JP5155378B2 - Server room air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system for cooling a server room in which a server is installed throughout the year and maintaining a constant temperature and humidity in the server room.

  In recent years, with the spread of the Internet and computer systems, a large number of servers are installed in server rooms in data centers and enterprises, and the heat generation load from these servers has become very large. Therefore, a dedicated air conditioning system is installed in the server room for the purpose of maintaining the server room in a constant temperature and humidity environment throughout the year in order to ensure stable operation of the server.

  As this type of conventional air conditioning system, generally, as shown in FIG. 6, an air conditioning system that operates the chiller 11 and the air conditioner 16 of the cold heat source with a constant load throughout the year, or low temperature outside air ( There is known an air conditioning system that cools outside air by incorporating OA).

  Furthermore, an air conditioning system using a latent heat cooling method has also been proposed. As an air conditioning system using this method, for example, when a rise in room temperature exceeds a set temperature, a mist from a sprayer installed in an air conditioning supply system in a server room is used. A rack cooling system that cools by spraying (see Patent Document 1), an air conditioning system that performs humidity control by installing a spray nozzle in the room as a humidifying means (see Patent Document 2), or a cooled pure A gas purifier that removes the sensible heat load in the room while spraying water to keep the absolute humidity constant (see Patent Document 3), or air after the air-conditioning return air from the room is mixed with the outside air A system using outside air cooling that humidifies to a temperature is known. Conventionally, as a dew condensation prevention measure in a system using outside air cooling, a technique for heating outside air to a certain temperature using a heater or the like, a technique for heating outside air to a certain temperature by an outside air conditioner or the like (patent document) 4)) is also known.

JP 2009-110469 A JP 2005-61647 A JP 2001-334121 A Japanese Patent Laid-Open No. 11-294832

  However, in the technique described in Patent Document 1 described above, since mist is sprayed in the server room, there is a risk that the humidity may be higher than expected and there is a risk of damaging the server. .

  Further, in the technique described in Patent Document 2 described above, latent heat cooling is performed after passing through the sensible heat cooling device, or latent heat cooling is performed after mixing the air-conditioning return air from the room and the outside air. Therefore, it is necessary to control so that the humidity after passing through the humidifying means does not become too high, and it is necessary to install an outside air conditioner in the outside air system. There was a problem that became complicated.

  Furthermore, in the technique described in the above-mentioned Patent Document 3, since it is necessary to cool water sprayed in order to keep the absolute humidity constant, it is necessary to operate a cooling heat source such as a chiller even in the winter, which saves energy. There was a problem that it was difficult to plan.

  Further, in the above-described conventional outdoor air cooling system, the air conditioning return air from the room and the outside air are mixed and then humidified by the humidifier, so that the humidity after passing through the humidifier is controlled so as not to become too high. There is a problem that the system is complicated and the amount of latent heat cooling per unit air volume is small, so that there is a problem that the equipment becomes large and requires a large installation space for the equipment.

  Furthermore, the above-described conventional anti-condensation measures in the outside air cooling system consume electric power and heat it, so that additional energy is required for heating, which makes it difficult to save energy, and to balance the outside air. Since the humidifier and dehumidifier are provided in the machine, there is a problem that the system becomes complicated.

  The present invention has been made to solve the various problems described above, and an object of the present invention is to provide an air conditioning system for a server room that can save energy and space.

  The present invention is an air conditioning system for cooling a server room in which a server is installed throughout the year and maintaining a constant temperature and humidity in the server room, a cooling source for cooling a medium to be cooled, An air conditioner having a cooling coil to which a medium to be cooled cooled by a source is supplied, an air supply duct for sending air-conditioning air cooled by the cooling coil of the air conditioner to the server room, and the server room A return air main duct for returning the exhaust heat of the server from the server room to the air conditioner, a branch from the return air main duct, and a part of the air return A return air bypass duct, a latent heat cooler provided in the return air bypass duct, and outside air connected to the return air main duct after joining the return air bypass duct downstream of the latent heat cooler The air conditioning return air passing through the return air bypass duct is cooled and humidified by the latent heat cooling action by water evaporation in the latent heat cooler, and has an absolute humidity lower than that of the air conditioning return air After being mixed with the outside air introduced into the outside air introduction duct, it is returned to the cooling coil of the air conditioner.

  In the server room air conditioning system according to the present invention, the latent heat cooler may be configured such that the air-conditioning return air passes through a gas-liquid contact material into which water is dropped.

  The server room air conditioning system according to the present invention further includes a heating unit for heating the outside air taken into the outside air introduction duct, and the heating unit includes the cooling source and the cooling coil of the air conditioner. A heating coil connected to the cooling medium circulation pipe for the heating unit branched from the cooling medium circulation main pipe for circulating the cooling medium between them, and circulating the heating coil The lowered medium to be cooled may be supplied to the cooling coil of the air conditioner, and the medium to be cooled may be supplied to the heating coil by circulating the cooling coil of the air conditioner.

  Furthermore, the air conditioning system for a server room according to the present invention includes another air conditioner that cools the server room, and the other air conditioner includes the cooling medium separately from the cooling medium circulation pipe for the heating unit. A cooling coil to which a cooling medium circulation sub-pipe branched from the circulation main pipe is connected is provided, and the cooling medium whose temperature is lowered by circulating the heating coil is supplied to the cooling coil of the other air conditioner. In addition, the medium to be cooled may be supplied to the heating coil by circulating the cooling coil of the other air conditioner.

  According to the present invention, various excellent effects can be obtained, such as energy saving and space saving of equipment.

It is a block diagram which shows the air conditioning system of the server room which concerns on the 1st Embodiment of this invention. It is an air line figure showing operation of an air conditioning system of a server room concerning a 1st embodiment of the present invention. It is a block diagram which shows the air conditioning system of the server room which concerns on the 2nd Embodiment of this invention. It is an air line figure showing operation of an air conditioning system of a server room concerning a 2nd embodiment of the present invention. It is a block diagram which shows the modification of the air conditioning system of the server room which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the conventional general air conditioning system. It is a block diagram which shows the conventional general external air cooling system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, an air conditioning system for a server room according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, an air conditioning system 10 according to the present embodiment includes a chiller 11 as a cooling heat source for cooling water that is a medium to be cooled, and water cooled by the chiller 11 is circulated in cold water. An air conditioner 16 having a cooling coil 14 and a blower 15 supplied via the main pipe 12, and an air supply duct 18 for sending the air-conditioning air cooled by the cooling coil 14 of the air conditioner 16 to the server room 17; In the server room 17, the air conditioning return air that has recovered the exhaust heat of the server is returned from the server room 17 to the air conditioner 16, and one of the air conditioning return air branches off from the return air main duct 19. A return air bypass duct 20 that passes through a portion, a latent heat cooler 21 provided in the middle of the return air bypass duct 20, and after joining the return air bypass duct 20 on the downstream side of the latent heat cooler 21 And outside air introducing duct 22 which is connected to the gas main duct 19 is configured to include an exhaust duct 23 connected to the return air main duct 19, a.

  The chilled water circulation main pipe 12 has a chilled water outgoing pipe 12a for sending chilled water from the chiller 11 to the cooling coil 14 of the air conditioner 16, and a chilled water from the cooling coil 14 of the air conditioner 16 to the chiller. A cold water return pipe 12b, and a cold water circulation pump 24 is connected to the cold water outgoing pipe 12a.

  A first return air volume adjustment damper 25 is connected to the return air main duct 19 on the downstream side in the vicinity of the branch point of the return air bypass duct 20, and the return air bypass duct 20 is connected to the downstream side of the latent heat cooler 21. 2 A return air volume adjustment damper 26 is connected. The outside air introduction duct 22 is connected to an outside air volume adjusting damper 27 in the vicinity of the junction with the return air bypass duct 20, and an exhaust fan 28 is connected to the exhaust duct 23.

  The latent heat cooler 21 is a vaporization type configured such that the air-conditioning return air passes through a gas-liquid contact material to which water supplied through a water supply pipe 30 is dropped by being pumped to a water supply pump 29. For example, the gas-liquid contact material described in JP 2010-201366 A may be used. The sheet serving as the base material of the structure constituting the gas-liquid contact material is a water-absorbent sheet, the water-absorbent sheet is composed of fibers such as nonwoven fabric, and the fibers do not inhibit hydrophilicity. There is no particular limitation as long as it is suitable for fold folding when processed into a nonwoven fabric.

  Next, operation | movement of the air conditioning system 10 which concerns on this Embodiment provided with the above-mentioned structure is demonstrated.

  The air-conditioning supply air (SA) cooled to a predetermined temperature through the cooling coil 14 supplied with cold water by the chiller 11 is pumped by the blower 15 and blown out into the server room 17 through the air supply duct 18. The

  In the server room 17, the air-conditioning supply air (SA) recovers exhaust heat from the server and then becomes air-conditioning return air (RA) in the state of (1) in FIG. 2, and a part thereof (from an outside air introduction duct 22 described later). The air volume corresponding to the air volume (OA) taken in is exhausted to the outside through the exhaust duct 23 by the exhaust fan 28 as exhaust (EA).

  The other air-conditioning return air (RA) that has not been exhausted passes through the return air main duct 19, and the air-conditioning return air (RA- 1) having a predetermined air volume therein is branched into the return air bypass duct 20. 2 is cooled to a predetermined temperature (dew point temperature) and humidified to a predetermined absolute humidity by a latent heat cooling action by evaporation of water supplied through the water supply pipe 30 in the latent heat cooler 21, and is in a state of (2) in FIG. It becomes air-conditioning return air (RA-1).

  Next, the air-conditioning return air (RA-1) is mixed with the outside air (OA) in the state of (3) in FIG. 2 taken in through the outside air introduction duct 22, and the air conditioning in the state of (4) in FIG. Return air (mixed-1).

  At this time, only when the absolute humidity of the outside air (OA) is lower than the air-conditioning return air (RA), the outside air volume adjustment damper 27 is opened, and the air-conditioning return air (RA-1) is mixed with the outside air (OA). In this case, the outside air volume adjustment damper 27 is closed and the air-conditioning return air (RA-1) is controlled not to be mixed with the outside air (OA).

  At this time, the air-conditioning return air (RA−) is adjusted so that the absolute humidity of the air-conditioning return air (mixed-1) after being mixed with the outside air (OA) matches the predetermined absolute humidity of the air-conditioning air supply (SA). 1) The air volume ratio between the outside air (OA) and the latent heat cooling amount in the latent heat cooler 21 are determined, and the opening degree of the second return air volume adjusting damper 26 and the outside air volume adjusting damper 27 and the latent heat cooler 21 are controlled. .

  Thereafter, the air-conditioning return air (mixing-1) is mixed with the air-conditioning return air (RA-2) that has passed through the return air main duct 19 without being branched to the return air bypass duct 20, and is shown in FIG. It becomes air-conditioning return air (mixing-2) of the state. The air-conditioning return air (mixed-2) is returned to the air conditioner 16 and cooled to a predetermined temperature in the cooling coil 14 to become the air-conditioning air supply (SA) in the state of (6) in FIG.

  Thereafter, the above operation is repeated, and the inside of the server room 17 is maintained in a constant temperature and humidity environment throughout the year.

  When the temperature / humidity of the outside air (OA) satisfies the temperature / humidity condition of the air-conditioning supply air just by mixing the outside air (OA) with the air-conditioning return air (RA), the latent heat cooler 21 is operated. It is also possible to operate only with outside air cooling.

  Thus, according to the server room air conditioning system 10 according to the present embodiment described above, since the latent heat cooler 21 is installed in the air conditioning return air (RA) system of high temperature and low humidity air, the latent heat cooling per passing air volume is performed. While the amount can be increased, the latent heat cooler 21 can be downsized. Therefore, cost reduction and space saving of equipment can be achieved. Moreover, since the saturation efficiency becomes 95% by using the gas-liquid contact material for the latent heat cooler 21, the amount of humidification can be easily adjusted by controlling the air flow rate, thereby improving the controllability. Can do. Furthermore, by using the vaporization type latent heat cooler 21, the latent heat cooling can be performed more efficiently than other methods, the loss of water supply amount can be minimized, and the energy saving effect can be further enhanced. .

  In addition, because the air-conditioning return air with small temperature and humidity fluctuations is cooled to the dew point, the control is easy and controllability can be improved. In addition, the air-conditioning return air (RA) system with high temperature and low humidity air has latent heat. Since cooling is performed, the loss of water supply amount is small and the efficiency can be increased.

  Furthermore, when the outside air (OA) is low temperature and low humidity in winter, etc., the operation of the chiller 11 itself becomes unnecessary, and further energy saving can be achieved.

  Hereinafter, the air conditioning system 10 according to the present embodiment is compared with the conventional general air conditioning system 1 shown in FIG. 6 and the conventional general outside air cooling system 2 shown in FIG. The energy saving effect of the air conditioning system 10 is examined.

Here, the general air conditioning system 1 in FIG. 6 performs a general air conditioning operation in which only the conditioned air (SA, RA) is circulated between the air conditioner 16 and the server room 17 and no outside air (OA) is introduced. The outside air cooling system of FIG. 7 mixes the air-conditioning return air (RA) and outside air (OA) during a period in which the outside air cooling can be used, performs outside air cooling operation without humidification, and air-conditioning air during a period when the outside air cooling cannot be used. It is assumed that a general air-conditioning operation is performed without circulating outside air only by circulating (SA, RA). In the following description, in FIG. 6 and FIG. 7, the same components as those of the air conditioning system 10 according to the present embodiment are denoted by the same reference numerals as those in FIG.
(1) Determination of the operation model of each air conditioning system First, based on the outdoor air condition distribution data for one year in Tokyo (2009), the outside air cooling system 2 and the air conditioning system 10 according to the present embodiment perform the outside air cooling. The usable period, the period in which the air conditioning system 10 according to the present embodiment can use latent heat cooling, and the other general air conditioning period are determined.

  The period during which the outside air cooling can be used is a temperature of 27 ° C. or less and a dew point temperature of 5.5 ° C. to 15 ° C. (indoor conditions according to ASHRAE: temperature 18 to 27 ° C., humidity 5.5 to 15 ° C. DP and 60% or less). If the period is within the range, it will be 2,600 hours / year.

  In addition, the period in which the latent heat cooling can be used is a temperature of 17.5 ° C. or less and a dew point temperature of less than 5.5 ° C., an air conditioning supply air (SA) of 18 ° C., 60%, an air conditioning return air (RA) of 28 ° C. When the air conditioning return air (RA-1) after passing through the latent heat cooler 21 is set to 17.55 ° C. and 94.9% and the outside air OA) is less than 5.5 ° C. DP, the outside air When (OA) and air-conditioning return air (RA-1 and RA) are mixed to select a temperature / humidity condition for air-conditioning air supply, 3,197 hours / year is obtained.

  Furthermore, the general air conditioning period is 2,963 hours / year, excluding the period in which the outside air cooling can be used and the period in which the latent heat cooling can be used.

As described above, when the operation model of each air conditioning system 1, 2, 10 is determined, in the general air conditioning system 1, the general air conditioning operation is 8,760 hours / year, and in the outside air cooling system 2, the outside air cooling operation is 2,600. In the air conditioning system 10 according to this embodiment, the general air conditioning operation is 6,160 hours / year in time, the outside air cooling operation is 2,600 hours, the latent heat cooling operation is 3,197 hours, and the general air conditioning operation is 3,197 hours. / Year.
(2) Setting of trial calculation conditions for energy saving effect For simple study, the area of the server room 17 is 100 m ² , the load of the server in the server room 17 is 150 kw (1.5 kw / m ² ), and the air conditioning supply air ( It is assumed that the air volume of SA) is about 45,000 m ³ / h, and efficient air conditioning is performed in the server room 17.

In addition, as equipment power, the air conditioner 16 is 20 kw × 3 units (including the power of the outdoor unit and the blower 15), the power of the blower 15 of the air conditioner 16 is 7.5 kw, and the power of the blower of the outdoor unit of the air conditioner 16 Is 7.5 kw, the power of the feed water pump 29 of the latent heat cooler 21 is 0.4 kw, the power during the general air conditioning operation is 60 kw (for 16 × 3 air conditioners), and the power during the outside air cooling operation is It is assumed that the power during the latent heat cooling operation is 15.4 kW (the air blower inside and outside the air conditioner 16 and the water supply pump 29 minutes).
(3) Trial calculation result of energy saving effect Based on the operation model and trial calculation condition of each air conditioning system described above, when calculating the annual power consumption in each air conditioning system, in the general air conditioning system 1,
60kw × 8,760h = 525.6MWh
In the outside air cooling system 2,
60kw × 6,160h + 15kw × 2,600h = 408.6Mwh
Thus, the air conditioning energy can be reduced by about 22% compared to the general air conditioning system 2.

And in the air-conditioning system 10 which concerns on this Embodiment,
60kw × 2,963h + 15kw × 2,600h + 15.4kw × 3,197h
= 266.0 Mwh
Thus, the air conditioning energy can be reduced by about 50% compared to the general air conditioning system 1.

Also, assuming that the electricity rate is 15 yen / kwh and the water supply rate is 200 yen / m ³ , these trial calculation results are converted into annual running costs. / Year, 612.9 million yen / year for the outside air cooling system 2 and 405,000 yen / year for the air conditioning system 1 according to the present embodiment. The air conditioning system 10 according to the present embodiment Compared with a typical air conditioning system 1, the cost can be reduced by about 40% per year.

  Next, an air conditioning system for a server room according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. In the following description, for simplification of description, the same configuration as that of the air conditioning system 10 according to the first embodiment of the present invention described above in FIGS. The same reference numerals are used and detailed description thereof is omitted.

  As shown in FIG. 3, the air conditioning system 30 according to the present embodiment is further provided with a heating unit 31 in addition to the configuration of the air conditioning system 10 according to the first embodiment of the present invention described above. It is installed and configured in the middle of the duct 22.

  The heating unit 31 is provided with a heating coil 32, and a heating unit chilled water circulation pipe 33 is connected to the heating coil 32. The chilled water circulation pipe 33 for the heating unit includes a chilled water outlet pipe 33a branched from the chilled water return pipe 12b of the chilled water circulation main pipe 12 via the three-way valve 34a, and a chilled water outlet pipe 12a of the chilled water circulation main pipe 12 to the three-way valve. And a cold water return pipe 33b branched through 34b.

  Next, operation | movement of the air conditioning system 30 which concerns on this Embodiment provided with such a structure is demonstrated.

  The air-conditioning air supply (SA) cooled to a predetermined temperature through the cooling coil 14 of the air conditioner 16 is pumped by the blower 15 and blown out into the server room 17 through the air supply duct 18.

  In the server room 17, the air-conditioning supply air (SA) recovers exhaust heat from the server and then becomes air-conditioning return air (RA) in the state of (1) in FIG. 4, and a part thereof (from an outside air introduction duct 22 described later). The air volume corresponding to the air volume (OA) taken in is exhausted to the outside through the exhaust duct 23 by the exhaust fan 28 as exhaust (EA).

  The other air-conditioning return air (RA) that has not been exhausted passes through the return air main duct 19, and the air-conditioning return air (RA- 1) having a predetermined air volume therein is branched into the return air bypass duct 20. 4 is cooled to a predetermined temperature (dew point temperature) and humidified to a predetermined absolute humidity by the latent heat cooling action by evaporation of water supplied through the water supply pipe 30 in the latent heat cooler 21, and is in a state of (2) in FIG. It becomes air-conditioning return air (RA-1).

  On the other hand, when the outside air (OA) in the state of (3) of FIG. 4 taken through the outside air introduction duct 22 is very low temperature, it passes through the heating coil 32 of the heating unit 31 and reaches a predetermined temperature. To the outside air in the state of (4) in FIG. 4 (warming OA). At this time, the chilled water (for example, 7 ° C.) whose temperature has been lowered by heating the outside air (OA) on the heating unit 31 side passes through the chilled water circulation main pipe 12 through the chilled water return pipe 33b and the three-way valve 34b. It merges with cold water (for example, 7 ° C.) in the pipe 12 a and is used as a heat source for cooling the air conditioning supply air (SA) in the cooling coil 14 of the air conditioner 16.

  Further, the chilled water (for example, 12 ° C.) whose temperature has been increased by cooling the air-conditioning air supply (SA) in the cooling coil 14 of the air conditioner 16 is circulated in the chilled water for the heating unit via the chilled water return pipe 12b and the three-way valve 34a. Branched to the cold water outlet pipe 33 a of the pipe 33 and used as a heat source for heating the outside air (OA) in the heating coil 32 of the heating unit 31.

  Next, the outside air (warming OA) thus heated is mixed with the air-conditioning return air (RA-1) that has passed through the latent heat cooler 21, and the air-conditioning return air (5) in FIG. Mix-1).

  At this time, only when the absolute humidity of the outside air (OA) is lower than the air-conditioning return air (RA), the outside air volume adjustment damper 27 is opened, and the air-conditioning return air (RA-1) is mixed with the outside air (OA). In this case, the outside air volume adjustment damper 27 is closed and the air-conditioning return air (RA-1) is controlled not to be mixed with the outside air (OA).

  At this time, the air-conditioning return air (RA−) is adjusted so that the absolute humidity of the air-conditioning return air (mixed-1) after being mixed with the outside air (OA) matches the predetermined absolute humidity of the air-conditioning air supply (SA). 1) The air volume ratio between the outside air (OA), the heating amount by the heating unit 31 and the latent heat cooling amount in the latent heat cooler 21 are determined, and the opening degrees of the second return air volume adjusting damper 26 and the outside air volume adjusting damper 27 are determined. The heating unit 31 and the latent heat cooler 21 are controlled.

  Thereafter, the air-conditioning return air (mixing-1) is mixed with the air-conditioning return air (RA-2) that has passed through the return air main duct 19 without being branched to the return air bypass duct 20, and is shown in FIG. It becomes air-conditioning return air (mixing-2) of the state. Then, the air-conditioning return air (mixed-2) is returned to the air conditioner 16 and cooled to a predetermined temperature in the cooling coil 14 to become the air-conditioning air supply (SA) in the state of (7) in FIG.

  Thereafter, the above operation is repeated, and the inside of the server room 17 is maintained in a constant temperature and humidity environment throughout the year.

  When the temperature / humidity of the outside air (OA) satisfies the temperature / humidity condition of the air-conditioning supply air just by mixing the outside air (OA) with the air-conditioning return air (RA), the latent heat cooler 21 is operated. It is also possible to operate only with outside air cooling.

  Thus, according to the server room air conditioning system 30 according to the present embodiment described above, in addition to the effects of the air conditioning system 10 according to the first embodiment of the present invention described above, the following excellent effects are further provided. Can be obtained.

  That is, according to the air conditioning system 30 of the server room according to the present embodiment, after the outside air (OA) is heated by the heating unit 31, it is mixed with the air conditioning return air (RA-1) that has passed through the latent heat cooler 21. Therefore, even when the outside air (OA) is very low in a cold region or the like, the occurrence of condensation can be suppressed.

  Moreover, while using the exhaust heat of the air conditioning machine 16 as a heat source of the heating unit 31, the exhaust heat (cold heat) of the heating unit 31 is used as the cold heat source of the air conditioner 16 (the cold heat extracted from the outside air is used). Therefore, the temperature can be adjusted without the need for a dew condensation prevention heater, etc., so that energy can be used without waste, and energy saving can be promoted. Can do.

  In addition, the air conditioning system 30 according to the second embodiment of the present invention described above, for example, as shown in FIG. 5, uses another heat that cools the inside of the server room 17 with the exhaust heat (cold heat) of the heating unit 31. It can also be used as a cold heat source for the air conditioner 35. In this case, a chilled water circulation sub-pipe 36 is connected to another air conditioner 35, and this chilled water circulation sub-pipe 36 is branched from the chilled water return pipe 12 a of the chilled water circulation main pipe 12 via the three-way valve 37. The pipe 36a and the cold water return pipe 36b branched from the cold water return pipe 12b of the cold water circulation main pipe 12 are configured.

  In the above description of each embodiment of the present invention, the term “duct”, such as the air supply duct 18 and the return air main duct 19, is used. It also includes an underfloor chamber or ceiling chamber that uses the interior as a flow path for air-conditioning air supply or air-conditioning atmosphere.

  In addition, since the description of each embodiment of the present invention described above describes a preferred embodiment in the server room air conditioning system according to the present invention, various technically preferable limitations are attached. However, the technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention. Furthermore, the components in the embodiment of the present invention described above can be appropriately replaced with existing components and the like, and various variations including combinations with other existing components are possible. The description of the embodiment of the present invention described above does not limit the contents of the invention described in the claims.

10 Air conditioning system 11 Chiller (cooling heat source)
12 Chilled water circulation main piping (cooled medium circulation main piping)
DESCRIPTION OF SYMBOLS 14 Cooling coil 16 Air conditioner 17 Server room 18 Supply air duct 19 Return air main duct 20 Return air bypass duct 21 Latent heat cooler 22 Outside air introduction duct 30 Air conditioning system 31 Heating unit 32 Heating coil 33 Cooling water circulation piping for heating unit (Cooled medium circulation pipe for heating unit)
35 Another air conditioner 36 Chilled water circulation subpipe (cooled medium circulation subpipe)

Claims (4)

An air conditioning system for cooling a server room in which a server is installed throughout the year and maintaining a constant temperature and humidity in the server room,
A cooling source for cooling the medium to be cooled;
An air conditioner having a cooling coil to which a medium to be cooled cooled by the cold heat source is supplied;
An air supply duct for sending air-conditioning air cooled by a cooling coil of the air conditioner to the server room;
A return air main duct for returning the air-conditioning return air that has recovered the exhaust heat of the server in the server room from the server room to the air conditioner;
A return air bypass duct that branches off from the return air main duct and passes a part of the air-conditioning return air;
A latent heat cooler provided in the return air bypass duct;
An outside air introduction duct connected to the return air main duct after joining the return air bypass duct downstream of the latent heat cooler;
With
The air-conditioning return air passing through the return air bypass duct is cooled and humidified by the latent heat cooling action by water evaporation in the latent heat cooler, and is taken into the outside air introduction duct having an absolute humidity lower than that of the air-conditioning return air. After being mixed with the outside air, the air conditioning system of the server room is returned to the cooling coil of the air conditioner.   2. The server room air conditioning system according to claim 1, wherein the latent heat cooler is configured such that the air-conditioning return air passes through a gas-liquid contact material into which water is dropped.   A heating unit for heating the outside air taken into the outside air introduction duct, and the heating unit circulates the cooling medium between the cooling source and a cooling coil of the air conditioner; A heating coil connected to a cooling medium circulation pipe for a heating unit branched from the circulation main pipe is connected, and the cooling medium whose temperature is lowered by circulating the heating coil is supplied to the cooling coil of the air conditioner. The server room air conditioning system according to claim 1 or 2, wherein the medium to be cooled is supplied to the heating coil while circulating the cooling coil of the air conditioner. Another air conditioner for cooling the server room is provided, and the other air conditioner is a cooling medium circulation sub-pipe branched from the cooling medium circulation main pipe separately from the cooling medium circulation pipe for the heating unit. Is supplied to the cooling coil of the other air conditioner and circulates through the cooling coil of the other air conditioner. 4. The air conditioning system for a server room according to claim 3, wherein the medium to be cooled whose temperature is increased is supplied to the heating coil.

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