JPH10267321A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the operation of an air conditioner not affected by outside temperature by arranging a preheating coil on a upstream side, a cooed dehumidifying coil on a down stream side inside a casing provided with an air washer and a piping supplying cold water from heat source from the outlet of the dehumidifying coil to the inlet of the preheating coil between both coils. SOLUTION: The outside air taken in from an air intake part 31a being removed with dust with a pre-filter 32 and a medium performance filter 33 in summer time operation is cooled by the preheating coil 34 of a runaround circuit 46. The runaround circuit 46 is arranged for introducing cold water into the inside of a cool dehumidifying coil 38 and introducing the air to the inside of the preheating coil 34 through a piping 45 after cool dehumidifying the air coming out from an air washer 44. The outside air cooled by the preheating coil 34 is transferred to the air washer 44 through an eliminator 35 and the circulating water is sprayed on it. Then, the cooled and dehumidified air is flowed into the cool dehumidifying coil 38 and supplied to a clean room after cool dehumidification.

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 performing outside air processing for clean room air conditioning.

[0002]

2. Description of the Related Art Conventionally, an air conditioner (external air conditioner) for performing outside air processing of a clean room air conditioner is attached to a clean room as disclosed in, for example, JP-A-8-82432. Also, various air conditioners incorporating an air washer for the purpose of removing chemical gas have been proposed. Air washers not only remove air dust,
It has been recognized that it is also effective in removing chemical gas, and has been actively used in the exterior equipment of clean rooms.

FIG. 5 shows an air conditioner A for applying outside air for clean room air conditioning, which was previously filed by the applicant (Japanese Patent Application No. 9-63536). Air inlet 1a and air outlet 1b
In the casing 1 provided with a filter, a pre-filter 2, a medium-performance filter 3, a preheating coil 4, an eliminator 5, a water sprayer 6, an eliminator 7, a cooling and dehumidifying coil 8 are arranged from the air introduction part 1a to the air outlet part 1b. , Fan 9 in this order.

A tank 10 is provided below the water atomizer 6.
And water (pure water) in the tank 10 is pumped by a pump 11.
Can be used repeatedly. Further, a heat exchanger 13 is interposed in the pipe 12 provided with the pump 11 so as to supply necessary heat energy to water.
Here, water sprayer 6, tank 10, pump 11, pipe 1
2. An air washer 14 is formed by the heat exchanger 13.

The preheating coil 4 is connected to a heating heat source via pipes 15 and 16 so that hot water can be supplied. Further, the cooling and dehumidifying coil 8 is connected to a heat source (refrigerator) via a cold water inlet pipe 17 and a cold water outlet pipe 18 so that cold water can be supplied. According to the air conditioner A,
In the summer, when outside air is taken in from the air introduction part 1a with the preheating coil 4 stopped, the pre-filter 2
After the foreign matter such as dust is removed by the medium-performance filter 3, the dust is sent out to the air washer 14 via the eliminator 5, and circulating water at, for example, about 27 ° C. is sprayed on the taken-in outside air. For example, as shown in FIG.
The outside air at a temperature of 28 ° C. and a humidity of 95% is humidified and washed at a temperature of 28 ° C.

Thereafter, the humidified air flows into the cooling and dehumidifying coil 8 through the eliminator 7. Since cooling water of, for example, 7 ° C. is supplied from the refrigerator to the cooling and dehumidifying coil 8, the air in the cooling and dehumidifying coil 8 has a temperature of 1 ° C.
Cooled and dehumidified to 1 ° C and 95% humidity. After that, fan 9
Is supplied to the clean room at a temperature of 11.5 ° C. and a humidity of 90%.

On the other hand, from the middle season to the winter season, warm water is supplied to the preheating coil 4, and when outside air is taken in from the air introduction part 1 a, the pre-filter 2 and the medium-performance filter 3 cause the pre-filter 2 and the medium-performance filter 3 to remove impurities such as dust. Is removed, and is heated by the preheating coil 4. For example, as shown in FIG.
Outside air at 4 ° C. and 50% humidity is heated to 5 ° C. and 5% humidity. Thereafter, the heated air is sent out to the air washer 14 via the eliminator 5, and the taken-in outside air is sprayed with, for example, circulating water at 20 ° C., and is humidified and washed at a temperature of 15 ° C. and a humidity of 80%.

Thereafter, the humidified air flows into the cooling and dehumidifying coil 8 via the eliminator 7. Since cooling water of, for example, 7 ° C. is supplied from the refrigerator to the cooling and dehumidifying coil 8, the air in the cooling and dehumidifying coil 8 has a temperature of 1 ° C.
Cooled and dehumidified to 1 ° C and 95% humidity. After that, fan 9
Is supplied to the clean room at a temperature of 11.5 ° C. and a humidity of 90%.

As described above, in the conventional air conditioner A shown in FIG. 5, it is necessary to incorporate the preheating coil 4 which is a device for winter which is not used in summer, and the size of the device is increased. In addition, since the cooling and dehumidifying coil 8 performs cooling and dehumidification even in winter, it is necessary to operate the refrigerator also in winter. In order to solve such a problem, an air conditioner B incorporating the run-around sensible heat exchanger 23 shown in FIG.

In the air conditioner B, a cooling and dehumidifying coil 19 is provided upstream of the cooling and dehumidifying coil 8 in the air conditioner A shown in FIG. 5, and the cooling and dehumidifying coil 19 and the preheating coil 4 are connected by pipes 20 and 21. The cooling medium is circulated by the heat medium pump 22 in communication therewith. According to the air conditioner B, the operation of the run-around type sensible heat exchanger 23 is stopped in the summer, so that the process is performed in the same manner as the air conditioner A shown in FIG. 5, as shown in FIG. You.

On the other hand, from the middle season to the winter season, when outside air is taken in from the air introduction part 1a, foreign substances such as dust and dirt are removed by the pre-filter 2 and the medium-performance filter 3, and then the pre-heating coil 4 Warmed up. As shown in FIG. 10, for example, as shown in FIG. 10, the preheating coil 4 is heated by a heat medium heated to 8 ° C. to 9 ° C. by heat recovered by the cooling and dehumidifying coil 19 constituting the run-around sensible heat exchanger 23. In the case of outside air at a temperature of -4 ° C and humidity of 50%, a temperature of 5 ° C and humidity of 25%
Heated. Thereafter, the heated air is sent out to the air washer 14 via the eliminator 5, and the taken-in outside air is sprayed with, for example, circulating water at 25 ° C.
It is humidified and washed at 85 ° C. and 85%.

Thereafter, the humidified air flows into the cooling and dehumidifying coil 19 constituting the run-around sensible heat exchanger 23 via the eliminator 7. In the cooling and dehumidifying coil 19, the air is heated to a temperature of 11 ° C. and a humidity of 95 ° C. by the heat medium of 7 ° C. to 8 ° C. cooled by the outside air in the preheating coil 4.
% Dehumidified by cooling. Thereafter, the air is supplied to the clean room by the fan 9 at a temperature of 11.5 ° C. and a humidity of 90%.

As described above, according to the air conditioner B, in the winter season, it is possible to cool the outside air using the run-around sensible heat exchanger 23, and it is necessary to use a refrigerator like the air conditioner A. And the preheating coil 4
The heat recovered by the cooling and dehumidifying coil 19 constituting the run-around sensible heat exchanger 23 can be used as a heat source to the heat exchanger.

[0014]

However, in the air conditioner B, since the run-around sensible heat exchanger 23 is incorporated in the air conditioner A shown in FIG. Since the wet coil 19 is required and the run-around sensible heat exchanger 23 is stopped in the summer, the run-around sensible heat exchanger 23 which is a winter equipment not used in the summer is used. There is a problem that it has to be incorporated, which causes a cost increase.

In particular, when the outside air temperature is 7 ° C. to 15 ° C., the outside air cooling effect cannot be used. The present invention has been made to solve such a problem, and its purpose is to:
In winter, incorporating a run-around sensible heat exchanger,
An object of the present invention is to provide an air conditioner that can be operated even in summer.

[0016]

According to the first aspect of the present invention,
In a casing equipped with an air washer, a preheating coil is arranged upstream of the air washer and a cooling and dehumidifying coil is arranged downstream, and between the preheating coil and the cooling and dehumidifying coil, cold water from a heat source is cooled and cooled on the downstream side. A pipe for supplying from the outlet of the wet coil to the inlet of the preheating coil on the upstream side is provided.

According to a second aspect of the present invention, a preheating coil, an air washer, and a cooling and dehumidifying coil are provided in a casing having an air inlet and an air outlet in a direction from the air inlet to the air outlet. A pipe is provided between the preheating coil and the cooling and dehumidifying coil to supply cold water from the heat source from the outlet of the cooling and dehumidifying coil to the inlet of the preheating coil, and a pipe is provided in the preheating coil to return the cold water to the heat source. In addition, the cooling and dehumidifying coil is provided with a conduit for introducing cold water from a heat source.

According to a third aspect of the present invention, in the air conditioner according to the first or second aspect, the cold water outlet pipe communicating with the outlet of the preheating coil and the cold water introducing pipe communicating with the inlet of the cooling and dehumidifying coil are provided. A bypass path provided with a pump is provided therebetween.

(Operation) According to the first and second aspects of the present invention, in the summer season, the taken-in outside air is cooled by the upstream preheating coil, humidified and washed by the air washer, and then downstream. It is cooled and dehumidified by the cooling and dehumidifying coil on the side.

On the other hand, from the middle season to the winter season, the taken in outside air is preheated by the upstream preheating coil with the cold collected by the downstream cooling and dehumidifying coil, and then humidified and washed by the air washer. The cooling and dehumidification coil on the downstream side cools and dehumidifies. In the invention according to claim 3,
If the supply of cold water from the heat source stops due to a power outage, etc.,
The pump provided with the bypass is activated to prevent the preheating coil and the cooling and dehumidifying coil from freezing.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments shown in the drawings. FIGS. 1 to 3 show an embodiment of an air conditioner according to the first and second aspects of the present invention. FIG. 1 shows an air conditioner 30 that performs outside air processing for clean room air conditioning according to the present embodiment.

In a casing 31 having an air inlet 31a and an air outlet 31b, a pre-filter 32, a medium-performance filter 33, a preheating coil 34, an eliminator 35, and the like are arranged from the air inlet 31a to the air outlet 31b. A water sprayer 36, an eliminator 37, a cooling and dehumidifying coil 38, and a fan 39 are arranged in this order. And the water sprayer 36
A tank 40 is arranged at the lower part of the tank, and the water in the tank 40 can be circulated and used by a pump 41. Further, a heat exchanger 43 is interposed in the pipe 42 provided with the pump 41 so as to supply necessary heat energy to water. The heat exchanger 43 is connected to a heat source via a pipe 43 so that hot water can be supplied.

Here, an air washer 44 is formed by the water sprayer 36, the tank 40, the pump 41, the pipe 42, and the heat exchanger 43. Further, the cold water inlet 34a of the preheating coil 34 and the cold water outlet 38b of the cooling and dehumidifying coil 38
Are connected via a pipe 45.

Further, the cold water inlet 38a of the cooling and dehumidifying coil 38 is connected to a heat source (refrigerator) via a cold water introducing pipe 47 so that cold water can be supplied. The cold water outlet 34b of the preheating coil 34 is connected to a heat source (refrigerator) via a cold water outlet pipe 48 so that the cold water can be returned to the heat source (refrigerator). In this way, the preheating coil 34 and the cooling and dehumidifying coil 38 form a run-around circuit 46.

Next, the operation of the present embodiment will be described. According to the air conditioner 30 according to the present embodiment, in summer,
When outside air is taken in from the air introduction part 31a, foreign substances such as dust and dust are removed by the pre-filter 32 and the medium-performance filter 33, and then cooled by the preheating coil 34 of the run-around circuit 46. For example, as shown in FIG.
Is cooled to a temperature of 16 ° C. and a humidity of 95% by cold water (temperature: 13 ° C. to 15 ° C.).

Here, the run-around circuit 46
The cold water supplied from the heat source is introduced into the cooling and dehumidifying coil 38 from the cold water inlet 34 a of the cooling and dehumidifying coil 38, and cools and dehumidifies the humidified and cleaned air coming out of the air washer 44, and then cools down. From the outlet 34b of the cold water of the wet coil 38 through the pipe 45, the inlet 34a of the cold water of the preheating coil 34
After cooling the outside air introduced into the preheating coil 34 from which impurities such as dust and dirt have been removed by the pre-filter 32 and the medium-performance filter 33, the cold water outlet 3 of the preheating coil 34
4b is returned to the heat source (refrigerator) via the cold water introduction pipe 48.

Preheating coil 34 of run-around circuit 46
The outside air cooled by this is sent out to the air washer 44 via the eliminator 35, and the taken-in outside air is sprayed with, for example, circulating water at 15 ° C. For example, as shown in FIG.
It is cooled and humidified to a humidity of 100%.

Thereafter, the cooled and humidified air flows into the cooling and dehumidifying coil 38 via the eliminator 37. Since cooling water of, for example, 7 ° C. is supplied from the refrigerator to the cooling and dehumidifying coil 38, the air is cooled and dehumidified to a temperature of 11 ° C. and a humidity of 95% in the cooling and dehumidifying coil 38. afterwards,
Air temperature is 11.5 ° C and humidity is 90% by fan 39
Supplied to the clean room.

On the other hand, from the middle season to the winter season, when outside air is taken in from the air introduction part 31a, the pre-filter 3
After removing impurities such as dust and dirt by the second and medium performance filters 33, return water at a temperature of 13 ° C. to 15 ° C. by the preheating coil 34 (sent from the cooling and dehumidification coil 38 via the pipe 45). The returned water is cooled to about 7 ° C. supplied to the cooling and dehumidifying coil 38. In this process, for example, as shown in FIG.
0% of the outside air is heated to a temperature of 5 ° C. and a humidity of 18%.

Thereafter, the heated air is sent out to the air washer 44 via the eliminator 35, and the taken-in outside air is sprayed with, for example, 20 ° C. hot water, and the temperature of 15 ° C.
It is humidified and washed to a humidity of 85%. Thereafter, the humidified and cleaned air is passed through the eliminator 37 to the cooling and dehumidifying coil 38.
Flows into The cooling and dehumidifying coil 38 is supplied with, for example, cold water of 7 ° C. from the refrigerator.
At 8, the air is cooled and dehumidified to a temperature of 11 ° C. and a humidity of 95%.

Thereafter, the air is heated to a temperature of 1 by the fan 39.
It is supplied to a clean room at 1.5 ° C. and 90% humidity. As described above, in the air conditioner 30 according to the present embodiment, the preheating coil 34 is used as a cooling device for the outside air in summer, so that the operation is not stopped in summer as in the conventional preheating coil 4.

Further, in winter, since the preheating coil 34 is used as a device for preheating the outside air, the operation ratio of the refrigerator can be reduced. That is, unlike the conventional preheating coil 4, the preheating coil 34 can cool the outside air in summer and warm the outside air in winter. Further, the cooling and dehumidifying coil 38 is provided with an air conditioner B incorporating the conventional run-around sensible heat exchanger 23.
The functions of the cooling and dehumidifying coils 8 and 19 can be combined.

That is, it is possible to replace the two cooling and dehumidifying coils 8 and 19 required conventionally with one cooling and dehumidifying coil 38. As described above, according to the present embodiment, there is no device that stops all year round, unlike the conventional air conditioner. FIG. 4 shows an embodiment of the air conditioner according to the third aspect of the present invention.

In this embodiment, the pump 50 is connected between the cold water outlet pipe 48 communicating with the cold water outlet 34b of the preheating coil 34 and the cold water introducing pipe 47 communicating with the cold water inlet 38a of the cooling and dehumidifying coil 38. A bypass 49 is provided, and the other configuration is the same as that of the air conditioner 30 shown in FIG. The pump 50 communicates with the emergency power supply circuit, and is configured to start up when a power failure occurs.

A check valve 51 is provided in the cold water introduction pipe 47 and the bypass 49. In the present embodiment, when the supply of cold water from the heat source is stopped due to a power outage or the like, the pump 50 provided in the bypass 49 is started to circulate the cold water between the preheating coil 34 and the cooling and dehumidifying coil 38. , The freezing in the preheating coil 34 and the cooling and dehumidifying coil 38 can be prevented.

[0036]

As described above, claims 1 and 2 are as described above.
According to the described invention, the conventional run-around type sensible heat exchanger is provided because the cooling and dehumidifying coil, which is provided before and after with the air washer interposed therebetween, is cooled by exchanging heat with the outside air for cooling water and dehumidification water of the cooling and dehumidifying coil. Unlike the built-in air conditioner, it does not depend on the outside air temperature and enables energy saving.

Further, in winter and the middle period when the return temperature of the cold water supplied to the cooling and dehumidifying coil is lower than 13 ° C. to 15 ° C., the outside air is cooled by the preheating coil to minimize the operation cost of the refrigerator. be able to. According to the third aspect of the present invention, in addition to the above-described effects, when the supply of cold water from the heat source is stopped due to a power failure or the like, the pump provided in the bypass path is started to supply the cold water to the preheating coil and the cooling dehumidifying coil. The preheating coil and the cooling and dehumidifying coil can be prevented from freezing.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of an air conditioner according to the first and second aspects of the present invention.

FIG. 2 is an explanatory diagram showing a summer operation state of the air conditioner of FIG. 1;

FIG. 3 is an explanatory diagram showing a winter operation state of the air conditioner of FIG. 1;

FIG. 4 is an explanatory view showing an embodiment of an air conditioner according to the third aspect of the present invention.

FIG. 5 is an explanatory diagram showing an air conditioner according to an earlier application.

FIG. 6 is an explanatory diagram showing a summer operation state of the air conditioner of FIG. 5;

FIG. 7 is an explanatory diagram showing a winter operation state of the air conditioner of FIG. 5;

FIG. 8 is an explanatory diagram showing an air conditioner incorporating a run-around sensible heat exchanger.

FIG. 9 is an explanatory diagram showing a summer operation state of the air conditioner of FIG. 8;

FIG. 10 is an explanatory diagram showing a winter operation state of the air conditioner of FIG. 8;

[Explanation of symbols]

 Reference Signs List 30 air conditioner 31 casing 31a air inlet 31b air outlet 34 preheating coil 34a inlet of cold water of preheating coil 34b outlet of cold water of preheating coil 34 38 cooling dehumidification coil 38a inlet of cold water of cooling dehumidification coil 38 38b cooling reduction Outlet of cold water of wet coil 38 39 Fan 44 Air washer 45 Piping 46 Run-around circuit 47 Cold water inlet pipe 48 Cold water outlet pipe 49 Bypass path 50 Pump

Claims (3)

[Claims] In a casing provided with an air washer,
A preheating coil is arranged upstream of the air washer, and a cooling and dehumidifying coil is arranged on the downstream side. Between the preheating coil and the cooling and dehumidifying coil, chilled water from a heat source is preheated from the outlet of the downstream cooling and dehumidifying coil to the upstream. An air conditioner characterized by providing a pipe for supplying to an inlet of a coil. 2. A preheating coil, an air washer, and a cooling and dehumidifying coil are arranged in a casing provided with an air inlet and an air outlet from the air inlet to the air outlet. A pipe for supplying cold water from the heat source from the outlet of the cooling and dehumidifying coil to the inlet of the preheating coil is provided between the cooling dehumidifying coil and the cooling and dehumidifying coil. An air conditioner comprising a pipe for introducing cold water from a heat source. 3. The air conditioner according to claim 1, wherein a pump is provided between the cold water outlet pipe communicating with the outlet of the preheating coil and the cold water introducing pipe communicating with the inlet of the cooling and dehumidifying coil. An air conditioner comprising a bypass path provided.