JP2012002390A - High-load air-conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioning system adaptable to step-by-step mounting or removal of a server apparatus or the like, or to any non-uniform indoor heat load distribution or the like, which can reduce working frequency of maintenance, control or the like of an air-conditioner in a server room, and can prevent any influence of condensed water or dew condensation water of a cooling coil on the server apparatus or the like.SOLUTION: An air-conditioner (10) is arranged in an underfloor chamber (9) immediately below a cold aisle (C). The air-conditioner includes a cooler (12) for cooling air, an air supply fan (11) for air circulation, and a cold air outlet (8). The air supply fan forms an air circulation circuit which sucks hot air from a hot aisle (H) via a floor suction port (7), cools it by the cooler, and supplies the cold air to the cold aisle upwardly from a floor outlet. The hot air which is heat-exchanged with an electronic apparatus (S) flows out to the hot aisle. The cooler cools the hot air and removes the sensible heat of the electronic apparatus.

Description

  The present invention relates to a high-load air conditioning system, and more particularly to a high-load air conditioning system provided in a room in which electronic devices that generate a large amount of sensible heat are arranged in a hot aisle / cold aisle system.

  The construction of data centers, IT equipment management facilities or mobile phone base station server rooms, computer rooms or communication equipment rooms that accommodate high-load electronic equipment such as a large number of server equipment, routers, IT equipment, and communication equipment has increased rapidly in recent years. ing. Since this type of facility accommodates a large number of electronic devices that generate a large amount of sensible heat in a room, a high-load air conditioning system for removing the sensible heat of the electronic devices is provided.

  For example, server devices in data centers and the like have become particularly highly integrated and dense in recent years, and as a result of the generation of a large amount of sensible heat in the server room, the power consumption required for cooling the server room has increased rapidly. There is a tendency to Many server devices have a structure in which cool air is sucked in from the front and warm air is exhausted from the back. For this reason, in such a server room, the air intake surface on the front side of the server rack is opposed to form a cold aisle between the air intake surfaces, and the exhaust surface on the back side of the server rack is arranged to face the hot aisle between the exhaust surfaces. A hot-aisle / cold-aisle layout is generally employed that forms and thereby improves the thermal efficiency of the air conditioning system.

  Japanese Patent No. 3835615 (Patent Document 1) describes such an air conditioning system of a data center or a server room. The air conditioner that cools the server room blows cool air to the underfloor chamber and supplies the cold air to the cold aisle through the breathable floor of the cold aisle. The cold air is blown upward into the cold aisle and is supplied into the server rack from the intake surface (front surface) of the server rack. The warm air heated by removing heat from the server equipment is exhausted from the exhaust surface of the server rack to the hot aisle or the indoor upper space, and is returned to the air conditioner.

  Regarding such an air conditioning system for a data center or a server room, a downflow type air conditioning system in which an air conditioner is installed at the top of the cold aisle and cool air is blown downward from the top of the cold aisle is described in JP 2009-133617 A Has been.

Japanese Patent No. 3835615 JP 2009-133617 A

  However, the conventional air conditioning system (Patent Document 1) that air-conditions the entire server room with a single system air-conditioning system is configured to circulate conditioned air throughout the server room. Requires air transport power. In addition, since this air conditioning system is configured with the entire room as a unit, the air conditioning system must be designed assuming that all server devices are mounted. It is difficult to expand or reduce the air conditioning system in accordance with the replacement or removal.

  Further, in such an air conditioning system that air-conditions the entire server room, it is not possible to perform air conditioning adapted to a non-uniform indoor heat load distribution, and thus thermal efficiency cannot be sufficiently improved.

  On the other hand, according to the air conditioning system (Patent Document 2) in which air conditioners are distributed on the top of the cold aisle, it is possible to arbitrarily add or remove air conditioners according to the mounting, replacement, or removal of server equipment. In addition, the air conditioner can be arranged and controlled according to the heat load distribution.

  However, in such an air conditioning system, it is necessary to perform maintenance, maintenance, management, expansion / removal, etc. of the air conditioner in the server room. Moreover, there is a risk that condensed water, condensed water, etc. of the cooling coil may be generated at the top of the server rack, and if the cooling coil is damaged or damaged, the heat medium may be leaked into the server room. .

  The present invention has been made in view of such problems, and the object of the present invention is to adapt to the stepwise mounting or removal of server equipment and the like, uneven indoor heat load distribution, etc. Reduce the frequency of work such as maintenance, maintenance and management of air conditioners, and prevent the condensate or dew condensation water of the cooling coil or the damage or damage of the cooling coil from affecting the server equipment, etc. It is to provide an air conditioning system that can do this.

In order to achieve the above object, the present invention provides an air conditioning system provided in a room in which an electronic device that generates a large amount of sensible heat is arranged in a hot aisle / cold aisle system,
Having an air conditioner placed in the underfloor chamber directly under the cold aisle,
The air conditioner includes an air cooling cooler, an air circulation supply fan, and a cold air blowing port.
The cold air blowing port is composed of or connected to a floor air outlet disposed on the floor surface of the cold aisle,
The air supply fan sucks hot air in the hot aisle through a floor suction port arranged on the floor surface of the hot aisle, cools it by the cooler, and blows the cold air upward from the floor air outlet to the cold aisle. Forming an air circulation circuit,
The cold air exchanges heat with the electronic device and flows out into the hot aisle as the warm air.
The cooler provides an air conditioning system that cools the warm air and removes sensible heat of the electronic device.

  According to the above configuration of the present invention, a local air circulation circuit including a cold aisle, an electronic device, a hot aisle, and a cooler is formed. Since this air circulation circuit is formed by an air conditioner in the underfloor chamber, it is possible to form a plurality of air circulation circuits corresponding to staged mounting or removal of server equipment or the like by adding or removing the air conditioner. Further, since the air circulation circuit corresponding to the heat load distribution can be formed by setting the position of the air conditioner and the cooling capacity, it is possible to adapt to the non-uniform indoor heat load distribution and the like. Furthermore, the air conditioner placed in the underfloor chamber can perform maintenance, maintenance, management, etc. in the underfloor chamber. Condensed water or condensed water in the cooling coil, breakage / damage of the cooling coil, etc. Does not affect the electronic equipment.

  Preferably, the air conditioner is supported by a pedestal disposed in the underfloor chamber, and is disposed close to the floor level of the room and spaced from the floor surface of the underfloor chamber. If desired, the cooler constitutes a vaporizer or an evaporator of a heat medium circuit of a natural refrigerant circulation system.

  If desired, an auxiliary air conditioner is placed on top of the cold aisle. The auxiliary air conditioner sucks and cools the warm air exchanged with the electronic equipment, and blows the cooled air down to the cold aisle. Preferably, the air cooling cooler of the auxiliary air conditioner constitutes a vaporizer or an evaporator of a refrigerant natural circulation heat medium circuit.

  According to the air conditioning system of the present invention, while adapting to the stepwise mounting or removal of server equipment, etc., uneven indoor heat load distribution, etc., the frequency of work such as maintenance or maintenance / management of the air conditioner in the server room is reduced. In addition, it is possible to prevent the condensate water or dew condensation water of the cooling coil or the breakage / damage of the cooling coil from affecting the server equipment.

FIG. 1 is an air conditioning system flow diagram showing a configuration of an air conditioning system according to a preferred embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the structure of the server room provided with the air conditioning system shown in FIG. 3 is a cross-sectional view taken along the line II of FIG. 4 is a cross-sectional view taken along line II-II in FIG. FIG. 5 is an air conditioning system flow diagram showing a configuration of an air conditioning system according to another embodiment of the present invention. FIG. 6 is an air conditioning system flow diagram showing a modification of the embodiment shown in FIG. It is a longitudinal cross-sectional view which shows the structure of the server room provided with the air conditioning system shown in FIG.5 and FIG.6. It is sectional drawing in the III-III line of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an air conditioning system flow diagram showing a configuration of an air conditioning system according to a preferred embodiment of the present invention. In FIG. 1, the flow of the air flow circulating through the air circulation circuit is conceptually indicated by arrows.

  The server room 1 includes a floor structure 2 having a double floor structure composed of a floor surface material 3 and a floor slab 4, a partition wall 5 that partitions the server room 1 from other rooms, outdoor spaces, and the like, And a ceiling structure 6 that partitions the server room 1 from the upper floor. The ceiling structure 6 is composed of an upper floor structure or a roof structure. An underfloor chamber 9 is formed below the floor surface component 3. The ceiling height G of the server room 1 is set to 3.5 to 4.0 m, for example, 3.7 m. The distance N from the upper surface of the floor slab 4 to the floor surface F is set to 2.0 to 2.5 m, for example, 2.2 m.

  A large number of air-cooled server racks S are arranged on the floor F of the server room 1. A plurality of server devices and the like (not shown) are mounted in each server rack S. Each server rack S has a fan (not shown) for taking in cold air from the front surface Sa constituting the operation surface and exhausting heat from the rear surface Sb into the server room 1. The server rack S is arranged in a hot aisle / cold aisle system generally adopted in this type of server room. In the hot aisle / cold aisle layout, the housing front surfaces Sa that require air supply are arranged to face each other, the cold aisle C is formed between the housing front surfaces Sa, and the housing back surfaces Sb that perform heat exhaustion between them. Are arranged opposite to each other, and a hot aisle H is formed between the housing rear surfaces Sb. A shielding plate B that shields the cold aisle C from the indoor upper space is arranged so as to bridge the upper part of the adjacent server racks S. The shielding plate B reliably partitions the cold aisle C from the indoor upper space and prevents cold air in the cold aisle C from flowing out into the indoor upper space. Also, as shown in FIG. 4, it is desirable that both ends of the cold aisle C are also shielded from the indoor space of the server room 1 by the shield E. Preferably, the shield E is composed of a door D such as a sliding door or a hinged door, and a frame or blind panel P surrounding the door D. The shielding plate B and the shielding body E clearly define the cold aisle C, and substantially all of the cold air supplied to the space in the cold aisle C is reliably and efficiently supplied to the server equipment in the server rack S. I care. The shield E may be formed of a flexible film material such as a screen or a sheet.

  As shown in FIG. 1, a large number of floor inlets 7 and floor outlets 8 are arranged on the floor surface F. The floor suction port 7 and the floor outlet 8 are made of, for example, a perforated member or a breathable member such as a walkable metal grating that constitutes a part of the floor surface, and the floor suction port 7 and the floor outlet 8 are opened. The rate is set in the range of 60-80%, for example about 70%.

  A heat pump air conditioner 10 is disposed in the underfloor chamber 9. The air conditioner 10 is suspended from the floor surface component 3 or its support member. The floor outlet 8 constitutes a cold air outlet of the air conditioner 10.

  An air-cooled heat pump type external conditioner 30 that blows adjusted outside air to the underfloor chamber 9 is disposed in the underfloor chamber 9. The outside air conditioner 30 is connected to an outside air introduction duct 31, and the outside air introduction duct 31 is connected to an outside air inlet 32 for taking in outside air OA. The external air conditioner 30 includes a blower 33 and a cooling coil 34. The cooling coil 34 is connected to the outdoor unit 37 via the heat medium circulation pipes 35 and 36. The cooling coil 34 is a direct expansion coil through which refrigerant circulates, and the outdoor unit 37 has a condenser and a blower.

  The outside air conditioner 30 adjusts the temperature and humidity of the outside air OA taken in through the outside air inlet 32 and the outside air introduction duct 31 by the cooling coil 34, and sends the adjusted outside air to the underfloor chamber 9 under the blowing pressure of the blower 33. . If desired, the cooling coil 34 may be used as a cooling / heating coil, or a reheating coil or the like may be incorporated into the external conditioner 30.

  The exhaust air 40 exhausts substantially the same amount of room air as the outside air supplied to the server room 1 from the server room 1 to the outside of the system. The exhaust system 40 includes an exhaust port 41 disposed in the upper part of the server room 1, and an exhaust duct 42 and an exhaust fan 43 connected to the exhaust port 41.

  The air conditioner 10 disposed immediately below each cold aisle includes an air supply fan 11 and a cooling coil 12. The cooling coil 12 is connected to the outdoor unit 15 via the heat medium circulation pipes 13 and 14. Each cooling coil 12 is a direct expansion coil that circulates refrigerant, and each outdoor unit 15 has a condenser and a blower.

  The air conditioner 10 takes in the air in the underfloor chamber 9 through the cooling coil 12 under the suction pressure of the air supply fan 11 and cools it by the cooling coil 12. For example, the intake air temperature of the air conditioner 10 is set to 29 ° C., and the blown air temperature of the air conditioner 10 is set to 16 ° C. The cool air adjusted by the cooling coil 12 is blown upward from the floor outlet 8 under the discharge pressure of the air supply fan 11.

  The floor outlet 8 is arrange | positioned in the floor part of each cold aisle C, and the cool air of the air conditioner 10 is ventilated upward to each cold aisle C. The cool air blown into the cold aisle C is sucked into the housing by each server rack S by a built-in fan (not shown), and heat is removed from the server equipment and the like in the housing. The air heated by heat exchange with the server device or the like flows out to the hot aisle H from the back of the casing as warm air.

  The warm air flowing out to the hot aisle H flows through the floor suction port 7 under the suction pressure of the air supply fan 11 and flows into the underfloor chamber 9 and is sucked into the air supply fan 11, as described above, by the cooling coil 12. It is cooled and supplied to the cold aisle C from the floor outlet 8.

  Therefore, the air conditioning system of the present embodiment has the air conditioner 10 disposed in the underfloor chamber immediately below each cold aisle C, and the cold air blower port of the air conditioner 10 is connected to the floor outlet of the server room 1. 8, the air supply fan 11 of the air conditioner 10 forms an air circulation circuit including the hot aisle H, the floor suction port 7, the underfloor chamber 9, the cooling coil 12, the floor outlet 8, and the cold aisle C, and is air-conditioned. The cooling coil 12 of the machine 10 cools the air circulating in the air circulation circuit, and removes heat generated by the server equipment and the like in the server rack S.

  According to such an air conditioning system, a local air circulation circuit is formed in the immediate vicinity of the server rack S, and heat generated by the server device or the like can be efficiently removed, so that the thermal efficiency of the entire system can be improved.

  In addition, since the air conditioning system has a configuration in which the air conditioners 10 are dispersedly arranged in units of cold aisles, the air conditioners 10 are installed in the underfloor chamber 9 in stages in accordance with the stepwise installation or removal of the server rack S. Or it can be removed. That is, according to the above air conditioning system, local cool air circulation corresponding to the mounting of the server rack S is possible. Therefore, compared with the conventional air conditioning system that requires cool air circulation throughout the server room 1, the blowing power is reduced and the thermal efficiency is improved. It is extremely advantageous in terms of improving controllability.

  Furthermore, since the underfloor chamber 9 has a height (distance N) at which an operator, a worker, and the like can move and work, the air conditioner 10 can be relatively easily expanded, removed, replaced, maintained, and the like. In addition, since the heat medium circulation pipes 13 and 14 are piped in the underfloor chamber 9, even if condensed water or condensed water, heat medium leakage, or the like occurs, the server equipment in the server room 1 Etc. are not substantially affected. Therefore, the air conditioning system is advantageous in terms of maintenance / management and expansion / removal / replacement of the air conditioner 10 and operation maintenance of the server equipment.

  FIG. 5 is an air conditioning system flow diagram showing a configuration of an air conditioning system according to another embodiment of the present invention. In FIG. 5, the flow of the air flow circulating through the air circulation circuit is conceptually indicated by arrows. In FIG. 5, components that are substantially the same as the components shown in FIG. 1 are given the same reference numerals.

  In the air conditioning system of the present embodiment, the cooling coils 12 and 34 of the air conditioner 10 and the external air conditioner 30 are composed of a cold water circulation type heat exchanger, and the cold water feed pipe 17 and the cold water reflux pipe 18 are the cooling coil 12, 34. The cold water supply pipe 17 and the cold water reflux pipe 18 are connected to a cold heat source (not shown) such as a chiller. The cooling coils 12 and 34 cool the air or the outside air with the cold water circulating through the cold water circulation circuit including the cold water supply pipe 17 and the cold water reflux pipe 18. Since the cooling coils 12 and 34, the cold water feed pipe 17 and the cold water reflux pipe 18 are piped in the underfloor chamber 9, even if condensed water or dew condensation water, leakage of the pipe line or heat exchanger, etc. occur, The server equipment in the server room 1 is not substantially affected.

  In the present embodiment, an auxiliary air conditioner 50 is disposed on the top of the cold aisle C. The air conditioner 50 is operated in an auxiliary or transient manner when the temperature distribution in the cold aisle C is unbalanced or uneven in temperature, etc. It is steadily operated so that an air flow is generated in the cold aisle C.

  The air conditioner 50 has a configuration in which an air supply fan 51 and a cooling coil 52 are built in a housing disposed at the top of the cold aisle C. The casing of the air conditioner 50 is supported by a frame (not shown) of the server rack S, or is supported by an independent frame (not shown). A horizontal air outlet 60 facing the cold aisle C is disposed on the lower surface of the casing of the air conditioner 50. The cooling coil 52 is connected to the heat exchanger 55 in the cold water circulation tank 56 via the heat medium circulation pipes 53 and 54. The cold water circulation tank 56 is connected to a branch pipe of the cold water supply pipe 17 and the cold water reflux pipe 18, and the cold water in the cold water circulation circuit circulates in the cold water circulation tank 56. The cooling coil 52, the heat medium circulation pipes 53 and 54, the heat exchanger 55, and the cold water circulation tank 56 constitute a refrigerant natural circulation system (VCS (registered trademark of the present applicant)), and the refrigerant condensed in the heat exchanger 55. Flows through the heat medium circulation pipe 53 under gravity and is supplied to the cooling coil 52, and the refrigerant evaporated in the cooling coil 52 rises in the heat medium circulation pipe 54 and returns to the heat exchanger 55. Such a refrigerant natural circulation system (VCS) is described in detail in, for example, Japanese Patent Application Laid-Open No. 11-230577, and further detailed description thereof is omitted.

  According to the air conditioning system according to the present embodiment, the airflow distribution and the temperature distribution in the cold aisle C are optimized by the cool air of the air conditioner 50, or the cooling capacity of the entire air conditioning system according to the change in the thermal load of the server device. Can be adjusted or increased. Moreover, in this embodiment, since cold water is used as a heat source of the air conditioner 10, the thermal efficiency of the whole building including the server room 1 can be improved by sharing or centralized management of the heat source. Furthermore, since the air conditioner 50 of this embodiment is a structure using the refrigerant | coolant natural circulation type refrigerant | coolant circulation circuit, risks, such as a water leak, can be eliminated or reduced.

  FIG. 6 is an air conditioning system flow diagram showing a modification of the embodiment shown in FIG.

  The embodiment shown in FIG. 5 has a configuration in which the refrigerant natural circulation system (VCS) is applied only to the air conditioner 50. However, the air conditioning system of the present embodiment (FIG. 6) uses the refrigerant natural circulation system (VCS). It has the structure applied to the air conditioners 10 and 50 and the external air conditioner 30.

  The cooling coils 12, 34, 52 of the air conditioners 10, 50 and the external air conditioner 30 are connected to the heat exchangers 55, 59 in the cold water circulation tank 56 via the heat medium circulation pipes 53, 54, 57, 58. . The chilled water circulation tank 56 is connected to the chilled water supply pipe 17 and the chilled water return pipe 18, and the chilled water in the chilled water circulation circuit circulates in the chilled water circulation tank 56. The cooling coils 12, 34, 52, the heat medium circulation pipes 53, 54, 57, 58, the heat exchangers 55, 59 and the chilled water circulation tank 56 constitute a refrigerant natural circulation system (VCS), and the heat exchangers 55, 59. The refrigerant condensed in the above flowed down in the heat medium circulation pipes 53, 57 under gravity and supplied to the cooling coils 12, 34, 52. The refrigerant evaporated in the cooling coils 12, 34, 52 is heated in the heat medium circulation pipe 54. , 58 is raised and returned to the heat exchangers 55 and 59. According to such a configuration, power for circulating the refrigerant can be greatly reduced.

  2 is a longitudinal sectional view showing the structure of the server room 1 provided with the air conditioning system shown in FIG. 1, and FIGS. 3 and 4 are sectional views taken along lines II and II-II in FIG. . In FIGS. 2 to 4, the flow of air flowing through the air circulation circuit is conceptually indicated by arrows. Moreover, in each figure of FIGS. 2-4, the same referential mark is attached | subjected about the component substantially the same as each component shown in FIG.

  The floor structure 2 of the server room 1 has a structure in which a floor surface component 3 is supported by an upper chord member 21 of a truss beam 20 made of a steel structure truss and a concrete slab 4 is supported by a lower chord member 22 of the truss beam 20. Have A horizontal member 24 for suspending the support frame 25 of the air conditioner 10 in the underfloor chamber 9 is suspended on the small beam 23 interconnecting the truss beams 20. The column 26 of the gantry 25 hangs down from the horizontal member 24, and the support stage 27 of the gantry 25 is horizontally fixed to the lower end portion of the column 26, and is arranged at a distance from the upper surface of the floor slab 4.

  The air conditioner 10 is supported on the support stage 27 via a vibration isolator or the like. The cooling coils 12 are arranged in the casing of the air conditioner 10 in pairs so as to correspond to the server racks S arranged on both sides of the cold aisle C. The air supply fan 11 of the air conditioner 10 sucks the air in the underfloor chamber 9 through the left and right cooling coils 12. The cooling coil 12 is connected to the outdoor unit 15 via the heat medium circulation pipes 13 and 14 as shown in FIG.

  As described above, the flow of warm air from the hot aisle H to the underfloor chamber 9 through the floor suction port 7 (indicated by a double line arrow), and the cooling coil 12 to the cold aisle C through the floor outlet 8. An air circulation circuit composed of a flow of cool air (shown by solid line arrows) and an air flow in the server rack S (shown by broken lines) is formed under the blowing pressure of the air supply fan 11. The cooling coil 12 cools the air circulating in the air circulation circuit, and removes heat generated by the server equipment in the server rack S.

  7 and 8 are sectional views showing the structure of the server room 1 provided with the air conditioning system shown in FIGS. 5 and 6.

  The air conditioner 50 is disposed only at a position suitable for improving the temperature distribution in the cold aisle C, the airflow distribution, and the like, and the shielding plate B is disposed between the air conditioners 50 spaced apart from each other. Other configurations are substantially the same as those in the above-described embodiment (FIGS. 2 to 4), and further description is omitted.

  The preferred embodiments and examples of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments and examples, and is within the scope of the present invention described in the claims. It is needless to say that various changes or modifications can be made in the above, and such changes or modifications are also included in the scope of the present invention.

  For example, in the above-described embodiments and examples, an air-cooled heat pump type air conditioner or a cold water circulation type air conditioner is used as an air conditioner directly under a cold aisle. A type air conditioner may be disposed in the underfloor chamber.

  In addition, the present invention is applied to a server room using a server rack of a type that includes a fan on the top surface of the housing and that exhausts heat from the top surface of the housing. For example, an auxiliary air conditioner above the cold aisle The hot exhaust air may be cooled.

  Furthermore, the present invention may be applied to a server room using a server rack of a type that introduces cold air from the bottom, and for example, the cold air of an air conditioner directly below the cold aisle may be supplied to the bottom surface of the server rack.

  Moreover, in the said embodiment and Example, although the air-conditioner right under a cold aisle is arrange | positioned at equal intervals, an air-conditioner is arrange | positioned at irregular intervals, or arrange | positioned contiguously without spacing. Also good.

  The present invention is applied to an air conditioning system for cooling a room in which an electronic device that generates a large amount of sensible heat is arranged in a hot aisle / cold aisle system. The air-conditioning system of the present invention is suitably used as an air-conditioning system for server rooms, data centers, IT equipment management facilities, mobile phone base stations and the like that accommodate a large number or large capacity of IT equipment, computers, communication equipment, etc. obtain. According to the air conditioning system of the present invention, in a room or facility that requires a large amount of cold air circulation to remove a large amount of sensible heat, it is suitable for staged mounting or removal of server equipment or the like, nonuniform indoor heat load distribution, etc. In addition, it is possible to reduce the frequency of work such as maintenance or maintenance / management of the air conditioner in the room, and it is possible to prevent a situation in which the condensed water or condensed water of the cooling coil affects the server device or the like.

DESCRIPTION OF SYMBOLS 1 Server room 2 Floor structure 3 Floor surface component 4 Floor slab 7 Floor inlet 8 Floor outlet 9 Underfloor chamber 10 Air conditioner 11 Air supply fan 12 Cooling coils 13 and 14 Heating medium circulation piping 15 Outdoor unit 17 Cold water supply Pipe 18 Cold water return pipe 20 Truss beam 25 Support stand 27 Support stage 30 External air conditioner 40 Exhaust system 50 Air conditioner 51 Air supply fan 52 Cooling coils 53, 54, 57, 58 Heat medium circulation pipe 55, 59 Heat exchanger 56 Cold water Circulation tank 60 Air outlet B Shield plate C Cold aisle E Shield H Hot aisle S Air-cooled server rack Sa Case front Sb Case back

Claims (5)

In an air conditioning system installed in a room where electronic devices that generate a large amount of sensible heat are placed in a hot aisle / cold aisle system,
Having an air conditioner placed in the underfloor chamber directly under the cold aisle,
The air conditioner includes an air cooling cooler, an air circulation supply fan, and a cold air blowing port.
The cold air blowing port is composed of or connected to a floor air outlet disposed on the floor surface of the cold aisle,
The air supply fan sucks hot air in the hot aisle through a floor suction port arranged on the floor surface of the hot aisle, cools it by the cooler, and blows the cold air upward from the floor air outlet to the cold aisle. Forming an air circulation circuit,
The cold air exchanges heat with the electronic device and flows out into the hot aisle as the warm air.
The said cooler cools the said warm air, and removes the sensible heat of the said electronic device, The air conditioning system characterized by the above-mentioned.   The air conditioner further includes an auxiliary air conditioner disposed on the top of the cold aisle, the auxiliary air conditioner sucks and cools the warm air exchanged with the electronic equipment, and blows the cooled air downward to the cold aisle. The air conditioning system according to claim 1.   The air conditioning system according to claim 2, wherein the air cooling cooler of the auxiliary air conditioner constitutes a vaporizer or an evaporator of a heat medium circuit of a refrigerant natural circulation system.   The air-conditioning system according to any one of claims 1 to 3, wherein the air-cooling cooler of the air conditioner constitutes a vaporizer or an evaporator of a refrigerant natural circulation type heat medium circuit.   2. The air conditioner is supported by a pedestal disposed in the underfloor chamber, and is disposed close to a level of the floor surface of the room and spaced from the floor surface of the underfloor chamber. The air conditioning system of any one of thru | or 4.

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