exchange temperature difference is less than the preset temperature difference, the throttling component reduces its opening by the second opening adjustment value, wherein the first opening adjustment value is greater than the second opening adjustment value.

[0102] For example, when the return gas superheat is less than the first preset superheat, the throttling component is reduced by 16P from the current opening. When the heat exchange temperature difference is less than the preset temperature difference within the second preset superheat, the throttling component is reduced by 8P from the current opening.

[0103] In this embodiment, when the return gas superheat is small, a larger adjustment value is used to adjust the opening of the throttling device, and when the return gas superheat is within a suitable range, a smaller adjustment value is used to adjust the opening of the throttling device, which helps to ensure that the heat pump system can maintain a better energy efficiency state.

[0104] Furthermore, in this embodiment, the step of controlling the throttling component to increase its opening degree includes: determining a third opening degree adjustment value based on the heat exchange temperature difference value, wherein the third opening degree adjustment value is positively correlated with the heat exchange temperature difference value; and controlling the throttling component to increase its opening degree based on the third opening degree adjustment value.

[0105] In one implementation, the temperature difference range where the heat exchange temperature difference value is located is determined, and the third opening adjustment value is determined based on the temperature difference range.

[0106] In another implementation, the heat exchange temperature difference is substituted into a preset formula to calculate the third opening adjustment value.

[0107] In another implementation, the relationship between the heat exchange temperature difference and a preset temperature difference is determined, and a third opening adjustment value is determined based on this relationship. When the heat exchange temperature difference is greater than or equal to the preset temperature difference, the preset opening adjustment value is determined to be the third opening adjustment value; when the heat exchange temperature difference is less than the preset temperature difference, the preset opening adjustment value is decreased to obtain the third opening adjustment value. For example, if the preset opening adjustment value is 16P, when the heat exchange temperature difference is greater than or equal to the preset temperature difference, the third opening adjustment value is 16P; when the heat exchange temperature difference is less than the preset temperature difference, the third adjustment value is 16P-8P, and then 8P is added to the current opening of the throttling device as the target opening for the throttling device operation.

[0108] In this embodiment, determining the opening adjustment value of the throttling component when increasing its opening in the manner described above is beneficial for the energy storage efficiency to be accurately improved to the target heat exchange efficiency after the opening of the throttling component is adjusted, thereby further improving the system energy efficiency.

[0109] Furthermore, embodiments of the present invention also propose a storage medium storing a control program for a heat pump system. When the control program for the heat pump system is executed by a processor, it implements the relevant steps of any embodiment of the control method for the heat pump system described above.

[0110] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0111] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0112] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0113] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system includes a first heat exchanger, a throttling component, a second heat exchanger, and an energy storage device. The first heat exchanger, the throttling component, and the second heat exchanger are connected in sequence. The first heat exchanger is connected to the energy storage device for heat exchange. The control method of the heat pump system includes the following steps: When the heat pump system is in heating mode, the return gas superheat of the heat pump system and the heat exchange temperature difference of the energy storage device are obtained; in the heating mode, the first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state. The operation of the throttling component is controlled based on the return gas superheat and the heat exchange temperature difference. The method of controlling the operation of the throttling component based on the return gas superheat and the heat exchange temperature difference includes: When the return gas superheat is greater than or equal to the first preset superheat, the throttling component is controlled to operate according to the superheat range where the return gas superheat is located and the heat exchange temperature difference value. The step of controlling the operation of the throttling component based on the superheat range of the return gas superheat and the heat exchange temperature difference includes: When the return gas superheat is within the second superheat range and the heat exchange temperature difference is less than the preset temperature difference, the throttling component is controlled to reduce its opening. The second superheat range is less than or equal to the second preset superheat and greater than or equal to the first preset superheat, wherein the second preset superheat is greater than the first preset superheat.

2. The control method for a heat pump system as described in claim 1, characterized in that, The method of controlling the operation of the throttling component based on the return gas superheat and the heat exchange temperature difference includes: When the return gas superheat is less than the first preset superheat, the throttling component is controlled to reduce its opening.

3. The control method for a heat pump system as described in claim 1, characterized in that, The step of controlling the operation of the throttling component based on the superheat range of the return gas superheat and the heat exchange temperature difference includes: When the return gas superheat is within the first superheat range, the throttling component is controlled to increase its opening. When the return gas superheat is in the second superheat range and the heat exchange temperature difference is greater than or equal to the preset temperature difference value, the throttling component is controlled to maintain the current opening. Wherein, the first superheat range is greater than the second preset superheat range.

4. The control method for a heat pump system as described in claim 3, characterized in that, When the return gas superheat is less than the first preset superheat, the throttling component reduces its opening by the first opening adjustment value. When the return gas superheat is within the second preset superheat and the heat exchange temperature difference is less than the preset temperature difference, the throttling component reduces its opening by the second opening adjustment value. The first opening adjustment value is greater than the second opening adjustment value.

5. The control method for a heat pump system as described in claim 3, characterized in that, The step of controlling the throttling component to increase its opening includes: The third opening adjustment value is determined based on the heat exchange temperature difference value, and the third opening adjustment value is positively correlated with the heat exchange temperature difference value; The throttling component is controlled to increase its opening based on the third opening adjustment value.

6. The control method for a heat pump system as described in claim 5, characterized in that, The step of determining the third opening adjustment value based on the heat exchange temperature difference value includes: When the heat exchange temperature difference is greater than or equal to the preset temperature difference, the preset opening adjustment value is determined to be the third opening adjustment value; When the heat exchange temperature difference is less than the preset temperature difference, the preset opening adjustment value is reduced to obtain the third opening adjustment value.

7. The control method for a heat pump system as described in any one of claims 1 to 6, characterized in that, The steps for obtaining the heat exchange temperature difference value of the energy storage device include: When the first heat exchanger is in a condensing state, the energy storage temperature of the energy storage device is obtained, and the exhaust temperature of the compressor in the heat pump system is obtained. The heat exchange temperature difference is determined based on the temperature difference between the exhaust temperature and the energy storage temperature.

8. The control method for a heat pump system as described in claim 7, characterized in that, The step of obtaining the energy storage temperature of the energy storage device includes: Obtain the upper and lower temperatures within the energy storage device; The energy storage temperature is determined based on the average of the upper and lower temperatures.

9. The control method for a heat pump system as described in any one of claims 1 to 6, characterized in that, The steps for obtaining the return gas superheat of the heat pump system include: Obtain the evaporation temperature of the heat pump system and the return gas temperature of the compressor in the heat pump system; The return gas superheat is determined based on the temperature difference between the return gas temperature and the evaporation temperature.

10. A heat pump system, characterized in that, The heat pump system includes a control device, a first heat exchanger, a throttling component, a second heat exchanger, and the energy storage device. The first heat exchanger, the throttling component, and the second heat exchanger are connected in sequence, and the first heat exchanger is heat-exchangingly connected to the energy storage device. The throttling component is connected to the control device, which includes a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, it implements the steps of the control method for the heat pump system as described in any one of claims 1 to 9.

11. A storage medium, characterized in that, The storage medium stores a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for a heat pump system as described in any one of claims 1 to 9.

Images