JP2000111124A - Air conditioning control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a hunting in dehumidification control and moistening control. SOLUTION: A dew point, when a relative humidity setting upper limit is RHU and a temperature setting low limit is TD, is taken as a dehumidification allowable indoor dew point DPU. When a relative humidity setting low limit is RHD and a temperature setting upper limit is TU, a dew point is taken as a moistening allowable indoor dew point setting value DPD. If an indoor dew point measurement value DPR becomes higher than DPU, dehumidification is performed, and if DPR becomes lower than DPD, moistening is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning control system for controlling humidity and temperature in a room to be air-conditioned.

[0002]

2. Description of the Related Art Conventionally, this type of air-conditioning control system has performed zero energy band control for controlling the humidity and temperature in a room to be air-conditioned to be within a predetermined allowable range. That is, the relative humidity setting lower limit value and the relative humidity setting upper limit value are determined, and while the room temperature is kept within the allowable temperature range between the temperature setting lower limit value and the temperature setting upper limit value, the measured indoor relative humidity value becomes the relative humidity setting upper limit value. If it exceeds, the relative humidity in the room to be air-conditioned is controlled to be within the allowable relative humidity range by humidifying when the measured value of the indoor relative humidity falls below the lower limit of the relative humidity setting. I have. FIG. 5 shows the operation of the zero energy band (dead zone) and the cooling coil valve / heating coil valve / humidifying valve.

[0003] With this zero energy band control, it is possible to save energy without excessively precisely controlling the environment in the room to be air-conditioned. That is, when the temperature and humidity are within the range of the zero energy band, a comfortable environment can be maintained without using wasteful energy. Heretofore, relative humidity is conventionally employed as an index for humidity control for the following reason. It is relative humidity that represents human discomfort. Static electricity occurs when the relative humidity is low, and the relative humidity is used as an index so that static electricity does not occur. The occurrence of mold is when the relative humidity is high, and the relative humidity is used as an index to prevent the occurrence of mold.

[0004]

However, in such conventional zero energy band control of temperature and humidity, since the relative humidity greatly fluctuates depending on the room temperature, the relative humidity changes with respect to the fluctuation of the room temperature within the allowable temperature range. In the vicinity of the set upper limit value or the relative humidity set lower limit value, deviation from the allowable relative humidity range frequently occurs, and there is a problem that dehumidification control and humidification control are hunted.

[0005] The present invention has been made to solve such problems, and an object of the present invention is to provide an air conditioning control system capable of preventing hunting of dehumidification control and humidification control.

[0006]

In order to achieve the above object, a first invention (an invention according to claim 1) is to dehumidify a dew point temperature when a relative humidity setting upper limit and a temperature setting lower limit are set. The room dew point temperature for permitting is set, the dew point temperature when the relative humidity is at the lower limit and the temperature setting upper limit is the room dew point temperature for humidification permission, and the measured indoor dew point temperature is the room dew point for dehumidification permission. Dehumidification is performed when the temperature exceeds the set value, while humidification is performed when the measured indoor dew point temperature falls below the humidification permission indoor dew point temperature set value. According to the present invention, when the measured indoor dew point temperature exceeds the dehumidification permission indoor dew point temperature set value, dehumidification is performed,
If the measured indoor dew point temperature falls below the humidification permission indoor dew point temperature set value, it is humidified, and the indoor dew point temperature has a dead zone between the dehumidification permission indoor dew point temperature set value and the humidification permission indoor dew point temperature set value. Is performed.

In a second invention (an invention according to claim 2), the dew point temperature when the relative humidity is set to the upper limit and the temperature is set to the lower limit is set as the dehumidification permission supply air dew point temperature set value. The dew point temperature at the temperature setting upper limit value is set as the humidification permission supply air dew point temperature set value, and when the measured supply air dew point temperature value exceeds the dehumidification permission air supply dew point temperature set value, dehumidification is performed. Humidification is performed when the measured value of the air dew point temperature falls below the set value of the supply air dew point for humidification permission. According to the present invention, when the measured value of the supply air dew point temperature exceeds the dehumidification permission supply air dew point temperature set value, the dehumidification is performed, and the measured supply air dew point temperature falls below the humidification permission air supply dew point temperature set value. In this case, humidification is performed, and zero energy band control of the supply air dew point temperature is performed in which the dead zone is between the dehumidification permission air supply dew point temperature set value and the humidification permission air supply dew point temperature set value.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 2 is a system configuration diagram showing an embodiment of the present invention. In the figure, 1 is an air conditioner,
2 is an air-conditioning control area (air-conditioning control target room) that receives supply of air supply from the air conditioner 1, 3 is a temperature sensor arranged in the air-conditioning control area 2, 4 is a humidity sensor arranged in the air-conditioning control area 2, 5 Is a dew point temperature sensor arranged in the air conditioning control area 2, 6 is an air supply temperature sensor arranged in an air supply passage 7 from the air conditioner 1 to the air conditioning control area 2, and 8 is an air conditioning controller.

The air conditioner 1 includes a cooling coil 1-1, a heating coil 1-2, a humidifier 1-3, and a fan 1-4. In the air conditioner 1, a cooling coil valve 9 is provided in a supply path of cold water to the cooling coil 1-1, a heating coil valve 10 is provided in a supply path of hot water to the heating coil 1-2, and a humidifier 1-3 is provided. The humidification valve 11 is provided in the water supply passage.

The air conditioning controller 8 includes a temperature sensor 3, a humidity sensor 4, a dew point temperature sensor 5, and an air supply temperature sensor 6.
, The valve opening of the cooling coil valve 9, the heating coil valve 10, and the humidifying valve 11 and the rotation amount of the fans 1-4 are controlled.

FIG. 3 shows a control operation specific to the present embodiment by the air conditioning controller 8. The air conditioning controller 8
The relative humidity setting upper limit value RHU (for example, 60% RH) and the relative humidity setting lower limit value RHD (for example, 40% RH) as the allowable relative humidity range in the air conditioning control area 2, and the allowable temperature range in the air conditioning control area 2 Temperature setting lower limit TD
(For example, 22 ° C.) and the temperature setting upper limit value TU (for example, 2
4 ° C.).

The air conditioning controller 8 sets the dew point temperature when the relative humidity setting upper limit value RHU and the temperature setting lower limit value TD to the dehumidification permitting room dew point temperature setting value DPU, and sets the relative humidity setting lower limit value RHD and the temperature setting upper limit value TU. Is set as the humidification permitting indoor dew point temperature set value DPD (step 301: refer to FIG. 1).

The air-conditioning controller 8 calculates an actual measured value of the room dew point temperature DPR detected by the dew point temperature sensor 5.
Is higher than the dehumidification permission indoor dew point temperature set value DPU (step 302).

If the measured indoor dew point temperature DPR exceeds the dehumidification permitting indoor dew point temperature set value DPU (in the case of the area A shown in FIG. 1), a dehumidifying humidity control calculation is performed (step 303). Dehumidification control is performed according to the calculation result (step 304). By this dehumidification control, the measured indoor dew point temperature DPR is changed to the dehumidification permitting indoor dew point temperature set value DP.
If it is not more than U, that is, if the humidity is satisfied, the temperature control is started (step 309). For example, when the current indoor environment is at the point PA in the area A, the air supply to the air conditioning control area 2 is cooled to the point P1 (DPU) in the air conditioner 1 and then heated to the point Q1 (TD).

When the measured indoor dew point temperature DPR does not exceed the dehumidification permitting indoor dew point temperature set value DPU, it is determined whether the measured indoor dew point temperature DPR is lower than the humidification permitting indoor dew point temperature set value DPD. Check (step 305).

If the measured indoor dew point temperature DPR is below the humidification permitting indoor dew point temperature set value DPD (in the region B shown in FIG. 1), a humidification humidity control calculation is performed (step 306). Humidification control is performed according to the calculation result (step 307). By this humidification control, the indoor dew point temperature actual measurement value DPR is changed to the humidification permission indoor dew point temperature set value DP.
If D or more, that is, if the humidity is satisfied, temperature control is started (step 309).

For example, when the current indoor environment is at the point PB1 in the area B, the air supply to the air conditioning control area 2 is humidified in the air conditioner 1 to the point Q2 (DPD). If the current indoor environment is at the point PB2 in the area B, the air supply to the air-conditioning control area 2 is switched to the point P2 (DPD).
After humidification, heat to point Q3 (TD). Also,
When the current indoor environment is at the PB3 point in the area B, the air supply to the air conditioning control area 2 is humidified to the P3 point (DPD), and then cooled to the Q4 point (TU).

At step 305, when the measured indoor dew point temperature DPR is not lower than the set value of the humidification permitting indoor dew point temperature DPD, that is, the measured indoor dew point temperature DPR
Is between the dehumidification permission indoor dew point temperature set value DPU and the humidification permission indoor dew point temperature set value DPD,
The humidity control is not performed between the PU and the DPD as a dead zone (zero energy band) of the indoor dew point temperature (step 30).
8) Perform only temperature control. For example, when the current indoor environment is at the PC point in the area C shown in FIG. 1, the air supply to the air conditioning control area 2 is heated to the point Q5 (TD).
The current indoor environment is the PD in the area D shown in FIG.
If so, the air supply to the air conditioning control area 2 is cooled to the point Q6 (TU).

The measured indoor dew point temperature DPR is between the dehumidification permission indoor dew point temperature set value DPU and the humidification permission indoor dew point temperature set value DPD, and the measured indoor temperature TR from the temperature sensor 3 is lower than the temperature setting lower limit. Value TD and temperature setting upper limit T
U (when in the region X shown in FIG. 1), a space between the DPU and the DPD is set as a dead zone (zero energy band) of the room dew point temperature, and a space between the TD and the TU is set as the room temperature. A dead zone (zero energy band) is set, and neither humidity control nor temperature control is performed.

With such zero energy band control of the indoor dew point temperature and the indoor temperature, the humidity and temperature of the air-conditioning control area 2 are kept within the allowable range X, and a comfortable environment without using wasteful energy. Can be kept.
Here, since the determination of the dehumidification control is performed based on the dehumidification permission indoor dew point temperature set value DPU, and the determination of the humidification control is performed based on the humidification permission indoor dew point temperature set value DPD, the indoor temperature fluctuates within the allowable temperature range. Even though dehumidification control and humidification control are not performed,
Hunting of dehumidification control and humidification control is prevented.

Since the water content has a high diffusivity and a quick response, control with less delay can be performed by using the dew point temperature having a quick response as an index rather than the relative humidity (the temperature is not determined). In a constant temperature / humidity room such as a clean room, the sensible heat ratio (SHF) is almost equal to 1, and the indoor humidity is controlled by the supply air humidity of the air conditioner. Using the dew point temperature as an index for the zero energy band of the humidity control does not cause a shift due to the difference in the index, and the convenience of the person who manages it is improved.

In the above-described embodiment, the dew point temperature sensor 5 is arranged in the air conditioning control area 2 to measure the indoor dew point temperature in the air conditioning control area 2. However, as shown in FIG. A dew point temperature sensor 5 may be arranged in the air supply passage 7 to the area 2 to actually measure the air supply dew point temperature to the air conditioning control area 2.

In this case, the dew point temperature when the relative humidity setting upper limit value RHU and the temperature setting lower limit value TD are set to the dehumidifying permission supply air dew point temperature setting value DPU, and the relative humidity setting lower limit value R
The dew point temperature at the time of HD and the temperature setting upper limit value TU is set to the humidification permission supply air dew point temperature set value DPD, and the measured supply air dew point temperature DPR is set to the dehumidification permission supply air dew point temperature set value D.
Dehumidification is performed when the temperature exceeds PU, while humidification is performed when the measured value of the supply air dew point temperature DPR falls below the humidification permission supply air dew point temperature set value DPD.

In the method using the supply air dew point temperature, compared with the method using the indoor dew point temperature, the measured value can be obtained quickly, so that the control delay can be suppressed.

[0025]

As apparent from the above description, according to the present invention, in the first invention, when the measured indoor dew point temperature exceeds the dehumidification permitting indoor dew point temperature set value, the dehumidification is performed, and the indoor dew point is reduced. If the measured temperature falls below the humidification permission indoor dew point temperature set value, it is humidified, and the indoor dew point temperature is zero, which is a dead zone between the dehumidification permission indoor dew point temperature set value and the humidification permission indoor dew point temperature set value. Energy band control is performed, and in the second invention, when the measured value of the supply air dew point temperature exceeds the set value of the dehumidification permission supply air dew point, dehumidification is performed, and the measured value of the supply air dew point temperature changes to the humidification permission air supply dew point. When the temperature falls below the set temperature, the humidifier is humidified, and zero energy band control of the supply air dew point temperature is performed with the dead zone between the dehumidification permission air supply dew point temperature set value and the humidification permission air supply dew point temperature set value. , Indoor temperature within the allowable temperature range There not performed dehumidification control and humidification control be varied, it is possible to prevent hunting of the dehumidification control and humidification control.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining humidity control and temperature control in the system shown in FIG. 2;

FIG. 2 is a system configuration diagram showing an embodiment of the present invention.

FIG. 3 is a flowchart showing a specific control operation in this system.

FIG. 4 is a diagram illustrating an example of an arrangement of a dew point temperature sensor in an air supply passage.

FIG. 5 is a diagram showing the operation of a conventional zero energy band (dead zone) and the operation of a cooling coil valve / heating coil valve / humidifying valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 1-1 ... Cooling coil, 1-2 ... Heating coil, 1-3 ... Humidifier, 1-4 ... Fan, 2 ... Air-conditioning control area (room for air-conditioning control), 3 ... Temperature sensor, 4 ... humidity sensor, 5 ... dew point temperature sensor, 5 ... supply air temperature sensor, 7
... air supply passage, 8 ... air conditioning controller, 9 ... cooling coil valve, 10 ... heating coil valve, 11 ... humidification valve.

Claims (2)

[Claims] 1. A method for controlling a relative humidity in an air-conditioning control target room within an allowable relative humidity range between a relative humidity setting lower limit value and a relative humidity setting upper limit value, and setting the temperature in the air-conditioning control target room to a temperature setting lower limit value. In an air conditioning control system that controls the temperature within an allowable temperature range between the temperature setting upper limit and the relative humidity setting upper limit and the temperature setting lower limit, a dew point temperature is a dehumidification permitting indoor dew point temperature setting value,
When the dew point temperature when the relative humidity setting lower limit value and the temperature setting upper limit value are the humidification permission indoor dew point temperature set value, and the measured indoor dew point temperature exceeds the dehumidification permission indoor dew point temperature set value, An air-conditioning control system comprising: humidity control means for humidifying when the measured indoor dew point temperature falls below the humidification permitting indoor dew point temperature set value while dehumidifying. 2. The relative humidity in the room to be air-conditioned is controlled within an allowable relative humidity range between a relative humidity setting lower limit value and a relative humidity setting upper limit value, and the temperature in the air-conditioning control target room is set to a temperature setting lower limit value. And an air conditioning control system that controls the temperature within an allowable temperature range between the temperature setting upper limit value and the dew point temperature when the relative humidity setting upper limit value and the temperature setting lower limit value are the dehumidification permission supply air dew point temperature setting value. ,
The dew point temperature when the relative humidity setting lower limit value and the temperature setting upper limit value are the humidification permitting supply air dew point temperature set value, and the measured supply air dew point temperature is the dehumidification permission supply air dew point temperature set value. An air-conditioning control system comprising: humidity control means for dehumidifying when the temperature exceeds the temperature, and humidifying when the measured value of the air supply dew point temperature falls below the humidification permission air supply dew point temperature set value.