Expansion valve control method and system considering constitutive configuration of air source heat pump

Abstract

The invention discloses an expansion valve control method and system considering constitutive configuration of an air source heat pump. The expansion valve control method comprises the steps that the environment temperature, the condensation side water inlet temperature, the condensation side water outlet temperature, the water mass flow rate, the compressor frequency, the exhaust temperature and the exhaust pressure are obtained; calculating and determining a theoretical evaporation temperature, a theoretical condensation temperature and an actual exhaust superheat degree according to the acquired data and constitutive configuration parameters of the air source heat pump; calculating the temperature deviation between the exhaust temperature of the compressor and the exhaust alarm limit temperature; when the temperature deviation is larger than or equal to a set temperature deviation threshold value, the target exhaust superheat degree is calculated and determined according to the compressor frequency, the theoretical evaporation temperature, the theoretical condensation temperature and a target exhaust superheat degree calculation model; and according to the target exhaust superheat degree and the actual exhaust superheat degree, the exhaust superheat degree of the expansion valve is controlled. Accurate control over the expansion valve of the air source heat pump is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion valve control of an air source heat pump, and in particular to an expansion valve control method and system considering the constitutive configuration of an air source heat pump. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In recent years, air source heat pumps, as a highly efficient and energy-saving clean energy technology, have received unprecedented attention in the construction field. Compared with traditional heating methods such as coal burning, air source heat pumps have significant energy-saving and environmental protection advantages, and have become a key technology for achieving clean heating and dual carbon goals.

[0004] In the air source heat pump system, the electronic expansion valve is a key component. Its precise control directly affects the energy efficiency and stability of the system and is a key factor in ensuring the safe and efficient operation of the air source heat pump. The traditional electronic expansion valve control strategy usually takes the compressor suction superheat as the control target. However, at low ambient temperatures, the suction superheat is small, the measurement point accuracy requirements are high, and the control difficulty increases, which can easily lead to system oscillation, resulting in large errors in the control process, thereby reducing the unit's operating energy efficiency.

[0005] In contrast, controlling the opening of the expansion valve by exhaust superheat does not require high measurement point accuracy, and can effectively solve the system oscillation problem during the above-mentioned suction superheat control. However, the compressor exhaust superheat is not only related to the compressor frequency, ambient temperature and water supply temperature, but also restricted by the constitutive configuration parameters of the air source heat pump, including the evaporator heat exchange area, compressor stroke volume, fan air volume, condenser heat transfer coefficient, condensation side heat exchange area, etc. The constitutive configuration parameters affect the exhaust superheat by affecting the evaporation and condensation temperatures. However, when the related art controls the exhaust superheat of the expansion valve, the influence of the constitutive configuration parameters of the air source heat pump is not considered, resulting in low control accuracy of the expansion valve. Summary of the invention

[0006] In order to solve the above problems, the present invention proposes an expansion valve control method and system considering the constitutive configuration of an air source heat pump, establishes an exhaust superheat target calculation model considering the constitutive configuration parameters of the air source heat pump, and takes the constitutive configuration parameters of the air source heat pump into consideration when controlling the expansion valve, thereby improving the control accuracy of the expansion valve.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] Firstly, an expansion valve control method considering the constitutive configuration of an air source heat pump is proposed, including:

[0009] Obtain the ambient temperature, the inlet and outlet water temperatures and water mass flow rate on the condensing side, as well as the compressor frequency, exhaust temperature and exhaust pressure;

[0010] According to the acquired data and the constitutive configuration parameters of the air source heat pump, the theoretical evaporation temperature and the theoretical condensation temperature are calculated according to the theoretical evaporation temperature model and the theoretical condensation temperature model;

[0011] Calculate the actual condensing temperature based on the compressor exhaust pressure and refrigerant physical parameters, and calculate the actual exhaust superheat based on the actual condensing temperature;

[0012] Calculate the temperature deviation between the compressor exhaust temperature and the exhaust alarm limit temperature;

[0013] When the temperature deviation is greater than or equal to the set temperature deviation threshold, the target exhaust superheat is calculated and determined according to the compressor frequency, theoretical evaporation temperature and theoretical condensation temperature and the target exhaust superheat calculation model; wherein the target exhaust superheat calculation model is fitted by the compressor sample data, and the compressor sample data includes the existing theoretical evaporation temperature, compressor frequency, theoretical condensation temperature and the corresponding target exhaust superheat;

[0014] The exhaust superheat is controlled on the expansion valve according to the target exhaust superheat and the actual exhaust superheat.

[0015] Furthermore, according to the target exhaust superheat and the actual exhaust superheat, the process of controlling the exhaust superheat of the expansion valve includes:

[0016] Calculating the superheat error between the actual exhaust superheat and the target exhaust superheat;

[0017] When the superheat error is greater than the set superheat error threshold, the expansion valve is PID controlled according to the target exhaust superheat; when the superheat error is less than or equal to the set superheat error threshold, the system continues to operate smoothly.

[0018] Furthermore, when the temperature deviation is less than a set temperature deviation threshold, the expansion valve is PID controlled according to the target exhaust temperature.

[0019] Furthermore, the target exhaust superheat calculation model is:

[0020] T set_dsh =

[0021] (18.228-0.081829n—0.0049469T e +0.090717T c +0.0013215n 2 +0.029106

[0022] Te 2 +0.0085057T c 2 +0.0013556nT e -0.0028757nT c -0.027437T e T c )×γ _1

[0023] Where, T set_dsh is the target exhaust superheat, T e is the theoretical evaporation temperature, T c is the theoretical condensing temperature, n is the compressor frequency, γ _1 is the correction factor.

[0024] Furthermore, the theoretical evaporation temperature model is:

[0025]

[0026] Where, T a is the ambient temperature, n is the compressor frequency, G is the rated air volume of the outdoor fan, F e is the outdoor heat exchange area on the evaporation side, V o is the compressor stroke volume, T e is the theoretical evaporation temperature, α is the correction coefficient;

[0027] The theoretical condensation temperature model is:

[0028]

[0029] Where m is the mass flow rate of water on the condensing side, t1 and t2 are the inlet and outlet water temperatures on the condensing side, and F c is the heat exchange area on the condensation side, K is the heat exchange coefficient on the condensation side, T c is the theoretical condensation temperature, β is the correction coefficient; c is the specific heat capacity of water.

[0030] Furthermore, the actual exhaust gas superheat is equal to the compressor exhaust gas temperature minus the actual condensing temperature.

[0031] Secondly, an expansion valve control system considering the constitutive configuration of the air source heat pump is proposed, including:

[0032] A data acquisition module is used to obtain the ambient temperature, the inlet and outlet water temperatures and the water mass flow rate on the condensing side, as well as the compressor frequency, exhaust temperature and exhaust pressure;

[0033] Theoretical temperature and actual exhaust superheat calculation module is used to calculate the theoretical evaporation temperature and theoretical condensation temperature according to the acquired data and the constitutive configuration parameters of the air source heat pump, according to the theoretical evaporation temperature model and the theoretical condensation temperature model; calculate the actual condensation temperature according to the compressor exhaust pressure and refrigerant physical parameters, and calculate the actual exhaust superheat according to the actual condensation temperature;

[0034] A temperature deviation calculation module is used to calculate the temperature deviation between the compressor exhaust temperature and the exhaust alarm limit temperature;

[0035] The target exhaust superheat calculation module is used to calculate and determine the target exhaust superheat according to the compressor frequency, theoretical evaporation temperature and theoretical condensation temperature according to the target exhaust superheat calculation model when the temperature deviation is greater than or equal to the set temperature deviation threshold; wherein the target exhaust superheat calculation model is fitted by the compressor sample data, and the compressor sample data includes the existing theoretical evaporation temperature, compressor frequency, theoretical condensation temperature and the corresponding target exhaust superheat;

[0036] The expansion valve control module is used to control the exhaust superheat of the expansion valve according to the target exhaust superheat and the actual exhaust superheat.

[0037] In a third aspect, a computer device is provided, the device comprising:

[0038] a processor adapted to execute a computer program;

[0039] A computer-readable storage medium having a computer program stored therein, wherein when the computer program is executed by the processor, the expansion valve control method considering the constitutive configuration of the air source heat pump proposed in the first aspect is implemented.

[0040] In a fourth aspect, a computer-readable storage medium is proposed, wherein the computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor and executing the expansion valve control method considering the constitutive configuration of the air source heat pump proposed in the first aspect.

[0041] In a fifth aspect, a computer program product is proposed, which includes a computer program. When the computer program is executed by a processor, the expansion valve control method considering the constitutive configuration of the air source heat pump proposed in the first aspect is implemented.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The present invention proposes an expansion valve control method and system that take into account the constitutive configuration of an air source heat pump. The method obtains the ambient temperature, the inlet water temperature, the outlet water temperature and the mass flow rate of water on the condensing side, and the compressor frequency, the exhaust temperature and the exhaust pressure; then, according to the acquired data and the constitutive configuration parameters of the air source heat pump, the theoretical evaporation temperature, the theoretical condensation temperature and the actual exhaust superheat are calculated and determined; thereafter, the temperature deviation between the compressor exhaust temperature and the exhaust alarm limit temperature is calculated; when the temperature deviation is greater than or equal to the set temperature deviation threshold, the target exhaust superheat is calculated and determined, and the exhaust superheat of the expansion valve is controlled; when the expansion valve is controlled, the constitutive configuration parameters of the air source heat pump are taken into account, the control accuracy of the expansion valve is improved, the system oscillation is prevented, and the safe and efficient operation of the unit is ensured.

[0044] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0046] Figure 1 This is a flow chart of the expansion valve control method considering the constitutive configuration of an air source heat pump disclosed in an embodiment. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] Example 1

[0051] During the operation of the air source heat pump system, the exhaust pressure is usually high, and the exhaust superheat is relatively large relative to the suction superheat. Controlling the expansion valve opening by exhaust superheat can reduce the requirements for measurement point accuracy and control difficulty, thereby improving the system operation performance. However, in the related technologies, when controlling the exhaust superheat of the expansion valve, the influence of the constitutive configuration parameters of the air source heat pump is not considered, resulting in low control accuracy of the expansion valve.

[0052] In order to improve the control accuracy of the expansion valve, in this embodiment, an expansion valve control method considering the constitutive configuration of the air source heat pump is disclosed, such as Figure 1 As shown, including:

[0053] S1: Obtain the ambient temperature, the inlet and outlet water temperatures and water mass flow rate on the condensing side, as well as the compressor frequency, exhaust temperature and exhaust pressure.

[0054] In this embodiment, the ambient temperature T of the air source heat pump is obtained in real time. a , the condensing side water inlet temperature t1, water outlet temperature t2 and water mass flow m, as well as the compressor frequency n, exhaust temperature T out and exhaust pressure P con , to regulate the expansion valve.

[0055] S2: Based on the acquired data and the constitutive configuration parameters of the air source heat pump, the theoretical evaporation temperature and the theoretical condensation temperature are calculated according to the theoretical evaporation temperature model and the theoretical condensation temperature model; the actual condensation temperature is calculated according to the compressor exhaust pressure and the refrigerant physical properties, and the actual exhaust superheat is calculated according to the actual condensation temperature.

[0056] Among them, the constitutive configuration parameters of the air source heat pump include the outdoor heat exchange area F on the evaporation side e , F e Available: 0~1500m 2 , rated air volume of outdoor fan G, G can be 0~200m 3 / s, compressor stroke volume V o , V o It can be found through the compressor sample, V o 0~0.3m 3 / rev, condensation side heat transfer coefficient K, K can be 0~2000W / (m 2 K) and the heat exchange area F on the condensing side c , F c Available: 0~1500m 2 .

[0057] In this embodiment, the ambient temperature T a , compressor frequency n and the outdoor fan rated air volume G, evaporation side outdoor heat exchange area F in the air source heat pump constitutive configuration parameterse , compressor stroke volume V o and theoretical evaporation temperature model, calculate and determine the theoretical evaporation temperature T e , where the theoretical evaporation temperature model is derived based on the ASHP frost inhibition semi-empirical model. The theoretical evaporation temperature model is:

[0058]

[0059] Where, T a is the ambient temperature, n is the compressor frequency, G is the rated air volume of the outdoor fan, F e is the outdoor heat exchange area on the evaporation side, V o is the compressor stroke volume, T e is the theoretical evaporation temperature, and α is the correction coefficient, which is generally determined through experiments.

[0060] According to the mass flow rate m of the water on the condensing side, the inlet water temperature t1 and the outlet water temperature t2 on the condensing side, the heat exchange area F on the condensing side in the constitutive configuration parameters of the air source heat pump c The theoretical condensation temperature T is calculated by using the heat exchange coefficient K on the condensation side and the theoretical condensation temperature model. c The theoretical condensation temperature model is derived based on the logarithmic heat transfer temperature difference formula on the condensation side. The theoretical condensation temperature model is:

[0061]

[0062] Where m is the mass flow rate of water on the condensing side, t1 and t2 are the inlet and outlet water temperatures on the condensing side, and F c is the heat exchange area on the condensation side, K is the heat exchange coefficient on the condensation side, T c is the theoretical condensation temperature, β is the correction coefficient, which is generally determined by experiments; c is the specific heat capacity of water, which is 4.2×10 3 J / (kg·K).

[0063] Actual exhaust superheat T dsh Equal to the compressor exhaust temperature T out Subtract the actual condensation temperature T c，actual ; Actual condensation temperature T c，actual According to the compressor exhaust pressure P con OK, specifically:

[0064] T c，actual It is equal to the saturation temperature corresponding to the exhaust pressure of the refrigerant compressor, and is calculated based on the compressor exhaust pressure and the refrigerant physical properties.

[0065] T dsh =T out -T c，actual。

[0066] S3: Calculate the temperature deviation between the compressor exhaust temperature and the exhaust alarm limit temperature.

[0067] Temperature deviation = T out_max -T out .

[0068] Among them, T out_max Limit temperature for exhaust alarm.

[0069] S4: When the temperature deviation is greater than or equal to the set temperature deviation threshold, the target exhaust superheat is calculated and determined according to the compressor frequency, theoretical evaporation temperature and theoretical condensation temperature and the target exhaust superheat calculation model; wherein the target exhaust superheat calculation model is fitted by the compressor sample data, and the compressor sample data includes the existing theoretical evaporation temperature, compressor frequency, theoretical condensation temperature and the corresponding target exhaust superheat.

[0070] That is, when T out_max -T out When ≥a, the target exhaust superheat T is calculated based on the target exhaust superheat calculation model. set_dsh , where the target exhaust superheat calculation model is:

[0071] T set_dsh =

[0072] (18.228-0.081829n—0.0049469T e +0.090717T c +0.0013215n 2 +0.029106T e 2 +0.0085057T c 2 +0.0013556nT e -0.0028757nT c -0.027437T e T c )×γ _1 Where, T set_dsh is the target exhaust superheat, T e is the theoretical evaporation temperature, T c is the theoretical condensing temperature, n is the compressor frequency, γ _1 is the correction coefficient, which is determined by experiments; a is the set temperature deviation threshold, which can generally be 0 to 10°C.

[0073] When the temperature deviation is less than the set temperature deviation threshold, that is, T out_max -T out When <a, according to the target exhaust temperature T set_out Perform PID control on the expansion valve.

[0074] Among them, the target exhaust temperature is a preset value and can be changed according to actual needs.

[0075] S5: According to the target exhaust superheat and the actual exhaust superheat, the expansion valve is controlled to control the exhaust superheat.

[0076] The process of controlling the exhaust superheat of the expansion valve according to the target exhaust superheat and the actual exhaust superheat includes:

[0077] Calculate the superheat error between the actual exhaust superheat and the target exhaust superheat, superheat error = |T dsh -T set_dsh ∣;

[0078] When the superheat error is greater than the set superheat error threshold b, that is, |T dsh -T set_dsh ∣>b, according to the target exhaust superheat T set_dsh PID control of the expansion valve;

[0079] When the superheat error is less than or equal to the set superheat error threshold b, that is, |T dsh -T set_dsh When ∣≤b, the expansion valve is not adjusted and the unit continues to operate smoothly.

[0080] Among them, b can generally be 0~10℃.

[0081] In addition, according to the target exhaust temperature T set_out Control the expansion valve or adjust the exhaust gas superheat according to the target exhaust gas superheat T set_dsh When controlling the expansion valve, PID is used to control the expansion valve to further improve the control accuracy.

[0082] Taking the refrigerant R410A as an example, the expansion valve control method considering the constitutive configuration of the air source heat pump disclosed in this embodiment is described in detail.

[0083] First determine the outdoor heat exchange area F on the evaporation side e 169m 2 The rated air volume G of the outdoor fan is 0.844m 3 / s, compressor stroke volume V o 1.1×10 -4 m 3 / rev, the heat transfer coefficient K on the condensation side is 1300w / (m 2 ·K), condensation side heat exchange area F c 16.8m 2 , exhaust alarm limit temperature T out_max The target exhaust temperature is 115°C and T set_outis 110℃.

[0084] Monitor the ambient temperature T a The compressor exhaust temperature is -12℃. out is 103.92℃, the compressor exhaust pressure P con It is 2501kPa, the inlet water temperature t1 on the condensing side is 35.26℃, the outlet water temperature t2 on the condensing side is 40.72℃, the compressor frequency n is 100Hz, and the mass flow rate m of water on the condensing side is 2.05m / s.

[0085] According to the formula Calculate the theoretical evaporation temperature T e is -18.65℃, the theoretical condensation temperature T c is 40.96°C, where α is 0.6, β is 1.1, and c is the specific heat of water, which is 4.2×10 3 J / (kg·K).

[0086] Calculate and determine the actual condensing temperature T based on the compressor exhaust pressure c，actual =43℃, and according to T dsh =T out -T c，actual , real-time calculation of actual exhaust superheat T dsh It is 60.88℃.

[0087] a is 5℃, then T out_max -T out =11.07℃≥a, according to model T set_dsh =(18.228-0.081829n—0.0049469T e +0.090717T c +0.0013215n 2 +0.029106T e 2 +0.0085057T c 2 +0.0013556nT e -0.0028757nT c -0.027437T e T c )×γ _1 , γ _1 Take 1 and calculate the target exhaust superheat T set_dsh It is 60.25℃.

[0088] Further calculation |T dsh -T set_dsh ∣=1.62, b is 2℃, we can know that ∣T dsh -T set_dsh∣≤b, the expansion valve is not adjusted and the unit continues to operate smoothly.

[0089] If |T dsh -T set_dsh ∣>b, according to the target exhaust superheat T set_dsh Control the expansion valve; if T out_max -T out <a, according to the target exhaust temperature T set_out Control the expansion valve.

[0090] The expansion valve control method that takes into account the constitutive configuration of the air source heat pump disclosed in this embodiment comprehensively considers the influence of multi-dimensional parameters such as the constitutive configuration parameters of the air source heat pump, the compressor frequency, the ambient temperature and the water supply temperature when calculating the theoretical evaporation temperature and the theoretical condensation temperature, and has high calculation accuracy; when the accurate theoretical evaporation temperature and the theoretical condensation temperature are used to calculate the target exhaust superheat, and then the exhaust superheat of the expansion valve is controlled according to the target exhaust superheat, the accuracy of the exhaust superheat control of the expansion valve is improved.

[0091] In addition, the exhaust superheat control adopted in this embodiment can effectively avoid the problems of system oscillation and excessive exhaust temperature caused by insufficient pressure sensor accuracy in low temperature environment, improve control accuracy, ensure safe and efficient operation of the system, and has strong applicability.

[0092] Example 2

[0093] In this embodiment, an expansion valve control system considering the constitutive configuration of an air source heat pump is disclosed, including:

[0094] A data acquisition module is used to obtain the ambient temperature, the inlet and outlet water temperatures and the water mass flow rate on the condensing side, as well as the compressor frequency, exhaust temperature and exhaust pressure;

[0095] Theoretical temperature and actual exhaust superheat calculation module is used to calculate the theoretical evaporation temperature and theoretical condensation temperature according to the acquired data and the constitutive configuration parameters of the air source heat pump, according to the theoretical evaporation temperature model and the theoretical condensation temperature model; calculate the actual condensation temperature according to the compressor exhaust pressure and refrigerant physical parameters, and calculate the actual exhaust superheat according to the actual condensation temperature;

[0096] A temperature deviation calculation module is used to calculate the temperature deviation between the compressor exhaust temperature and the exhaust alarm limit temperature;

[0097] The target exhaust superheat calculation module is used to calculate and determine the target exhaust superheat according to the compressor frequency, theoretical evaporation temperature and theoretical condensation temperature according to the target exhaust superheat calculation model when the temperature deviation is greater than or equal to the set temperature deviation threshold; wherein the target exhaust superheat calculation model is fitted by the compressor sample data, and the compressor sample data includes the existing theoretical evaporation temperature, compressor frequency, theoretical condensation temperature and the corresponding target exhaust superheat;

[0098] The expansion valve control module is used to control the exhaust superheat of the expansion valve according to the target exhaust superheat and the actual exhaust superheat.

[0099] The present invention also discloses a computer device, which includes:

[0100] a processor adapted to execute a computer program;

[0101] A computer-readable storage medium having a computer program stored therein, wherein when the computer program is executed by the processor, the expansion valve control method considering the constitutive configuration of the air source heat pump disclosed in Example 1 is implemented.

[0102] The present invention also discloses a computer-readable storage medium storing a computer program, wherein the computer program is suitable for being loaded by a processor and executing the expansion valve control method considering the constitutive configuration of an air source heat pump disclosed in Example 1.

[0103] The present invention also discloses a computer program product, which includes a computer program. When the computer program is executed by a processor, the expansion valve control method considering the constitutive configuration of the air source heat pump disclosed in Example 1 is implemented.

[0104] The method disclosed in Example 1 can be directly embodied as a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

[0105] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0106] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. An expansion valve control method considering the constitutive configuration of an air source heat pump, characterized in that: include: Obtain the ambient temperature, the inlet and outlet water temperatures and water mass flow rate on the condensing side, as well as the compressor frequency, exhaust temperature and exhaust pressure; According to the acquired data and the constitutive configuration parameters of the air source heat pump, the theoretical evaporation temperature and the theoretical condensation temperature are calculated according to the theoretical evaporation temperature model and the theoretical condensation temperature model; Calculate the actual condensing temperature based on the compressor exhaust pressure and refrigerant physical parameters, and calculate the actual exhaust superheat based on the actual condensing temperature; Calculate the temperature deviation between the compressor exhaust temperature and the exhaust alarm limit temperature; When the temperature deviation is greater than or equal to the set temperature deviation threshold, the target exhaust superheat is calculated and determined according to the compressor frequency, theoretical evaporation temperature and theoretical condensation temperature and the target exhaust superheat calculation model; wherein the target exhaust superheat calculation model is fitted by the compressor sample data, and the compressor sample data includes the existing theoretical evaporation temperature, compressor frequency, theoretical condensation temperature and the corresponding target exhaust superheat; The exhaust superheat is controlled on the expansion valve according to the target exhaust superheat and the actual exhaust superheat.

2. The expansion valve control method considering the constitutive configuration of an air source heat pump according to claim 1, characterized in that: The process of controlling the exhaust superheat of the expansion valve according to the target exhaust superheat and the actual exhaust superheat includes: Calculating the superheat error between the actual exhaust superheat and the target exhaust superheat; When the superheat error is greater than the set superheat error threshold, the expansion valve is PID controlled according to the target exhaust superheat; when the superheat error is less than or equal to the set superheat error threshold, the system continues to operate smoothly.

3. The expansion valve control method considering the constitutive configuration of an air source heat pump according to claim 1, characterized in that: When the temperature deviation is less than the set temperature deviation threshold, the expansion valve is PID controlled according to the target exhaust temperature.

4. The expansion valve control method considering the constitutive configuration of an air source heat pump according to claim 1, characterized in that: The target exhaust superheat calculation model is: T set_dsh ＝ (18.228-0.081829n—0.0049469T e +0.090717T c +0.0013215n 2 +0.029106T e 2 +0.0085057T c 2 +0.0013556nT e -0.0028757nT c -0.027437T e T c )×γ _1 Where, T set_dsh is the target exhaust superheat, T e is the theoretical evaporation temperature, T c is the theoretical condensing temperature, n is the compressor frequency, γ _1 is the correction factor.

5. The expansion valve control method considering the constitutive configuration of an air source heat pump according to claim 1, characterized in that: The theoretical evaporation temperature model is: Where, T a is the ambient temperature, n is the compressor frequency, G is the rated air volume of the outdoor fan, F e is the outdoor heat exchange area on the evaporation side, V o is the compressor stroke volume, T e is the theoretical evaporation temperature, α is the correction coefficient; The theoretical condensation temperature model is: Where m is the mass flow rate of water on the condensing side, t1 and t2 are the inlet and outlet water temperatures on the condensing side, and F c is the heat exchange area on the condensation side, K is the heat exchange coefficient on the condensation side, T c is the theoretical condensation temperature, β is the correction coefficient; c is the specific heat capacity of water.

6. The expansion valve control method considering the constitutive configuration of an air source heat pump according to claim 1, characterized in that: The actual discharge superheat is equal to the compressor discharge temperature minus the actual condensing temperature.

7. An expansion valve control system considering the constitutive configuration of an air source heat pump, characterized in that: include: A data acquisition module is used to obtain the ambient temperature, the inlet and outlet water temperatures and the water mass flow rate on the condensing side, as well as the compressor frequency, exhaust temperature and exhaust pressure; Theoretical temperature and actual exhaust superheat calculation module is used to calculate the theoretical evaporation temperature and theoretical condensation temperature according to the acquired data and the constitutive configuration parameters of the air source heat pump, according to the theoretical evaporation temperature model and the theoretical condensation temperature model; calculate the actual condensation temperature according to the compressor exhaust pressure and refrigerant physical parameters, and calculate the actual exhaust superheat according to the actual condensation temperature; A temperature deviation calculation module is used to calculate the temperature deviation between the compressor exhaust temperature and the exhaust alarm limit temperature; The target exhaust superheat calculation module is used to calculate and determine the target exhaust superheat according to the compressor frequency, theoretical evaporation temperature and theoretical condensation temperature according to the target exhaust superheat calculation model when the temperature deviation is greater than or equal to the set temperature deviation threshold; wherein the target exhaust superheat calculation model is fitted by the compressor sample data, and the compressor sample data includes the existing theoretical evaporation temperature, compressor frequency, theoretical condensation temperature and the corresponding target exhaust superheat; The expansion valve control module is used to control the exhaust superheat of the expansion valve according to the target exhaust superheat and the actual exhaust superheat.

8. An electronic device, characterized in that: The device comprises: a processor adapted to execute a computer program; A computer-readable storage medium having a computer program stored therein, wherein when the computer program is executed by the processor, the expansion valve control method considering the constitutive configuration of the air source heat pump as described in any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor and executing the expansion valve control method considering the constitutive configuration of an air source heat pump as described in any one of claims 1-6.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the expansion valve control method considering the constitutive configuration of the air source heat pump as described in any one of claims 1 to 6 is implemented.

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