Ventilation system for house, house, and ventilation method

Abstract

To provide a ventilation system for a house capable of stabilizing ventilation frequency in a summer season.SOLUTION: Provided is a ventilation system 1 for a house. A house 2 includes an underfloor space 3 and a living room 11. The ventilation system 1 includes: a filter device 21 for purifying air in the underfloor space 3; an air supply device 22 provided with a fan 22a for supplying the purified air in the underfloor space to the living room 11; an air conditioner 23 disposed in the living room 11 and capable of performing at least a cooling operation; an opening part 24 provided to a floor part; an opening / closing device 25 capable of opening / closing the opening part 24; and a control device 26 for driving the fan 22a. The control device 26 can switch a mode between a first mode where the opening part 24 is closed when the cooling operation is not performed and the fan 22a is driven with a first air volume, and a second mode where the opening part 24 is opened when the cooling operation is performed and the fan 22a is driven with a second air volume larger than the first air volume.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a ventilation system for a house, a house, and a ventilation method.

Background Art

[0002] The following Patent Document 1 describes a ventilation system for a house. This ventilation system includes an outside air intake provided in the foundation and taking in outside air into the underfloor space, and an air supply means for supplying the air in the underfloor space to the above-floor space. The air supply means includes an air intake opening in the underfloor space, a duct extending from this air intake through the underfloor space to the above-floor space side, and a filter for purifying the air passing through the duct.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, in summer, the temperature of the underfloor space tends to be lower than the outside air temperature. When such high-temperature and high-humidity outside air is supplied to such an underfloor space, the outside air is cooled in the underfloor space, and the relative humidity of the outside air may rise close to the dew condensation range. When the air in the underfloor space containing such outside air is purified by a filter, the filter absorbs moisture and the water content increases. For this reason, there has been a problem that the pressure loss of the filter increases and the ventilation rate of the above-floor space decreases.

[0005] The present invention has been devised in view of the above actual situation, and the main object thereof is to provide a ventilation system for a house capable of stabilizing the ventilation rate in summer.

Means for Solving the Problems

[0006] The present invention relates to a ventilation system for a house having a foundation heat insulation structure in which a heat insulating material is provided at a rising portion of a foundation. The house includes a space under the floor surrounded by the foundation and a living room adjacent to the space under the floor via a floor portion. The ventilation system includes a filter device for purifying air in the space under the floor, a supply air device including a fan for supplying the purified air in the space under the floor to the living room, an air conditioner provided in the living room and capable of at least cooling operation, an opening provided in the floor portion, an opening / closing device capable of opening and closing the opening, and a control device for driving the fan. The control device can switch between a first mode in which the opening is closed and the fan is operated at a first air volume when the cooling operation is not being performed, and a second mode in which the opening is opened and the fan is operated at a second air volume larger than the first air volume when the cooling operation is being performed.

Effects of the Invention

[0007] By adopting the above configuration, the ventilation system for a house of the present invention can achieve stabilization of the ventilation rate in summer.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be understood that the drawings include exaggerated expressions and expressions different from the dimensional ratios of actual structures in order to assist in understanding the content of the invention. Also, throughout each embodiment, the same or common elements are denoted by the same reference numerals, and redundant descriptions are omitted. Furthermore, the specific configurations shown in the embodiments and the drawings are for understanding the content of the present invention, and the present invention is not limited to the specific configurations shown.

[0010] [Residence] FIG. 1 is a conceptual diagram showing an example of a residence 2 in which a ventilation system 1 is installed. The residence 2 of the present embodiment is exemplified as a two-story building, but it may be a single-story building or a building with three or more stories. Also, the residence 2 of the present embodiment is configured as an industrialized housing having excellent airtightness performance and heat insulation performance. Thereby, it is possible to reduce the air-conditioning load of the air conditioner 23. Note that the residence 2 is not necessarily limited to such an industrialized housing.

[0011] The residence 2 of the present embodiment is configured to include a space under the floor 3 and a space above the floor 4 (living room 11).

[0012] [Space under the floor] The space under the floor 3 is surrounded by a foundation 5. The space under the floor 3 of the present embodiment is configured as a space surrounded by the foundation 5, the ground (earthen concrete) 6, and the floor portion 7 (the floor portion 7a of the lower floor).

[0013] The foundation 5 is configured as a strip foundation. Note that the foundation 5 is not necessarily limited to a strip foundation, and may be configured as, for example, a solid foundation (not shown). The foundation 5 of the present embodiment is arranged along the outer periphery of the residence 2 and is formed of reinforced concrete.

[0014] The foundation 5 of the present embodiment is configured to include a base portion 5a and a rising portion 5b. The rising portion 5b of the present embodiment is provided with a heat insulating material 8. Thereby, the residence 2 has a foundation heat insulation structure.

[0015] At the foundation 5 of the present embodiment, an air supply port 9 for taking in outside air Ao is provided. Therefore, the air in the underfloor space 3 (hereinafter sometimes referred to as "underfloor air") Au contains the outside air Ao. This underfloor air Au is heat-exchanged with the geothermal heat with little temperature change throughout the year and the ground (earthen floor concrete) 6. Furthermore, the house 2 of the present embodiment has a foundation insulation structure. For this reason, the house 2 of the present embodiment can store the underfloor air Au, which is cooler in summer and warmer in winter than the outside air Ao, in the underfloor space 3.

[0016] [Above-floor space] The above-floor space 4 is a space adjacent to the underfloor space 3 via the floor part 7 (the floor part 7a of the lower floor). The above-floor space 4 of the present embodiment includes a living room 11 and a non-living room 12. These living rooms 11 and non-living rooms 12 are partitioned by, for example, the floor part 7 (the floor part 7a of the lower floor and the floor part 7b of the upper floor), the outer wall 10, the ceiling part 13 (the ceiling part 13a of the lower floor and the ceiling part 13b of the upper floor), and the partition wall 14.

[0017] [Living room] The living room 11 of the present embodiment includes a living room 11a on the lower floor and a living room 11b on the upper floor. When the house 2 is a two-story building as in the present embodiment, the living room 11a on the lower floor is configured as the living room on the first floor, and the living room 11b on the upper floor is configured as the living room on the second floor.

[0018] [Non-living room] In the present embodiment, the non-living room 12 is enabled to communicate with the living room 11 in terms of air. Examples of the non-living room 12 include a bathroom, a dressing room (washroom), and a toilet (not shown).

[0019] The non-living room 12 of the present embodiment is partitioned by a partition wall 14 and a fitting 15 provided at the opening of the partition wall 14. The fitting 15 of the present embodiment is provided with an undercut that enables air to flow between the fitting 15 and the living room 11.

[0020] The non-residential room 12 of this embodiment includes the lower-floor non-residential room 12a and the upper-floor non-residential room 12b. When the house 2 is a two-story building as in this embodiment, the lower-floor non-residential room 12a is configured as the non-residential room on the first floor, and the upper-floor non-residential room 12b is configured as the non-residential room on the second floor.

[0021] [Inter-story space] An inter-story space 16 is provided in the floor space 4 of this embodiment. The inter-story space 16 of this embodiment is configured as a space partitioned between the floor part 7b of the upper floor and the ceiling part 13a of the lower floor.

[0022] [Ventilation system] The ventilation system 1 of the house in this embodiment (hereinafter sometimes referred to as the "ventilation system") is for ventilating the house 2. The ventilation system 1 of this embodiment includes a filter device 21, an air supply device 22, an air conditioner 23, an opening 24, an opening / closing device 25, and a control device 26. Further, in this embodiment, an exhaust device 27 and an inter-story air supply device 28 are included, but it is not particularly limited and may be omitted.

[0023] [Filter device] The filter device 21 is for purifying the under-floor air Au (outdoor air Ao). The filter device 21 of this embodiment includes a chamber box 21a and a filter member 21b.

[0024] The chamber box 21a of this embodiment is formed in a box shape having a space inside. The chamber box 21a is configured to allow the under-floor air Au to pass through the inside between an entrance and an exit (not shown).

[0025] The filter member 21b is disposed inside the chamber box 21a. With such a filter member 21b, the underfloor air Au passing through the inside of the chamber box 21a can be purified. In the present embodiment, a fibrous filter member 21b is adopted. As such a fibrous filter member 21b, for example, a HEPA (High Efficiency Particulate Air) filter is adopted, but it is not particularly limited.

[0026] [Air supply device] The air supply device 22 includes a fan (air supply fan) 22a. The air supply device 22 of the present embodiment further includes an air flow path 22b.

[0027] The fan (air supply fan) 22a is for supplying the purified underfloor air Au to the living room 11. In this specification, a "fan" is a machine for pumping air. Therefore, the fan 22a (including the lower floor fan 27a and the upper floor fan 27b of the exhaust device 27 described later) is not particularly limited as long as it can pump air.

[0028] The air supply device 22 of the present embodiment is configured by only one fan 22a, but is not limited to such a mode. For example, according to the volume of the inside of the house 2 (for example, the living room 11), a plurality of fans (not shown) may be included. Further, the fan 22a of the present embodiment is provided in the underfloor space 3, but is not necessarily limited to such a mode, and may be provided in the above-floor space 4, for example.

[0029] The fan 22a of the present embodiment is configured as a constant air volume fan whose rotation speed is controlled so as to have a constant air volume. In this case, by controlling the rotation speed of the fan 22a by the control device 26, the notch (air volume) can be switched. In this specification, the "air volume" is specified as the air volume per unit time (m 3 / h).

[0030] The fan 22a of the present embodiment is operable based on any one of a plurality of predetermined air volumes (notches). Thereby, the supply air volume of the outside air Ao by the fan 22a can be flexibly adjusted. The switching of the air volume (notch) is performed by the control device 26.

[0031] The plurality of air volumes of the present embodiment include a first air volume and a second air volume. Note that the plurality of air volumes are not limited to such a mode, and for example, other air volumes may be included.

[0032] The first air volume and the second air volume can be appropriately set according to the volume of the interior (for example, the living room 11) of the house 2 to be ventilated. The first air volume of the present embodiment is set based on the required ventilation rate (0.5 times / h) of the house 2. On the other hand, the second air volume is set to be larger than the first air volume.

[0033] The air flow path 22b communicates between the underfloor space 3 and the living room 11. The air flow path 22b of the present embodiment is configured as a duct, but is not limited to such a mode, and for example, it may be formed by the internal space of the partition wall 14.

[0034] A filter device 21 and a fan 22a are connected to one end side of the air flow path 22b of the present embodiment. The other end side of the air flow path 22b branches into a living room 11a on the lower floor and a living room 11b on the upper floor. Through such an air flow path 22b, the underfloor space 3 can communicate with the living room 11a on the lower floor and the living room 11b on the upper floor.

[0035] The air supply device 22 of the present embodiment makes the underfloor space 3 have a negative pressure by the operation of the fan 22a. Thereby, the outside air Ao is taken into the underfloor space 3 through the air supply port 9. The outside air Ao (underfloor air Au) taken into the underfloor space 3 is heat-exchanged with the ground heat. The underfloor air Au heat-exchanged with the ground heat is purified by the filter device 21. Then, the purified underfloor air is supplied (pressurized) to the living room 11 (including the living room 11a on the lower floor and the living room 11b on the upper floor) through the air flow path 22b. Thereby, the living room 11 can be ventilated.

[0036] [Air conditioner] The air conditioner 23 is provided in the living room 11 and is capable of at least cooling operation. By this cooling operation, the air (hereinafter sometimes referred to as "floor air") Ar in the living room 11 can be dehumidified. Note that the air conditioner 23 may be capable of operations such as heating operation in addition to the cooling operation.

[0037] The air conditioner 23 of the present embodiment is configured, for example, as a general household split-type air conditioner. The air conditioner 23 of the present embodiment includes a lower floor air conditioner 23a and an upper floor air conditioner 23b.

[0038] The lower floor air conditioner 23a is provided in the lower floor living room (the first floor living room) 11a. On the other hand, the upper floor air conditioner 23b is provided in the upper floor living room (the second floor living room) 11b. By these lower floor air conditioner 23a and upper floor air conditioner 23b, the lower floor living room 11a and the upper floor living room 11b can be individually air-conditioned. Note that the air conditioner 23 is not necessarily limited to such a mode, and the upper floor air conditioner 23b may be omitted according to the necessity of air conditioning or the like.

[0039] [Opening] The opening 24 is provided in the floor portion 7. The opening 24 of the present embodiment includes a lower floor opening 24a and an upper floor opening 24b.

[0040] The lower floor opening 24a is provided in the lower floor floor portion 7a. By such a lower floor opening 24a, the lower floor living room 11a and the underfloor space 3 can be communicated. The upper floor opening 24b is provided in the upper floor floor portion 7b. By such an upper floor opening 24b, the upper floor living room 11b and the inter-floor space 16 can be communicated.

[0041] [Opening and closing device] The opening / closing device 25 is for opening and closing the opening 24. The opening / closing device 25 of the present embodiment is configured as an opening / closing gallery. A known gallery can be adopted for the gallery. With such a gallery, it is possible to easily open and close the opening 24 with a simple configuration. Note that the opening / closing device 25 is not limited to an opening / closing gallery as long as it can open and close the opening 24.

[0042] The opening / closing device 25 of the present embodiment includes a lower floor opening / closing device 25a and an upper floor opening / closing device 25b.

[0043] The lower floor opening / closing device 25a is for opening and closing the lower floor opening 24a. When the lower floor opening / closing device 25a closes the lower floor opening 24a, the lower floor living room 11a and the underfloor space 3 can be blocked. On the other hand, when the lower floor opening / closing device 25a opens the lower floor opening 24a (as shown in FIG. 5), the lower floor living room 11a and the underfloor space 3 can be communicated.

[0044] The upper floor opening / closing device 25b is for opening and closing the upper floor opening 24b. When the upper floor opening / closing device 25b closes the upper floor opening 24b, the upper floor living room 11b and the intermediate floor 16 can be blocked. On the other hand, when the upper floor opening / closing device 25b opens the upper floor opening 24b, the upper floor living room 11b and the intermediate floor 16 can be communicated.

[0045] [Exhaust device] The exhaust device 27 of the present embodiment includes a fan (exhaust fan) for exhausting the air Ar above the floor to the outside 17. With such an exhaust device 27, the air Ar above the floor is exhausted (pumped) to the outside 17.

[0046] The exhaust device (fan) 27 of the present embodiment includes a lower floor fan 27a and an upper floor fan 27b. The lower floor fan 27a is provided on the outer wall 10 of the non-living room (non-living room on the first floor) 12a on the lower floor. The upper floor fan 27b is provided on the outer wall 10 of the non-living room (non-living room on the second floor) 12b on the upper floor. By these lower floor fan 27a and upper floor fan 27b, the air Ar above the floor on the lower floor and the air Ar above the floor on the upper floor can be exhausted independently.

[0047] The lower - floor fan 27a and the upper - floor fan 27b can be operated based on one air volume (single notch), but they may also be operated based on a plurality of air volumes. The air volumes of the lower - floor fan 27a and the upper - floor fan 27b can be appropriately set based on, for example, the required ventilation rate (0.5 times / h) for the house 2 and the total number of fans.

[0048] [Inter - floor air supply device] The inter - floor air supply device 28 of the present embodiment includes a fan 28a that can pump the air (air above the floor) Ar in the upper - floor living room 11b to the inter - floor space 16 through the upper - floor opening 24b. The fan 28a of the present embodiment is provided inside the inter - floor space 16, but is not particularly limited. For example, it may be provided in the upper - floor living room 11b. Also, the air volume of the fan 28a can be appropriately set. The air volume of the fan 28a of the present embodiment is set to be equal to or less than the air volume of the upper - floor fan 27b of the exhaust device 27.

[0049] [Problems in summer] As described above, the under - floor air Au exchanges heat with the geothermal heat with little temperature change throughout the year through the ground (dirt - floor concrete) 6. Therefore, in summer (for example, from June to September), the temperature of the under - floor space 3 tends to be lower than the outside air temperature. When such hot and humid outside air Ao is supplied to such an under - floor space 3, the outside air Ao is cooled in the under - floor space 3, and the relative humidity of the outside air Ao may rise close to the dew - point area. When the under - floor air Au containing such outside air Ao is purified by the filter device 21 described later, the filter device 21 absorbs moisture and the moisture content increases. In this case, the pressure loss of the filter device 21 increases, and the ventilation rate of the above - floor space 4 decreases (becomes unstable).

[0050] [Control device] In the ventilation system 1 of this embodiment, in summer, in order to stabilize the ventilation rate of the floor space 4, the above configuration including the fan 22a of the air supply device 22 is controlled by the control device 26. These controls are implemented based on the processing procedure of the ventilation method of the house (hereinafter sometimes referred to as the "ventilation method").

[0051] The control device 26 is for driving the fan (air supply fan) 22a of the air supply device 22. In this embodiment, the operation of the air conditioner 23, the opening / closing device 25, and the fans of the exhaust device 27 (the lower floor fan 27a and the upper floor fan 27b) is further controlled by the control device 26, but it is not particularly limited.

[0052] The control device 26 of this embodiment is composed of a computer 26A. The control device 26 is installed, for example, on the partition wall 14 or the like, but is not limited to such a mode. FIG. 2 is a conceptual diagram showing an example of the configuration of the control device 26.

[0053] The control device 26 of this embodiment includes an arithmetic device 31, a storage device 32 in which a processing procedure is stored, and a working memory 33 for reading the processing procedure and the like stored in the storage device 32. An input device 34 and an output device 35 are connected to the control device 26 (arithmetic device 31).

[0054] [Input device] The input device 34 is composed of an operation button, a touch panel, etc. provided on the housing of the control device 26 shown in FIG. 1. Information (data) input by, for example, a user (resident) or the like can be transmitted to the control device 26 by such an input device 34. The information input to this input device 34 includes, for example, the start and stop of the ventilation method executed in the ventilation system 1.

[0055] [Output device] The output device 35 is configured as a display provided in the housing of the control device 26 shown in FIG. 1. With such an output device 35, information (data) from the control device 26 can be received, and for example, the operating status of the ventilation system 1 or the like can be displayed.

[0056] [Arithmetic unit] As shown in FIG. 2, the arithmetic unit 31 of the present embodiment is configured by, for example, a CPU (Central Processing Unit).

[0057] The fan (supply air fan) 22a of the supply air device 22 is communicably connected to the arithmetic unit 31 (control device 26) of the present embodiment. Thereby, the operation of the fan 22a (for example, start and stop of operation, air volume, etc.) can be controlled by the arithmetic unit 31. Furthermore, data of the fan 22a (for example, current operating status (air volume), etc.) can be received by the arithmetic unit 31.

[0058] The air conditioner 23 (in this example, the lower floor air conditioner 23a and the upper floor air conditioner 23b) is communicably connected to the arithmetic unit 31 (control device 26) of the present embodiment. Thereby, the operation of the air conditioner 23 (for example, change of set temperature, etc.) can be controlled by the arithmetic unit 31. Furthermore, data regarding the operating status of the air conditioner 23 (heating and cooling operation modes, etc.) can be received by the arithmetic unit 31.

[0059] The opening / closing device 25 (in this example, the lower floor opening / closing device 25a and the upper floor opening / closing device 25b) is communicably connected to the arithmetic unit 31 (control device 26) of the present embodiment. Thereby, the arithmetic unit 31 can control the opening and closing of the opening 24 via the opening / closing device 25. Furthermore, data regarding the opening and closing state of the opening / closing device 25 (opening 24) can be received by the arithmetic unit 31.

[0060] In the arithmetic unit 31 (control device 26) of the present embodiment, fans (lower floor fan 27a and upper floor fan 27b) of the exhaust device 27 are communicably connected. Thereby, operations of the lower floor fan 27a and the upper floor fan 27b (for example, operation start and operation stop, etc.) can be controlled by the arithmetic unit 31. Further, data of the lower floor fan 27a and the upper floor fan 27b (for example, current operation status, etc.) can be received by the arithmetic unit 31.

[0061] In the arithmetic unit 31 (control device 26) of the present embodiment, a fan 28a of the inter - floor air supply device 28 is communicably connected. Thereby, the operation of the fan 28a (for example, operation start and operation stop, etc.) can be controlled by the arithmetic unit 31. Further, data of the fan 28a (for example, current operation status, etc.) can be received by the arithmetic unit 31.

[0062] [Storage device] The storage device 32 of the present embodiment is, for example, a non - volatile information storage device. The storage device 32 includes a data section 36 and a program section 37.

[0063] [Data section] The data section 36 is for storing calculation results and the like by the arithmetic unit 31 (control device 26). The data section 36 of the present embodiment includes a first input section 36a and a second input section 36b. Note that the data section 36 is not necessarily limited to such a mode. For example, the data section 36 may further include an input section for storing other information. Details of the data stored in these data sections 36 will be described later.

[0064] [Program section] The program section 37 is a program (computer program) for causing the arithmetic unit 31 (control device 26) to execute the ventilation method of the present embodiment. When the program section (program) 37 is executed by the arithmetic unit 31, the control device 26 can be made to function as a specific means.

[0065] The program section 37 of the present embodiment includes a first determination section 37a, a second determination section 37b, a first switching section 37c, and a second switching section 37d. Further, the program section 37 includes a first operation section 37e, a second operation section 37f, a third operation section 37g, a fourth operation section 37h, an end determination section 37i, and an end section 37j. The program section 37 is not limited to such a mode, and some of these programs may be omitted, or other programs may be further included. The functions of these program sections 37 will be described in each step of the ventilation method described later.

[0066] [Ventilation method for a house (First Embodiment)] In the ventilation system 1 of the present embodiment, based on a predetermined processing procedure of the ventilation method, the interior of the house 2 shown in FIG. 1 (including the living room 11 and the non-living room 12) is ventilated. FIG. 3 is a flowchart showing an example of the processing procedure of the ventilation method for a house.

[0067] [Perform ventilation operation (ventilation step)] In the ventilation method of the present embodiment, first, the control device 26 shown in FIG. 1 performs a ventilation operation (ventilation step S1). In the ventilation step S1, the house 2 is ventilated using the ventilation system 1. FIG. 4 is a flowchart showing an example of the processing procedure of the ventilation step S1.

[0068] [Determine whether cooling operation is being performed by the lower floor air conditioner] In the ventilation step S1 of the present embodiment, first, the control device 26 shown in FIGS. 1 and 2 determines whether a cooling operation is being performed by the air conditioner 23 (step S11). When a plurality of air conditioners 23 are included as in the present embodiment, it is determined whether a cooling operation is being performed by the air conditioner 23 (in this example, the lower floor air conditioner 23a) provided in the living room 11 (the lower floor living room 11a) adjacent to the underfloor space 3.

[0069] In step S11 of this embodiment, the first determination unit 37a included in the program unit 37 is read into the working memory 33. The first determination unit 37a is a program for determining whether or not the cooling operation is being performed by the air conditioner 23 (the lower floor air conditioner 23a). By executing this first determination unit 37a by the arithmetic unit 31, the control device 26 can function as means for determining whether or not the cooling operation is being performed.

[0070] Whether or not the cooling operation is being performed by the lower floor air conditioner 23a is appropriately determined. In this embodiment, based on the data regarding the operation status (such as the cooling / heating operation mode) of the lower floor air conditioner 23a received by the arithmetic unit 31, it is determined whether or not the cooling operation is being performed. The determination result is stored in the first input unit 36a shown in FIG. 2.

[0071] [Switching between the first mode and the second mode] Next, in the ventilation step S1 of this embodiment, the control device 26 shown in FIGS. 1 and 2 switches between the first mode S13 and the second mode S14 (step S12) based on the determination result as to whether or not the cooling operation is being performed by the air conditioner 23 (the lower floor air conditioner 23a).

[0072] In step S12 of this embodiment, first, the determination result in step S11 stored in the first input unit 36a shown in FIG. 2 and the first switching unit 37c included in the program unit 37 are read into the working memory 33. The first switching unit 37c is a program for switching between the first mode S13 and the second mode S14 based on the determination result in step S11 (whether or not the cooling operation is being performed by the lower floor air conditioner 23a). By executing this first switching unit 37c by the arithmetic unit 31, the control device 26 can function as means for switching between the first mode S13 and the second mode S14.

[0073] In step S12, if it is determined that the cooling operation by the lower floor air conditioner 23a is not being performed (in step S12, "No"), the process switches to (executes) the first mode S13. On the other hand, in step S12, if it is determined that the cooling operation is being performed (in step S12, "Yes"), the process switches to (executes) the second mode S14.

[0074] [First Mode] FIG. 1 shows an example of a house 2 in which the ventilation system 1 is operating in the first mode. In the ventilation step S1 of the present embodiment, the control device 26 executes the first mode S13 in which the opening 24 (lower floor opening 24a) is closed and the fan 22a of the air supply device 22 is operated at the first air volume. The first mode S13 is executed when the cooling operation by the lower floor air conditioner 23a is not being performed (in step S12, "No").

[0075] In the first mode S13 of the present embodiment, first, the first operation unit 37e included in the program unit 37 shown in FIG. 2 is read into the work memory 33. The first operation unit 37e is a program for executing the first mode S13. By this first operation unit 37e being executed by the arithmetic unit 31, the control device 26 can function as means for executing the first mode S13.

[0076] In the first mode S13 of the present embodiment, the first operation unit 37e (control device 26) shown in FIG. 2 closes the opening 24 (in this example, the lower floor opening 24a) via the opening / closing device 25 (lower floor opening / closing device 25a) shown in FIG. 1. Further, the first operation unit 37e (control device 26) shown in FIG. 2 operates the fan 22a of the air supply device 22 shown in FIG. 1 at the first air volume. Thereby, in the first mode S13, the lower floor opening 24a is closed and the fan 22a is operated at the first air volume.

[0077] In the first mode S13, when the lower floor opening 24a is closed, the floor air Ar in the floor space 4 including the lower floor living room 11a is prevented from being supplied to the underfloor space 3. As a result, a decrease in the effective ventilation volume due to the inclusion of the floor air Ar (i.e., air other than the outside air Ao) in the underfloor air Au for ventilation is suppressed.

[0078] Furthermore, in summer, the supply of the hot and humid floor air Ar, in which the cooling operation by the lower floor air conditioner 23a is not being performed, to the underfloor space 3 is prevented. Thereby, an increase in the moisture content rate of the filter device 21 is suppressed, and a decrease in the ventilation rate accompanying an increase in the pressure loss of the filter device 21 is prevented.

[0079] As described above, the first air volume of the present embodiment is set based on the ventilation rate (0.5 times / h) required for the house 2. Based on such a first air volume, when the fan 22a of the air supply device 22 is operated, the floor space 4 (including the living room 11 and the non-living room 12) can be efficiently ventilated using the underfloor air Au (outside air Ao) purified by the filter device 21. Further, since the underfloor air Au is heat-exchanged with the ground heat, the comfort of the living room 11 can be improved while the air-conditioning load of the air conditioner 23 can be reduced.

[0080] In the first mode S13 of the present embodiment, the first operation unit 37e (control device 26) shown in FIG. 2 operates the fans (the lower floor fan 27a and the upper floor fan 27b) of the exhaust device 27 shown in FIG. 1. Thereby, in the first mode S13, since the ventilation system 1 is configured as the first type of ventilation in which air supply and exhaust are mechanically performed, air supply and exhaust can be stably performed, and efficient ventilation becomes possible.

[0081] [Second mode] FIG. 5 is a conceptual diagram showing an example of the house 2 while the ventilation system 1 is operating in the second mode and the fourth mode. In the ventilation step S1 of the present embodiment, the control device 26 executes the second mode S14 in which the opening 24 (the lower floor opening 24a) is opened and the fan 22a of the air supply device 22 is operated at the second air volume. The second mode S14 is executed when the cooling operation by the lower floor air conditioner 23a is being performed (Yes in step S12).

[0082] In the second mode S14 of the present embodiment, first, the second operation unit 37f included in the program unit 37 shown in FIG. 2 is read into the work memory 33. The second operation unit 37f is a program for executing the second mode S14. By the second operation unit 37f being executed by the arithmetic unit 31, the control device 26 can function as means for executing the second mode S14.

[0083] In the second mode S14 of the present embodiment, the second operation unit 37f (control device 26) shown in FIG. 2 opens the opening 24 (in this example, the lower floor opening 24a) via the opening / closing device 25 (the lower floor opening / closing device 25a) shown in FIG. 5. Further, the second operation unit 37f (control device 26) operates the fan 22a of the air supply device 22 at the second air volume. Thereby, in the second mode S14, the lower floor opening 24a is opened and the fan 22a is operated at the second air volume.

[0084] In the second mode S14, since the lower floor opening 24a is opened, the floor air Ar (cooling air Ac) in the lower floor living room 11a dehumidified by the cooling operation is supplied to the underfloor space 3, so that the underfloor space 3 is dehumidified. As a result, the moisture content of the filter device 21, which is likely to increase in summer, decreases, and a decrease in the ventilation rate of the floor space 4 due to an increase in the pressure loss of the filter device 21 is prevented. In the present embodiment, since the underfloor space 3 is under negative pressure by the operation of the fan 22a of the air supply device 22, for example, even if a fan (not shown) is not separately provided at the lower floor opening 24a, the floor air Ar can be smoothly supplied to the underfloor space 3.

[0085] Furthermore, in the second mode S14, since the fan 22a of the air supply device 22 is operated at a second air volume larger than the first air volume, a large amount of outside air Ao is taken into the underfloor space 3. As a result, a decrease in the ventilation rate due to the supply of the floor air Ar to the underfloor space 3 through the lower floor opening 24a is prevented. Thereby, the ventilation system 1 of the present embodiment can stabilize the ventilation rate of the floor space 4 in summer.

[0086] In the present embodiment, since the underfloor space 3 can be dehumidified using the air conditioner 23 (in this example, the lower floor air conditioner 23a) provided in the living room 11, for example, it is not necessary to separately provide a dehumidifying device (not shown) in the underfloor space 3. Therefore, the ventilation system 1 of the present embodiment can reduce the initial cost, maintenance cost, and running cost.

[0087] The second air volume is preferably set based on the decrease in the effective ventilation volume accompanying the supply of the floor air Ar to the underfloor space 3 through the lower floor opening 24a. Thereby, it becomes possible to ventilate the floor space 4 based on the ventilation rate required for the house 2. From such a viewpoint, the second air volume of the present embodiment can be set to 1.1 to 1.5 times the first air volume.

[0088] In the second mode S14 of the present embodiment, the second operation unit 37f (control device 26) shown in FIG. 2 operates the fans (lower floor fan 27a and upper floor fan 27b) of the exhaust device 27 shown in FIG. 5. Thereby, in the second mode S14, the ventilation system 1 can be configured as the first type of ventilation in which air supply and exhaust are mechanically performed, so that air supply and exhaust can be stably performed and efficient ventilation can be achieved.

[0089] [Determine whether cooling operation is being performed by the upper floor air conditioner] Next, in the ventilation process S1 of the present embodiment, the control device 26 shown in FIG. 1 determines whether or not cooling operation is being performed by the upper floor air conditioner 23b (step S15).

[0090] In step S15 of the present embodiment, the second determination unit 37b included in the program unit 37 shown in FIG. 2 is read into the working memory 33. The second determination unit 37b is a program for determining whether or not the upper-floor air conditioner 23b is performing a cooling operation. By executing this second determination unit 37b by the arithmetic unit 31, the control device 26 can function as a means for determining whether or not a cooling operation is being performed.

[0091] Whether or not the upper-floor air conditioner 23b is performing a cooling operation is appropriately determined. In the present embodiment, based on the data regarding the operation status (such as the cooling / heating operation mode) of the upper-floor air conditioner 23b received by the arithmetic unit 31, it is determined whether or not a cooling operation is being performed. The determination result is stored in the second input unit 36b shown in FIG. 2.

[0092] [Switching between the third mode and the fourth mode] Next, in the ventilation step S1 of the present embodiment, the control device 26 shown in FIGS. 1 and 2 switches between the third mode S17 and the fourth mode S18 (step S16) based on the determination result as to whether or not the upper-floor air conditioner 23b is performing a cooling operation.

[0093] In step S16 of the present embodiment, first, the determination result in step S15 stored in the second input unit 36b shown in FIG. 2 and the second switching unit 37d included in the program unit 37 are read into the working memory 33. The second switching unit 37d is a program for switching between the third mode S17 and the fourth mode S18 based on the determination result in step S15 (whether or not the upper-floor air conditioner 23b is performing a cooling operation). By executing this second switching unit 37d by the arithmetic unit 31, the control device 26 can function as a means for switching between the third mode S17 and the fourth mode S18.

[0094] In step S16, when it is determined that the cooling operation by the upper floor air conditioner 23b is not being performed (No in step S16), the process switches to (executes) the third mode S17. On the other hand, in step S16, when it is determined that the cooling operation is being performed (Yes in step S16), the process switches to (executes) the fourth mode S18.

[0095] [Third Mode] FIG. 1 shows an example of a house 2 in which the ventilation system 1 is operating in the third mode. In the ventilation step S1 of the present embodiment, the control device 26 executes the third mode S17 in which the upper floor opening 24b is closed. The third mode S17 is executed when the cooling operation by the upper floor air conditioner 23b is not being performed (No in step S16).

[0096] In the third mode S17 of the present embodiment, first, the third operation unit 37g included in the program unit 37 shown in FIG. 2 is read into the work memory 33. The third operation unit 37g is a program for executing the third mode S17. By the third operation unit 37g being executed by the arithmetic unit 31, the control device 26 can function as means for executing the third mode S17.

[0097] In the third mode S17 of the present embodiment, the third operation unit 37g (control device 26) shown in FIG. 2 closes the upper floor opening 24b via the upper floor opening / closing device 25b shown in FIG. 1. As a result, in the third mode S17, the floor air Ar in the floor space 4 including the upper floor living room 11b is prevented from being supplied to the floor between floors 16. In particular, in summer, since the high-temperature and high-humidity floor air Ar in which the cooling operation by the upper floor air conditioner 23b is not being performed is prevented from being supplied to the floor between floors 16, condensation in the floor between floors 16 is prevented.

[0098] [Fourth Mode] In FIG. 5, an example of a house 2 in which the ventilation system 1 is operating in the fourth mode is shown. In the ventilation process S1 of the present embodiment, the control device 26 executes the fourth mode S18 in which the upper floor opening 24b is opened. The fourth mode S18 is executed when the cooling operation by the upper floor air conditioner 23b is being performed (Yes in step S16).

[0099] In the fourth mode S18 of the present embodiment, first, the fourth operation unit 37h included in the program unit 37 shown in FIG. 2 is read into the work memory 33. The fourth operation unit 37h is a program for executing the fourth mode S18. By this fourth operation unit 37h being executed by the arithmetic unit 31, the control device 26 can function as means for executing the fourth mode S18.

[0100] In the fourth mode S18 of the present embodiment, the fourth operation unit 37h (control device 26) shown in FIG. 2 opens the upper floor opening 24b via the upper floor opening / closing device 25b shown in FIG. 5. As a result, in the fourth mode S18, the floor air Ar (cooling air Ac) of the upper floor living room 11b dehumidified by the cooling operation is supplied to the floor space 16, so that the floor space 16 is dehumidified. Therefore, condensation in the floor space 16 is prevented. In particular, when, for example, a ceiling-embedded air conditioner (not shown) or the like is arranged inside the floor space 16, condensation that easily occurs in the cooled portions (for example, refrigerant pipes and air outlets) of the ceiling-embedded air conditioner during the cooling operation can be effectively prevented.

[0101] The fourth mode S18 preferably includes a step of pumping the floor air Ar (cooling air Ac) of the upper floor living room 11b through the upper floor opening 24b into the floor space 16. In this step, the fourth operation unit 37h (control device 26) shown in FIG. 2 operates the fan 28a of the floor space air supply device 28 shown in FIG. 5. As a result, the floor air Ar of the upper floor living room 11b dehumidified by the cooling operation is smoothly supplied (pumped) into the floor space 16 through the upper floor opening 24b, so that condensation in the floor space 16 is effectively prevented.

[0102] The floor air Ar supplied to the intermediate floor 16 is discharged to the outdoors 17 from gaps or the like in the intermediate floor 16. Therefore, in the fourth mode S18, a decrease in ventilation efficiency can be suppressed. Note that an exhaust fan (not shown) may be separately provided in the intermediate floor 16.

[0103] [Determine whether there is an instruction to end ventilation] Next, in the ventilation method of the present embodiment, as shown in FIG. 3, the control device 26 shown in FIGS. 1 and 2 determines whether there is an instruction to end ventilation (step S2). The determination in step S2 can be performed, for example, at time intervals of 1 to 60 minutes.

[0104] Step S2 of the present embodiment is read into the working memory 33 by the end determination unit 37i included in the program unit 37 shown in FIG. 2. The end determination unit 37i is a program for determining whether there is an instruction to end ventilation. By executing this end determination unit 37i by the arithmetic unit 31, the control device 26 can function as means for determining whether there is an instruction to end ventilation.

[0105] The determination of whether there is an instruction to end ventilation is made, for example, based on instruction data input by a user (resident) or the like to the input device 34, or the occurrence of an abnormal end such as an interrupt process.

[0106] In the present embodiment, when it is determined that there is an instruction to end ventilation (Yes in step S2), step S3 for ending ventilation is performed. On the other hand, when it is determined that there is no instruction to end ventilation (No in step S2), ventilation steps S1 and S2 are performed again.

[0107] The ventilation method (ventilation system 1) and the house 2 of the present embodiment are switched between the first mode S13 shown in FIG. 1 and the second mode S14 shown in FIG. 5 according to the summer when the cooling operation is performed and the winter when the cooling operation is not performed until an instruction to end the ventilation is given. As a result, the moisture content of the filter device 21 can be maintained in a low state, so that a decrease in the ventilation rate due to an increase in the pressure loss of the filter device 21 is prevented. Further, when switched to the second mode S14, the fan 22a of the air supply device 22 is operated at a second air volume larger than the first air volume, so that a decrease in the ventilation rate due to the supply of the floor air Ar to the underfloor space 3 is prevented. Therefore, the ventilation method (ventilation system 1) and the house 2 of the present embodiment can achieve stabilization of the ventilation rate throughout the year.

[0108] Furthermore, in the ventilation method (ventilation system 1) and the house 2 of the present embodiment, until an instruction to end the ventilation is given, the third mode S17 shown in FIG. 1 and the fourth mode S18 shown in FIG. 5 are switched according to the summer when the cooling operation is performed and the winter when the cooling operation is not performed. Thereby, the ventilation method (ventilation system 1) and the house 2 of the present embodiment can prevent condensation in the inter-floor space 16 throughout the year.

[0109] [End ventilation] Next, in the ventilation method of the present embodiment, when the determination in step S2 shown in FIG. 3 is affirmative, the control device 26 shown in FIG. 2 ends the ventilation (step S3).

[0110] In step S3 of the present embodiment, first, the end part 37j included in the program part 37 shown in FIG. 2 is read into the work memory 33. This end part 37j is a program for ending the ventilation of the house 2 by the ventilation system 1. By executing this end part 37j by the arithmetic unit 31, the control device 26 can function as a means for ending the ventilation.

[0111] In step S3 of the present embodiment, the end portion 37j (control device 26) terminates the operations of the fan 22a of the air supply device 22 shown in FIG. 1, the fans of the exhaust device 27 (lower floor fan 27a and upper floor fan 27b), and the fan 28a of the inter-floor air supply device 28. Thereby, the ventilation of the house 2 by the ventilation system 1 is terminated.

[0112] [Ventilation method for a house (Second Embodiment)] In the previous embodiments, the control device 26 shown in FIG. 2 automatically opened and closed the lower floor opening 24a and the upper floor opening 24b via the lower floor opening / closing device 25a and the upper floor opening / closing device 25b, but it is not limited to such a mode. For example, based on an opening / closing instruction from the control device 26, an occupant or the like may manually open and close the lower floor opening 24a and the upper floor opening 24b via the lower floor opening / closing device 25a and the upper floor opening / closing device 25b. Such an opening / closing instruction may be output to the output device 35 based on the determination result of whether or not the cooling operation is being performed by the air conditioner 23 (lower floor air conditioner 23a and upper floor air conditioner 23b).

[0113] In this way, in the present embodiment, when the lower floor opening / closing device 25a and the upper floor opening / closing device 25b are manually opened and closed by an occupant or the like, the configuration of the ventilation system 1 including the lower floor opening / closing device 25a and the upper floor opening / closing device 25b can be simplified while stabilizing the ventilation rate.

[0114] [Ventilation method for a house (Third Embodiment)] In the ventilation methods of the previous embodiments, the third mode S17 shown in FIG. 1 and the fourth mode S18 shown in FIG. 5 were switched based on the result of whether or not the cooling operation was being performed by the upper floor air conditioner 23b, but it is not limited to such a mode. For example, when there is no inter-floor space 16 in the house 2 or when the possibility of condensation occurring in the inter-floor space 16 is low, the switching between the third mode S17 and the fourth mode S18 may be omitted. Thereby, in summer, while stabilizing the ventilation rate, the configuration of the ventilation system 1 can be simplified.

[0115] As described above in detail with respect to the particularly preferred embodiments of the present invention, the present invention is not limited to the illustrated embodiments and can be implemented in various forms with modifications.

[0116] [Appendix] The present invention includes the following aspects.

[0117] [Invention 1] A ventilation system for a house having a foundation heat insulation structure in which a heat insulating material is provided at the rising portion of the foundation, wherein the house includes a sub-floor space surrounded by the foundation and a living room adjacent to the sub-floor space via a floor portion, the ventilation system includes a filter device for purifying the air in the sub-floor space, a supply air device including a fan for supplying the purified air in the sub-floor space to the living room, an air conditioner provided in the living room and capable of at least cooling operation, an opening provided in the floor portion, an opening / closing device capable of opening and closing the opening, and a control device for driving the fan, the control device has a first mode in which the opening is closed and the fan is operated at a first air volume when the cooling operation is not being performed, and a second mode in which the opening is opened and the fan is operated at a second air volume larger than the first air volume when the cooling operation is being performed, and is switchable between the two modes, A ventilation system for a house. [Invention 2] The ventilation system for a house according to Invention 1, wherein the first air volume is set based on the ventilation rate required for the house. [Invention 3] The ventilation system for a house according to Invention 1 or 2, wherein the second air volume is set based on the reduction in the effective ventilation volume associated with the supply of air from the living room to the sub-floor space through the opening. [Invention 4] The opening / closing device is a ventilation system for a house according to any one of Inventions 1 to 3, including an opening / closing type gallery. [Invention 5] The house includes an inter-story space that is a space partitioned between the floor of the upper story and the ceiling of the lower story. The ventilation system An upper-story air conditioner provided in the upper-story living room and capable of at least cooling operation, An upper-story opening provided in the floor of the upper story, The ventilation system for a house according to any one of Inventions 1 to 4, further including an upper-story opening / closing device capable of opening and closing the upper-story opening. The control device A third mode of closing the upper-story opening when the cooling operation is not being performed in the upper-story living room, A fourth mode of opening the upper-story opening when the cooling operation is being performed in the upper-story living room, and is switchable to these modes. The ventilation system for a house according to any one of Inventions 1 to 4. [Invention 6] The ventilation system for a house according to Invention 5, further including a fan capable of pumping the air in the upper-story living room through the upper-story opening into the inter-story space in the fourth mode. [Invention 7] A house equipped with the ventilation system according to any one of Inventions 1 to 6. [Invention 8] A ventilation method for a house having a foundation heat insulation structure in which a heat insulating material is provided at the rising portion of the foundation, The house includes an under-floor space surrounded by the foundation and a living room adjacent to the under-floor space via a floor. The ventilation method includes a ventilation step of ventilating the house using a ventilation system. The ventilation system A filter device for purifying the air in the under-floor space, An air supply device including a fan for supplying the purified air in the under-floor space to the living room, An air conditioner provided in the living room and capable of at least cooling operation, An opening provided in the floor, An opening / closing device capable of opening and closing the opening, and The ventilation process includes A first mode in which, when the cooling operation is not being performed, the opening is closed and the fan is operated at a first air volume; A step of switching to a second mode in which, when the cooling operation is being performed, the opening is opened and the fan is operated at a second air volume greater than the first air volume. The ventilation method for a house includes A ventilation method for a house. [Invention 9] The ventilation method for a house according to Invention 8, wherein the first air volume is set based on the number of ventilation times required for the house. [Invention 10] The ventilation method for a house according to Invention 8 or 9, wherein the second air volume is set based on a reduction in the effective ventilation volume associated with the supply of air from the living room to the underfloor space through the opening. [Invention 11] The house includes an inter - floor space that is a space partitioned between the floor of the upper floor and the ceiling of the lower floor. The ventilation system includes An upper - floor air conditioner provided in the upper - floor living room and capable of at least cooling operation; An upper - floor opening provided in the floor of the upper floor; An upper - floor opening / closing device capable of opening and closing the upper - floor opening, and further includes The ventilation process includes A third mode in which, when the cooling operation is not being performed in the upper - floor living room, the upper - floor opening is closed; A step of switching to a fourth mode in which, when the cooling operation is being performed in the upper - floor living room, the upper - floor opening is opened. The ventilation method for a house according to any one of Inventions 8 to 10 includes [Invention 12] The ventilation method for a house according to Invention 11, wherein the fourth mode includes a step of pumping the air in the upper - floor living room into the inter - floor space through the upper - floor opening.

Explanation of Signs

[0118] 1 Ventilation system 2 House 3 Under-bed space 11 Bedroom 21 Filter device 22 Air supply device 22a Fan 23 Air conditioner 24 Opening 25 Opening / closing device 26 Control device

Claims

1. A ventilation system for a house having a foundation heat insulation structure in which a heat insulating material is provided at a rising portion of the foundation, wherein the house includes a sub-floor space surrounded by the foundation and a living room adjacent to the sub-floor space via a floor portion, and the ventilation system includes a filter device for purifying the air in the sub-floor space, a supply air device having a fan for supplying the purified air in the sub-floor space to the living room, an air conditioner provided in the living room and capable of at least cooling operation, an opening provided in the floor portion, an opening / closing device capable of opening and closing the opening, and a control device for driving the fan, wherein the control device is capable of switching to a first mode in which the opening is closed and the fan is operated at a first air volume when the cooling operation is not being performed, and a second mode in which the opening is opened and the fan is operated at a second air volume larger than the first air volume when the cooling operation is being performed, A ventilation system for a house.

2. The ventilation system for a house according to claim 1, wherein the first air volume is set based on the number of ventilation times required for the house.

3. The ventilation system for a house according to claim 1, wherein the second air volume is set based on a reduction in the effective ventilation volume associated with the supply of air from the living room to the sub-floor space through the opening.

4. The ventilation system for a house according to claim 1, wherein the opening / closing device includes an opening / closing type gallery.

5. The house includes an intermediate floor which is a space partitioned between an upper floor portion and a lower floor ceiling portion, and the ventilation system further includes an upper floor air conditioner provided in the upper floor living room and capable of at least cooling operation, an upper floor opening provided in the upper floor portion, and an upper floor opening / closing device capable of opening and closing the upper floor opening, wherein the control device is capable of switching to a third mode in which the upper floor opening is closed when the cooling operation is not being performed in the upper floor living room, and a fourth mode in which the upper floor opening is opened when the cooling operation is being performed in the upper floor living room,

6. The ventilation system for a house according to claim 5, further including a fan capable of pumping the air in the upper floor living room through the upper floor opening into the intermediate floor in the fourth mode.

7. A house including the ventilation system according to any one of claims 1 to 6.

8. A ventilation method for a house having a foundation heat insulation structure in which a heat insulating material is provided at a rising portion of the foundation, wherein the house includes a space under the floor surrounded by the foundation and a living room adjacent to the space under the floor via a floor portion, the ventilation method includes a ventilation step of ventilating the house using a ventilation system, the ventilation system includes a filter device for purifying the air in the space under the floor, a supply air device including a fan for supplying the purified air in the space under the floor to the living room, an air conditioner provided in the living room and capable of at least cooling operation, an opening provided in the floor portion, and an opening / closing device capable of opening and closing the opening, the ventilation step includes a first mode in which when the cooling operation is not performed, the opening is closed and the fan is operated at a first air volume, and a step of switching to a second mode in which when the cooling operation is performed, the opening is opened and the fan is operated at a second air volume larger than the first air volume, A ventilation method for a house.

9. The ventilation method for a house according to claim 8, wherein the first air volume is set based on the number of ventilation times required for the house.

10. The ventilation method for a house according to claim 8, wherein the second air volume is set based on a decrease in the effective ventilation volume accompanying the supply of the air in the living room to the space under the floor through the opening.

11. The house includes a space between the floor of the upper floor and the ceiling of the lower floor, which is a space partitioned therebetween, the ventilation system includes an upper floor air conditioner provided in the living room on the upper floor and capable of at least cooling operation, an upper floor opening provided in the floor of the upper floor, and an upper floor opening / closing device capable of opening and closing the upper floor opening, the ventilation step includes a third mode in which when the cooling operation is not performed in the living room on the upper floor, the upper floor opening is closed, and a step of switching to a fourth mode in which when the cooling operation is performed in the living room on the upper floor, the upper floor opening is opened, according to the ventilation method for a house according to claim 8.

12. The ventilation method for a house according to claim 11, wherein the fourth mode includes a step of pumping the air in the living room on the upper floor through the upper floor opening into the space between the floors.

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