JP2015113989A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system capable of reducing an operation cost.SOLUTION: An air conditioning system 1 includes: an air conditioner 20 including a heat exchanger 24 for performing heat exchange between an indoor side space 22A and an outdoor side space 22B; a mixing chamber 30 for communicating with the indoor side space 22A; a ventilation chamber 40 for communicating with the outdoor side space 22B; a first air return duct 60 for leading to the mixing chamber 30 from a server room 10; a suction port 34 and an outside air intake chamber 50 for leading to the mixing chamber 30 through a dust removal filter 51 from the outside; an air outlet 25 for leading to the server room 10 from the indoor side space 22A; a second air return duct 61 for leading to the indoor side space 22A from the server room 10; a suction port 33 for leading to the ventilation chamber 40 from the outside; and a second exhaust duct 63 for leading to the outside from the outdoor side space 22B.

Description

  The present invention relates to an air conditioning system for air conditioning a room.

Conventionally, in a building such as a data center that accommodates a large number of servers, the amount of heat generated by the servers is large. Therefore, it is necessary to perform cooling throughout the year.
Therefore, a direct outside air cooling type air conditioning system that directly introduces outside air into the room has been proposed. According to this direct outside air cooling type air conditioning system, when the temperature and humidity conditions of the outside air are good, it is not necessary to drive the heat source device, so that the operating cost can be reduced.

  However, in practice, the period during which the outside air can be directly cooled is shortened. The reason is that in Japan, there are many time periods when the humidity is high, and when outside air containing moisture is introduced indoors, the temperature and humidity required for indoor air-conditioned air cannot be satisfied.

In order to solve this problem, for example, an indirect outdoor air cooling type air conditioning system that takes in outside air and exchanges heat between the taken-in outside air and room air has been proposed (see Patent Document 1).
According to such an air conditioning system, since outside air containing dust, salt, moisture, and the like does not flow into the room, contamination of room air and an increase in humidity can be suppressed.

JP 2012-117737 A

  However, in the air conditioning system described above, heat exchange is indirectly performed by a heat exchanger, but the heat exchange efficiency of the heat exchanger is not 100%. Therefore, a loss occurs in the use of cold air from the outside air.

  An object of this invention is to provide the air conditioning system which can reduce an operating cost, satisfy | filling the temperature and humidity requested | required of conditioned air.

  An air conditioning system (for example, an air conditioning system 1 described later) according to claim 1 is an air conditioning system that performs air conditioning of a room (for example, a server room 10 described later), and is an indoor space (for example, an indoor space described later). 22A), an outdoor space (for example, an outdoor space 22B described later), and a heat exchanger (for example, a heat exchanger 24 described later) for exchanging heat between the indoor space and the outdoor space. An air conditioner (for example, an air conditioner 20 described later), a mixing chamber (for example, a mixing chamber 30 described later) communicating with the indoor space, and a ventilation chamber (for example, a ventilation chamber described later) communicating with the outdoor space. 40), a first return air passage (for example, a first return air duct 60 and a ventilation chamber 40, which will be described later) from the chamber to the mixing chamber, and a filter (for example, a dust filter 51 which will be described later) from the outside. A first air supply passage (for example, a suction port 34 and an outside air intake chamber 50, which will be described later) reaching the mixing chamber, and a discharge passage (for example, a later-described outlet 25) which extends from the indoor space to the chamber. , A second return air flow path (for example, a first return air duct 60 and a second return air duct 61 described later) from the room to the indoor space, and a second supply air flow path (for example, from the outside to the ventilation chamber) , A suction port 33 (to be described later, a mixing chamber 30), and an exhaust passage (for example, a second exhaust duct 63 to be described later) extending from the outdoor space to the outside.

  The air conditioning system according to claim 2, wherein the first return air flow path extends from the chamber through the ventilation chamber to the mixing chamber, and the second air supply flow path connects the mixing chamber from the outside. Through to the ventilation chamber.

According to the present invention, according to the outside air conditions such as temperature and humidity, the outside air is mixed with the room air to perform the air conditioning directly, and the indirect outside air cooling operation is performed to exchange heat between the outside air and the room air. Can be switched.
For example, when the temperature of the outside air is lower than the temperature of the room air and the humidity is sufficiently low, and the temperature of the room air is desired to be lowered, the outside air cooling operation is directly performed. For example, the outside air conditions that allow direct outside air cooling are an air temperature of 10 ° C. to 26 ° C. and an absolute humidity of 0.006 kg / kg DA to 0.015 kg / kg DA.
On the other hand, when the temperature and humidity of the outside air are high, indirect outside air cooling operation is performed.

  When performing direct outside air cooling operation, indoor air is sucked and taken into the mixing chamber through the first return air flow path, and outside air is taken into the mixing chamber through the first air supply flow path. Then, in the mixing chamber, the indoor air and the outside air are mixed, and the mixed and conditioned air is blown out into the room through the mixing chamber, the indoor space, and the blowout flow path.

  On the other hand, when performing an indirect outdoor air cooling operation, indoor air is sucked and taken into the indoor space through the second return air flow path, and outside air is taken into the outdoor space through the second air supply flow path. Then, heat is exchanged between the indoor space and the outdoor space, air in the indoor space is air-conditioned, and the conditioned air is blown out into the room through the blow-out channel. On the other hand, the air in the outdoor space is discharged to the outside through the exhaust passage.

In this way, when the outdoor air cooling operation is performed directly, the heat consumption is not passed, so that power consumption for the cooling operation can be suppressed. On the other hand, when the indirect outside air cooling operation is performed, only the cold air of the outside air is used and the outside air is not introduced into the room, so that the influence on the air quality and humidity of the room air can be prevented.
Therefore, by switching between direct outside air cooling operation and indirect outside air cooling operation according to the outside air conditions, the operation cost is reduced while satisfying the temperature and humidity required for the conditioned air by making the most of the outside air heat. it can.

It is a mimetic diagram showing the composition of the air-conditioning system concerning one embodiment of the present invention. It is a schematic diagram which shows the operation | movement in the direct outdoor air cooling driving | operation of the air conditioning system which concerns on the said embodiment. It is a schematic diagram which shows the operation | movement in the indirect outdoor air cooling driving | running of the air conditioning system which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Drawing 1 is a mimetic diagram showing composition of air-conditioning system 1 concerning one embodiment of the present invention.
The air conditioning system 1 air-conditions a server room 10 in which servers are accommodated.
The air conditioning system 1 includes an air conditioner 20, a mixing chamber 30, a ventilation chamber 40, an outside air intake chamber 50, and ducts 60, 61, 62, and 63.

The air conditioner 20 exchanges heat between the box-shaped housing 21, the partition plate 23 that partitions the housing 21 into the indoor space 22A and the outdoor space 22B, and the indoor space 22A and the outdoor space 22B. A heat exchanger 24 for performing
The air conditioner 20 is provided with an outlet 25 extending from the indoor space 22A to the server room 10.

  The mixing chamber 30 has a box shape and communicates with the indoor space 22 </ b> A of the air conditioner 20. An opening / closing valve 31 is provided between the mixing chamber 30 and the indoor space 22 </ b> A of the air conditioner 20.

  The mixing chamber 30 is provided with suction ports 33 and 34. Among these, the suction inlet 33 faces the outside, and an on-off valve 35 is provided. On the other hand, the suction port 34 faces the outside air intake chamber 50 and is provided with an on-off valve 36.

  The ventilation chamber 40 is box-shaped and communicates with the outdoor space 22B of the air conditioner 20. The mixing chamber 30 and the ventilation chamber 40 are provided in contact with each other, and an open / close valve 41 is provided between the mixing chamber 30 and the ventilation chamber 40.

  The outside air intake chamber 50 communicates with the suction port 34 of the mixing chamber 30 and is provided with a dust removal filter 51.

  The ducts 60 to 63 include a first return air duct 60 that extends from the server room 10 to the ventilation chamber 40, and a second return air duct 61 that branches from the first return air duct 60 and reaches the indoor space 22 </ b> A of the air conditioner 20. And a first exhaust duct 62 branched from the first return air duct 60 to the outside, and a second exhaust duct 63 extending from the outdoor space 22B to the outside.

An opening / closing valve 64 is provided at a connection portion between the first return air duct 60 and the ventilation chamber 40.
An opening / closing valve 65 is provided at a portion where the second return air duct 61 is connected to the air conditioner 20.
An opening / closing valve 66 is provided at a portion where the second exhaust duct 63 is connected to the air conditioner 20.
A blower 67 is provided in the first exhaust duct 62.

The air conditioning system 1 described above selects the direct outside air cooling operation or the indirect outside air cooling operation according to the outside air conditions such as temperature and humidity.
The air conditioning system 1 opens the on-off valves 31, 36, 41, 64, closes the on-off valves 35, 65, 66, and drives the blower 67 when directly performing the outside air cooling operation.

Then, as shown in FIG. 2, the air in the server room 10 is sucked into the first return air duct 60, and a part of the air is taken into the mixing chamber 30 through the ventilation chamber 40. On the other hand, the remaining air is discharged to the outside through the first exhaust duct 62.
External air is taken in from the outside air intake chamber 50, and dust is removed by the dust removal filter 51. Then, the air in the outside air intake chamber 50 flows into the mixing chamber 30 through the suction port 34. In the mixing chamber 30, the indoor air and the outside air are mixed and air-conditioned, and the air-conditioned air is blown out into the server room 10 through the indoor space 22 </ b> A and the air outlet 25. .

  Further, when performing the indirect outdoor air cooling operation, the air conditioning system 1 opens the on-off valves 35, 41, 65, 66, closes the on-off valves 31, 36, 64, and drives the blower 67 and the heat exchanger 24. .

Then, as shown in FIG. 3, the air in the server room 10 is sucked into the first return air duct 60, and a part of the air passes through the second return air duct 61 and is taken into the indoor space 22 </ b> A. . On the other hand, the remaining air is discharged to the outside through the first exhaust duct 62.
Further, outside air passes through the suction port 33 and the mixing chamber 30 and is taken into the ventilation chamber 40 and flows into the outdoor space 22B.
The heat exchanger 24 exchanges heat between the air in the indoor space 22A and the air in the outdoor space 22B to air-condition the air in the indoor space 22A.
The air in the air-conditioned indoor space 22A is blown out into the server room 10 through the air outlet 25. On the other hand, the air in the outdoor space 22B passes through the second exhaust duct 63 and is discharged to the outside.

According to this embodiment, there are the following effects.
(1) Switching between a direct outside air cooling operation in which the outside air is mixed with room air and air-conditioning, and an indirect outside air cooling operation in which heat is exchanged between the outside air and the room air, according to outside air conditions such as temperature and humidity.
For example, when the temperature of the outside air is lower than the temperature of the room air and the humidity is sufficiently low, and the temperature of the room air is desired to be lowered, the outside air cooling operation is directly performed. On the other hand, when the temperature and humidity of the outside air are high, indirect outside air cooling operation is performed.

When the outside air cooling operation is performed directly, the power consumption for the cooling operation can be suppressed because the heat exchanger 24 is not interposed. On the other hand, when the indirect outside air cooling operation is performed, only the cold air of the outside air is used and the outside air is not introduced into the room, so that the influence on the air quality and humidity of the room air can be prevented.
Therefore, by switching between the direct outside air cooling operation and the indirect outside air cooling operation according to the outside air condition, it is possible to reduce the cooling operation cost by making the most of the cold air of the outside air.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

DESCRIPTION OF SYMBOLS 1 ... Air conditioning system 10 ... Server room 20 ... Air conditioner 21 ... Housing | casing 22A ... Indoor side space 22B ... Outdoor side space 23 ... Partition plate 24 ... Heat exchanger 25 ... Outlet (blower flow path)
30 ... Mixing chamber 31 ... Open / close valve 33 ... Suction port (second air supply passage)
34 ... Suction port (first air supply passage)
35 ... Open / close valve 36 ... Open / close valve 40 ... Ventilation chamber 41 ... Open / close valve 50 ... Outside air intake chamber (first air supply passage)
51 ... Dust filter 60 ... 1st return air duct (1st return air flow path, 2nd return air flow path)
61 ... Second return air duct (second return air flow path)
62 ... 1st exhaust duct 63 ... 2nd exhaust duct (exhaust flow path)
64 ... Open / close valve 65 ... Open / close valve 66 ... Open / close valve 67 ... Blower

Claims (2)

An air conditioning system for air conditioning a room,
An air conditioner including an indoor space, an outdoor space, and a heat exchanger that exchanges heat between the indoor space and the outdoor space;
A mixing chamber communicating with the indoor space;
A ventilation chamber communicating with the outdoor space;
A first return air flow path from the chamber to the mixing chamber;
A first air supply flow path from the outside to the mixing chamber through a filter;
A blowout flow path from the indoor space to the chamber;
A second return air flow path from the chamber to the indoor space;
A second air supply flow path from the outside to the ventilation chamber;
An air conditioning system comprising: an exhaust passage extending from the outdoor space to the outside. The first return air flow path leads from the chamber through the ventilation chamber to the mixing chamber,
2. The air conditioning system according to claim 1, wherein the second air supply channel extends from the outside to the ventilation chamber through the mixing chamber.

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