KR20210027573A - Local cooling system in data center using latent heat of evaporation of refrigerant - Google Patents

Abstract

The present invention relates to a local cooling system in a data center using evaporative latent heat of refrigerants, which comprises: an outdoor unit which is installed outside a data center, and cools cooling water by heat exchange between the cooling water circulating along the inside and outside air; a refrigerator which is provided on one side of the data center, and cools a second heat exchange medium by heat exchange between a first refrigerant circulating in a refrigerating cycle and the second heat exchange medium; an indoor cooler which is installed adjacent to a server rack in the data center, and exchanges heat between the second refrigerant flowing along the inside and indoor air flowing in a hot zone of the server rack, and discharges the indoor air cooled by heat exchange between the second refrigerant and the indoor air to a cool zone of the server rack; and a control unit which is electrically connected to the outdoor unit, the refrigerator, and the indoor cooler and controls operations of the outdoor unit, the refrigerator, and the indoor cooler for each of a winter operation mode, an inter-season operation mode, and a summer operation mode. Accordingly, a liquid pump is controlled according to a load while a liquid refrigerant, the heating medium of the indoor cooler is circulated in the liquid pump, such that according to a change in the air-conditioning load, an active response is possible with low power consumption, and air blowing is made by convection and flow of indoor air according to the hot zone and cool zone of the server rack, and thus, a cooling operation is possible with a minimal air blowing means.

Description

Local cooling system in data center using latent heat of evaporation of refrigerant

The present invention relates to a local cooling system in a data center indoors using the latent heat of evaporation of a refrigerant, and more particularly, an indoor cooler for cooling indoor air (bent) on a ceiling or server rack in the data center, and a server rack. The hot air (exhaust) convective upward from the hot zone of is passed through the indoor cooler to cool the hot air (exhaust) through heat exchange with the heat medium, and then the cooled cold air (exhaust) is transferred to the cool zone of the server rack. The present invention relates to a local cooling system in a data center indoors using the latent heat of evaporation of a refrigerant that flows out to the (Cool Zone) and can cool indoors as well as around server racks with less power consumption than before due to the gain of airflow.

In general, a data center is more of an industrial building in which it is prioritized to keep the operating environment of IT equipment (servers) in an optimal state, rather than an occupied space in which people reside.

In other words, in order to protect equipment and provide stable operating conditions, more emphasis has been placed on environmental control rather than energy saving. This is because the economic loss caused by errors or failures of the IT equipment (servers) is much larger than the energy cost, so it did not consider an active energy saving method.

However, in line with the global trend, securing sustainable growth through IT has become an important task for companies, and recently, with the expansion of the cloud computing market, the computing environment is highly integrated, and a huge number of servers are running. The rapidly increasing energy consumption of data centers, which consume up to 40 times more energy than general buildings, is a social issue.

Therefore, operating a green Internet data center (Green IDC) system in which the conventional Internet data center operation method is improved in an eco-friendly and energy-saving method has emerged as an inevitable task.

For the air conditioning system of a conventional green Internet data center, “Internet Data Center Air Conditioning System Realizing a Green Computing Environment” of Korean Patent Laid-Open Publication No. 10-2011-0129514 was disclosed. And an air conditioner for ventilation and an air conditioner control device that controls the operation of the air conditioner, a temperature sensor that detects indoor and outdoor (ground and basement floors) temperatures and provides the information to the air conditioner control device, and an air conditioner. A ventilation duct for efficiently discharging heat generated from a rack equipped with a server and a network device to the outside, and a partition provided with a ventilation port associated therewith.

However, such a conventional air conditioning system of an Internet data center has a problem in that the energy saving method is not considered at all in the introduction and ventilation of outside air.

In addition, as a cooling method of a conventional Internet data center according to another example, a general mechanical cooling cycle is used in which power is supplied to a compressor to compress the refrigerant, the compressed refrigerant discharges heat from the condenser, and absorbs heat from the evaporator. I'm doing it.

In order to cool the exhaust air of about 35℃ that actually occurs inside the Internet data center, an air-cooled thermo-hygrostat is used individually, or a cooling tower is installed outside to supply the cooled water to the thermo-hygrostat to cool the room. The conventional cooling method contributes to energy saving in that it presupposes a large amount of power consumption in the compressor, which accounts for the largest share of the power consumption of the thermo-hygrostat, which must operate 24 hours a day, 365 days a year. I had a problem that I couldn't do.

Recently, as a way to improve energy efficiency of Internet data centers, an outdoor air cooling system has been applied that directly supplies cold air from outside in winter.

The present invention allows the liquid refrigerant, which is the heat medium of the indoor cooler, to circulate to the liquid pump, and controls the liquid pump according to the load, so that it is possible to actively respond with little power consumption according to the fluctuation of the air conditioning load, and the hot zone and cool zone of the server rack It is an object of the present invention to provide a local cooling system in a data center indoors using the latent heat of evaporation of a refrigerant capable of cooling operation with a minimum of blowing means, since air is blown using convection according to the following.

The local cooling system in the data center using the latent heat of evaporation of the refrigerant according to the present invention is installed outside the data center, an outdoor unit that cools the cooling water by heat exchange between the cooling water circulating inside and external air, and is provided at one side of the data center. , A refrigerator that cools the second heat exchange medium by heat exchange between the first refrigerant and the second heat exchange medium circulating in the refrigeration cycle, and the second refrigerant and server rack installed adjacent to the server rack in the data center indoors. An indoor cooler that heats indoor air flowing in a hot zone, and discharges indoor air cooled by heat exchange between the second refrigerant and indoor air to a cool zone of a server rack, and the outdoor unit, freezer and indoor And a control unit that is electrically connected to the cooler and controls the driving of the outdoor unit, the refrigerator, and the indoor cooler for each of a winter operation mode, an inter-season operation mode, and a summer operation mode.

At this time, the outdoor unit according to the present invention includes an external heat exchanger configured to pass external air through tubes through which cooling water flows to discharge cooling water cooled by heat exchange between the cooling water and external air, and a cooling water line through which the external air heat exchanger and cooling water flow. A first plate heat exchanger that is connected to heat exchange between the cooling water introduced through the cooling water line and the first heat exchange medium flowing along the inside, and cools the first heat exchange medium through heat exchange between the cooling water and the first heat exchange medium. Includes.

In addition, the refrigerator according to the present invention is connected to a compressor for introducing and compressing a first refrigerant through an inlet end and discharging it to an outlet end, and a first refrigerant line through which the compressor and the first refrigerant flow, and discharged from the compressor. The first refrigerant flows out from the second plate heat exchanger by being connected to a second plate heat exchanger that flows in and condenses the first refrigerant and then flows out, and the second plate heat exchanger is connected to a first refrigerant line through which the first refrigerant flows. And an expansion valve that flows out after inflow and expansion, and the expansion valve and the compressor are connected to a first refrigerant line through which the first refrigerant flows, and the first refrigerant discharged from the second plate-type heat exchanger is introduced and evaporated. And a third plate heat exchanger that flows out to the compressor.

In addition, the indoor cooler according to the present invention includes a liquid refrigerant pump that flows in a liquid second refrigerant through the inlet end and then pressurizes the liquid refrigerant to flow out to the outlet end, and a second refrigerant line through which the liquid refrigerant pump and the second refrigerant flow. Respectively, the second refrigerant discharged from the liquid refrigerant pump is introduced, the indoor air is passed through the tubes through which the second refrigerant flows, and the indoor air cooled by heat exchange between the second refrigerant and the indoor air, respectively. A plurality of internal air heat exchangers flowing out, the internal air heat exchangers and a second refrigerant line through which the second refrigerant flows, and the second refrigerant flowing out of the internal air heat exchanger are introduced, and the first heat exchange medium cooled by the outdoor unit is supplied. A fourth plate-type heat exchanger that cools and discharges the second refrigerant through heat exchange between the first heat exchange medium and the second refrigerant, and is connected to a second refrigerant line through which the fourth plate-type heat exchanger and the second refrigerant flow. A fifth plate type that cools the second refrigerant through heat exchange between the second heat exchange medium and the second refrigerant by introducing the second refrigerant from the fourth plate type heat exchanger while introducing the second heat exchange medium cooled in the refrigerator. Includes a heat exchanger.

Here, the fourth plate heat exchanger of the indoor cooler according to the present invention is connected to the first plate heat exchanger of the outdoor unit and a first heat exchange medium line through which the first heat exchange medium circulates, and the fifth plate heat exchanger of the indoor cooler is The second plate heat exchanger and the second heat exchange medium are connected by a second heat exchange medium line through which the second heat exchange medium flows.

In addition, the third plate heat exchanger of the refrigerator according to the present invention is connected to a cooling water line through which cooling water flows, heat exchange between the first refrigerant and cooling water introduced from the expansion valve, and the cooling water absorbs the heat of the first refrigerant. The refrigerant evaporates.

And a cooling water line provided at a branch point branching from the outlet end of the outside air heat exchanger to the second plate type heat exchanger of the refrigerator among the cooling water lines connected to the first plate type heat exchanger according to the present invention, and branching to the second plate type heat exchanger. A first three-way valve that selectively opens and closes, and a second three-way that is provided at a confluence point where the cooling water line passing through the second plate-type heat exchanger of the refrigerator merges toward the inlet end of the external heat exchanger, and selectively opens and closes the confluent cooling water line. Includes a valve.

At this time, the control unit according to the present invention controls the opening of the cooling water line connected to the first plate-type heat exchanger at the outlet end of the external heat exchanger with the first three-way valve in the winter operation mode, and the cooling water branched to the second plate-type heat exchanger. The line is closed-controlled, and the cooling water line joining the second plate-type heat exchanger to the inlet end of the external heat exchanger is closed and controlled by the second three-way valve, and connected from the first plate-type heat exchanger to the inlet end of the external heat exchanger. By controlling the opening of the cooling water line, the cooling water flows out of the external heat exchanger, passes through only the first plate heat exchanger, and is controlled to form a cooling water circulation path that flows back into the external heat exchanger.

In addition, the control unit according to the present invention controls the opening of the cooling water line connected to the first plate-type heat exchanger at the outlet end of the external heat exchanger with the first three-way valve in the interim operation mode, and branching to the second plate-type heat exchanger. The cooling water line is opened and controlled, and the cooling water line joining from the second plate-type heat exchanger to the inlet end of the external heat exchanger is opened and controlled by the second three-way valve, and from the first plate-type heat exchanger toward the inlet end of the external heat exchanger. The connected cooling water line is controlled to open, so that the cooling water flows out of the external heat exchanger, passes through the first plate heat exchanger and the second plate heat exchanger, and then flows back into the outdoor heat exchanger to form a cooling water circulation path.

In addition, in the case of the summer operation mode, the control unit according to the present invention controls the cooling water line connected to the first plate heat exchanger from the outlet end of the outside heat exchanger with the first three-way valve to close and control the cooling water branched to the second plate heat exchanger. The line is opened and controlled, and the cooling water line joining from the second plate-type heat exchanger to the inlet end of the external heat exchanger is closed and controlled by the second three-way valve, and connected from the first plate-type heat exchanger to the inlet end of the external heat exchanger. By controlling the opening of the cooling water line, the cooling water flows out of the external heat exchanger, passes only through the second plate heat exchanger, and flows back into the external heat exchanger to form a circulation path of cooling water.

The effects exhibited by the local cooling system inside the data center using the latent heat of evaporation of the refrigerant according to the present invention are as follows.

First, while the liquid refrigerant, which is a heat medium of the indoor cooler, is circulated to the liquid pump, the liquid pump is controlled by an inverter according to the load, so that an active response with little power consumption is possible according to the fluctuation of the air conditioning load.

Second, since the air is blown by convection and flow of indoor air according to the hot and cool zones of the server rack, cooling operation is possible with a minimum amount of blowing means.

Third, since the indoor cooler is disposed close to the server racks, it is possible to continuously supply air of a uniform temperature to the server rack locally.

Fourth, the use of the liquid refrigerant can bring the cold temperature supplied to the room high, so that condensed water does not occur in the indoor air, thereby increasing the safety of the server and increasing the refrigeration efficiency of the refrigerator.

Fifth, unlike outside air cooling, additional installation of ducts is not required, and compatibility is increased because it can be applied to existing buildings.

1 is an exemplary view schematically showing an implementation state of a local cooling system indoors in a data center using latent heat of evaporation of a refrigerant according to an embodiment of the present invention.
2 is an exemplary view showing a circulation path of a refrigerant, cooling water, and a heat exchange medium in a local cooling system indoors in a data center using latent heat of evaporation of a refrigerant according to an embodiment of the present invention.
3 is an exemplary view showing an internal air heat exchanger of an indoor cooler according to an embodiment of the present invention.
4 is an exemplary view showing a tube of an internal air heat exchanger according to an embodiment of the present invention.
5 is an exemplary view showing a refrigerant circulation path when a local cooling system indoors in a data center using latent heat of evaporation of a refrigerant according to an embodiment of the present invention is operated in a winter operation mode.
6 is an exemplary view showing a refrigerant circulation path when a local cooling system indoors in a data center using latent heat of evaporation of a refrigerant according to an embodiment of the present invention is operated in an intermittent operation mode.
7 is an exemplary view showing a refrigerant circulation path when a local cooling system indoors in a data center using latent heat of evaporation of a refrigerant according to an embodiment of the present invention is operated in a summer operation mode.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a 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 only the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention. It should be understood that there may be variations.

As shown in FIG. 1, the local cooling system in a data center using the latent heat of evaporation of a refrigerant according to an embodiment of the present invention includes a ceiling type having an indoor cooler 300 on an upper portion of the server rack 1, and an indoor cooler. 300) can be implemented in a stand type provided between the server racks 1, the ceiling type is provided with an indoor cooler 300 for cooling indoor air on the ceiling of the data center or above the server rack 1, and the server rack The hot indoor air convective upward in the hot zone of (1) is passed through the indoor cooler 300 to cool the hot indoor air by heat exchange with the refrigerant in the indoor cooler 300, and then the cooled cold room Air is discharged to the cool zone of the server rack 1, and the indoor air as well as the periphery of the server rack 1 can be cooled with less power consumption than before due to the gain of airflow due to the convection of indoor air.

And the stand type has an indoor cooler 300 that cools indoor air between the server racks 1 divided for each unit, and the indoor cooler ( 300), the indoor cooler 300 cools the hot indoor air by heat exchange with the refrigerant, and then the cooled cold indoor air flows out to the cool zone of the server rack, and the air flow according to the flow of the indoor air Due to the gain of, it is possible to cool not only the room but also the vicinity of the server rack 1 with less power consumption than the conventional one.

At this time, in the stand type, one side of the server racks 1 partitioned for each unit is contained as a wall, and the space contained by the wall is a hot zone, and the outside of the space is a cool zone. Zone), the hot indoor air flowing in the hot zone is passed through the indoor cooler 300 to cool the hot indoor air by heat exchange with the refrigerant in the indoor cooler 300, and then the cooled cold room By flowing air into the cool zone, it is possible to cool not only the room but also the server rack (1). Looking in more detail with reference to the drawings as follows.

In a local cooling system indoors in a data center using the latent heat of evaporation of a refrigerant according to an embodiment of the present invention with reference to FIG. 2, the outdoor unit 100, the refrigerator 200, the indoor cooler 300, and the control unit 400 are The outdoor unit 100 is installed outside the data center and cools the cooling water by heat exchange between the cooling water circulating through the interior and external air.

At this time, the cooling water cooled by external air cools the first heat exchange medium by heat exchange with the first heat exchange medium circulating in the indoor cooler 300, and the first heat exchange medium cooled by the cooling water is the indoor cooler 300 ), the second refrigerant is heat-exchanged with the second refrigerant circulating, and the second refrigerant cools the indoor air through heat exchange with the hot indoor air in the data center.

In more detail, the outdoor unit 100 according to an embodiment of the present invention includes an outdoor heat exchanger 110 and a first plate type heat exchanger 120 connected to each other through a cooling water line 10, and the outside heat exchanger The machine 110 passes external air through tubes through which the cooling water flows, and discharges the cooling water cooled by heat exchange between the external air and the cooling water.

Here, looking at the external heat exchanger 110 in more detail, the external heat exchanger 110 includes a frame forming a hexahedron through which front and rear surfaces communicate, and the frame has a core and a heat transfer fin therein.

The core is made of copper, which is one of materials with high thermal conductivity, and flows cooling water as a heat medium through a tube having a hollow, and a plurality of the cores are uniformly arranged along the top and bottom directions at a certain interval inside the frame. It is placed horizontally.

At this time, it is preferable that both left and right ends of the cores are exposed through the left and right sides of the frame, and both exposed ends are connected by a return band (U-bend) to be connected to one flow path, and the core is Heat is given or lost through heat exchange with air passing between the cores while flowing the heat medium along the left and right longitudinal directions through the inner hollow.

In addition, the heat transfer fins are made of copper or aluminum, one of materials having high thermal conductivity in the shape of a plate, and are vertically arranged perpendicularly to the plurality of cores along the left and right directions at regular intervals inside the frame.

At this time, a plurality of heat transfer fins arranged vertically inside the frame are orthogonally connected in a form through which a plurality of horizontally disposed cores pass through, so that the heat of the cooling water, which is a heat medium conducted from the plurality of cores, is exchanged with air through the heat transfer fins. Is cooled.

In addition, left and right headers are arranged on the left and right sides of the frame, respectively, and the left and right headers are vertically erected in a hollow tube made of copper, so that the left and right ends of a plurality of cores are left and right. Return bands are connected to the left and right headers, respectively, and communicate with the left and right headers.

Therefore, the external air heat exchanger 110 of the above configuration passes the external air through the tube through which the cooling water flows, and the cooling water cooled by heat exchange between the cooling water and the external air flows out to the first plate-type heat exchanger 120 as the next component.

In addition, the coolant flowing along the coolant line 10 flows by driving a coolant pump (not shown) provided on the coolant line 10, and the coolant pump (not shown) is driven by outside temperature. The drive is controlled by a control unit 400 that transmits a control signal according to the figure, and the outflow end of the external heat exchanger 110 is branched from the cooling water line 10 through a first three-way valve 11 The cooling water line 10 going to the second plate heat exchanger 220 of the refrigerator 200 is branched.

At this time, the branched cooling water line 10 passes through the second plate-type heat exchanger 220 of the refrigerator 200 and then again merges into the cooling water line 10 on the inlet side of the external heat exchanger 110, and at the point of confluence A second three-way valve 12 is provided, and the first three-way valve 11 and the second three-way valve 12 are electrically connected to the control unit 400, so that a winter operation mode, an inter-season operation mode, and a summer operation mode For each, the flow path of the cooling water line 10 is changed by the control unit 400.

And the first plate heat exchanger 120 is connected to the outside air heat exchanger 110 and a cooling water line 10 through which cooling water flows, and the cooling water flowing through the cooling water line 10 and flowing along the inside The first heat exchange medium is heat-exchanged, and the first heat exchange medium is cooled and discharged by heat exchange between the cooling water and the first heat exchange medium.

At this time, the first plate-type heat exchanger 120 forms a pair of inlets through which two types of heat medium are respectively introduced and a pair of outlet ports through which two types of heat medium (refrigerant, cooling water, and heat exchange medium) respectively flow out, and 0.6 to A 1.5mm thick stainless steel plate is processed into a corrugated shape, and several sheets are stacked at intervals of 4~7mm. Two types of heat transfer medium are introduced into each of the two types of heat medium and the flow path through which each heat medium flows is interviewed. In this case, the two types of heat medium indirectly exchange heat with each other.

Therefore, the first plate-type heat exchanger 120 is connected to the cooling water line 10 and the first heat exchange medium line 40, the cooling water flowing along the cooling water line 10, and the first heat exchange medium line 40 ) Flows along the first heat exchange medium, respectively, to exchange heat between the cooling water and the first heat exchange medium, so that the cooling water takes heat from the first heat exchange medium and heats it out by heat exchange between the cooling water and the first heat exchange medium. Then, the first heat exchange medium is cooled by taking away heat from the cooling water and then discharged.

In addition, the refrigerator 200 according to an embodiment of the present invention is provided at one side of the data center, and exchanges heat between the first refrigerant circulating in the refrigeration cycle and the introduced second heat exchange medium, so that the first refrigerant and the second heat exchange medium are The second heat exchange medium is cooled by heat exchange.

At this time, the first refrigerant of the refrigerator 200 flows along the first refrigerant line 20 to circulate in the order of compression, condensation, expansion, and evaporation, which are refrigeration cycles, and the compressor 210 on the first refrigerant line 20 ), a second plate type heat exchanger 220, an expansion valve 230, and a third plate type heat exchanger 240. First, the compressor 210 has a first refrigerant through an inlet end like a conventional compressor. After inflow and compression, it is discharged to the outlet end.

And the second plate heat exchanger 220 is connected to the compressor 210 and the first refrigerant line 20 through which the first refrigerant flows, and the first refrigerant discharged from the compressor 210 is introduced and condensed. Spill after.

At this time, the second plate-type heat exchanger 220 also has a pair of inlets for introducing two types of heat medium and a pair of outlets for outlet, respectively, and a stainless steel plate having a thickness of 0.6 to 1.5 mm is corrugated. It is processed and assembled by stacking several sheets at intervals of 4 to 7 mm. Two types of heat medium are introduced, and the flow path through which each heat medium flows is interviewed, and the two types of heat medium indirectly exchange heat with each other.

Therefore, the second plate-type heat exchanger 220 is connected to the first refrigerant line 20 and the cooling water line 10, the first refrigerant flowing along the first refrigerant line 20, and the cooling water line 10 ), the first refrigerant and the cooling water are heat-exchanged with each other, and the first refrigerant is condensed into cold of the cooling water by heat exchange between the first refrigerant and the cooling water. 1 It takes heat from the refrigerant and heats it to flow out.

In addition, the expansion valve 230 is connected to the second plate-type heat exchanger 220 and the first refrigerant line 20 through which the first refrigerant flows, and the first refrigerant flows out from the second plate-type heat exchanger 220. Flows in, expands and then flows out

And the third plate heat exchanger 240 is connected to the expansion valve 230 and the compressor 210 and the first refrigerant line 20 through which the first refrigerant flows, and in the second plate heat exchanger 220 The leaked first refrigerant is introduced and evaporated, and then discharged to the compressor 210.

Here, the third plate-type heat exchanger 240 of the refrigerator 200 is connected to a cooling water line 10 through which cooling water flows, and exchanges heat between the first refrigerant and cooling water introduced from the expansion valve 230, thereby removing cooling water. The first refrigerant evaporates by absorbing heat from the first refrigerant.

At this time, the third plate-type heat exchanger 240 also has a pair of inlets for inflowing two types of heat medium and a pair of outlets for outlets, respectively, and a stainless steel plate having a thickness of 0.6 to 1.5 mm is corrugated. It is processed and assembled by stacking several sheets at intervals of 4 to 7 mm. Two types of heat medium are introduced, and the flow path through which each heat medium flows is interviewed, and the two types of heat medium indirectly exchange heat with each other.

Therefore, the third plate-type heat exchanger 240 is connected to the first refrigerant line 20 and the second heat exchange medium line 50, the first refrigerant flowing along the first refrigerant line 20, and the first refrigerant. 2 The second heat exchange medium flowing along the heat exchange medium line 50 is introduced into each of the first refrigerant and the second heat exchange medium to exchange heat with each other, so that the first refrigerant is exchanged with the second heat exchange medium. Is evaporated by taking heat from the second heat exchange medium, and the second heat exchange medium is cooled and discharged from the heat from the first refrigerant.

In addition, the indoor cooler 300 according to an embodiment of the present invention is installed adjacent to the server rack 1 in the data center indoors, and a hot zone of the server rack 1 in the second refrigerant flowing along the inside of the data center. The indoor air that flows in is passed through, the indoor air is cooled by heat exchange between the second refrigerant and the indoor air in the indoor cooler 300, and the cooled indoor air is discharged to the cool zone of the server rack 1. .

At this time, the indoor cooler 300 includes a liquid refrigerant pump 310, an internal air heat exchanger 320, a fourth plate heat exchanger 330, and a fifth plate heat exchanger 340. First, the liquid refrigerant The pump 310 introduces the liquid second refrigerant through the inlet end, pressurizes it, and discharges it to the outlet end.

Here, the liquid refrigerant pump 310 inverter controls the rotational speed of the impeller according to the load (indoor temperature), and by changing the frequency or voltage according to the load (indoor temperature) to adjust the rotational speed of the impeller, the delivery amount of the liquid refrigerant And adjust the pressure.

And the internal air heat exchanger 320 is installed adjacent to the server rack 1, and is connected to the liquid refrigerant pump 310 and a second refrigerant line 30 through which the second refrigerant flows, and the liquid refrigerant pump The second refrigerant discharged from 310 is introduced, the indoor air is passed through the tube through which the second refrigerant flows, and the indoor air cooled by heat exchange between the second refrigerant and the indoor air is discharged.

At this time, the internal air heat exchanger 320 with reference to FIGS. 3 and 4 includes a first header 321, a second header 322, tubes 323, and heat exchange fins 324. The first header 321 and the second header 322 are disposed so that both sides face each other and are spaced apart.

In addition, in the first header 321 and the second header 322, the entrances and exits are arranged at set intervals in a direction facing each other, and the tubes 323 communicate with each other, and the pressure loss of the refrigerant is large, so that the first header The flow rate is distributed to the tubes 323 using 321 and the second header 322.

Here, the tubes 323 serve as fluid passages, and in order to maximize the heat transfer efficiency, the aluminum tube is extruded flat or the aluminum plate is folded to form a flat tube 323, but the present invention is not limited thereto, and the flat tube The 323 can be formed in various ways.

The flat tube 323 is formed with a plurality of flow paths along the left and right width lengths at regular intervals, wherein fine pins 326 protrude along the inner surfaces of the flow paths 325 to form an inner area of the flow path To increase the heat exchange efficiency.

The flow paths 325 may be formed in a parallelogram or elliptical shape as another modified example, and the flow paths are not limited thereto, and the lengths of the flow paths are the same, but the upper and lower surfaces thereof face each other and are formed in a semicircle. Alternatively, it may be formed into a polygon or the like.

The heat exchange fins 324 are disposed between spaces adjacent to the flat tube 323, and the heat exchange fins 324 are continuously bent in a zigzag manner between the flat tubes 323 It is disposed between the tubes 323 to facilitate heat exchange with fluid passing through a large heat transfer area.

Therefore, the internal air heat exchanger 320 having the above configuration passes hot indoor air flowing in the hot zone of the server rack through the flat tube 323 through which the second refrigerant flows, and follows the flat tube 323. The cold indoor air cooled by heat exchange between the flowing second refrigerant and hot indoor air is discharged to the cool zone of the server rack 1, so that not only the room but also the server rack 1 and its surroundings are cooled.

At this time, the indoor air naturally flows in and out of the indoor air flowing at a density difference according to temperature without a separate ventilation means, so the indoor air as well as the server rack (1) with little power consumption due to the convection of the indoor air and the gain of the air flow due to the flow. Can be cooled.

In addition, the fourth plate-type heat exchanger 330 is connected to the internal air heat exchanger 320 and the second refrigerant line 30 through which the second refrigerant flows, and the second refrigerant flowing out of the internal air heat exchanger 320 While flowing in, the first heat exchange medium cooled by the outdoor unit 100 is introduced, and the second refrigerant is cooled and discharged through heat exchange between the first heat exchange medium and the second refrigerant.

Here, the fourth plate heat exchanger 330 of the indoor cooler 300 is connected to the first plate heat exchanger 120 of the outdoor unit 100 and the first heat exchange medium line 40 through which the first heat exchange medium flows. , The fourth plate-type heat exchanger 330 is connected to the second refrigerant line 30 and the first heat exchange medium line 40, the second refrigerant flowing along the second refrigerant line 30, and the second refrigerant 1 Each of the first heat exchange media flowing along the heat exchange medium line 40 is introduced, and the second refrigerant and the first heat exchange medium are exchanged with each other, so that the second refrigerant is exchanged between the second refrigerant and the first heat exchange medium. The first heat exchange medium is cooled by taking heat from the first heat exchange medium, and the first heat exchange medium is heated and discharged from the second refrigerant.

And the fifth plate-type heat exchanger 340 is connected to the fourth plate-type heat exchanger 330 and a second refrigerant line 30 through which the second refrigerant flows, and flows out from the fourth plate-type heat exchanger 330. The second heat exchange medium cooled in the refrigerator 200 is introduced while the second refrigerant is introduced, and the second refrigerant is cooled and discharged through heat exchange between the second heat exchange medium and the second refrigerant.

Here, the fifth plate heat exchanger 340 of the indoor cooler 300 is connected to the third plate heat exchanger 240 of the refrigerator 200 and the second heat exchange medium line 50 through which the second heat exchange medium flows. , A second refrigerant flowing along the second refrigerant line 30 and a second heat exchange medium flowing along the second heat exchange medium line 50, respectively, to supply the second refrigerant and the second heat exchange medium. By heat exchange between the second refrigerant and the second heat exchange medium, the second refrigerant is cooled by taking away heat from the second heat exchange medium, and the second heat exchange medium is heated and discharged by taking heat from the second refrigerant. do.

In addition, the control unit 400 according to an embodiment of the present invention is electrically connected to the outdoor unit 100, the refrigerator 200, and the indoor cooler 300, and the outdoor unit 100 and the refrigerator according to the temperature and humidity of the outside air. (200) and control the driving of the indoor cooler (300).

At this time, the control unit 400 controls the driving of the outdoor unit 100, the refrigerator 200, and the indoor cooler 300 and the circulation path of the coolant for each of the winter operation mode, the interseason operation mode, and the summer operation mode. Is the same as

In the winter operation mode as shown in FIG. 5, when the winter operation mode is selected by a signal transmitted from the control unit 400 of the indoor cooling system of the data center, the first three-way valve 11 is used at the outlet end of the outdoor heat exchanger 110. The cooling water line 10 connected to the first plate-type heat exchanger 120 is opened and controlled, the cooling water line 10 branched to the second plate-type heat exchanger 220 is closed-controlled, and the second three-way valve ( 12) closing control of the cooling water line 10 joining the inlet end of the outside heat exchanger 110 from the second plate heat exchanger 220, and the outside heat exchanger ( 110) By controlling the opening of the cooling water line 10 connected to the inlet end, the cooling water flows out from the external heat exchanger 110, passes through only the first plate-type heat exchanger 120, and flows back into the external heat exchanger 110. It is controlled to form a cooling water circulation path.

At this time, only the outdoor unit 100 and the indoor cooler 300 are driven by the above-described control. The outdoor unit 100 cools the coolant with cold winter air and delivers it to the indoor cooler 300. The cooling water delivered to the indoor cooler 300 cools and condenses the second refrigerant circulated by the liquid refrigerant pump 310, and the cooled and condensed second refrigerant is distributed and supplied to each internal air heat exchanger 320, and the server The hot air (blow) convective upward in the hot zone of the rack (1) is passed through the internal air heat exchanger (320) to cool the hot air (blow) through heat exchange with the heat medium, and then cooled cold air. The server rack (1) is cooled by spilling (bet) into the cool zone of the server rack (1).

The second refrigerant flowing out of the internal air heat exchanger 320 is evaporated to a gaseous state and passed through the fourth plate heat exchanger 330 and the fifth plate heat exchanger 340, wherein the liquid refrigerant pump 310 is The inverter is controlled according to the indoor temperature, and the efficiency is highest as free cooling by outside air is applied in the winter operation mode.

In the interim operation mode shown in FIG. 6, when the inter-season operation mode is selected by a signal transmitted from the control unit 400 of the indoor cooling system of the data center, the first three-way valve 11 is used at the outlet end of the outdoor heat exchanger 110. The cooling water line 10 connected to the first plate heat exchanger 120 is opened and controlled, the cooling water line 10 branched to the second plate heat exchanger 220 is opened and controlled, and the second three-way valve ( 12) to open and control the cooling water line 10 joining the inlet end of the outside heat exchanger 110 from the second plate heat exchanger 220, and the outside heat exchanger ( 110) By controlling the opening of the cooling water line 10 connected to the inlet end, the cooling water flows out of the outdoor heat exchanger 110, and passes through the first plate heat exchanger 120 and the second plate heat exchanger 220. After that, it is controlled to form a circulation path of cooling water flowing back into the external heat exchanger 110.

At this time, the cooling water discharged from the outdoor unit 100 is circulated to the refrigerator 200 and the indoor cooler 300, respectively, and in the case of an intermittent season, the server rack 1 is cooled only by free cooling. Since the temperature is insufficient, insufficient refrigeration capacity is compensated through the refrigerator 200, and the refrigerator 200 is selectively driven according to the outside air and indoor temperature.

In the summer operation mode shown in FIG. 7, when the summer operation mode is selected by a signal transmitted from the control unit 400 of the indoor cooling system of the data center, the first three-way valve 11 is used at the outlet end of the outdoor heat exchanger 110. The cooling water line 10 connected to the first plate-type heat exchanger 120 is closed and controlled, the cooling water line 10 branched to the second plate-type heat exchanger 220 is opened and controlled, and the second three-way valve ( 12) closing control of the cooling water line 10 joining the inlet end of the outside heat exchanger 110 from the second plate heat exchanger 220, and the outside heat exchanger ( 110) By controlling the opening of the cooling water line 10 connected to the inlet end, the cooling water flows out from the external heat exchanger 110, passes only through the second plate-type heat exchanger 220, and flows back into the external heat exchanger 110. It is controlled to form a cooling water circulation path.

At this time, in the case of the summer season, the temperature of the outside air is high and free cooling through the outside air is impossible, so that all the cooling water cooled in the outdoor unit 100 flows out to the second plate-type heat exchanger 220 of the refrigerator 200 , So that the first refrigerant is condensed in the second plate-type heat exchanger 220.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1: server rack 10: cooling water line
11: first three-way valve 12: second three-way valve
20: first refrigerant line 30: second refrigerant line
40: first heat exchange medium line 50: second heat exchange medium line
100: outdoor unit 110: outdoor heat exchanger
120: first plate type heat exchanger 200: refrigerator
210: compressor 220: second plate heat exchanger
230: expansion valve 240: third plate heat exchanger
300: indoor cooler 310: liquid refrigerant pump
320: internal air heat exchanger 330: fourth plate type heat exchanger
340: fifth plate heat exchanger 400: control unit

Claims (10)

An outdoor unit installed outside the data center to cool the cooling water by heat exchange between the cooling water and external air circulating along the inside;
A refrigerator provided at one side of the data center and cooling the second heat exchange medium by heat exchange between the first refrigerant and the second heat exchange medium circulating in the refrigeration cycle;
It is installed adjacent to the server rack in the data center and heat-exchanged with the second refrigerant flowing along the inside and indoor air flowing in the hot zone of the server rack, and cooled by heat exchange between the second refrigerant and the indoor air. An indoor cooler that discharges indoor air to the cool zone of the server rack; And
Data using the latent heat of evaporation of the refrigerant including a control unit that is electrically connected to the outdoor unit, refrigerator, and indoor cooler and controls the driving of the outdoor unit, refrigerator, and indoor cooler in any one of a winter operation mode, an inter-season operation mode, and a summer operation mode. Local cooling system in the center interior.
The method according to claim 1,
The outdoor unit
An external air heat exchanger configured to pass external air through the tubes through which the cooling water flows to discharge cooling water cooled by heat exchange between the cooling water and external air;
The external heat exchanger is connected to the cooling water line through which the cooling water flows, and the cooling water introduced through the cooling water line and the first heat exchange medium flowing along the inside are heat-exchanged, thereby exchanging the first heat by heat exchange between the cooling water and the first heat exchange medium. A first plate-type heat exchanger that cools and discharges a medium; a local cooling system in a data center using latent heat of evaporation of a refrigerant including.
The method according to claim 2,
The freezer
A compressor for introducing and compressing the first refrigerant through the inlet end and then discharging the first refrigerant to the outlet end;
A second plate-type heat exchanger connected to the compressor through a first refrigerant line through which the first refrigerant flows, and flowing in and condensing the first refrigerant discharged from the compressor;
An expansion valve connected to the second plate heat exchanger through a first refrigerant line through which the first refrigerant flows, and flowing in and expanding the first refrigerant flowing out of the second plate heat exchanger;
A third plate heat exchanger connected to the expansion valve and the compressor through a first refrigerant line through which the first refrigerant flows, inflows and evaporates the first refrigerant discharged from the second plate heat exchanger, and then discharges the first refrigerant to the compressor; A local cooling system in the data center using the latent heat of evaporation of the refrigerant containing
The method of claim 3,
The indoor cooler
A liquid refrigerant pump for introducing a liquid second refrigerant through the inlet end and then pressurizing the liquid refrigerant to flow out to the outlet end;
The liquid refrigerant pump and the second refrigerant are respectively connected to a second refrigerant line through which the second refrigerant flows, the second refrigerant flowing out of the liquid refrigerant pump is introduced, and indoor air is passed through the tubes through which the second refrigerant flows, A plurality of internal air heat exchangers for outflowing the indoor air cooled by heat exchange between the second refrigerant and the indoor air;
The internal air heat exchangers are connected to a second refrigerant line through which the second refrigerant flows, the second refrigerant discharged from the internal air heat exchanger flows in, the first heat exchange medium cooled by the outdoor unit is introduced, and the first heat exchange medium A fourth plate heat exchanger configured to cool the second refrigerant through heat exchange between the second refrigerant and the second refrigerant;
The fourth plate-type heat exchanger is connected to a second refrigerant line through which the second refrigerant flows, and while the second refrigerant flowing out of the fourth plate-type heat exchanger flows in, the second heat exchange medium cooled in the refrigerator is introduced. 2 A fifth plate heat exchanger for cooling and outflowing the second refrigerant by heat exchange between the heat exchange medium and the second refrigerant; and a local cooling system in the data center using the latent heat of evaporation of the refrigerant.
The method of claim 4,
The fourth plate heat exchanger of the indoor cooler is connected to the first plate heat exchanger of the outdoor unit by a first heat exchange medium line through which the first heat exchange medium circulates,
The fifth plate-type heat exchanger of the indoor cooler uses the latent heat of evaporation of a refrigerant connected to the second plate-type heat exchanger of the refrigerator and a second heat exchange medium line through which a second heat exchange medium flows.
The method of claim 4,
The third plate-type heat exchanger of the refrigerator is connected to a cooling water line through which cooling water flows, and heat exchange between the first refrigerant and cooling water introduced from the expansion valve, so that the cooling water absorbs heat of the first refrigerant and the first refrigerant evaporates. Local cooling system inside data center using latent heat of evaporation of refrigerant.
The method of claim 4,
The first plate-type heat exchanger is provided at a branch point branching from the outlet end of the outside air heat exchanger to the second plate-type heat exchanger of the refrigerator among cooling water lines connected to the first plate-type heat exchanger, and selectively opens and closes the cooling water line branching to the second plate-type heat exchanger. A three-way valve;
A second three-way valve provided at a confluence point of the cooling water line passing through the second plate-type heat exchanger of the refrigerator, which merges toward the inlet end of the external heat exchanger, selectively opening and closing the confluent cooling water line; and the latent heat of evaporation of the refrigerant including Local cooling system in indoor data center.
The method of claim 7,
The control unit
In winter operation mode,
The first three-way valve controls the opening of the cooling water line connected to the first plate-type heat exchanger at the outlet end of the outdoor heat exchanger, and closing control of the cooling water line branching to the second plate-type heat exchanger,
The second three-way valve closes and controls the cooling water line joining the inlet end of the external heat exchanger from the second plate-type heat exchanger, and controls the opening of the cooling water line connected to the inlet end of the external heat exchanger from the first plate-type heat exchanger. ,
A local cooling system in a data center indoors using the latent heat of evaporation of the refrigerant to control the cooling water to form a circulation path of cooling water flowing out of the outside air heat exchanger, passing through only the first plate heat exchanger, and flowing back to the outside air heat exchanger.
The method of claim 7,
The control unit
In the interim operation mode,
The first three-way valve controls opening of the cooling water line connected to the first plate-type heat exchanger at the outlet end of the external heat exchanger, and opening-controls the cooling water line branching to the second plate-type heat exchanger,
The second three-way valve controls opening of the cooling water line joining the inlet end of the external heat exchanger from the second plate-type heat exchanger, and opening-controls the cooling water line connected to the inlet end of the external heat exchanger from the first plate-type heat exchanger. ,
A local part of the data center indoors using the latent heat of evaporation of the refrigerant to control the cooling water to form a circulation path of cooling water flowing out of the external heat exchanger, passing through the first plate heat exchanger and the second plate heat exchanger, and then flowing back to the outside heat exchanger. Cooling system.
The method of claim 7,
The control unit
In the summer operation mode,
The first three-way valve controls the closing of the cooling water line connected to the first plate-type heat exchanger at the outlet end of the outdoor heat exchanger, and opens-controls the cooling water line branching to the second plate-type heat exchanger,
The second three-way valve closes and controls the cooling water line joining the inlet end of the external heat exchanger from the second plate-type heat exchanger, and controls the opening of the cooling water line connected to the inlet end of the external heat exchanger from the first plate-type heat exchanger. ,
A local cooling system in a data center indoors using the latent heat of evaporation of the refrigerant to control the cooling water to form a circulation path of cooling water flowing out of the external heat exchanger, passing through only the second plate-type heat exchanger, and flowing back to the external heat exchanger.

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