Dynamic energy-saving control method and system for variable-frequency air handling unit of air conditioning system and medium

Abstract

The invention provides a dynamic energy-saving control method and system for a variable-frequency air handling unit of an air conditioning system and a medium. The method comprises the steps of obtaining a current temperature value, a temperature set value, a humidity set value, a return air temperature value, a return air humidity value, an operation mode of the air conditioning system set by a user and a direct expansion control word after surface cooling; searching a target dew point temperature value based on the temperature set value and the humidity set value; searching a dynamic temperature set value based on the return air temperature value and the temperature set value; based on the operation mode and the direct expansion control word, the air conditioning system dynamically configures a temperature control target value after surface cooling according to the temperature set value, the return air temperature value, the dynamic temperature set value and the target dew point temperature value; and finally, the temperature control target value obtained after surface cooling serves as a target value, the current temperature value obtained after surface cooling serves as a current value, and the frequency of an inverter compressor of the air conditioning system is adjusted through closed-loop control.

Description

Technical Field

[0001] The present invention relates to the field of energy-saving control technology for air-conditioning units, in particular to energy-saving control technology for variable frequency air handling units of air-conditioning systems, and specifically to a dynamic energy-saving control method, system and medium for variable frequency air handling units of air-conditioning systems applied to clean environments. Background Art

[0002] In the energy-saving control process of the variable frequency air handling unit of the terminal air conditioning system, the surface cooling (i.e., surface cooler) of the air conditioning unit has different functional requirements according to different geographical locations or customer settings. Some units need to dehumidify in summer. The dehumidification unit is borne by the surface cooling section. The relative humidity after surface cooling can reach 100% during dehumidification. The sensor is easily damaged in a high-humidity environment, so it is suitable to configure a temperature PT100 or PT1000 sensor. At this time, it is suitable to achieve the purpose of dehumidification by controlling the temperature after surface cooling to reach the set dew point. Then how to quickly and accurately calculate and determine the machine dew point temperature in the control system becomes the key to the dehumidification effect. In the prior art, the dew point temperature value is found by table lookup method or trial algorithm. When the table lookup method is used, the value not included in the table is estimated by the adjacent value, and the accuracy is low. The trial algorithm requires a large amount of calculation, and the calculation is continuously calculated by increasing or decreasing the value of the gradient. The required computing resources, number of calculations and efficiency are relatively low, and the accuracy depends on the gradient value, which is prone to deviation. Summary of the invention

[0003] In view of the defects and shortcomings of the prior art, according to the first aspect of the present invention, a dynamic energy-saving control method for a variable frequency air handling unit of an air-conditioning system is proposed. Based on different operating modes of the air-conditioning system, the temperature control target value is dynamically configured according to the user's temperature setting value, the return air temperature value, the dynamic temperature setting value and the dew point temperature target value, and accordingly, the temperature control target value after surface cooling is used as the target value, and the current value of the temperature after surface cooling is used as the current value. The frequency of the variable frequency compressor of the air-conditioning system is adjusted through closed-loop control to improve the stability and control accuracy of the air-conditioning system control.

[0004] The dynamic energy-saving control method of the variable frequency air handling unit of the air conditioning system according to the first aspect above comprises the following steps:

[0005] Get the current value of the table temperature after cooling Tcpv;

[0006] Obtain the temperature setting value Tsp and humidity setting value Hsp input by the user;

[0007] Obtain the return air temperature value Tpv and the return air humidity value Hpv detected by the return air temperature and humidity sensor located on the return air side of the air conditioning system;

[0008] Acquire an operation mode of the air conditioning system set by a user, where the operation mode includes one of cooling, heating or ventilation;

[0009] Get the direct expansion control word of the cooling mode or heating mode set by the user;

[0010] Based on the temperature setting value Tsp and the humidity setting value Hsp, finding the target dew point temperature value Tdsp;

[0011] Based on the return air temperature value Tpv and the temperature setting value Tsp, find the dynamic temperature setting value Tdysp;

[0012] Based on the operation mode set by the user and the direct expansion control word in the corresponding operation mode, the air conditioning system dynamically configures the temperature control target value Tcsp after surface cooling according to the temperature setting value Tsp, the return air temperature value Tpv, the dynamic temperature setting value Tdysp and the target dew point temperature value Tdsp; and

[0013] The temperature control target value Tcsp after surface cooling is used as the target value, and the current value Tcpv of the temperature after surface cooling is used as the current value, and the frequency of the variable frequency compressor of the air-conditioning system is adjusted through closed-loop control.

[0014] As an optional implementation, the method further includes the following steps:

[0015] In response to the operating mode of the air-conditioning system set by the user being cooling, and the direct expansion control word set by the user in the cooling mode being one of dehumidification, constant temperature setting, and dynamic temperature setting, the temperature control target value Tcsp is determined in the following manner:

[0016] When the operation mode = cooling, and the cooling mode direct expansion control word = dehumidification, Tcsp = Tdsp;

[0017] When the operation mode = cooling, and the cooling mode direct expansion control word = constant temperature setting, Tcsp = Tsp-Δt1;

[0018] When the operation mode = cooling, and the cooling mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp-Δt1;

[0019] Wherein, the Δt1 represents the refrigeration supplementary temperature difference setting value.

[0020] As an optional implementation, in response to the operation mode of the air-conditioning system set by the user being heating, and the direct expansion control word set by the user in the heating mode is one of a constant temperature setting and a dynamic temperature setting, the temperature control target value Tcsp is determined in the following manner:

[0021] When the operation mode = heating, and the heating mode direct expansion control word = constant temperature setting, Tcsp = Tsp + Δt2;

[0022] When the operation mode = heating, and the heating mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp + Δt2;

[0023] Wherein, the Δt2 represents the heating supplementary temperature difference setting value.

[0024] As an optional implementation, when the operation mode of the air conditioning system is cooling or heating, based on the return air temperature value Tpv and the temperature setting value Tsp, finding the dynamic temperature setting value Tdysp includes:

[0025] Tdysp=Tsp-Δt;

[0026] Δt=Tpv-Tsp;

[0027] Wherein, Δta represents the deviation of the temperature setting value in cooling or heating mode.

[0028] As an optional implementation, the finding of the target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp includes:

[0029] Step 1, calculating the absolute moisture content ABpv according to the temperature setting value Tsp and the humidity setting value Hsp;

[0030] Step 2, initialize the high and low temperature range to (f(a), f(b)), where f(a) represents the low temperature value and f(b) represents the high temperature value; the initial value of f(a) is set to the preset temperature negative value K, the initial value of f(b) is set to the temperature setting value Tsp, and the initial high and low temperature range is (K, Tsp);

[0031] Step 3, using the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and taking 100% as the relative humidity, calculate the absolute moisture content value ABspi;

[0032] Step 4: According to the high and low temperature intervals corresponding to the current calculated absolute moisture content value ABspi, determine the average value f(x) of the high temperature value and the low temperature value; according to the comparison result of the absolute moisture content value ABspi and the absolute moisture content ABpv, replace one of the high temperature value and the low temperature value with the average value f(x), and update the high and low temperature intervals;

[0033] Step 5: Repeat steps 3-4 N times, and take the average value f(x) of the last output low temperature value f(a) and high temperature value f(b) as the dew point temperature target value.

[0034] As an optional implementation, the above-mentioned calculation of the absolute moisture content ABpv according to the temperature setting value Tsp and the humidity setting value Hsp includes:

[0035] Absolute moisture content ABpv = 0.6219*0.01*Hsp*Pv1 / (101326-0.018Hsp*Pv1)

[0036] Where Pv1 = 611.2e [(18678-Tsp / 234.5) / Tsp] / (Tsp+257.14) ;

[0037] Wherein, Pv1 represents the saturated pressure of water vapor at the temperature setting value Tsp, the unit is Pa; the unit of the temperature setting value Tsp is ℃; the humidity setting value Hsp is a percentage value.

[0038] As an optional implementation, in the aforementioned step 2, the absolute moisture content calculated value ABspi is calculated based on the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and 100% as the relative humidity, including:

[0039] (1) Based on the high temperature value f(b) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi:

[0040] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0041] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / (f(b)+257.14) ;

[0042] Where, Pv1 represents the saturated pressure of water vapor at the high temperature value f(b), the unit is Pa; the unit of the high temperature value f(b) is ℃;

[0043] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute humidity value ABspi:

[0044] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0045] Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / (f(a)+257.14) ;

[0046] Wherein, Pv1 represents the saturated pressure of water vapor at the low temperature f(a), the unit is Pa; the unit of the low temperature f(a) is ℃.

[0047] As an optional implementation, in the aforementioned step 4, according to the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, one of the high temperature value and the low temperature value is replaced by the average value f(x), and the high and low temperature ranges are updated, including:

[0048] If the absolute moisture content calculation value ABspi is greater than the absolute moisture content comparison result ABpv, the high temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated high temperature value, and the high and low temperature ranges are updated in combination with the low temperature value that has not been replaced;

[0049] If the calculated absolute moisture content ABspi is less than the comparison result of the absolute moisture content ABpv, the low temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated low temperature value, and the high and low temperature ranges are updated in combination with the high temperature value that has not been replaced.

[0050] According to the second aspect of the purpose of the present invention, a method for quickly and accurately setting the dew point temperature target value is proposed. Based on the principle that the absolute moisture content remains unchanged during the process of the temperature at any state point dropping to the dew point temperature, a rapid cycle calculation using the binary search method is used to achieve rapid and accurate setting of the target dew point temperature value, thereby improving the control efficiency and accuracy of the dehumidification operation in the refrigeration mode.

[0051] The method for quickly obtaining a target dew point temperature value according to the second aspect comprises the following steps:

[0052] Step 1: Calculate the absolute moisture content ABpv according to the temperature setting value Tsp and the humidity setting value Hsp input by the user;

[0053] Step 2, initialize the high and low temperature range to (f(a), f(b)), where f(a) represents the low temperature value and f(b) represents the high temperature value; the initial value of f(a) is set to the preset temperature negative value K, the initial value of f(b) is set to the temperature setting value Tsp, and the initial high and low temperature range is (K, Tsp);

[0054] Step 3, using the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and taking 100% as the relative humidity, calculate the absolute moisture content value ABspi;

[0055] Step 4: According to the high and low temperature intervals corresponding to the current calculated absolute moisture content value ABspi, determine the average value f(x) of the high temperature value and the low temperature value; according to the comparison result of the absolute moisture content value ABspi and the absolute moisture content ABpv, replace one of the high temperature value and the low temperature value with the average value f(x), and update the high and low temperature intervals;

[0056] Step 5: Repeat steps 3-4 N times, and take the average value f(x) of the last output low temperature value f(a) and high temperature value f(b) as the dew point temperature target value.

[0057] As an optional implementation, according to the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, one of the high temperature value and the low temperature value is replaced by the average value f(x), and the high and low temperature ranges are updated, including:

[0058] If the absolute moisture content calculation value ABspi is greater than the absolute moisture content comparison result ABpv, the high temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated high temperature value, and the high and low temperature ranges are updated in combination with the low temperature value that has not been replaced;

[0059] If the calculated absolute moisture content ABspi is less than the comparison result of the absolute moisture content ABpv, the low temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated low temperature value, and the high and low temperature ranges are updated in combination with the high temperature value that has not been replaced.

[0060] According to a third aspect of the present invention, a computer system is provided, comprising:

[0061] one or more processors;

[0062] The memory stores operable instructions, which, when executed by the one or more processors, enable the one or more processors to perform operations, wherein the operations include the process of executing the aforementioned method.

[0063] According to a fourth aspect of the present invention, a computer-readable medium storing software is provided, wherein the software includes instructions executable by one or more computers, and the instructions, when executed by the one or more computers, perform the process of the aforementioned method.

[0064] According to a fifth aspect of the present invention, a computer program product is provided, comprising a computer program, wherein the computer program implements the process of the aforementioned method when executed by a processor.

[0065] Combined with the dynamic energy-saving control method of the variable frequency air handling unit of the air-conditioning system of the above embodiment, in some areas in the northwest or when there is no requirement for humidity at the user site, the daily operation of the air-conditioning unit does not require dehumidification, so the surface cooling assumes the function of cooling without dehumidification, and dehumidification is not selected in this case. In the cooling mode, when the cooling mode control word is a constant temperature setting, the temperature after the surface cooling is set to a constant value. When the cooling mode control word is a dynamic temperature setting, the temperature setting after the surface cooling changes dynamically according to the changes in the current temperature value and the temperature setting value, so as to achieve the effect of rapid cooling. This dynamic change in temperature is that the current value changes after the refrigeration effect of the compressor is released, and the temperature will change dynamically.

[0066] Compared with other existing control methods that dynamically adjust the temperature setting value according to the time period, in the existing methods, although the compressor has not been put into use or released energy for a long time, the temperature setting value has changed due to the time judgment cycle, thus causing overshoot. The dynamic temperature setting proposed in the present invention can not only achieve the effect of rapid cooling, but also be more stable and less prone to overshoot. When heating in winter, when the heating mode control word is a constant temperature setting, the temperature setting after the surface is cooled is a constant value. When the heating mode control word is a dynamic temperature setting, the temperature setting after the surface is cooled changes dynamically according to the changes in the current temperature value and the temperature setting value, achieving the effect of rapid cooling.

[0067] The dynamic energy-saving control method of the variable frequency air handling unit of the air-conditioning system proposed by the present invention is particularly applicable to the control of the air-conditioning system in a clean environment.

[0068] In the method for quickly obtaining the target dew point temperature value proposed in the present invention, according to the temperature value set by the user and the target relative humidity value, based on the principle that the absolute moisture content is constant in the process of the temperature at any state point dropping to the dew point temperature, a fast cycle calculation is performed by binary division, and each calculation result is dynamically updated by comparing with the absolute moisture content to find the dew point temperature interval, and the dew point temperature is continuously narrowed and approached through cyclic calculation, so as to achieve the fast and accurate setting of the target dew point temperature value and improve the control efficiency and accuracy of the dehumidification operation in the refrigeration mode. Compared with the pilot algorithm and the table lookup method in the prior art, the method for quickly obtaining the target dew point temperature value proposed in the present invention consumes less computing resources, determines the dew point temperature value quickly, and has high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 It is a flow chart of a dynamic energy-saving control method for a variable frequency air handling unit of an air-conditioning system according to an embodiment of the present invention.

[0070] Figure 2 4 is a schematic diagram of setting a target temperature setting value in a cooling mode according to an embodiment of the present invention.

[0071] Figure 3 4 is a schematic diagram of setting a target temperature setting value in a heating mode according to an embodiment of the present invention.

[0072] Figure 4 4 is a flow chart of a method for quickly obtaining a target dew point temperature value according to an embodiment of the present invention.

[0073] Figure 5 Schematic diagram of an application environment of a dynamic energy-saving control method for a variable frequency air handling unit of an air-conditioning system according to an embodiment of the present invention.

[0074] Figure 6 is a schematic diagram of a computer system according to an embodiment of the present invention.

[0075] Figure 7 is a schematic diagram of a dynamic energy-saving control device for a variable frequency air handling unit of an air-conditioning system according to an embodiment of the present invention.

[0076] Figure 8 The figure is a flow chart of a method for quickly obtaining a dew point temperature value in a current state according to an embodiment of the present invention.

[0077] Fig. 9 is a schematic diagram of a device for quickly acquiring a dew point temperature value in a current state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0078] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0079] Example 1

[0080] Combination Figure 1 As shown, according to the present disclosure, a dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system is proposed, comprising the following steps:

[0081] Step S101: obtaining the current value of the temperature after the surface is cooled Tcpv;

[0082] Step S102: Acquire the temperature setting value Tsp and humidity setting value Hsp input by the user;

[0083] Step S103: obtaining a return air temperature value Tpv and a return air humidity value Hpv detected by a return air temperature and humidity sensor located on the return air side of the air conditioning system;

[0084] Step S104: obtaining an operation mode of the air conditioning system set by the user, wherein the operation mode includes one of cooling, heating or ventilation;

[0085] Step S105: obtaining the direct expansion control word of the cooling mode or heating mode set by the user;

[0086] Step S106: Finding a target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp;

[0087] Step S107: Finding a dynamic temperature setting value Tdysp based on the return air temperature value Tpv and the temperature setting value Tsp;

[0088] Step S108: Based on the operation mode set by the user and the direct expansion control word in the corresponding operation mode, the air conditioning system dynamically configures the temperature control target value Tcsp after surface cooling according to the temperature setting value Tsp, the return air temperature value Tpv, the dynamic temperature setting value Tdysp and the target dew point temperature value Tdsp; and

[0089] Step S109: Using the temperature control target value Tcsp after surface cooling as the target value and the current value Tcpv of the temperature after surface cooling as the current value, the frequency of the variable frequency compressor of the air-conditioning system is adjusted through closed-loop control.

[0090] In an embodiment of the present invention, the current value Tcpv of the surface cooling temperature can be obtained by real-time measurement by a temperature sensor configured in the surface cooling pipeline, for example, by using a PT100 temperature sensor for detection.

[0091] A return air temperature and humidity sensor, such as a dry-bulb and wet-bulb sensor, is set on the return air side of the air conditioning system to detect the return air temperature value Tpv and the return air humidity value Hpv.

[0092] As an optional embodiment, in step S107, according to different operation modes of the air-conditioning system, a dynamic temperature setting value Tdysp is found based on the return air temperature value Tpv and the temperature setting value Tsp.

[0093] like Figure 2 , 3 As shown, when the operation mode of the air conditioning system is cooling or heating, based on the return air temperature value Tpv and the temperature setting value Tsp, the dynamic temperature setting value Tdysp is found, including:

[0094] Tdysp=Tsp-Δt;

[0095] Δt=Tpv-Tsp;

[0096] Wherein, Δta represents the deviation of the temperature setting value in cooling or heating mode.

[0097] As an optional implementation, the method further includes the following steps:

[0098] In response to the operating mode of the air-conditioning system set by the user being cooling, and the direct expansion control word set by the user in the cooling mode being one of dehumidification, constant temperature setting, and dynamic temperature setting, the temperature control target value Tcsp is determined in the following manner:

[0099] When the operation mode = cooling, and the cooling mode direct expansion control word = dehumidification, Tcsp = Tdsp;

[0100] When the operation mode = cooling, and the cooling mode direct expansion control word = constant temperature setting, Tcsp = Tsp-Δt1;

[0101] When the operation mode = cooling, and the cooling mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp-Δt1;

[0102] Wherein, the Δt1 represents the refrigeration supplementary temperature difference setting value.

[0103] As an optional implementation, in response to the operation mode of the air-conditioning system set by the user being heating, and the direct expansion control word set by the user in the heating mode is one of a constant temperature setting and a dynamic temperature setting, the temperature control target value Tcsp is determined in the following manner:

[0104] When the operation mode = heating, and the heating mode direct expansion control word = constant temperature setting, Tcsp = Tsp + Δt2;

[0105] When the operation mode = heating, and the heating mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp + Δt2;

[0106] Wherein, the Δt2 represents the heating supplementary temperature difference setting value.

[0107] Figure 2 The figure shows an exemplary setting principle diagram of the target temperature setting value in the cooling mode. Figure 2 As shown, in the cooling mode, it is equivalent to shifting the mirror temperature value of the current return air temperature and the set temperature value set by the user downward by Δt1.

[0108] Figure 3 The figure shows an exemplary setting principle diagram of the target temperature setting value in the heating mode. Figure 3 As shown, in the heating mode, it is equivalent to shifting the mirror temperature value of the current return air temperature and the set temperature value set by the user upward by Δt2.

[0109] Therefore, in cooling mode and heating mode, when the direct expansion control word is a dynamic temperature setting, the temperature setting after cooling changes dynamically according to the changes in the current temperature value and the temperature setting value, achieving a rapid cooling effect. This dynamic temperature change is based on the release of the cooling effect of the direct expansion compressor to change the current value, and the temperature setting value will change dynamically, which not only achieves a rapid cooling effect, but also ensures the stability and accuracy of the control process, and does not cause overshoot.

[0110] In an embodiment of the present invention, the range of the cooling supplementary temperature difference setting value Δt1 is set to be determined by the fan heat load and the duct heat load. As an optional example, according to experience, the temperature increased by the fan heat load is about 1°C, and the temperature increased by the duct heat load is about 1°C, so the cooling supplementary temperature difference setting value Δt1 is set to 2°C by default.

[0111] In an embodiment of the present invention, the value range of the heating supplementary temperature difference setting value Δt2 is set to be determined by the fan heat load and the duct heat load. As an optional example, according to experience, the temperature of the fan heat load increase is about 1°C, and the temperature of the duct cooling load decreases is about -1°C, so the heating supplementary temperature difference setting value Δt2 is set to 0°C by default.

[0112] As an optional embodiment, in step S106, based on the temperature setting value Tsp and the humidity setting value Hsp, a binary search loop iterative calculation method is adopted to continuously narrow the search interval of the target dew point temperature value and approach the target dew point temperature value, so as to quickly and accurately find the target dew point temperature value Tdsp.

[0113] Combination Figure 4 As shown, the process of quickly finding the target dew point temperature value Tdsp is exemplarily shown, which includes the following steps:

[0114] Step 1: Calculate the absolute moisture content ABpv according to the temperature setting value Tsp and the humidity setting value Hsp;

[0115] Step 2: Initialize the high and low temperature ranges to (f(a), f(b)), where f(a) represents the low temperature value and f(b) represents the high temperature value; the initial value of f(a) is set to the preset temperature negative value K, the initial value of f(b) is set to the temperature setting value Tsp, and the initial high and low temperature ranges are (K, Tsp);

[0116] Step 3: Calculate the absolute humidity value ABspi based on the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and 100% as the relative humidity;

[0117] Step 4: According to the high and low temperature intervals corresponding to the current calculated absolute moisture content value ABspi, determine the average value f(x) of the high temperature value and the low temperature value, and according to the comparison result of the absolute moisture content calculated value ABspi and the absolute moisture content ABpv, replace one of the high temperature value and the low temperature value with the average value f(x), and update the high and low temperature intervals;

[0118] Step 5: Repeat steps 3-4 N times, and take the average value f(x) of the last output low temperature value f(a) and high temperature value f(b) as the dew point temperature target value.

[0119] As an optional embodiment, the absolute moisture content ABpv is calculated according to the temperature setting value Tsp and the humidity setting value Hsp, including:

[0120] Absolute moisture content ABpv = 0.6219*0.01*Hsp*Pv1 / (101326-0.018Hsp*Pv1);

[0121] Where Pv1 = 611.2e [(18678-Tsp / 234.5) / Tsp] / (Tsp+257.14) ;

[0122] Wherein, Pv1 represents the saturated pressure of water vapor at the temperature setting value Tsp, the unit is Pa; the unit of the temperature setting value Tsp is ℃; the humidity setting value Hsp is a percentage value.

[0123] As an optional embodiment, in the above method, according to the high temperature value f(b) or the low temperature value f(a) as the calculation temperature, with 100% as the relative humidity, the absolute moisture content calculation value ABspi is calculated, including:

[0124] (1) Based on the high temperature value f(b) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi:

[0125] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0126] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / (f(b)+257.14) ;

[0127] Where, Pv1 represents the saturated pressure of water vapor at the high temperature value f(b), the unit is Pa; the unit of the high temperature value f(b) is ℃;

[0128] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute humidity value ABspi:

[0129] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0130] Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / (f(a)+257.14) ;

[0131] Wherein, Pv1 represents the saturated pressure of water vapor at the low temperature f(a), the unit is Pa; the unit of the low temperature f(a) is ℃.

[0132] As an optional embodiment, in the aforementioned method, according to the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, one of the high temperature value and the low temperature value is replaced by the average value f(x), and the high and low temperature ranges are updated, including:

[0133] If the absolute moisture content calculation value ABspi is greater than the absolute moisture content comparison result ABpv, the high temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated high temperature value, and the high and low temperature ranges are updated in combination with the low temperature value that has not been replaced;

[0134] If the calculated absolute moisture content ABspi is less than the comparison result of the absolute moisture content ABpv, the low temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated low temperature value, and the high and low temperature ranges are updated in combination with the high temperature value that has not been replaced.

[0135] It can be seen that since the absolute humidity content ABpv is a calculation result based on the expected temperature and relative humidity, whether the cyclic iterative calculation starts from the high temperature value or the low temperature value, its purpose is to compare the calculated absolute humidity content with the expected absolute humidity content ABpv, and update the high temperature value or the low temperature value according to the comparison result, so that the high and low temperature ranges are narrowed after each calculation, and the dew point temperature target value is continuously approached. Finally, after multiple cyclic iterative calculations, the dew point temperature target value is obtained quickly and accurately.

[0136] Combination Figure 4 In the process shown, the larger the value of the number of cycles N is, the more the number of cycle calculations is, and the more accurate the dew point temperature target value is. In the embodiment of the present invention, considering the accuracy and calculation time, the value range of N is 10-30 times. In this example, the value is 15.

[0137] In the embodiment of the present invention, it should be understood that the aforementioned preset temperature negative value K can be selected according to the actual application scenario. For example, in this example, according to the application in the atmospheric environment, the preset temperature negative value K is -30°C.

[0138] like Figure 5 As shown in FIG. 1 , an exemplary application environment of a dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system is shown. Figure 5 In the embodiment, the control system 100 of the air-conditioning system can obtain the temperature and humidity set values ​​set by the user, the return air temperature value and the return air humidity value collected by the dry-bulb sensor, the dynamic temperature set value determined based on the temperature set value and the return air temperature value, the target dew point temperature value determined based on the temperature and humidity set values ​​set by the user, and the operation mode and the direct expansion control word under the mode set by the user. Based on this, the control system 100 of the air-conditioning system dynamically configures the temperature control target value according to the operation mode and the direct expansion control word under the mode set by the user, and outputs the temperature control target value Tcsp after cooling.

[0139] Accordingly, the control system 100 of the air-conditioning system is configured with a closed-loop control module, and can adopt classic control algorithms such as PI control algorithm or PID closed-loop control algorithm, etc., with the output temperature control target value Tcsp after surface cooling as the target value, and the current value of the temperature after surface cooling Tcpv as the current value, and the frequency of the variable frequency compressor of the air-conditioning system is adjusted through closed-loop control.

[0140] In the embodiment of the present invention, the control system 100 of the air conditioning system can be implemented based on a PLC control system, or based on a computer system having a processor and a memory. The computer system can be implemented through a server, or through a terminal, or through an interactive system between a terminal and a server.

[0141] like Figure 6 As shown, the architecture design of the computer system is exemplarily represented. This example takes a computer system of terminal architecture as an example, which includes a processor, a memory, an output device, an output device, a communication module and an I / O interface (i.e., an input / output interface). Among them, the processor and the memory are connected and communicated with data through a system bus. The output device, the output device, and the communication module are all connected to the system bus through an I / O interface.

[0142] It should be understood that the processor of a computer system is used to provide core computing and control capabilities. Memory includes non-volatile memory and cache. Non-volatile memory is used to store operating systems, computer software programs and databases. Cache is a high-speed read-write memory, usually integrated with the processor, providing a high-speed cache environment for the operation of the operating system and computer software programs in the non-volatile memory.

[0143] The aforementioned non-volatile memory can store instructions that can be processed, called and executed. When these instructions are executed by the processor, the process of the dynamic energy-saving control method of the variable frequency air handling unit of the above-mentioned air-conditioning system is realized.

[0144] It should be understood that in the process of executing the instructions to implement the dynamic energy-saving control method of the variable frequency air handling unit of the above-mentioned air-conditioning system, the input parameters and output parameters used are all stored in the non-volatile memory, including but not limited to the temperature and humidity set values ​​set by the user, the return air temperature value and the return air humidity value collected by the dry-bulb sensor, the dynamic temperature set value determined based on the temperature set value and the return air temperature value, the target dew point temperature value determined based on the temperature and humidity set values ​​set by the user, the operating mode set by the user and the direct expansion control word under the mode, and the dynamically configured temperature control target value, etc.

[0145] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of an exemplary partial structure of a computer system and does not constitute a limitation on the application environment of the present application scheme. A specific computer system may include more or fewer components than those shown in the figure, or combine certain components, or have a different layout.

[0146] Example 2

[0147] Combination Figure 7 As shown, it is exemplarily shown according to Figure 1 The dynamic energy-saving control method for the variable frequency air handling unit of the air conditioning system of the embodiment is designed to provide a dynamic energy-saving control device for the variable frequency air handling unit of the air conditioning system, which comprises:

[0148] The surface cooling temperature acquisition module 111 is used to obtain the current value Tcpv of the surface cooling temperature;

[0149] A user setting value acquisition module 112, used to acquire a temperature setting value Tsp and a humidity setting value Hsp input by a user;

[0150] The air conditioning return air parameter acquisition module 113 is used to obtain the return air temperature value Tpv and the return air humidity value Hpv detected by the return air temperature and humidity sensor located on the return air side of the air conditioning system;

[0151] The air conditioning system operation mode acquisition module 114 is used to acquire the operation mode of the air conditioning system set by the user, where the operation mode includes one of cooling, heating or ventilation;

[0152] A direct expansion control word acquisition module 115 is used to acquire a direct expansion control word of a cooling mode or a heating mode set by a user;

[0153] A target dew point temperature value finding module 116, used for finding a target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp;

[0154] A dynamic temperature setting value finding module 117, used to find a dynamic temperature setting value Tdysp based on the return air temperature value Tpv and the temperature setting value Tsp;

[0155] The temperature control target value dynamic configuration module 118 is used to dynamically configure the temperature control target value Tcsp after the air conditioning system is cooled according to the temperature setting value Tsp, the return air temperature value Tpv, the dynamic temperature setting value Tdysp and the target dew point temperature value Tdsp based on the operation mode set by the user and the direct expansion control word under the corresponding operation mode;

[0156] The closed-loop control module 119 is used to adjust the frequency of the variable frequency compressor of the air-conditioning system through closed-loop control, using the temperature control target value Tcsp after surface cooling as the target value and the current value Tcpv of the temperature after surface cooling as the current value.

[0157] In the exemplary embodiment, the dynamic temperature setting value finding module 117 is configured to find the dynamic temperature setting value Tdysp based on the return air temperature value Tpv and the temperature setting value Tsp according to different operation modes of the air conditioning system, specifically including:

[0158] Tdysp=Tsp-Δt;

[0159] Δt=Tpv-Tsp;

[0160] Wherein, Δta represents the deviation of the temperature setting value in cooling or heating mode.

[0161] In the exemplary embodiment, the temperature control target value dynamic configuration module 118 is configured to respond to the operation mode of the air-conditioning system set by the user as cooling, and the direct expansion control word set by the user in the cooling mode is one of dehumidification, constant temperature setting, and dynamic temperature setting, and then determine the temperature control target value Tcsp in the following manner:

[0162] When the operation mode = cooling, and the cooling mode direct expansion control word = dehumidification, Tcsp = Tdsp;

[0163] When the operation mode = cooling, and the cooling mode direct expansion control word = constant temperature setting, Tcsp = Tsp-Δt1;

[0164] When the operation mode = cooling, and the cooling mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp-Δt1;

[0165] Wherein, the Δt1 represents the refrigeration supplementary temperature difference setting value.

[0166] In the exemplary embodiment, the temperature control target value dynamic configuration module 118 is configured to respond to the operation mode of the air-conditioning system set by the user as heating, and the direct expansion control word set by the user in the heating mode is one of a constant temperature setting and a dynamic temperature setting, and then determine the temperature control target value Tcsp in the following manner:

[0167] When the operation mode = heating, and the heating mode direct expansion control word = constant temperature setting, Tcsp = Tsp + Δt2;

[0168] When the operation mode = heating, and the heating mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp + Δt2;

[0169] Wherein, the Δt2 represents the heating supplementary temperature difference setting value.

[0170] In an embodiment of the present invention, the range of the cooling supplementary temperature difference setting value Δt1 is set to be determined by the fan heat load and the duct heat load. As an optional example, according to experience, the temperature increased by the fan heat load is about 1°C, and the temperature increased by the duct heat load is about 1°C, so the cooling supplementary temperature difference setting value Δt1 is set to 2°C by default.

[0171] In an embodiment of the present invention, the value range of the heating supplementary temperature difference setting value Δt2 is set to be determined by the fan heat load and the duct heat load. As an optional example, according to experience, the temperature of the fan heat load increase is about 1°C, and the temperature of the duct cooling load decreases is about -1°C, so the heating supplementary temperature difference setting value Δt2 is set to 0°C by default.

[0172] As an optional embodiment, the aforementioned target dew point temperature value search module 116 is configured to adopt a binary search loop iterative calculation method, and performs loop iterative calculations based on the temperature setting value Tsp and the humidity setting value Hsp, continuously narrowing the search interval of the target dew point temperature value, and approaching the target dew point temperature value, thereby realizing fast and accurate search for the target dew point temperature value Tdsp.

[0173] As one of the embodiments, the target dew point temperature value finding module 116 is configured to quickly find the target dew point temperature value Tdsp according to the following process:

[0174] Step 1: Calculate the absolute moisture content ABpv according to the temperature setting value Tsp and the humidity setting value Hsp;

[0175] Step 2: Initialize the high and low temperature ranges to (f(a), f(b)), where f(a) represents the low temperature value and f(b) represents the high temperature value; the initial value of f(a) is set to the preset temperature negative value K, the initial value of f(b) is set to the temperature setting value Tsp, and the initial high and low temperature ranges are (K, Tsp);

[0176] Step 3: Calculate the absolute humidity value ABspi based on the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and 100% as the relative humidity;

[0177] Step 4: According to the high and low temperature intervals corresponding to the current calculated absolute moisture content value ABspi, determine the average value f(x) of the high temperature value and the low temperature value, and according to the comparison result of the absolute moisture content calculated value ABspi and the absolute moisture content ABpv, replace one of the high temperature value and the low temperature value with the average value f(x), and update the high and low temperature intervals;

[0178] Step 5: Repeat steps 3-4 N times, and take the average value f(x) of the last output low temperature value f(a) and high temperature value f(b) as the dew point temperature target value.

[0179] As an optional embodiment, the absolute moisture content ABpv is calculated according to the temperature setting value Tsp and the humidity setting value Hsp, including:

[0180] Absolute moisture content ABpv = 0.6219*0.01*Hsp*Pv1 / (101326-0.018Hsp*Pv1);

[0181] Where Pv1 = 611.2e [(18678-Tsp / 234.5) / Tsp] / (Tsp+257.14) ;

[0182] Wherein, Pv1 represents the saturated pressure of water vapor at the temperature setting value Tsp, the unit is Pa; the unit of the temperature setting value Tsp is ℃; the humidity setting value Hsp is a percentage value.

[0183] As an optional embodiment, the absolute moisture content calculation value ABspi is calculated based on the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and 100% as the relative humidity, including:

[0184] (1) Based on the high temperature value f(b) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi:

[0185] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0186] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / (f(b)+257.14) ;

[0187] Where, Pv1 represents the saturated pressure of water vapor at the high temperature value f(b), the unit is Pa; the unit of the high temperature value f(b) is ℃;

[0188] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute humidity value ABspi:

[0189] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0190] Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / (f(a)+257.14) ;

[0191] Wherein, Pv1 represents the saturated pressure of water vapor at the low temperature f(a), the unit is Pa; the unit of the low temperature f(a) is ℃.

[0192] As an optional embodiment, according to the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, one of the high temperature value and the low temperature value is replaced by the average value f(x), and the high and low temperature ranges are updated, including:

[0193] If the absolute moisture content calculation value ABspi is greater than the absolute moisture content comparison result ABpv, the high temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated high temperature value, and the high and low temperature ranges are updated in combination with the low temperature value that has not been replaced;

[0194] If the calculated absolute moisture content ABspi is less than the comparison result of the absolute moisture content ABpv, the low temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated low temperature value, and the high and low temperature ranges are updated in combination with the high temperature value that has not been replaced.

[0195] Based on the design of the target dew point temperature value finding module 116, since the absolute moisture content ABpv is a calculation result based on the expected temperature and relative humidity, whether the cyclic iterative calculation is started from the high temperature value or the low temperature value, the purpose is to compare the calculated absolute moisture content with the expected absolute moisture content ABpv, and update the high temperature value or the low temperature value according to the comparison result, so that the high and low temperature ranges are narrowed after each calculation, and the dew point temperature target value is continuously approached. Finally, after multiple cyclic iterative calculations, the dew point temperature target value is obtained quickly and accurately.

[0196] In this embodiment, the larger the value of the configured number of cycles N is, the more cycles are calculated, and the more accurate the dew point temperature target value is. As an example, considering the accuracy and calculation time, the value range of N is 10-30 times. In this example, the value is 15.

[0197] In this embodiment, the aforementioned preset temperature negative value K can be selected according to the actual application scenario. For example, in this example, according to the application in the atmospheric environment, the preset temperature negative value K is -30°C.

[0198] Example 3

[0199] Combination Figure 8 As shown, according to an embodiment disclosed in the present invention, a method for quickly determining the dew point temperature value in the current state is also proposed, which includes the following steps:

[0200] Step 1: Calculate the absolute humidity content ABpv under the current state according to the current temperature and humidity on the return air side of the air conditioning system, that is, the return air temperature value Tpv and the return air humidity value Hpv;

[0201] Step 2: Initialize the high and low temperature ranges to (f(a), f(b)), where f(a) represents the low temperature value and f(b) represents the high temperature value; the initial value of f(a) is set to the preset temperature negative value K, the initial value of f(b) is set to the return air temperature value Tpv, and the initial high and low temperature ranges are (K, Tpv);

[0202] Step 3: Calculate the absolute humidity value ABspi based on the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and 100% as the relative humidity;

[0203] Step 4: According to the high and low temperature intervals corresponding to the current calculated absolute moisture content value ABspi, determine the average value f(x) of the high temperature value and the low temperature value; according to the comparison result between the absolute moisture content value ABspi and the absolute moisture content ABpv in the current state, replace one of the high temperature value and the low temperature value with the average value f(x), and update the high and low temperature intervals;

[0204] Step 5: Repeat steps 3-4 N times, and take the average value f(x) of the last output low temperature value f(a) and high temperature value f(b) as the dew point temperature target value.

[0205] As an optional embodiment, the absolute humidity content ABpv in the current state is calculated according to the return air temperature value Tpv and the return air humidity value Hpv, including:

[0206] Absolute moisture content ABpv = 0.6219*0.01*Hpv*Pv1 / (101326-0.018Hpv*Pv1);

[0207] Where Pv1 = 611.2e [(18678-Tpv / 234.5) / Tpv] / (Tpv+257.14) ;

[0208] Wherein, Pv1 represents the saturated pressure of water vapor at the return air temperature value Tpv, in units of Pa; the temperature setting value Tpv is in units of °C; and the humidity setting value Hpv is a percentage value.

[0209] As an optional embodiment, in the above method, according to the high temperature value f(b) or the low temperature value f(a) as the calculation temperature, with 100% as the relative humidity, the absolute moisture content calculation value ABspi is calculated, including:

[0210] (1) Based on the high temperature value f(b) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi:

[0211] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0212] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / (f(b)+257.14) ;

[0213] Where, Pv1 represents the saturated pressure of water vapor at the high temperature value f(b), the unit is Pa; the unit of the high temperature value f(b) is ℃;

[0214] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute humidity value ABspi:

[0215] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0216] Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / (f(a)+257.14) ;

[0217] Wherein, Pv1 represents the saturated pressure of water vapor at the low temperature f(a), the unit is Pa; the unit of the low temperature f(a) is ℃.

[0218] As an optional embodiment, in the aforementioned method, according to the comparison result between the absolute moisture content calculation value ABspi and the absolute moisture content ABpv in the current state, one of the high temperature value and the low temperature value is replaced by the average value f(x), and the high and low temperature ranges are updated, including:

[0219] If the absolute moisture content calculation value ABspi is greater than the absolute moisture content ABpv comparison result in the current state, the high temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated high temperature value, and the high and low temperature ranges are updated in combination with the low temperature value that has not been replaced;

[0220] If the calculated absolute moisture content ABspi is less than the absolute moisture content ABpv comparison result in the current state, the low temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated low temperature value, and the high and low temperature ranges are updated in combination with the high temperature value that has not been replaced.

[0221] It can be seen that since the absolute humidity content ABpv in the current state is the result of the calculation based on the temperature and humidity in the current state, whether the cyclic iterative calculation starts from the high temperature value or the low temperature value, the purpose is to compare the calculated absolute humidity content with the absolute humidity content ABpv in the current state, and update the high temperature value or the low temperature value according to the comparison result, so that the high and low temperature ranges are narrowed after each calculation, and the dew point temperature is constantly approached. Finally, after multiple cyclic iterative calculations, the dew point temperature value is obtained quickly and accurately.

[0222] In this example, the larger the value of the number of cycles N is, the more cycles are calculated, and the more accurate the dew point temperature value is. In the embodiment of the present invention, considering the accuracy and calculation time, the value range of N is preferably 10-30 times.

[0223] In the embodiment of the present invention, it should be understood that the aforementioned preset temperature negative value K can be selected according to the actual application scenario. For example, in this example, according to the application in the atmospheric environment, the preset temperature negative value K is -30°C.

[0224] Example 4

[0225] Combination Fig. 9 As shown, it is exemplarily shown according to Figure 8 The method for quickly determining the dew point temperature value in the current state of the embodiment is designed to quickly determine the dew point temperature value in the current state. The method device comprises:

[0226] The absolute humidity calculation module 311 is used to calculate the absolute humidity ABpv in the current state according to the current temperature and humidity of the return air side of the air conditioning system, that is, the return air temperature value Tpv and the return air humidity value Hpv;

[0227] The high and low temperature interval initialization module 312 is used to initialize the high and low temperature intervals to (f(a), f(b)), where f(a) represents a low temperature value and f(b) represents a high temperature value; wherein the initial value of f(a) is set to a preset temperature negative value K, and the initial value of f(b) is set to a return air temperature value Tpv, and the initial high and low temperature intervals are (K, Tpv);

[0228] The absolute moisture content calculation value calculation module 313 is used to calculate the absolute moisture content calculation value ABspi according to the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and 100% as the relative humidity;

[0229] The high and low temperature interval iteration update module 314 is used to determine the average value f(x) of the high temperature value and the low temperature value according to the high and low temperature interval corresponding to the current calculated absolute moisture content calculation value ABspi, replace one of the high temperature value and the low temperature value with the average value f(x) according to the comparison result between the absolute moisture content calculation value ABspi and the absolute moisture content ABpv in the current state, and update the high and low temperature intervals;

[0230] The dew point temperature value output module 315 is used to cycle the above-mentioned absolute moisture content calculation value N times and update the new high and low temperature range operations according to the comparison result between the absolute moisture content ABpv and the current state, and take the average value f(x) of the last output low temperature value f(a) and the high temperature value f(b) as the dew point temperature target value.

[0231] As an optional embodiment, the absolute humidity calculation module 311 is configured to calculate the absolute humidity ABpv in the current state according to the return air temperature value Tpv and the return air humidity value Hpv, including:

[0232] Absolute moisture content ABpv = 0.6219*0.01*Hpv*Pv1 / (101326-0.018Hpv*Pv1);

[0233] Where Pv1 = 611.2e [(18678-Tpv / 234.5) / Tpv] / (Tpv+257.14) ;

[0234] Wherein, Pv1 represents the saturated pressure of water vapor at the return air temperature value Tpv, in units of Pa; the temperature setting value Tpv is in units of °C; and the humidity setting value Hpv is a percentage value.

[0235] As an optional embodiment, the absolute moisture content calculation value calculation module 313 is configured to calculate the absolute moisture content calculation value ABspi based on the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and 100% as the relative humidity, including:

[0236] (1) Based on the high temperature value f(b) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi:

[0237] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0238] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / (f(b)+257.14) ;

[0239] Where, Pv1 represents the saturated pressure of water vapor at the high temperature value f(b), the unit is Pa; the unit of the high temperature value f(b) is ℃;

[0240] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute humidity value ABspi:

[0241] ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0242] Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / (f(a)+257.14) ;

[0243] Wherein, Pv1 represents the saturated pressure of water vapor at the low temperature f(a), the unit is Pa; the unit of the low temperature f(a) is ℃.

[0244] As an optional embodiment, the high and low temperature interval iterative update module 314 is configured to replace one of the high temperature value and the low temperature value with the average value f(x) according to the comparison result between the absolute moisture content calculation value ABspi and the absolute moisture content ABpv in the current state, and update the high and low temperature intervals, including:

[0245] If the absolute moisture content calculation value ABspi is greater than the absolute moisture content ABpv comparison result in the current state, the high temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated high temperature value, and the high and low temperature ranges are updated in combination with the low temperature value that has not been replaced;

[0246] If the calculated absolute moisture content ABspi is less than the absolute moisture content ABpv comparison result in the current state, the low temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated low temperature value, and the high and low temperature ranges are updated in combination with the high temperature value that has not been replaced.

[0247] As an optional embodiment, the appropriate value range of N is 10-30 times.

[0248] As an optional embodiment, the aforementioned preset temperature negative value K can be selected according to the actual application scenario. For example, in this example, according to the application in the atmospheric environment, the preset temperature negative value K is -30°C.

[0249] Example 5

[0250] In combination with the above embodiments, according to the present disclosure, a computer system is also proposed, including:

[0251] one or more processors;

[0252] Memory stores instructions that can be operated.

[0253] Among them, when the aforementioned instructions are executed by one or more processors, the one or more processors perform operations, and the operations include the process of executing the method of any of the aforementioned embodiments, including but not limited to a dynamic energy-saving control method for a variable frequency air handling unit of an air-conditioning system, a method for quickly determining the dew point temperature value under the current state, and a process for quickly finding the target dew point temperature value.

[0254] Example 6

[0255] In combination with the above embodiments, according to the present disclosure, a computer-readable medium for storing software is also proposed, wherein the software includes instructions that can be executed by one or more computers, and when the instructions are executed by one or more computers, the process of executing the method of any of the aforementioned embodiments is performed, including but not limited to a dynamic energy-saving control method for a variable frequency air handling unit of an air-conditioning system, a method for quickly determining the dew point temperature value under the current state, and a process for quickly finding the target dew point temperature value.

[0256] Example 6

[0257] In combination with the above embodiments, according to the present disclosure, a computer program product is also proposed, including a computer program. When the computer program is executed by a processor, a process of implementing a method of any of the above embodiments is implemented, including but not limited to a dynamic energy-saving control method of a variable frequency air handling unit of an air conditioning system, a method for quickly determining a dew point temperature value in a current state, and a process of quickly finding a target dew point temperature value.

[0258] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system, characterized in that: The following steps are involved: Get the current value of the table temperature after cooling Tcpv; Get the temperature setting value Tsp and humidity setting value Hsp input by the user; Obtain the return air temperature value Tpv and the return air humidity value Hpv detected by the return air temperature and humidity sensor located on the return air side of the air conditioning system; Acquire an operation mode of the air conditioning system set by a user, where the operation mode includes one of cooling, heating or ventilation; Get the direct expansion control word of the cooling mode or heating mode set by the user; Based on the temperature setting value Tsp and the humidity setting value Hsp, finding the target dew point temperature value Tdsp; Based on the return air temperature value Tpv and the temperature setting value Tsp, find the dynamic temperature setting value Tdysp; Based on the operation mode set by the user and the direct expansion control word under the corresponding operation mode, the air conditioning system dynamically configures the temperature control target value Tcsp after surface cooling according to the temperature setting value Tsp, the return air temperature value Tpv, the dynamic temperature setting value Tdysp and the target dew point temperature value Tdsp; as well as The temperature control target value Tcsp after surface cooling is used as the target value, and the current value Tcpv of the temperature after surface cooling is used as the current value, and the frequency of the variable frequency compressor of the air-conditioning system is adjusted through closed-loop control.

2. The dynamic energy-saving control method for the variable frequency air handling unit of the air conditioning system according to claim 1, characterized in that: The method further comprises the following steps: In response to the operating mode of the air-conditioning system set by the user being cooling, and the direct expansion control word set by the user in the cooling mode being one of dehumidification, constant temperature setting, and dynamic temperature setting, the temperature control target value Tcsp is determined in the following manner: When the operation mode = cooling, and the cooling mode direct expansion control word = dehumidification, Tcsp = Tdsp; When the operation mode = cooling, and the cooling mode direct expansion control word = constant temperature setting, Tcsp = Tsp-Δt1; When the operation mode = cooling, and the cooling mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp-Δt1; Wherein, the Δt1 represents the refrigeration supplementary temperature difference setting value.

3. The dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system according to claim 1, characterized in that: In response to the operating mode of the air-conditioning system set by the user being heating, and the direct expansion control word set by the user in the heating mode is one of constant temperature setting and dynamic temperature setting, the temperature control target value Tcsp is determined in the following manner: When the operation mode = heating, and the heating mode direct expansion control word = constant temperature setting, Tcsp = Tsp + Δt2; When the operation mode = heating, and the heating mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp + Δt2; Wherein, the Δt2 represents the heating supplementary temperature difference setting value.

4. The dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system according to claim 2 or 3, characterized in that: When the operation mode of the air conditioning system is cooling or heating, based on the return air temperature value Tpv and the temperature setting value Tsp, finding the dynamic temperature setting value Tdysp includes: Tdysp=Tsp-Δt; Δt=Tpv-Tsp; Wherein, Δta represents the deviation of the temperature setting value in cooling or heating mode.

5. The dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system according to claim 1, characterized in that: The step of finding a target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp includes: Step 1, calculating the absolute moisture content ABpv according to the temperature setting value Tsp and the humidity setting value Hsp; Step 2, initialize the high and low temperature range to (f(a), f(b)), where f(a) represents the low temperature value and f(b) represents the high temperature value; the initial value of f(a) is set to the preset temperature negative value K, the initial value of f(b) is set to the temperature setting value Tsp, and the initial high and low temperature range is (K, Tsp); Step 3, using the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and taking 100% as the relative humidity, calculate the absolute moisture content value ABspi; Step 4: According to the high and low temperature intervals corresponding to the current calculated absolute moisture content value ABspi, determine the average value f(x) of the high temperature value and the low temperature value; according to the comparison result of the absolute moisture content value ABspi and the absolute moisture content ABpv, replace one of the high temperature value and the low temperature value with the average value f(x), and update the high and low temperature intervals; Step 5: Repeat steps 3-4 N times, and take the average value f(x) of the last output low temperature value f(a) and high temperature value f(b) as the dew point temperature target value.

6. The dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system according to claim 5, characterized in that: In the step 1, the absolute moisture content ABpv is calculated according to the temperature setting value Tsp and the humidity setting value Hsp, including: Absolute moisture content ABpv = 0.6219*0.01*Hsp*Pv1 / (101326-0.018Hsp*Pv1); Where Pv1 = 611.2e [(18678-Tsp / 234.5) / Tsp] / (Tsp+257.14) ; Wherein, Pv1 represents the saturated pressure of water vapor at the temperature setting value Tsp, the unit is Pa; the unit of the temperature setting value Tsp is ℃; the humidity setting value Hsp is a percentage value.

7. The dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system according to claim 5, characterized in that: In step 2, the absolute moisture content calculated value ABspi is calculated based on the high temperature value f(b) or the low temperature value f(a) as the calculation temperature and 100% as the relative humidity, including: (1) Based on the high temperature value f(b) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi: ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1); Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / (f(b)+257.14) ; Where, Pv1 represents the saturated pressure of water vapor at the high temperature value f(b), the unit is Pa; the unit of the high temperature value f(b) is ℃; (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute humidity value ABspi: ABspi=0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1); Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / (f(a)+257.14) ; Wherein, Pv1 represents the saturated pressure of water vapor at the low temperature f(a), the unit is Pa; the unit of the low temperature f(a) is ℃.

8. The dynamic energy-saving control method for a variable frequency air handling unit of an air conditioning system according to any one of claims 5, 6 and 7, characterized in that: In step 4, according to the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, one of the high temperature value and the low temperature value is replaced by the average value f(x), and the high and low temperature ranges are updated, including: If the absolute moisture content calculation value ABspi is greater than the absolute moisture content comparison result ABpv, the high temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated high temperature value, and the high and low temperature ranges are updated in combination with the low temperature value that has not been replaced; If the calculated absolute moisture content ABspi is less than the comparison result of the absolute moisture content ABpv, the low temperature value is replaced by the mean value f(x), and the mean value f(x) is used as the updated low temperature value, and the high and low temperature ranges are updated in combination with the high temperature value that has not been replaced.

9. A computer system, characterized in that: include: one or more processors; A memory storing operable instructions, wherein when the instructions are executed by the one or more processors, the one or more processors are caused to perform operations, wherein the operations include the process of executing the method described in any one of claims 1 to 8.

10. A computer-readable medium storing software, characterized in that: The software includes instructions that can be executed by one or more computers, and when the instructions are executed by the one or more computers, the process of the method according to any one of claims 1 to 8 is performed.

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