KR101767521B1

KR101767521B1 - Eco-friendly 100% outdoor air conditioning system and air conditioning method based on dew point indirect evaporative cooler

Info

Publication number: KR101767521B1
Application number: KR1020150179514A
Authority: KR
Inventors: 정재원; 함상우
Original assignee: 한양대학교 산학협력단
Priority date: 2015-12-15
Filing date: 2015-12-15
Publication date: 2017-08-11
Also published as: KR20170071317A

Abstract

The present invention relates to an environment-friendly outdoor air conditioning system, which comprises a piping module for guiding outside air, air supply, indoor air, and exhaust, an total heat exchanger for dehumidifying and cooling the outside air introduced through the piping module, A dew point evaporation cooler for discharging the coarse air with sensible heat to the supply air, and an internal space for introducing the supply air through the dew point evaporation cooler and discharging the internal air to the piping module for the exhaust. Therefore, it is possible to always provide a pleasant indoor environment even under any operating condition.

Description

TECHNICAL FIELD [0001] The present invention relates to an air-conditioning outdoor air conditioning system and an outdoor air-conditioning system using a dew point evaporation cooler,

The present invention relates to an eco-friendly outdoor air conditioning system and an outdoor air conditioning method, and more particularly, to an eco-friendly outdoor air conditioning system and an outdoor air conditioning method using a dew point evaporation cooler.

Nowadays, the earth is suffering from the gaseous greenhouse gas, and now the state is going to solve it.

In December 2007, at the 13th Conference of the Parties to the United Nations Framework Convention on Climate Change, there was a discussion on the response to climate change, and adopted the so-called Bali Roadmap. Korea, which is the world 's 9th largest producer of GHGs, has set a national GHG reduction target in 2009 and is in a position to enter into actual reduction from 2013.

As a result, we are making efforts to develop and commercialize technologies to reduce energy consumption and carbon emissions in almost all industries. In particular, the energy consumption of building ventilation and heating and cooling accounts for more than 30% of total energy consumption.

In recent years, advanced countries in North America and Europe have actively carried out research on pollution free cooling systems that can only be cooled by using only the latent heat of water evaporation. In Korea, too, environmentally friendly cooling system There is a growing interest in.

Water evaporation The latent heat cooling system has been regarded as a system that can only be used in Europe, where temperatures are high in summer, but relatively low in humidity, or in dry climates. However, if indirect evaporative cooling (indirect evaporative cooling), which does not directly contact the air to be supplied for evaporative cooling, is used, it is possible to obtain an economical cooling effect even in a hot and humid climate region such as summer in Korea Cooling system using evaporative cooling has attracted attention.

In addition, when combined with a dehumidification rotor, it is possible to achieve better cooling effect, reduce carbon emission through energy consumption reduction, and excellent environment-friendly characteristics that use water that does not cause environmental destruction unlike existing refrigerants. The research and development on the cooling system using the air conditioner will gain more strength in the future.

However, the evaporative cooling system developed through the previous studies is mostly determined when the supply air temperature is in the range of 23 to 26 ° C in summer, and it is difficult to expect a sufficient cooling effect in a general building unless the supply amount is very large. Because of these limitations, it is necessary to use only the minimum ventilation required to maintain a pleasant air quality in the room, to be used for the outside of the room where the room temperature is near neutral temperature, It is all that is used for the air conditioner.

In order to improve indoor air quality, research on 100% outdoor air system, which controls the indoor environment with only 100% outdoor air, has been actively carried out in developed countries. This phenomenon has been accompanied by serious air-related problems such as sick building syndrome and cross contamination, which occurred when more than 70% of the polluted indoor air was recirculated to the room for energy conservation in existing air conditioning systems Because.

The expectation for the exterior air conditioning system is getting bigger in that it is a technology that exhausts the polluted room air to all outside and cooperates with fresh air only to ensure a pleasant and healthy indoor air quality. However, since the proposed evaporative cooling system is based on the recirculation of the indoor air as in the existing air conditioning system, there is a fundamental problem that it is difficult to expect the indoor air environment to be greatly improved.

Therefore, efforts to combine these two systems are underway, and an eco-friendly outdoor air conditioning system and an outdoor air conditioning system using a dew point evaporation cooler, which will be described in the following description, will be part of this effort.

(Document 1) Korean Publication No. 10-2011-0109209 (June 10, 2011) (Document 2) Korean Publication No. 10-2011-0109204 (June 10, 2011)

It is an object of the present invention to provide an environmentally friendly outdoor air conditioning system using a dew point evaporation cooler.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

According to an aspect of the present invention, there is provided a piping module for guiding outside air, air supply, indoor air, and exhaust air. An exhaust heat exchanger for dehumidifying and cooling the outside air introduced through the piping module; A dew point evaporation cooler for sensing the heat of the air passing through the total enthalpy heat exchanger and discharging it to the supply air; And an inner space for introducing the supply air through the dew point evaporation cooler and discharging the inner air to the piping module for the exhaust.

In the present invention, it is preferable to further include a liquid type dehumidifier for further dehumidifying the air passing through the total enthalpy heat exchanger.

An air supply fan connected to the piping module for guiding the supply air discharged from the dew point evaporation cooler to the inner space; And an exhaust fan connected to the piping module for guiding the indoor air discharged from the internal space to the exhaust.

In the present invention, it is preferable that the dew point evaporation cooler introduces the outside air into a dry channel, discharges the air to the air supply channel, and introduces the indoor air into a wet channel to discharge the air.

In the present invention, it is preferable that the dew point evaporation cooler introduces the outside air into a dry channel, discharges the air to the air supply channel, and introduces the outside air into a wet channel to discharge the air.

In the present invention, it is preferable that the dew point evaporation cooler is configured to introduce the outside air into the first dry channel and discharge it to the air supply, and introduce the indoor air into the second dry channel and the wet channel to discharge the air.

In the present invention, it is preferable to further include a dehumidifying feeder for supplying a dehumidified aqueous solution to the liquid type dehumidifier.

According to another aspect of the present invention, there is provided an outdoor air conditioning method for an environment-friendly outdoor air conditioning system including a piping module, an overall heat exchanger, and a dew point evaporation cooler, Dehumidifying and cooling the outside air including the humidity; Cooling the air that has undergone the dehumidification and cooling steps by means of sensible heat cooling using the dew point evaporation cooler and discharging the air through an air supply; And a step of air conditioning the air supply unit in an internal space.

In the present invention, it is preferable to operate to perform the dehumidifying and cooling using a part of the air supply discharged from the dew point evaporation cooler.

In the present invention, it is preferable to further include a step of humidifying and heating the outside air including the second temperature and humidity, instead of the dehumidifying and cooling step.

In the present invention, it is preferable that the step of cooling the sensible heat and discharging it to the supply air is performed so that the sensible heat is cooled through the water injection operation of the wet channel of the dew point evaporator and the evaporative cooling operation.

In the present invention, it is preferable that the step of exchanging sensible heat with air through the dew point evaporation cooler to the air having passed through the humidifying and heating step, It is preferable that the water injection operation of the channel is stopped and the sensible heat exchange is performed.

The eco-friendly outdoor air conditioning system and the outdoor air conditioning method using the dew point evaporation cooler according to the present invention provide the following effects.

The present invention realizes a pleasant indoor environment regardless of any operating conditions by implementing the outdoor air conditioning system which does not use the refrigerant.

In addition, the present invention can be expected to improve health and work efficiency of residents by eliminating various air quality problems, real or cross-contamination problems caused by recirculation of contaminated indoor air.

In addition, the present invention has an effect of being used for indoor heating in the winter season as well as indoor air conditioning in the summer season and the middle season.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a block diagram illustrating an environment-friendly outdoor air conditioning system according to a first embodiment of the present invention.
FIG. 2 is a view illustrating an environment-friendly outdoor air conditioning system according to a second embodiment of the present invention; FIG.
FIG. 3 is a schematic view illustrating an environment-friendly outdoor air conditioning system according to a third embodiment of the present invention; FIG.
4 is a view for explaining the operation and design type of the dew point evaporation cooler according to the embodiment of the present invention.
FIG. 5 is a diagram showing a humidifier diagram for explaining the cooling and dehumidifying process of the type dew point evaporation cooler 30A of FIG. 1 (A) and the type dew point evaporation cooler 30B of FIG. 2 (B)

The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It is to be understood that the singular " include " or "have" are to be construed as including the stated feature, number, step, operation, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present application.

1 is a block diagram illustrating an environment-friendly outdoor air conditioning system according to a first embodiment of the present invention.

Referring to FIG. 1, the environmentally friendly outdoor air conditioning system includes an total enthalpy heat exchanger 10A, a liquid type dehumidifier 20A, a dew point evaporation cooler 30A, an internal space 40A, and a dehumidifier 50A.

First, the environment-friendly outdoor air conditioning system includes a piping module for guiding the outside air OA, the air supply air SA, the indoor air RA, and the exhaust EA.

The total enthalpy heat exchanger 10A dehumidifies and cools the outside air OA by exchanging heat between the exhaust EA discharged from the room and the outside air OA supplied from the outside through the exhaust fan 1A. For example, the total enthalpy heat exchanger 10A may be a rotary enthalpy wheel or a membrane enthalpy exchanger.

The liquid type dehumidifier 20A dehumidifies the outside air OA through the total enthalpy heat exchanger 10A in accordance with a predetermined humidity by using a liquid type dehumidifying aqueous solution. For example, the liquid type dehumidifier 20A may be a packed bed tower type or an internally cooled dehumidifier type. In addition, an active desiccant wheel may be applied.

The dew point evaporation cooler 30A sensibly cools the air having passed through the liquid type dehumidifier 20A and discharges it to the air supply unit SA. The dew point evaporation cooler 30A can also cool the sensible heat by receiving air discharged from the total enthalpy heat exchanger 10A. The supply air SA discharged from the dew point evaporation cooler 30A is introduced into the internal space 40A through the air supply fan 2A.

The internal space 40A is a space in which the occupants reside, receives the air supply (SA), and discharges the air into the room air RA. The exhausted indoor air RA is discharged to the total enthalpy heat exchanger 10A through the exhaust fan 1A.

The dehumidifying feeder 50A is for supplying a dehumidifying aqueous solution to the liquid type dehumidifier 20A and includes a heat exchanger 51, a heating coil 52, a boiler 53, a regenerator 54, a cooling water coil 55, And a cooling tower (56).

The heat exchanger (51) cools the dehumidified aqueous solution discharged from the liquid type dehumidifier (20A) and the dehumidified aqueous solution discharged from the regenerator (54) by sensible heat exchange.

The heating coil 52 heats the dehumidifying aqueous solution discharged from the heat exchanger 51 and the heating coil 52 can receive a heat source through a boiler 53, for example.

The regenerator 54 passes the outside air OA through the dehumidifying aqueous solution heated by the heating coil 52 to remove moisture. Through this operation, the dehumidifying aqueous solution can be dehumidified in the liquid type dehumidifier 20A.

The dehumidified aqueous solution discharged from the regenerator 54 is again subjected to sensible heat in the heat exchanger 51 and the cooling water coil 55 cools the dehumidified aqueous solution discharged from the heat exchanger 51. The cooling water coil 55 is capable of receiving a cold source from the cooling tower 56, for example.

On the other hand, the dew point evaporation cooler 30A of the first embodiment of Fig. 1 can be designed as the type (A) of Fig. 4 is a view for explaining the operation and design type of the dew point evaporation cooler according to the embodiment of the present invention. For reference, 'T' means dry bulb temperature, 'RH' means relative humidity, 'DP' means dew point temperature and 'WB' means wet bulb temperature.

Referring to FIG. 4, the dew point evaporation cooler 30A of the type (A) receives the outside air OA through the dry channel and a part of the supply air supply SA discharged from the dew point evaporation cooler 30A into the wet channel To cool the outside air OA. If the outside air OA is cooler than the room air RA, it is also possible to heat the outside air OA by introducing the room air RA into the wetting channel to heat the outside air OA. The dew point evaporation cooler 30A of the first embodiment can be used in such a simple structure that the outside air OA recovers cold heat compared with room air or waste heat in winter.

Hereinafter, the summer operation and the winter operation of the environment-friendly outdoor air conditioning system according to the first embodiment will be described with reference to FIG. 1 and FIG.

First, during summer operation, the outside air OA is dehumidified and cooled by the total enthalpy heat exchanger 10A, and further dehumidified by the liquid dehumidifier 20A. Then, the dew point evaporation cooler 30A sensibly cools the air passing through the liquid type dehumidifier 20A. At this time, a part of the supply air (SA) is evaporatively cooled in the wet channel of the dew point evaporative cooler (30A) and discharged to the exhaust (EA) through which the outside air (OA) is sensibly cooled. The remaining supply air SA is introduced into the internal space 40A and the room air RA discharged from the internal space 40A is discharged to the outside air OA through the exhaust fan 1A.

Next, during winter operation, the outside air OA is humidified and heated by the total enthalpy heat exchanger 10A. At this time, it is preferable that the liquid type dehumidifier 20A stops operating. Then, the dew point evaporation cooler 30A receives the room air RA through a piping module indicated by a dashed line, and heats the supply air SA by sensible heat exchange. At this time, it is preferable that no water is sprayed to the wet channel of the dew point evaporative cooler 30A. The supply air SA that has undergone the heat exchange twice in the dew point evaporation cooler 30A is supplied to the indoor space 40A as it is and used as a ventilation supply or may be supplied after heating to be used for heating purposes.

2 is a block diagram illustrating an environment-friendly outdoor air conditioning system according to a second embodiment of the present invention.

2, the environmentally friendly outdoor air conditioning system includes an total enthalpy heat exchanger 10B, a liquid type dehumidifier 20B, a dew point evaporation cooler 30B, an internal space 40B, and a dehumidifier 50B.

In the case of the second embodiment of FIG. 2, only the type of the dew point evaporation cooler 30B is changed as compared with the first embodiment of FIG. The dew point evaporation cooler 30B of the second embodiment of Fig. 2 may be designed as type (B) of Fig.

Referring to FIG. 4, a dew point evaporation cooler 30B of type (B) introduces the outside air OA of a cooled dry channel to a part of a wet channel to cool the outside air OA. The dew point evaporation cooler 30B of the second embodiment is capable of increasing the cooling efficiency through this structure.

In more detail, the outside air can be cooled to the air supply (SA) wet bulb temperature (15.3 ° C) since the outside air OA is cooled and then the discharged air supply SA is introduced into the wet channel.

Hereinafter, the operation of the environment-friendly outdoor air conditioning system according to the second embodiment will be described with reference to FIG. 2 and FIG.

First, during summer operation, the outside air OA is dehumidified and cooled by the total enthalpy heat exchanger 10B, and further dehumidified by the liquid dehumidifier 20B. Then, the dew point evaporation cooler 30B sensibly cools the air passing through the liquid type dehumidifier 20B. At this time, a part of the supply air (SA) is evaporatively cooled in the wet channel of the dew point evaporation cooler (30B) and discharged to the exhaust (EA), whereby the ambient air (OA) is sensibly cooled. The remaining supply air SA is introduced into the internal space 40B and the room air RA discharged from the internal space 40B is discharged to the outside air OA through the exhaust fan 1B.

Next, during winter operation, the outside air OA is humidified and heated by the total enthalpy heat exchanger 10B. At this time, it is preferable that the liquid type dehumidifier 20B and the dew point evaporation cooler 30B are stopped. The supply air SA once subjected to heat exchange in the dew point evaporation cooler 30B may be supplied to the indoor space 40B as it is or heated and used for ventilation supply or for heating after additional heating.

On the other hand, in the case of the dew point evaporation cooler 30B of the type (B) of the second embodiment, since it is a counterflow type as compared with the dew point evaporation cooler 30A of the type (A) of the first embodiment, .

5 is a diagram illustrating a cooling and dehumidifying process of the type dew point evaporation cooler 30A of FIG. 1 (A) and the type dew point evaporation cooler 30B of FIG. 2 (B).

Referring to FIGS. 2 and 5, the outside air OA passes through the total enthalpy heat exchanger 10B and the temperature and humidity are lowered. Thereafter, the temperature and the humidity become lower while passing through the liquid type dehumidifier 20B. When the dew point evaporator 30B is passed through the dew point evaporator 30B, low temperature and low humidity can be formed in the supply air SA.

3 is a block diagram illustrating an environment-friendly outdoor air conditioning system according to a third embodiment of the present invention.

3, the environment-friendly outdoor air conditioning system includes an enthalpy heat exchanger 10C, a liquid type dehumidifier 20C, a dew point evaporation cooler 30C, an internal space 40C, and a dehumidifier 50C.

In the case of the third embodiment of FIG. 3, only the type of the dew point evaporative cooler 30C is changed as compared with the first embodiment of FIG. The dew point evaporation cooler 30C of the third embodiment of Fig. 3 may be designed as the type (C) of Fig.

Referring to FIG. 4, a dew point evaporation cooler 30C of type (C) introduces outside air OA and room air RA into separate first and second dry channels, respectively. Thus, the exhaust EA that has passed through the second dry channel is introduced into the wet channel to be evaporated and cooled, discharged to the exhaust EA, and the outside air OA is introduced into the first dry channel to cool the outside air OA do.

At this time, the room air RA is introduced into the wet channel while talking on the second dry channel, and indirectly evaporated and cooled in the air evaporatively cooled. The first cooled room air (RA) is introduced into the wet channel and evaporated and cooled, thereby achieving the second cooling.

Also, the outside air OA introduced into the first dry channel is indirectly evaporated and cooled by the air introduced into the wet channel and evaporatively cooled, similarly to the indoor air RA introduced into the second dry channel. Here, the air introduced into the wet channel and evaporatively cooled is, as described above, since it is the second cooled exhaust, it is possible to cool the outside air OA of the first dry channel more strongly.

The dew point evaporative cooler 30C of the third embodiment is capable of increasing energy efficiency through this structure.

More specifically, the indoor air (RA) and the outside air (OA) are introduced into the respective dry channels, and sensible heat is cooled by the indirect evaporative cooling method. Here, when the indoor air RA cooled in the dry channel is introduced into the wetting channel, the air RA2 introduced into the wetting channel is cooled down to 18 占 폚 and the wetting temperature of the air RA2 introduced into the wetting channel is 16.3 Lt; 0 > C, it is possible to cool the supply air (SA).

Hereinafter, the operation of the environment-friendly outdoor air conditioning system according to the second embodiment will be described with reference to FIG. 3 and FIG.

At the start of summer, the outside air OA is dehumidified and cooled by the total enthalpy heat exchanger 10B and further dehumidified by the liquid dehumidifier 20C. Then, the dew point evaporation cooler 30C sensibly cools the air passing through the liquid type dehumidifier 20C. At this time, a part of the room air RA is evaporated and cooled in the wet channel of the dew point evaporation cooler 30A and is discharged to the exhaust EA, whereby the outside air OA is sensibly cooled. The remaining supply air SA is introduced into the internal space 40A and the room air RA discharged from the internal space 40A is discharged to the outside air OA through the exhaust fan 1A.

Next, during winter operation, the outside air OA is humidified and heated by the total enthalpy heat exchanger 10C. At this time, it is preferable to stop the operation of the liquid type dehumidifier 20B. Then, the dew point evaporation cooler 30C sends the room air RA to the wet channel through the piping module indicated by the dashed line and heats the supply air (SA) by sensible heat exchange. At this time, it is preferable that no water is sprayed on the wet channel of the dew point evaporative cooler 30C. The supply air SA which has undergone the heat exchange twice in the dew point evaporation cooler 30A is supplied to the indoor space 40C as it is and used as a ventilation supply or supplied after heating to be used for heating purpose.

In the environment-friendly outdoor air conditioning system according to the embodiment of the present invention, it is possible to cool the outside air (OA) by using a dew point evaporation cooler. In such a dew point evaporation cooler, the maximum coolable temperature is the dew point temperature of the dry channel inlet air, which makes it possible to ensure an air supply (SA) of 11 ° C to 15 ° C.

In addition, the environment-friendly outdoor air conditioning system according to the embodiment of the present invention can utilize the indoor air RA by using the dew point evaporation cooler. Particularly, the room air RA can be used in the total heat exchanger, and it is possible to reduce the dehumidifying load by cooling the outside air OA and humidifying the outside air OA.

In the first to third embodiments of the present invention, the dew point evaporative cooler may be a Dew point evaporative heat exchanger type or a Dew point indirect evaporative cooler type.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not for purposes of limiting the technical idea of the present invention, but rather are not intended to limit the scope of the technical idea of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10A: total heat exchanger 20A: liquid type dehumidifier
30A: Dew point evaporation cooler 40A: Inner space
50A: Dehumidifying feeder

Claims

A piping module for guiding outdoor air, air supply, indoor air, and exhaust;
An exhaust heat exchanger for dehumidifying and cooling the outside air introduced through the piping module;
A liquid type dehumidifier for dehumidifying air passing through the total enthalpy heat exchanger;
A dew point evaporation cooler having a structure for introducing a part of the discharged air supply into the wetting channel and for discharging the air passed through the liquid type dehumidifier to the air supply by sensible heat exchange; And
An inner space for introducing the supply air through the dew point evaporation cooler and discharging the inner air to the piping module for the exhaust,
And cooling and heating are controlled in accordance with driving operations of the liquid type dehumidifier and the dew point evaporation cooler, respectively
Environmentally friendly outdoor air conditioning system.

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The method according to claim 1,
An air supply fan connected to the piping module for guiding the supply air discharged from the dew point evaporation cooler to the inner space; And
And an exhaust fan connected to the piping module for guiding the indoor air discharged from the internal space to the exhaust
Environmentally friendly outdoor air conditioning system.

The method according to claim 1,
The dew point evaporation cooler introduces the outside air into a dry channel and discharges the room air to the air supply unit.
Environmentally friendly outdoor air conditioning system.

The method according to claim 1,
The dew point evaporation cooler introduces the outside air into a dry channel, discharges the air to the air supply channel, introduces the outside air into a wet channel, and discharges the air into the exhaust channel
Environmentally friendly outdoor air conditioning system.

The method according to claim 1,
The dew point evaporation cooler introduces the outside air into a first dry channel and discharges the air to an air supply unit, and introduces the indoor air into a second dry channel and a wetting channel,
Environmentally friendly outdoor air conditioning system.

The method according to claim 1,
Further comprising a dehumidifying feeder for supplying a dehumidifying aqueous solution to the liquid type dehumidifier
Environmentally friendly outdoor air conditioning system.

The method according to claim 1,
Wherein the outdoor air is dehumidified and cooled by the total enthalpy heat exchanger during summer operation, further dehumidified by the liquid dehumidifier, and sensibly cooled by the dew point evaporation cooler,
The operation of the liquid type dehumidifier is stopped at the time of winter operation, the outside air is humidified and heated in the total enthalpy heat exchanger, and the wet channel water spraying of the dew point evaporation cooler is restricted so that the supply air is sensibly heated
Environmentally friendly outdoor air conditioning system.

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