A control method for a combined air conditioning box

Abstract

The present invention provides a control method for a combined air-conditioning box, comprising the following steps: the initial operation state of the combined air-conditioning box is a normal state; the combined air-conditioning box turns on the fresh air fan and the fresh air valve to continuously or intermittently deliver fresh air to the air supply duct; the combined air-conditioning box operates in a cooling and dehumidifying condition or a cooling and humidifying condition. The environmental information of one or more of the indoor dry-bulb temperature, dew point temperature, wet-bulb temperature, moisture content, relative humidity, and enthalpy value is obtained through a sensor group, and the environmental information is fed back to the combined air-conditioning box, so that the combined air-conditioning box can accurately determine the indoor environmental conditions, and then adjust the air volume and the temperature and humidity of the air supply to keep the indoor temperature and humidity values ​​within the manually set range, so as to achieve the purpose of reducing energy consumption through precise adjustment.

Description

Technical Field

[0001] The invention relates to the field of air-conditioning equipment, and in particular to a control method for a combined air-conditioning box. Background Art

[0002] As we all know, there are a lot of tobacco in cigarette factories, especially in the workshops of making and storing tobacco, and their normal operation requires a stable temperature and humidity environment. The automatic control principle of the air conditioning system in cigarette factories is different from the comfort air conditioning used in civil buildings. The air conditioning control system needs to be specially designed according to the process requirements of the production workshop of cigarette factories for ambient temperature and humidity, especially to achieve high-precision control requirements for humidity, otherwise it will affect the quality of tobacco products.

[0003] In general, cigarette factories use combined air conditioners to control the temperature and humidity of tobacco making and storage workshops. The cooling section of the air conditioner is used to simultaneously meet the needs of cooling and dehumidification. This requires the same actuator to adjust two target values, resulting in unstable control and reheating, which causes a huge waste of energy. Therefore, under the premise of ensuring the production environment requirements of cigarette factories, optimizing the operation control mode of the air conditioning system is of great significance to the quality of tobacco production and energy saving and consumption reduction of factories.

[0004] Specifically, the indoor wet load varies greatly. The cooling load of tobacco production workshops such as tobacco making and storage in cigarette factories basically fluctuates with the external climate throughout the year. The cooling load caused by indoor heat generation is relatively small, and the temperature is more controllable; however, the indoor wet load fluctuates greatly during production. Tobacco will instantly absorb a large amount of water during production, especially in dry climate conditions. A large amount of humidification is required to meet the humidity requirements. Therefore, the large change in wet load poses a great challenge to the humidity control accuracy.

[0005] Indoor wet load and cold load do not match: When the air-conditioning box operates under cooling and dehumidification conditions, the air-conditioning box (without solid adsorption dehumidification, liquid absorption dehumidification, dry dehumidification, etc.) can only achieve the purpose of dehumidification by adjusting the surface cooling valve. When the indoor dehumidification capacity is large, the dehumidification of the surface cooling valve will cause the supply air temperature to be too cold and thus cause the indoor temperature to be too cold. At the same time, the fan can only maintain the same speed and cannot adjust the room temperature by adjusting the wind speed. The heating valve needs to be opened to heat the supply air to maintain the room temperature, resulting in energy waste.

[0006] The air conditioning box consumes a lot of energy in the whole year: In order to ensure that the temperature and humidity fluctuations in the production workshops such as silk making and storage in the cigarette factory are maintained within the set range, the air conditioning box is designed to have a large air supply volume. The surface cooling valve is directly adjusted to reduce the indoor relative humidity or the humidification valve is directly adjusted to increase the indoor relative humidity. The heating valve is used to correct and adjust the overcooled air supply temperature or indoor temperature. In order to ensure stable temperature and humidity control in all cases, the fan of the air conditioning box is generally set to operate at a power frequency of 45Hz or above under refrigeration conditions, and most of the time, the surface cooling valve / humidification valve and heating valve are opened at the same time, which is very energy-wasting. Summary of the invention

[0007] The purpose of the present invention is to provide a control method for a combined air-conditioning box, which aims to solve the problem that the existing control method of the combined air-conditioning box causes energy waste.

[0008] To achieve the purpose of the present invention, the technical solution adopted by the present invention is: a control method of a combined air conditioning box, comprising the following steps:

[0009] The initial operating state of the combined air conditioning box is normal;

[0010] The combined air conditioning box turns on the fresh air fan and the fresh air valve to continuously or intermittently deliver fresh air to the air supply duct;

[0011] The sensor group of the combined air conditioning box obtains one or more environmental information of indoor dry-bulb temperature, dew point temperature, wet-bulb temperature, moisture content, relative humidity, and enthalpy value, and feeds the environmental information back to the combined air conditioning box;

[0012] The combined air conditioning box operates in cooling and dehumidification mode or cooling and humidification mode, and adjusts the air supply volume and / or the temperature and humidity of the air supply of the air supply duct to keep the temperature and humidity delivered to the room by the air supply duct within a manually set range.

[0013] Preferably, the cooling and dehumidification operation mode is:

[0014] When the humidifying valve and the heating valve in the air supply duct are in a closed state, and the indoor dry-bulb temperature is higher than the manually set temperature range value, the combined air conditioning box switches to a normal state for operation;

[0015] When the fan in the air supply duct drops to the rated minimum speed and the indoor dry bulb temperature is lower than the manually set temperature range, the combined air conditioner switches to a low-load state;

[0016] When the surface cooling valve in the air supply duct is adjusted to a fully open state, and the indoor dew point temperature is higher than the manually set temperature range value, the combined air conditioning box switches to a high-load state for operation.

[0017] Preferably, when the combined air conditioning box is operating in a normal state, the combined air conditioning box adjusts the opening of the surface cooling valve and the speed of the fan to maintain the dry bulb temperature higher than the manually set temperature range value;

[0018] When the combined air conditioner is operated in a low-load state, the humidification valve of the air supply duct is closed, and the combined air conditioner adjusts the opening of the surface cooling valve and the opening of the heating valve to adjust the dry-bulb temperature to a value higher than the manually set temperature range;

[0019] The heating valve is closed, and the air conditioning box switches from low-load operation to normal operation during the combination;

[0020] When the combined air conditioner is operating in a high-load state, the combined air conditioner adjusts the opening of the surface cooling valve or the opening of the humidification valve, and the combined air conditioner reduces the speed of the fan;

[0021] When the speed of the fan drops to the rated minimum speed and the indoor dry-bulb temperature is lower than the manually set temperature range, the combined air-conditioning box switches from a high-load state to a low-load state.

[0022] Preferably, the cooling and humidification operation mode is:

[0023] The combined air conditioning box is operating in a normal state.

[0024] When the humidification load in the air supply duct is greater than the cooling load, the combined air conditioning box adjusts the surface cooling valve to be fully opened, and the dry bulb temperature is less than the manually set range value, the combined air conditioning box increases the opening of the humidification valve;

[0025] When the humidification load in the air supply duct is less than the cooling load, the combined air conditioning box adjusts the humidification valve to be fully opened, and the moisture content is less than the manually set range value, then the combined air conditioning box increases the opening of the surface cooling valve;

[0026] When the indoor dew point temperature and dry bulb temperature are maintained within the manually set range, and the speed of the fan is the rated minimum speed, the combined air conditioning box is operated in a low-load state;

[0027] When the indoor dew point temperature and dry bulb temperature are maintained within the manually set range, and the fan speed is at the rated maximum speed, the combined air conditioning box is operating in a high-load state.

[0028] Preferably, the calculation formula of the dry bulb temperature is:

[0029] T=f2(D,RH)=(B1÷(B2-LN(B3×(D÷1000×P÷1000÷(RH×(D÷1000+0.622))))))-B4

[0030] In the formula, B1=3991.11; B2=18.5916; B3=7.5; B4=233.84; T is dry bulb temperature; RH is relative humidity; D is moisture content; P is atmospheric pressure; LN is enthalpy value;

[0031] Preferably, the calculation formula of the moisture content is:

[0032] D=f1(T,RH)=622×EXP(A1÷(T+273.15)+A2+A3×(T+273.15)+A4×(T+273.15)^2+A5×(T+273.15)^3+A6×(T+273.15)^4+A7×LN((T+273.15)) ×RH÷(P-EXP(A1÷(T+273.15)+A2+A3×(T+273.15)+A4×(T+273.15)^2+A5×(T+273.15)^3+A6×(T+273.15)^4+A7×LN((T+273.15))×RH)

[0033] In the formula, T is the dry bulb temperature; RH is the relative humidity; D is the moisture content; P is the atmospheric pressure (1 standard atmospheric pressure = 101325 Pa); LN is the enthalpy value; A1=-5.8002206×10^3; A2=1.3914993; A3=-4.8640239×10^-2; A4=4.1764768×10^-5; A5=-1.4452093×10^-8; A6=0; A7=6.5459673.

[0034] Preferably, the combined air-conditioning box operates in an ambient temperature of 0-200°C.

[0035] Preferably, the sensor group includes a plurality of air parameter sensors and temperature and humidity sensors, and the plurality of air parameter sensors and temperature and humidity sensors are used to detect environmental information indoors, outdoors and in air supply ducts.

[0036] Preferably, the combined air-conditioning box is connected to an external terminal via wireless communication.

[0037] Preferably, the cooling and dehumidification operating condition operation and the cooling and humidification operating condition operation are controlled by analog signals.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. Obtain one or more of the indoor dry-bulb temperature, dew point temperature, wet-bulb temperature, moisture content, relative humidity, and enthalpy value through the sensor group, so that the combined air-conditioning box can accurately determine the indoor environmental conditions, and then adjust the air volume and the temperature and humidity of the air supply to keep the indoor temperature and humidity values ​​within the manually set range, thereby achieving the purpose of reducing energy consumption through precise adjustment.

[0040] 2. In order to improve the control accuracy of the combined air-conditioning box, analog signal control is used for the cooling and dehumidification operation and the cooling and humidification operation, and precise numerical values ​​are used for regulation. When the indoor environment changes due to the influence of the external environment, accurate and rapid regulation can be carried out, avoiding the problem of energy waste in the use of combined air-conditioning boxes.

[0041] 3. The control method of the combined air-conditioning box will be based on different indoor conditions, operating in cooling and dehumidification conditions or cooling and humidification conditions. Each operating condition is further subdivided into normal operation, low-load operation and high-load operation to cope with different indoor environments and carry out targeted regulation to reduce the energy consumption of regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a partial schematic diagram of the control method of the combined air-conditioning box described in the embodiment.

[0043] Reference numerals:

[0044] 10. Air supply duct;

[0045] 101. Surface cooling valve; 102. Heating valve; 103. Humidifying valve; 104. Air blower;

[0046] 105. Fresh air valve; 106. Return air valve;

[0047] 20. Temperature and humidity sensor. DETAILED DESCRIPTION

[0048] The present invention proposes a new solution. For a clearer representation, the present invention is described in detail below with reference to the accompanying drawings.

[0049] See also Figure 1The present embodiment provides a control method for a combined air-conditioning box, comprising the following steps: the initial operating state of the combined air-conditioning box is a normal state; the combined air-conditioning box turns on the fresh air fan and the fresh air valve 105 to continuously or intermittently deliver fresh air to the air supply duct 10; the sensor group of the combined air-conditioning box obtains one or more environmental information of the indoor dry-bulb temperature, dew point temperature, wet-bulb temperature, moisture content, relative humidity, and enthalpy value, and feeds back the environmental information to the combined air-conditioning box; the combined air-conditioning box operates in a cooling and dehumidification mode or a cooling and humidification mode, and adjusts the air supply volume and / or the temperature and humidity of the air supply duct 10 to keep the temperature and humidity delivered to the room by the air supply duct 10 within a manually set range.

[0050] In this embodiment, the sensor group can be used to obtain environmental information such as indoor dry-bulb temperature, dew point temperature, wet-bulb temperature, moisture content, relative humidity and enthalpy value, so that the combined air-conditioning box can accurately determine the indoor environmental conditions, and then adjust the air volume and the temperature and humidity of the supply air to keep the indoor temperature and humidity values ​​within the manually set range, thereby achieving the purpose of reducing energy consumption through precise adjustment.

[0051] This embodiment can be applied to the temperature and humidity regulation of tobacco or tobacco storage warehouses, and the storage warehouse is called indoor. Air parameter sensors are arranged indoors to obtain dry bulb temperature, dew point temperature, wet bulb temperature, moisture content, relative humidity, enthalpy value, etc., wherein the dry bulb temperature (English name: dry bulb temperature) is the value read from the dry bulb thermometer exposed to the air but not directly exposed to the sun. The dew point (or frost point) temperature (English name: dewtemperature) refers to the temperature when the air is cooled to saturation under the condition that the water vapor content and air pressure do not change. A control circuit board can be used in the combined air conditioner, and a serial interface is provided on the control circuit board, and the control circuit board also includes a CUP or a single-chip microcomputer for control, specifically: the CPU is Silicon Labs C8051F58, and its memory: 8KBytexdata ram, 256byte data ram 2016b and 1014 control board.

[0052] In this embodiment, when the combined air-conditioning box is operated in cooling and dehumidification conditions, it has normal operation, low-load operation and high-load operation. It will be regulated and operated according to changes in external environmental temperature and humidity to achieve the effect of efficient indoor control.

[0053] When the humidifying valve 103 and the heating valve 102 in the air supply duct 10 are in the closed state, and the indoor dry bulb temperature is higher than the manually set temperature range value, the combined air conditioner switches to normal operation. When the fan in the air supply duct 10 is reduced to the rated minimum speed, and the indoor dry bulb temperature is lower than the manually set temperature range value, the combined air conditioner switches to low load operation. When the surface cooling valve 101 in the air supply duct 10 is adjusted to a fully open state, and the indoor dew point temperature is higher than the manually set temperature range value, the combined air conditioner switches to high load operation.

[0054] Specifically, when the combined air-conditioning box is operating in a normal state, the humidifying valve 103 and the heating valve 102 are in a closed state, and the combined air-conditioning box adjusts the opening of the surface cooling valve 101 so that the return air dew point temperature in the return air duct is maintained within a manually set range, and the combined air-conditioning box adjusts the speed of the air supply fan 104 so that the indoor dry-bulb temperature is maintained within a manually set range, and normal control is performed to ensure the indoor temperature and humidity, and low energy consumption.

[0055] When the speed of the air supply fan 104 reaches the minimum speed and the indoor dry-bulb temperature is lower than the manually set range value, the combined air-conditioning box will switch the normal state operation to the low-load state operation.

[0056] When the operation state is low-load operation, the combined air conditioner box will control the speed of the air blower 104 to the minimum speed and close the humidification valve 103. The combined air conditioner box adjusts the opening of the cooling valve 101 to maintain the indoor dew point temperature within the manually set range. At the same time, the combined air conditioner box adjusts the opening of the heating valve 102 to maintain the indoor dry bulb temperature within the set range. When the heating valve 102 is closed and the indoor dry bulb temperature is higher than the set range, it switches to normal operation. It can cope with the impact of changes in ambient temperature and humidity, control with minimal energy consumption, maintain indoor temperature and humidity, and improve practicality.

[0057] When the combined air conditioner opens the surface cooling valve 101 to the maximum to adjust the indoor temperature, but the indoor dew point temperature is still higher than the manually set range value, the operation state of the combined air conditioner is switched to high load state.

[0058] When the operation state is high-load state, the combined air conditioner adjusts the opening of the cooling valve 101 to maintain the indoor dew point temperature at the set value; or, because the dehumidification is too dry, the humidification valve 103 is opened and the opening is adjusted, so that the humidity value in the room adjusted by the combined air conditioner increases in coordination; and the combined air conditioner adjusts the speed of the blower 104 to maintain the indoor dry bulb temperature within the range set by the human. By operating in a high-load state, the indoor temperature and humidity can be adjusted to the range set by the human in a short time.

[0059] Then, when the speed of the blower 104 is adjusted to the minimum speed and the indoor dry bulb temperature is lower than the manually set range value, the modular air conditioner adjusts the opening of the heating valve 102 to increase the indoor temperature. When the adjustment is continued so that the speed of the blower 104 is at the minimum value and the heating valve 102 is adjusted to be closed, the modular air conditioner will switch from high-load operation to low-load operation.

[0060] Through the setting of the above-mentioned operating status, under the cooling and dehumidification conditions, the combined air-conditioning box matches different cooling loads and wet loads according to the regulation of the external terminal, so that the combined air-conditioning box operates in different states to achieve the indoor temperature and humidity stability within the artificially set range value. The accuracy requirement range of the temperature and humidity can be: 26±2℃ temperature requirement and 55±5RH% humidity requirement.

[0061] In this embodiment, when the combined air-conditioning box is operated in a cooling and humidification mode, it also has normal operation, low-load operation and high-load operation. It will be regulated and operated according to changes in external environmental temperature and humidity to achieve efficient control of the indoor environment.

[0062] Specifically, when the combined air conditioner is operating in a normal state and the indoor humidification load is greater than the cooling load, the combined air conditioner reduces the opening of the humidification valve 103 until the dew point temperature in the air supply channel is maintained within the manually set range; the combined air conditioner increases the opening of the surface cooling valve 101 so that the indoor dry bulb temperature is maintained within the manually set range; and the combined air conditioner will coordinately adjust the speed of the fan to control the air supply volume so that the indoor dew point temperature is maintained within the manually set range. When the surface cooling valve 101 is opened to the maximum opening and still cannot meet the indoor temperature requirements, the combined air conditioner is switched to the following logic to operate:

[0063] At this time, if the indoor humidification load is lower than the cooling load, the combined air conditioner increases the opening of the humidification valve 103 to maintain the indoor dew point temperature within the manually set range; the combined air conditioner reduces the opening of the cooling valve 101 to maintain the air supply dew point temperature in the air supply duct 10 within the manually set range; and the combined air conditioner will coordinately adjust the speed of the air supply fan 104 to control the air supply volume so that the indoor dry bulb temperature is maintained within the manually set range. When the humidification valve 103 is opened to the maximum opening and still cannot meet the indoor humidity requirements, it switches to the above logic operation.

[0064] When the combined air-conditioning box is in low-load operation, the fan speed is at the minimum value, the combined air-conditioning box adjusts the humidification valve 103 to maintain the indoor dew point temperature within the manually set range, and the combined air-conditioning box adjusts the surface cooling valve 101 to maintain the indoor dry-bulb temperature within the manually set range.

[0065] When the combined air-conditioning box is in a high-load state, the fan speed is at the maximum value, the combined air-conditioning box adjusts the humidification valve 103 to maintain the indoor dew point temperature within the manually set range, and the combined air-conditioning box adjusts the surface cooling valve 101 to maintain the indoor dry-bulb temperature within the manually set range.

[0066] Through the setting of the above-mentioned operating status, under the cooling and humidification conditions, the combined air-conditioning box matches different cooling loads and wet loads according to the regulation of the external terminal, so that the combined air-conditioning box operates in different states, achieving the indoor temperature and humidity stability within the artificially set range value. The accuracy requirement range of the temperature and humidity can be: 26±2℃ temperature requirement, 55±5RH% humidity requirement.

[0067] In this embodiment, the calculation of the dry-bulb temperature is performed based on the moisture content and the relative humidity that can be handled by the cooling and dehumidification conditions, and then the corresponding air supply temperature can be set according to the dry-bulb temperature. The specific formula is as follows, and the detected value can be used for calculation.

[0068] T=f2(D,RH)=(B1÷(B2-LN(B3×(D÷1000×P÷1000÷(RH×(D÷1000+0.622))))))-B4

[0069] In the formula, B1=3991.11; B2=18.5916; B3=7.5; B4=233.84; T is dry bulb temperature; RH is relative humidity; D is moisture content; P is atmospheric pressure; LN is enthalpy.

[0070] The RH value of relative humidity is 85% if chilled water cooling is used, and 90% if direct expansion cooling is used.

[0071] In this embodiment, the moisture content is calculated by obtaining the dry-bulb temperature and relative humidity. The specific calculation formula is as follows, and the corresponding detection value can be substituted for calculation.

[0072] D=f1(T,RH)=622×EXP(A1÷(T+273.15)+A2+A3×(T+273.15)+A4×(T+273.15)^2+A5×(T+273.15)^3+A6×(T+273.15)^4+A7×LN((T+273.15)) ×RH÷(P-EXP(A1÷(T+273.15)+A2+A3×(T+273.15)+A4×(T+273.15)^2+A5×(T+273.15)^3+A6×(T+273.15)^4+A7×LN((T+273.15))×RH)

[0073] In the formula, T is the dry bulb temperature; RH is the relative humidity; D is the moisture content; P is the atmospheric pressure (1 standard atmospheric pressure = 101325 Pa); LN is the enthalpy value; A1=-5.8002206×10^3; A2=1.3914993; A3=-4.8640239×10^-2; A4=4.1764768×10^-5; A5=-1.4452093×10^-8; A6=0; A7=6.5459673.

[0074] The above formula can be used to accurately calculate the temperature value of the required air supply, and to correct the air supply temperature according to the feedback of the indoor wet load as the optimized air supply temperature, balancing the energy consumption of chilled water and the energy consumption of the fan to reduce the overall energy consumption.

[0075] In order to ensure that the combined air-conditioning box can operate normally in this embodiment, the operating environment temperature needs to be between 0-200°C to ensure the accuracy of its regulation.

[0076] In this embodiment, the sensor group includes a plurality of air parameter sensors and temperature and humidity sensors 20, which are used to detect the environmental information of indoor, outdoor and air supply duct 10. An air parameter sensor is installed indoors and outdoors respectively, so that the environmental information of indoor and outdoor can be clearly obtained; at the same time, a temperature and humidity sensor 20 is installed in different pipe sections of the air supply duct 10, for example: a temperature and humidity sensor 20 is installed in each of the pipe sections providing fresh air, return air, fresh air and return air mixing, and air supply pipe sections, so as to realize accurate understanding of the temperature and humidity values ​​of each pipe section, and then accurate adjustment and control can be performed to avoid energy waste during adjustment.

[0077] In order to better regulate the air volume of the air supply duct 10, a fresh air valve 105 is arranged on the fresh air duct, and a return air valve 106 is installed on the return air duct. The fresh air valve 105 and the return air valve 106 can be adjustable electric valves, thereby realizing stepless regulation during control, and at the same time, accurately controlling the air volume of the air supply duct 10 to ensure accurate regulation of indoor temperature and humidity values.

[0078] In this embodiment, the combined air conditioner is wirelessly connected to an external terminal. The external terminal may be a desktop computer, a laptop computer, or a mobile phone, etc., so that the combined air conditioner can be controlled through the external terminal to achieve the purpose of remotely controlling the combined air conditioner. At the same time, the combined air conditioner can also be monitored in real time to improve practicality.

[0079] In this embodiment, the cooling and dehumidification operation and the cooling and humidification operation are controlled by analog signals. The above-mentioned cooling valve 101, heating valve 102 and humidifying valve 103 can be adjustable electric valves, which are stepless adjustable valves. The air blower 104 is a rectangular multi-leaf air volume regulating valve to achieve stepless adjustment of the air blower 104. Combined with the combined air conditioner, the cooling valve 101, heating valve 102, humidifying valve 103 and air blower 104 are controlled by analog signals to adjust, thereby achieving the purpose of regulating with precise values, realizing accurate and rapid regulation of indoor temperature and humidity, and avoiding the problem of energy waste in the combined air conditioner.

[0080] The above embodiments are only used to explain the technical solutions of the present invention rather than to limit the same. Although the above embodiments specifically describe the present invention, relevant technical personnel should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications and equivalent replacements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A control method for a combined air conditioning box, characterized in that: The following steps are involved: The initial operating state of the combined air conditioning box is normal; The combined air conditioning box turns on the fresh air fan and the fresh air valve to continuously or intermittently deliver fresh air to the air supply duct; The sensor group of the combined air conditioning box obtains one or more environmental information of indoor dry-bulb temperature, dew point temperature, wet-bulb temperature, moisture content, relative humidity, and enthalpy value, and feeds the environmental information back to the combined air conditioning box; The combined air conditioner operates in cooling and dehumidification mode or cooling and humidification mode, and adjusts the air supply volume and / or the temperature and humidity of the air supply duct to keep the temperature and humidity of the air delivered to the room by the air supply duct within the manually set range; The cooling and humidification operation mode is as follows: The combined air conditioning box is operating in a normal state. When the humidification load in the air supply duct is greater than the cooling load, the combined air conditioning box adjusts the cooling valve to be fully opened, and the dry bulb temperature is less than the manually set range value, the combined air conditioning box increases the opening of the humidification valve; When the humidification load in the air supply duct is less than the cooling load, the combined air conditioning box adjusts the humidification valve to be fully opened, and the moisture content is less than the manually set range value, then the combined air conditioning box increases the opening of the surface cooling valve; When the indoor dew point temperature and dry bulb temperature are maintained within the manually set range, and the speed of the fan is the rated minimum speed, the combined air conditioning box is operated in a low-load state; When the indoor dew point temperature and dry bulb temperature are maintained within the manually set range, and the fan speed is at the rated maximum speed, the combined air conditioning box is operating in a high-load state.

2. The control method of the combined air conditioning box according to claim 1, characterized in that: The cooling and dehumidification operation mode is as follows: When the humidifying valve and the heating valve in the air supply duct are in a closed state, and the indoor dry-bulb temperature is higher than the manually set temperature range value, the combined air conditioning box switches to a normal state for operation; When the fan in the air supply duct drops to the rated minimum speed and the indoor dry bulb temperature is lower than the manually set temperature range, the combined air conditioner switches to a low-load state; When the surface cooling valve in the air supply duct is adjusted to a fully open state, and the indoor dew point temperature is higher than the manually set temperature range value, the combined air conditioning box switches to a high-load state for operation.

3. The control method of the combined air conditioning box according to claim 2, characterized in that: When the combined air conditioning box is operating in a normal state, the combined air conditioning box adjusts the opening of the surface cooling valve and the speed of the fan to maintain the dry bulb temperature higher than the manually set temperature range value; When the combined air conditioner is operated in a low-load state, the humidification valve of the air supply duct is closed, and the combined air conditioner adjusts the opening of the surface cooling valve and the opening of the heating valve to adjust the dry-bulb temperature to a value higher than the manually set temperature range; The heating valve is closed, and the combined air conditioning box switches from low-load operation to normal operation; When the combined air conditioner is operating in a high-load state, the combined air conditioner adjusts the opening of the surface cooling valve or the opening of the humidification valve, and the combined air conditioner reduces the speed of the fan; When the speed of the fan drops to the rated minimum speed and the indoor dry-bulb temperature is lower than the manually set temperature range, the combined air-conditioning box switches from high-load operation to low-load operation.

4. The control method of the combined air conditioning box according to claim 1, characterized in that: The combined air conditioning box operates in an ambient temperature of 0-200°C.

5. The control method of the combined air conditioning box according to claim 1, characterized in that: The sensor group includes a plurality of air parameter sensors and temperature and humidity sensors, and the plurality of air parameter sensors and temperature and humidity sensors are used to detect environmental information indoors, outdoors and in air supply ducts.

6. The control method of the combined air conditioning box according to claim 1, characterized in that: The combined air conditioning box is connected to an external terminal via wireless communication.

7. The control method of the combined air conditioning box according to claim 1, characterized in that: The cooling and dehumidification operating mode operation and the cooling and humidification operating mode operation are controlled by analog signals.

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