JP2001241733A - Apparatus and method for controlling temperature and humidity of air conditioner and medium recording temperature/ humidity control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure painting with water paint under identical painting conditions throughout the year by exhibiting moisture contained in that paint appropriately regardless of the temperature in a painting booth. SOLUTION: A state line where the saturation curve (S) on a psychrometric chart is shifted, as a target temperature and humidity curve of conditioned air being supplied to a painting booth, by a predetermined absolute humidity to the low humidity side along an isothermal line up to a position passing through an ideal state point (P0) representative of the ideal temperature and humidity of the painting booth is set such that the quantity of moisture which can be contained until conditioned air and air at the ideal state point are saturated will be constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature and humidity control of an air conditioner in which the inside of the booth is set to an optimum atmosphere according to a paint to be used by supplying conditioned air adjusted to the temperature and humidity of the outside air to a coating booth. The present invention relates to an apparatus and a temperature / humidity control method.

[0002]

2. Description of the Related Art FIG. 3 shows a general air conditioner for adjusting the outside air to a predetermined temperature and humidity and a temperature and humidity control device thereof (see Japanese Patent Application Laid-Open No. 11-83129). In FIG. 3, an air conditioner 1 is connected to an outside air inlet 2 through an air-conditioned air supply port 3.
A pre-heater 5 for performing pre-heating, an adiabatic humidifying device 6 such as a washer, a cooling device 7 and a temperature and humidity controlling device 4 such as a re-heater 8 for performing post-heating are arranged along an air flow path leading to the air conditioning air supply. The supply port 3 is provided with a blower fan 9 for sending out the conditioned air generated by the temperature and humidity control device 4 to a painting booth (not shown).

[0003] temperature and humidity control device controller 50 for performing temperature and humidity control of 4, the outside air temperature and humidity data detected by the temperature and humidity meter TH _1, the temperature and humidity of the conditioned air detected by the temperature and humidity meter TH ₂ Based on the heating capacity of the preheater 5, the humidifying capacity of the adiabatic humidifying device 6, the cooling capacity of the cooling device 7,
Is variably controlled.

In this case, the temperature of the outside air is adjusted so as to reach an arbitrary state point on the target temperature / humidity line K connecting the upper limit state point Qmax and the lower limit state point Qmin. , A constant relative humidity line (for example, 75%).

In the coating booth to which the conditioned air generated by the air conditioner is supplied, the relative humidity is maintained substantially constant regardless of the temperature, so that the paint sprayed from the coating machine floats in the air. Until it is applied to the substrate, the organic solvent contained in the individual atomized paint particles volatilizes moderately, preventing sagging and unevenness during application, and maintaining the same The coating can be performed under the coating conditions, and a coating film of a constant quality is formed.

[0006]

In recent years, however, the use of water-based paints has been increasing over a wide range of application fields as emission regulations for organic solvents have become more stringent. In particular, in the field of automotive coatings, in order to meet the emission regulations for organic solvents, a shift from conventional organic solvent-based coating to coating using water-based coatings is being made.

However, when the coating booth is coated with the water-based paint while keeping the relative humidity constant, when the temperature in the coating booth is high, the paint sprayed from the coating machine floats in the air to the object to be coated. Until it is applied, the water contained in the atomized individual paint particles volatilizes moderately, but if the temperature in the coating booth is low, the water contained in the paint particles does not volatilize sufficiently. It has been found.

If the amount of water contained in the paint particles to be applied is large, not only may the coating film be sagged or uneven, but also if it is baked and dried, air bubbles are generated due to rapid evaporation. There is a possibility of causing poor coating such as bubble)
It has been difficult to form a coating of constant quality throughout the year.

Accordingly, the present invention provides a method of applying a water-based paint to an appropriate coating medium so that water contained in the paint is appropriately volatilized irrespective of the temperature in the paint booth, thereby preventing defective coating. It is a technical task to make it possible to always perform painting under the same painting conditions.

[0010]

In order to solve this problem, the invention of claim 1 is provided with a temperature and humidity control device for adjusting the temperature and humidity of the outside air to generate conditioned air to be supplied to a coating booth. In the temperature / humidity controller of the air conditioner, the target temperature / humidity line representing the target temperature / humidity of the conditioned air is converted to an isothermal line until the saturation line of the air diagram passes through the ideal state point representing the ideal temperature / humidity of the painting booth. A state line moved by a certain absolute humidity to the low humidity side is set along, and the state point of the conditioned air generated by the air conditioner is incorporated into the air conditioner so that it matches the state point on the target temperature and humidity line According to another feature of the present invention, there is provided an arithmetic unit which outputs a control signal for performing a preheating operation, an adiabatic humidification operation, a cooling operation, or a post-heating operation to the outside air to the outside air in accordance with a state point of the outside air.

According to a second aspect of the present invention, there is provided a temperature / humidity control method for an air conditioner for adjusting the temperature / humidity of outside air to generate air-conditioning air to be supplied to a coating booth. As a line, set a state line that has been moved by a certain absolute humidity to the low humidity side along the isothermal line until the saturation line of the air chart passes through the ideal state point representing the ideal temperature and humidity of the painting booth, and air conditioning Preheating operation, adiabatic humidification operation, and cooling of the outside air according to the state point of the outside air introduced into the air conditioning system so that the state point of the conditioned air generated by the device matches the state point on the target temperature and humidity line. An operation or a post-heating operation is performed.

Further, according to a third aspect of the present invention, there is provided a recording medium recording a temperature / humidity control program for an air conditioner having a temperature / humidity control device for adjusting the temperature / humidity of the outside air to generate conditioned air to be supplied to a coating booth. As an air chart table in which an air chart showing air state values in coordinates is set, and a target temperature / humidity line indicating a target temperature / humidity of the conditioned air, a saturation line of the air chart is a paint booth. A target temperature / humidity line setting step of setting, on an air chart, a state line moved by a constant absolute humidity to a low humidity side along an isotherm to a position passing through an ideal state point representing ideal temperature / humidity; An outside air state point setting step of detecting the temperature and humidity of the outside air to be taken in and setting the outside air state point on the psychrometric chart; and detecting the temperature and humidity of the conditioned air generated by the air conditioner to detect the conditioned air state point. Air conditioning on the psychrometric chart Pre-heating the outside air according to the state point of the outside air introduced into the air conditioner so that the state point of the conditioned air generated by the air conditioner matches the state point on the target temperature / humidity line. Outputting a control signal for performing an operation, an adiabatic humidification operation, a cooling operation or a post-heating operation to the temperature and humidity control apparatus.

According to the first to third aspects of the present invention, as the target temperature / humidity line, the saturation line of the psychrometric chart passes along the isotherm to a position passing through the ideal state point representing the ideal temperature / humidity of the coating booth. It is set by moving a certain absolute humidity to the low humidity side. Then, by performing adiabatic humidification, cooling or heating in accordance with the temperature and humidity of the outside air, the temperature and humidity are controlled so that the state point of the conditioned air matches the state point on the target temperature and humidity line.

At any point on the target temperature and humidity line, the absolute humidity difference from the state point of the saturation line on the isotherm is constant, and the amount of water that can be contained before the air is saturated is: It is equal to the amount of water that can be contained before the air at the ideal state point saturates, in other words, the volatility of water is equal to the air at the ideal state point that is most suitable for painting.

Therefore, when painting with a water-based paint,
By supplying such controlled air-conditioned air to the painting booth, the moisture contained in the paint evaporates to the same extent as when painted in an atmosphere at the ideal state point, regardless of the temperature, and an optimal coating film is formed. Will be done.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a temperature and humidity control device for an air conditioner according to the present invention, and FIG. 2 is an air line diagram for explaining a control method thereof.

In FIG. 1, an air conditioner 1 has a preheater 5 for preheating, an adiabatic humidifier 6 such as a washer, and a cooling temperature along an air flow path from an outside air inlet 2 to an air supply port 3. For example, a cooling device 7 set at 20 ° C.
A temperature and humidity control device 4 such as a reheater 8 for performing post-heating is provided, and the conditioned air generated by the temperature and humidity control device 4 is supplied to an air conditioning air supply port 3 to a painting booth (not shown). A blower fan 9 for sending out air is provided.

The temperature and humidity control device controller 10 for performing temperature and humidity control of 4, a thermo-hygrometer TH ₁ for detecting the outside air temperature and humidity on the input side, thermo-hygrometer TH for detecting the temperature and humidity of the conditioned air ₂ is connected to the output side, and the articulation and humidity control device 4 is connected to the output side. Based on the data detected by the thermo-hygrometers TH ₁ and TH ₂ , the heating capacity of the pre-heater 5 and the humidification of the adiabatic humidification device 6 Variable control of the capacity, the cooling capacity of the cooling device 7 and the heating capacity of the reheater 8 is performed.

The temperature / humidity control device 10 is provided with a state value of air.
Charts such as tx charts, ix charts, etc.
Table 11 with the setting and the atmosphere in the painting booth
Ideal state point P representing ideal temperature and humidity₀The air
An ideal state point setter 12 to be set on a diagram, and a target temperature and humidity line
Target temperature / humidity line setting device 13 for setting L in the air chart
And temperature and humidity meter TH₁Based on the outside air temperature and humidity detected in
Mushroom outside air state point P₁Is set in the above air chart
State point setter 14 and thermo-hygrometer TH₂ Air conditioning detected in
Based on the temperature and humidity of the air, the air-conditioning air state point P₂The above
Equipped with air-conditioning air state point setter 15 to be set in the psychrometric chart
And the outside air state point P on the psychrometric chart₁And conditioned air condition
Point P₂Temperature and humidity control device 4 of air conditioner 1 based on the position of
Is provided.

The ideal state point P ₀ to be set in an ideal state point setter 12 is determined by the coating temperature and humidity conditions optimal in accordance with the water-based paint used, in this example, temperature of 25 ° C., 70% relative humidity (Absolute humidity 14 g / kg) is set.

The target temperature and humidity line setting unit 13, moving as the target temperature and humidity line L, saturation line S of psychrometric chart only constant absolute humidity to low humidity side along the isotherm to a position passing through the ideal state point P ₀ Set the status line. That is, the state point on the target temperature and humidity line L on the isotherm and the state point on the saturation line S are:
The absolute humidity difference is constant everywhere, and the ideal state point P
_It is equal to the absolute humidity difference between ₀ and the state point on the saturation line S on its isotherm.

[0022] Accordingly, any state point on the target temperature and humidity line L, the amount of water can be included before the air is saturated can air the ideal state point P ₀ is be included in until saturated equal to the water content, in other words, equal to the volatilization ease of moisture when painted in the most suitable atmosphere ideal state point P ₀ to the painting.

In this embodiment, the upper limit state point Pmax of the target temperature / humidity line L is a temperature of 28 ° C. and a relative humidity of 75% (18 g / kg absolute humidity), and the lower limit state point Pmin is a temperature of 18 ° C. and a relative humidity of 55%. (Absolute humidity 7 g / kg).
The absolute humidity difference between the state point of the target temperature / humidity line L and the state point of the saturation line S on the isothermal line is set to 6 g / kg.

The arithmetic unit 16, as the state point P ₂ of the conditioned air generated by the air conditioner 1 is coincident with any state point on the target temperature and humidity line L, the outside air in a state of incorporating into the air conditioner 1 In accordance with the point P ₀ , a control signal for performing a pre-heating operation, an adiabatic humidification operation, a cooling operation or a post-heating operation on the outside air is output to the temperature and humidity control device 4.

In this embodiment, the target temperature / humidity line L, the iso-absolute humidity lines Hmax and Hmin extending from the upper limit state point Pmax and the lower limit state point Pmin to the low temperature side, and the isoenthalpy lines Emax and Emin extending to the low relative humidity side. , The heating and humidification control area A ₁ , the humidification control area A ₂ , and the humidification and cooling control area A by the cooling line C extending to the high temperature side through the upper limit state point Pmax.
_3, the heating control area _{A 4,} cooling heating control area A
₅ , which are divided into five regions.

The following control operation is performed for each of the control areas A _{1 to} A ₅ according to the position of the outside air state point P ₁ . When the outside air state point P ₁ is in the heating and humidification control area A ₁ , the isenthalpy line Emin by the preheater 5
Heating operation until the temperature reaches the lower limit state point Pmin
Until the temperature reaches the adiabatic humidifier 6.
When the outside air state point P ₁ is in the humidification control area A ₂ performs the humidifying operation by the adiabatic humidifier 6 to reach the target temperature and humidity line L. When the outside air state point P ₁ is in the humidification cooling control area A _3, after performing humidification operation by adiabatic humidifier 6 to reach the cooling line C, for cooling operation by the cooling device 7 to reach the upper limit state point Pmax . When the outside air state point P ₁ is in the heating control area A ₄ performs the heating operation by Rehita 8 to the target temperature and humidity line L. When the outside air state point P ₁ is in the cooling and heating control area A ₅ are, after cooling operation by the cooling device 7 to reach a constant absolute humidity line Hmax, the heating device until a limit state point Pmax 8
Is performed.

Then, the heating capacity of the pre-heater 5
Humidification capacity by thermal humidifier 6 and cooling capacity by cooling device 7
Volume and heating capacity by the reheater 8 are outside air at the start of operation.
Attitude P₁Is determined according to the position of
Conditioning point P₂ Between the point and the state point on the target temperature and humidity line L
, Whereby the state point P of the conditioned air
₂Control to match the state point on the target temperature and humidity line L
Is done.

In the above description, the target temperature / humidity line setting unit 13, the outside air state point setting unit 14, the conditioned air state point setting unit 15, and the processing procedure performed by the arithmetic unit 16 each record a temperature control program. It corresponds to the target temperature / humidity line setting step, the outside air state point setting step, the conditioned air state point setting step, and the control signal output step of the recording medium.

The above is an example of the temperature / humidity control device of the air conditioner controlled by the recording medium storing the temperature / humidity control program according to the present invention. Next, the temperature / humidity control method using the same will be described.

The control unit 10 simultaneously starts the operation of the air conditioner 1 is started, first, is detected outside air temperature and humidity incorporated into the air conditioner 1 by temperature and humidity meter TH _1, the air line by the outside air state point setter 14 outside air state point P ₁ is set to the psychrometric chart of FIG table 11.

Next, the outside air state point P₁Exists
Each control area A₁~ A ₅Temperature and humidity control device 4 suitable for
Selected and operated, and the outside air
The temperature and humidity are adjusted by passing, and conditioned air is generated
Is done. And the temperature and humidity meter TH₂Due to the temperature of the conditioned air
Humidity is detected, and the air conditioner
In the psychrometric chart of the psychrometric chart table 11, the conditioned air state point P₂But
Is set.

Here, the detected conditioned air state point P ₂
Is compared with the target temperature / humidity line L, and the air-conditioning air state point P ₂
Is equal to an arbitrary state point on the target temperature / humidity line L,
The heating capacity of the preheater 5, the humidification capacity of the adiabatic humidifier 6, the cooling capacity of the cooling device 7, and the heating capacity of the reheater 8 are variably controlled. In this manner, when the conditioned air is generated is thrown into the coating booth, the atmosphere in the painting booth substantially equal to the air-conditioning air state point P _2.

The target temperature and humidity line L, only the ideal constant absolute humidity along the isotherm to the low humidity side to a position passing through the ideal state point P ₀ representing the temperature and humidity of the saturation line S paint booth psychrometric chart The absolute humidity difference from the state point of the saturation line S on the isotherm is constant everywhere at the state point on the target temperature / humidity line L because it is set by moving, and until the air is saturated. amount of water that can be included in is equal to the amount of water that can be air in the ideal state point P ₀ is included in until saturated, in other words, volatility and ease of moisture,
Equal to the ideal state point P ₀ the most suitable for the painting.

Therefore, when painting with a water-based paint,
By supplying such controlled air-conditioned air to the painting booth, the moisture contained in the paint evaporates to the same extent as when painted in an atmosphere at the ideal state point, regardless of the temperature, and an optimal coating film is formed. Will be done.

A pre-heater 5, an adiabatic humidifier 6, a cooling device 7, and a re-heater 8 are provided as the temperature and humidity control device 4.
Although a case has been described in which the psychrometric chart is divided into _five control areas A _{1 to} A ₅ for control, in an area where the outside air state point P ₁ is climatically located only in the control area A ₂ throughout the year, the temperature control is performed. The present invention can be applied to a case where only the adiabatic humidifier 6 is used as the humidifier 4 and only control for performing adiabatic humidification operation on the outside air is performed.

[0036]

As described above, according to the present invention, since the air at any state point on the target temperature / humidity line has the same volatility as the air at the ideal state point, the water is applied with the water-based paint. In this case, the moisture contained in the paint will evaporate to the same degree as when painted in the atmosphere at the ideal state point regardless of the temperature in the paint booth.
There is no danger of coating defects such as unevenness and bubbles, and a very excellent effect that a good quality coating film can be formed throughout the year.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a temperature and humidity control device for an air conditioner according to the present invention.

FIG. 2 is an air line diagram showing a temperature and humidity control method for an air conditioner according to the present invention.

FIG. 3 is an explanatory view showing a conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air-conditioning device 4 ... Temperature and humidity control device 10 ... Control device 11 ... Pneumatic chart table 13 ... Target temperature / humidity line setting device 14 ... Outside air state point setting device 15 ... ...... conditioned air state point setter 16 ......... arithmetic unit P 0 _......... ideal state point P 1 _......... outside air state point P 2 _......... conditioned air state point L ............ target temperature and humidity line S ... ............ Saturation line

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Takayama Yamamoto, Inventor 1-9-9 Kakimotocho, Toyota-shi, Aichi Prefecture Trinity Industry Co., Ltd. F-term (reference) 3L060 AA06 AA07 CC03 CC06 DD02 EE23 EE24 EE25

Claims (3)

[Claims] A temperature and humidity control device for an air conditioner provided with a temperature and humidity control device (4) for adjusting the temperature and humidity of outside air to supply the air to be supplied to a coating booth. As the target temperature / humidity line (L), the saturation line (S) in the psychrometric chart moves to the low humidity side along the isothermal line until it passes through the ideal state point (P ₀ ) representing the ideal temperature and humidity of the coating booth. A state line moved by a certain absolute humidity is set, and air conditioning is performed so that the state point (P ₂ ) of the conditioned air generated by the air conditioner (1) matches the state point on the target temperature / humidity line (L). According to the state point (P ₁ ) of the outside air introduced into the device (1), a control signal for performing a pre-heating operation, an adiabatic humidification operation, a cooling operation or a post-heating operation is supplied to the outside air. A temperature and humidity control device characterized by comprising an arithmetic device (16) for outputting the temperature and humidity to the control device. 2. A temperature / humidity control method for an air conditioner for adjusting the temperature / humidity of outside air to generate air-conditioning air to be supplied to a coating booth, wherein a target temperature / humidity line (L) representing a target temperature / humidity of the air-conditioned air is used as air. Set a state line that has been moved by a certain absolute humidity to the low humidity side along the isothermal line until the saturation line (S) in the diagram passes through the ideal state point (P ₀ ) representing the ideal temperature and humidity of the painting booth. The state of the outside air introduced into the air conditioner (1) such that the state point (P ₂ ) of the conditioned air generated by the air conditioner (1) matches the state point on the target temperature / humidity line (L). A temperature / humidity control method comprising performing a preheating operation, an adiabatic humidification operation, a cooling operation, or a postheating operation on the outside air according to a point (P ₁ ). 3. Adjusting the temperature and humidity of the outside air and supplying it to the painting booth
Equipped with a temperature and humidity control device (4) for producing conditioned air
Storage medium storing the temperature and humidity control program of the
The air on which the psychrometric chart representing the state values of air
A chart table (11) and a target temperature / humidity line (L) representing the target temperature / humidity of the conditioned air
The saturation line (S) in the psychrometric chart shows the ideal temperature of the painting booth.
Ideal state point (P₀) To the point passing through
Status line moved by a certain absolute humidity to the low humidity side along
Target temperature and humidity line setting step (1)
3) and detecting the temperature and humidity of the outside air taken into the air conditioner (1)
The outside air state point (P ₁) Is set on the psychrometric chart
Attitude setting step (14), detecting the temperature and humidity of the conditioned air generated by the air conditioner (1)
The conditioned air state point (P₂) Is set on the psychrometric chart
Air conditioning air state point setting step (15);₂) Is on the target temperature and humidity line (L)
Incorporated in the air conditioner (1) to match the attitude
Outside air state point (P₁) According to the pre-heating operation
Operation, adiabatic humidification operation, cooling operation or post-heating operation
Control signal output for outputting a control signal to the temperature and humidity control device (4)
Temperature and humidity control of an air conditioner comprising a power step (16)
A recording medium on which a program is recorded.