Air source heat pump control method and system

Abstract

The present invention provides an air source heat pump control method and system, relating to the technical field of air source heat pump control. The method comprises: obtaining spray parameters, wherein the spray parameters include spray coverage and water pump flow; obtaining evaporator parameters at multiple times during a control cycle via a pressure sensor disposed at a preset position, wherein the evaporator parameters include evaporator inlet pressure and evaporator outlet pressure; obtaining environmental data at the air source heat pump via a combination of sensors disposed at sampling positions at multiple times during the control cycle; determining whether spraying is required based on the evaporator parameters and the environmental data; and, if spraying is required, determining the spraying time based on the spray parameters, the evaporator parameters, and the environmental data. According to the present invention, spraying efficiency and timeliness can be improved, waste of spraying resources can be reduced, and the operating efficiency of the air source heat pump can be improved.

Description

Technical Field

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

[0002] In related technology, CN112781278B discloses an air-source heat pump control method and device, as well as an air-source heat pump. This method includes: upon determining that the air-source heat pump in a heating state requires defrosting, determining heating parameters for the air-source heat pump; controlling the air-source heat pump to heat according to the heating parameters; and controlling the air-source heat pump to defrost after heating is complete. This method can reduce the impact of air-source heat pump defrosting on indoor temperature, thereby improving human comfort.

[0003] CN118189448B discloses an air source heat pump control method, system and heat pump, which relate to the field of air source heat pump control technology. The method includes processing historical operating data of the air source heat pump to obtain a performance loss characterization value of the air source heat pump, and simultaneously monitoring the subordinate operating area of ​​the air source heat pump to obtain a temperature adjustment reference rate of the air source heat pump during actual operation, analyzing and obtaining the target execution adjustment speed of the compressor of the air source heat pump, and finally achieving precise control of the compressor speed of the air source heat pump, so that the air source heat pump can dynamically adjust the compressor of the air source heat pump according to real-time demand, improve the energy efficiency of the air source heat pump, reduce energy consumption, and thus provide effective support for the control effect and operating efficiency of the air source heat pump, thereby effectively optimizing the operating efficiency and overall control coordination of the air source heat pump.

[0004] Based on the above related technologies, the impact of air source heat pump defrosting on indoor temperature can be reduced and human comfort can be improved. However, the related technologies do not consider the impact of overheating and frosting on the operating efficiency of the air source heat pump. That is, it is impossible to determine whether to spray according to the operating conditions and environmental conditions of the air source heat pump to improve the operating efficiency of the air source heat pump. Summary of the Invention

[0005] The present invention provides an air source heat pump control method and system, which can solve the technical problem that related technologies cannot determine whether to spray according to the operating conditions and environmental conditions of the air source heat pump, thereby improving the operating efficiency of the air source heat pump.

[0006] According to a first aspect of the present invention, there is provided an air source heat pump control method, comprising:

[0007] Acquiring spray parameters, wherein the spray parameters include: spray coverage and water pump flow;

[0008] At multiple moments in the control cycle, evaporator parameters are obtained through a pressure sensor set at a preset position, wherein the evaporator parameters include: evaporator inlet pressure and evaporator outlet pressure;

[0009] At multiple moments in the control cycle, environmental data at the air source heat pump is obtained through a combination of sensors arranged at sampling positions, wherein the environmental data includes: temperature data, humidity data and wind speed data;

[0010] Determining whether spraying is required according to the evaporator parameters and the environmental data;

[0011] When spraying is required, the spraying time is determined according to the spraying parameters, the evaporator parameters and the environmental data.

[0012] According to a second aspect of the present invention, there is provided an air source heat pump control system, comprising:

[0013] A spray parameter module is used to obtain spray parameters, wherein the spray parameters include: spray coverage and water pump flow;

[0014] an evaporation parameter module, configured to obtain evaporator parameters at multiple moments in a control cycle through a pressure sensor disposed at a preset position, wherein the evaporator parameters include: an evaporator inlet pressure and an evaporator outlet pressure;

[0015] An environmental data module is used to obtain environmental data at the air source heat pump through a combination of sensors set at sampling positions at multiple moments in the control cycle, wherein the environmental data includes: temperature data, humidity data and wind speed data;

[0016] A spray determination module, configured to determine whether spraying is required based on the evaporator parameters and the environmental data;

[0017] The spraying time module is used to determine the spraying time according to the spraying parameters, the evaporator parameters and the environmental data when spraying is required.

[0018] Technical effect: According to the present invention, the evaporator inlet and outlet pressures and the surrounding environmental data can be accurately collected, and based on the evaporator inlet and outlet pressures and the ambient temperature, it can be judged whether spraying is required and the type of liquid to be sprayed. Furthermore, when it is determined that spraying is required, the spraying time is determined based on the evaporator inlet and outlet pressures, environmental data and spraying parameters, which can improve the efficiency and timeliness of spraying, reduce the waste of spraying resources, and improve the operating efficiency of the air source heat pump. When determining the first control discrimination parameter, the first control discrimination parameter can be determined based on the evaporator inlet pressure, the evaporator outlet pressure and the ambient temperature. During the calculation process, the abnormal condition of the evaporator can be determined in combination with the ambient temperature conditions and the evaporator inlet and outlet pressure difference, and it can be judged whether spraying is required and the specific type of liquid to be sprayed. When determining the first relationship function, the first relationship function can be determined based on the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate. This allows accurate analysis of the impact of the experimental environment, spray coverage rate, and water pump flow rate on the speed at which the air source heat pump returns to normal operating conditions during cold water spraying, thereby improving the accuracy and objectivity of the first relationship function. When determining the second relationship function, the second relationship function can be determined based on the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate. This allows accurate analysis of the impact of the experimental environment, spray coverage rate, and water pump flow rate on the speed at which the air source heat pump returns to normal operating conditions during defrost spraying, thereby improving the accuracy and objectivity of the second relationship function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart showing an exemplary method for controlling an air source heat pump according to an embodiment of the present invention is provided;

[0020] Figure 2 A block diagram of an air source heat pump control system according to an embodiment of the present invention is exemplarily shown. DETAILED DESCRIPTION

[0021] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0022] Figure 1 A flow chart of an air source heat pump control method according to an embodiment of the present invention is exemplarily shown. The method includes:

[0023] Step S101, obtaining spray parameters, wherein the spray parameters include: spray coverage and water pump flow;

[0024] Step S102: acquiring evaporator parameters at multiple moments in a control cycle through a pressure sensor provided at a preset position, wherein the evaporator parameters include: evaporator inlet pressure and evaporator outlet pressure;

[0025] Step S103, at multiple moments in the control cycle, obtaining environmental data at the air source heat pump through a combination of sensors set at sampling positions, wherein the environmental data includes: temperature data, humidity data, and wind speed data;

[0026] Step S104, determining whether spraying is required based on the evaporator parameters and the environmental data;

[0027] Step S105 : When spraying is required, the spraying time is determined according to the spraying parameters, the evaporator parameters and the environmental data.

[0028] According to the air source heat pump control method of an embodiment of the present invention, the evaporator inlet and outlet pressures and ambient environmental data can be accurately collected, and whether spraying is required and the type of sprayed liquid can be judged based on the evaporator inlet and outlet pressures and ambient temperature. Furthermore, when it is determined that spraying is required, the spraying time is determined based on the evaporator inlet and outlet pressures, environmental data and spraying parameters, which can improve the spraying efficiency and timeliness, reduce the waste of spraying resources, and improve the operating efficiency of the air source heat pump.

[0029] According to an embodiment of the present invention, in step S101, spray parameters are acquired, wherein the spray parameters include: spray coverage and water pump flow rate.

[0030] For example, record the surface temperature of the tile before spraying, start spraying for 2-3 minutes, perform thermal imaging analysis on the tile after spraying, and determine that the area of ​​the tile where the temperature drops by more than 2 degrees Celsius is the effective coverage area. The spray coverage rate is determined based on the ratio of the effective coverage area to the total tile area. Use a flow meter to test the water pump flow rate.

[0031] According to an embodiment of the present invention, in step S102, evaporator parameters are acquired at multiple moments in the control cycle through a pressure sensor provided at a preset position, wherein the evaporator parameters include: evaporator inlet pressure and evaporator outlet pressure.

[0032] For example, wireless pressure sensors (such as BME280 modules) are installed at the inlet and outlet of the evaporator to collect the inlet and outlet pressures and upload the data to the cloud in real time.

[0033] According to one embodiment of the present invention, in step S103, at multiple moments in the control cycle, environmental data at the air source heat pump is acquired through a combination of sensors arranged at sampling positions, wherein the environmental data includes temperature data, humidity data and wind speed data.

[0034] For example, the sampling location can accurately reflect the environmental conditions at the location of the air source heat pump. For example, the temperature data, humidity data and wind speed data at the sampling location can be obtained at the place with the lowest object density in the air source heat pump placement area. The temperature data, humidity data and wind speed data at the sampling location can be accurately collected.

[0035] According to an embodiment of the present invention, in step S104, it is determined whether spraying is required based on the evaporator parameters and the environmental data.

[0036] According to one embodiment of the present invention, step S104 includes:

[0037] determining a first control discrimination parameter according to the evaporator inlet pressure, the evaporator outlet pressure, and the ambient temperature;

[0038] Determine whether spraying is required based on the first control discrimination parameter.

[0039] For example, whether spraying is required and the type of spraying liquid are determined based on the evaporator inlet pressure, evaporator outlet pressure and ambient temperature.

[0040] According to one embodiment of the present invention, determining a first control discrimination parameter according to the evaporator inlet pressure, the evaporator outlet pressure and the ambient temperature includes: determining the first control discrimination parameter Cda at the i-th moment of the control period according to formula (1): 1,i ,

[0041] Cda 1,i =if{(|Exp i -Enp i |>Pd T1 )and(Et i >Et T1 ),1,if{(|Exp i -

[0042] Enp i | <Pd T2 )and(Et i <Et T2 ),2,0}}(1)

[0043] Among them, and is the logical operator of "and", if is the conditional function, Exp iis the evaporator outlet pressure at the i-th moment of the control cycle, Enp i is the evaporator inlet pressure at the i-th moment of the control cycle, Pd T1 is the first preset pressure difference threshold, Et i is the temperature data at the i-th moment of the control cycle, Et T1 is the preset first temperature data threshold, Pd T2 is the second preset pressure difference threshold, Et T2 A second temperature data threshold is preset.

[0044] According to one embodiment of the present invention, |Exp i -Enp i | is the difference between the evaporator outlet pressure and the evaporator inlet pressure at the i-th moment of the control cycle, which represents the evaporator inlet and outlet pressure difference. In formula (1), the conditional function if{(|Exp i -Enp i |>Pd T1 )and(Et i >Et T1 ),1,if{(|Exp i -Enp i | <Pd T2 )and(Et i <Et T2 ),2,0}} includes the following two cases, when (|Exp i -Enp i |>Pd T1 )and(Et i >Et T1 ), that is, the evaporator inlet and outlet pressure difference is greater than the first preset pressure difference threshold and the temperature data is greater than the preset first temperature data threshold. For example, the evaporator inlet and outlet pressure difference is greater than 0.8 bar and the temperature data is greater than 25 degrees Celsius. In a high temperature environment (temperature greater than 25 degrees Celsius), the evaporator surface temperature is significantly lower than the dew point temperature, causing water vapor to quickly condense into liquid water, forming a water film on the fin surface, increasing thermal resistance by 30% to 50%, reducing the refrigerant heat absorption efficiency, and incomplete evaporation, resulting in a 3-5 times increase in heat transfer resistance, hindering heat exchange between the refrigerant and the environment. When the evaporator inlet and outlet pressure difference is greater than 0.8 bar, atomized cold water spraying is required to remove the surface water film. The value of this condition function is 1. If (|Exp i -Enp i |>Pd T1 )and(Et i >Et T1 ) condition, the value of the condition function is the inner condition function if{(|Exp i -Enp i| <Pd T2 )and(Et i <Et T2 ),2,0}.

[0045] According to one embodiment of the present invention, in formula (1), the inner condition function if{(|Exp i -Enp i | <Pd T2 )and(Et i <Et T2 ),2,0} includes the following two cases, when (|Exp i -Enp i | <Pd T2 )and(Et i <Et T2 ), that is, the evaporator inlet and outlet pressure difference is less than the second preset pressure difference threshold and the temperature data is less than the preset second temperature data threshold. For example, the evaporator inlet and outlet pressure difference is less than 0.3 bar and the temperature data is less than 0 degrees Celsius. Under standard operating conditions (R410A refrigerant, evaporation temperature -5°C), the theoretical minimum value of the evaporator inlet and outlet pressure difference is 0.2-0.3 bar. If the actual evaporator inlet and outlet pressure difference is less than 0.3 bar, it indicates that the refrigerant flow is severely obstructed and the frost layer thickness has reached a critical value (usually greater than 2 mm). When the temperature data is less than 0 degrees Celsius, the frosting speed is 3-5 times faster than the defrosting speed, and it is necessary to spray a defrosting agent. The value of the inner layer condition function is 2. If (|Exp i -Enp i | <Pd T2 ) condition, no spraying is required and the value of the inner condition function is 0.

[0046] In this way, the first control discrimination parameter can be determined based on the evaporator inlet pressure, evaporator outlet pressure and ambient temperature. During the calculation process, the abnormal condition of the evaporator can be determined in combination with the ambient temperature conditions and the evaporator inlet and outlet pressure difference to determine whether spraying is required and the specific type of liquid to be sprayed.

[0047] According to one embodiment of the present invention, determining whether spraying is required based on the first control discrimination parameter includes:

[0048] When the first control discrimination parameter is equal to 0, it is determined that spraying is not required;

[0049] When the first control discrimination parameter is equal to 1, it is determined that cold water spraying is required;

[0050] When the first control discrimination parameter is equal to 2, it is determined that defrost liquid needs to be sprayed.

[0051] For example, when the first control judgment parameter is equal to 0, it means that overheating and frosting have not occurred and spraying is not required. When the first control judgment parameter is equal to 1, it means that overheating has occurred and atomized cold water spraying is required. When the first control judgment parameter is equal to 2, it means that frosting has occurred and defrost agent injection is required.

[0052] According to an embodiment of the present invention, in step S105 , when spraying is required, the spraying time is determined according to the spraying parameters, the evaporator parameters and the environmental data.

[0053] According to one embodiment of the present invention, step S105 includes:

[0054] At multiple moments in a first historical experiment period, obtaining a first experiment evaporator inlet pressure, a first experiment evaporator outlet pressure, first experiment environmental data, a first experiment spray coverage rate, and a first experiment water pump flow rate, wherein the first experiment environmental data includes: a first experiment temperature, a first experiment humidity, and a first experiment wind speed;

[0055] determining a first relationship function according to the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate;

[0056] At multiple moments in the second historical experiment period, obtaining a second experiment evaporator inlet pressure, a second experiment evaporator outlet pressure, second experiment environmental data, a second experiment spray coverage rate, and a second experiment water pump flow rate, wherein the second experiment environmental data includes: a second experiment temperature, a second experiment humidity, and a second experiment wind speed;

[0057] determining a second relationship function according to the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate;

[0058] The spraying time is determined according to the spraying parameter, the evaporator parameter, the environmental parameter, the first relationship function and the second relationship function.

[0059] For example, in the first historical experiment, the experimental environment temperature was greater than 25 degrees Celsius, and the air source heat pump was in an overheating state, and cold water atomization spraying was performed on the heat sink ceramics. Through the wireless pressure sensor, the first experimental evaporator inlet pressure and the first experimental evaporator outlet pressure in the first historical experimental period were continuously collected, and the first experimental spray coverage, the first experimental water pump flow, the first experimental temperature, the first experimental humidity and the first experimental wind speed were recorded. At the end of the first historical experimental period, the evaporator inlet and outlet pressure difference returned to normal, and the first historical experiment was carried out multiple times in different environments (the experimental environment temperature was always greater than 25 degrees Celsius) and spraying conditions; in the second historical experiment, the experimental environment temperature was less than 0 degrees Celsius, and the air source heat pump was in a frosting state, and the defrosting agent was sprayed on the heat sink ceramics. Through the wireless pressure sensor, the second experimental evaporator inlet pressure in the second historical experimental period was continuously collected. The inlet pressure and the outlet pressure of the second experiment evaporator are recorded, and the second experiment spray coverage, the second experiment water pump flow, the second experiment temperature, the second experiment humidity and the second experiment wind speed are recorded. At the end of the second historical experiment period, the evaporator inlet and outlet pressure difference returns to normal. In different environments (the experimental environment temperature is always less than 0 degrees Celsius) and spray conditions, multiple second historical experiments are carried out; the speed of recovery of the evaporator inlet and outlet pressure difference is related to the experimental environment data, the experimental spray coverage and the second experimental water pump flow to a certain extent. Based on the correlation of the above data, the first relationship function and the second relationship function can be determined; when the first control discrimination parameter is equal to 1, the spray parameters, evaporator parameters and environmental parameters are substituted into the first relationship function to determine the spray time. When the second control discrimination parameter is equal to 2, the spray parameters, evaporator parameters and environmental parameters are substituted into the second relationship function to determine the spray time.

[0060] According to one embodiment of the present invention, determining a first relationship function according to the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate includes: determining a first undetermined coefficient equation of the first relationship function according to formula (2),

[0061]

[0062] Among them, Eexp 1,s is the first experimental evaporator outlet pressure at the beginning of the first historical experimental cycle, Eenp 1,s The first experimental evaporator inlet pressure at the beginning of the first historical experimental cycle, EPd 1,T The first setting experiment evaporator inlet and outlet pressure difference, Fet k is the first experimental temperature at the kth moment of the first historical experimental cycle, Feh k is the first experimental humidity at the kth moment of the first historical experimental cycle, Fefk is the first experimental wind force at the kth moment of the first historical experimental cycle, Scr1 is the first experimental spray coverage rate, Pfr1 is the first experimental water pump flow rate, K is the number of moments in the first historical experimental cycle, k≤K, k and K are both positive integers, β1, β2, β3, β4, β5, β6, β7, β8, β9 and β 10 is the first undetermined coefficient of the first undetermined coefficient equation;

[0063] Solving the first undetermined coefficient according to the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate to obtain a solution value of the first undetermined coefficient;

[0064] A first relationship function is determined according to the solved value of the first undetermined coefficient and the first undetermined coefficient equation.

[0065] According to one embodiment of the present invention, |Eexp 1,s -Eenp 1,s | is the difference between the first experimental evaporator inlet pressure and the first experimental evaporator outlet pressure at the beginning of the first historical experimental cycle, indicating the evaporator inlet and outlet pressure difference at the beginning of the first historical experimental cycle, EPd 1,T For the first setting of the experimental evaporator inlet and outlet pressure difference, when the evaporator inlet and outlet pressure difference is 0.5 bar, the energy efficiency and reliability of the air source heat pump are higher, EPd 1,T Can be set to 0.5bar, is the average evaporator inlet and outlet pressure difference decrease rate in the first historical experimental period, indicating the recovery speed of the air source heat pump to normal working conditions when using atomized cold water spray.

[0066] According to one embodiment of the present invention, It indicates that the recovery speed of the air source heat pump to normal working conditions is positively correlated with the average first experimental wind speed of the first historical experimental period. For example, the greater the wind speed in the experimental environment, the better the heat dissipation effect of the air source heat pump, and the faster the air source heat pump recovers to normal working conditions. (β3Scr1+β4) indicates that the recovery speed of the air source heat pump to normal working conditions is positively correlated with the first experimental spray coverage rate. For example, the higher the spray coverage rate, the better the heat dissipation effect of the air source heat pump, and the faster the air source heat pump recovers to normal working conditions. (β5Pfr1+β6) indicates that the recovery speed of the air source heat pump to normal working conditions is positively correlated with the first experimental water pump flow rate. For example, the greater the water pump flow rate, the better the heat dissipation effect, and the faster the air source heat pump recovers to normal working conditions. It indicates that the recovery speed of the air source heat pump to normal working conditions is negatively correlated with the average first experimental temperature of the first historical experimental period. For example, the higher the experimental temperature, the worse the heat exchange effect between the air source heat pump and the surrounding environment, the worse the heat dissipation effect of the air source heat pump, and the slower the recovery speed of the air source heat pump to normal working conditions. This indicates that the air-source heat pump's recovery speed to normal operation is negatively correlated with the average first experimental humidity of the first historical experimental period. For example, higher humidity increases the likelihood of water film formation, leading to poorer heat dissipation and slower recovery. Based on this relationship, the first undetermined coefficient equation for the first relationship function can be obtained.

[0067] According to one embodiment of the present invention, fitting can be performed based on multiple parameters involved in the first undetermined coefficients, that is, fitting can be performed based on the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate to solve the above multiple first undetermined coefficients. There are 10 first undetermined coefficients, namely, β1, β2, β3, β4, β5, β6, β7, β8, β9, and β1. 10 , the above 10 first undetermined coefficients are solved according to the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate and the first experimental water pump flow rate of at least 10 first historical experimental cycles to obtain the solution values ​​of the above 10 first undetermined coefficients, and the solution values ​​of the above 10 first undetermined coefficients are substituted into the first undetermined coefficient equation to determine the first relationship function.

[0068] In this way, the first relationship function can be determined based on the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate and the first experimental water pump flow rate. The influence of the experimental environment, spray coverage rate and water pump flow rate on the recovery speed of the air source heat pump to normal working conditions when cold water spraying can be accurately analyzed, thereby improving the accuracy and objectivity of the first relationship function.

[0069] According to one embodiment of the present invention, determining a second relationship function according to the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate includes: determining a second undetermined coefficient equation of the second relationship function according to formula (3),

[0070]

[0071] Among them, Eexp 2,s is the outlet pressure of the second experimental evaporator at the beginning of the second historical experimental cycle, Eenp2,s The inlet pressure of the second experimental evaporator at the beginning of the second historical experimental period, EPd 2,T The second setting experiment evaporator inlet and outlet pressure difference, Set r is the second experimental temperature at the rth moment of the second historical experimental cycle, Seh r is the second experimental humidity at the rth moment of the second historical experimental cycle, Sef r is the second experimental wind force at the rth moment of the second historical experimental cycle, Scr2 is the second experimental spray coverage, Pfr2 is the second experimental pump flow, R is the number of moments in the second historical experimental cycle, r≤R, r and R are both positive integers, β s1 , β s2 , β s3 , β s4 , β s5 , β s6 , β s7 , β s8 , β s9 and β s10 is the second undetermined coefficient of the second undetermined coefficient equation;

[0072] Solving the second undetermined coefficient according to the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate to obtain a solution value of the second undetermined coefficient;

[0073] A second relationship function is determined according to the solved value of the second undetermined coefficient and the second undetermined coefficient equation.

[0074] According to one embodiment of the present invention, |Eexp 2,s -Eenp 2,s | is the difference between the second experimental evaporator inlet pressure and the second experimental evaporator outlet pressure at the start of the second historical experimental cycle, indicating the evaporator inlet and outlet pressure difference at the start of the second historical experimental cycle, EPd 2,T The second setting experiment evaporator inlet and outlet pressure difference, EPd 2,T When the pressure is 0.5 bar, the energy efficiency and reliability of the air source heat pump are higher, EPd 2,T Can be set to 0.5bar, is the average evaporator inlet and outlet pressure difference rising rate in the second historical experimental period, which represents the defrosting speed when the defrosting agent is used for spraying, that is, the recovery speed of the air source heat pump to restore normal working conditions.

[0075] According to one embodiment of the present invention, (β s3 Scr2+β s4) indicates that the recovery speed of the air source heat pump to normal working conditions is positively correlated with the spray coverage rate of the second experiment. For example, the higher the spray coverage rate, the faster the defrosting efficiency, and the faster the air source heat pump to normal working conditions. (β s5 Pfr2+β s6 ) indicates that the recovery speed of the air source heat pump to normal working conditions is positively correlated with the water pump flow rate of the second experiment. For example, the greater the water pump flow rate, the more defrosting agent is sprayed, the faster the defrosting efficiency is, and the faster the air source heat pump recovers to normal working conditions. It indicates that the recovery speed of the air source heat pump to normal working condition is positively correlated with the average second experimental temperature of the second historical experimental period. For example, the higher the ambient temperature, the faster the frost dissipates naturally, and the faster the air source heat pump recovers to normal working condition. The recovery speed of the air source heat pump to normal working conditions is positively correlated with the average second experimental wind speed of the second historical experimental period. For example, the stronger the wind speed, the better the heat exchange effect between the frosted area and the surrounding air, which affects the spraying of the defrosting agent. The worse the defrosting effect, the slower the recovery speed of the air source heat pump to normal working conditions. This indicates that the air-source heat pump's recovery speed to normal operation is negatively correlated with the average second experimental humidity of the second historical experimental period. For example, the higher the humidity, the more likely frost will form, and the slower the air-source heat pump will recover. Based on this relationship, the second undetermined coefficient equation for the second relationship function can be obtained.

[0076] According to one embodiment of the present invention, the second undetermined coefficients can be fitted based on multiple parameters involved in the above-mentioned second undetermined coefficients, that is, based on the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate, to solve the above-mentioned multiple second undetermined coefficients. There are 10 second undetermined coefficients, namely, β s1 , β s2 , β s3 , β s4 , β s5 , β s6 , β s7 , β s8 , β s9 and β s10 , solve the above 10 second undetermined coefficients according to the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate and the second experimental water pump flow rate of at least 10 second historical experimental cycles to obtain the solution values ​​of the above 10 second undetermined coefficients, and substitute the solution values ​​of the above 10 second undetermined coefficients into the second undetermined coefficient equation to determine the second relationship function.

[0077] In this way, the second relationship function can be determined based on the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate and the second experimental water pump flow rate. The influence of the experimental environment, spray coverage rate and water pump flow rate on the recovery speed of the air source heat pump to normal working conditions when the defrost agent is sprayed can be accurately analyzed, thereby improving the accuracy and objectivity of the second relationship function.

[0078] According to the air source heat pump control method of an embodiment of the present invention, it is possible to accurately collect evaporator inlet and outlet pressures and ambient environmental data, and determine whether spraying is required and the type of liquid to be sprayed based on the evaporator inlet and outlet pressures and ambient temperature. Furthermore, when it is determined that spraying is required, the spraying time is determined based on the evaporator inlet and outlet pressures, environmental data, and spraying parameters, which can improve the efficiency and timeliness of spraying, reduce the waste of spraying resources, and improve the operating efficiency of the air source heat pump. When determining the first control discrimination parameter, the first control discrimination parameter can be determined based on the evaporator inlet pressure, evaporator outlet pressure, and ambient temperature. During the calculation process, the ambient temperature conditions and the evaporator inlet and outlet pressure difference can be combined to determine the abnormal condition of the evaporator, determine whether spraying is required, and determine the specific type of liquid to be sprayed. When determining the first relationship function, the first relationship function can be determined based on the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate. This allows accurate analysis of the impact of the experimental environment, spray coverage rate, and water pump flow rate on the speed at which the air source heat pump returns to normal operating conditions during cold water spraying, thereby improving the accuracy and objectivity of the first relationship function. When determining the second relationship function, the second relationship function can be determined based on the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate. This allows accurate analysis of the impact of the experimental environment, spray coverage rate, and water pump flow rate on the speed at which the air source heat pump returns to normal operating conditions during defrost spraying, thereby improving the accuracy and objectivity of the second relationship function.

[0079] Figure 2 The following is a block diagram of an air source heat pump control system according to an embodiment of the present invention, wherein the system includes:

[0080] A spray parameter module is used to obtain spray parameters, wherein the spray parameters include: spray coverage and water pump flow;

[0081] an evaporation parameter module, configured to obtain evaporator parameters at multiple moments in a control cycle through a pressure sensor disposed at a preset position, wherein the evaporator parameters include: an evaporator inlet pressure and an evaporator outlet pressure;

[0082] An environmental data module is used to obtain environmental data at the air source heat pump through a combination of sensors set at sampling positions at multiple moments in the control cycle, wherein the environmental data includes: temperature data, humidity data and wind speed data;

[0083] A spray determination module, configured to determine whether spraying is required based on the evaporator parameters and the environmental data;

[0084] The spraying time module is used to determine the spraying time according to the spraying parameters, the evaporator parameters and the environmental data when spraying is required.

[0085] The present invention may be a method, an apparatus, a system and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for executing various aspects of the present invention.

[0086] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A method for controlling an air source heat pump, characterized in that: include: Acquiring spray parameters, wherein the spray parameters include: spray coverage and water pump flow; At multiple moments in the control cycle, evaporator parameters are obtained through a pressure sensor set at a preset position, wherein the evaporator parameters include: evaporator inlet pressure and evaporator outlet pressure; At multiple moments in the control cycle, environmental data at the air source heat pump is obtained through a combination of sensors arranged at sampling positions, wherein the environmental data includes: temperature data, humidity data and wind speed data; Determining whether spraying is required according to the evaporator parameters and the environmental data; When spraying is required, the spraying time is determined according to the spraying parameters, the evaporator parameters and the environmental data.

2. The air source heat pump control method according to claim 1, characterized in that: Determining whether spraying is required according to the evaporator parameters and the environmental data includes: determining a first control discrimination parameter according to the evaporator inlet pressure, the evaporator outlet pressure, and the temperature data; Determine whether spraying is required based on the first control discrimination parameter.

3. The air source heat pump control method according to claim 2, characterized in that: Determining a first control discrimination parameter according to the evaporator inlet pressure, the evaporator outlet pressure, and the temperature data includes: According to the formula Cda 1,i =if{(|Exp i -Enp i |>Pd T1 )and(Et i >Et T1 ),1,if{(|Exp i -Enp i |<Pd T2 )and(Et i <Et T2 ),2,0}} Determine the first control discrimination parameter Cda at the i-th moment of the control cycle 1,i , where and is the logical operator of "and", if is the conditional function, Exp i is the evaporator outlet pressure at the i-th moment of the control cycle, Enp i is the evaporator inlet pressure at the i-th moment of the control cycle, Pd T1 is the first preset pressure difference threshold, Et i is the temperature data at the i-th moment of the control cycle, Et T1 is the preset first temperature data threshold, Pd T2 is the second preset pressure difference threshold, Et T2 A second temperature data threshold is preset.

4. The air source heat pump control method according to claim 2, characterized in that: Determining whether spraying is required according to the first control discrimination parameter includes: When the first control discrimination parameter is equal to 0, it is determined that spraying is not required; When the first control discrimination parameter is equal to 1, it is determined that cold water spraying is required; When the first control discrimination parameter is equal to 2, it is determined that defrost liquid needs to be sprayed.

5. The air source heat pump control method according to claim 1, characterized in that: When spraying is required, determining the spraying time according to the spraying parameters, the evaporator parameters and the environmental data includes: At multiple moments in a first historical experiment period, obtaining a first experiment evaporator inlet pressure, a first experiment evaporator outlet pressure, first experiment environmental data, a first experiment spray coverage rate, and a first experiment water pump flow rate, wherein the first experiment environmental data includes: a first experiment temperature, a first experiment humidity, and a first experiment wind speed; determining a first relationship function according to the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate; At multiple moments in the second historical experiment period, obtaining a second experiment evaporator inlet pressure, a second experiment evaporator outlet pressure, second experiment environmental data, a second experiment spray coverage rate, and a second experiment water pump flow rate, wherein the second experiment environmental data includes: a second experiment temperature, a second experiment humidity, and a second experiment wind speed; determining a second relationship function according to the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate; The spraying time is determined according to the spraying parameter, the evaporator parameter, the environmental data, the first relationship function and the second relationship function.

6. The air source heat pump control method according to claim 5, characterized in that: Determining a first relationship function according to the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate includes: According to the formula Determine the first undetermined coefficient equation of the first relationship function, where Eexp 1,s is the first experimental evaporator outlet pressure at the beginning of the first historical experimental cycle, Eenp 1,s The first experimental evaporator inlet pressure at the beginning of the first historical experimental cycle, EPd 1,T The first setting experiment evaporator inlet and outlet pressure difference, Fet k is the first experimental temperature at the kth moment of the first historical experimental cycle, Feh k is the first experimental humidity at the kth moment of the first historical experimental cycle, Fef k is the first experimental wind force at the kth moment of the first historical experimental cycle, Scr1 is the first experimental spray coverage rate, Pfr1 is the first experimental water pump flow rate, K is the number of moments in the first historical experimental cycle, k≤K, k and K are both positive integers, β1, β2, β3, β4, β5, β6, β7, β8, β9 and β 10 is the first undetermined coefficient of the first undetermined coefficient equation; Solving the first undetermined coefficient according to the first experimental evaporator inlet pressure, the first experimental evaporator outlet pressure, the first experimental environmental data, the first experimental spray coverage rate, and the first experimental water pump flow rate to obtain a solution value of the first undetermined coefficient; A first relationship function is determined according to the solved value of the first undetermined coefficient and the first undetermined coefficient equation.

7. The air source heat pump control method according to claim 5, characterized in that: Determining a second relationship function according to the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate includes: According to the formula Determine the second undetermined coefficient equation of the second relationship function, where Eexp 2,s is the outlet pressure of the second experimental evaporator at the beginning of the second historical experimental cycle, Eenp 2,s The inlet pressure of the second experimental evaporator at the beginning of the second historical experimental period, EPd 2,T The second setting experiment evaporator inlet and outlet pressure difference, Set r is the second experimental temperature at the rth moment of the second historical experimental cycle, Seh r is the second experimental humidity at the rth moment of the second historical experimental cycle, Sef r is the second experimental wind force at the rth moment of the second historical experimental cycle, Scr2 is the second experimental spray coverage, Pfr2 is the second experimental pump flow, R is the number of moments in the second historical experimental cycle, r≤R, r and R are both positive integers, β s1 , β s2 , β s3 , β s4 , β s5 , β s6 , β s7 , β s8 , β s9 and β s10 is the second undetermined coefficient of the second undetermined coefficient equation; Solving the second undetermined coefficient according to the second experimental evaporator inlet pressure, the second experimental evaporator outlet pressure, the second experimental environmental data, the second experimental spray coverage rate, and the second experimental water pump flow rate to obtain a solution value of the second undetermined coefficient; A second relationship function is determined according to the solved value of the second undetermined coefficient and the second undetermined coefficient equation.

8. An air source heat pump control system, characterized in that: include: A spray parameter module is used to obtain spray parameters, wherein the spray parameters include: spray coverage and water pump flow; an evaporation parameter module, configured to obtain evaporator parameters at multiple moments in a control cycle through a pressure sensor disposed at a preset position, wherein the evaporator parameters include: an evaporator inlet pressure and an evaporator outlet pressure; An environmental data module is used to obtain environmental data at the air source heat pump through a combination of sensors set at sampling positions at multiple moments in the control cycle, wherein the environmental data includes: temperature data, humidity data and wind speed data; A spray determination module, configured to determine whether spraying is required based on the evaporator parameters and the environmental data; The spraying time module is used to determine the spraying time according to the spraying parameters, the evaporator parameters and the environmental data when spraying is required.

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