This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2009-124607, filed on May 22, 2009, the entire contents of which are incorporated herein by reference.
The embodiments discussed herein are related to an air conditioning installation for sending cooled air to a bottom-floor level and then supplying the cooled air to electronic equipment installed on a raised-floor level.
Hitherto, a data center that supplies cold air from a bottom-floor level to electronic equipment through a panel has been utilized. A data center of this type has a double-floor configuration including a bottom-floor level and a raised-floor level and electronic equipment is disposed on the raised-floor level. In a data center configured as mentioned above, electronic equipment mounted on a rack tends to generate more heat in less space, causing heat generated per server rack to increase and hot spots with air exhausted from the electronic equipment and flowing around the rack to occur.
Here, air flows in a data center will be described with reference to
In the case that a flow rate of air exhausted from a rack and sucked into the rack is higher than a predetermined rate, a hot spot is generated with air exhausted from electronic equipment and flowing around the rack. On the other hand, in the case that a flow rate of air blown off from an air conditioner is lower than another predetermined rate, electronic equipment mounted on a lower part of a rack is cooled, but electronic equipment mounted on an upper part of the rack is not cooled for lack of cooled air and hence a hot spot is generated at the upper part of the rack as illustrated in
Here, an example illustrated in
As illustrated in
Therefore, as a method of preventing a hot spot from being generated, there is known a technique for causing a flow rate of air sucked into electronic equipment to be higher than a flow rate of air blown off from an air conditioner. For example, cold air is mixed with exhaust air on a raised-floor level that is the space in contact with a surface of an air conditioner suction port, thereby causing the flow rate of air sucked into the electronic equipment to be higher than the flow rate of air blown off from the air conditioner. Japanese Laid-open Patent Publication No. 08-303815 discloses an example of such technique.
However, the above mentioned technique for increasing the flow rate of air sucked into the electronic equipment has such a problem that, since the cold air is mixed with the exhaust air on the raised-floor level that is the space in contact with the surface of the air conditioner suction port, part of the air blown off from the bottom-floor level toward the raised-floor level is not supplied to the electronic equipment and directly returns to the air conditioner suction port and hence the energy of the air is not effectively utilized.
According to an aspect of the invention, an installation for cooling an electronic device provided on a floor in a room includes an underfloor space below the floor; an air conditioner for sending air to the underfloor space; a first opening provided in the floor and adjacent to the electronic device, for sending air from the underfloor space to the room; and a second opening provided in the floor and adjacent to the air conditioner, the second opening being configured to cause the air pressure of the lower side of the second opening to be lower than the air pressure of the upper side of the second opening.
The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed.
Next, preferred embodiments of an air conditioning installation according to the present invention will be described in detail with reference to the accompanying drawings.
In the following, a configuration of an air conditioning installation according to the embodiment 1 and a flow of processing performed will be described in this order and finally, advantages attained by the embodiment 1 will be described.
[Configuration of Air Conditioning System]
Next, a configuration of an air conditioning installation 100 will be described with reference to
An opening part 10 which is provided separately from the raised-floor opening panel which is disposed adjacent to the electronic equipment in order to supply the cooled air to the electronic equipment is formed in a raised tiled floor 31 which is in contact with a negative pressure area which is an area in the bottom-floor level 1b and on which a negative pressure is exerted relative to a positive pressure on the raised-floor level 1a in order to take exhaust hot air into the bottom-floor level 1b from the raised-floor level 1a.
The air conditioner 20 includes a blower 21 for sending air to the bottom-floor level 1b and an heat exchanger 24 for cooling the hot air which is exhausted from the electronic equipment 40a and operates to send the cooled air down to the bottom-floor level 1b using the blower 21 and supply the cooled air up to the electronic equipment 40a disposed on the raised-floor level 1a through a raised-floor opening panel 50.
Next, detailed configurations of the opening part 10 and the air conditioner 20 will be described with reference to
The air conditioner 20 includes the blower 21, an air conditioner suction port 23 and the heat exchanger 24. The blower 21 is driven using a built-in motor 21a to send the cooled air down to the bottom-floor level 1b through an air conditioner blow-off port.
The heat exchanger 24 cools the exhaust hot air which is exhausted from the electronic equipment 40a and is sucked into the heat exchanger through the air conditioner suction port 23 and makes the blower 21 blow off the cooled air.
Next, a rack cooling operation will be described in detail with reference to
As illustrated in the drawing, the air which has been cooled down to 20° C. using the air conditioner 20 and blown off at the air flow rate of 300 m3/min using the blower is mixed with exhaust hot air which has been taken into the opening part 10 in a heated-up-to-30° C. and decelerated-down-to-20 m3/min state and then the mixed air is blown off toward the raised-floor level at the total air flow rate of 320 m3/min.
That is, in the air conditioning installation 100, although the exhaust hot air from the electronic equipment is taken into the system and hence the average temperature of the cooled air which is mixed with the exhaust hot air in a vacant bottom-floor level is increased, the air flow rate of the cooled air may be increased. As a result, it may become possible to prevent the temperature on a rack air-suction surface from being varied, thereby preventing a hot spot from being generated.
Returning to the description on the configuration in
The raised-floor opening panel 50 is an opening panel which is fitted in the raised tiled floor in the vicinity of the rack 40 in order to supply the cooled air which has been sent down to the bottom-floor level 1b up to the raised-floor level 1a.
Next, results of simulation performed by modeling a data center to which the air conditioning installation 100 according to the embodiment 1 is applied and using a height from a bottom floor, an air flow rate of the air conditioner and an area of a blow-off opening part in the air conditioner as parameters will be described with reference to
As illustrated in
First, as a simulating process, how the value of a maximum vertical distance “d” [m] (hereinafter, referred to as a negative pressure distance) measured from a front surface of the air conditioner is changed within a range of the negative pressure area on which a negative pressure is exerted relative to a positive pressure on the raised-floor level in the case that the parameters (the height from the bottom floor and the air conditioner air flow rate) have been changed has been confirmed.
Results of simulation performed are illustrated in
An example illustrated in
Next, pressure distributions under the raised floor will be described with reference to
In addition, as illustrated in
In addition, negative pressure area may also be caused by the flow rate of the air below the opening part being higher than that above the opening part.
Next, an air flow rate increasing effect which has been clarified from a result of simulation performed by modeling a data center to which the air conditioning installation 100 according to the embodiment 1 is applied such that the raised-floor opening panel 50 is disposed in an area corresponding the raised floor on which a negative pressure is exerted relative to a pressure on a raised-floor level will be described with reference to
As illustrated in
The result of simulation performed on the data center so configured is illustrated in
Specifically, “Grill No.” indicative of the identification number of each grill, “Air Flow” indicative of the air flow rate at which air has been blown off from each grill and “Temperature” indicative of the temperature of each blown-off air are indicated in a one-to-one correspondence.
As illustrated in the example in
As described above, in the air conditioning installation 100 according to the embodiment 1, since the opening part 10 is formed on the level in contact with the negative pressure area in order to take exhaust hot air into the bottom-floor level from the raised-floor level, generation of a hot spot with the exhaust air flowing around a rack, which would occur at an insufficient air flow rate, may be prevented by taking the exhaust hot air into the bottom-floor level from the raised-floor level so as to increase the air flow rate.
Although a case in which the opening is usually opened has been described in the explanation of the embodiment 1, the present invention is not limited thereto and may be embodied to control opening/closing of the opening part.
Therefore, in the embodiment 2 which will be described hereinbelow, a configuration of an air conditioning installation according to the embodiment 2 will be described with reference to
As illustrated in
The air direction and air speed sensor 60 senses the direction of the air passing through the opening part 10 which is configured to be variably opened/closed in order to take exhaust hot air into the space under the raised floor. Then, the air direction and air speed sensor 60 notifies the opening panel control section 70 of a result of sensing.
In the case that it has been sensed that the air is directed from the raised-floor level toward the bottom-floor level, the opening panel control section 70 controls to open the opening part 10 which is configured to be variably opened/closed in order to take the exhaust hot air into the bottom-floor level. While in the case that it has been sensed that the air is directed from the bottom-floor level toward the raised-floor level using the air direction and air speed sensor 60, the opening panel control section 70 controls to close the opening part 10.
As described above, in the embodiment 2, the air conditioning installation 100a senses the direction of the air passing through the opening part 10 using the air direction and air speed sensor 60. Then, in the case that it has been sensed that the air is directed from the raised-floor level toward the bottom-floor level using the air direction and air speed sensor 60, the air conditioning installation 100a controls to pen the opening part 10 which is configured to be variably opened/closed in order to take the exhaust hot air into the bottom-floor level using the opening panel control section 70. While in the case that it has been sensed that the air is directed from the bottom-floor level toward the raised-floor level using the air direction and air speed sensor 60, the air conditioning installation 100a controls to close the opening part 10 using the opening panel control section 70. Therefore, in the case that it has been sensed that the air is directed from the bottom-floor level toward the raised-floor level, the opening part 10 which is configured to be variably opened/closed in order to take the exhaust hot air into the bottom-floor level may be closed to prevent the cooled air from being mixed with the exhaust hot air on the raised-floor level.
Although the embodiments have been described, the present invention is not limited to the above mentioned embodiments and may be embodied in a variety of ways. Thus, in the following, a further embodiment of the present invention will be described as an embodiment 3.
(1) Opening/Closing the Opening Part in Accordance with Pressure Information
In the above mentioned embodiment 2, a case in which the direction of the air passing through the opening part is sensed to control opening/closing of the opening part in accordance with the direction of the air passing through the opening part has been described. However, the embodiment is not limited thereto and the embodiment may be configured to sense bottom-floor-level pressure information (information on pressure exerted on a bottom-floor level) of the opening part is sensed to control opening/closing of the opening part in accordance with the bottom-floor-level pressure information of the opening part.
As described above, according to the embodiment 3, in the case that the bottom-floor-level pressure information of the opening part 10 which is configured to be variably opened/closed in order to take the exhaust hot air into the bottom-floor level and the sensed bottom-floor-level pressure information is of a value less than the predetermined threshold value, the air conditioning installation 100a controls to open the opening part 10. While in the case that the bottom-floor-level pressure information is of a value more than the predetermined threshold value, the system 100a controls to close the opening part 10. Thus, in the case that the bottom-floor-level pressure information is of a value more than the predetermined threshold value, the opening part 10 may be closed to prevent the cooled air from being mixed with the exhaust air on the raised floor level.
A system according to the above embodiments exhibit such an advantage that the hot spot at a rack generated with exhaust air flowing around the rack, which occurs at an insufficient air flow rate, can be efficiently prevented by supplying the exhaust hot air to the bottom-floor level from the raised-floor level to increase the air flow rate.
All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present inventions have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.
Number | Date | Country | Kind |
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2009-124607 | May 2009 | JP | national |