KR101814074B1 - Air-conditioning system using the outside air cold water - Google Patents

Abstract

The present invention relates to a refrigeration cycle in which a refrigerant is circulated along a first circulation line in the order of a first compressor, a first condenser, a first expansion valve, and a first evaporator, The second compressor, the second condenser, the second expansion valve, and the second evaporator in this order, while circulating the refrigerant along the second circulation line, the outside air having passed through the first evaporator of the first cooling portion is discharged to the second evaporator And a precooling unit for precooling the outside air before being drawn into the first evaporator of the first cooling unit by the cold water cooled by the heat exchange method so that the outside air passes through the cooling unit for cooling the outside air The cooling load of the air conditioning system is minimized and the cold water of the cooling tower is used as the energy source, And provides a constant temperature and humidity system using outside cold water which can actively operate according to the temperature of the outside air.

Description

{Air-conditioning system using the outside air cold water}

The present invention relates to a constant temperature and humidity system for purifying outside air (outside air) and introducing outside air whose temperature, humidity, and air amount are controlled, and is characterized in that before being passed through a cooling unit for cooling outside air, The precooling unit using cold water precooled the outside air, then passed the outside air through the cooling unit, and selectively cooled the outside air to single or multi-stage according to the temperature of the precooled outside air. .

Typically, data centers lease computing and networking facilities to businesses and individuals, and provide services such as maintenance and maintenance by attracting customers' facilities. These data centers usually include data servers and databases, including communication devices. A plurality of racks are installed in a row and include a work space where workers can work.

On the other hand, since the apparatus including the above-described server rack is not smoothly operated at high temperature and generates heat during operation, the data center needs a cooling device for cooling it. Furthermore, in the case of electronic components and circuits, there is a risk of short circuit if there is a large amount of moisture in the data center, and problems such as generation of static electricity, sparks, and breakage of electronic parts are likely to occur.

Therefore, in the data center, an air conditioner for cooling and constant temperature and humidity is installed. Examples of such technologies include Korean Patent Registration Nos. 10-0478755, 10-1103394, 10-2010-0013312, The technology for various air conditioners installed in the air conditioner has been disclosed.

The conventional technology is to circulate the outdoor air to the data center by cooling or heating the outdoor air to the designated temperature to keep the data center at constant temperature and humidity or to mix the outdoor air and the indoor air or to cool the indoor air by the heat exchanger using the refrigerant .

As an example of a heat exchanger using a refrigerant, a gaseous refrigerant compressed at a high pressure in a compressor is condensed in a high-pressure liquid refrigerant by heat exchange with the outside air while passing through a condenser, and is then discharged through a expansion valve or capillary, Refrigerant.

The low-pressure sprayed refrigerant flows into the evaporator, is evaporated by heat exchange with the indoor air, and then flows into the compressor again. The cycle of the above-described process is circulated. At this time, the air cooled by the evaporation heat of the refrigerant generated in the evaporator is blown And is blown to a predetermined space to be cooled by the fan.

That is, such a general cooling system cools a predetermined space to be cooled by using a refrigerant whose phase change is easy, such as liquefaction and evaporation.

However, the conventional technology described above has a problem in that consumption of energy for cooling the outside air and the inside air is increased.

Therefore, the present invention precools the outside air before it is introduced into the first evaporator of the first cooling unit by using the cold water cooled by the heat exchanging method in the pre-cooling unit before passing the outside air to the cooling unit for cooling the outside air, The cooling load of the harmonic system is minimized and the foreign substances contained in the refrigerant discharged from the receiver to the expansion valve are removed through the dryer and the state of the high pressure high temperature refrigerant flowing along the circulation line through the sight glass is visually confirmed The present invention aims to provide a constant temperature and humidity system using external cold water capable of efficiently operating and capable of actively coping.

The constant temperature and humidity system using external cold water according to the present invention circulates a refrigerant along a first circulation line in the order of a first compressor, a first condenser, a first expansion valve, and a first evaporator, A second condenser, a second expansion valve, and a second evaporator in this order, while circulating the refrigerant in the order of the second compressor, the second condenser, the second expansion valve, and the second evaporator, And a second cooling section that selectively cools outside air passing through the second evaporator through a second evaporator, wherein the second cooling section is disposed on a first circulation line between the first condenser and the first expansion valve of the first cooling section, A first side for providing a flow path through which the refrigerant is directly bypassed from the first compressor to the first receiver; and a second side disposed on the first side, Through the first circulation line, The refrigerant pressure at the outlet side of the first condenser circulating from the condenser to the first receiver is compared with the refrigerant pressure at the inlet side of the first condenser which is circulated from the first compressor to the first condenser, A first differential pressure valve for bypassing a part of the refrigerant from the first condenser to the first condenser outlet side through the first side line to adjust the pressure of the refrigerant at the outlet side of the first condenser which is circulated from the first condenser to the first receiver, A first drier provided on a first circulation line between the first expansion valve and the first expansion valve for removing foreign matter contained in the refrigerant discharged from the first receiver to the first expansion valve, Pressure refrigerant flowing along the first circulation line to visually confirm the state of the high-pressure and high-temperature refrigerant flowing along the first circulation line, and a second circulation line between the second condenser and the second expansion valve of the second cooling section, line And a second side for providing a flow path for bypassing the refrigerant directly to the second receiver in the second compressor, and a second side disposed in the second receiver for temporarily storing the refrigerant liquid of high pressure and high temperature liquefied in the second condenser, And a second condenser inlet side of the second condenser that is circulated from the second compressor to the second condenser, the refrigerant pressure of the second condenser outlet side being circulated from the second condenser to the second receiver through the second circulation line, And selectively bypassing a portion of the refrigerant circulating on the inlet side of the second condenser to the second condenser outlet side through the second side to separate the refrigerant from the second condenser outlet which is circulated from the second condenser to the second receiver, And a second expansion valve that is provided on the second circulation line between the second condenser and the second expansion valve and is included in the refrigerant liquid sent from the second receiver to the second expansion valve To remove foreign matter Further comprising a second drier and a second sidewall disposed behind the second drier for allowing the user to visually confirm the state of the high-pressure and high-temperature refrigerant flowing along the second circulation line, A cooling tower disposed in front of the first evaporator of the first cooling section and connected to the first cold water circulation line and the second cold water circulation line of the cooling tower in parallel to provide cold water to the first condenser and the second condenser through a cold water circulation line; A cold water coil connected to the cooling water circulation line, the cold water coil for precooling the outside air before being drawn into the first evaporator by the cold water cooled by the cooling tower in a heat exchange manner, and a second cold water circulation line The cold water sent out from the cooling tower is selectively cooled according to the temperature of the cold water flowing along the first cold water circulation line based on the temperature of the predetermined cold water, To flow to the coil, including the three-way valve that opens and closes the second flow path of the cold water circulation line, the cooling line to the outside air before it is drawn into the first evaporator, the first cooling portion to the cold water cooled by the heat exchange system.

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The constant temperature and humidity system using external cold water according to the present invention has the following effects.

First, before the outside air passes through the cooling unit for cooling the outside air, the precooling unit precools the outside air before being drawn into the first evaporator of the first cooling unit by using the cold water cooled by the heat exchange method, The foreign matter contained in the refrigerant discharged from the receiver to the expansion valve is removed through the dryer and the state of the high-pressure high-temperature refrigerant flowing along the circulation line through the sight glass can be visually confirmed It is possible to actively cope with it, and thus it is possible to operate efficiently.

Second, heat exchange efficiency is improved by indirect heat exchange with cold water, and there is no humidity change, and cold water of the cooling tower is used as an energy source, so that energy efficiency is increased.

Thirdly, a plurality of cooling units for cooling the precooled outside air are provided, and either one of the cooling units alone can be driven according to the temperature of the outside air, or a plurality of the cooling units can be driven to actively cope with the load, It has a possible effect.

Fourthly, a differential pressure valve is provided which compares the refrigerant pressure at the inlet side of the condenser with the outlet refrigerant pressure in the cooling section and selectively bypasses the refrigerant at the inlet side of the condenser to the outlet of the condenser, so that the pressure loss generated in the condensing process is compensated, Is prevented from being lowered.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a constant temperature and humidity system using outside cold water according to an embodiment of the present invention; FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

In the present invention, the outside air is pre-cooled in a pre-cooling unit using cold water cooled by heat exchange before the outside air is passed through the cooling unit for cooling the outside air, and then supplied to the cooling unit. The present invention relates to a constant-temperature and constant-humidity system using outside-air cold water for further cooling the outside air in single or multi-stage, and will be described with reference to the drawings.

At this time, the outside air described in the present invention is not limited to the outside air drawn in from the outside, and the air cooled through the pre-cooling unit according to the present invention is referred to as an outside air.

Referring to FIG. 1, the constant temperature and humidity system using external cold water according to the present invention includes a first cooling unit 100 and a second cooling unit 200, which are selectively driven according to the temperature of the outside air to cool the outside air into single or multi- And a pre-cooling unit 300 for pre-cooling the outside air before passing through the cooling units 100 and 200.

The first cooling unit 100 according to the present invention includes a compressor, a condenser, an expansion valve, and an evaporator as in a normal cooling cycle. First, the low-pressure low-temperature refrigerant gas is compressed through the first compressor 110, Of the refrigerant gas.

The compressor which can be employed here is not limited to any one, and any of reciprocating, scroll, screw and centrifugal compressors may be employed.

The high-pressure and high-temperature refrigerant gas compressed by the first compressor 110 is sent to the first condenser 120 along the first circulation line 101, and the refrigerant gas of high pressure and high temperature is discharged from the first condenser 120 Condensed and converted into a high-pressure and high-temperature refrigerant liquid.

At this time, in the first condenser 120, cold water of the pre-cooling unit 300 is used to condense the high-pressure and high-temperature refrigerant gas. The high-pressure and high-temperature refrigerant gas compressed by the first compressor 110 flows into the first condenser 120, cooled in the first condenser 120 by the heat exchange method with cold water of the pre-cooling unit 300, and condensed.

Accordingly, the high-pressure and high-temperature refrigerant liquid is converted into the high-pressure and high-temperature refrigerant liquid as it is condensed by the heat exchange method with the cold water of the pre-cooling unit 300, And is sent to the first expansion valve 140 through the line 101.

The first expansion valve 140 reduces the pressure of the high-pressure and high-temperature refrigerant liquid to a pressure capable of causing evaporation by the throttle action to convert the refrigerant into a low-pressure low-temperature refrigerant.

In this case, the first receiver 130 is disposed on the first circulation line 101 between the first condenser 120 and the first expansion valve 140, and the first condenser 120 condenses The high-pressure and high-temperature refrigerant liquid is sent to the first receiver 130 before sending the high-pressure and high-temperature refrigerant liquid to the first expansion valve 140.

The first receiver 130 is disposed on the first circulation line 101 between the first condenser 120 and the first expansion valve 140 and is condensed and liquefied in the first condenser 120 Temperature high-temperature refrigerant liquid is temporarily stored, the refrigerant gas in the high-pressure and high-temperature refrigerant liquid discharged from the first condenser 120 is separated, and only the high-pressure and high-temperature refrigerant liquid is sent to the first expansion valve 140.

A first side line 102 is provided in the first compressor 110 so that the refrigerant liquid flows directly to the first receiver 130. A first differential valve 103 is provided on the first side line 102 And is selectively opened in response to the pressure of the refrigerant sent from the first condenser 120 to the first receiver 130 so that the refrigerant from the first compressor 110 to the first condenser 110 120 is bypassed to the first circulation line between the first condenser 120 and the first receiver 130 so that the refrigerant from the first condenser 120 to the first receiver 130 The pressure of the refrigerant to be delivered is regulated.

More specifically, the first differential pressure valve 103 is disposed on the first side line 102 and is connected to the first condenser 120 through the first circulation line 101 to the first receiver 130 The refrigerant pressure at the outlet side of the circulating first condenser 120 is compared with the refrigerant pressure at the inlet side of the first condenser 120 circulated from the first compressor 110 to the first condenser 120, When the refrigerant pressure at the outlet side of the first condenser 120 is lower than the refrigerant pressure at the inlet side of the first condenser 120, a part of the refrigerant circulated at the inlet side of the first condenser 120 flows into the first condenser 120 through the first bypass 102, The pressure of the refrigerant at the outlet side of the first condenser 120 circulated from the first condenser 120 to the first receiver 130 is regulated by bypassing to the outlet of the first condenser 120 to prevent a decrease in the cooling efficiency.

Therefore, the first differential pressure valve 103 is selectively opened and closed by using the refrigerant pressure difference between the inlet and outlet of the first condenser 120, so that the pressure loss generated in the condensing process is compensated to prevent a decrease in the cooling efficiency.

A first stop valve 104 is further disposed on the first side line 102. The first stop valve 104 is disposed at a front end of the first differential pressure valve 103, (102) is closed to control the driving of the first differential pressure valve (103).

A first drier 105, a first site glass 106, and a first slave node valve 107 are disposed on a first circulation line 101 between the first condenser 120 and the first expansion valve 140 The foreign material and the like contained in the refrigerant discharged from the first receiver 130 to the first expansion valve 140 are removed through the first dryer 105 and the first window glass 106, The first slave node valve 107 is electrically connected to a control unit (not shown), and the first slave node valve 107 is electrically connected to the control unit And the flow of the refrigerant discharged from the first receiver 130 to the first expansion valve 140 is interrupted.

The first expansion valve 140 lowers the pressure of the high-pressure and high-temperature refrigerant discharged from the first receiver 130 by the throttling action, expands the capacity of the refrigerant, .

At this time, the high-pressure and high-temperature refrigerant sent out from the first receiver 130 is converted into a low-pressure low-temperature refrigerant liquid through the first expansion valve 140 and is sent to the first evaporator 150.

The first evaporator 150 evaporates the low-pressure low-temperature refrigerant discharged from the first expansion valve 140 through a heat-exchange coil. As the refrigerant evaporates, the first evaporator 150 absorbs the heat of the outside air passing through the heat- And the vaporized low-pressure low-temperature refrigerant liquid is converted into a low-temperature low-pressure refrigerant gas.

Accordingly, the first cooling unit 100 allows the outside air drawn in from the outside to pass through the first evaporator 150, and the first evaporator 150 vaporizes the low-temperature and low-temperature refrigerant, The heat of the outside air passing through the first evaporator 150 is taken and the outside air is cooled.

The second cooling unit 200 for selectively cooling the outside air having passed through the first evaporator 150 of the first cooling unit 100 also includes a compressor, a condenser, an expansion valve, and an evaporator like a normal cooling cycle The low-pressure and low-temperature refrigerant gas is first compressed through the second compressor 210 to be converted into a high-pressure and high-temperature refrigerant gas.

The high-pressure and high-temperature refrigerant gas compressed by the second compressor 210 is sent to the second condenser 220 along the second circulation line 201, and the second refrigerant gas of the high- Condensed and converted into a high-pressure and high-temperature refrigerant liquid.

At this time, in the second condenser 220, cold water of the pre-cooling unit 300 is used to condense the high-pressure and high-temperature refrigerant gas. The high-pressure and high-temperature refrigerant gas compressed by the second compressor 210 is supplied to the second condenser 220 and cooled in the second condenser 220 in a heat exchange manner with the cold water of the pre-cooling unit 300 and condensed.

Accordingly, the high-pressure and high-temperature refrigerant liquid is converted into the high-pressure and high-temperature refrigerant liquid as it is condensed by the heat exchange method with the cold water of the pre-cooling unit 300, And is sent to the second expansion valve 230 through the line 201.

The second expansion valve 240 reduces the pressure of the high-pressure and high-temperature refrigerant liquid to a pressure capable of causing evaporation by the throttle action to convert the refrigerant into a low-pressure low-temperature refrigerant liquid.

In this case, the second receiver 230 is disposed on the second circulation line 201 between the second condenser 220 and the second expansion valve 240, and the second condenser 220 condenses The high-pressure and high-temperature refrigerant liquid is sent to the second receiver 130 before the high-pressure and high-temperature refrigerant liquid is sent to the second expansion valve 240.

The second receiver 230 is disposed on the second circulation line 201 between the second condenser 220 and the second expansion valve 240 and is condensed and liquefied in the second condenser 220 Temperature high-temperature refrigerant liquid is temporarily stored, the refrigerant gas in the high-pressure and high-temperature refrigerant liquid discharged from the second condenser 220 is separated, and only the refrigerant liquid of high-pressure and high-temperature is delivered to the second expansion valve 240.

A second side passage 202 is provided in the second compressor 210 so that the refrigerant liquid flows directly to the second receiver 230. On the second side passage 202 is connected a second differential pressure valve 203 And is selectively opened according to the pressure of the refrigerant sent from the second condenser 220 to the second receiver 230 so that the refrigerant from the second compressor 210 to the second condenser 220 to a second circulation line between the second condenser 220 and the second receiver 230 so that the refrigerant from the second condenser 220 to the second receiver 230 The pressure of the refrigerant discharged is adjusted.

More specifically, the second differential pressure valve 203 is disposed on the second bypass line 202 and is connected to the second condenser 220 through the second circulation line 201 to the second receiver 230 The refrigerant pressure at the outlet side of the circulating second condenser 220 is compared with the refrigerant pressure at the inlet side of the second condenser 220 circulated from the second compressor 210 to the second condenser 220, When the refrigerant pressure at the outlet side of the second condenser 220 is lower than the refrigerant pressure at the inlet side of the second condenser 220, a part of the refrigerant circulated at the inlet side of the second condenser 220 flows through the second bypass 202, The pressure of the refrigerant at the outlet side of the second condenser 220, which is circulated from the second condenser 220 to the second receiver 230, is regulated by bypassing to the outlet of the second condenser 220, thereby preventing a decrease in the cooling efficiency.

Accordingly, the second differential pressure valve 203 is selectively opened and closed using the refrigerant pressure difference between the inlet and outlet of the second condenser 220, so that the pressure loss generated during the condensing process is compensated to prevent the cooling efficiency from being lowered.

A second stop valve 204 is further disposed on the second side 202. The second stop valve 204 is disposed at the front end of the second differential pressure valve 203, (202) is closed to control the driving of the second differential pressure valve (203).

A second drier 205, a second site glass 206, and a second slave node valve 207 are disposed on the second circulation line 201 between the second condenser 220 and the second expansion valve 240 The foreign material contained in the refrigerant discharged from the second receiver (230) to the second expansion valve (240) is removed through the second dryer (205), and the second window glass (206) Temperature high-temperature refrigerant liquid flowing along the second circulation line 201 through the second circulation line 201. The second slave node valve 207 is electrically connected to a control unit (not shown) And the flow of the refrigerant sent from the second receiver (230) to the second expansion valve (240) is interrupted.

The second expansion valve 240 lowers the pressure of the high-pressure and high-temperature refrigerant discharged from the second receiver 230 by the throttling action, expands the capacity of the refrigerant, .

At this time, the high-pressure and high-temperature refrigerant sent out from the second receiver (230) is converted into a low-pressure low-temperature refrigerant liquid through the second expansion valve (240) and is sent to the second evaporator (250).

The second evaporator 250 evaporates the low-pressure low-temperature refrigerant discharged from the second expansion valve 240 through a heat exchange coil. As the refrigerant evaporates, the second evaporator 250 absorbs the heat of the outside air passing through the heat- And the vaporized low-pressure low-temperature refrigerant liquid is converted into a low-temperature low-pressure refrigerant gas.

Accordingly, the second cooling unit 200 allows the outside air passing through the first evaporator 150 of the first cooling unit 100 to pass through the second evaporator 250, and the second evaporator 250 of the second cooling unit 200, As the refrigerant liquid is vaporized, the refrigerant at low temperature is vaporized, and the heat of the outside air passing through the second evaporator 250 is taken away to cool the outside air.

At this time, it is preferable that the driving of the second cooling unit 200 is selectively driven according to the temperature of the outside air.

As described above, the control of the first cooling unit 100 and the second cooling unit 200 is controlled by driving the first compressor 110 and the second compressor 210. At this time, depending on the temperature of the outside air, The first compressor 110 and the second compressor 210 are driven to cool the outside air.

For example, when the temperature of the outside air is lower than the first predetermined temperature, the first compressor 110 and the second compressor 210 are not driven so that the outside air is not cooled,

When the temperature of the outside air is between the first set temperature and the second set temperature, only the compressor of the first compressor (110) and the second compressor (210) is driven to cool the outside air, The precooling unit 300 is also driven so that the outside air is precooled by the precooling unit 300 before being cooled by the cooling unit, and then is transferred to the cooling unit to be cooled, thereby minimizing the load increase of the cooling unit.

When the temperature of the outside air is higher than the second predetermined temperature, both the first compressor (110) and the second compressor (210) are driven to cool the outside air.

The air conditioning system according to the present invention includes a precooling unit 300 for precooling outside air before entering the first evaporator 150 of the first cooling unit 100 with cold water cooled by a heat exchange system, The pre-cooling unit 300 includes a cooling tower 310 for cooling cold water by a heat exchange method. The cooling tower 310 includes a first cold water circulation line 301 through which cold water circulates, a first condenser 120, 2 condenser (220).

The first condenser 120 and the second condenser 220 may be connected to the cooling tower 310 in parallel.

The cold water is forcibly circulated along the first cold water circulation line 301 by driving the circulation pump 302 provided on the first cold water circulation line 301, And the coil 320 is connected in parallel to the second cold water circulation line 303.

At this time, the cold water coil 320 is disposed at the front end of the first evaporator 150 of the first cooling unit 100, and the outside air before the cold water cooled by the cooling tower 310 is introduced into the first evaporator 150 Precooled by heat exchange method.

A three-way valve 330 is provided at a point where the first cold water circulation line 301 and the second cold water circulation line 303 at the outlet side of the cold water coil 320 cross each other, The second cold water is supplied to the cold water coil 320 so that the cold water discharged from the cooling tower 310 selectively flows in accordance with the temperature of the cold water flowing along the first cold water circulation line 301, And the flow path of the circulation line 303 is opened or closed.

For example, if the temperature of the cold water flowing along the first cold water circulation line 301 is 15 ° C or more, the 3-way valve 330 can prevent the cold water sent from the cooling tower 310 from flowing into the cold water coil 320 So that cold water flows from the cooling tower 310 only to the first condenser 120 and the second condenser 220 along the first cold water circulation line 301 and to the first cold water circulation line 301 Way valve 330 opens the flow path so that the cold water sent from the cooling tower 310 flows to the cold water coil 320 and the cold water flows from the cooling tower 310 to the cooling tower 310. [ A part of the refrigerant flows through the first cold water circulation line 301 and flows into the cold water coil 320 so as to be heat-exchanged with the outside air and then flows back to the first condenser 120 and the second condenser 220.

Accordingly, in the pre-cooling air conditioning system according to the present invention, the precooling unit precools the outside air using the cold water cooled by the heat exchange method, and then provides the cooled air to the cooling unit. Provided by cooling the outside air into single or multi-stage.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: first cooling section 101: first circulation line
102: first side 103: first differential pressure valve
104: first stop valve 105: first dryer
106: first sight glass 107: first slave node valve
110: first compressor 120: first condenser
130: first receiver 140: first expansion valve
150: first evaporator 200: second cooling part
201: second circulation line 202: second side
203: second differential pressure valve 204: second stop valve
205: Second dryer 206: Second site glass
207: second slave node valve 210: second compressor
220: second condenser 230: second receiver
240: second expansion valve 250: second evaporator
300: pre-cooling unit 301: cold water circulation line
302: circulation pump 310: cooling tower
320: cold water coil 330: 3 way valve

Claims (4)

A first cooling unit that selectively circulates the outside air introduced from the outside through the first evaporator while circulating the refrigerant along the first circulation line in the order of the first compressor, the first condenser, the first expansion valve, and the first evaporator; , The second compressor, the second condenser, the second expansion valve, and the second evaporator, while circulating the refrigerant along the second circulation line, the outside air passing through the first evaporator of the first cooling portion is selectively 1. A constant temperature and humidity system using external cold water including a second cooling part for cooling,
A first receiver disposed on a first circulation line between the first condenser and the first expansion valve of the first cooling section and temporarily storing the high-pressure and high-temperature refrigerant liquid liquefied in the first condenser;
A first side for providing a flow path for bypassing the refrigerant directly from the first compressor to the first receiver;
A first condenser outlet disposed on the first side and circulating from the first condenser to the first receiver through the first circulation line and a second condenser inlet circulating from the first compressor to the first condenser; The first refrigerant is circulated from the first condenser to the first receiver by bypassing a portion of the refrigerant selectively circulating on the inlet side of the first condenser to the outlet side of the first condenser through the first side, A first differential pressure valve for adjusting the pressure of the refrigerant at the outlet side;
A first dryer disposed on a first circulation line between the first condenser and the first expansion valve to remove foreign substances contained in the refrigerant discharged from the first receiver to the first expansion valve;
Further comprising a first sight glass disposed behind the first dryer for visually confirming a state of the high-pressure and high-temperature refrigerant flowing along the first circulation line,
A second liquid receiver disposed on a second circulation line between the second condenser and the second expansion valve of the second cooling section for temporarily storing the high-pressure and high-temperature refrigerant liquid liquefied in the second condenser;
A second side for providing a flow path for bypassing the refrigerant directly from the second compressor to the second receiver;
A second condenser inlet disposed on the second side for circulating from the second compressor to the second condenser and a refrigerant pressure on the second condenser outlet side circulated from the second condenser to the second receiver through the second circulation line, The second refrigerant circulates from the second condenser to the second receiver by bypassing a part of the refrigerant selectively circulating at the inlet side of the second condenser to the outlet side of the second condenser through the second side, A second differential pressure valve for adjusting the pressure of the refrigerant at the outlet side;
A second dryer disposed on a second circulation line between the second condenser and the second expansion valve for removing foreign matters contained in the refrigerant discharged from the second receiver to the second expansion valve;
Further comprising a second window glass disposed behind the second dryer for visually confirming a state of the high-pressure and high-temperature refrigerant flowing along the second circulation line,
A cooling tower for supplying cold water cooled by a heat exchange system to the first condenser and the second condenser through a cold water circulation line;
The outdoor unit is disposed in front of the first evaporator of the first cooling unit and connected in parallel to the first cold water circulation line and the second cold water circulation line of the cooling tower, A cold water coil for preheating the cold water;
And a second cold water circulation line connected to the first cold water circulation line and the second cold water circulation line, wherein the first cold water circulation line and the second cold water circulation line are connected in parallel to each other, Way valve that opens and closes the flow path of the second cold water circulation line so that the cold water sent out from the cooling tower selectively flows into the cold water coil so that the cold water cooled by the heat exchange method is introduced into the first evaporator of the first cooling part Constant temperature and humidity system using external cold water to cool external air.
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