JP3207043B2 - Outside air treatment unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outside air processing unit of an air heat source heat pump type for controlling the temperature and / or humidity of outside air and guiding it to a room.

[0002]

2. Description of the Related Art In general, an outdoor air processing unit comprising an indoor unit and an outdoor unit is provided, a passage for guiding the outside air to the building by controlling the temperature and / or humidity by the indoor unit, and the air inside the building to the outside of the building. There is known an outside air treatment unit having a passage for discharging air to the outside. This type is installed in a room such as a building to introduce a predetermined amount of outside air in accordance with a building management law.

[0003] In an outside air processing unit of the air heat source heat pump type, frost may be formed on the heat exchanger of the outdoor unit when the outside air is cold. In this case, for example, defrosting is performed for about 10 minutes. Driving

[0004]

However, if the defrosting operation is performed while introducing outside air into the building through the outside air processing unit, the indoor heat exchanger of the indoor unit functions as an evaporator (evaporator). However, there is a problem that the cold outside air is further cooled and introduced into the building, and the temperature inside the building is lowered.

[0005] In order to solve this, during defrosting operation,
It is proposed not to introduce outside air into the building through the outside air treatment unit.

However, according to this, there is a problem that a predetermined amount of outside air according to the Building Management Law is not introduced during the defrosting operation.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide an outside air processing unit which can ensure a sufficient amount of outside air in accordance with the Building Management Law even during defrosting operation. To provide.

[0008]

Means for Solving the Problems In order to achieve the above object, a first aspect of the present invention is an outdoor air processing unit for controlling the temperature and / or humidity of outside air by an indoor unit and guiding the air to a building. Is provided with at least two indoor heat exchangers, and when one functions as an evaporator during the defrosting operation, the other functions as a condenser.

According to a second aspect of the present invention, a first passage for guiding air inside the building to the indoor unit and discharging the air passing through the indoor unit to the outside of the building during the defrosting operation, and allowing the outside air to pass through the indoor unit. And a second passage leading into the building.

According to a third aspect of the present invention, during the defrosting operation, the first passage for guiding the air inside the building to the indoor unit and discharging the air passing through the indoor unit to the outside of the building, and the outside air without passing through the indoor unit. And a second passage leading into the building through the heater.

[0011]

When a frost is formed on, for example, an outdoor heat exchanger at a time when the outside air is cold (winter), a defrosting operation for removing the frost is performed.

According to the first invention, at the time of this defrosting operation, at least two indoor heat exchangers are provided in the indoor units in the path for guiding outside air into the building, and one of the indoor heat exchangers When functioning as an evaporator during the defrosting operation, the other indoor heat exchanger functions as a condenser, so the outside air warmed using the indoor heat exchanger functioning as the condenser Thus, a predetermined amount of outside air can be introduced during the defrosting operation without lowering the temperature inside the building.

According to the second aspect of the present invention, during the defrosting operation, first, the air inside the building is once guided to the indoor unit through the first passage, and the air passing through the indoor unit is discharged outside the building. As a result, the indoor heat exchanger of the indoor unit absorbs heat by that much, and the defrosting time of the outdoor heat exchanger of the outdoor unit connected to this is shortened. Also, at this time, since outside air is introduced into the building through the second passage, the amount of outside air introduced during the defrosting operation does not become insufficient, and the outside air is introduced without passing through the indoor unit. Therefore, it is not cooled at least by the indoor heat exchanger (evaporator) of the indoor unit, and the temperature in the building does not drop significantly.

According to the third aspect, during the defrosting operation, the outside air is heated by the heater and introduced.
Without lowering the temperature inside the building, even during defrosting operation,
A predetermined amount of outside air can be introduced.

[0015]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 100 denotes a building. The building 100 includes four rooms 1a to 1d, a corridor 2, a women's toilet 3, a hot water room 4, and a men's toilet 5.
, A staircase 6 and a machine room 7 are provided. Here, the rooms 1a to 1d are living areas, and the other parts are non-resident areas.

Each of the rooms 1a to 1d is provided with an indoor unit 8 embedded in the ceiling, and an outdoor unit (not shown) is connected to the indoor unit 8, and these indoor units 8 and an outdoor unit (not shown) are connected. Each of the rooms 1a to 1d is air-conditioned at an appropriate temperature.

Incidentally, a predetermined amount of outside air must be introduced into the building 100 in accordance with the building management method.

The outside air is temperature- and / or humidity-controlled by an outside air processing unit 11 provided in the machine room 7, and
Introduced within 00. The outdoor air processing unit 11 is the indoor unit 1
3 and an outdoor unit 15, which are connected by a refrigerant pipe 17 to form an air heat source heat pump. The outside air processing unit 11 includes an outside air introduction duct 26 and an air supply duct 29. The air supply duct 29 is branched, and each of the branch ducts 29a to 29d has four rooms 1a.
To 1d, and are connected to the respective outside air outlets 33a to 33d.

When outside air is introduced by the outside air processing unit 11, the same amount of air must be discharged outside the building 100.

The air discharged at this time is supplied to an ON-OFF type exhaust fan 200a-200c provided in a non-living area.
Is discharged through.

According to this embodiment, the outside air processing unit 11 is provided with two air heat source heat pumps as shown in FIG.

The indoor unit 13 includes a centrifugal blower 21, a humidifier 23, and an indoor heat exchanger 25a divided into two systems.
25b and a filter 26 are built in.
After outside air is introduced from above the outside 6 through an outside air introduction duct 27 and air-conditioned in the indoor unit 13, the outside air is blown out into the above-described rooms 1 a to 1 d through the air supply duct 29.

An outdoor unit 15 is connected to the indoor unit 13. The outdoor unit 15 has two expansion valves 31a,
31b, the outdoor heat exchangers 33a and 33b, and the four-way valve 35
a, 35b and compressors 37a, 37b are built in.

Next, the operation of this embodiment will be described.

When the outside air is cold, the outside air processing unit 1
When the outside air is introduced through 1, any four-way valve 35
a and 35b are switched as shown by the solid lines in the figure, and the compressors 37a and 37b are operated to flow the refrigerant in the arrow direction of the solid lines, and the blower 21 of the indoor unit 13 is operated.
In this case, since both of the indoor heat exchangers 25a and 25b are condensers, the outside air is warmed and sent to the room as indicated by arrows.

When frost is formed on the outdoor heat exchanger 33 of the outdoor unit 15 during the operation of introducing the outside air,
A defrosting operation is performed to remove this.

This defrosting operation is performed by switching the four-way valve 35 to a position opposite to the position shown in the drawing, and allowing the refrigerant to flow in the direction of the dotted arrow. In this case, since the indoor heat exchanger 23 of the indoor unit 13 functions as an evaporator, when outside air is introduced using this evaporator, the cold outside air is further cooled and sent indoors, and as a result, the building 100 The temperature in the inside is remarkably lowered.

According to this embodiment, since the outside air processing unit 11 is provided with two systems of air heat source heat pumps, when performing the defrosting operation of one system, the indoor system of the other system is used. Warm the outside air with a container,
By introducing it into the building, there is obtained an advantage that a predetermined amount of outside air can be introduced even during the defrosting operation without lowering the temperature inside the building.

For example, when performing the defrosting operation of one of the outdoor heat exchangers 33a, the compressor 37a is operated by switching only the four-way valve 35a to a position opposite to the position shown in the figure. Thereby, the indoor heat exchanger 25a functions as an evaporator. At this time, the compressor 37b is operated while the four-way valve 35b of the other system is kept at the position shown in the drawing to make the outdoor heat exchanger 33b function as a condenser, thereby warming the outside air and introducing the outside air into the building. I do. At this time, one damper 41a of the indoor unit 13 is closed and the other damper 41b is opened. When the outdoor heat exchanger 33b is to be defrosted, the operation opposite to the above is performed.

According to this, a predetermined amount of outside air can be introduced even during the defrosting operation without lowering the temperature in the building 100.

FIG. 3 shows another embodiment.

The discharge of air from the non-residential area is achieved by a single exhaust duct 16 connected to three exhaust ports 160a to 160c.
0 and one exhaust fan 150. According to this embodiment, the discharge duct 160 is included in the indoor unit 13, and the other configuration is almost the same as that of the above embodiment (FIG. 1).

As shown in FIG. 4, the indoor unit 13 has a passage (outside air introduction duct 26 and outside air supply duct 29) that guides the outside air to the building 100 by controlling the temperature and / or humidity by the indoor heat exchanger 25. ) 210 and the air in the building 100
A passage (discharge duct) 160 that discharges the outside of the internal unit 13 and a passage 23 that connects the passages 160 and 210 to the front and rear of the indoor unit 13.
0, 250 and a passage 270 connected to the passage 210 and bypassing the indoor unit 13.
250 and 270 have first to fourth dampers A, B,
C and D are provided.

The operation of this embodiment will be described. Normally, the first to fourth dampers A, B,
C and D are opened and closed. According to this, the outside air is controlled in temperature and / or humidity by the indoor heat exchanger 25, and
, The air is introduced into the building 100, and substantially the same amount of air as the introduced outside air is discharged from the building 100 through the passage 160.

When the outdoor heat exchanger of the outdoor unit 15 (see FIG. 3) is frosted, for example, at a time when the outside air is cold (winter), a defrosting operation for removing the frost is performed.

During the defrosting operation, the position shown in FIG.
The first to fourth dampers A, B, C, D are opened and closed.

According to this, the air in the building 100 passes through the passages 160 and 230 (first passage), is once guided to the indoor heat exchanger 25, and is then discharged out of the building 100. According to this, the indoor heat exchanger 25 of the indoor unit 13 sucks up heat by the temperature of the air in the building 100 (about 20 ° C.), so that the outdoor heat exchange of the outdoor unit 15 (see FIG. 5) connected thereto is performed. The defrosting time of the vessel (not shown) can be reduced.

Since outside air is introduced into the building 100 through the passage 270 (second passage), the amount of outside air introduced during the defrosting operation does not become insufficient, and the outside air does not pass through the indoor unit 13. Is not cooled at least by the indoor heat exchanger (evaporator) of the indoor unit 13, and the temperature inside the building 100 can be prevented from lowering.

In the middle period such as spring and autumn, the ventilation operation is performed without moving the indoor unit 13 and the outdoor unit 15.

In this case, first to first positions shown in FIG.
The fourth dampers A, B, C, D are opened and closed. According to this, since the outside air is introduced into the building 100 through the passage 270 that bypasses the indoor unit 13, the ventilation resistance is reduced as compared with the conventional method in which the outside air is introduced through the indoor unit 13 and the passage 210. The power of the blower (not shown) can be reduced.

Further, as another embodiment, referring to FIG. 4, a heater 290 made of, for example, a heater, a heat pipe, a heat storage material or the like may be provided at the outlet of the passage 210. According to this, with reference to FIG.
0 is introduced by being warmed by the heater 290, and the outside air is introduced by the outside air.
The temperature inside does not drop.

[0043]

As is apparent from the above description, according to the first aspect, when one indoor heat exchanger functions as an evaporator during the defrosting operation, the other indoor heat exchanger operates as a condenser. By introducing the outside air heated using the indoor heat exchanger functioning as a condenser into the building, a predetermined amount of outside air can be reduced during the defrosting operation without lowering the temperature inside the building. Can be introduced.

According to the second invention, the first defrost operation is performed.
The air in the building is once led to the indoor unit through the passage of
Since the air passing through this indoor unit is discharged outside the building,
Since the indoor heat exchanger of the indoor unit draws up heat correspondingly, the defrosting time of the outdoor heat exchanger of the outdoor unit connected to this is shortened. At this time, the outside air is introduced into the building through the second passage, so that the amount of outside air introduced during the defrosting operation does not become insufficient. Moreover, since the outside air is introduced without passing through the indoor unit, it is not cooled at least by the indoor heat exchanger (evaporator) of the indoor unit, and the temperature in the building does not drop significantly.

According to the third aspect, during the defrosting operation, the outside air is heated by the heater and introduced.
Without lowering the temperature inside the building, even during defrosting operation,
A predetermined amount of outside air can be introduced.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an outside air processing system.

FIG. 2 is a view showing one embodiment of an outside air processing unit according to the present invention.

FIG. 3 is a diagram showing an outside air processing system according to another embodiment.

FIG. 4 is a diagram showing the outside air processing unit of FIG. 3;

FIG. 5 is a view showing the outside air processing unit of FIG. 3;

FIG. 6 is a diagram showing an outside air processing unit of FIG. 3;

[Explanation of symbols]

 1a to 1d Room 11, 170 Outdoor air processing unit 13 Indoor unit 15 Outdoor unit 21 Centrifugal blower 25a, 25b Indoor heat exchanger 26 External air introduction duct 29 Supply duct 33a, 33b Outdoor heat exchanger 160, 210, 230, 250, 270 aisle

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akira Yamoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kohei Sato 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 47/02 F24F 3/00 F24F 1/00

Claims (3)

(57) [Claims] 1. An outdoor air processing unit for controlling the temperature and / or humidity of outdoor air by an indoor unit and guiding the outdoor air into a building, wherein the indoor unit is provided with at least two indoor heat exchangers,
An outside air processing unit characterized in that when one functions as an evaporator during a defrosting operation, the other functions as a condenser. 2. An outside air treatment unit comprising a passage for guiding outside air to a building by controlling the temperature and / or humidity of the outside air by an indoor unit, and a passage for discharging air in the building to the outside of the building. A first passage for guiding air inside the building to the indoor unit and discharging air passing through the indoor unit to the outside of the building, and a second passage for guiding outside air to the building without passing through the indoor unit. The outside air treatment unit characterized by the above. 3. An outside air processing unit having a passage for guiding the outside air to the building by controlling the temperature and / or humidity of the outside air by the indoor unit and a passage for discharging the air inside the building to the outside of the building. A first passage for guiding the air inside the building to the indoor unit and discharging the air passing through the indoor unit to the outside of the building, and a second passage for guiding the outside air to the building through the heater without passing through the indoor unit. An outside air treatment unit, comprising: