All-weather adaptive energy-saving control method and air conditioning box

Abstract

The present application is suitable for air conditioner control technical field, provide a kind of all-weather adaptive energy-saving control method and air conditioner box.The present application is calculated primary coil temperature Tc1 and primary return air ratio α;If Tc1>Tcw+3.5, then calculate Ψ (0) and Ψ (1) ;If Ψ (0) and Ψ (1) are different signs, corresponding adjustment is carried out;If Ψ (0) and Ψ (1) are same sign, and simultaneously less than 0, corresponding adjustment is carried out;If Tc1≤Tcw+3.5, corresponding adjustment is carried out;Recalculate primary coil temperature Tc1 and primary return air ratio α.Can calculate the most energy-saving secondary return air ratio in real time, and can calculate the clean room system cold / wet load, to obtain the actual air supply state point, make the traditional secondary return air conditioner box more intelligent, can adjust secondary return air ratio according to indoor cold, wet load and outdoor climate condition, make air conditioner box in best energy-saving state.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning control technology, and particularly relates to an all-weather adaptive energy-saving control method and an air conditioning unit. Background Technology

[0002] In pharmaceutical cleanrooms, the majority of operating costs for modular air conditioning units are comprised of cooling and heating energy consumption. Reducing cooling and heating energy consumption during air handling, while meeting the indoor temperature and humidity requirements for pharmaceutical production, can significantly lower operating costs.

[0003] The traditional single-pass air handling process is as follows: In summer and transitional seasons, fresh and return air are first mixed, cooled to the dew point temperature in the surface cooling section, and then heated to the supply air temperature in the heating section before being delivered to the cleanroom.

[0004] In a single-pass air conditioning unit, the remaining cooling capacity, besides the effective cooling capacity, is offset by the heat consumed during reheating, resulting in energy waste.

[0005] A secondary return air system achieves energy savings by mixing indoor return air twice, replacing the reheating process while maintaining indoor temperature and humidity control. However, traditional secondary return air systems, despite designing return air volumes for both return air sections, often fail to achieve satisfactory control in practical applications due to reasons including:

[0006] (1) Uncertainty of the air supply state point: The air supply state point is given by humans and may not be the actual reasonable air supply state point. For example, a large temperature difference between day and night or a large humidity source in the clean room will cause the air supply state point to move, which will cause the secondary return air ratio calculation value to change. Moreover, the electric regulating valve or manual valve that is often arranged in the AHU return air duct cannot realize the function of adjusting the secondary return air ratio in real time.

[0007] (2) The post-treatment temperature of the primary cooling coil is difficult to calculate: the state point of the primary mixed air after being treated by the cooling coil needs to be found by relying on the enthalpy-humidity diagram and drawing auxiliary lines. There is no mathematical model. For the complex selection process of AHU and the variable environment, the method of drawing auxiliary lines by enthalpy-humidity diagram is not convenient for real-time calculation and cannot be adjusted in real time in the automatic control system. Summary of the Invention

[0008] The purpose of this invention is to provide an all-weather adaptive energy-saving control method and air conditioning unit, which aims to solve the technical problems existing in the prior art mentioned in the background art.

[0009] The embodiments of the present invention are implemented as follows:

[0010] An all-weather adaptive energy-saving control method, the method specifically includes the following steps:

[0011] Receive the input initialization data and collect sensor monitoring data, calculate the primary coil outlet air temperature Tc1 and the primary return air ratio α, and compare the primary coil outlet air temperature Tc1 with the primary coil water supply temperature Tcw.

[0012] If Tc1>Tcw+3.5, then calculate Ψ(0) and Ψ(1), and determine whether Ψ(0) and Ψ(1) have opposite signs;

[0013] If Ψ(0) and Ψ(1) have opposite signs, the opening of the primary return air variable air volume valve is adjusted according to the primary return air ratio α, and the opening of the energy valve is adjusted according to the primary coil outlet air temperature Tc1.

[0014] If Ψ(0) and Ψ(1) have the same sign and are both less than 0, then the opening of the primary return air variable air volume valve is adjusted so that the primary return air ratio α=0, and the corresponding primary coil outlet air temperature Tc1 is calculated, and the opening of the energy valve is adjusted accordingly.

[0015] If Tc1≤Tcw+3.5, then set the primary coil outlet air temperature to Tcw+3.5, calculate the α* required for dehumidification, adjust the opening of the primary return air variable air volume valve, and adjust the opening of the energy valve so that the primary coil outlet air temperature reaches Tcw+3.5.

[0016] The primary return air and secondary return air are mixed, and the temperature is adjusted to the supply air state point using the reheat coil. The actual indoor cooling load and actual humidity load are calculated, the latest supply air state point is calculated, and the primary coil outlet air temperature Tc1 and the primary return air ratio α are recalculated.

[0017] As a further limitation of the technical solution of this embodiment of the invention, the calculation formulas for the primary coil outlet air temperature Tc1 and the primary return air ratio α are as follows:

[0018] ;

[0019] ;

[0020] ;

[0021] in, This is a function of the moisture content corresponding to the primary coil outlet air temperature; This is a function of the total humidity of the mixed air after passing through one cooling coil. This refers to the total mass flow of the mixed air; The moisture content of the secondary mixed air; For fresh air ratio; The moisture content of the return air; Let be a rational function of the primary return air ratio, and be the moisture content of the primary mixed air after passing through the primary cooling coil when the air is cleaned and dehumidified. This is the specific enthalpy function corresponding to the primary coil outlet air temperature; This is the total energy function of the mixed air after passing through one cooling coil; Specific enthalpy of secondary mixed air; The specific enthalpy of the return air; Let be a rational function of the primary return air ratio, and be the specific enthalpy of the primary mixed air after passing through a primary cooling coil, after removing all energy. To solve the iterative calculation formula for the primary return air ratio α, from The function is used to find That is, the primary coil outlet air temperature is When the moisture has been completely removed, then... Substitution Function, verification Is it equal to Iterative calculations are performed until a unique value for the return air ratio α is obtained, such that... This means achieving a state where both moisture and energy are completely removed.

[0022] As a further limitation of the technical solution of this embodiment of the invention, the calculation formulas for Ψ(0) and Ψ(1) are as follows:

[0023] ;

[0024] in, The difference between the enthalpy of the secondary air mixing and the enthalpy of the set air supply state point, assuming that the air is completely dry.

[0025] As a further limitation of the technical solution of this embodiment of the invention, in the calculation of Ψ(0) and Ψ(1), and the determination of whether Ψ(0) and Ψ(1) have opposite signs: [the following is a partial translation of the original text, which is not possible without further context.] Primary coil outlet air temperature ,get Find out Primary coil outlet air temperature ,get If Ψ(0) and Ψ(1) have opposite signs, then there exists a point where the air conditioning unit can completely eliminate reheat, i.e., the optimal energy-saving point; if and If all values ​​are less than 0, then reheating is unavoidable.

[0026] As a further limitation of the technical solution of this invention embodiment, the step of adjusting the opening of the primary return air variable air volume valve according to the primary return air ratio α, and adjusting the opening of the energy valve according to the primary coil outlet air temperature Tc1, specifically includes the following steps:

[0027] The air conditioning unit is determined to be in the optimal energy-saving mode, at which point it can both remove moisture and completely eliminate reheat.

[0028] The opening of the primary return air variable air volume valve is adjusted according to the primary return air ratio α.

[0029] The opening of the energy valve is adjusted according to the primary coil outlet air temperature Tc1.

[0030] As a further limitation of the technical solution of this embodiment of the invention, the adjustment of the opening of the primary return air variable air volume valve to make the primary return air ratio α=0, and the calculation of the corresponding primary coil outlet air temperature Tc1, specifically includes the following steps:

[0031] The air conditioning unit was determined to require reheating.

[0032] The opening of the primary return air variable air volume valve is adjusted so that the primary return air ratio α=0;

[0033] Calculate the primary coil outlet air temperature Tc1 when the primary return air ratio α=0;

[0034] The opening of the energy valve is adjusted accordingly based on the primary coil outlet air temperature Tc1 when the primary return air ratio α=0.

[0035] As a further limitation of the technical solution of this invention embodiment, the steps of setting the primary coil outlet air temperature to Tcw+3.5, calculating the required α* for dehumidification, adjusting the opening of the primary return air variable air volume valve, and adjusting the opening of the energy valve to make the primary coil outlet air temperature reach Tcw+3.5 specifically include the following steps:

[0036] It was determined that the single-stage cooling coil was insufficient to process the air to Tc1 at this point;

[0037] Set the primary coil outlet air temperature to Tcw+3.5;

[0038] Calculate the α* required to completely remove moisture;

[0039] Adjust the opening of the primary return air variable air volume valve to adjust the primary return air ratio to α*;

[0040] Adjust the opening of the energy valve so that the primary coil outlet air temperature reaches Tcw+3.5.

[0041] As a further limitation of the technical solution of this embodiment of the invention, the mixing of primary return air and secondary return air, adjusting the temperature to the supply air state point using a reheat coil, calculating the actual indoor cooling load and actual humidity load, calculating the latest supply air state point, and recalculating the primary coil outlet air temperature Tc1 and the primary return air ratio α specifically includes the following steps:

[0042] The primary return air treated by the first cold coil is mixed with the secondary return air, and the temperature is adjusted to the supply air state point by the reheat coil.

[0043] Based on the sensor monitoring data, calculate the actual indoor cooling load and actual humidity load;

[0044] Calculate the latest air supply status point based on the actual indoor cooling load and the actual humidity load;

[0045] Based on the latest air supply status point, recalculate the coil outlet air temperature Tc1 and the primary return air ratio α.

[0046] An all-weather adaptive energy-saving air conditioning unit is provided, wherein the all-weather adaptive energy-saving air conditioning unit stores a computer program, and when the computer program is executed by a processor, the processor performs the steps of the all-weather adaptive energy-saving control method described above.

[0047] Compared with the prior art, the beneficial effects of the present invention are:

[0048] (1) By equipping the traditional secondary return air air conditioning unit with corresponding sensors and actuators and combining scientific and reasonable algorithms, the present invention makes the traditional secondary return air air conditioning unit more intelligent and can intelligently adjust the secondary return air ratio according to the indoor cooling and humidity load and outdoor climate conditions, so that the air conditioning unit is in the best energy-saving state.

[0049] (2) The present invention realizes mathematical modeling of enthalpy-humidity diagram, accurately calculates the best energy-saving point through digital means, and can be adjusted in real time, which greatly enhances the immediacy. It can calculate the most energy-efficient secondary return air ratio in real time, and can calculate the cold / humidity load of the clean room system, thereby obtaining the actual air supply state point. Attached Figure Description

[0050] Figure 1 A system diagram of a conventional single-pass return air handling system provided in an embodiment of the present invention is shown;

[0051] Figure 2 A flowchart of the all-weather adaptive energy-saving control method provided in an embodiment of the present invention is shown;

[0052] Figure 3 A system diagram of the all-weather adaptive energy-saving air conditioning unit provided in an embodiment of the present invention is shown. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0054] It is understandable that, such as Figure 1The diagram illustrates a conventional single-pass return air handling system according to an embodiment of the present invention. The conventional single-pass return air handling process involves: in summer and transitional seasons, fresh and return air are first mixed, then cooled to the dew point temperature in a surface cooling section for cooling and dehumidification, and then heated to the supply air temperature in a heating section before being delivered to the cleanroom. In this single-pass return air handling unit, the remaining cooling capacity, besides the effective cooling capacity, is offset by the heat consumed during the reheating process, resulting in energy waste. The secondary return air system achieves energy saving by mixing indoor return air twice, replacing the reheating process under the premise of controlling indoor temperature and humidity. However, the traditional secondary return air system designs return air volume for both return air sections, but the control effect is often poor in actual application. The reasons include: (1) Uncertainty of the supply air state point: The supply air state point is given by humans and is not necessarily the actual reasonable supply air state point. For example, a large temperature difference between day and night or a large humidity source in the clean room will cause the supply air state point to move, which will cause the calculated value of the secondary return air ratio to change. Moreover, the electric regulating valve or manual valve arranged in the return air duct of the AHU cannot realize the function of adjusting the secondary return air ratio in real time; (2) Difficulty in calculating the post-treatment temperature of the primary cold coil: The search for the state point of the primary mixed air after treatment by the cold coil needs to rely on the enthalpy-humidity diagram and draw auxiliary lines. There is no mathematical model. For the complex selection process of AHU and the variable environment, the method of drawing auxiliary lines by enthalpy-humidity diagram is not convenient for real-time calculation and cannot be adjusted in real time in the automatic control system.

[0055] To address the aforementioned issues, this invention discloses an all-weather adaptive energy-saving control method and air conditioning unit. This method receives initialization data and collects sensor monitoring data, calculates the primary coil outlet air temperature Tc1 and the primary return air ratio α, and compares the primary coil outlet air temperature Tc1 with the primary coil water supply temperature Tcw. If Tc1 > Tcw + 3.5, then Ψ(0) and Ψ(1) are calculated, and it is determined whether Ψ(0) and Ψ(1) have opposite signs. If Ψ(0) and Ψ(1) have opposite signs, the opening of the primary return air variable air volume valve is adjusted according to the primary return air ratio α, and the opening of the energy valve is adjusted according to the primary coil outlet air temperature Tc1. If Ψ(0) and Ψ(1) have the same sign, and are in the same position... If the value is less than 0, adjust the opening of the primary return air variable air volume valve to make the primary return air ratio α=0, calculate the corresponding primary coil outlet air temperature Tc1, and adjust the energy valve opening. If Tc1≤Tcw+3.5, set the primary coil outlet air temperature to Tcw+3.5, calculate the required α* for dehumidification, adjust the opening of the primary return air variable air volume valve, and adjust the energy valve opening to make the primary coil outlet air temperature reach Tcw+3.5. The primary and secondary return air are mixed, and the temperature is adjusted to the supply air state point using the reheat coil. The actual indoor cooling load and actual humidity load are calculated, the latest supply air state point is calculated, and the primary coil outlet air temperature Tc1 and primary return air ratio α are recalculated. It can calculate the most energy-efficient secondary return air ratio in real time and can also calculate the cooling / humidity load of the cleanroom system, thereby obtaining the actual air supply state point. This makes the traditional secondary return air conditioning unit more intelligent, and can intelligently adjust the secondary return air ratio according to the indoor cooling and humidity load and outdoor climate conditions, so that the air conditioning unit is in the best energy-saving state.

[0056] Specifically, Figure 2 A flowchart of the all-weather adaptive energy-saving control method provided in an embodiment of the present invention is shown.

[0057] In a preferred embodiment of the present invention, an all-weather adaptive energy-saving control method specifically includes the following steps:

[0058] Step 1: Receive the input initialization data and collect sensor monitoring data. Calculate the primary coil outlet air temperature Tc1 and the primary return air ratio α, and compare the primary coil outlet air temperature Tc1 with the primary coil water supply temperature Tcw.

[0059] In this embodiment of the invention, initialization data is received, and sensor monitoring data is collected. Substituting the initialization data, the primary coil outlet air temperature Tc1 and the primary return air ratio α, after removing heat and humidity, are iteratively calculated. The primary coil outlet air temperature Tc1 is then compared with the primary coil water supply temperature Tcw. Specifically, the calculation formulas for the primary coil outlet air temperature Tc1 and the primary return air ratio α are as follows:

[0060] ;

[0061] ;

[0062] ;

[0063] in, This is a function of the moisture content corresponding to the primary coil outlet air temperature; This is a function of the total humidity of the mixed air after passing through one cooling coil. This refers to the total mass flow of the mixed air; The moisture content of the secondary mixed air; For fresh air ratio; The moisture content of the return air; Let be a rational function of the primary return air ratio, and be the moisture content of the primary mixed air after passing through the primary cooling coil when the air is cleaned and dehumidified. This is the specific enthalpy function corresponding to the primary coil outlet air temperature; This is the total energy function of the mixed air after passing through one cooling coil; Specific enthalpy of secondary mixed air; The specific enthalpy of the return air; Let be a rational function of the primary return air ratio, and be the specific enthalpy of the primary mixed air after passing through a primary cooling coil, after removing all energy. To solve the iterative calculation formula for the primary return air ratio α, from The function is used to find That is, the primary coil outlet air temperature is When the moisture has been completely removed, then... Substitution Function, verification Is it equal to Iterative calculations are performed until a unique value for the return air ratio α is obtained, such that... This means achieving a state where both moisture and energy are completely removed.

[0064] Understandably, the initialization data includes atmospheric pressure B, fresh air ratio F, total supply air volume Vs, indoor humidity load w, supply air set temperature Tss, return air set temperature Th, return air set relative humidity RHh, and default values. Among these, the default values ​​include: supply air set temperature = return air set temperature minus 4℃, and indoor humidity load 0.3g / kg dry air. The sensor monitoring data includes: fresh air temperature To, fresh air relative humidity RHo, supply air temperature Ts, supply air relative humidity RHs, return air temperature Tr, return air relative humidity RHr, primary cooling coil water supply temperature Tcw, total return air volume Vr measured by the return air main variable air volume valve, and primary return air volume Vr1 measured by the primary return air duct variable air volume valve.

[0065] Step 2: If Tc1>Tcw+3.5, calculate Ψ(0) and Ψ(1) and determine whether Ψ(0) and Ψ(1) have opposite signs.

[0066] In this embodiment of the invention, the values ​​of the primary coil outlet air temperature Tc1 and the primary coil water supply temperature Tcw are compared. If Tc1 > Tcw + 3.5, it is determined that the primary cooling coil can process the air to Tc1. This is then calculated... Primary coil outlet air temperature ,get Find out Primary coil outlet air temperature ,get If Ψ(0) and Ψ(1) have opposite signs, then there exists a point where the air conditioning unit can completely eliminate reheat, i.e., the optimal energy-saving point; if and If both are less than 0, then reheating is inevitable. Specifically, the formulas for calculating Ψ(0) and Ψ(1) are as follows:

[0067] ;

[0068] in, The difference between the enthalpy of the secondary air mixing and the enthalpy of the set air supply state point, assuming that the air is completely dry.

[0069] Understandable This is a user-defined function, representing the difference between the enthalpy of the secondary air mixing after cleaning and humidification, and the enthalpy of the set air supply state point. for At that time, the difference between the enthalpy after secondary air mixing and the enthalpy at the set air supply state point; for At that time, the difference between the enthalpy after secondary air mixing and the enthalpy at the set air supply state point.

[0070] Step 3: If Ψ(0) and Ψ(1) have opposite signs, adjust the opening of the primary return air variable air volume valve according to the primary return air ratio α, and adjust the opening of the energy valve according to the primary coil outlet air temperature Tc1.

[0071] In this embodiment of the invention, when Ψ(0) and Ψ(1) have opposite signs, it is determined that the air conditioning unit is in the best energy-saving mode. At this time, it can remove moisture and completely eliminate reheat. The opening of the primary return air variable air volume valve is adjusted according to the primary return air ratio α, and the opening of the energy valve is adjusted according to the primary coil outlet air temperature Tc1.

[0072] Step 4: If Ψ(0) and Ψ(1) have the same sign and are both less than 0, adjust the opening of the primary return air variable air volume valve so that the primary return air ratio α=0, calculate the corresponding primary coil outlet air temperature Tc1, and adjust the opening of the energy valve.

[0073] In this embodiment of the invention, when Ψ(0) and Ψ(1) have the same sign and are both less than 0, it is determined that the air conditioning unit must be reheated. The opening of the primary return air variable air volume valve is adjusted so that the primary return air ratio α=0. The primary coil outlet air temperature Tc1 when the primary return air ratio α=0 is calculated. Then, the opening of the energy valve is adjusted accordingly according to the primary coil outlet air temperature Tc1 when the primary return air ratio α=0.

[0074] Step 5: If Tc1≤Tcw+3.5, then set the primary coil outlet air temperature to Tcw+3.5, calculate the α* required for dehumidification, adjust the opening of the primary return air variable air volume valve, and adjust the opening of the energy valve so that the primary coil outlet air temperature reaches Tcw+3.5.

[0075] In this embodiment of the invention, when Tc1≤Tcw+3.5, it is determined that the primary cooling coil is insufficient to process the air to Tc1. By setting the primary coil outlet air temperature to Tcw+3.5, calculating the required α* for dehumidification, and then adjusting the opening of the primary return air variable air volume valve to adjust the primary return air ratio to α*, and adjusting the opening of the energy valve to make the primary coil outlet air temperature reach Tcw+3.5.

[0076] Step 6: Mix the primary and secondary return air, adjust the temperature to the supply air state point using the reheat coil, calculate the actual indoor cooling load and actual humidity load, calculate the latest supply air state point, and recalculate the primary coil outlet air temperature Tc1 and the primary return air ratio α.

[0077] In this embodiment of the invention, when the primary return air and secondary return air treated by the primary cooling coil are mixed, and Ψ(0) and Ψ(1) have the same sign or Tc1≤Tcw+3.5, the temperature is adjusted to the air supply state point using the reheat coil. Based on the sensor monitoring data, the actual indoor cooling load and actual humidity load are calculated. Then, based on the actual indoor cooling load and actual humidity load, the latest air supply state point is calculated. After that, based on the latest air supply state point, the primary coil outlet air temperature Tc1 and the primary return air ratio α are recalculated, and the cycle of step one is entered.

[0078] Furthermore, such as Figure 3 A system diagram of an all-weather adaptive energy-saving air conditioning unit provided in an embodiment of the present invention is shown. In another embodiment, an all-weather adaptive energy-saving air conditioning unit is proposed, wherein a computer program is stored on the all-weather adaptive energy-saving air conditioning unit, and when the computer program is executed by a processor, the processor performs the following steps:

[0079] Step 1: Receive the input initialization data and collect sensor monitoring data, calculate the primary coil outlet air temperature Tc1 and the primary return air ratio α, and compare the primary coil outlet air temperature Tc1 with the primary coil water supply temperature Tcw.

[0080] Step 2: If Tc1>Tcw+3.5, calculate Ψ(0) and Ψ(1), and determine whether Ψ(0) and Ψ(1) have opposite signs;

[0081] Step 3: If Ψ(0) and Ψ(1) have opposite signs, adjust the opening of the primary return air variable air volume valve according to the primary return air ratio α, and adjust the opening of the energy valve according to the primary coil outlet air temperature Tc1.

[0082] Step 4: If Ψ(0) and Ψ(1) have the same sign and are both less than 0, adjust the opening of the primary return air variable air volume valve so that the primary return air ratio α=0, and calculate the corresponding primary coil outlet air temperature Tc1, and adjust the opening of the energy valve.

[0083] Step 5: If Tc1≤Tcw+3.5, then set the primary coil outlet air temperature to Tcw+3.5, calculate the α* required for dehumidification, adjust the opening of the primary return air variable air volume valve, and adjust the opening of the energy valve so that the primary coil outlet air temperature reaches Tcw+3.5.

[0084] Step 6: Mix the primary and secondary return air, adjust the temperature to the supply air state point using the reheat coil, calculate the actual indoor cooling load and actual humidity load, calculate the latest supply air state point, and recalculate the primary coil outlet air temperature Tc1 and the primary return air ratio α.

[0085] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for all-weather adaptive energy-saving control, characterized in that, The method specifically includes the following steps: Receive the input initialization data and collect sensor monitoring data, calculate the primary coil outlet air temperature Tc1 and the primary return air ratio α, and compare the primary coil outlet air temperature Tc1 with the primary coil water supply temperature Tcw. If Tc1>Tcw+3.5, then calculate Ψ(0) and Ψ(1), and determine whether Ψ(0) and Ψ(1) have opposite signs; If Ψ(0) and Ψ(1) have opposite signs, the opening of the primary return air variable air volume valve is adjusted according to the primary return air ratio α, and the opening of the energy valve is adjusted according to the primary coil outlet air temperature Tc1. If Ψ(0) and Ψ(1) have the same sign and are both less than 0, then the opening of the primary return air variable air volume valve is adjusted so that the primary return air ratio α=0, and the corresponding primary coil outlet air temperature Tc1 is calculated, and the opening of the energy valve is adjusted accordingly. If Tc1≤Tcw+3.5, then set the primary coil outlet air temperature to Tcw+3.5, calculate the α* required for dehumidification, adjust the opening of the primary return air variable air volume valve, and adjust the opening of the energy valve so that the primary coil outlet air temperature reaches Tcw+3.5, where α* is the primary return air ratio required for dehumidification when the primary coil outlet air temperature is Tcw+3.5; The primary return air and secondary return air are mixed. The temperature is adjusted to the supply air state point using the reheat coil. The actual indoor cooling load and actual humidity load are calculated. The latest supply air state point is calculated. The primary coil outlet air temperature Tc1 and the primary return air ratio α are recalculated. The formulas for calculating the primary coil outlet air temperature Tc1 and the primary return air ratio α are as follows: ； ； ； in, This is a function of the moisture content corresponding to the primary coil outlet air temperature; This is a function of the total humidity of the mixed air after passing through one cooling coil. This refers to the total mass flow of the mixed air; The moisture content of the secondary mixed air; For fresh air ratio; The moisture content of the return air; Let be a rational function of the primary return air ratio, and be the moisture content of the primary mixed air after passing through the primary cooling coil when the air is cleaned and dehumidified. This is the specific enthalpy function corresponding to the primary coil outlet air temperature; This is the total energy function of the mixed air after passing through one cooling coil; Specific enthalpy of secondary mixed air; The specific enthalpy of the return air; Let be a rational function of the primary return air ratio, and be the specific enthalpy of the primary mixed air after passing through a primary cooling coil, after removing all energy. To solve the iterative calculation formula for the primary return air ratio α, from The function is used to find That is, the primary coil outlet air temperature is When the moisture has been completely removed, then... Substitution Function, verification Is it equal to Iterative calculations are performed until a unique value for the return air ratio α is obtained, such that... This means achieving a state where both moisture and energy are completely removed; The formulas for calculating Ψ(0) and Ψ(1) are as follows: ； in, The difference between the enthalpy of the secondary air mixing and the enthalpy of the set air supply state point, assuming that the air is completely dehumidified; In the calculation of Ψ(0) and Ψ(1), and in determining whether Ψ(0) and Ψ(1) have opposite signs: [the following is a partial translation of the original text, which is not possible without further context.] Primary coil outlet air temperature ,get Find out Primary coil outlet air temperature ,get If Ψ(0) and Ψ(1) have opposite signs, then there exists a point where the air conditioning unit can completely eliminate reheat, i.e., the optimal energy-saving point; if and If all values ​​are less than 0, then reheating is unavoidable.

2. The all-weather adaptive energy-saving control method according to claim 1, characterized in that, The adjustment of the opening of the primary return air variable air volume valve according to the primary return air ratio α, and the adjustment of the energy valve opening according to the primary coil outlet air temperature Tc1, specifically includes the following steps: The air conditioning unit is determined to be in the optimal energy-saving mode, at which point it can both remove moisture and completely eliminate reheat. The opening of the primary return air variable air volume valve is adjusted according to the primary return air ratio α. The opening of the energy valve is adjusted according to the primary coil outlet air temperature Tc1.

3. The all-weather adaptive energy-saving control method according to claim 1, characterized in that, The adjustment of the opening of the primary return air variable air volume valve to make the primary return air ratio α=0, and the calculation of the corresponding primary coil outlet air temperature Tc1, specifically includes the following steps: The air conditioning unit was determined to require reheating. The opening of the primary return air variable air volume valve is adjusted so that the primary return air ratio α=0; Calculate the primary coil outlet air temperature Tc1 when the primary return air ratio α=0; The opening of the energy valve is adjusted accordingly based on the primary coil outlet air temperature Tc1 when the primary return air ratio α=0.

4. The all-weather adaptive energy-saving control method according to claim 1, characterized in that, The steps to set the primary coil outlet air temperature to Tcw+3.5, calculate the required α* for dehumidification, adjust the opening of the primary return air variable air volume valve, and adjust the opening of the energy valve to achieve the primary coil outlet air temperature of Tcw+3.5 include the following: It was determined that the single-stage cooling coil was insufficient to process the air to Tc1 at this point; Set the primary coil outlet air temperature to Tcw+3.5; Calculate the α* required to completely remove moisture; Adjust the opening of the primary return air variable air volume valve to adjust the primary return air ratio to α*; Adjust the opening of the energy valve so that the primary coil outlet air temperature reaches Tcw+3.

5.

5. The all-weather adaptive energy-saving control method according to claim 1, characterized in that, The mixing of primary and secondary return air, the temperature adjustment to the supply air state point using the reheat coil, the calculation of the actual indoor cooling load and actual humidity load, the calculation of the latest supply air state point, and the recalculation of the primary coil outlet air temperature Tc1 and the primary return air ratio α specifically include the following steps: The primary return air treated by the first cold coil is mixed with the secondary return air, and the temperature is adjusted to the supply air state point by the reheat coil. Based on the sensor monitoring data, calculate the actual indoor cooling load and actual humidity load; Calculate the latest air supply status point based on the actual indoor cooling load and the actual humidity load; Based on the latest air supply status point, recalculate the coil outlet air temperature Tc1 and the primary return air ratio α.

6. An all-weather adaptive energy-saving air conditioning unit, characterized in that, The all-weather adaptive energy-saving air conditioning unit stores a computer program, which, when executed by a processor, causes the processor to perform the steps of the all-weather adaptive energy-saving control method according to any one of claims 1 to 5.

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