An adaptive temperature and humidity control system and method for factory buildings

Abstract

This invention belongs to the technical field of factory air conditioning systems, specifically relating to an adaptive temperature and humidity control system and method for factories. In this system, a first humidity detection device and a first temperature detection device are connected to the supply air duct; a second temperature detection device is installed on the return air duct; and a second humidity detection device is installed at the rear end of the pre-cooling coil. The first humidity detection device, the second humidity detection device, the first temperature detection device, and the second temperature detection device are respectively connected to the input terminal of the temperature and humidity control system. The pre-cooling water valve, the surface cooling water valve, the hot water heating valve, and the steam humidification valve are respectively connected to the output terminal of the temperature and humidity control system. This invention employs a cascaded dual-PID temperature + cascaded dual-PID humidity parallel control method to achieve temperature and humidity environmental control in cleanrooms. The control accuracy is high, and the stability is good, thus enabling the system to operate more energy-efficiently and effectively, showing great application prospects.

Description

Technical Field

[0001] This invention belongs to the technical field of factory air conditioning systems, specifically relating to an adaptive temperature and humidity control system and method for factories. Background Technology

[0002] In some factories with high environmental requirements (such as filling rooms, incubators, and drying rooms in clean pharmaceutical plants), one of the most important environmental conditions is temperature and humidity. Temperature and humidity provide strict protection for the production process, ensuring compliance with international and domestic regulations and mandatory standards. Clean pharmaceutical plants typically use the following cooling and heating equipment: chillers (ice machines), hot water boilers, air conditioning systems (MAU, AHU, PAU, RCU), and other equipment.

[0003] These devices are selected and combined according to different usage scenarios and requirements to achieve the temperature and humidity environment required by the process. Among them, the air conditioning system is the most critical, and its control effect directly affects the temperature and humidity environment of the workshop. The air conditioning system needs to achieve automated control, and adjust the opening and closing of water valves, air valves, and fan start and stop frequencies based on the temperature, humidity, pressure, or air volume in the room or on the pipeline, so as to realize the transfer and regulation of cold and heat sources.

[0004] Adaptive control requires automatic control based on environment and requirements. Without direct human intervention, it utilizes external equipment or devices to automatically operate a machine, equipment, or production process according to a predetermined pattern, controlling a specific working state or parameter. Automatic control, in contrast to manual control, refers to the automatic operation of a controlled object or process according to a preset logic or algorithm (PID) without human intervention. Adaptive control systems have many classifications and applications, covering almost all industries. For cleanroom pharmaceutical plants, the primary purpose is to achieve unified management, rational scheduling, and energy conservation for equipment distributed throughout cooling (heating) facilities. It features automation, safety, and intelligence, enabling adaptive temperature and humidity control within the plant.

[0005] The purpose of existing factory temperature and humidity control systems is to automatically acquire the status of the cold and heat source transmission equipment in the air conditioning system, automatically collect on-site temperature and humidity data, and automatically control the cold and heat source transmission equipment through comparison and calculation of temperature and humidity parameters by the control system. Simultaneously, the software records data, graphically displays the process flow and location relationships of the cold and heat source equipment, and provides historical records and trends for traceability.

[0006] However, precise temperature and humidity control is difficult due to seasonal changes, environmental variations, interference from indoor equipment's heat and cold sources, and human factors. While air conditioning systems have automatic temperature and humidity control strategies, they are often based on single PID control, and the selection of temperature and humidity detection points is difficult to adapt to different types of air conditioners, making it challenging to achieve high-precision and high-response temperature and humidity control. For pharmaceutical companies requiring high-precision and high-stability temperature and humidity control, this often necessitates frequent manual intervention, easily leading to quality deviations.

[0007] Therefore, there is an urgent need in this field to improve the setting method and PID control method of air conditioning systems in order to further improve the accuracy and stability of temperature and humidity control, and to further achieve the goal of more energy saving and efficient system operation. Summary of the Invention

[0008] To address the problems of existing technologies, this invention provides an adaptive temperature and humidity control system and method for factory buildings, aiming to improve the accuracy and stability of temperature and humidity control through system improvements.

[0009] An adaptive temperature and humidity control system for a factory includes an air conditioning system, which is connected to the factory through supply air ducts and return air ducts. The air conditioning system includes a pre-cooling coil, a surface cooling coil, a heating coil, and a steam humidification device.

[0010] The supply air duct is connected to a first humidity detection device and a first temperature detection device, the return air duct is equipped with a second temperature detection device, and the rear end of the pre-cooling coil is equipped with a second humidity detection device.

[0011] It also includes a temperature and humidity control system, wherein the first humidity detection device and the second humidity detection device are respectively connected to the input terminal of the temperature and humidity control system, and the first temperature detection device and the second temperature detection device are respectively connected to the input terminal of the temperature and humidity control system.

[0012] The pre-cooling coil includes a pre-cooling water valve, the surface cooling coil includes a surface cooling water valve, the heating coil includes a hot water heating valve, and the steam humidification device includes a steam humidification valve. The pre-cooling water valve, surface cooling water valve, hot water heating valve, and steam humidification valve are respectively connected to the output terminal of the temperature and humidity control system.

[0013] Preferably, the temperature and humidity control system includes a humidity control PID, which includes a supply air humidity content PID and a pre-cooling coil humidity content PID. The humidity control PID is configured as follows:

[0014] The measured value of supply air humidity obtained by the first humidity detection device is taken as PV, and the set value of supply air humidity is taken as SP, so the MV of supply air humidity PID is obtained.

[0015] The MV of the moisture content PID of the supply air is taken as SP, and the moisture content measured after the pre-cooling coil is obtained by the second humidity detection device as PV, so as to obtain the MV of the moisture content PID after the pre-cooling coil.

[0016] The opening degree of the pre-cooled water valve and / or steam humidification valve is continuously adjusted using the MV of the PID of the moisture content after the pre-cooled coil.

[0017] Preferably, when the pre-cooled water valve is fully open and the moisture content still does not meet the requirements, the opening of the pre-cooled water valve is continuously adjusted using the MV of the moisture content PID after the pre-cooled coil until the moisture content meets the requirements.

[0018] Preferably, the temperature and humidity control system includes a temperature control PID, which includes a return air temperature PID and a supply air temperature PID, and the temperature control PID is configured as follows:

[0019] The return air temperature measured by the second temperature detection device is used as PV, and the return air temperature setpoint is used as SP to obtain the MV of the return air temperature PID.

[0020] The return air temperature PID MV is used as SP, and the supply air temperature measured by the first temperature detection device is used as PV to obtain the supply air temperature PID MV.

[0021] The opening degree of the cooling water valve and / or hot water heating valve is continuously adjusted using the MV of the air supply temperature PID.

[0022] Preferably, when the humidity control PID adjusts the surface cooling water valve, the temperature control PID stops adjusting the surface cooling water valve.

[0023] This invention also provides a method for temperature and humidity control using the above-mentioned adaptive temperature and humidity control system for factory buildings, including:

[0024] The temperature and humidity control system uses the detection results of the first humidity detection device and the second humidity detection device to adjust at least one of the pre-cooled water valve, the surface cooling water valve and the steam humidification valve;

[0025] The temperature and humidity control system uses the detection results of the first temperature detection device and the second temperature detection device to adjust at least one of the surface cooling water valve and the hot water heating valve.

[0026] The present invention also provides an adaptive humidity control system for a factory, including an air conditioning system. The air conditioning system is connected to the factory through supply air ducts and return air ducts. The air conditioning system includes a pre-cooling coil, a surface cooling coil, a heating coil, and a steam humidification device.

[0027] A first humidity detection device is connected to the air supply duct, and a second humidity detection device is installed at the rear end of the pre-cooling coil.

[0028] It also includes a humidity control system, wherein the first humidity detection device and the second humidity detection device are respectively connected to the input terminal of the temperature and humidity control system.

[0029] The pre-cooling coil includes a pre-cooling water valve, the surface cooling coil includes a surface cooling water valve, the steam humidification device includes a steam humidification valve, and the pre-cooling water valve, surface cooling water valve and steam humidification valve are respectively connected to the output terminal of the temperature and humidity control system.

[0030] Preferably, the humidity control system includes a humidity control PID, which includes a supply air humidity content PID and a pre-cooling coil humidity content PID. The humidity control PID is configured as follows:

[0031] The measured value of supply air humidity obtained by the first humidity detection device is taken as PV, and the set value of supply air humidity is taken as SP, so the MV of supply air humidity PID is obtained.

[0032] The MV of the moisture content PID of the supply air is taken as SP, and the moisture content measured after the pre-cooling coil is obtained by the second humidity detection device as PV, so as to obtain the MV of the moisture content PID after the pre-cooling coil.

[0033] The opening degree of at least one of the pre-cooled water valve, the main cooling water valve, and the steam humidification valve is continuously adjusted using the MV of the PID of the moisture content after the pre-cooled coil.

[0034] This invention also provides a method for humidity control using the above-mentioned adaptive humidity control system for factory buildings, including:

[0035] The humidity control system uses the detection results of the first humidity detection device and the second humidity detection device to adjust at least one of the pre-cooled water valve, the surface cooling water valve and the steam humidification valve.

[0036] The present invention also provides a computer-readable storage medium having stored thereon a computer program for implementing the above-mentioned adaptive temperature and humidity control system for a factory, or the above-mentioned temperature and humidity control method, or the above-mentioned adaptive humidity control system for a factory, or the above-mentioned humidity control method.

[0037] In this invention, "PID" refers to a control system that controls the error generated by comparing the real-time data of the controlled object with the given value using the proportion, integral, and derivative. It is abbreviated as PID (Proportional Integral Derivative) control system. "PV" refers to Process value (the current process measurement value), "SP" refers to set point (the setpoint for PID control), and "MV" refers to Manipulated Variable (usually the output value of the PID).

[0038] This invention improves the air conditioning system in factories requiring precise temperature and humidity control (such as clean pharmaceutical plants). It integrates heating and cooling equipment, including pre-cooling coils, surface cooling coils, hot water coils, and steam humidification coils, into a unified temperature and humidity control strategy. A cascaded dual-PID temperature + cascaded dual-PID humidity parallel control method is employed to achieve precise temperature and humidity control in the cleanroom. The control system and method of this invention offer high precision and stability, enabling the system to operate more energy-efficiently and effectively, thus demonstrating promising application prospects.

[0039] Obviously, based on the above description of the present invention, and according to common technical knowledge and conventional methods in the field, various other modifications, substitutions or alterations can be made without departing from the basic technical concept of the present invention.

[0040] The following detailed embodiments further illustrate the above-described content of the present invention. However, this should not be construed as limiting the scope of the present invention to the following examples. All technologies implemented based on the above-described content of the present invention fall within the scope of the present invention. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the humidity control PID of the present invention;

[0042] Figure 2 This is a schematic diagram of the temperature control PID of the present invention;

[0043] Figure 3 The room temperature trend under the first conventional control strategy in Experiment Example 1 of this invention;

[0044] Figure 4 The room humidity trend under the first conventional control strategy in Experiment Example 1 of this invention;

[0045] Figure 5 This illustrates the room temperature trend under the second conventional control strategy in Experiment Example 1 of this invention.

[0046] Figure 6This is the room humidity trend under the second conventional control strategy in Experiment Example 1 of the present invention;

[0047] Figure 7 The room temperature trend under the control strategy of Example 2 in Experiment 1 of this invention;

[0048] Figure 8 The room humidity trend under the control strategy of Example 2 in Experiment 1 of this invention. Detailed Implementation

[0049] It should be noted that the algorithms for data acquisition, transmission, storage and processing steps not specifically described in the embodiments, as well as the hardware structures and circuit connections not specifically described, can all be implemented using content already disclosed in the prior art.

[0050] Example 1: Humidity Control System and Control Method

[0051] The adaptive humidity control system for the factory building in this embodiment includes an air conditioning system, which is connected to the factory building through supply air ducts and return air ducts.

[0052] The air conditioning system includes a pre-cooling coil, a surface cooling coil, a heating coil, and a steam humidification device. In this embodiment, the pre-cooling coil, surface cooling coil, heating coil, and steam humidification device are all existing heating, cooling, dehumidifying, or humidifying devices.

[0053] The air conditioning system is divided into the following sections from the air inlet side to the air outlet side: fresh air section, pre-cooled coil section, fresh and return air mixing section, pre-cooled coil section, heating coil section, air supply fan section, and steam humidification device section.

[0054] The temperature and humidity control system includes a temperature control PID and a humidity control PID. The humidity control PID includes a supply air moisture content PID and a pre-cooling coil moisture content PID. The humidity control PID is configured as follows:

[0055] The measured value of supply air humidity obtained by the first humidity detection device is taken as PV, and the set value of supply air humidity is taken as SP, so the MV of supply air humidity PID is obtained.

[0056] The MV of the moisture content PID of the supply air is taken as SP, and the moisture content measured after the pre-cooling coil is obtained by the second humidity detection device as PV, so as to obtain the MV of the moisture content PID after the pre-cooling coil.

[0057] The opening degree of the pre-cooled water valve and / or steam humidification valve is continuously adjusted using the MV of the PID of the moisture content after the pre-cooled coil.

[0058] A first humidity detection device is connected to the air supply duct, and a second humidity detection device is installed at the rear end of the pre-cooling coil.

[0059] It also includes a humidity control system, wherein the first humidity detection device and the second humidity detection device are respectively connected to the input terminal of the temperature and humidity control system.

[0060] The pre-cooling coil includes a pre-cooling water valve, the surface cooling coil includes a surface cooling water valve, the steam humidification device includes a steam humidification valve, and the pre-cooling water valve, surface cooling water valve and steam humidification valve are respectively connected to the output terminal of the temperature and humidity control system.

[0061] The humidity control system includes a humidity control PID, which includes a supply air moisture content PID and a pre-cooling coil moisture content PID. The humidity control PID is as follows: Figure 1 As shown, it is configured as follows:

[0062] The measured value of supply air humidity obtained by the first humidity detection device is taken as PV, and the set value of supply air humidity is taken as SP, so the MV of supply air humidity PID is obtained.

[0063] The MV of the moisture content PID of the supply air is taken as SP, and the moisture content measured after the pre-cooling coil is obtained by the second humidity detection device as PV, so as to obtain the MV of the moisture content PID after the pre-cooling coil.

[0064] The opening degrees of the pre-cooled water valve and the steam humidification valve are continuously adjusted using the MV of the PID of the moisture content after the pre-cooled coil. When the pre-cooled water valve is fully open and the moisture content still does not meet the requirements, the opening degree of the pre-cooled water valve is continuously adjusted using the MV of the PID of the moisture content after the pre-cooled coil until the moisture content meets the requirements.

[0065] The method for humidity regulation using the above system is as follows:

[0066] The humidity control system uses the detection results of the first humidity detection device and the second humidity detection device to adjust at least one of the pre-cooled water valve, the surface cooling water valve and the steam humidification valve.

[0067] Example 2: Temperature and Humidity Control System and Control Method

[0068] The adaptive temperature and humidity control system for the factory building in this embodiment includes an air conditioning system, which is connected to the factory building through supply air ducts and return air ducts.

[0069] The air conditioning system includes a pre-cooling coil, a surface cooling coil, a heating coil, and a steam humidification device. In this embodiment, the pre-cooling coil, surface cooling coil, heating coil, and steam humidification device are all existing heating, cooling, dehumidifying, or humidifying devices.

[0070] The air conditioning system is divided into the following sections from the air inlet side to the air outlet side: fresh air section, pre-cooled coil section, fresh and return air mixing section, pre-cooled coil section, heating coil section, air supply fan section, and steam humidification device section.

[0071] The supply air duct is connected to a first humidity detection device and a first temperature detection device, the return air duct is equipped with a second temperature detection device, and the rear end of the pre-cooling coil is equipped with a second humidity detection device.

[0072] It also includes a temperature and humidity control system, wherein the first humidity detection device and the second humidity detection device are respectively connected to the input terminal of the temperature and humidity control system, and the first temperature detection device and the second temperature detection device are respectively connected to the input terminal of the temperature and humidity control system; the pre-cooling coil includes a pre-cooling water valve, the surface cooling coil includes a surface cooling water valve, the heating coil includes a hot water heating valve, the steam humidification device includes a steam humidification valve, and the pre-cooling water valve, the surface cooling water valve, the hot water heating valve and the steam humidification valve are respectively connected to the output terminal of the temperature and humidity control system.

[0073] The temperature and humidity control system includes a humidity control PID and a temperature control PID.

[0074] The humidity control PID is as follows Figure 1 As shown, this includes a PID for supply air humidity and a PID for humidity control after the pre-cooling coil. The humidity control PID is configured as follows:

[0075] The measured value of supply air humidity obtained by the first humidity detection device is taken as PV, and the set value of supply air humidity is taken as SP, so the MV of supply air humidity PID is obtained.

[0076] The MV of the moisture content PID of the supply air is taken as SP, and the moisture content measured after the pre-cooling coil is obtained by the second humidity detection device as PV, so as to obtain the MV of the moisture content PID after the pre-cooling coil.

[0077] The opening degree of the pre-cooled water valve and the steam humidification valve is continuously adjusted using the MV of the PID of the moisture content after the pre-cooled coil.

[0078] When the pre-cooled water valve is fully open and the moisture content still does not meet the requirements, the opening of the pre-cooled water valve is continuously adjusted using the MV of the moisture content PID after the pre-cooled coil until the moisture content meets the requirements.

[0079] The temperature control PID is as follows: Figure 2 As shown, this includes a return air temperature PID and a supply air temperature PID, wherein the temperature control PID is configured as follows:

[0080] The return air temperature measured by the second temperature detection device is used as PV, and the return air temperature setpoint is used as SP to obtain the MV of the return air temperature PID.

[0081] The return air temperature PID MV is used as SP, and the supply air temperature measured by the first temperature detection device is used as PV to obtain the supply air temperature PID MV.

[0082] The opening degree of the cooling water valve and / or hot water heating valve is continuously adjusted using the MV of the supply air temperature PID. When the humidity control PID adjusts the cooling water valve, the temperature control PID stops adjusting the cooling water valve.

[0083] The method for temperature and humidity regulation using the above system is as follows:

[0084] The temperature and humidity control system uses the detection results of the first humidity detection device and the second humidity detection device to adjust at least one of the pre-cooled water valve, the surface cooling water valve and the steam humidification valve;

[0085] The temperature and humidity control system uses the detection results of the first temperature detection device and the second temperature detection device to adjust at least one of the surface cooling water valve and the hot water heating valve.

[0086] The technical solution of the present invention will be further illustrated by the following experiments.

[0087] Experiment Example 1: Comparison of the effects of different temperature and humidity control methods

[0088] I. Experimental Methods

[0089] As we all know, temperature and humidity control is of paramount importance for every factory's air conditioning system, so each company has a wide variety of control strategies and different selection points for temperature and humidity.

[0090] To verify the superiority of this invention in terms of control accuracy, stability, and practicality, this experimental example selects two conventional temperature and humidity control strategies in the industry and conducts a comparative experiment with Example 2 of this invention.

[0091] The first conventional control strategy: Return air temperature and return air humidity are selected as the detection points for temperature PID and humidity PID respectively, and single PID control is performed. Other undescribed hardware settings of the air conditioning system are the same as in Example 2.

[0092] The second conventional control strategy is to select the supply air temperature and humidity and return air temperature and humidity as the detection points for temperature PID and humidity PID, respectively, and perform cascade PID control.

[0093] The following table compares the three control methods:

[0094]

[0095] This experiment tested the temperature and humidity control effect of the final production area by installing temperature and humidity sensors in rooms controlled by three different air conditioning systems. After a month of continuous operation and observation, temperature and humidity trend graphs were obtained in the factory under the three control strategies.

[0096] II. Experimental Results

[0097] The result of the first control strategy is as follows: Figure 3 , 4 As shown, because only the return air temperature and humidity are available, there is a significant lag, resulting in large fluctuations in both temperature and humidity control. In particular, when large changes in outdoor weather cause fluctuations in the outdoor fresh air temperature and humidity, an over-limit alarm occurs, making it impossible to meet the requirements of adaptive temperature and humidity control.

[0098] The result of the second control strategy is as follows: Figure 5 , 6 As shown, the addition of cascaded PID control, through the incorporation of supply air temperature and humidity parameters, effectively reduces the lag caused by a single PID controller. However, fluctuations still exist. Although the first type of uncontrollable temperature and humidity issue is not present, the accuracy and stability still cannot fully meet the high requirements of cleanrooms.

[0099] The results of the control strategy in Embodiment 2 of the present invention are as follows: Figure 7 , 8 As shown, it is clearly superior to the first and second methods. It not only meets the basic requirements of controllable temperature and humidity without exceeding limits and triggering alarms, but also exhibits very small fluctuations and avoids back-and-forth oscillations. Furthermore, it adaptively adjusts according to changes in outdoor temperature and humidity, meeting the high precision and high stability requirements of cleanrooms. In addition, while the temperature control strategy of Embodiment 2 is similar to the second control strategy, the temperature control precision and stability of Embodiment 2 are significantly better than the second control strategy. This indicates that the combination of the temperature and humidity control methods of this invention, with their high precision and high stability in humidity control, also contributes to the improvement of temperature control precision and stability.

[0100] As can be seen from the above embodiments and experimental examples, the invention improves the air conditioning system in the factory. By adjusting the temperature and humidity detection position and improving the cascade dual PID control method, it achieves high-precision and high-stability control of temperature and humidity, thereby enabling the system to operate more energy-efficiently and efficiently, and has good application prospects.

Claims

1. A factory building adaptive temperature and humidity control system, comprising an air conditioning system, wherein the air conditioning system is connected to the factory building via supply air ducts and return air ducts, characterized in that: The air conditioning system includes a pre-cooling coil, a surface cooling coil, a heating coil, and a steam humidification device; The supply air duct is connected to a first humidity detection device and a first temperature detection device, the return air duct is equipped with a second temperature detection device, and the rear end of the pre-cooling coil is equipped with a second humidity detection device. It also includes a temperature and humidity control system, wherein the first humidity detection device and the second humidity detection device are respectively connected to the input terminal of the temperature and humidity control system, and the first temperature detection device and the second temperature detection device are respectively connected to the input terminal of the temperature and humidity control system. The pre-cooling coil includes a pre-cooling water valve, the surface cooling coil includes a surface cooling water valve, the heating coil includes a hot water heating valve, and the steam humidification device includes a steam humidification valve. The pre-cooling water valve, surface cooling water valve, hot water heating valve, and steam humidification valve are respectively connected to the output terminal of the temperature and humidity control system. The temperature and humidity control system includes a humidity control PID, which includes a supply air humidity content PID and a pre-cooling coil humidity content PID. The humidity control PID is configured as follows: The measured value of supply air humidity obtained by the first humidity detection device is taken as PV, and the set value of supply air humidity is taken as SP, so the MV of supply air humidity PID is obtained. The MV of the moisture content PID of the supply air is taken as SP, and the moisture content measured after the pre-cooling coil is obtained by the second humidity detection device as PV, so as to obtain the MV of the moisture content PID after the pre-cooling coil. The opening degree of the pre-cooled water valve and / or steam humidification valve is continuously adjusted using the MV of the PID of the moisture content after the pre-cooled coil. The temperature and humidity control system includes a temperature control PID, which includes a return air temperature PID and a supply air temperature PID. The temperature control PID is configured as follows: The return air temperature measured by the second temperature detection device is used as PV, and the return air temperature setpoint is used as SP to obtain the MV of the return air temperature PID. The return air temperature PID MV is used as SP, and the supply air temperature measured by the first temperature detection device is used as PV to obtain the supply air temperature PID MV. The opening degree of the cooling water valve and / or hot water heating valve is continuously adjusted using the MV of the air supply temperature PID.

2. The adaptive temperature and humidity control system for factory buildings according to claim 1, characterized in that: When the pre-cooled water valve is fully open and the moisture content still does not meet the requirements, the opening of the pre-cooled water valve is continuously adjusted using the MV of the moisture content PID after the pre-cooled coil until the moisture content meets the requirements.

3. The adaptive temperature and humidity control system for factory buildings according to claim 1, characterized in that: When the humidity control PID adjusts the surface cooling water valve, the temperature control PID stops adjusting the surface cooling water valve.

4. A method for temperature and humidity control using the adaptive temperature and humidity control system for factory buildings according to any one of claims 1-3, characterized in that, include: The temperature and humidity control system uses the detection results of the first humidity detection device and the second humidity detection device to adjust at least one of the pre-cooled water valve, the surface cooling water valve and the steam humidification valve; The temperature and humidity control system uses the detection results of the first temperature detection device and the second temperature detection device to adjust at least one of the surface cooling water valve and the hot water heating valve.

5. A computer-readable storage medium, characterized in that, It stores a computer program for implementing the factory adaptive temperature and humidity control system as described in any one of claims 1-3, or for implementing the temperature and humidity control method as described in claim 4.

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