JP2020070936A - Ventilation system - Google Patents

Abstract

To improve an environment of a non-air-conditioned space while preventing external air from flowing thereinto through an unintended section without increasing a cost and complicating a configuration.SOLUTION: A ventilation system comprises: an air supply passage 2 which supplies external air OA to an air-conditioned space K1; an exhaust passage 3 which exhausts air RA in the air-conditioned space K1 out thereof; and a heat exchange section 4 which exchanges heat between the external air OA in the air supply passage 2 and the air RA in the exhaust passage 3. The exhaust passage 3 is connected to a non-air-conditioned space K2 so as to supply the air RA after heat exchange through the heat exchange section 4 thereto and provided with a bypass passage 8 which bypasses the heat exchange section 4 in a manner that connects a section of the air supply passage 2 at an upstream side of the heat exchange section 4 in an air flow direction of the air OA to the non-air-conditioned space K2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a ventilation system that ventilates an air-conditioned space.

  As a ventilation system, an air supply path that supplies outside air into the air conditioning target space such as a living room, an exhaust path that exhausts air in the air conditioning target space to the outside of the air conditioning target space, an outside air of the air supply path and an air of the exhaust path. It is known that a heat exchange part for exchanging heat is provided (for example, refer to Patent Document 1).

  In the system described in Patent Document 1, the heat exchange section exchanges heat between the air conditioned in the air-conditioned space and the outside air, and the heat-exchanged outside air is supplied to the air-conditioned space to reduce the air conditioning loss. We are trying to save energy.

JP, 9-210421, A

In the ventilation system as described in Patent Document 1, not only the air-conditioned space such as a living room but also the non-air-conditioned space such as a corridor or a warehouse is desired to be improved.
Therefore, the air in the air-conditioned space after heat exchange in the heat exchange unit is supplied to the non-air-conditioned space instead of being exhausted to the outside, so that the air in the air-conditioned space after heat exchange is used. It is considered to improve the environment of the non-air-conditioned space. Therefore, it is considered that the exhaust passage is connected to the non-air conditioning target space in a state of supplying the air that has undergone heat exchange in the heat exchange section to the non-air conditioning target space.

  However, during operation of the system that allows air to flow through the air supply passage and the exhaust passage, the air in the air-conditioned space after heat exchange can be supplied to the non-air-conditioned space through the exhaust passage, During the operation stop of the system for stopping the air flow in the road, the air in the air-conditioned space after heat exchange cannot be supplied to the non-air-conditioned space. Therefore, when the system is out of operation, if the suction action is applied to the non-air-conditioned space due to ventilation in other spaces, outside air will flow in from an unintended part, creating drafts and polluting. There will be problems such as outside air flowing in.

  In order to solve this problem, it is considered that the ventilation system is always operated, but in this case, the energy consumption increases, the cost increases, and the energy saving is hindered. It is also conceivable to provide an outside air introduction path for allowing the outside air to flow therethrough and supplying it to the non-air-conditioned space, but in this case, an outside air introduction path having a long length that connects the outside and the non-air-conditioned space is provided. Therefore, the cost is increased and the configuration is complicated.

  In view of this actual situation, the main problem of the present invention is to improve the environment of the non-air-conditioned space while suppressing the inflow of outside air from an unintended part without inviting cost increase and complication of the configuration. The point is to provide a ventilation system that can.

A first characteristic configuration of the present invention is an air supply path for supplying outside air into an air-conditioned space,
An exhaust path for exhausting the air in the air-conditioned space to the outside of the air-conditioned space,
A heat exchange unit for exchanging heat between the outside air of the air supply passage and the air of the exhaust passage,
The exhaust passage is connected to the non-air-conditioned space in a state of supplying air after heat exchange in the heat exchange section to the non-air-conditioned space,
In the state where the heat exchange unit is bypassed, a bypass passage is provided that connects an upstream side portion of the air supply passage in the air flow direction with respect to the heat exchange unit to a non-air-conditioned space.

  According to this configuration, the exhaust passage is connected to the non-air-conditioned space in a state of supplying the air that has undergone heat exchange in the heat exchange portion to the non-air-conditioned space. It is possible to supply the air in the air-conditioned space after heat exchange in the non-air-conditioned space to improve the environment of the non-air-conditioned space. Since the bypass passage that connects the upstream side portion of the air supply direction in the air supply direction to the non-air-conditioned space in the air supply passage is provided, even when the system is not operating, the outside air is passed through the bypass passage. Can be supplied to the non-air-conditioned space. Moreover, since the bypass passage has a simple structure in which the upstream side portion in the air flow direction of the heat exchange portion in the air supply passage is connected to the non-air-conditioned space, the cost is increased and the configuration is complicated. Of course, it is possible to supply the outside air to the non-air-conditioned space while the system is stopped.

  From the above, it is possible to improve the environment of the non-air-conditioned space while suppressing the inflow of outside air from an unintended portion without increasing costs and complicating the configuration.

  A second characteristic configuration of the present invention is that the bypass passage allows air to flow from the non-air conditioning target space side to the supply passage side during an operation in which air flows in the air supply passage and the exhaust passage. And a bypass damper that allows air to flow from the air supply path side to the non-air-conditioned space side during an operation stop that stops air flow in the air supply path and the exhaust path. There is a point.

  According to this configuration, since the bypass damper allows the air to flow from the air supply path side to the non-air-conditioned space while the system is stopped, the outside air is supplied to the non-air-conditioned space through the bypass path. be able to. During operation of the system, the bypass damper blocks the flow of air from the non-air conditioning target space side to the air supply path side. It is possible to prevent adverse effects.

  In a third characteristic configuration of the present invention, the bypass passage has an upstream side portion in the air flow direction of the heat exchange portion in the air supply passage and an air flow direction of the exhaust passage in the air passage direction more than the heat exchange portion. Is connected to the downstream side part of.

  According to this configuration, the bypass passage connects the upstream side portion in the air flowing direction of the heat exchange portion in the air supply passage and the downstream side portion in the air flowing direction of the heat exchange portion in the exhaust passage. Therefore, a part of the exhaust passage connected to the non-air-conditioned space can also be used as the bypass passage, and the configuration can be simplified.

The figure which shows the whole schematic structure of the ventilation system in 1st Embodiment. The figure which shows the whole schematic structure of the ventilation system in 2nd Embodiment. The figure which shows the whole schematic structure of the ventilation system in 3rd Embodiment.

An embodiment of a ventilation system according to the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, the ventilation system 1 includes an air supply passage 2 for supplying outside air OA into an air conditioning target space K1 such as a living room, and an exhaust gas for exhausting air RA in the air conditioning target space K1 to the outside of the air conditioning target space K1. A passage 3 and a heat exchange unit 4 for exchanging heat between the outside air OA of the air supply passage 2 and the air RA of the exhaust passage 3 are provided. The heat exchange unit 4 is configured as a total heat exchange type that exchanges both latent heat and sensible heat, for example.

  An air supply fan 5 is arranged in the air supply passage 2 downstream of the heat exchange unit 4 in the flow direction of the outside air OA. In the exhaust passage 3, an exhaust fan 6 is arranged downstream of the heat exchange unit 4 in the flow direction of the air RA. A casing 7 is arranged on the ceiling of the air conditioning target space K1, and in addition to the part of the air supply passage 2, the part of the exhaust passage 3, and the heat exchange part 4, the air supply fan 5, An exhaust fan 6 is provided. By the way, the position of the casing 7 arranged in the ceiling of the air-conditioned space K1 can be appropriately changed.

  By operating the air supply fan 5 and the exhaust fan 6, the outside air OA is made to flow in the air supply passage 2 and the air RA in the air-conditioned space K1 is made to flow in the exhaust passage 3 to form a heat exchange unit. At 4, heat exchange is performed between the outside air OA and the air RA. As a result, the outside air OA from which the heat of the air RA conditioned by the air conditioner (not shown) is recovered is supplied to the air conditioning target space K1 to reduce the air conditioning loss.

  The exhaust passage 3 is connected to the non-air-conditioning target space K2 in a state of supplying the air RA that has undergone heat exchange in the heat exchange section 4 to the non-air-conditioning target space K2. As the non-air-conditioned space K2, various spaces such as a corridor, a warehouse, and a machine room can be applied. The exhaust passage 3 supplies the air RA having the preheat after being heat-exchanged in the heat exchange section 4 to the non-air-conditioned space K2, so that the air RA in the air-conditioned space K1 is effectively used. The non-air-conditioned space K2 can be air-conditioned to some extent, and the environment of the non-air-conditioned space K2 can be improved.

  A ventilation space K3 is provided adjacent to the non-air-conditioned space K2. The ventilation space K3 can be, for example, a space such as a toilet. In the ventilation space K3, as shown by the arrow in FIG. 1, for example, the air in the ventilation space K3 is exhausted to the outside through the ventilation space exhaust passage 11 by a ventilation device (not shown) that operates for 24 hours. As indicated by the arrow in FIG. 1, the suction action acts on the ventilation space K3 and the non-air-conditioned space K2 by exhausting air in the ventilation space K3. Therefore, the air supplied to the non-air-conditioned space K2 is allowed to flow into the ventilation space K3 through the communication portion between the non-air-conditioned space K2 and the ventilation space K3, and the ventilation space exhaust passage 11 of the ventilation space K3. It is possible to ventilate the non-air-conditioned space K2 together with the ventilation space K3.

  When supplying air to the non-air-conditioned space K2, the ventilation system 1 not only includes the exhaust passage 3 but also bypasses the heat exchanging portion 4, and the outside air OA of the outside air OA is higher than that of the heat exchanging portion 4 in the air supplying passage 2. A bypass passage 8 that connects the upstream side portion in the flow direction and the non-air-conditioned space K2 is provided.

  The bypass passage 8 connects an upstream side portion of the air supply passage 2 in the flow direction of the outside air OA to the heat exchange portion 4 and a downstream passage portion of the exhaust path 3 in the flow direction of the air RA from the heat exchange portion 4. is doing. As a result, the bypass passage 8 also serves as a part of the exhaust passage 3 connected to the non-air-conditioned space K2.

  The bypass passage 8 is provided with a bypass damper 9 composed of a motor damper. During the operation in which the air OA and RA flow through the air supply path 2 and the exhaust path 3, the bypass damper 9 is closed, and the air RA flows from the non-air-conditioned space K2 side to the air supply path 2 side. Is being blocked. The bypass damper 9 is opened during the operation stoppage that stops the flow of the air OA and RA in the air supply passage 2 and the exhaust passage 3, and the air OA from the air supply passage 2 side to the non-air-conditioned space K2 side is discharged. Allows flow.

  The ventilation system 1 includes a control unit 10 that controls the operation of the ventilation system 1. The control unit 10 controls the open / closed state of the bypass damper 9 in addition to the operating states of the air supply fan 5, the exhaust fan 6, and the like. A remote controller (not shown) including an operation switch of the ventilation system 1 is provided, and the control unit 10 controls the operating states of the air supply fan 5, the exhaust fan 6, and the bypass damper 9 based on a command from the remote controller. is doing.

  When the control unit 10 receives an operation start command from the remote controller, for example, the operation switch is turned on by a user or the like, the air supply fan 5 and the exhaust fan 6 are started to operate, and the operation of the ventilation system 1 is started. In addition, the bypass damper 9 is controlled to be closed. During operation of the ventilation system 1, the bypass damper 9 in the closed state prevents the air RA from flowing from the non-air-conditioned space K2 side to the air supply passage 2 side. In this case, the outside air OA of the air supply passage 2 recovers the heat of the air RA in the heat exchange unit 4 and supplies the heat to the air conditioning target space K1. The air RA in the air-conditioned space K1 is heat-exchanged with the outside air OA in the heat exchange section 4 by the exhaust passage 3, and then is supplied to the non-air-conditioned space K2.

  When the control unit 10 receives an operation stop command from the remote controller, such as when the operation switch is turned off by the user or the like, the air supply fan 5 and the exhaust fan 6 are deactivated and the operation of the ventilation system 1 is stopped. In addition, the bypass damper 9 is controlled to the open state. While the ventilation system 1 is not operating, the bypass damper 9 in the open state allows the air OA to flow from the air supply passage 2 side to the non-air-conditioned space K2 side. In this case, when the suction action acts on the ventilation space K3 and the non-air-conditioned space K2 due to the exhaust of air in the ventilation space K3, the outside air OA exchanges heat through the air supply passage 2, the bypass passage 8 and the exhaust passage 3. It is supplied to the non-air-conditioning target space K2 while bypassing the section 4. As a result, even if the suction action acts on the ventilation space K3 and the non-air-conditioned space K2 due to the exhaust of air in the ventilation space K3, the non-air-conditioned space is controlled while suppressing the inflow of the outside air OA from an unintended portion. Ventilation of K2 can be performed.

[Second Embodiment]
The second embodiment shows another embodiment of the bypass 8 of the first embodiment. Hereinafter, the configuration of the bypass 8 according to the second embodiment will be described with reference to FIG. 2. Since the other configurations are the same as those of the first embodiment, the description thereof will be omitted by giving the same reference numerals and the like.

  In the first embodiment, as shown in FIG. 1, the bypass passage 8 is provided more upstream than the heat exchange portion 4 in the air supply passage 2 in the upstream side portion in the flow direction of the outside air OA and the heat exchange portion 4 in the exhaust passage 3. By connecting the downstream side portion of the air RA in the flow direction, a part of the exhaust passage 3 is also used. On the other hand, in the second embodiment, as shown in FIG. 2, the bypass passage 8 has an upstream side portion in the flow direction of the outside air OA with respect to the heat exchange portion 4 in the air supply passage 2 and the non-air-conditioned space K2. Are provided separately from the exhaust passage 3.

  For example, when the distance between the arrangement position of the casing 7 and the non-air-conditioned space K2 is short, the bypass passage 8 can be directly connected to the non-air-conditioned space K2 as shown in FIG. The outside air OA can be appropriately supplied to the non-air-conditioned space K2 through the bypass 8 without affecting 3).

[Third Embodiment]
The third embodiment shows another embodiment of the bypass damper 9 of the first embodiment. Hereinafter, the configuration of the bypass damper 9 according to the third embodiment will be described with reference to FIG. 3, but the other configurations are similar to those of the first embodiment, and therefore the description thereof will be omitted by giving the same reference numerals and the like.

  In the first embodiment, as shown in FIG. 1, the bypass damper 9 is composed of a motor damper. On the other hand, in the third embodiment, the bypass damper 9 is composed of the backflow prevention damper 12. The backflow prevention damper 12 always blocks the flow of the air RA from the non-air-conditioning target space K2 side to the air supply passage 2 side, and at the same time, prevents the air OA from the air-supply passage 2 side to the non-air conditioning target space K2 side. Allows flow. Accordingly, the control unit 10 does not control the backflow prevention damper 12 and the airflow RA from the non-air-conditioned space K2 side to the air supply passage 2 side is controlled by the backflow prevention damper 12 during the operation of the ventilation system 1. Flow can be blocked. Further, while the ventilation system 1 is stopped, the backflow prevention damper 12 can allow the air OA to flow from the air supply passage 2 side to the non-air-conditioned space K2 side.

  For example, if the pressure loss in the air supply passage 2 is small, it is possible to supply the outside air OA to the air conditioning target space K1 while preventing the outside air OA from flowing into the bypass passage 8. If the distance from the outside air intake in the air supply path 2 to the non-air-conditioned space K2 is short and the pressure loss in the bypass 8 is small, the outside air OA can be supplied to the non-air-conditioned space K2 in the bypass 8. it can. Therefore, when the pressure loss in the air supply passage 2 is small, the distance from the outside air intake in the air passage 2 to the non-air-conditioned space K2 is short, and the pressure loss in the bypass passage 8 is small, as shown in FIG. When the backflow prevention damper 12 is used as the damper 9, the configuration can be simplified and the outside air OA can be appropriately supplied to the non-air-conditioned space K2.

[Another embodiment]
Another embodiment of the present invention will be described. The configurations of the respective embodiments described below are not limited to being applied individually, but may be applied in combination with the configurations of other embodiments.
(1) In the above-described embodiment, the air supply fan 5 is arranged downstream of the heat exchange unit 4 in the air supply passage 2 in the flow direction of the outside air OA. However, for example, the outside air OA is provided in the air supply passage 2. It can also be arranged upstream of the heat exchange section 4 in the flow direction of, and the position of the air supply fan 5 can be appropriately changed.

(2) In the above-described embodiment, the exhaust fan 6 is arranged downstream of the heat exchange unit 4 in the exhaust passage 3 in the flowing direction of the air RA. The exhaust fan 6 may be arranged upstream of the heat exchange section 4 in the flow direction, and the position of the exhaust fan 6 may be changed as appropriate.

1 Ventilation system 2 Air supply path 3 Exhaust path 4 Heat exchange section 8 Bypass path 9 Bypass damper 12 Backflow prevention damper (bypass damper)
K1 Air-conditioned space K2 Non-air-conditioned space OA Outside air RA Air in air-conditioned space

Claims (3)

An air supply path for supplying outside air into the air-conditioned space,
An exhaust path for exhausting the air in the air-conditioned space to the outside of the air-conditioned space,
A heat exchange unit for exchanging heat between the outside air of the air supply passage and the air of the exhaust passage,
The exhaust passage is connected to the non-air-conditioned space in a state of supplying air after heat exchange in the heat exchange section to the non-air-conditioned space,
A ventilation system provided with a bypass passage that connects a non-air-conditioned space to an upstream side portion of the air supply passage in the air flow direction in the air supply passage in a state of bypassing the heat exchange portion.   In the bypass passage, air is prevented from flowing from the non-air conditioning target space side to the air supply passage side during an operation in which the air is passed in the air supply passage and the exhaust passage, and The bypass damper for permitting the flow of air from the air supply passage side to the non-air-conditioned space side during operation stoppage that stops the flow of air in the passage and the exhaust passage is provided. Ventilation system. The bypass passage connects an upstream side portion of the air supply passage in the air flow direction with respect to the heat exchange portion and a downstream side portion of the exhaust passage in the air flow direction with respect to the heat exchange portion. The ventilation system according to claim 1 or 2.

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