JP6758280B2 - Air-conditioning indoor unit for computer room - Google Patents

Description

The present invention relates to an air conditioner indoor unit for a computer room, and more particularly to an arrangement of a heat exchanger (evaporator).

For the indoor unit arranged in the conventional computer room, it is necessary to provide a machine room in which a compressor or the like is arranged. Therefore, due to the limitation of the internal space of the indoor unit, it is necessary to arrange the heat exchanger (evaporator) diagonally (see, for example, Patent Document 1). When the heat exchanger is placed at an angle, the dew that is generated from the heat exchanger does not fall into the main drain pan. Therefore, in order to prevent the dewdrop generated from the heat exchanger from leaking, it was necessary to install a sub-drain pan on the leeward side of the heat exchanger. However, there is a problem that the sub-drain pan blocks the air passage, the input of the indoor blower becomes large, and energy-saving operation cannot be performed.

Further, as a heat exchanger (evaporator) of the indoor unit arranged in the computer room, in order to increase the heat exchangeable area, the first heat exchanger and the second heat exchanger, that is, two heats. The one in which the exchanger is arranged has been proposed (see, for example, Patent Document 2). In this heat exchanger, the first heat exchanger is arranged diagonally. The second heat exchanger is shorter than the first heat exchanger and is arranged so as to be inclined to the opposite side (machine room side) from the first heat exchanger (the following such heat exchanger). The arrangement of is referred to as "λ type").

Japanese Unexamined Patent Publication No. 2009-243801 Japanese Unexamined Patent Publication No. 2011-202821

In the indoor unit described in Patent Document 2, the area where heat exchange is possible is increased as compared with the one described in Patent Document 1 by increasing the number of heat exchangers. In that respect, the indoor unit described in Patent Document 2 has increased energy efficiency, which leads to energy saving. However, in the indoor unit described in Patent Document 2, not only the first heat exchanger but also the second heat exchanger is arranged diagonally, so that the first heat exchanger and the second heat exchanger Sub-drain pans had to be installed on both sides. However, as described above, when the sub-drain pan is installed on the leeward side of the heat exchanger, the sub-drain pan blocks the air passage, and the input of the indoor blower becomes large. For this reason, even in the indoor unit described in Patent Document 2, there is a problem that sufficient energy-saving operation has not yet been performed.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an air-conditioning indoor unit for a computer room, which enables more energy-saving operation than the prior art.

The air-conditioning indoor unit for a computer room according to the present invention is a machine having a suction port on the ceiling and an outlet on the bottom, and a machine arranged on the inner wall surface side of the housing and accommodating a compressor. The chamber, the heat exchanger arranged in the housing, the drain pan that receives the dew condensation of the heat exchanger, and the air that is arranged in the housing so as to face the outlet and sucked air from the suction port. It is provided with a blower that blows out from the outlet via the heat exchanger. The heat exchanger has a first heat exchanger arranged so as to be inclined toward the side opposite to the machine room, and a length shorter than that of the first heat exchanger and above the machine room. It is equipped with a second heat exchanger arranged vertically. The drain pans are a main drain pan provided below each of the first heat exchanger and the second heat exchanger, and a plurality of sub drain pans provided on the downstream side of the air flow of the first heat exchanger. And, it is equipped with.

According to the air conditioner indoor unit for the computer room according to the present invention, the heat exchange includes a first heat exchanger and a second heat exchanger, and the second heat exchanger is perpendicular to the upper part of the machine room. Since it is arranged in, the drain of the second heat exchanger can be received by the main drain pan, and the sub drain pan is unnecessary. For this reason, the number of sub-drain pans for the entire air-conditioning indoor unit for the computer room is smaller than that of the conventional one, and energy-saving cooling operation is realized.

It is a vertical sectional view of the air-conditioning indoor unit for a computer room which concerns on Embodiment 1 of this invention.

Embodiment 1.
FIG. 1 is a vertical cross-sectional view of an air-conditioning indoor unit for a computer room (hereinafter referred to as an indoor unit) according to the first embodiment of the present invention. The indoor unit 1 includes a casing 2. The casing 2 has a suction port 2a formed on the ceiling portion and an outlet 2b formed on the bottom surface portion. The casing 2 corresponds to the housing of the present invention. A mesh-shaped cover or a filter may be provided at the suction port 2a and the outlet 2b. Heat exchangers 11a and 11b are arranged on the ceiling side in the casing 2. The heat exchanger 11a is arranged diagonally toward the lower side opposite to the machine room 14 described later. The heat exchanger 11b is shorter in length than the heat exchanger 11a and is arranged vertically. The upper end of the heat exchanger 11a and the upper end of the heat exchanger 11b are arranged close to each other and toward the suction port 2a. The heat exchanger 11a corresponds to the first heat exchanger of the present invention, and the heat exchanger 11b corresponds to the second heat exchanger of the present invention.

A blower 12 is arranged on the bottom surface side in the casing 2. The blower 12 has a structure in which its outlet is arranged toward the outlet 2b and blows cooling air into the double floor of the computer room. A terminal block 13, a machine room 14, and an electric room 15 are arranged on one inner wall surface side of the casing 2. Each of the terminal block 13, the machine room 14, and the electric room 15 is formed in a box shape and is arranged so as to be stacked along the inner wall surface. The terminal block 13 makes an electrical connection with a power line from the outside. A compressor 14a, a decompression device (not shown), and the like are arranged in the machine room 14. The compressor 14a is arranged in the casing 2 (machine room), and the noise of the outdoor unit can be reduced by this. A control board (not shown) is housed in the electric room 15. The control board is equipped with an inverter circuit for driving the compressor 14a, a drive circuit for driving the blower 12, and the like.

Main drain pans 21a and 21b are arranged at the lower ends of the heat exchangers 11a and 11b, respectively. The main drain pan 21b is connected to the main drain pan 21a via, for example, a hose (not shown). The water (drain) collected in the main drain pan 21b is supplied to the main drain pan 21a via a hose. The water collected in the main drain pan 21a is configured to be drained to the outside. Sub-drain pans 22a to 22c are arranged on the leeward side (downstream side) of the heat exchanger 11a. Regarding the mutual relationship between the sub-drain pans 22a to 22c, in a plan view, the lower end portion of the sub-drain pan 22a and the upper end portion of the sub-drain pan 22b overlap, and the lower end portion of the sub-drain pan 22b and the upper end portion of the sub-drain pan 22c overlap. It has an overlapping positional relationship. Therefore, the water (drain) of the sub-drain pan 22a flows into the sub-drain pan 22b, and the water in the sub-drain pan 22b flows into the sub-drain pan 22c. Then, the water in the sub drain pan 22c flows into the main drain pan 21a.

The indoor unit 1 is connected to an outdoor unit (not shown) via a refrigerant pipe. The outdoor unit contains a heat exchanger and a blower that function as a condenser. The heat exchangers 11a and 11b of the indoor unit 1, the compressor 14a and the decompression device constitute a refrigeration cycle together with the heat exchanger (condenser) housed in the outdoor unit. That is, the refrigerant compressed by the compressor 14a of the indoor unit 1 is condensed by the heat exchanger (condenser) of the outdoor unit, and then decompressed by the decompression device of the indoor unit 1. The decompressed refrigerant is guided to the heat exchangers 11a and 11b to cool the surrounding air, and then returns to the compressor 14a.

Next, the operation of the indoor unit 1 of FIG. 1 will be described.
When the blower 12 is rotationally driven in a state where the refrigerant circulates in the refrigeration cycle as described above and the heat exchangers 11a and 11b cool the surrounding air, air is sucked from the suction port 2a of the casing 2. Is done. Then, the air sucked from the suction port 2a of the casing 2 is heat-exchanged by the heat exchanger 11a and the heat exchanger 11b to be cooled. The cooled air is blown out from the outlet 2b of the casing 2 into the double floor of the computer room. This blown air cools the server or the like arranged on the double floor of the computer room.

During such a cooling operation, dew condensation may occur on the heat exchangers 11a and 11b. Condensation on the heat exchanger 11a flows into the sub-drain pans 22a to 22c and the main drain pan 21a and is drained to the outside. Condensation on the heat exchanger 11b flows to the main drain pan 21b, further flows from the main drain pan 21b to the main drain pan 21a, and is drained to the outside.

By the way, in the present embodiment, the heat exchanger 11b is arranged vertically, and the main drain pan 21b can receive all the dew condensation of the heat exchanger 11b. Therefore, the heat exchanger 11b does not require a sub-drain pan. Therefore, in the present embodiment, the effects shown in the examples in Table 1 are obtained in comparison with the prior art (Patent Document 2). That is, as a unit, one sub-drain pan can be reduced. As a result, the input of the blower can be reduced by 3.8%. This is because the in-flight static pressure loss can be reduced by 4.6%. Since the input of the blower 12 can be reduced, the amount of heat generated by the blower 12 is also reduced. Therefore, the influence of the heat of the blower 12 on the air blown out from the outlet 2b can be reduced.

As described above, according to the present embodiment, the heat exchanger is larger than the heat exchanger 11a arranged so as to be inclined toward the side opposite to the machine room 14 and the heat exchanger 11a having a length. Although it is short and has a heat exchanger 11b vertically arranged above the machine room 14, the heat exchanger 11b does not require a sub-drain pan. Therefore, the number of sub-drain pans for the indoor unit 1 as a whole can be reduced as compared with the case where the heat exchanger 11b is provided with the sub-drain pans. Therefore, energy-saving cooling operation can be realized as compared with the conventional case.

Further, according to the present embodiment, the heat exchanger 11a and the heat exchanger 11b are arranged so that the upper ends of both are arranged close to each other and the upper ends of both are directed toward the suction port 2a. The air sucked from the suction port 2a effectively passes through the heat exchanger 11a and the heat exchanger 11b. Therefore, the air sucked from the suction port 2a efficiently exchanges heat.

Further, according to the present embodiment, the drain pans are the main drain pans 21a and 21b provided below the heat exchangers 11a and 11b, respectively, and a plurality of sub-drain pans provided on the downstream side of the air flow of the heat exchanger 11a. 22a to 22c are provided, and the heat exchanger 11b does not require a sub-drain pan, but can effectively receive dew condensation on the heat exchangers 11a and 11b. Although 11b is arranged vertically in the heat exchanger, it does not have to be strictly vertical, and if all the dew condensation can be received by the main drain pan 21b, it may be inclined up to that limit. ..

1 Computer room air conditioning indoor unit (indoor unit), 2 Casing, 2a suction port, 2b outlet, 11a heat exchanger, 11b heat exchanger, 12 blower, 13 terminal block, 14 machine room, 14a compressor, 15 Electric room, 21a, 21b main drain pan, 22a-22c sub drain pan.

Claims (2)

A housing with a suction port on the ceiling and an outlet on the bottom,
A machine room arranged on the inner wall surface side of the housing and accommodating a compressor, and
The heat exchanger arranged in the housing and
A drain pan that receives condensation from the heat exchanger and
A blower arranged in the housing so as to face the outlet, and blowing air sucked from the suction port from the outlet via the heat exchanger.
With
The heat exchanger is
A first heat exchanger arranged so as to be inclined toward the side opposite to the machine room,
Shorter than the length first heat exchanger, Bei example and a second heat exchanger disposed vertically above the machine room,
The drain pan
A main drain pan provided at the bottom of the first heat exchanger and the second heat exchanger, respectively.
A plurality of sub-drain pans provided on the downstream side of the air flow of the first heat exchanger are provided.
Air-conditioning indoor unit for computer room. The upper ends of both the first heat exchanger and the second heat exchanger are arranged close to each other, and the upper ends of both are arranged so as to face the suction port.
The air-conditioning indoor unit for a computer room according to claim 1 .

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