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

Abstract

The present invention provides a dynamic energy-saving control method, system, and medium for a variable-frequency air handling unit. The method comprises: obtaining a current value of a post-surface cooling temperature, a temperature setpoint and a humidity setpoint, a return air temperature, a return air humidity, a user-set operating mode of the air conditioning system, and a direct expansion control word. A target dew point temperature is found based on the temperature setpoint and the humidity setpoint; a dynamic temperature setpoint is found based on the return air temperature and the temperature setpoint; based on the operating mode and the direct expansion control word, the air conditioning system dynamically configures a post-surface cooling temperature control target value according to the temperature setpoint, the return air temperature, the dynamic temperature setpoint, and the target dew point temperature; and finally, adjusting the frequency of the variable-frequency compressor of the air conditioning system through closed-loop control, using the post-surface cooling temperature control target value as the target value and the current post-surface cooling temperature value as the current value.

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 more 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 variable-frequency air handling units (VHUs) in terminal air conditioning systems, the unit's surface cooling (i.e., surface cooler) fulfills different functional requirements depending on geographic location or customer settings. Some units require dehumidification in the summer, and the surface cooling section of the dehumidification unit performs this function. During dehumidification, the relative humidity after surface cooling can reach 100%. Sensors in high-humidity environments are easily damaged, so PT100 or PT1000 temperature sensors are suitable. In these cases, dehumidification can be achieved by controlling the surface cooling temperature to the set dew point. Therefore, how to quickly and accurately calculate the unit's dew point temperature in the control system becomes crucial for effective dehumidification. Existing methods use table lookup or trial and error algorithms to find the dew point temperature. When a value not included in the table appears, the table lookup method uses a nearby value to estimate it, resulting in low accuracy. The trial and error algorithm requires a large amount of computation, and the calculation is performed continuously by increasing or decreasing the gradient value. This requires a relatively low computing resource requirement, low number of calculations, and low efficiency. Moreover, 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 temperature setting value, the return air temperature value, the dynamic temperature setting value and the dew point temperature target value. Based on this, 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 for a variable frequency air handling unit of an air conditioning system according to the first aspect comprises the following steps:

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

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

[0007] Obtain the return air temperature value Tpv and 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] Obtaining an operating mode of the air conditioning system set by a user, where the operating 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] Finding a target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp;

[0011] Finding a dynamic temperature setting value Tdysp based on the return air temperature value Tpv and the temperature setting value Tsp;

[0012] Based on the user-set operating mode and the DX control word in the corresponding operating mode, the air conditioning system dynamically configures the temperature control target value Tcsp after surface cooling according to the temperature set value Tsp, the return air temperature value Tpv, the dynamic temperature set 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 embodiment, 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 as follows:

[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 cooling supplementary temperature difference setting value.

[0020] As an optional embodiment, in response to the user setting the operating mode of the air-conditioning system to heating, and the user setting the direct expansion control word in the heating mode to be one of constant temperature setting and dynamic temperature setting, the temperature control target value Tcsp is determined as follows:

[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 direct expansion control word of the heating mode = dynamic temperature setting, Tcsp = Tdysp + Δt2;

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

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

[0025] Tdysp = Tsp - Δt;

[0026] Δt = Tpv - Tsp;

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

[0028] As an optional implementation manner, 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: Calculate 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 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 negative value of the preset temperature K, and the initial value of f(b) is set to the temperature setting value Tsp. The initial high and low temperature ranges are (K, Tsp).

[0031] Step 3: Calculate the absolute moisture content 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;

[0032] Step 4: Determine the average value f(x) of the high and low temperature ranges corresponding to the current absolute moisture content calculation value ABspi. Replace one of the high and low temperature values ​​with the average value f(x) based on the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, and update the high and low temperature ranges.

[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 embodiment, the 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] Where Pv1 represents the saturated pressure of water vapor at the temperature setting value Tsp, in Pa; the temperature setting value Tsp is in °C; and the humidity setting value Hsp is a percentage value.

[0038] As an optional embodiment, 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 °C;

[0043] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content 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] Where Pv1 represents the saturated pressure of water vapor at the low temperature f(a), and the unit is Pa; the unit of the low temperature f(a) is ℃.

[0047] As an optional implementation, in the aforementioned step 4, based on the comparison result of the absolute moisture content calculated 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 intervals are updated in combination with the low temperature value that has not been replaced;

[0049] If the absolute moisture content calculation value ABspi is less than the absolute moisture content ABpv comparison result, the low temperature value is replaced by the mean f(x), and the mean 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 of any state point dropping to the dew point temperature, a rapid cycle calculation using a dichotomy 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 includes the following steps:

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

[0053] 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 negative value of the preset temperature K, and the initial value of f(b) is set to the temperature setting value Tsp. The initial high and low temperature ranges are (K, Tsp).

[0054] Step 3: Calculate the absolute moisture content 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;

[0055] Step 4: Determine the average value f(x) of the high and low temperature ranges corresponding to the current absolute moisture content calculation value ABspi. Replace one of the high and low temperature values ​​with the average value f(x) based on the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, and update the high and low temperature ranges.

[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 embodiment, based on the comparison result of the absolute moisture content calculated 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 intervals are updated in combination with the low temperature value that has not been replaced;

[0059] If the absolute moisture content calculation value ABspi is less than the absolute moisture content ABpv comparison result, the low temperature value is replaced by the mean f(x), and the mean 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, including 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 comprises 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 of 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, then 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, achieving the effect of rapid cooling. This dynamic change in temperature is after the cooling effect of the compressor is released, causing the current value to change, and the temperature will change dynamically.

[0066] Compared with other existing control methods that adjust the dynamic change of the temperature setting value according to the time period, in the existing methods, although the compressor has not been put into use or has not released energy for a long time, the temperature setting value has changed due to the time judgment period, thus causing overshoot. The dynamic temperature setting proposed by 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 dynamically changes 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 for a variable frequency air handling unit of an air-conditioning system proposed in the present invention is particularly applicable to the control of an air-conditioning system in a clean environment.

[0068] The method proposed in the present invention for rapidly obtaining a target dew point temperature value uses a binary search method to rapidly loop through calculations based on the user-set temperature and target relative humidity. Based on the principle that the absolute moisture content remains constant as the temperature at any point decreases to the dew point, the method dynamically updates the dew point temperature range by comparing the result with the absolute moisture content. This loop continuously narrows and approximates the dew point temperature, enabling rapid and accurate setting of the target dew point temperature value and improving the control efficiency and accuracy of dehumidification operation in cooling mode. Compared to existing pilot algorithms and table lookup methods, the method proposed in the present invention for rapidly obtaining a target dew point temperature value consumes less computing resources, determines the dew point temperature value quickly, and achieves high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 1 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 2 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 2 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 rapidly 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 2 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 the dew point temperature value of the current state according to an embodiment of the present invention.

[0077] Figure 9 2 is a schematic diagram of a device for rapidly obtaining 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 below in conjunction with the accompanying drawings. Example 1

[0079] Combine 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:

[0080] Step S101: obtaining the current value of the surface cooling temperature Tcpv;

[0081] Step S102: Obtaining the temperature setting value Tsp and the humidity setting value Hsp input by the user;

[0082] 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;

[0083] Step S104: obtaining an operating mode of the air-conditioning system set by the user, where the operating mode includes one of cooling, heating, or ventilation;

[0084] Step S105: obtaining the direct expansion control word of the cooling mode or heating mode set by the user;

[0085] Step S106: Finding a target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp;

[0086] Step S107: Finding a dynamic temperature setting value Tdysp based on the return air temperature value Tpv and the temperature setting value Tsp;

[0087] Step S108: Based on the operating mode set by the user and the direct expansion control word in the corresponding operating mode, the air conditioning system dynamically configures the temperature control target value Tcsp after surface cooling according to the temperature set value Tsp, the return air temperature value Tpv, the dynamic temperature set value Tdysp, and the target dew point temperature value Tdsp; and

[0088] Step S109: Using the temperature control target value Tcsp after surface cooling as the target value and the current temperature value Tcpv 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.

[0089] In an embodiment of the present invention, the current value of the surface cooling temperature Tcpv 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.

[0090] A return air temperature and humidity sensor, such as a dry-bulb and wet-bulb sensor, is installed 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.

[0091] 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.

[0092] 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:

[0093] Tdysp = Tsp - Δt;

[0094] Δt = Tpv - Tsp;

[0095] Wherein, Δt represents the deviation of the temperature setting value in cooling or heating mode.

[0096] As an optional embodiment, the method further includes the following steps:

[0097] 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 as follows:

[0098] When the operation mode = cooling, and the cooling mode direct expansion control word = dehumidification, Tcsp = Tdsp;

[0099] When the operation mode = cooling, and the cooling mode direct expansion control word = constant temperature setting, Tcsp = Tsp - Δt1;

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

[0101] Wherein, the Δt1 represents the cooling supplementary temperature difference setting value.

[0102] As an optional embodiment, in response to the user setting the operating mode of the air-conditioning system to heating, and the user setting the direct expansion control word in the heating mode to be one of constant temperature setting and dynamic temperature setting, the temperature control target value Tcsp is determined as follows:

[0103] When the operation mode = heating, and the heating mode direct expansion control word = constant temperature setting, Tcsp = Tsp + Δt2;

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

[0105] Wherein, the Δt2 represents the heating supplementary temperature difference setting value.

[0106] Figure 2 The figure shows an exemplary diagram of the setting principle 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 image temperature value of the current return air temperature and the set temperature value set by the user downward by Δt1.

[0107] Figure 3 The figure shows an exemplary diagram of the setting principle 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.

[0108] Therefore, in both cooling and heating modes, when the DX control word is set to dynamic, the post-cooling temperature setting dynamically changes based on the current temperature and the set temperature value, achieving rapid cooling. This dynamic temperature change is achieved by releasing the cooling effect of the DX compressor, causing the current value to change, and then the set temperature value to change dynamically. This not only achieves rapid cooling, but also ensures the stability and accuracy of the control process, preventing overshoot.

[0109] In an embodiment of the present invention, the range of the cooling supplementary temperature difference set value Δt1 is determined by the fan heat load and the duct heat load. As an optional example, based on experience, the temperature increase due to the fan heat load is approximately 1°C, and the temperature increase due to the duct heat load is approximately 1°C. Therefore, the cooling supplementary temperature difference set value Δt1 is set to 2°C by default.

[0110] In an embodiment of the present invention, the range of the heating supplementary temperature difference set value Δt2 is determined by the fan heat load and the duct heat load. As an optional example, based on experience, the temperature increase of the fan heat load is approximately 1°C, while the temperature decrease of the duct cooling load is approximately -1°C. Therefore, the heating supplementary temperature difference set value Δt2 is set to 0°C by default.

[0111] As an optional embodiment, in step S106, based on the temperature setting value Tsp and the humidity setting value Hsp, a binary 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 achieve fast and accurate search for the target dew point temperature value Tdsp.

[0112] Combine Figure 4 As shown in FIG, a process of quickly finding the target dew point temperature value Tdsp is exemplarily shown, which includes the following steps:

[0113] Step 1: Calculate the absolute moisture content ABpv based on the temperature setting value Tsp and the humidity setting value Hsp;

[0114] 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 negative value of the preset temperature K, and the initial value of f(b) is set to the temperature setting value Tsp. The initial high and low temperature ranges are (K, Tsp).

[0115] Step 3: Calculate the absolute moisture content 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;

[0116] Step 4: Determine the mean f(x) of the high and low temperature ranges corresponding to the current absolute moisture content calculation value ABspi. Replace one of the high and low temperature values ​​with the mean f(x) based on the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, and update the high and low temperature ranges.

[0117] 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.

[0118] 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:

[0119] Absolute moisture content ABpv = 0.6219*0.01*Hsp*Pv1 / (101326-0.018Hsp*Pv1);

[0120] Where Pv1 = 611.2e [(18678-Tsp / 234.5) / Tsp] / (Tsp+257.14) ;

[0121] Where Pv1 represents the saturated pressure of water vapor at the temperature setting value Tsp, in Pa; the temperature setting value Tsp is in °C; and the humidity setting value Hsp is a percentage value.

[0122] As an optional embodiment, in the aforementioned method, 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:

[0123] (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:

[0124] ABspi = 0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0125] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / ( f(b)+257.14) ;

[0126] 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 °C;

[0127] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi:

[0128] ABspi = 0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0129] Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / ( f(a)+257.14) ;

[0130] Where Pv1 represents the saturated pressure of water vapor at the low temperature f(a), and the unit is Pa; the unit of the low temperature f(a) is ℃.

[0131] As an optional embodiment, in the aforementioned method, based on the comparison result of the absolute moisture content calculated value ABspi and the absolute moisture content ABpv, replacing one of the high temperature value and the low temperature value with the average value f(x), and updating the high and low temperature ranges, includes:

[0132] 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 intervals are updated in combination with the low temperature value that has not been replaced;

[0133] If the absolute moisture content calculation value ABspi is less than the absolute moisture content ABpv comparison result, the low temperature value is replaced by the mean f(x), and the mean 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.

[0134] As can be seen from this, since the absolute moisture content ABpv is calculated based on the desired temperature and relative humidity, whether the iterative calculation starts from the high temperature value or the low temperature value, its purpose is to compare the calculated absolute moisture content with the expected absolute moisture content ABpv and update the high or low temperature value based on the comparison result. Therefore, after each calculation, the high and low temperature ranges are narrowed and the dew point temperature target value is continuously approached. Ultimately, after multiple iterative calculations, the dew point temperature target value is quickly and accurately obtained.

[0135] Combine Figure 4 In the process shown, a larger value for the number of cycles N results in more calculation cycles and a more accurate dew point temperature target value. In the embodiment of the present invention, considering both accuracy and calculation time, a value of N of 10-30 is appropriate. In this example, the value is 15.

[0136] 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.

[0137] like Figure 5 As shown in FIG, an example shows the application environment of the dynamic energy-saving control method of the variable frequency air handling unit of the air conditioning system. 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 and return air humidity values ​​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.

[0138] Based on this, the control system 100 of the air-conditioning system is configured with a closed-loop control module, which 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 adjust the frequency of the variable frequency compressor of the air-conditioning system through closed-loop control.

[0139] In an embodiment of the present invention, the control system 100 of the air conditioning system can be implemented based on a PLC control system or a computer system having a processor and a memory. The computer system can be implemented via a server, a terminal, or an interactive system between a terminal and a server.

[0140] like Figure 6 The figure shows an exemplary computer system architecture design. This example uses a terminal-based computer system as an example, which includes a processor, memory, output devices, a communication module, and an I / O interface (i.e., input / output interface). The processor and memory are connected and communicate data via a system bus. The output devices, output devices, and communication module are all connected to the system bus via an I / O interface.

[0141] It should be understood that a computer system's processor provides 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 typically integrated with the processor, providing a high-speed caching environment for the operating system and computer software programs stored in the non-volatile memory.

[0142] 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.

[0143] 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 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 value 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.

[0144] 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 solution. A specific computer system may include more or fewer components than shown in the figure, or combine certain components, or have a different layout. Example 2

[0145] Combine Figure 7 As shown, it is exemplarily shown according to Figure 1 The 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 is designed to provide a dynamic energy-saving control device for a variable frequency air handling unit of an air conditioning system, which includes:

[0146] The surface cooling temperature acquisition module 111 is used to obtain the current value Tcpv of the surface cooling temperature;

[0147] The user setting value acquisition module 112 is used to obtain the temperature setting value Tsp and the humidity setting value Hsp input by the user;

[0148] 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;

[0149] The air conditioning system operation mode acquisition module 114 is used to obtain the operation mode of the air conditioning system set by the user, where the operation mode includes one of cooling, heating or ventilation;

[0150] The direct expansion control word acquisition module 115 is used to obtain the direct expansion control word of the cooling mode or heating mode set by the user;

[0151] a target dew point temperature value finding module 116 for finding a target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp;

[0152] A dynamic temperature setting value finding module 117 is used to find a dynamic temperature setting value Tdysp based on the return air temperature value Tpv and the temperature setting value Tsp;

[0153] The temperature control target value dynamic configuration module 118 is used to dynamically configure the temperature control target value Tcsp after surface cooling based on the operating mode set by the user and the direct expansion control word in the corresponding operating mode, according to the temperature set value Tsp, the return air temperature value Tpv, the dynamic temperature set value Tdysp, and the target dew point temperature value Tdsp of the air conditioning system;

[0154] The closed-loop control module 119 is configured 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 temperature value Tcpv after surface cooling as the current value.

[0155] 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 operating modes of the air conditioning system, specifically including:

[0156] Tdysp = Tsp - Δt;

[0157] Δt = Tpv - Tsp;

[0158] Wherein, Δt represents the deviation of the temperature setting value in cooling or heating mode.

[0159] In an exemplary embodiment, the temperature control target value dynamic configuration module 118 is configured to determine the temperature control target value Tcsp in the following manner in response to the user setting the operating mode of the air conditioning system to cooling, and the user setting the direct expansion control word to one of dehumidification, constant temperature setting, and dynamic temperature setting in the cooling mode:

[0160] When the operation mode = cooling, and the cooling mode direct expansion control word = dehumidification, Tcsp = Tdsp;

[0161] When the operation mode = cooling, and the cooling mode direct expansion control word = constant temperature setting, Tcsp = Tsp - Δt1;

[0162] When the operation mode = cooling, and the cooling mode direct expansion control word = dynamic temperature setting, Tcsp = Tdysp - Δt1;

[0163] Wherein, the Δt1 represents the cooling supplementary temperature difference setting value.

[0164] In an exemplary embodiment, the temperature control target value dynamic configuration module 118 is configured to determine the temperature control target value Tcsp in the following manner in response to the user setting the operating mode of the air conditioning system to heating, and the user setting the direct expansion control word to be one of a constant temperature setting and a dynamic temperature setting in the heating mode:

[0165] When the operation mode = heating, and the heating mode direct expansion control word = constant temperature setting, Tcsp = Tsp + Δt2;

[0166] When the operation mode = heating, and the direct expansion control word of the heating mode = dynamic temperature setting, Tcsp = Tdysp + Δt2;

[0167] Wherein, the Δt2 represents the heating supplementary temperature difference setting value.

[0168] In an embodiment of the present invention, the range of the cooling supplementary temperature difference set value Δt1 is determined by the fan heat load and the duct heat load. As an optional example, based on experience, the temperature increase due to the fan heat load is approximately 1°C, and the temperature increase due to the duct heat load is approximately 1°C. Therefore, the cooling supplementary temperature difference set value Δt1 is set to 2°C by default.

[0169] In an embodiment of the present invention, the range of the heating supplementary temperature difference set value Δt2 is determined by the fan heat load and the duct heat load. As an optional example, based on experience, the temperature increase of the fan heat load is approximately 1°C, while the temperature decrease of the duct cooling load is approximately -1°C. Therefore, the heating supplementary temperature difference set value Δt2 is set to 0°C by default.

[0170] As an optional embodiment, the aforementioned target dew point temperature value search module 116 is configured to adopt a binary cyclic iterative calculation method, and perform cyclic iterative calculation 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, so as to achieve fast and accurate search for the target dew point temperature value Tdsp.

[0171] As one embodiment, 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:

[0172] Step 1: Calculate the absolute moisture content ABpv based on the temperature setting value Tsp and the humidity setting value Hsp;

[0173] 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 negative value of the preset temperature K, and the initial value of f(b) is set to the temperature setting value Tsp. The initial high and low temperature ranges are (K, Tsp).

[0174] Step 3: Calculate the absolute moisture content 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;

[0175] Step 4: Determine the mean f(x) of the high and low temperature ranges corresponding to the current absolute moisture content calculation value ABspi. Replace one of the high and low temperature values ​​with the mean f(x) based on the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, and update the high and low temperature ranges.

[0176] 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.

[0177] 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:

[0178] Absolute moisture content ABpv = 0.6219*0.01*Hsp*Pv1 / (101326-0.018Hsp*Pv1);

[0179] Where Pv1 = 611.2e [(18678-Tsp / 234.5) / Tsp] / (Tsp+257.14) ;

[0180] Where Pv1 represents the saturated pressure of water vapor at the temperature setting value Tsp, in Pa; the temperature setting value Tsp is in °C; and the humidity setting value Hsp is a percentage value.

[0181] As an optional embodiment, 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:

[0182] (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:

[0183] ABspi = 0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0184] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / ( f(b)+257.14) ;

[0185] 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 °C;

[0186] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi:

[0187] ABspi = 0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0188] Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / ( f(a)+257.14) ;

[0189] Where Pv1 represents the saturated pressure of water vapor at the low temperature f(a), and the unit is Pa; the unit of the low temperature f(a) is ℃.

[0190] As an optional embodiment, based on the comparison result of the absolute moisture content calculated 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:

[0191] 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 intervals are updated in combination with the low temperature value that has not been replaced;

[0192] If the absolute moisture content calculation value ABspi is less than the absolute moisture content ABpv comparison result, the low temperature value is replaced by the mean f(x), and the mean 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.

[0193] Based on the design of the target dew point temperature search module 116, since the absolute moisture content ABpv is calculated based on the desired temperature and relative humidity, whether the iterative calculation starts from the high or low temperature value, the purpose is to compare the calculated absolute moisture content with the expected absolute moisture content ABpv and update the high or low temperature value based on the comparison result. This narrows the high and low temperature range after each calculation and continuously approaches the target dew point temperature. Ultimately, after multiple iterative calculations, the target dew point temperature is quickly and accurately obtained.

[0194] In this embodiment, a larger value for the configured number of cycles N results in a greater number of calculation cycles and a more accurate dew point temperature target value. For example, considering both accuracy and calculation time, a suitable value for N is 10-30. In this example, the value is 15.

[0195] 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. Example 3

[0196] Combine 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:

[0197] Step 1: Calculate the absolute humidity ABpv under the current state based on 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;

[0198] 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 negative value of the preset temperature K, and the initial value of f(b) is set to the return air temperature value Tpv. The initial high and low temperature ranges are (K, Tpv).

[0199] Step 3: Calculate the absolute moisture content 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;

[0200] Step 4: Determine the mean f(x) of the high and low temperature ranges corresponding to the current absolute moisture content calculation value ABspi. Replace one of the high and low temperature values ​​with the mean f(x) based on the comparison between the absolute moisture content calculation value ABspi and the current absolute moisture content ABpv, and update the high and low temperature ranges.

[0201] 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.

[0202] 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:

[0203] Absolute moisture content ABpv = 0.6219*0.01*Hpv*Pv1 / (101326-0.018Hpv*Pv1);

[0204] Where Pv1 = 611.2e [(18678-Tpv / 234.5) / Tpv] / (Tpv+257.14) ;

[0205] Where Pv1 represents the saturated pressure of water vapor at the return air temperature Tpv, in Pa; the temperature setting value Tpv is in °C; and the humidity setting value Hpv is a percentage value.

[0206] As an optional embodiment, in the aforementioned method, 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:

[0207] (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:

[0208] ABspi = 0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0209] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / ( f(b)+257.14) ;

[0210] 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 °C;

[0211] (2) Based on the lowest temperature value f(a) as the calculation temperature and 100% as the relative humidity, calculate the absolute moisture content ABspi:

[0212] ABspi = 0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0213] Where Pv1 = 611.2e [(18678-f(a) / 234.5) / f(a)] / ( f(a)+257.14) ;

[0214] Where Pv1 represents the saturated pressure of water vapor at the low temperature f(a), and the unit is Pa; the unit of the low temperature f(a) is ℃.

[0215] As an optional embodiment, in the aforementioned method, based on the comparison result of the absolute moisture content calculated value ABspi and the absolute moisture content ABpv in the current state, replacing one of the high temperature value and the low temperature value with the average value f(x), and updating the high and low temperature ranges, includes:

[0216] 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;

[0217] If the absolute moisture content calculation value 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.

[0218] As can be seen from this, since the absolute humidity content ABpv in the current state is calculated based on the temperature and humidity in the current state, whether the iterative calculation starts from the high temperature value or the low temperature value, its purpose is to compare the calculated absolute humidity content value with the absolute humidity content ABpv in the current state and update the high temperature value or the low temperature value based on the comparison result. Therefore, after each calculation, the high and low temperature ranges are narrowed and the dew point temperature is continuously approached. Ultimately, after multiple iterative calculations, the dew point temperature value is quickly and accurately obtained.

[0219] 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 both accuracy and calculation time, the appropriate range of N is 10-30 times.

[0220] 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. Example 4

[0221] Combine Figure 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, which includes:

[0222] 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;

[0223] 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 the low temperature value and f(b) represents the high temperature value; wherein the initial value of f(a) is set to the preset temperature negative value K, and the initial value of f(b) is set to the return air temperature value Tpv, and the initial high and low temperature intervals are (K, Tpv);

[0224] The absolute moisture content calculation value calculation module 313 is used 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;

[0225] The high and low temperature interval iterative update module 314 is configured to determine the average value f(x) of the high and low temperature intervals corresponding to the current calculated absolute moisture content value ABspi, replace one of the high and low temperature values ​​with the average value f(x) based on a comparison result between the absolute moisture content value ABspi and the current absolute moisture content ABpv, and update the high and low temperature intervals.

[0226] The dew point temperature output module 315 is used to repeat the aforementioned absolute moisture content calculation N times and update the new high and low temperature ranges based on the comparison result with the absolute moisture content ABpv in the current state, 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.

[0227] 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:

[0228] Absolute moisture content ABpv = 0.6219*0.01*Hpv*Pv1 / (101326-0.018Hpv*Pv1);

[0229] Where Pv1 = 611.2e [(18678-Tpv / 234.5) / Tpv] / (Tpv+257.14) ;

[0230] Where Pv1 represents the saturated pressure of water vapor at the return air temperature Tpv, in Pa; the temperature setting value Tpv is in °C; and the humidity setting value Hpv is a percentage value.

[0231] 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:

[0232] (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:

[0233] ABspi = 0.6219*0.01*100%*Pv1 / (101326-0.018*100%*Pv1);

[0234] Where Pv1 = 611.2e [(18678-f(b) / 234.5) / f(b)] / ( f(b)+257.14) ;

[0235] 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 °C;

[0236] (2) Based on the lowest temperature value f(a) 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(a) / 234.5) / f(a)] / ( f(a)+257.14) ;

[0239] Where Pv1 represents the saturated pressure of water vapor at the low temperature f(a), and the unit is Pa; the unit of the low temperature f(a) is ℃.

[0240] As an optional embodiment, the high and low temperature interval iterative updating module 314 is configured to replace one of the high temperature value and the low temperature value with the average value f(x) based on the comparison result of the absolute moisture content calculated value ABspi and the absolute moisture content ABpv in the current state, and update the high and low temperature intervals, including:

[0241] 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;

[0242] If the absolute moisture content calculation value 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.

[0243] As an optional embodiment, the appropriate value range of N is 10-30 times.

[0244] 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. Example 5

[0245] In combination with the above embodiments, the present disclosure further provides a computer system, including:

[0246] one or more processors;

[0247] Memory stores instructions that can be operated.

[0248] In which, 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 of a variable frequency air handling unit of an air-conditioning system, a method for quickly determining the dew point temperature value in the current state, and a process for quickly finding the target dew point temperature value. Example 6

[0249] 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 in the current state, and a process for quickly finding the target dew point temperature value. Example 7

[0250] In conjunction with the above embodiments, the present disclosure further provides a computer program product, including a computer program. When executed by a processor, the computer program implements the process of any of the aforementioned methods, including but not limited to a dynamic energy-saving control method for a variable-frequency air handling unit in an air conditioning system, a method for rapidly determining a dew point temperature value in a current state, and a process for rapidly finding a target dew point temperature value.

[0251] While the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A dynamic energy-saving control method for a variable frequency air handling unit, 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 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; Obtaining an operating mode of the air conditioning system set by a user, where the operating mode includes one of cooling, heating, or ventilation; Obtain the direct expansion control word for the cooling mode or heating mode set by the user, wherein the direct expansion control word in the cooling mode is one of dehumidification, constant temperature setting, and dynamic temperature setting; and the direct expansion control word in the heating mode is one of constant temperature setting and dynamic temperature setting; Finding a target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp; Finding a dynamic temperature setting value Tdysp based on the return air temperature value Tpv and the temperature setting value Tsp; Based on the operating mode set by the user and the direct expansion control word in the corresponding operating mode, the air conditioning system dynamically configures the temperature control target value Tcsp after surface cooling according to the temperature set value Tsp, return air temperature value Tpv, dynamic temperature set value Tdysp and target dew point temperature value Tdsp; as well as The frequency of the variable frequency compressor of the air conditioning system is adjusted 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; The step of finding the target dew point temperature value Tdsp based on the temperature setting value Tsp and the humidity setting value Hsp specifically includes the following steps: Step 1: Calculate 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 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 negative value of the preset temperature K, and the initial value of f(b) is set to the temperature setting value Tsp. The initial high and low temperature ranges are (K, Tsp). Step 3: Calculate the absolute moisture content 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; Step 4: Determine the average value f(x) of the high and low temperature ranges corresponding to the current absolute moisture content calculation value ABspi. Replace one of the high and low temperature values ​​with the average value f(x) based on the comparison result of the absolute moisture content calculation value ABspi and the absolute moisture content ABpv, and update the high and low temperature ranges. 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 target dew point temperature value Tdsp.

2. The dynamic energy-saving control method of the variable frequency air handling unit 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, the temperature control target value Tcsp is determined as follows: 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 cooling supplementary temperature difference setting value.

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

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

5. The dynamic energy-saving control method of a variable frequency air handling unit according to claim 1, characterized in that: In 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) ; Where Pv1 represents the saturated pressure of water vapor at the temperature setting value Tsp, in Pa; the temperature setting value Tsp is in °C; and the humidity setting value Hsp is a percentage value.

6. The dynamic energy-saving control method of a variable frequency air handling unit according to claim 1, 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 °C; (2) Based on the lowest temperature value f(a) 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(a) / 234.5) / f(a)] / ( f(a)+257.14) ; Where Pv1 represents the saturated pressure of water vapor at the low temperature f(a), and the unit is Pa; the unit of the low temperature f(a) is ℃.

7. The dynamic energy-saving control method for a variable frequency air handling unit according to claim 5 or 6, characterized in that: In step 4, based on the comparison result of the absolute moisture content calculated 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 intervals are updated in combination with the low temperature value that has not been replaced; If the absolute moisture content calculation value ABspi is less than the absolute moisture content ABpv comparison result, the low temperature value is replaced by the mean f(x), and the mean 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.

8. 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 executing the process of the method according to any one of claims 1 to 7.

9. 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 7 is performed.

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