Heat pump unit and control method thereof

Abstract

The present invention relates to the technical field of heat pump units, and specifically discloses a heat pump unit and a control method thereof. The method comprises: evaluating the environmental humidity and heat anomaly and the environmental load level of the heat pump unit, analyzing the system pressure and refrigerant flow of the heat pump unit, and obtaining the inverter frequency adjustment index of the heat pump unit through comprehensive analysis according to the environmental interference value and the evaluation value of the heat pump unit operation anomaly. The method adjusts the compressor frequency according to the compressor demand frequency of the heat pump unit, so that the heat pump unit can maintain a high energy efficiency ratio throughout the entire operation cycle, reduce energy consumption, and automatically adjust the operation state according to the changes in the external environmental temperature, humidity and user needs through an intelligent control algorithm to ensure the efficient operation of the heat pump unit, and can also reduce equipment loss caused by incorrect operation or improper setting, extend the service life of the equipment, and reduce maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump units, in particular to a heat pump unit and a control method thereof. Background Art

[0002] At present, people have higher and higher requirements for the comfort of living and working environment. Heat pump units can provide precise temperature and humidity control to meet the comfort needs and are widely used. With the intensification of the energy crisis and the improvement of environmental awareness, society has higher and higher demands for energy conservation and emission reduction, which requires heat pump units to have a higher energy efficiency ratio. Therefore, it is necessary to provide heat pump units and control methods thereof, so that the heat pump units can effectively reduce energy consumption and meet energy-saving needs, while ensuring that the heat pump units can operate stably for a long time and improve the reliability of the system.

[0003] For example, the invention patent with announcement number: CN104896797B discloses a heat pump unit and a control method for the heat pump unit. The heat pump unit includes an outdoor unit, a communication bus and multiple wire controllers. The outdoor unit is connected to the communication bus, and the multiple wire controllers are respectively connected to the communication bus. The control method includes the following steps: after any one of the multiple wire controllers receives a control instruction input by the user, the control instruction is sent to the communication bus; the communication bus forwards the control instruction to the outdoor unit; it is determined whether the outdoor unit matches the control instruction; if it is determined that the control instruction is matched, the outdoor unit executes the control instruction and generates operating status information, so that the heat pump unit can be controlled by multiple wire controllers, thereby improving the convenience of project installation and user satisfaction, and multiple wire controllers can share and synchronize data during the control process.

[0004] Based on the above solution, it is found that there are still some shortcomings in the heat pump unit, which are specifically reflected in the following aspects: (1) The current heat pump unit cannot automatically adjust the operating status in real time according to environmental changes, and cannot ensure the efficient operation of the heat pump unit.

[0005] (2) The current heat pump units cannot be precisely controlled to maintain a high energy efficiency ratio throughout the entire operating cycle, which is not conducive to reducing energy consumption and cannot effectively save energy and reduce emissions. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a heat pump unit and a control method thereof, which can effectively solve the problems involved in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: The first aspect of the present invention provides a heat pump unit control method, including: collecting working environment data of the heat pump unit, evaluating the environmental humidity and heat anomaly and the environmental load level of the heat pump unit, and obtaining the environmental interference value of the heat pump unit after processing.

[0008] The working status and operation data of the heat pump unit are collected, the system pressure and energy consumption efficiency of the heat pump unit are analyzed, and the abnormal operation evaluation value of the heat pump unit is obtained after processing.

[0009] According to the environmental interference value and the abnormal operation evaluation value of the heat pump unit, the inverter frequency adjustment index of the heat pump unit is obtained through comprehensive analysis, and the compressor frequency of the heat pump unit is adjusted and controlled according to the inverter frequency adjustment index of the heat pump unit.

[0010] As a further method, the environmental humidity and heat anomaly and environmental load level of the heat pump unit are evaluated. The specific analysis process is: deploy a number of environmental monitoring points in the working area of ​​the heat pump unit, collect the indoor temperature, outdoor temperature and outdoor humidity of each environmental monitoring point in the working area of ​​the heat pump unit, and comprehensively analyze to obtain the environmental humidity and heat anomaly value of the heat pump unit. The specific numerical expression is:

[0011]

[0012] Where Y H represents the abnormal humidity and heat value of the heat pump unit, t represents the number of each environmental monitoring point, t=1,2,3,...,d, d represents the total number of environmental monitoring points, e represents the natural constant, Q t Indicates the temperature difference between indoor and outdoor environment in the working area of ​​the heat pump unit, Q t =|C N→t -C W→t |, C N→t represents the outdoor temperature of the tth environmental monitoring point, C W→t represents the indoor temperature of the tth environmental monitoring point, Q 0 Indicates the preset critical temperature difference of the heat pump unit. Indicates the preset outdoor temperature setting value, S N→t represents the outdoor humidity at the tth environmental monitoring point, Indicates the preset reference suitable outdoor humidity, ΔC N Indicates the set allowable deviation of outdoor temperature, ΔS N It represents the set allowable deviation of outdoor humidity, ε1 represents the abnormal influence factor of environmental humidity and heat corresponding to the set temperature difference, ε2 represents the abnormal influence factor of environmental humidity and heat corresponding to the set outdoor temperature, and ε3 represents the abnormal influence factor of environmental humidity and heat corresponding to the set outdoor humidity.

[0013] As a further method, the evaluation of the environmental humidity and heat anomaly and the environmental bearing degree of the heat pump unit also includes: collecting the solar irradiance of each environmental monitoring point in the working area of ​​the heat pump unit, and obtaining the current number of people indoors in the working area of ​​the heat pump unit, and analyzing the indoor working environmental bearing capacity of the heat pump unit by a linear regression method to obtain the environmental bearing capacity index of the heat pump unit, and obtaining the critical indoor number of people according to the matching of the environmental bearing capacity index of the heat pump unit, and comprehensively analyzing to obtain the environmental bearing degree index of the heat pump unit, and the specific numerical expression is:

[0014]

[0015] Where Y F represents the environmental load index of the heat pump unit, R represents the current number of people in the working area of ​​the heat pump unit, and R 0 represents the critical number of people in the room, K t represents the solar irradiance at the tth environmental monitoring point, K 0 represents the preset reference suitable solar irradiance, ΔK represents the set allowable deviation solar irradiance, ε4 represents the environmental carrying capacity influence factor corresponding to the set number of indoor people, and ε5 represents the environmental carrying capacity influence factor corresponding to the set solar irradiance.

[0016] As a further method, the environmental interference value of the heat pump unit is obtained through processing, and the specific process is: according to the environmental humidity and heat abnormal value and the environmental bearing degree index of the heat pump unit, the environmental interference value of the heat pump unit is obtained through comprehensive analysis.

[0017] As a further method, the system pressure and refrigerant flow of the heat pump unit are analyzed. The specific analysis process is: the operation data of the heat pump unit is monitored to obtain the high-pressure side pressure and the low-pressure side pressure of the heat pump unit, and the system pressure abnormality value of the heat pump unit is obtained by comprehensive analysis. The specific numerical expression is:

[0018]

[0019] Where P X Indicates the abnormal degree of system pressure of the heat pump unit, α indicates the high-pressure side pressure of the heat pump unit, α 0 represents the preset critical high-pressure side pressure, β represents the low-pressure side pressure of the heat pump unit, and β 0 represents the preset critical low-pressure side pressure, σ1 represents the system pressure abnormality influence factor corresponding to the set high-pressure side pressure, and σ2 represents the system pressure influence factor corresponding to the set low-pressure side pressure.

[0020] As a further method, the heat pump unit operation abnormality evaluation value is obtained through processing, and the specific analysis process is: the operation data of the heat pump unit is monitored to obtain the refrigerant flow of the heat pump unit, and the heat pump unit operation abnormality evaluation value is comprehensively analyzed according to the system pressure abnormality value of the heat pump unit and the refrigerant flow of the heat pump unit. The specific numerical expression is:

[0021]

[0022] Where θ represents the abnormal operation evaluation value of the heat pump unit, P X Indicates the abnormal degree of system pressure of the heat pump unit, P Z It represents the refrigerant flow rate of the heat pump unit, δ1 represents the operation abnormality impact factor corresponding to the set system pressure, and δ2 represents the operation abnormality impact factor corresponding to the set refrigerant flow unit value.

[0023] As a further method, the compressor frequency of the heat pump unit is adjusted and controlled according to the inverter frequency adjustment index of the heat pump unit. The specific analysis process is: according to the environmental interference value of the heat pump unit and the abnormal operation evaluation value of the heat pump unit, the inverter frequency adjustment index of the heat pump unit is comprehensively analyzed to obtain the inverter frequency adjustment index of the heat pump unit, the inverter frequency adjustment index of the heat pump unit is matched with the compressor demand frequency corresponding to each inverter frequency adjustment index interval stored in the heat pump unit database to obtain the compressor demand frequency of the heat pump unit, and the compressor frequency is adjusted according to the compressor demand frequency of the heat pump unit.

[0024] As a further method, the environmental interference value of the heat pump unit is specifically expressed as:

[0025]

[0026] In the formula, μ represents the environmental interference value of the heat pump unit, Y H Indicates the abnormal humidity and heat value of the heat pump unit, Y F It represents the environmental bearing index of the heat pump unit, ρ1 represents the environmental interference value impact factor corresponding to the environmental humidity and heat abnormality value, and ρ2 represents the environmental interference value impact factor corresponding to the environmental bearing index.

[0027] As a further method, the inverter frequency adjustment index of the heat pump unit is expressed as follows:

[0028]

[0029] In the formula, represents the inverter frequency regulation index of the heat pump unit, θ represents the abnormal operation evaluation value of the heat pump unit, μ represents the environmental interference value of the heat pump unit, ω1 represents the inverter frequency regulation index influence factor of the heat pump unit corresponding to the set abnormal operation evaluation value of the heat pump unit, and ω2 represents the inverter frequency regulation index influence factor of the heat pump unit corresponding to the set environmental interference value of the heat pump unit.

[0030] The second aspect of the present invention provides a heat pump unit, characterized in that it includes: a frequency converter, which is an actuator of the heat pump unit control structure, used to receive sensor data and adjust the operating speed of the compressor according to the sensor data to adapt to indoor temperature requirements and energy efficiency requirements.

[0031] The environmental sensor is used to collect environmental parameters of the working area of ​​the heat pump unit.

[0032] A pressure sensor is used to collect system pressure data during the operation of the heat pump unit.

[0033] A refrigerant flow sensor is used to collect the refrigerant flow during the operation of the heat pump unit.

[0034] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0035] (1) The present invention provides a heat pump unit and a control method thereof. Through precise control, the heat pump unit can maintain a high energy efficiency ratio throughout the entire operating cycle, thereby effectively reducing energy consumption. It can also automatically adjust the operating state, reduce equipment losses caused by incorrect operation or improper settings, extend the service life of the equipment, and reduce maintenance costs.

[0036] (2) The present invention can automatically adjust the operating state according to changes in external environmental temperature, humidity and user needs through an intelligent control algorithm to ensure efficient operation of the heat pump unit.

[0037] (3) The present invention can ensure that the system operates within a safe pressure range by monitoring the system pressure, thereby avoiding unsafe factors caused by excessively high or low pressure. It can also ensure that the system operates stably within the design parameters, thereby improving system reliability.

[0038] (4) The present invention can ensure the stability and suitability of the refrigerant flow rate by monitoring the refrigerant flow rate, reduce wear on the system, extend the service life of the equipment, and improve the energy efficiency ratio of the heat pump, thereby achieving energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0040] Figure 1 It is a schematic diagram of the method flow of the present invention. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] Reference Figure 1 As shown, the present invention provides a heat pump unit control method, including: collecting working environment data of the heat pump unit, evaluating the environmental humidity and heat anomaly and environmental load level of the heat pump unit, and obtaining the environmental interference value of the heat pump unit through processing.

[0043] Specifically, the environmental humidity and heat anomaly and environmental load level of the heat pump unit are evaluated. The specific analysis process is: deploy a number of environmental monitoring points in the working area of ​​the heat pump unit, collect the indoor temperature, outdoor temperature and outdoor humidity of each environmental monitoring point in the working area of ​​the heat pump unit, and comprehensively analyze to obtain the environmental humidity and heat anomaly value of the heat pump unit. In addition to being obtained through manual detection, the environmental humidity and heat anomaly value of the heat pump unit can also be obtained by analyzing the environmental data monitored by the meteorological station, and can also be calculated by the formula. The specific numerical expression is:

[0044]

[0045] Where Y H represents the abnormal humidity and heat value of the heat pump unit, t represents the number of each environmental monitoring point, t=1,2,3,...,d, d represents the total number of environmental monitoring points, e represents the natural constant, Q t Indicates the temperature difference between indoor and outdoor environment in the working area of ​​the heat pump unit, Q t =|C N→t -C W→t |, C N→t represents the outdoor temperature of the tth environmental monitoring point, C W→t represents the indoor temperature of the tth environmental monitoring point, Q 0 Indicates the preset critical temperature difference of the heat pump unit. Indicates the preset outdoor temperature setting value, S N→t represents the outdoor humidity at the tth environmental monitoring point, Indicates the preset reference suitable outdoor humidity, ΔC N Indicates the set allowable deviation of outdoor temperature, ΔS N It represents the set allowable deviation of outdoor humidity, ε1 represents the abnormal influence factor of environmental humidity and heat corresponding to the set temperature difference, ε2 represents the abnormal influence factor of environmental humidity and heat corresponding to the set outdoor temperature, and ε3 represents the abnormal influence factor of environmental humidity and heat corresponding to the set outdoor humidity.

[0046] In a specific embodiment, the indoor temperature, outdoor temperature and outdoor humidity of each environmental monitoring point in the working area of ​​the heat pump unit are obtained by analyzing the temperature and humidity data of the working area of ​​the heat pump unit monitored by the installed temperature sensor and humidity sensor. The outdoor temperature has a great influence on the working performance of the heat pump unit because the heat pump unit exchanges heat with the external environment through the outdoor heat exchanger. When the outdoor temperature is low, the working performance of the heat pump unit usually decreases because the low temperature environment reduces the evaporation temperature of the refrigerant, thereby reducing the COP. The higher the outdoor temperature, the better the working performance of the heat pump unit is usually because the evaporation temperature is higher and the COP will increase accordingly. Outdoor humidity can affect the working efficiency of the heat pump unit, especially in cooling mode. A high humidity environment can make it difficult to reduce indoor humidity, requiring the heat pump unit to consume more energy to dehumidify. When the outdoor humidity is high, the surface of the heat exchanger is prone to frost, which can reduce the heat exchange efficiency of the heat pump, increase energy consumption, and may require the heat pump unit to perform defrosting operations.

[0047] It should be explained that the environmental humidity and heat abnormality value of the heat pump unit in this embodiment is a quantitative evaluation data obtained by comprehensively analyzing the indoor temperature, outdoor temperature and outdoor humidity at each environmental monitoring point in the working area of ​​the heat pump unit. It is used to quantitatively evaluate the environmental humidity and heat abnormality of the heat pump unit and provide a basis for evaluating the environmental interference value of the working area of ​​the heat pump unit.

[0048] Furthermore, the solar irradiance of each environmental monitoring point in the working area of ​​the heat pump unit is collected, and the current number of people indoors in the working area of ​​the heat pump unit is obtained. The carrying capacity of the indoor working environment of the heat pump unit is analyzed by the linear regression method to obtain the environmental carrying capacity index of the heat pump unit. The critical number of people indoors is obtained according to the matching of the environmental carrying capacity index of the heat pump unit. The environmental carrying degree index of the heat pump unit is obtained by comprehensive analysis. The environmental carrying degree index of the heat pump unit can be obtained not only by using computer models and simulation software to predict the environmental impact of the heat pump unit, but also by life cycle assessment methods, and can also be calculated by formulas. The specific numerical expression is:

[0049]

[0050] Where Y Frepresents the environmental load index of the heat pump unit, R represents the current number of people in the working area of ​​the heat pump unit, and R 0 represents the critical number of people in the room, K t represents the solar irradiance at the tth environmental monitoring point, K 0 represents the preset reference suitable solar irradiance, ΔK represents the set allowable deviation solar irradiance, ε4 represents the environmental carrying capacity influence factor corresponding to the set number of indoor people, and ε5 represents the environmental carrying capacity influence factor corresponding to the set solar irradiance.

[0051] In a specific embodiment, the solar irradiance at each environmental monitoring point is obtained by real-time or periodic recording of solar irradiance data analysis by a solar irradiance meter installed in the working area. Solar irradiance directly affects the amount of heat absorbed by the heat pump unit from the environment. In a solar-assisted heat pump system, the level of solar irradiance determines the contribution ratio of solar heat in the solar heat pump system. The higher the solar irradiance and the lower the ambient temperature, the more heat the heat pump unit absorbs from the environment, and the higher the efficiency of the system. The higher the solar irradiance, the more free solar energy the heat pump unit can utilize during operation, thereby reducing energy consumption and operating costs. At the same time, the volatility of solar irradiance may also affect the stability of the system, and it is necessary to balance supply and demand through energy storage and other means.

[0052] In a specific embodiment, an increase in the number of people indoors will lead to an increase in indoor heat load. Human heat dissipation, equipment use, and daily activities will generate heat, which will increase the indoor temperature, thereby increasing the amount of cooling or heat that the heat pump unit needs to provide. An increase in the number of people indoors will also lead to an increase in the demand for fresh air. In order to ensure the indoor air quality, fresh air needs to be replenished regularly, which will change the indoor and outdoor temperature difference and humidity, affecting the working mode and energy consumption of the heat pump unit. The work and rest time of the number of people indoors will affect the running time of the heat pump unit. For example, when there are more people during the day, the heat pump unit needs to provide more cooling or heating services, and when the number of people decreases at night, the heat pump unit can reduce the running time accordingly to save energy. The number of people indoors will also affect the energy efficiency ratio (COP) of the heat pump unit. During peak usage periods, the heat pump unit needs to bear a greater load, which may cause the COP to decrease. During non-peak periods, due to the smaller load, the COP of the heat pump unit may be higher. When designing a heat pump system, it is necessary to consider the potential impact of the number of people indoors on the heat load. The design capacity and energy efficiency ratio of the system need to be determined based on the expected maximum load to ensure that the system can meet the energy demand during the busiest periods. Changes in the number of people in a room may require adjustments to the heat pump unit control system. For example, intelligent control can automatically adjust the operating mode and energy consumption according to the indoor and outdoor temperature difference, humidity, and the number of people in the room to achieve optimal use of energy.

[0053] It should be explained that the environmental carrying capacity index of the heat pump unit in this embodiment is a quantitative evaluation data obtained by comprehensively analyzing the solar irradiance at each environmental monitoring point in the working area of ​​the heat pump unit and the current number of people indoors in the working area of ​​the heat pump unit. It is used to quantitatively evaluate the environmental carrying capacity of the heat pump unit and provide a basis for evaluating the environmental interference value of the working area of ​​the heat pump unit.

[0054] Specifically, the environmental interference value of the heat pump unit is obtained through processing. The specific process is: according to the environmental humidity and heat anomaly value and the environmental bearing index of the heat pump unit, the environmental interference value of the heat pump unit is obtained by comprehensive analysis. The environmental interference value of the heat pump unit can not only be obtained by simulating the energy consumption and performance of the environment where the heat pump unit is located using building simulation software, but also by obtaining local historical meteorological data from the meteorological department, including temperature, humidity, wind speed, precipitation, etc., to evaluate the impact of the environment on the heat pump unit. It can also be calculated by formula, and the specific numerical expression is:

[0055]

[0056] In the formula, μ represents the environmental interference value of the heat pump unit, Y H Indicates the abnormal humidity and heat value of the heat pump unit, Y F It represents the environmental bearing index of the heat pump unit, ρ1 represents the environmental interference value impact factor corresponding to the environmental humidity and heat abnormality value, and ρ2 represents the environmental interference value impact factor corresponding to the environmental bearing index.

[0057] In a specific embodiment, the present invention can automatically adjust the operating state according to changes in external environmental temperature, humidity and user needs through an intelligent control algorithm to ensure efficient operation of the heat pump unit.

[0058] It should be explained that the environmental interference value of the heat pump unit in this embodiment is a quantitative evaluation data obtained by comprehensively analyzing the environmental humidity and heat anomaly value and the environmental bearing degree index of the heat pump unit. It is used to quantitatively evaluate the environmental interference of the heat pump unit, provide a basis for the evaluation of the inverter frequency adjustment index of the heat pump unit, and is conducive to improving the energy efficiency ratio of the heat pump unit.

[0059] The working status and operation data of the heat pump unit are collected, the system pressure and refrigerant flow of the heat pump unit are analyzed, and the abnormal operation evaluation value of the heat pump unit is obtained after processing.

[0060] Specifically, the system pressure and energy efficiency of the heat pump unit are analyzed. The specific analysis process is: the operation data of the heat pump unit is monitored to obtain the high-pressure side pressure and the low-pressure side pressure of the heat pump unit, and the system pressure abnormality value of the heat pump unit is obtained by comprehensive analysis. The system pressure abnormality value of the heat pump unit can not only be obtained by displaying the corresponding fault code on the display screen, but also by analyzing the color and smell changes of the refrigerant, and judging whether the system pressure is abnormal, and can also be obtained by calculation through the formula. The specific numerical expression is:

[0061]

[0062] Where P X Indicates the abnormal degree of system pressure of the heat pump unit, α indicates the high-pressure side pressure of the heat pump unit, α 0 represents the preset critical high-pressure side pressure, β represents the low-pressure side pressure of the heat pump unit, and β 0 represents the preset critical low-pressure side pressure, σ1 represents the system pressure abnormality influence factor corresponding to the set high-pressure side pressure, and σ2 represents the system pressure influence factor corresponding to the set low-pressure side pressure.

[0063] In a specific embodiment, the present invention can ensure that the system operates within a safe pressure range by monitoring the system pressure, avoiding unsafe factors caused by excessively high or low pressure, and can also ensure that the system operates stably within the design parameters, thereby improving system reliability.

[0064] In a specific embodiment, the high-pressure side pressure and low-pressure side pressure of the heat pump unit are system pressure data obtained by real-time monitoring during the operation of the heat pump unit through the installed pressure sensor. The high-pressure side pressure directly affects the compression ratio of the refrigerant in the compressor, and then affects the refrigeration capacity. Too high pressure may cause the compression ratio of the refrigerant to exceed the design range, reducing the refrigeration efficiency. An increase in high-pressure side pressure usually means that the compressor needs to do more work to maintain the same refrigeration capacity, which will lead to increased energy consumption. Too high pressure on the high-pressure side may cause the system pressure protection device to start, and may even damage the compressor or other parts of the system. The low-pressure side pressure affects the suction state of the refrigerant in the evaporator. Too low pressure may cause the suction of the refrigerant to overheat and reduce the evaporation efficiency. The low-pressure side pressure and the high-pressure side pressure jointly determine the pressure ratio of the refrigeration cycle. Improper pressure ratio will affect the efficiency of the refrigeration cycle. Too low pressure on the low-pressure side may cause the desiccant moisture absorption capacity in the system to decrease, and even cause dew point corrosion inside the system.

[0065] It should be explained that the system pressure abnormality value of the heat pump unit in this embodiment is obtained by comprehensively analyzing the high-pressure side pressure and the low-pressure side pressure of the heat pump unit to obtain quantitative evaluation data, which is used to quantitatively evaluate the system pressure abnormality of the heat pump unit, provide a basis for evaluating the abnormal operation evaluation value of the heat pump unit, and is conducive to the normal and stable operation of the heat pump unit.

[0066] Furthermore, the heat pump unit operation abnormality evaluation value is obtained through processing. The specific analysis process is: the operation data of the heat pump unit is monitored to obtain the refrigerant flow of the heat pump unit, and the heat pump unit operation abnormality evaluation value is comprehensively analyzed according to the system pressure abnormality value of the heat pump unit and the refrigerant flow of the heat pump unit. The heat pump unit operation abnormality evaluation value can be obtained not only through adaptive fault diagnosis, but also by using artificial intelligence technology to learn historical data, establish a fault diagnosis model, and realize the prediction and diagnosis of operation abnormalities. It can also be obtained by formula calculation. The specific numerical expression is:

[0067]

[0068] Where θ represents the abnormal operation evaluation value of the heat pump unit, P X Indicates the abnormal degree of system pressure of the heat pump unit, P Z It represents the refrigerant flow rate of the heat pump unit, δ1 represents the operation abnormality impact factor corresponding to the set system pressure, and δ2 represents the operation abnormality impact factor corresponding to the set refrigerant flow unit value.

[0069] In a specific embodiment, the present invention can ensure the stability and suitability of the refrigerant flow rate by monitoring the refrigerant flow rate, reduce wear on the system, extend the service life of the equipment, and improve the energy efficiency ratio of the heat pump, thereby achieving energy saving effects.

[0070] In a specific embodiment, the refrigerant flow rate of the heat pump unit is obtained by real-time monitoring of the installed refrigerant flow sensor during the operation of the heat pump unit, and the refrigerant flow rate directly affects the cooling capacity of the heat pump. Insufficient flow rate may reduce the heat exchange efficiency on the evaporator side, thereby reducing the cooling capacity; while excessive flow rate may increase the burden on the compressor, increase energy consumption, and reduce the efficiency ratio of the system. The energy efficiency ratio of the heat pump is an important indicator to measure its efficiency, which indicates the cooling capacity that can be obtained per unit energy input. Changes in refrigerant flow rate will directly affect the working state of the compressor and the heat exchange efficiency of the system, thereby affecting the energy efficiency ratio. The refrigerant flow rate is related to the pressure difference in the system. Excessive flow rate may increase the pressure difference in the system, increase the energy consumption of the pump and the pressure loss of the system; too small flow rate may not be enough to maintain the normal operation of the system. Appropriate refrigerant flow rate helps to maintain the working state of the evaporator and condenser. Insufficient flow rate may cause uneven frosting of the evaporator and reduce the heat exchange efficiency; while excessive flow rate may cause poor heat dissipation of the condenser, affecting the discharge capacity of the heat pump. Fluctuations in refrigerant flow may affect the stability of the heat pump system, causing the system to start or stop frequently, thus affecting its life and efficiency.

[0071] It should be explained that the abnormal operation evaluation value of the heat pump unit in this embodiment is a quantitative evaluation data obtained by comprehensively analyzing the abnormal degree of system pressure of the heat pump unit and the refrigerant flow of the heat pump unit. It is used to quantitatively evaluate the abnormal operation degree of the heat pump unit, provide a basis for the evaluation of the frequency adjustment index of the inverter of the heat pump unit, and is conducive to improving the efficiency of the heat pump unit.

[0072] According to the environmental interference value and the abnormal operation evaluation value of the heat pump unit, the inverter frequency adjustment index of the heat pump unit is obtained through comprehensive analysis, and the compressor frequency of the heat pump unit is adjusted and controlled according to the inverter frequency adjustment index of the heat pump unit.

[0073] Specifically, the compressor frequency of the heat pump unit is regulated and controlled according to the inverter frequency regulation index of the heat pump unit. The specific analysis process is: according to the environmental interference value of the heat pump unit and the abnormal operation evaluation value of the heat pump unit, the inverter frequency regulation index of the heat pump unit is comprehensively analyzed to obtain the inverter frequency regulation index of the heat pump unit, the inverter frequency regulation index of the heat pump unit is matched with the compressor demand frequency corresponding to each inverter frequency regulation index interval stored in the heat pump unit database to obtain the compressor demand frequency of the heat pump unit, and the compressor frequency is regulated according to the compressor demand frequency of the heat pump unit.

[0074] Furthermore, the inverter frequency regulation index of the heat pump unit can be obtained not only through simulation, but also through data analysis and intelligent control, and can also be calculated through formulas. The specific numerical expression is:

[0075]

[0076] In the formula, represents the inverter frequency regulation index of the heat pump unit, θ represents the abnormal operation evaluation value of the heat pump unit, μ represents the environmental interference value of the heat pump unit, ω1 represents the inverter frequency regulation index influence factor of the heat pump unit corresponding to the set abnormal operation evaluation value of the heat pump unit, and ω2 represents the inverter frequency regulation index influence factor of the heat pump unit corresponding to the set environmental interference value of the heat pump unit.

[0077] It should be explained that the inverter frequency regulation index of the heat pump unit in this embodiment is a quantitative evaluation data obtained by comprehensive analysis of the environmental interference value and the abnormal operation evaluation value of the heat pump unit, which is used to evaluate the inverter frequency regulation of the heat pump unit, which is beneficial to improving the efficiency of the heat pump unit and reducing energy consumption.

[0078] A second aspect of the present invention provides a heat pump unit, comprising: a frequency converter, which is an actuator of the heat pump unit control structure, and is used to receive sensor data and adjust the operating speed of the compressor according to the sensor data to meet indoor temperature requirements and energy efficiency requirements.

[0079] The environmental sensor is used to collect environmental parameters of the working area of ​​the heat pump unit.

[0080] A pressure sensor is used to collect system pressure data during the operation of the heat pump unit.

[0081] A refrigerant flow sensor is used to collect the refrigerant flow during the operation of the heat pump unit.

[0082] In a specific embodiment, the present invention provides a heat pump unit and a control method thereof. Through precise control, the heat pump unit can maintain a high energy efficiency ratio throughout the entire operating cycle, thereby effectively reducing energy consumption, and can automatically adjust the operating status, reduce equipment losses caused by incorrect operation or improper settings, extend equipment service life, and reduce maintenance costs.

[0083] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A heat pump unit control method, characterized in that: include: Collect the working environment data of the heat pump unit, evaluate the environmental humidity and heat anomaly and environmental load of the heat pump unit, and obtain the environmental interference value of the heat pump unit after processing; Collect the working status and operation data of the heat pump unit, analyze the system pressure and refrigerant flow of the heat pump unit, and obtain the abnormal operation evaluation value of the heat pump unit after processing; According to the environmental interference value and the abnormal operation evaluation value of the heat pump unit, the inverter frequency adjustment index of the heat pump unit is obtained through comprehensive analysis, and the compressor frequency of the heat pump unit is adjusted and controlled according to the inverter frequency adjustment index of the heat pump unit.

2. The heat pump unit control method according to claim 1, characterized in that: The environmental humidity and heat anomaly and environmental load level of the heat pump unit are evaluated, and the specific analysis process is as follows: Several environmental monitoring points are deployed in the working area of ​​the heat pump unit to collect the indoor temperature, outdoor temperature and outdoor humidity of each environmental monitoring point in the working area of ​​the heat pump unit. The environmental humidity and heat abnormal value of the heat pump unit is obtained through comprehensive analysis. The specific numerical expression is: Where Y H represents the abnormal humidity and heat value of the heat pump unit, t represents the number of each environmental monitoring point, t=1,2,3,...,d, d represents the total number of environmental monitoring points, e represents the natural constant, Q t Indicates the temperature difference between indoor and outdoor environment in the working area of ​​the heat pump unit, Q t =C N→t -C W→t , C N→t represents the outdoor temperature of the tth environmental monitoring point, C W→t represents the indoor temperature of the tth environmental monitoring point, Q 0 Indicates the preset critical temperature difference of the heat pump unit. Indicates the preset outdoor temperature setting value, S N→t represents the outdoor humidity at the tth environmental monitoring point, Indicates the preset reference suitable outdoor humidity, ΔC N Indicates the set allowable deviation of outdoor temperature, ΔS N It represents the set allowable deviation of outdoor humidity, ε1 represents the abnormal influence factor of environmental humidity and heat corresponding to the set temperature difference, ε2 represents the abnormal influence factor of environmental humidity and heat corresponding to the set outdoor temperature, and ε3 represents the abnormal influence factor of environmental humidity and heat corresponding to the set outdoor humidity.

3. The heat pump unit control method according to claim 1, characterized in that: The evaluation of the abnormal humidity and heat environment and the environmental load level of the heat pump unit also includes: The solar irradiance of each environmental monitoring point in the working area of ​​the heat pump unit is collected, and the current number of people indoors in the working area of ​​the heat pump unit is obtained. The carrying capacity of the indoor working environment of the heat pump unit is analyzed by the linear regression method to obtain the environmental carrying capacity index of the heat pump unit. The critical number of people indoors is obtained according to the matching of the environmental carrying capacity index of the heat pump unit. The environmental carrying degree index of the heat pump unit is obtained by comprehensive analysis. The specific numerical expression is: Where Y F represents the environmental load index of the heat pump unit, R represents the current number of people in the working area of ​​the heat pump unit, and R 0 represents the critical number of people in the room, K t represents the solar irradiance at the tth environmental monitoring point, K 0 represents the preset reference suitable solar irradiance, ΔK represents the set allowable deviation solar irradiance, ε4 represents the environmental carrying capacity influence factor corresponding to the set number of indoor people, and ε5 represents the environmental carrying capacity influence factor corresponding to the set solar irradiance.

4. The heat pump unit control method according to claim 3, characterized in that: The environmental interference value of the heat pump unit is obtained through processing, and the specific process is as follows: According to the abnormal humidity and heat environment value and the environmental bearing index of the heat pump unit, the environmental interference value of the heat pump unit is obtained through comprehensive analysis.

5. The heat pump unit control method according to claim 1, characterized in that: The system pressure and refrigerant flow of the heat pump unit are analyzed, and the specific analysis process is as follows: The operation data of the heat pump unit is monitored to obtain the high-pressure side pressure and low-pressure side pressure of the heat pump unit. The system pressure abnormality value of the heat pump unit is obtained through comprehensive analysis. The specific numerical expression is: Where P X Indicates the abnormal degree of system pressure of the heat pump unit, α indicates the high-pressure side pressure of the heat pump unit, α 0 represents the preset critical high-pressure side pressure, β represents the low-pressure side pressure of the heat pump unit, and β 0 represents the preset critical low-pressure side pressure, σ1 represents the system pressure abnormality influence factor corresponding to the set high-pressure side pressure, and σ2 represents the system pressure influence factor corresponding to the set low-pressure side pressure.

6. The heat pump unit control method according to claim 5, characterized in that: The abnormal operation evaluation value of the heat pump unit is obtained through processing, and the specific analysis process is as follows: The operation data of the heat pump unit is monitored to obtain the refrigerant flow of the heat pump unit. According to the abnormal degree of system pressure of the heat pump unit and the refrigerant flow of the heat pump unit, the abnormal operation evaluation value of the heat pump unit is comprehensively analyzed. The specific numerical expression is: Where θ represents the abnormal operation evaluation value of the heat pump unit, P X Indicates the abnormal degree of system pressure of the heat pump unit, P Z It represents the refrigerant flow rate of the heat pump unit, δ1 represents the operation abnormality impact factor corresponding to the set system pressure, and δ2 represents the operation abnormality impact factor corresponding to the set refrigerant flow unit value.

7. The heat pump unit control method according to claim 6, characterized in that: The compressor frequency of the heat pump unit is regulated and controlled according to the inverter frequency regulation index of the heat pump unit. The specific analysis process is as follows: According to the environmental interference value of the heat pump unit and the abnormal operation assessment value of the heat pump unit, the inverter frequency adjustment index of the heat pump unit is obtained through comprehensive analysis. The inverter frequency adjustment index of the heat pump unit is matched with the compressor demand frequency corresponding to each inverter frequency adjustment index interval stored in the heat pump unit database to obtain the compressor demand frequency of the heat pump unit, and the compressor frequency is adjusted according to the compressor demand frequency of the heat pump unit.

8. The heat pump unit control method according to claim 4, characterized in that: The environmental interference value of the heat pump unit is specifically expressed as: In the formula, μ represents the environmental interference value of the heat pump unit, Y H Indicates the abnormal humidity and heat value of the heat pump unit, Y F It represents the environmental bearing index of the heat pump unit, ρ1 represents the environmental interference value impact factor corresponding to the environmental humidity and heat abnormality value, and ρ2 represents the environmental interference value impact factor corresponding to the environmental bearing index.

9. The heat pump unit control method according to claim 7, characterized in that: The inverter frequency adjustment index of the heat pump unit, the specific numerical expression is: In the formula, represents the inverter frequency regulation index of the heat pump unit, θ represents the abnormal operation evaluation value of the heat pump unit, μ represents the environmental interference value of the heat pump unit, ω1 represents the inverter frequency regulation index influence factor of the heat pump unit corresponding to the set abnormal operation evaluation value of the heat pump unit, and ω2 represents the inverter frequency regulation index influence factor of the heat pump unit corresponding to the set environmental interference value of the heat pump unit.

10. A heat pump unit using the heat pump unit control method according to any one of claims 1 to 9, characterized in that: include: The inverter is an actuator of the heat pump unit control structure, which is used to receive sensor data and adjust the operating speed of the compressor according to the sensor data to adapt to indoor temperature requirements and energy efficiency requirements; An environmental sensor, which is used to collect environmental parameters of the working area of ​​the heat pump unit; A pressure sensor, wherein the pressure sensor is used to collect system pressure data during operation of the heat pump unit; A refrigerant flow sensor is used to collect the refrigerant flow during the operation of the heat pump unit.

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