KR101990591B1 - Indirect evaporative cooling apparatus - Google Patents

Abstract

The present invention relates to an indirect evaporative cooling device, and more particularly, to an indirect evaporative cooling device that improves the cooling efficiency by using a dehumidifying part provided with a membrane.
The present invention provides an indirect evaporative cooling apparatus that uses dehumidified air of a dehumidifying unit provided with a membrane and selectively uses the outside air and the cooling air discharged into the room, thereby achieving high cooling efficiency with low power consumption.

Description

[0001] INDIRECT EVAPORATIVE COOLING APPARATUS [0002]

The present invention relates to an indirect evaporative cooling device, and more particularly, to an indirect evaporative cooling device that improves the cooling efficiency by using a dehumidifying part provided with a membrane.

In recent years, we have been working to develop and commercialize energy saving and carbon emission reduction technologies in almost all industries. Especially, in the building sector, which accounts for more than 30% of the total energy consumption in Korea, we will reduce the energy consumed by ventilation and heating and cooling to develop a high-efficiency and high-performance system that can drastically reduce GHG emissions in the building sector. We are working hard.

As a part of this, various advanced countries in North America and Europe actively carry out researches on pollution free cooling system that uses only the latent heat of evaporation of water to supply cooling air. Therefore, Korea has recently been promoting environmental conservation and energy conservation There is a growing interest in pursuing eco-friendly cooling systems.

Evaporation of water The cooling system using latent heat has been regarded as a system that can only be used in a European or dry climate region where the temperature of the summer is high but the humidity is relatively low. However, the indirect evaporative cooling method in which the outside air is not in direct contact with the water sprayed for evaporative cooling can provide an economical cooling effect even in a hot and humid climate region such as Korea in the summer As the facts become known, a cooling system using evaporative cooling has attracted attention.

In addition, when a dehumidifying rotor is additionally coupled to a cooling system using indirect evaporative cooling, it is possible to further improve cooling efficiency, reduce carbon emissions by reducing energy consumption, and prevent water pollution Due to its environmentally friendly characteristics, the research and development on cooling system using latent heat of evaporation will gain more strength in the future.

Therefore, research and development are needed to improve the cooling efficiency of the cooling system using indirect evaporative cooling.

Korean Registered Patent No. 10-1712741 (Registered on July 27, 2017, entitled Indirect Evaporative Cooling Apparatus and Method)

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems of the prior art, and it is an object of the present invention to provide a dehumidifying apparatus, which uses dehumidifying air of a dehumidifying portion provided with a membrane, and selectively uses the outside air and the cooling air discharged into the room, And to provide an indirect evaporative cooling apparatus capable of obtaining efficiency.

According to an aspect of the present invention, there is provided an indirect evaporative cooling apparatus comprising: an external air flow path through which external air flows; A membrane that is connected to a vacuum pump to pass moisture of the outside air introduced from the outside air passage so as to reduce the relative humidity of the outside air to form dehumidifying air; A dehumidifier having a porous material for amplifying a difference in moisture concentration between an upper surface and a lower surface; An indirect evaporation cooling unit for introducing the dehumidifying air from the dehumidifying unit and reducing the dry bulb temperature of the dehumidifying air using the latent heat of evaporation of water supplied from the outside to form cooling air; A cooling air passage connected to the indirect evaporation cooling section for discharging the cooling air formed in the indirect evaporation cooling section to the room; Off control of a water supply pump for supplying water to the indirect evaporative cooling unit or for controlling the on / off of the external air branched from the external air flow path by the indirect evaporative cooling And a control unit for selectively opening and closing a second branch flow path for supplying the first branch flow path to the indirect evaporation cooling unit and the cooling air branched from the cooling air flow path to the indirect evaporation cooling unit.

In addition, in the indirect evaporative cooling apparatus according to an embodiment of the present invention, the reference temperature includes a first reference temperature, and a first operation mode in which the first operation mode is operated when the temperature of the external air is lower than the first reference temperature The controller controls the water supply pump to be turned off and controls the first branch passage and the second branch passage to be closed so that water, the outside air or the cooling air is not supplied to the indirect evaporation cooling section .

Also, in the indirect evaporative cooling apparatus according to an embodiment of the present invention, the reference temperature includes a first reference temperature and a second reference temperature higher than the first reference temperature, The control unit controls the water supply pump to be turned on and controls the first branch flow channel to be opened and the second branch flow channel to open the second branch flow channel in the second operation mode, So that the outside air and the water having the first water temperature are supplied to the indirect evaporation cooling section.

In the indirect evaporative cooling apparatus according to an embodiment of the present invention, the reference temperature may be a first reference temperature, a second reference temperature that is higher than the first reference temperature, a third reference temperature that is higher than the second reference temperature, Wherein the controller controls the water supply pump to be turned on in a third operation mode including a temperature and a temperature in which the outside air is between the second reference temperature and the third reference temperature, Cooling air having a first cooling air dry bulb temperature lower than the dry bulb temperature of the outside air and cooling air having a first cooling air draft bulb temperature lower than the first water temperature by controlling the second branch flow channel to be opened, And water having a low second water temperature is supplied.

The indirect evaporation cooling apparatus according to an embodiment of the present invention may further include an evaporation cooler for further cooling the water discharged from the indirect evaporation cooling unit and supplying the cooled water to the water supply pump, A second reference temperature higher than the first reference temperature and a third reference temperature higher than the second reference temperature and is operated when the temperature of the outside air is higher than the third reference temperature In the fourth operation mode, the control unit controls the water supply pump and the evaporative cooler to be turned on, controls the first branch passage to be closed, and controls the second branch passage to be opened, Cooling air having a second cooling air dry bulb temperature lower than the first cooling air dry bulb temperature and water having a third water temperature lower than the second water temperature is supplied .

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The indirect evaporative cooling apparatus according to the present invention has an effect of obtaining high cooling efficiency with low power consumption by selectively using external air and cooling air to perform evaporative cooling in the indirect evaporative cooling unit.

In addition, the indirect evaporative cooling apparatus according to the present invention has an effect of improving the dehumidification efficiency by using a dehumidifying part provided with a membrane.

In addition, the indirect evaporative cooling device according to the present invention has the effect of further improving the dehumidification efficiency by providing the porous material on the lower surface of the membrane.

In addition, the indirect evaporative cooling apparatus according to the present invention has the effect of obtaining the maximum cooling efficiency by the minimum power consumption by controlling the four operation modes in the control unit.

In addition, the indirect evaporative cooling apparatus according to the present invention has an effect of controlling the dry bulb temperature of the cooling air by controlling the evaporation cooling temperature in the indirect evaporative cooling unit by controlling the temperature of the water supplied from the water supply pump.

1 is a schematic view of a structure of an indirect evaporative cooling apparatus according to an embodiment of the present invention.
2 is a schematic view illustrating a structure of a dehumidifying part according to an embodiment of the present invention.
FIG. 3 is a schematic view illustrating an operation process in a first operation mode according to an embodiment of the present invention.
FIG. 4 is a schematic view illustrating an operation process in a second operation mode according to an embodiment of the present invention.
FIG. 5 is a schematic diagram illustrating an operation process in a third operation mode according to an embodiment of the present invention. Referring to FIG.
6 is a diagram schematically illustrating an operation process in a fourth operation mode according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention in which the above-mentioned problems to be solved can be specifically realized will be described with reference to the accompanying drawings. In describing the embodiments, the same names and the same symbols are used for the same configurations, and additional description therefor will be omitted below.

FIG. 1 is a schematic view of a structure of an indirect evaporative cooling apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic view of a structure of a dehumidifying part according to an embodiment of the present invention.

1 and 2, an indirect evaporative cooling apparatus according to an embodiment of the present invention includes an external air passage 100, a dehumidifying unit 200, an indirect evaporative cooling unit 400, A cooling air passage 410, a first branch passage 110, a second branch passage 411, an evaporative cooler 600, and a control unit (not shown).

The outside air flow path (100) flows into the outside air flow.

The dehumidifying part 200 receives the outside air from the outside air passage 100 and reduces the relative humidity of the outside air to form dehumidified air. At this time, the dehumidifying part 200 may be connected to the first vacuum pump line 310 of the vacuum pump 300.

2, the dehumidifying part 200 may be a membrane dehumidifying part 200 for lowering the humidity of the outside air by using a membrane (Membrane 201).

More specifically, the dehumidifying unit 200 does not lower the humidity of the outside air through conventional heat transfer such as conduction, radiation, and convection, but also performs mass transfer such as absorption, extraction, The water molecules in the outside air pass through the membrane 201 in the inner space of the dehumidifying part 200 through the water molecule movement path, and the moisture of the outside air The humidity will be lowered.

That is, the dehumidifying unit 200 is configured to smoothly remove the moisture in the room by using only a method of selectively removing the moisture of the outside air through the membrane 201 through the pressure difference by the vacuum pump 300, The power consumption is greatly reduced as compared with the dehumidifier and the cooling dehumidifier, and the noise generated by driving the dehumidifier can be significantly reduced.

The dehumidifying part 200 accumulates moisture in the membrane 201 when the outside air passes through the membrane 201 through the external air passage 100 and the moisture absorption through the membrane 201 is continued until the accumulated moisture is removed .

For this, the dehumidifying part 200 according to an embodiment of the present invention may further include a porous material 202 disposed on the lower surface of the membrane 201. At this time, the porous material 202 preferably has a hydrophilic property.

 That is, the porous material 202 has an advantage that the dehumidification efficiency of the dehumidifying part 200 can be improved by absorbing the moisture on the lower surface of the membrane 201 and amplifying the difference in moisture concentration between the upper surface and the lower surface of the membrane 201 .

The indirect evaporative cooling unit 400 may be connected to the dehumidifying unit 200 through the dehumidifying air passage 220. The dehumidifying air formed from the dehumidifying unit 200 flows into the dehumidifying air passage 220, The latent heat of vaporization of the water supplied from the pump 500 is used to reduce the dry bulb temperature of the dehumidifying air to form the cooling air.

The water supply pump 500 supplies water to the indirect evaporation cooling unit 400. At this time, the water supply pump 500 and the indirect evaporative cooling unit 400 may be connected through the water supply flow path 510.

That is, when the water supply pump 500 is operated, water is supplied to the indirect evaporation cooling unit 400 through the water supply flow path 510. At this time, water supplied to the indirect evaporation cooling unit 400 is sprayed in the form of mist Can be supplied.

At this time, the indirect evaporation cooling unit 400 and the water supply pump 500 may be connected to the first water circulation channel 420, and water discharged from the indirect evaporation cooling unit 400 may flow into the first water circulation channel 420, To the water supply pump (500).

Meanwhile, the evaporation cooling temperature of the indirect evaporation cooling unit 400 can be adjusted by controlling the temperature of the water supplied from the water supply pump 500.

The cooling air passage 410 is connected to the indirect evaporation cooling unit 400 to discharge the cooling air formed in the indirect evaporation cooling unit 400 to the room.

The first branch passage 110 connects the external air passage 100 with the indirect evaporative cooling section 400 and supplies the external air branched from the external air passage 100 to the indirect evaporative cooling section 400.

More specifically, water adheres to the surface of the indirect evaporative cooling unit 400 while spraying water in the form of mist in the indirect evaporative cooling unit 400. At this time, when the external air supplied to the indirect evaporative cooling unit 400 is supplied through the first branch passage 110, the partial pressure difference between the water sticking to the surface of the indirect evaporative cooling unit 400 and the steam contained in the external air And the surface temperature of the indirect evaporation cooling unit 400 is lowered.

At this time, the dehumidifying air formed in the dehumidifying part 200 passes through the indirect evaporative cooling part 400 and is heat-exchanged with the surface of the indirect evaporative cooling part 400 whose temperature is lowered by latent heat of vaporization, Cooling air having a dry bulb temperature and a wet bulb temperature lower than the wet bulb temperature is formed.

On the other hand, the first branch passage 110 may be opened in a second operation mode in which the operation is performed when the temperature of the outside air described later is between the first reference temperature and the second reference temperature.

That is, the indirect evaporation cooling unit 400 is configured to evaporate and cool the dehumidified air formed in the dehumidifying unit 200, the outside air supplied through the first branch flow path 110 and the water supplied from the water supply pump 500 Thereby forming cooling air suitable for the second operation mode.

 The second branch passage 411 connects the cooling air passage 410 and the indirect evaporative cooling section 400 and supplies the cooling air branched from the cooling air passage 410 to the indirect evaporation cooling section 400 .

The second branch passage 411 has a third operation mode in which the operation is performed when the temperature of the outside air to be described later is between the second reference temperature and the third reference temperature and the fourth operation mode when the temperature is higher than the third reference temperature Mode to the indirect evaporation cooling unit 400. The indirect evaporation cooling unit 400 is provided with a cooling air flow path 410,

That is, the indirect evaporation cooling unit 400 is configured to evaporate and cool the dehumidified air formed in the dehumidifying unit 200, the cooling air supplied through the second branch passage 411, and the water supplied from the water supply pump 500 Thereby forming cooling air suitable for the third operation mode and the fourth operation mode. The difference between the third operation mode and the fourth operation mode that are operated with the cooling air supplied through the second branch passage 411 will be described in detail below.

The evaporative cooler 600 further cools the water discharged from the indirect evaporative cooling unit 400 and supplies the cooled water to the water supply pump 500.

That is, the evaporative cooler 600 can be operated by the control unit to intensely cool the room indoors in the fourth operation mode.

At this time, the indirect evaporation cooling unit 400 and the evaporation cooler 600 may be connected by the second water circulation channel 610, and the evaporation cooler 600 and the water supply pump 500 may be connected to the third water circulation channel 620 ). ≪ / RTI >

The evaporation cooler 600 is connected to the vacuum pump 300 connected to the dehumidifying unit 200 by the second vacuum pump line 630 and is connected to the indirect evaporation cooling unit 400 by the vacuum pressure of the vacuum pump 300. [ Can heat-exchange the discharged water.

The control unit (not shown) controls on / off of the water supply pump 500 and the evaporative cooler 600 to change the operation mode based on a predetermined reference temperature, It is possible to selectively open and close the flow path 411 in the second branch.

At this time, the reference temperature may include a first reference temperature, a second reference temperature higher than the first reference temperature, and a third reference temperature higher than the second reference temperature.

The operation mode includes a first operation mode in which the operation is performed when the temperature of the outside air is lower than the first reference temperature and a second operation mode in which the operation mode is operated when the temperature of the outside air is between the first reference temperature and the second reference temperature, And a fourth operation mode in which the third operation mode is operated when the temperature of the outside air is between the second reference temperature and the third reference temperature and the fourth operation mode when the temperature of the outside air is higher than the third reference temperature.

3 to 6, the respective operation modes controlled through the control unit according to the embodiment of the present invention will be described.

In the drawings, Tdb (dry bulb temp) represents dry bulb temperature, Twb (wet bulb temp) represents wet bulb temperature, RH (relative humidity) represents relative humidity, and Twater represents water temperature.

In the description of each operation mode, it is assumed that the dry air temperature of the outside air is 27 degrees, the wet bulb temperature is 19 degrees, and the relative humidity is 47%.

The configuration shown in Figs. 3 to 6 schematically shows only the configuration necessary for operation in each operation mode.

FIG. 3 is a schematic view illustrating an operation process in a first operation mode according to an embodiment of the present invention. At this time, the dotted arrow indicates a state in which the water supply pump is not operated.

Referring to FIG. 3, the first operation mode is operated when the temperature of the outside air is lower than the first reference temperature.

That is, the first operation mode may be a dehumidification mode in which only the dehumidifying part 200 is operated by operating the dehumidifying air only when the indoor is not hot.

The control unit in the first operation mode controls the water supply pump 500 to be turned off so that the first branch flow path 110 and the second branch flow path 411 are closed so that the indirect evaporation cooling unit 400 is provided with water , No outside air or cooling air is supplied.

More specifically, in the first operation mode, the outside air is first supplied to the dehumidifying part 200 through the outside air passage 100.

At this time, in the dehumidifying part 200, the outside air passes through the membrane 201 and the porous material 202 by the operation of the vacuum pump 300, and moisture is removed to form dehumidified air.

The dry bulb temperature of the dehumidifying air formed through the dehumidifying unit 200 is maintained at 27 degrees, the wet bulb temperature is reduced to 16 degrees, and the relative humidity is reduced to 31%.

The dehumidifying air formed in the dehumidifying part 200 moves to the dehumidifying air passage 220 and is discharged to the room through the cooling air passage 410 via the indirect evaporating and cooling part 400.

As a result, the room is provided with dehumidified air having a dry bulb temperature of 27 degrees, a wet bulb temperature of 16 degrees, and a relative humidity of 31% formed in the dehumidifier 200.

FIG. 4 is a schematic view illustrating an operation process in a second operation mode according to an embodiment of the present invention.

 Referring to FIG. 4, the second operation mode is operated when the temperature of the outside air is between the first reference temperature and the second reference temperature.

That is, the second operation mode may be a cooling mode in which the room is weakly cooled as an operation mode when the interior feels harsh.

The control unit in the second operation mode controls the water supply pump 500 to be turned on so as to control the first branch passage 110 to be opened and the second branch passage 411 to be closed, And the water having the first water temperature and the outside air can be supplied to the second water tank 400.

More specifically, in the second operation mode, first, outside air is supplied to the dehumidifying part 200 through the outside air passage 100.

Dehumidifying air is formed in the dehumidifying part 200 and dehumidified air is supplied to the indirect evaporative cooling part 400 through the dehumidifying air flow path 220.

As described above, the dry bulb temperature of the dehumidifying air formed through the dehumidifying unit 200 is maintained at 27 degrees, the wet bulb temperature is reduced to 16 degrees, and the relative humidity is reduced to 31%.

At the same time, the water having the first water temperature is supplied to the indirect evaporation cooling unit 400 from the water supply pump 500 turned on by the control unit, and the outside air is supplied through the first branch flow channel 110 opened by the control unit Is supplied to the indirect evaporation cooling section (400).

At this time, the second branch passage 411 is closed so that the cooling air is not supplied to the indirect evaporative cooling unit 400 through the control unit.

The dry bulb temperature of the outside air supplied through the first branch passage 110 is 27 degrees same as the temperature of the outside air supplied to the dehumidifier 200, and the wet bulb temperature is 19 degrees.

Next, the indirect evaporation cooling section 400 performs evaporative cooling by the difference in partial pressure between water supplied from the water supply pump 500 and water vapor of the outside air supplied from the first branch flow path 110, The surface temperature of the evaporator 400 is lowered, and the indirect evaporation cooling unit 400, in which the surface temperature is lowered while passing through the humidifier, is evaporated and cooled to form cooling air.

 On the other hand, as the evaporation cooling is performed between the outside air and the water to be sprayed, the water to be injected converges to the wet bulb temperature of the outside air and has the first water temperature of 19 degrees which is the same as the wet bulb temperature of the outside air.

More specifically, when the temperature of the water to be sprayed is lower than the dew point temperature of the outside air, the humidity is cooled. When the temperature of the water to be sprayed is higher than the dew point temperature of the outside air, a part of the water droplets are evaporated and the outside air is cooled and humidified.

At this time, when the air film on the sprayed water surface is saturated air, the temperature of the air film may be the same as the temperature of the water to be sprayed and the humidity is 100%.

Therefore, it can be said that the state of the air film on the surface of the water droplet is the same as the state of the external air flowing around the water droplet, so that the state of equilibrium in which heat and mass transfer do not occur.

The dry bulb temperature of the cooling air formed through the indirect evaporation cooling unit 400 is lowered by 23 degrees and the wet bulb temperature is lowered by 15 degrees.

The cooling air formed in the indirect evaporation cooling unit (400) is discharged to the room through the cooling air flow path (410).

As a result, the dry bulb temperature formed by the indirect evaporation cooling unit 400 in the room is 23 degrees and the wet bulb temperature is 15 degrees.

FIG. 5 is a schematic diagram illustrating an operation process in a third operation mode according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 5, the third operation mode is operated when the temperature of the outside air is between the second reference temperature and the third reference temperature.

That is, the third operation mode may be an operation mode when the interior is more hot than the second operation mode, and may be a cooling mode in which the interior is cooled to a medium degree.

The control unit in the third operation mode controls the water supply pump 500 to be turned on so that the first branch flow path 110 is closed and the second branch flow path 411 is opened, The cooling air having the first cooling air dry bulb temperature lower than the dry bulb temperature of the outside air and the water having the second water temperature lower than the first water temperature can be supplied to the cooling water supply unit 400. [

Hereinafter, the cooling air having the first cooling air dry bulb temperature lower than the dry bulb temperature of the outside air will be referred to as 'first cooling air' for convenience of explanation.

More specifically, in the third operation mode, first, outside air is supplied to the dehumidifying part 200 through the outside air passage 100.

Dehumidifying air is formed in the dehumidifying part 200 and dehumidified air is supplied to the indirect evaporative cooling part 400 through the dehumidifying air flow path 220.

As described above, the dry bulb temperature of the dehumidifying air formed through the dehumidifying unit 200 is maintained at 27 degrees, the wet bulb temperature is reduced to 16 degrees, and the relative humidity is reduced to 31%.

At the same time, water is supplied to the indirect evaporation cooling section 400 from the water supply pump 500 which is turned on by the control section, and the cooling air is supplied to the indirect evaporation cooling section 400 through the second branch flow passage 411 opened by the control section ).

At this time, the first branch passage 110 is closed so that the external air is not supplied to the indirect evaporation cooling section 400 through the control section.

The first cooling air supplied to the indirect evaporation cooling unit 400 through the second branch passage 411 is 21 degrees same as the temperature of the cooling air discharged into the room in the third operation mode and the wet bulb temperature is 13 degrees .

Next, the evaporation cooling is performed by the partial pressure difference between the water supplied from the water supply pump 500 in the indirect evaporation cooling unit 400 and the water vapor of the first cooling air supplied from the second branch flow channel 411, The surface temperature of the cooling unit 400 is lowered, and the indirect evaporation cooling unit 400, in which the surface temperature is lowered while passing through the humidifier, is evaporated and cooled to form cooling air.

 On the other hand, water evaporated and cooled between the first cooling air and the water to be injected converges to the wet bulb temperature of the first cooling air and has the second water temperature which is 13 degrees same as the wet bulb temperature of the first cooling air.

The dry bulb temperature of the first cooling air formed through the indirect evaporation cooling unit 400 is lowered by 21 degrees and the wet bulb temperature is lowered by 13 degrees.

The first cooling air formed in the indirect evaporation cooling unit 400 is discharged to the room through the cooling air flow path 410.

As a result, in the third operation mode, the first dry air having the dry bulb temperature of 21 degrees and the wet bulb temperature of 13 degrees is supplied from the indirect evaporative cooling unit 400 in the room.

6 is a diagram schematically illustrating an operation process in a fourth operation mode according to an embodiment of the present invention.

Referring to FIG. 6, the fourth operation mode is operated when the temperature of the outside air is higher than the third reference temperature.

That is, the fourth operation mode may be a strong cooling mode in which the room is strongly cooled as an operation mode when the room feels very hot.

The control unit in the fourth operation mode controls the water supply pump 500 and the evaporative cooler to be turned on so as to control the first branch passage 110 to be closed and the second branch passage 411 to be opened, The evaporative cooling unit 400 can be supplied with the cooling air having the second cooling air dry bulb temperature lower than the first cooling air dry bulb temperature and the water having the third water temperature lower than the second water temperature.

Hereinafter, for convenience of explanation, 'cooling air having a second cooling air dry bulb temperature lower than the first cooling air dry bulb temperature' will be referred to as 'second cooling air'.

More specifically, in the fourth operation mode, first, outside air is supplied to the dehumidifying part 200 through the outside air flow path.

Dehumidifying air is formed in the dehumidifying part 200 and dehumidified air is supplied to the indirect evaporative cooling part 400 through the dehumidifying air flow path 220.

As described above, the dry bulb temperature of the dehumidifying air formed through the dehumidifying unit 200 is maintained at 27 degrees, the wet bulb temperature is reduced to 16 degrees, and the relative humidity is reduced to 31%.

At the same time, the water is supplied from the water supply pump 500, which is turned on by the control unit, to the indirect evaporation cooling unit 400, and the second cooling air is supplied to the indirect evaporation cooling unit 400 through the second branch flow channel 411 opened by the control unit. (400).

At this time, in order to prevent the external air from being supplied to the indirect evaporative cooling unit 400 through the control unit, the first branch flow channel 110 is closed and the evaporative cooler 600 are turned on.

The second cooling air supplied to the indirect evaporation cooling unit 400 through the second branch flow path 411 has a dry bulb temperature of 20 degrees and a wet bulb temperature equal to the temperature of the cooling air discharged into the room in the fourth operation mode 13 degrees.

At this time, if the temperature of the water supplied from the cooling evaporator to the water supply pump 500 is adjusted to supply the cooling air having the lower dry bulb temperature to the room depending on the degree of hotness of the room, the dry bulb temperature Is lower than 20 degrees, and the wet bulb temperature is also lower than 13 degrees.

Next, the evaporation cooling is performed by the partial pressure difference between the water supplied from the water supply pump 500 and the water vapor of the second cooling air supplied from the second branch flow channel 411 in the indirect evaporation cooling unit 400, The surface temperature of the cooling part 400 is lowered and the second cooling air is formed while evaporating and cooling the indirect evaporation cooling part 400 in which the surface temperature of the cooling part 400 is lowered while passing through the humidifier.

 On the other hand, water evaporated and cooled between the second cooling air and the water to be injected converges to the wet bulb temperature of the second cooling air, so that the third water, which is 13 degrees or 13 degrees lower than the wet bulb temperature of the second cooling air, Temperature.

The dry bulb temperature of the second cooling air formed through the indirect evaporation cooling unit 400 is lowered by 20 degrees and the wet bulb temperature is lowered by 13 degrees.

The second cooling air formed in the indirect evaporation cooling unit 400 is discharged to the room through the cooling air flow path 410.

As a result, in the fourth operation mode, the second dry air having a dry bulb temperature of 20 degrees and a wet bulb temperature of 13 degrees is provided in the indoor indirect evaporative cooling unit 400.

On the other hand, when the temperature of the water supplied from the cooling evaporator to the water supply pump 500 is adjusted to be low according to the degree of the room temperature in the fourth operation mode, the dry bulb temperature in the room is lowered by 20 degrees, The lowered second cooling air is supplied.

INDUSTRIAL APPLICABILITY As described above, the indirect evaporative cooling apparatus according to the present invention has an effect of obtaining high cooling efficiency with low power consumption by selectively using external air and cooling air to perform evaporative cooling in the indirect evaporative cooling unit have.

In addition, the indirect evaporative cooling apparatus according to the present invention has an effect of improving the dehumidification efficiency by using a dehumidifying part provided with a membrane.

In addition, the indirect evaporative cooling device according to the present invention has the effect of further improving the dehumidification efficiency by providing the porous material on the lower surface of the membrane.

In addition, the indirect evaporative cooling apparatus according to the present invention has the effect of obtaining the maximum cooling efficiency by the minimum power consumption by controlling the four operation modes in the control unit.

In addition, the indirect evaporative cooling apparatus according to the present invention has an effect of controlling the dry bulb temperature of the cooling air by controlling the evaporation cooling temperature in the indirect evaporative cooling unit by controlling the temperature of the water supplied from the water supply pump.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Modify or modify the Software.

100: external air flow path 110: first branch flow path
200: dehumidifying part 300: vacuum pump
400: indirect evaporation cooling section 410: cooling air flow path
411: 2nd quarter Euro 500: Water supply pump
600: Evaporative cooler

Claims (6)

An external air passage through which external air flows;
A membrane that is connected to a vacuum pump to pass moisture of the outside air introduced from the outside air passage so as to reduce the relative humidity of the outside air to form dehumidifying air; A dehumidifier having a porous material for amplifying a difference in moisture concentration between an upper surface and a lower surface;
An indirect evaporation cooling unit for introducing the dehumidifying air from the dehumidifying unit and reducing the dry bulb temperature of the dehumidifying air using the latent heat of evaporation of water supplied from the outside to form cooling air;
A cooling air passage connected to the indirect evaporation cooling section for discharging the cooling air formed in the indirect evaporation cooling section to the room; And
Off control of the water supply pump for supplying the water to the indirect evaporation cooling unit or changing the operation mode to the indirect evaporation cooling unit by controlling the on- And a controller for selectively opening and closing the first branch flow path for supplying the cooling air and the second branch flow path for supplying the cooling air branched from the cooling air flow path to the indirect evaporation cooling section. The method according to claim 1,
Wherein the reference temperature comprises a first reference temperature,
In a first operation mode when the temperature of the outside air is lower than the first reference temperature,
Wherein the controller controls the water supply pump to be turned off and controls the first branch passage and the second branch passage to be closed so that water, the outside air or the cooling air is not supplied to the indirect evaporation cooling section Characterized by an indirect evaporative cooling device. The method according to claim 1,
Wherein the reference temperature includes a first reference temperature and a second reference temperature that is higher than the first reference temperature,
In a second operation mode when the temperature of the outside air is between the first reference temperature and the second reference temperature,
The control unit controls the water supply pump to be turned on and controls the first branch flow path to be opened and controls the second branch flow path to be closed so that the external air and the first water temperature are supplied to the indirect evaporation cooling unit Wherein the water is supplied to the first evaporator. The method of claim 3,
Wherein the reference temperature includes a first reference temperature, a second reference temperature higher than the first reference temperature, and a third reference temperature higher than the second reference temperature,
In a third operation mode when the temperature of the outside air is between the second reference temperature and the third reference temperature,
Wherein the controller controls the water supply pump to be turned on and controls the first branch passage to be closed so that the second branch passage is opened so that the indirect evaporation cooling section Wherein cooling air having a cooling air dry bulb temperature and water having a second water temperature lower than the first water temperature are supplied to the indirect evaporation cooling apparatus. 5. The method of claim 4,
And an evaporative cooler for further cooling the water discharged from the indirect evaporative cooling unit and supplying the cooled water to the water supply pump,
Wherein the reference temperature includes a first reference temperature, a second reference temperature higher than the first reference temperature, and a third reference temperature higher than the second reference temperature,
In a fourth operation mode when the temperature of the outside air is higher than the third reference temperature,
Wherein the control unit controls the water supply pump and the evaporation cooler to be turned on so as to control the first branch passage to be closed and to open the second branch passage to open the first cooling air And cooling water having a second cooling air dry bulb temperature lower than the dry bulb temperature and water having a third water temperature lower than the second water temperature are supplied to the indirect evaporation cooling device. delete

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