Inter-floor ventilation structure

Abstract

To prevent or reduce condensation in inter-floor spaces during the summer.SOLUTION: The inter-floor ventilation structure is for ventilating an inter-floor space (20) located above an indoor space (10) including a living room (11) and a non-living room (12), and includes an air supply fan (3) installed in a ceiling (11a) of the living room to send air from the living room into the inter-floor space, and an exhaust unit (4) to exhaust air from the inter-floor space to the outdoors. The exhaust unit typically includes an air vent (41) installed in the ceiling (12a) of the non-living room, and an exhaust fan (42) to exhaust air from the inter-floor space that has flowed out of the air vent into the non-living room to the outdoors.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an inter-floor ventilation structure for ventilating an inter-floor space located above an indoor space including an occupied room and a non-occupied room. [Background technology]

[0002] Ventilation of inter-floor spaces is carried out to expel water vapor released from materials such as ALC (lightweight aerated concrete) placed in the inter-floor spaces of a building. One method of ventilating inter-floor spaces, as disclosed in Japanese Patent Laid-Open Publication No. 2002-4448 (Patent Document 1), involves providing air intakes and exhaust fans on the outer walls between floors and ventilating the inter-floor spaces with outside air. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-4448 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, when ventilation is performed by directly drawing in outside air into the inter-floor space, it is difficult to reduce the humidity in the inter-floor space when the outside humidity is high. In summer (including the rainy season), when high humidity outside air is supplied to the inter-floor space, there is a possibility that condensation will occur in the inter-floor space due to the water vapor released from the ALC.

[0005] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide an inter-floor ventilation structure that can prevent or suppress condensation from occurring in the inter-floor space in summer. [Means for solving the problem]

[0006] An inter-floor ventilation structure according to one aspect of the present invention is an inter-floor ventilation structure for ventilating an inter-floor space located above an indoor space including living rooms and non-living rooms, and is equipped with an air supply fan installed on the ceiling of the living room to send air from the living room into the inter-floor space, and an exhaust section to exhaust air from the inter-floor space to the outdoors.

[0007] Preferably, the exhaust section includes a vent provided in the ceiling of the non-occupied room, and an exhaust fan that exhausts air in the inter-floor space that has flowed out of the vent into the non-occupied room to the outdoors.

[0008] Typically, the indoor space is constantly ventilated using a Type 1 or Type 3 ventilation system. In this case, it is desirable that the exhaust fan also serves as an exhaust fan for constant ventilation.

[0009] It is desirable that the vent be provided with a pressure adjusting means for maintaining a substantially constant pressure in the inter-floor space, thereby preventing outside air from entering through gaps in the exterior walls of the inter-floor space even when the negative pressure level in the indoor space increases due to the operation of a local ventilation fan, etc.

[0010] Preferably, the inter-floor ventilation structure further includes air supply control means for adjusting the strength of the air supply fan depending on whether or not the air conditioner installed in the room is in cooling operation.

[0011] The exhaust section may be constituted by an exhaust fan provided on an outer wall between floors located in the space between floors.

[0012] It is desirable that the air volume of the supply air fan be determined so that the inter-floor space is at positive pressure when the supply air fan is operating. [Effects of the Invention]

[0013] According to the present invention, in summer, dehumidified (air-conditioned) air from inside a room can be taken into the inter-floor space, thereby preventing or suppressing condensation from occurring in the inter-floor space. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram showing an overview of an inter-floor ventilation structure according to an embodiment of the present invention. [Figure 2] 10A and 10B are diagrams showing specific examples of installation positions of an air supply fan and an exhaust unit. [Figure 3] 5 is a flowchart showing an intensity determination process executed by the control device (air supply control means) of the air supply fan in the present embodiment. [Figure 4] FIG. 10 is a diagram showing a schematic diagram of an increase in ventilation airflow in the inter-floor space when cooling a room. [Figure 5] 10A and 10B are diagrams illustrating the function of a pressure adjusting means provided in the ventilation opening. [Figure 6] 10 is a diagram showing a schematic view of the air flow when no pressure adjusting means is provided in the ventilation opening. FIG. [Figure 7] FIG. 10 is a diagram schematically showing an inter-floor ventilation structure according to a modified example of an embodiment of the present invention. [Figure 8] FIG. 1 is a diagram showing a known interfloor ventilation structure. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and description thereof will not be repeated.

[0016] <Outline of inter-floor ventilation structure> FIG. 1 is a schematic diagram showing an outline of an inter-floor ventilation structure according to this embodiment.

[0017] As shown in Figure 1, inter-floor space 20 is located above indoor space 10, which includes living rooms 11 and non-living rooms 12. Indoor space 10 is, for example, an indoor space on the first floor of a building (such as a house), and inter-floor space 20 is an attic space on the first floor, located between the indoor space on the first floor (indoor space 10) and the indoor space on the second floor (not shown). Indoor space 10 and inter-floor space 20 are insulated spaces that are insulated from the outside.

[0018] In this embodiment, the indoor space 10 is constantly ventilated by a third-class ventilation system. To this end, an air intake vent 51 is provided on the outer wall of the living room 11, and an exhaust fan 52 is provided on the outer wall of the non-living room 12. The living room 11 is equipped with an air conditioner (indoor unit) 61 capable of at least cooling operation.

[0019] The inter-floor ventilation structure of this embodiment is provided on the ceiling 11a of the living room 11 and includes an air supply fan 3 that sends air from the living room 11 into the inter-floor space 20, and an exhaust section 4 that exhausts the air from the inter-floor space 20 to the outdoors.

[0020] The inter-floor ventilation structure according to this embodiment does not have the inter-floor air supply opening 130 of the known inter-floor ventilation structure shown in Fig. 8, but instead has an air supply fan 3 provided on the ceiling 11a of the living room 11. The known inter-floor ventilation structure is a ventilation system that includes an inter-floor air supply opening 130 and an inter-floor exhaust fan 140 provided on the inter-floor exterior wall 21, and ventilates the inter-floor space 20 with fresh outside air.

[0021] <Example of exhaust section configuration> 1, the exhaust section 4 includes a vent (natural exhaust vent) 41 provided in the ceiling 12a of the non-occupied room 12, and an exhaust fan 42 that exhausts the air in the inter-floor space 20 that has flowed out into the non-occupied room 12 from the vent 41 to the outdoors. The exhaust fan 42 is provided on the outer wall of the non-occupied room 12.

[0022] In this embodiment, the vent 41 is configured as a ceiling louver having a predetermined opening area. The exhaust fan 42 also serves as an exhaust fan 52 for constant ventilation of the indoor space 10. The indoor space 10 is constantly ventilated by an air intake (natural air intake) 51 provided on the outer wall of the living room 11 and an exhaust fan 52 provided on the outer wall of the non-living room 12. The exhaust fan 52 is constantly operating.

[0023] In this way, the exhaust fan 42 also serves as the exhaust fan 52 for constant ventilation, which reduces the number of external hoods required for the building. As a result, the design of the building can also be improved.

[0024] <Installation location of intake fan and exhaust unit> Fig. 2 is a diagram showing a specific example of the installation positions of the intake fan 3 and the exhaust unit 4. Fig. 2 shows an example of the floor plan of an indoor space 10. The indoor space 10 includes a living / dining room (LDK) as an occupant room 11 and a washroom (dressing room) as a non-occupant room 12, and is surrounded by first to fourth exterior walls 10a to 10d. The occupant room 11 is located adjacent to the first and second exterior walls 10a, 10b, which intersect (are perpendicular to) each other. The non-occupant room 12 is located in a corner of the building where the third and fourth exterior walls 10c, 10d intersect.

[0025] The supply air fan 3 and the exhaust unit 4 (exhaust fan 42) are preferably located at positions that are approximately diagonally opposite each other in a plan view. In the example shown in FIG. 2, the exhaust unit 4 is provided near the corner of the building where the third and fourth exterior walls 10c, 10d intersect. In this case, the supply air fan 3 is preferably provided near the corner of the building where the first and second exterior walls 10a, 10b intersect. This allows the conditioned air taken in by the supply air fan 3 to be distributed throughout almost the entire inter-floor space 20.

[0026] Furthermore, it is desirable that the supply air fan 3 is disposed near the air conditioner (indoor unit) 61 installed in the room 11 in plan view. In the example shown in Fig. 2, the supply air fan 3 is provided directly above the space directly in front of the air conditioner 61 (the space facing the air outlet of the air conditioner 61). This allows the air blown out from the air conditioner 61 to be sent directly into the inter-floor space 20 by the supply air fan 3. Therefore, the conditioned air (cooled air) dehumidified by the air conditioner 61 can be sent efficiently into the inter-floor space 20.

[0027] In this embodiment, an example is shown in which the ventilation method for the indoor space 10 is a Type 3 ventilation method, but the inter-floor ventilation structure in this embodiment can also be applied to Type 1 ventilation methods (mechanical air supply, mechanical exhaust).

[0028] Furthermore, living room 11 in which air supply fan 3 is installed may be any room (air-conditioned space) that is to be air-conditioned by air-conditioning equipment 61, and may be, for example, a private room (bedroom). Non-living room 12 in which exhaust unit 4 is installed may be any room (non-air-conditioned space) that is equipped with exhaust fan 52 for constant ventilation, and may be, for example, a hallway.

[0029] <Air supply control means> In this embodiment, the control device 31 for the supply air fan 3 has a function of adjusting the strength of the supply air fan 3 depending on whether the air conditioner 61 is in cooling operation or not. The control device 31 constitutes an air supply control means that adjusts the strength of the supply air fan 3. The supply air fan 3 is constituted by, for example, a sirocco fan or a propeller fan.

[0030] 3 is a flowchart showing the intensity determination process executed by the control device 31. This process is executed repeatedly, for example, at regular time intervals (for example, every five minutes).

[0031] As shown in Fig. 3, the control device 31 determines whether the air conditioning of the air conditioner 61 is ON or not (step S1). If the air conditioning of the room 11 is ON (in cooling operation) (YES in step S1), the supply air fan 3 is operated at "high" (step S2). The ventilation volume during cooling operation is shown by the dashed arrow in Fig. 4.

[0032] In this way, during cooling operation, conditioned air (cold air) dehumidified by the air conditioner 61 is actively supplied to the inter-floor space 20, increasing the ventilation air volume of the inter-floor space 20. This ensures that water vapor released from the ALC is discharged and the humidity in the inter-floor space 20 is reduced.

[0033] On the other hand, if the air conditioner is OFF (air conditioner operation stopped) (NO in step S1), the indoor space 10 is in a natural temperature and humidity environment (e.g., equivalent to outside air), so the supply air fan 3 is operated at "weak" (step S3). The ventilation volume when the air conditioner is stopped is shown by the dashed arrow in Figure 2.

[0034] In this way, when the air conditioning is stopped, the ventilation air volume in the inter-floor space 20 is reduced to a level that can remove the water vapor released from the ALC. This makes it possible to suppress an increase in humidity in the inter-floor space 20 due to the air being supplied to the inter-floor space 20. It also provides an energy-saving effect.

[0035] As described above, the humidity environment in inter-floor space 20 can be effectively improved by changing the volume of air supplied to inter-floor space 20 depending on the cooling status of room 11. Note that exhaust fan 42 may remain in low operation regardless of the operating strength of supply air fan 3, or may be operated in conjunction with the operating strength of supply air fan 3 (when supply air fan 3 is operating at high strength, exhaust fan 42 may be operated at high strength).

[0036] <Pressure adjustment means> Air volume of intake fan 3 (unit: m 3 / h) is desirably determined, taking into consideration the air-blowing capacity of exhaust fan 42 and the opening area of ​​vent 41, so that at least when supply fan 3 is operating at high speed, operation of supply fan 3 creates a positive pressure in inter-floor space 20 (a state in which the pressure is higher than outside). Even when supply fan 3 is operating at low speed, the air volume of supply fan 3 is desirably determined so that inter-floor space 20 creates a positive pressure (or does not become an extremely negative pressure). This makes it possible to prevent or suppress the inflow of moist outside air into inter-floor space 20 through gaps in inter-floor exterior wall 21.

[0037] Here, when a local ventilation fan 62 (shown by phantom lines in FIG. 2) such as a range hood installed in the indoor space 10 is operated, the air in the indoor space 10 is forcibly exhausted to the outdoors, increasing the negative pressure (a state in which the pressure is lower than outside) in the indoor space 10. Therefore, when the local ventilation fan 62 is operated, the air in the inter-floor space 20 is pulled into the indoor space 10 (non-habitable room 12) through the air vent 41 as shown in FIG. 6, which may make it easier for moist outside air to be drawn into the inter-floor space 20 through gaps in the inter-floor exterior wall 21.

[0038] Therefore, it is desirable to provide pressure adjustment means such as a differential pressure damper 43 in the vent 41, as shown in Figure 5. Figure 5 is a diagram schematically showing the function of the pressure adjustment means provided in the vent 41. As shown in Figures 5(A) and (B), the differential pressure damper 43 has a mechanism that reduces the opening area of ​​the vent 41 as the negative pressure level in the indoor space 10 increases, thereby maintaining the pressure in the inter-floor space 20 at a substantially constant level.

[0039] Therefore, as shown in Figure 5(B), when the negative pressure level in the indoor space 10 increases due to the operation of the local ventilation fan 62, the opening area of ​​the vent 41 is adjusted to be smaller by the differential pressure damper 43. This allows the flow rate of air passing through the vent 41 to be approximately the same as when the local ventilation fan 62 is stopped as shown in Figure 5(A).

[0040] In this way, by providing the differential pressure damper 43 in the vent 41, the amount of air flowing out from the vent 41 can be adjusted to a substantially constant amount regardless of the negative pressure level in the indoor space 10. Therefore, even when the local ventilation fan 62 is operating, it is possible to suppress the inflow of outside air through gaps in the inter-floor exterior wall 21. This makes it possible to significantly reduce the risk of condensation occurring in the inter-floor space 20.

[0041] <Modification> In the above embodiment, an example has been described in which the exhaust fan 42 constituting the exhaust unit 4 also serves as the exhaust fan 52 for constant ventilation of the indoor space 10, but the present invention is not limited to such an example. In this case, the non-occupied room 12 in which the exhaust fan 42 is provided may be a room different from the room in which the exhaust fan 52 for constant ventilation is provided.

[0042] Alternatively, as shown in Fig. 7, the exhaust fan 44 constituting the exhaust section 4 may be provided on the inter-floor exterior wall 21. The inter-floor ventilation structure in this modified example does not have an air vent 41 in the ceiling 12a of the non-occupied room 12, and is a ventilation system in which the inter-floor space 20 is ventilated by the supply air fan 3 provided on the ceiling 11a of the occupied room 11 and the exhaust fan 44 provided on the inter-floor exterior wall 21. In this modified example, it is also desirable to position the supply air fan 3 and the exhaust fan 44 in approximately diagonal positions.

[0043] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0044] 3 Intake fan, 4 Exhaust section, 10 Indoor space, 11 Occupied room, 12 Non-occupied room, 11a, 12a Ceiling, 20 Inter-floor space, 21 Inter-floor exterior wall, 31 Control device, 41 Vent, 42, 44, 52 Exhaust fan, 43 Differential pressure damper, 51 Intake port, 61 Air conditioning equipment, 62 Local ventilation fan, 130 Inter-floor intake port, 140 Inter-floor exhaust fan.

Claims

1. An inter-floor ventilation structure for ventilating an inter-floor space located above an indoor space including a living room and a non-living room, an air supply fan provided on the ceiling of the living room and configured to send air from the living room into the inter-floor space; An inter-floor ventilation structure comprising an exhaust section that exhausts air in the inter-floor space to the outdoors.

2. The inter-floor ventilation structure according to claim 1, wherein the exhaust section includes an air vent provided in the ceiling of the non-habitable room and an exhaust fan that exhausts air from the inter-floor space that flows out of the air vent into the non-habitable room to the outdoors.

3. The indoor space is constantly ventilated by a first or third type ventilation system, The inter-floor ventilation structure according to claim 2, wherein the exhaust fan also serves as an exhaust fan for constant ventilation.

4. 3. The inter-floor ventilation structure according to claim 2, wherein the vent is provided with a pressure adjusting means for maintaining the pressure in the inter-floor space at a substantially constant level.

5. 2. The inter-floor ventilation structure according to claim 1, further comprising an air supply control means for adjusting the strength of the air supply fan depending on whether or not the air conditioning equipment installed in the room is in cooling operation.

6. 2. The inter-floor ventilation structure according to claim 1, wherein the exhaust section is constituted by an exhaust fan provided on an outer wall of the inter-floor space.

7. 7. The inter-floor ventilation structure according to claim 1, wherein the air volume of the supply air fan is determined so that the inter-floor space becomes positive pressure when the supply air fan is operated.

Images