JPH08105637A - Air conditioner - Google Patents

Abstract

PURPOSE: To reduce the heat energy loss caused by humidifying and the running costs. CONSTITUTION: In an air-conditioner, air is controlled to a specified temperature and humidity after it is introduced from outside and cleaned. Heat exchangers 6P and 6R that serve as air heaters 4P and 4R and use steam as a heating medium are arranged in a cleaned air Path, and steam condenses to hot drain water as it passes through steam pipes of the heat exchangers 6P and 6R. The hot drain water is drained through drain pipes 9 and the drain pipes 9 are connected to a tank 10 that serves as a humidifying water source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for supplying conditioned air adjusted to a predetermined temperature and humidity into, for example, a coating booth.

[0002]

2. Description of the Related Art For example, in a coating booth, since the coating conditions change depending on the temperature and humidity inside the booth, it is known that the coating viscosity, the degree of atomization, the degree of dryness, etc. will change, and the coating finish will be uneven. Has been. Therefore, it has been conventionally practiced to make the coating finish uniform by keeping the temperature and humidity inside the coating booth constant.

FIG. 2 shows an air conditioner of this type. Air purified by a filter 31 is preheated by a preheater 32, then humidified by a humidifier (humidifying means) 33, and further heated by a reheater 34. It is usually constructed so that it is adjusted to a predetermined temperature and humidity (for example, temperature 20 ° C., humidity 80%) and supplied to a coating booth (not shown). In this case, the preheater 32 that serves as a heating means for the air
Of the reheaters 34, the reheater 34 that requires delicate temperature control often uses a heat exchanger using steam as a heat medium, and when extremely clean conditioned air is required. If a burner is used, the heated air may be contaminated with carbon. Therefore, not only the reheater 34 but also the preheater 32, a heat exchanger using steam as a heat medium is used.

On the other hand, as the humidifier 33, a shower type humidifier for spraying water into the passage of purified air is known.
By including water drops in the air, the humidity of the air is adjusted to a predetermined humidity (for example, 80%). Then, these preheater 32, humidifier 33, reheater 34
As a result, the temperature and humidity of the air are adjusted to the prescribed temperature and humidity.

[0005]

However, since the heat capacity of water is larger than that of air, the air heated by the preheater 32 is cooled depending on the temperature of the water sprayed from the humidifier 33. Since it has to be heated again by the reheater 34, there is a problem that a large amount of heat energy is lost. Therefore, the water supplied in the air conditioner is preheated to a constant temperature using the heat supplied by the preheater 32 (actual exploitation 63).
However, in this case as well, a large amount of heat energy is required to heat the cold water to warm water, which causes a problem of increased running cost. Therefore, it is a technical object of the present invention to reduce the loss of heat energy due to humidification and reduce the running cost.

[0006]

In order to solve this problem, according to the present invention, after the outside air is introduced and purified, a predetermined temperature /
In an air conditioner that regulates temperature and humidity to a specified humidity, a heat exchanger that uses steam as a heat medium is installed as a means for heating the outside air in a passage of purified air, and the heat exchanger is condensed through a steam pipe of the heat exchanger. A drain pipe for discharging hot water is connected to a tank serving as a humidifying water source of the humidifying means.

[0007]

According to the present invention, since the heat exchanger is arranged in the passage of the purified air, the heat of the steam supplied to the heat exchanger is taken by the purified air to heat the air to a predetermined temperature. At the same time, the steam is cooled and condensed in the steam pipe, and the hot water is discharged from the drain pipe and stored in the humidifying water source of the humidifying means. Therefore, the hot water is sent to the humidifying means as it is, and for example, the hot water is sprayed to humidify the purified air, so that the purified air is not cooled by the humidification. Further, since the hot water that has been conventionally discharged from the heat exchanger and discarded as is is used, the heat can be effectively used, and the loss of heat energy due to humidification and the running cost of the air conditioner are reduced. Remarkably reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments shown in the drawings. FIG. 1 is a flow sheet showing an air conditioner according to the present invention.

In this example, the Saran net 2 and the roll filter 3 are arranged on the outside air introduction port 1A side of the apparatus main body 1, and the preheaters 4P, 4P, A humidifying device (humidifying means) 5 and a reheater 4R are arranged. The preheater 4P and the reheater 4R are both formed of heat exchangers 6P and 6R using steam as a heat medium, and the steam supplied from the steam supply pipe 7 is arranged in each of the heat exchangers 6P and 6R. A drain pipe 9 that is connected to the heating coil (steam pipe) 8 and discharges the hot water condensed through the heating coil 8 is connected to the hot water tank 10 so that the heat discharged from the heat exchangers 6P and 6R is discharged. Water is stored in the hot water tank 10.

The humidifying device 5 includes a warm water shower device 13 for spraying hot water stored in the tank 10 from the shower nozzle 12 by the pump 11, and a water shower device 17 for spraying water stored in the tank 14 from the shower nozzle 16 by the pump 15. Consists of. In addition, 18 and 19 are the apparatus main body 1
A temperature sensor and a humidity sensor that measure the temperature of the conditioned air that has been temperature-controlled and humidity-controlled by passing through the inside.

The above is an example of the configuration of the present invention, and its operation will be described below. First, when steam is supplied to the preheater 4P and the reheater 4R to heat the inside of the apparatus main body 1 to introduce the outside air, the outside air is heated by the preheater 4P, and the heat of the steam supplied to the heating coil 8 is taken away. The steam is condensed into hot water of 70 to 80 ° C., discharged from the drain pipe 9 and stored in the hot water tank 10.

The hot water stored in the hot water tank 10 is supplied to the shower nozzle 12 by the pump 11 and sprayed into the air. At this time, the temperature of the hot water sprayed in the air is about 40 to 50 ° C., so that the purified air is not cooled by humidification, and the condensed water contains impurities like the distilled water. It does not pollute the purified air.

Finally, when it passes through the reheater 4R, it is heated to a predetermined temperature and supplied to a coating booth or the like. Here, too, the heat of the steam flowing in the heating coil 8 of the reheater 4R is taken away, so the steam is It is condensed into hot water, discharged from the drain pipe 9 and stored in the hot water tank 10.

The temperature and humidity of the conditioned air are constantly monitored by the temperature sensor 18 and the humidity sensor 19. If the temperature does not reach the predetermined temperature, the flow rate of steam supplied to the preheater 4P and the reheater 4R should be increased. Due to
Increase the amount of heat supplied and adjust to reach a predetermined temperature.
Further, when the predetermined humidity is not reached, the amount of hot water sprayed from the shower nozzle 12 by the pump 11 is increased, and when it is still insufficient, water is sprayed from the shower nozzle 16. In this case, the temperature of the water is usually lower than the set temperature of the conditioned air, and the conditioned air is cooled by spraying water, but this cold water is not the only humidifier, but the warm water. Since it is sufficient to spray only the portion that is not enough with humidification, the temperature drop of the purified air can be minimized.

The drain pipe 9 is provided with a steam trap T for separating steam and hot water, and a pipe 20 for taking out steam not condensed by the heating coils 8 of the preheater 4P and the reheater 4R is branched from the steam trap T. If it is connected to a heating coil 21 formed on the bottom surface of the tank 14 that stores water, the tank 14 can be provided without a separate heat source.
Since the water inside can be heated, the water shower device 1
The temperature drop of the purified air due to the water sprayed from No. 7 can be further reduced. Further, since most of the steam is condensed in the heating coil 21, if it is collected in the tank 10, water can be effectively used, and heat waste and water waste can be eliminated.

Further, in the embodiment, the heat exchangers 6P and 6 using steam as a heat medium for both the preheater 4P and the reheater 4R.
The case where R is used has been described, but if only one of them is a heat exchanger using steam as a heat medium, the other may be a heater of a different type.

[0017]

As described above, according to the present invention, the hot water condensed by passing through the steam pipe of the heat exchanger using steam as a heat medium is stored and humidified by spraying the hot water. Unlike the case of spraying cold water for humidification, the temperature of purified air does not drop, and it is not necessary to preheat the sprayed water. It has a very excellent effect that the loss and the running cost of the air conditioner can be remarkably reduced.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an air conditioner according to the present invention.

FIG. 2 is a flow sheet showing a conventional device.

[Explanation of symbols]

 1 ... Device main body 4P ... Preheater (heating means) 4R ... Reheater (heating means) 5 ... Humidification device (humidification means) 6P ... Heat exchanger 6R ... Heat exchanger 7 ... Steam supply Pipe 8 ... Heating coil (steam pipe) 9 ... Drain pipe 10 ... Hot water tank

Claims (1)

[Claims] 1. A predetermined temperature /
In an air conditioner that regulates temperature and humidity to a specified humidity, heat exchangers (6P, 6R) that use steam as a heat medium are installed in the purified air passages as air heating means (4P, 4R). Exchanger
A drain pipe (9) for discharging hot water condensed through the steam pipes (8) of (6P, 6R) is connected to a tank (10) serving as a humidifying water source of the humidifying means (5). Air conditioning system to.