JPH0938546A - Method and apparatus for controlling air conditioning of coating booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excess energy from being consumed by a method wherein the present open air condition is measured and a region where the measured present open air condition exists is selected among a plurality of regions of air condition and instruments constituting an air-conditioner are operated in accordance with an air conditioning mode corresponding to the selected region. SOLUTION: An air-conditioner 18 consisting of a preheater 11, a humidifier 12, cooler 13 and reheater 14 is connected to a coating booth and an open air temp. sensor 9 and an open air humidity sensor 10 for measuring the present open air condition are provided on the atmospheric side of this air-conditioner 18 and their output signals are input into an operating machine 17. The operating machine 17 includes a memory and a CPU and an air condition and an air conditioning mode for reaching an target air conditioning region with the minimum energy are predetermined and stored in the memory. Then, a region where the measured present open air condition exists among a plurality of regions for the open air condition is selected and instruments constituting an air-conditioner are operated in accordance with an air conditioning mode corresponding to the selected region to condition the open air carried to the coating booth through the air-conditioner 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating booth air-conditioning control method and an apparatus directly used for implementing the method.

[0002]

2. Description of the Related Art A conventional paint booth air conditioner is connected to a paint booth, has a preheater, a humidifier, a cooler, and a reheater, and controls the temperature and humidity of outside air to a target air conditioning value and supplies it to the paint booth. . In conventional air-conditioning control of a paint booth, despite the fact that the target air-conditioning value has a certain control range, the current air-conditioning control is extremely accurate, so pinpoint control is performed on the target air-conditioning value. It is the actual situation. This will be specifically described with reference to FIG. The target air conditioning value is a temperature of 24 ° C and a relative humidity of 80% (on the moist air diagram,
It is assumed that the setting point 1) is set. Since the coating application generally has a control width of ± 1 ° C and ± 5%, when the outside air a at the set point 2 is harmonized on the moist air diagram, the temperature can be up to 23 ° C and 75% (point A). It should be in harmony, but at present, 24 ° C, 80% (setting point 1)
It is in harmony with. Similarly, when the outside air b at the point 3 on the moist air diagram is harmonized, 25 ° C, 85% (B
Point), but at present 24 ° C, 80%
It is in harmony with (setting point 1).

[0003]

However, the prior art has a problem that the control width cannot be utilized and excessive energy is wasted. An object of the present invention is to provide an air-conditioning control method and apparatus for a coating booth, which can suppress energy waste.

[0004]

The present invention to achieve the above object is as follows. (1) The air condition is divided into a plurality of regions, and the air condition in which the air condition in the region reaches the target air conditioner region having the control width with the minimum energy is determined in advance, and the current outside air condition is set. Of the plurality of regions of the air condition, the region in which the measured current outside air condition enters is selected, and the air conditioner component equipment is operated in accordance with the air conditioning mode corresponding to the selected region to operate the air conditioner. An air-conditioning control method for a coating booth, which consists of processes to harmonize the outside air sent through to the coating booth. (2) An air conditioner connected to the coating booth, which includes at least one of a preheater, a humidifier, a cooler, and a reheater, and the current outside air condition provided on the atmosphere side of the air conditioner is measured. A measurement sensor, control means connected to the air conditioner and the measurement sensor,
The control means divides the air condition into a plurality of areas, and stores an air conditioning mode for allowing each area to reach the target air conditioning area having a control width with the minimum energy. And a central processor unit that determines which air condition area the current outside air condition is included in which air conditioner mode to operate the air conditioner in. Air conditioning control device.

In the above method (1) and the above apparatus (2), the outside air condition has only to reach the target air conditioning area having a control range, so that the conventional target air conditioning value is almost pinpointed. Energy-saving air conditioning is performed by taking advantage of the management range compared to the case where

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an air conditioning controller for a coating booth according to an embodiment of the present invention will be described with reference to FIGS. 1 and 3 to 11 (of which FIG.
5 to 11 are shown on the air wetness diagram). As shown in FIG. 3, the air-conditioning control apparatus according to the embodiment of the present invention includes a preheater 1 connected to a coating booth.
1, an air conditioner 18 including at least one of a humidifier 12, a cooler 13, and a reheater 14, and a measurement sensor (outside air temperature sensor) provided on the atmosphere side of the air conditioner 18 for measuring the current outside air condition. 9 and an outside air humidity sensor 10), an air conditioner 18 and a measurement sensor 9, 1
Control means (calculator 17) connected to 0.

The arithmetic unit 17 which is the control means is composed of, for example, a computer and includes a memory (including a semiconductor memory or a RAM disk) and a CPU (central processor unit).

The memory divides the air condition into a plurality of areas (for example, 11 areas of FIG. 5, ..., (11)), and for each area, manages the air condition in the area. Air-conditioning mode to reach the target air-conditioning area (area of parallelogram (11) in Fig. 5) with minimum energy (Figs. 6 to 11).
, The air-conditioning modes shown corresponding to (11) are stored in advance. More specifically, in the examples of FIGS. 6 to 11, the warming, humidifying, and reheater modes are used when the outside air condition is in the region, and the reheater mode is used when the outside air condition is in the region. Cooling, reheater mode is used when conditions are in the area, humidification when outside air conditions are in the area,
Cooling mode, reheater mode is used, humidification mode is used when the outside air condition is in the region, cooling, reheater mode is used when the outside air condition is in the region,
Humidification mode is used when the outside air condition is in the area,
When the outside air condition is in the area, the reheater mode is used, when the outside air condition is in the area, the reheater mode is used, when the outside air condition is in the area (10), the humidification mode is used, and the outside air condition is When it is in the area (11), it is not air-conditioned.

Further, the central processor unit according to the control routine of FIG. 4, the current outside air condition (temperature T _out measured by the outside air temperature sensor 9 and input to the computer, measured by the outside air humidity sensor 10 and measured by the outside air humidity sensor 10 of FIG. The absolute humidity W _out , the relative humidity RW _out , and the enthalpy I _out calculated from the temperature and the relative humidity, which are input to the computer in steps 101 and 102, are included in any of the air condition regions (,, ..., (11)). Which region) is included in any of the air conditioning modes corresponding to the region
8 is activated (step 106 to FIG. 4).
128).

To set the target air conditioning area, the target temperature value (pinpoint) is given by the set temperature sensor 15 in FIG. 3, the target humidity value (pinpoint) is given by the set humidity sensor 16, and the control width is given by the arithmetic unit. Then, the parallelogram including the points A and B in FIG. 5 (the area (11) within the parallelogram in the setting window 6 in FIG. 5) is determined, and the temperature T _A corresponding to the points A and B is determined.
T _B, the absolute humidity W _A, W _B, relative humidity RW _A, RW _B,
The enthalpies I _A and I _B at points A and B calculated from temperature and relative humidity are set (steps 103 to 105 in FIG. 4).

The central processor unit further makes the following determinations in accordance with steps 106-128 of FIG. First, at step 106, the enthalpy I _A of point _A
And enthalpy I _out of the outside air are compared, and if I _out is less than I _A (when the temperature is low as in winter), step 10
Go to 7. In step 107, the outside air absolute humidity W _out is compared with the absolute humidity W _{A at the} point A, and if W _out <W _A , the process proceeds to step 108. In this case, the outside air condition is in the region of FIGS. 5 and 6, The heating, humidification, and reheater modes shown for the region in FIG. 6 are designated. In the heating mode, the absolute humidity (the iso-absolute humidity line extends right beside) is constant and the temperature rises, so in Fig. 6, the outside air condition progresses from left to right, and in the humidification mode the outside air enthalpy is constant (humidity increases). Enthalpy is constant because the temperature decreases and the energy decreases as the temperature decreases, and the isenthalpic line still extends from the upper left to the lower right), and from the lower right to the upper left in Fig. 6 along the constant enthalpy line. Then, the relative humidity increases obliquely (the isorelative temperature line extends from the lower left to the upper right), and in the reheater mode, the isohumid humidity line again travels from left to right toward point A. W in step 107
_{If out} <W _A is not satisfied, the routine proceeds to step 109, where the absolute humidity W _{out of the} outside air is compared with the absolute humidity W _B at the point B. W _out
If ≦ W _B , the process proceeds to step 111. In this case, the reheater mode is designated because it is in the area of FIG. In the reheater mode, after heating along the absolute humidity line in FIG. 7, the air is conditioned from left to right going straight to the outer line of the target air conditioning area. If W _B <W _out in step 109 (in this case, the target air-conditioning region does not occur unless the target air-conditioning region is considerably on the right side of the line of 100% relative humidity), the process proceeds to step 110, where the cooling and reheater modes are designated. Condition the air to reach B.

At step 106, the enthalpy of outside air I
_{If out} is greater than the enthalpy I _{A of} point A, step 11
Proceed to 2. At step 112, the enthalpy of outside air I
_It is determined whether _out is less than or equal to the enthalpy I _{B of} point B, and I
If _out> I _B (when the outside air temperature as summer is high),
Go to step 113. In step 113, the absolute humidity W _out of the outside air is compared with the absolute humidity W _B of the point B, and W _out > W _B
Then, the outside air condition is in the area shown in FIG. 6, so step 11
Proceed to step 5 to specify the cooling and reheater mode. In the cooling mode, the temperature decreases, so that the process proceeds from right to left in FIG. 6, and the moisture decreases and the absolute humidity also decreases, so the temperature decreases from top to bottom. When the absolute humidity reaches the absolute humidity W _B at the point B, the cooling is stopped, and the reheater is executed so that the point B is reached from left to right. W in step 113
Since ambient conditions if _out ≦ W _B is in the region of FIG. 7, the routine proceeds to step 114, humidification, cooling, specifies the record heater mode. In this case, as shown in FIG. 7, in the humidification mode, the enthalpy advances along the direction of the relative humidity,
Therefore, the cooling mode is switched to cool until the absolute humidity becomes equal to the absolute humidity W _B at the point B, and then heating is performed again in the reheater mode to reach the point B.

In step 112, I_A≤I_out≤I_BNara
Proceed to step 116. At step 116, the outside air is shut off.
Against humidity W_outIs the absolute humidity W at point A_AAbsolute humidity at point B
Degree W _BIt is judged whether or not it is below W_out> W_AOr W_out
> W_BIf so, proceed to step 117. W at step 117
_B<W_outWhether or not, W_B<W_outThen outside air conditions
Is in the area shown in Fig. 8, so set the cooling and reheater modes.
specify. In this case, the absolute humidity W of the outside air_outAt point B
Absolute humidity W_BUntil it equals, then reheater
-Switch to mode and reach point B along the iso-absolute humidity line
Harmonize the air up to. W at step 117_B<W_outso
W if not_out<W_ATherefore, the outside air conditions are as shown in Fig. 8.
Range, go to step 119 and specify the humidification mode
I do. In this case, go to the upper left along the isenthalpic line.
And humidify until the target air conditioning area (11) is reached.

W in step 116_A≤W_out≤W_BIn
If so, the process proceeds to step 120. In step 120, outside
Temperature T_outAnd the temperature T at point B_BAnd compare T_out≤T
_BOr not. T_out> T_BThen, the outside air condition is
Since it is in the area of No. 9, proceed to Step 121, and
Specify the mode. In this case, in FIG.
Move along the rupee line in the direction of high relative humidity, but the target
Condition the air until it reaches the air conditioning area (11). Step 1
T at 20_out≤T_BThen proceed to step 122,
Outside temperature T_outAnd the temperature T at point A_AAnd compare
T_A≤T_outOr not. T _A> T_outThen outside air
Since the conditions are in the area shown in Fig. 9, the reheater mode must be specified.
Set. In this case, from the left in FIG.
Go to the right and heat the air until it reaches the target air conditioning area
You.

If T _A ≤T _{out in} step 122, the process proceeds to step 124. At step 124, the outside air relative humidity R
W _out is compared with the relative humidity RW _B at point B, and RW _out ≤R
It is determined whether it is W _B. If RW _out > RW _B , the outside air condition is in the region of FIG. 10, so the routine proceeds to step 125, where the reheater mode is designated. In this case, the air is heated along the iso-absolute humidity line in the direction of high temperature, that is, from left to right in FIG. 9, until the target air conditioning region (11) is reached. If RW _out ≤ RW _{B in} step 124, the process proceeds to step 126. In step 126, the relative humidity RW _{out of the} outside air is compared with the relative humidity RW _A at the point A to determine whether RW _A ≤RW _out . If RW _A > RW _out , the outside air condition is shown in Fig. 9.
Since it is in the area (10), the humidification mode is designated. In this case, in FIG. 10, the air moves to the upper left along the isenthalpic line, but the air is heated until the target air conditioning region (11) is reached. If RW _A ≦ RW _out in step 126, the outside air condition is within the target air conditioning area (11) as shown in FIG. 11, so the routine proceeds to step 128, where no air conditioning is performed. In accordance with the control routine described above, each component 11, 1 of the air conditioner 18 of FIG.
2, 13, 14 are activated. Thereby, the outside air is adjusted to the air condition in the target air conditioning area while passing through the air conditioner 18, and then supplied to the coating booth.

Next, an air conditioning control method for the coating booth according to the embodiment of the present invention will be described with reference to FIGS. 1 and 3 to 11. In the coating booth air-conditioning control method according to the embodiment of the present invention, the air condition is divided into a plurality of areas (..., (11) in FIG. 5), and each area ,. , ..., (11) the air conditioning mode to reach the target air conditioning area with control width (area (11) in the setting window 6 of FIG. 5) with minimum energy (shown in FIGS. 6 to 11) Air conditioning mode)
Is determined in advance and the current outside air condition is measured (measurement by the outside air temperature sensor 9 and the outside air humidity sensor 10), and a region in which the current outside air condition is included among a plurality of regions of the air condition is selected (step 106, 107, 109, 1
12, 113, 116, 117, 120, 122, 12
4, 126), and specifies the air conditioning mode corresponding to the selected area (steps 108, 110, 11).
1, 114, 115, 118, 119, 121, 12
3, 125, 127, 128), and the air conditioner components (preheater 11, humidifier 12, cooler 13, reheater 14) are operated in accordance with the specified air conditioning mode, and painting is performed through the air conditioner 18. It consists of a process to harmonize the outside air sent to the booth.

FIG. 1 shows how the outside air is conditioned when air conditioning is controlled by the method according to the embodiment of the present invention, corresponding to FIG. As shown in FIG. 1, a setting window 6 having a width of ± 1 ° C. and a relative humidity of ± 5% with respect to a setting point 1 (for example, temperature 24 ° C., relative humidity 80%) (within this setting window 6) It is assumed that the air conditioning control is performed in the area (11) of (1) is the target air conditioning area. In that case, it is necessary to control the setting window 6 in a plurality of air conditioning modes depending on the outside air condition. Six air conditioning modes are shown in FIGS. 6 to 11, but two modes corresponding to FIG. 2 will be described below.

Since the enthalpy I _{out of the} outside air a at the set point 2 is smaller than the enthalpy I _{A at the} point A (winter season), the outside air a is heated, humidified, dried, and reheated to reach the point A. Conventionally, the set point 1 was made to reach the pinpoint, but in the present invention, it is only necessary to reach the point A having a smaller enthalpy. Therefore, the heating energy required to reach the set point 1 from the point A is not wasted as compared with the conventional case. The outside air b at the set point 3 has an enthalpy I _out larger than the enthalpy I _{B at the} point B (in the summer), so the outside air is humidified,
Apply cooling and reheater mode to reach point B.
Conventionally, the setting point 1 was reached, but in the present invention, it is only necessary to reach the point B having a large enthalpy. Therefore, as compared with the conventional case, the cooling energy required to reach the set point 1 from the point B is not wasted.

[0019]

According to the method of the first aspect, the outside air condition can reach the target air conditioning area having the control width, and therefore, one target air conditioning value can be reached almost pinpoint as in the conventional case. Compared with the case, air conditioning is performed to reduce energy by making full use of the management range. By the way, 10-2 compared to the conventional
You can get 0% energy reduction. According to the apparatus of claim 2, since the outside air condition needs to reach the target air conditioning area having the control width, compared with the case where the target air conditioning value of one point is reached almost pinpoint as in the conventional case, Energy-saving air conditioning is performed by making full use of the management range. By the way, energy reduction of 10 to 20% can be achieved compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a diagram showing, on an air wetting diagram, a locus of changes in outside air conditions when the outside air is harmonized by the method of the embodiment of the present invention.

FIG. 2 is a diagram showing, on an air wetting diagram, a locus of changes in outside air conditions when the outside air is harmonized by a conventional method.

FIG. 3 is a schematic plan view of an apparatus according to an embodiment of the present invention.

FIG. 4 is a flow chart of the control means of the apparatus of the embodiment of the present invention and the steps of the method of the embodiment of the present invention.

FIG. 5 is an air-wetting diagram showing a plurality of regions of air conditions (11) in the method and apparatus of the present invention.

FIG. 6 is a portion of the area of the method, apparatus of the present invention,
FIG. 3 is a diagram showing an air wetness diagram and a corresponding air conditioning mode.

FIG. 7 is a portion of the area of the method, apparatus of the present invention,
FIG. 3 is a diagram showing an air wetness diagram and a corresponding air conditioning mode.

FIG. 8 is a portion of the area of the method, apparatus of the present invention,
FIG. 3 is a diagram showing an air wetness diagram and a corresponding air conditioning mode.

FIG. 9 is a portion of the area of the method, apparatus of the present invention,
FIG. 3 is a diagram showing an air wetness diagram and a corresponding air conditioning mode.

FIG. 10 is a portion of the area of the method and apparatus of the present invention,
It is a figure which shows the air-moistening diagram which shows (10), and the air conditioning mode corresponding to it.

FIG. 11 is a part of the area of the method and apparatus of the embodiment of the present invention (11)
FIG. 3 is a diagram showing an air wetness diagram and a corresponding air conditioning mode.

[Explanation of symbols]

 6 Setting Window 9 Outside Air Temperature Sensor 10 Outside Air Humidity Sensor 11 Pre-heater 12 Humidifier 13 Cooler 14 Reheater 17 Computing Machine 18 Air Conditioner

Claims (2)

[Claims] 1. An air condition is divided into a plurality of regions, and an air condition mode for causing each region to reach the target air conditioner region having a control width with the minimum energy is set in advance, and the current condition is set. The outside air condition is measured, the region in which the measured outside air condition is present is selected from the plurality of regions of the air condition, and the air conditioner component equipment is operated according to the air conditioning mode corresponding to the selected region, and the air conditioning is performed. A method for controlling the air conditioning of a painting booth, which consists of steps to harmonize the outside air sent to the painting booth through a container. 2. A preheater connected to a coating booth,
A humidifier, a cooler, an air conditioner including at least one component of a reheater, a measurement sensor provided on the atmosphere side of the air conditioner for measuring the current outside air condition, and the air conditioner and the measurement sensor. And a control unit connected to the control unit, wherein the control unit divides the air condition into a plurality of regions and makes the air condition in each region reach a target air conditioning region having a control width with minimum energy. A memory for predetermining and storing an air conditioning mode, and a central processor unit for determining in which air condition region the current outside air condition is included and which air conditioning mode is to be operated corresponding to the region. An air-conditioning controller for the painting booth.