JP2001140370A - Ventilating structure of house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the efficiencies for indoor heat retention and for heat insulation by making effective use of the quantity of heat of indoor air exhausted to the outside during ventilation. SOLUTION: In a ventilating structure S of a house, an exterior wall 3 provided on a foundation 1, together with a floor 2, includes an inner heat insulating wall 4 and a surface wall 5 provided on the outside of the heat insulating wall 4, with a ventilating layer 6 formed between the heat insulating wall 4 and the surface wall 5 to introduce indoor air into the ventilating layer 6 from the lower end 6a of the ventilating layer 6. The structure S has an inlet passage 10 for introducing outside air into a room surrounded by the exterior walls 3 and an exhaust passage 20 through which indoor air is exhausted. The exhaust passage 20 is formed to communicate with the lower end 6a of the ventilating layer 6 to allow the indoor air to flow into the ventilating layer 6, and a heat exchanger 15 for the exchange of heat between the indoor air and the outside air is provided between the exhaust passage 20 and the inlet passage 10 so that the outside air subjected to heat exchange with the indoor air is introduced into the room.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation structure for a house having excellent heat insulating properties, and more particularly, to a ventilation structure for a house having a ventilation layer on an outer wall for introducing outside air into a room and discharging inside air to the outside. About.

[0002]

2. Description of the Related Art Conventionally, as a ventilation structure of a house, for example, an outer wall provided with a floor on a foundation is provided with an inner heat insulating wall and a surface wall provided outside the heat insulating wall,
A ventilation layer is formed between the heat insulating wall and the surface wall, air is introduced into the ventilation layer from the lower end of the ventilation layer, and a discharge path for discharging indoor air enclosed by the outer wall and outside air are introduced indoors. For example, there is an airflow path having an introduction path, in which outside air is introduced into a room under the floor, inside air flows into a ventilation layer, and indoor air is exhausted and ventilated. This warms (or cools) the outside air under the floor and introduces the warmed (or chilled) air into the room while the warmed (or chilled) room air enters the ventilation layer. Because it is exhausted, the heat on the indoor (or outdoor) side is less likely to be transmitted to the low (or high) temperature outside air (or inside air), and the heat insulation of the outer wall is improved, and the heated (or cooled) air Can keep the room warm. Therefore, in a house in a cold region, the occurrence of dew condensation inside the outer wall is also prevented.

[0003]

By the way, in the above-mentioned conventional ventilation structure for a house, it is not possible to allow the outside air to stay under the floor and to warm (or reduce) the temperature to some extent before introducing the outside air into the house. Although the temperature under the floor is somewhat warm (or cold), if the outside air is introduced into the room as it is, the temperature inside the room will drop (or rise), so the outside air must be heated (or cooled) in advance. There is a request to introduce it indoors. Also, during ventilation, indoor warm air (or cold air) is exhausted outside as it is,
There is a demand that the amount of warm (or cold) heat be used as effectively as possible. For example, when it is described in winter in a cold region, when the outside air temperature is, for example, minus 5 ° C. and the inside air temperature is heating, for example, 20 ° C., when outside air is introduced indoors under the floor, the outside air is about −4 ° C. under the floor. It is heated and introduced indoors. When the outside air is introduced, the inside air temperature keeps decreasing. Therefore, in order to keep the indoor temperature at 20 ° C., considerable heating is required indoors, and the heating efficiency is reduced. In addition, indoor warm air of 20 ° C. is exhausted to the outside, and the amount of indoor heat is released to the outside unnecessarily. The present invention has been made in view of such problems, and has a ventilation structure for a house in which indoor heat released outside during ventilation is effectively used to improve indoor heat retention and heat insulation. The purpose is to provide.

[0004]

The technical means of the present invention for solving such a problem is to provide an outer wall provided with a floor on a foundation with an inner heat insulating wall and a surface wall provided outside the heat insulating wall. A ventilation layer is formed between the heat insulating wall and the surface wall, and air is introduced into the ventilation layer from the lower end of the ventilation layer. In a ventilation structure of a house having an introduction path for introducing outside air and a discharge path for discharging the indoor air, the discharge path communicates with a lower end of the ventilation layer to allow the inside air to flow into the ventilation layer, A heat exchanger for performing heat exchange between the inside air and the outside air is provided between the discharge path and the introduction path,
The heat exchanged outside air was introduced indoors. The outside air flows through the introduction path and the inside air flows into the heat exchanger through the discharge path, and heat exchange is performed according to the temperature difference between the outside air and the inside air that have flowed. The heat-exchanged outside air is introduced indoors, and the heat-exchanged inside air flows into the ventilation layer from the lower end of the ventilation layer and is discharged.

For example, when the temperature of the outside air is lower than that of the inside air,
Outside air flows into the heat exchanger from the introduction path. Outside air that has flowed into the heat exchanger is indirectly heat-exchanged with inside air that has been taken in from the discharge path. In the heat exchanger, the temperature of the outside air is lower than the temperature of the inside air, so that it is heated. Conversely, the inside air is cooled by heat exchange. The inside air flowing out of the heat exchanger flows into the ventilation layer while having a temperature higher than the outdoor temperature. Therefore, even if the surface wall is cooled by the outdoor temperature, the temperature of the air flowing through the ventilation layer is lower than the indoor temperature and higher than the outdoor temperature, so that a temperature difference is generated stepwise from inside to outside. Conversely, when the temperature of the outside air is higher than the inside air, the outside air flows into the heat exchanger from the introduction path. The outside air that has flowed into the heat exchanger is reduced in the heat exchanger because the temperature of the outside air is higher than the temperature of the inside air. Conversely, the inside air is heated by heat exchange. The inside air flowing out of the heat exchanger flows into the ventilation layer while having a temperature lower than the outdoor temperature. Therefore, even if the surface wall is warmed by the outdoor temperature, the temperature of the air flowing through the ventilation layer is higher than the indoor temperature and lower than the outdoor temperature, so that a temperature difference is generated stepwise from inside to outside.

[0006] If necessary, the introduction path is connected to an outside air suction pipe having an outside air suction port for taking in outside air, and is connected to the outside air suction pipe and buried in the ground to be introduced from the outside air suction port. A buried pipe for performing heat exchange between outside air and heat in the ground, and an introduction pipe provided with the heat exchanger and having an outside air outlet that communicates with the buried pipe and allows outside air from the buried pipe to flow indoors. The exhaust path is provided with an inside air intake pipe having an inside air intake port for taking in inside air, and the heat exchanger is provided and communicated with the inside air intake pipe to be taken in from the inside air intake port of the inside air intake pipe. And a discharge pipe having an exhaust port through which inside air flows into the ventilation layer.
Outside air is introduced from the outside air suction port and flows into the buried pipe. In this buried pipe, heat exchange is performed between the inflowing outside air and heat underground. That is, the temperature of the outside air flowing into the buried pipe is increased or decreased according to the temperature in the ground and the temperature of the outside air. Then, the heat-exchanged outside air flows into the heat exchanger.
The outside air flowing into the heat exchanger is indirectly exchanged with the inside air flowing from the inside air intake port. In the heat exchanger,
The outside air is heated or reduced according to the temperature of the inside air. The inside air is heated or reduced according to the temperature of the outside air. The outside air that has flowed into the introduction pipe from the heat exchanger flows into the room from below the outside air outlet through the floor. The inside air flowing into the discharge pipe from the heat exchanger flows into the ventilation layer from the exhaust port and is discharged.

[0007] If necessary, the discharge pipe of the discharge path and the introduction pipe of the introduction path are arranged under the floor. Since the temperature under the floor is set between the outdoor and the indoor, the outside air or the inside air is also heated or reduced in the discharge pipe and the introduction pipe. Further, the above-mentioned buried pipe is buried under the floor as needed. The temperature in the ground under the floor is lower or higher than the temperature in the ground without the buildings due to the presence of the building. Therefore, the outside air is heated or cooled in the buried pipe. Furthermore,
If necessary, open the outside air outlet of the introduction pipe below the floor,
The floor is provided with a communication passage for communication with the room, and the outside air is introduced into the room through the floor. Since the heated or cooled outside air flows under the floor, the action of heating or reducing the temperature of the outside or inside air in the discharge pipe and the introduction pipe disposed under the floor is improved. Further, a heater for heating the outside air heat-exchanged by the heat exchanger is provided in the introduction path as needed. The outside air heated by the heat exchanger can be further heated and introduced indoors. Further, if necessary, a discharge fan provided in the middle of the discharge path and sucking the inside air to pump the air to the ventilation layer, and an introduction fan provided in the middle of the introduction path to suck the outside air and feed the indoor air to the indoor side And a configuration including: Since the outside air or the inside air is sucked or exhausted, the outside air is actively
The air is guided by the heat exchanger or the heater to be forcibly heated or decelerated, and the inside air is positively guided by the heat exchanger to be forcibly heated or decelerated and flow into the ventilation layer.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ventilation structure for a house according to an embodiment of the present invention will be described below with reference to the accompanying drawings. There are various architectural styles such as wooden and steel bars as the house, but here, a two-story wooden house will be described as an example. As shown in FIG. 1, a ventilation structure S of a house includes an outer wall 3 provided with a floor 2 on a frame-shaped foundation 1, an inner heat insulating wall 4, and a surface wall 5 provided outside the heat insulating wall 4. And a ventilation layer 6 is formed between the heat insulating wall 4 and the surface wall 5.
Air is introduced into the ventilation layer 6 from a. At the upper part of the ventilation layer 6, for example, inside air is exhausted from an exhaust port (not shown) provided in the vicinity of the roof in communication with the attic.

Reference numeral 10 denotes an introduction path for introducing outside air, which is outdoor air, indoors. The introduction path 10 includes an outside air suction pipe 12 having an outside air suction port 11 for taking in outside air, and an introduction fan 1 for sucking outside air into the outside air suction pipe 12 and forcing it into the inside.
And a heat exchanger 15 for exchanging heat between the inside air and the outside air, which is buried in the ground and exchanges heat between the outside air introduced from the outside air suction port 11 and the ground. And an introduction pipe 17 having an outside air outlet 16 that communicates with the buried pipe 14 and allows outside air from the buried pipe 14 to flow into the room. The outside air suction pipe 12 penetrates the foundation 1, and the outside air suction port 11 is provided so as to open downward so that rainwater does not enter under the eaves. Introduction fan 13
Is controlled to be operable when desired by an operation switch provided indoors. The buried pipe 14 is formed in a U-shape and is buried under the floor under the floor, and has an inlet and an outlet located under the floor. The heat exchanger 15 has an effect of bringing the inside air and the outside air into indirect contact with each other to bring both gases into a thermal equilibrium state. Specifically, heat exchange is performed by bringing outside air introduced from the buried pipe 14 into contact with inside air introduced from the inside air intake pipe 22 through a partition having a large surface area and excellent heat conduction. The introduction pipe 17 is configured to branch from the heat exchanger 15 below the first floor and the second floor below the floor,
A heater 18 that heats the outside air that has been heat-exchanged is provided on the outer periphery of the introduction pipe 17 at a location before branching. The heater 18 can be adjusted to adjust the degree of heating, and is controlled to be operable when desired by an operation switch provided indoors. The outside air outlet 16 of the introduction pipe 17 is opened under the floor on the first and second floors, and the outside air flowing under the floor from the outside air outlet 16 passes through a plurality of communication passages 19 provided so as to communicate with the room on each floor and under the floor. It flows into the room.

Reference numeral 20 designates the inside air, which is indoor air, as the ventilation layer 6.
This is the discharge path that flows into The discharge path 20 includes an inside air intake pipe 22 having an inside air intake port 21 for taking in inside air,
An exhaust pipe 30 provided with a heat exchanger 15 and having an exhaust port 23 communicating with the internal air intake pipe 22 and allowing the internal air taken from the internal air intake port 21 of the internal air intake pipe 22 to flow into the ventilation layer 6.
It is comprised including. The inside air intake pipe 22 is provided at a predetermined position in each room (here, one room on each floor).
The heat exchangers 15 of the inside air intake pipes 22 are provided with exhaust fans 24 for sucking the inside air and forcing the inside air to the ventilation layer 6. The discharge fan 24
It is controlled to be operable when desired by an operation switch provided indoors. As shown in FIG. 2, the discharge pipe 30 includes an annular outer discharge pipe 31 and an annular inner discharge pipe 33 provided inside the outer discharge pipe 31 and communicated with the outer discharge pipe 31 by a plurality of connection pipes 32. It is provided with. As shown in FIG. 3, the outer discharge pipe 31 has discharge holes 34 arranged in an axial direction, and the outer discharge pipe 31 is connected to the lower end 6a through the connection passage 7. The ground under the floor is covered with, for example, a moisture-proof sheet and concrete.

Therefore, according to the ventilation structure of the house according to this embodiment, the introduction fan 13 and the discharge fan
By actuating the air 4, the outside air is sucked from the outside air suction pipe 12, and the inside air is pumped from the discharge pipe 30 to the ventilation layer 6, so that the indoor ventilation can be performed and the heat insulation effect can be induced.
Further, if necessary, the outside air to be sucked can be heated by operating the heater 18. First, the ventilation effect when the temperature of the outside air is lower than that of the inside air will be described. In this case, the introduction fan 13, the discharge fan 24 and the heater 18
Is operating. Outside air is introduced from the outside air suction port 11 and flows into the buried pipe 14. In the buried pipe 14, heat exchange is performed between the inflowing outside air and the heat in the ground. That is,
Since the temperature in the ground is higher than the temperature of the outside air, the temperature of the outside air flowing into the buried pipe 14 is heated. Then, the heated outside air flows into the heat exchanger 15. The outside air flowing into the heat exchanger 15 is indirectly subjected to heat exchange with the inside air taken in from the inside air intake port 21. In the heat exchanger 15, since the temperature of the outside air is lower than the temperature of the inside air, it is heated. Conversely, the inside air is cooled by heat exchange. The outside air flowing into the introduction pipe 17 from the heat exchanger 15 is further heated by the heater 18 and flows into the room from the outside air outlet 16 through the underfloor. In this way, the outside air is sequentially heated by the buried pipe 14, the heat exchanger 15, and the heater 18, and therefore contributes to the heat retention without lowering the indoor temperature as compared with the case where the outside air is simply introduced indoors. can do. The inside air that has flowed into the discharge pipe 30 from the heat exchanger 15 flows into the ventilation layer 6 from the exhaust port 23 while maintaining a temperature higher than the outdoor temperature. Therefore, even if the surface wall 5 is cooled by the outdoor temperature, the temperature of the air flowing through the ventilation layer 6 is lower than the indoor temperature and higher than the outdoor temperature, so that a temperature difference occurs stepwise from inside to outside. The heat insulating property is improved, the internal temperature is hard to escape to the outside via the outer wall 3, and the heat loss is reduced. Therefore, since the outside air is heated and introduced indoors, the inside air flows into the ventilation layer 6 and shields indoors and outdoors from heat transfer.
Thus, the heating efficiency is improved without impairing the heat insulation. In this case, although the temperature of the air reaching the ventilation layer 6 is lower than the room temperature by the heat exchanger 15, it is still higher than the outside air temperature, so that the heat insulation effect is hardly affected. According to the applicant's experiment, the inside air temperature is 20
° C and the outside air temperature is minus 5 ° C, the outside air is
Is heated to minus 3 ° C when passing through the heat exchanger 15
And heated to 13.1 ° C. by the heat exchanger 15 and the heater 18 and flowed indoors. On the other hand, the inside air is heat exchanger 15
At 3.9 ° C., and flowed into the ventilation layer 6.

Next, the ventilation function when the temperature of the outside air is higher than that of the inside air will be described. In this case, the introduction fan 13
And only the discharge fan 24 is operated. Outside air is introduced from the outside air suction port 11 and flows into the buried pipe 14. In the buried pipe 14, heat exchange is performed between the inflowing outside air and the heat in the ground. That is, since the temperature in the ground is lower than the temperature of the outside air, the temperature of the outside air flowing into the buried pipe 14 is reduced. Then, the reduced temperature outside air flows into the heat exchanger 15. The outside air flowing into the heat exchanger 15 is indirectly subjected to heat exchange with the inside air taken in from the inside air intake port 21.
In the heat exchanger 15, since the temperature of the outside air is higher than the temperature of the inside air, the temperature is reduced. Conversely, the inside air is heated by heat exchange. The outside air flowing into the introduction pipe 17 from the heat exchanger 15 is:
The air flows into the room from the outside air outlet 16 through the underfloor. Therefore, the outside air is buried in the pipe 14, the heat exchanger 15, and the heater 18.
, The temperature can be kept without increasing the indoor temperature as compared with the case where outside air is simply introduced indoors. The inside air that has flowed into the discharge pipe 30 from the heat exchanger 15 has a temperature lower than the outdoor air temperature, and
3 flows into the ventilation layer 6. Therefore, even if the surface wall 5 is heated by the outdoor temperature, the temperature of the air flowing through the ventilation layer 6 is higher than the indoor temperature and lower than the outdoor temperature, so that a temperature difference occurs stepwise from inside to outside. The heat insulating property is improved, the external temperature is hardly transmitted to the inside, and the heat transfer is reduced. Therefore, the indoor heat retention is improved.

Further, since the exhaust pipe 30 and the inside air intake pipe 22 are arranged under the floor having a temperature between the outside and the inside,
The exhaust pipe 30 and the inside air intake pipe 22 are also heated or reduced in temperature, thereby contributing to heat retention and heat insulation.
Further, since the buried pipe 14 is buried under the floor, the outside air is heated or reduced in the ground under the building,
The temperature of the ground is lower or higher due to the presence of the building compared to the ground under the sun outside the building, so that the efficiency of heating or cooling is improved. Further, since the outside air and the inside air are sucked or exhausted by the introduction fan 13 or the discharge fan 24, the outside air is positively buried in the buried pipe 14, the heat exchanger 15 or the heater 1.
8, the air is forcibly heated or decelerated, and the inside air is positively guided to the heat exchanger 15, forcibly heated or decelerated, and introduced into the ventilation layer 6. A temperature gradient can be formed from indoors to outdoors, and more stable heat insulation can be achieved. In addition, since the discharge pipe 30 includes the annular outer discharge pipe 31 and the annular inner discharge pipe 33, the discharge pipe 30 is heated or reduced in temperature under the floor by the two annular rings. Further, the heat insulation and heat insulation of the building are excellent, and the heating efficiency is improved.

In the above embodiment, the numbers and shapes of the outside air suction pipe 12, the buried pipe 14, and the discharge pipe 30 are not limited to those described above, but may be determined as appropriate.
Further, the outside air suction pipe 12 and the buried pipe 14 may be provided at a plurality of locations and connected to the heat exchanger 15. Further, the introduction fan 13 and the discharge fan 24 can be provided at desired locations as needed.

[0015]

As described above, according to the ventilation structure for a house of the present invention, the discharge path is communicated with the lower end of the ventilation layer to allow the inside air to flow into the ventilation layer, and at the same time, between the discharge path and the introduction path. A heat exchanger for exchanging heat between the inside air and the outside air is provided in the room, the heat-exchanged outside air is introduced indoors, the heat-exchanged inside air flows into the ventilation layer, and the temperature of the outside air is maintained at the indoor temperature. As well as adjusting the inside air temperature between the indoor and outdoor temperatures to form a temperature gradient,
It is possible to improve indoor heat retention efficiency and heat insulation efficiency by effectively utilizing the heat exchange of the amount of indoor air exhausted outdoors during ventilation. In addition, the introduction path is connected to an outside air intake pipe having an outside air intake port for taking in outside air, and heat exchange between outside air and ground heat that is buried in the ground and introduced from the outside air intake port while being buried in the ground. And an inlet pipe provided with a heat exchanger and having an outside air outlet that communicates with the buried pipe and allows outside air from the buried pipe to flow into the room. An inside air intake pipe having an intake port, and an exhaust pipe provided with a heat exchanger and having an exhaust port communicating with the inside air intake pipe and allowing the inside air taken from the inside air intake port of the inside air intake pipe to flow into the ventilation layer. If so,
Since the outside air is sequentially heat-exchanged between the buried pipe and the introduction pipe, the function of adjusting the temperature of the outside air to maintain the indoor temperature is improved, and the indoor heat retaining efficiency and the heat insulation efficiency can be further improved.

Further, when the discharge pipe of the discharge path and the introduction pipe of the introduction path are arranged under the floor, the outside air keeps the indoor temperature under the floor or the inside air approaches the indoor temperature under the floor. Therefore, the indoor heat insulation efficiency and the heat insulation efficiency can be further improved. Furthermore, when the buried pipe is buried under the floor, the outside air is adjusted so as to further maintain the indoor temperature under the floor, so that the indoor heat insulation efficiency and the heat insulation efficiency are further improved. be able to. Further, the outside air outlet of the introduction pipe is opened under the floor, and a communication path for communicating the indoor with the floor is provided on the floor. When the outside air flows into the indoor through the floor, the heat-exchanged outside air is distributed under the floor. The temperature control of the outside air and the inside air flowing through the discharge pipe of the provided discharge path and the introduction pipe of the introduction path can be assisted. Furthermore, in the case where a heater for heating the outside air heat-exchanged by the heat exchanger is provided in the introduction path, the outside air is heated by the heater when the temperature of the outside air is lower than that of the inside air to approach the indoor temperature. Can be further introduced indoors, so that the indoor heat insulation efficiency and the heat insulation efficiency can be further improved. Furthermore, in the case where there is provided a discharge fan provided in the middle of the discharge path and sucking the inside air and sending it to the ventilation layer, and an introduction fan provided in the middle of the introduction path and sucking the outside air and sending it to the indoor side, In addition, since the outside air and the inside air can be positively sucked and the heat can be forcibly exchanged, the heat insulation efficiency and the heat insulation efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a ventilation structure of a house according to an embodiment of the present invention.

FIG. 2 is a plan view showing an example of a piping state of a discharge pipe in a ventilation structure of a house according to an embodiment of the present invention.

FIG. 3 is a diagram showing an outer discharge pipe of the discharge pipe in the ventilation structure of a house according to the embodiment of the present invention, as viewed from a communication passage side.

[Description of Signs] S House ventilation structure 1 Foundation 2 Floor 3 Outer wall 4 Insulation wall 5 Surface wall 6 Ventilation layer 6a Lower end 7 Connection passage 10 Introductory path 11 Outside air suction port 12 Outside air suction pipe 13 Introducing fan 14 Buried pipe 15 Heat exchange Vessel 16 Outside air outlet 17 Inlet pipe 18 Heater 19 Communication path 20 Drain path 21 Inside air intake port 22 Inside air intake pipe 23 Exhaust port 24 Discharge fan 30 Discharge pipe 31 Outside discharge pipe 32 Connection pipe 33 Inner discharge pipe 34 Communication hole

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F24F 7/10 F24F 7/10 Z

Claims (7)

[Claims] An outer wall provided with a floor on a foundation is provided with an inner heat insulating wall and a surface wall provided outside the heat insulating wall, and a ventilation layer is formed between the heat insulating wall and the surface wall. And a house having an introduction path for introducing outside air into the room surrounded by the outer wall and a discharge path for discharging the inside air inside the room, while introducing air from the lower end of the ventilation layer into the ventilation layer. A heat exchanger that communicates the inside air and the outside air between the discharge path and the introduction path while allowing the exhaust path to communicate with the lower end of the ventilation layer to allow the inside air to flow into the ventilation layer. And a ventilation structure for a house, wherein heat-exchanged outside air is introduced indoors. 2. An outside air intake pipe having an outside air intake port for taking in outside air, an outside air intake pipe communicating with the outside air intake pipe and being buried in the ground and introduced from the outside air intake port into the underground path. A buried pipe for performing heat exchange with the heat of the heat exchanger, and an inlet pipe provided with the heat exchanger and having an outside air outlet that communicates with the buried pipe and allows outside air from the buried pipe to flow into the room. The exhaust passage is provided with an inside air intake pipe having an inside air intake port for taking in inside air, and the heat exchanger is provided and communicates with the inside air intake pipe to ventilate the inside air taken in from the inside air intake port of the inside air intake pipe. 2. The ventilation structure for a house according to claim 1, further comprising a discharge pipe having an exhaust port for flowing into the layer. 3. The discharge pipe of the discharge path and the introduction pipe of the introduction path are disposed under the floor.
The described ventilation structure of the house. 4. A ventilation structure for a house according to claim 2, wherein said buried pipe is buried under the floor. 5. The outside air outlet of the introduction pipe is opened under the floor, a communication passage communicating the indoor with the floor is provided, and the outside air flows into the indoor through the floor under the floor. Or the ventilation structure of the house of 4. 6. A ventilation structure for a house according to claim 1, wherein a heater for heating the outside air heat-exchanged by said heat exchanger is provided in said introduction path. . 7. A discharge fan provided in the middle of the discharge path for sucking inside air and sending it to the ventilation layer by pressure, and an introduction fan provided in the middle of the introduction path for sucking outside air and sending it to the indoor side. The method according to claim 1, wherein
The ventilation structure of a house according to 3, 4, 5 or 6.