Heat shield system for building

Abstract

To provide a heat shield system for building capable of providing heat shield effect in summer without affecting an indoor environment in winter.SOLUTION: A heat shield system (1) for building is a heat shield system for a building which includes a living room (11) provided with a light-transmissive window (2), and comprises: a ventilation hole (3) which is arranged in the window frame part (20) encircling the window and located above the window; a heat shield member (4) which is fitted to the window frame part to face the indoor space (S1) of the living room; and heat exhaustion accelerating means (5). The heat shield member (4) is provided to be placed in a closed state in which the window and ventilation hole are shielded or an opening state in which at least a part of the window is exposed. The heat exhaustion accelerating means (5) feeds the outside air into the indoor space in summer to produce positive pressure in the indoor space so as to send air in the indoor space into a shield space (S2) between the window and the heat shield member from below the heat shield member in the closed state and then exhaust heat air in the shield space through the ventilation hole.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a heat insulation system for a building, and more particularly to a heat insulation system for a building equipped with a third type of ventilation system.

Background Art

[0002] As a technology for blocking solar radiation from windows in buildings such as houses, there are the following.

[0003] In Japanese Patent Application Laid-Open No. 2010-236200 (Patent Document 1), a technique has been proposed in which a breathable member that partitions the indoor space into two spaces is arranged at a position facing the window, and the space on the window side is used as a buffer space.

[0004] In Japanese Patent Application Laid-Open No. 2012-172321 (Patent Document 2), a technique has been proposed in which a heat insulation panel with a heat ray reflection film attached is incorporated into a window to improve the heat insulation performance of the window itself.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Since the technology of Patent Document 1 realizes heat insulation by dividing the indoor space into two spaces, the indoor space becomes narrow. In addition, since solar heat has penetrated into a part of the indoor space (buffer space), it is difficult to say that it is an effective solar radiation shielding technology. Further, in Patent Document 1, the main purpose is not to harm the path of the 24-hour ventilation system, and no special measures are considered from the viewpoint of exhaust heat.

[0007] While the technology of Patent Document 2 can prevent the intrusion of solar heat into the indoor space, since it incorporates a heat-insulating panel in the window, it is difficult to remove. Therefore, it blocks the winter solar radiation, which has an adverse effect on the indoor environment in winter.

[0008] The present invention has been made to solve the above problems, and its object is to provide a heat-insulating system for a building that can obtain a heat-insulating effect in summer without affecting the indoor environment in winter.

Means for Solving the Problems

[0009] A heat-insulating system for a building according to an aspect of the present invention is a heat-insulating system for a building including a living room provided with a translucent window, and includes a ventilation opening disposed within a window frame portion surrounding the window and located above the window, a heat-insulating member attached to the window frame portion so as to face the indoor space of the living room, and an exhaust heat promotion means. The heat-insulating member is provided so as to be changeable between a closed state that conceals the window and the ventilation opening and an open state that exposes at least a part of the window. The exhaust heat promotion means supplies outside air to the indoor space in summer to make the indoor space under positive pressure, thereby sending the air in the indoor space into the shielding space between the window and the heat-insulating member from below the heat-insulating member in the closed state, and discharging the hot air in the shielding space from the ventilation opening.

[0010] Preferably, the exhaust heat promotion means includes an air supply fan that is disposed away from the window in a plan view and supplies outside air to the indoor space, and an operation control means that operates the air supply fan during a time zone with solar radiation.

[0011] It is desirable that the operation control means operates the air supply fan at different intensities according to the comparison result of the outside air temperature and the indoor temperature. Specifically, when the indoor temperature is lower than the outside air temperature, it is desirable that the operation control means operates the air supply fan so that the air supply volume becomes a first air volume, and when the indoor temperature is higher than the outside air temperature, it is desirable that the operation control means operates the air supply fan so that the air supply volume becomes a second air volume that is larger than the first air volume.

[0012] In addition, in a form where a cooling device (air conditioning device) is provided in an indoor space, it is desirable that the operation control means operate the supply air fan at different intensities according to the operating status of the cooling device.

[0013] It is also desirable that the operation control means operate the supply air fan at different intensities according to the presence or absence of people in the indoor space.

[0014] The building is typically a house and is equipped with a third type of ventilation system. In this case, the ventilation opening may also serve as a natural supply air opening for constantly ventilating the indoor space.

[0015] The building includes a living room and other adjacent rooms (typically non-living rooms) via furniture. It is desirable that the heat insulation system further includes a closing means for closing the lower gap of the furniture that serves as a constant ventilation path when the exhaust heat promotion means is operating.

Advantages of the Invention

[0016] According to the present invention, it is possible to obtain a heat insulation effect in summer without affecting the indoor environment in winter. In addition, it is possible to prevent the hot air insulated by the heat insulation member from staying in the shielding gap between the window and the heat insulation member for a long time or flowing into the room.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

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Figure 8

Embodiments for Carrying Out the Invention

[0018] Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions are not repeated.

[0019] (Overview of the heat insulation system) With reference to FIGS. 1 and 2, the outline of a heat insulation system (hereinafter abbreviated as "heat insulation system") 1 of a building according to the present embodiment will be described. FIG. 1 shows a state in which the indoor space S1 of the living room 11 is ventilated by the third type of ventilation (normal ventilation mode), and FIG. 2 shows a state in which the indoor space S1 of the living room 11 is ventilated by the second type of ventilation (heat insulation and exhaust heat mode).

[0020] The building in the present embodiment includes a living room 11 provided with a window 2 having translucency such as glass. The window 2 is surrounded by a window frame portion 20. The window frame portion 20 is a portion that forms an opening for the window 2, and is not limited to an example formed by a dedicated frame material (a part of the window frame portion 20 may be formed by an outer wall or a floor).

[0021] As shown in FIG. 1, the building in this embodiment is constantly ventilated by a third type of ventilation system. The third type of ventilation system creates a negative pressure in the indoor space S1 of the living room 11 by constantly operating the exhaust fan 6 provided in the non-living room 12 of the building. A building fixture 13 such as a sliding door is provided between the living room 11 and the non-living room 12 (other room), and the lower gap S3 of the building fixture 13 constitutes a part of the ventilation path. By creating a negative pressure in the indoor space S1, outside air is naturally supplied from the ventilation opening 3, which serves as a natural air supply opening provided in the living room 11. In this way, the living room 11 (indoor space S1) is constantly ventilated. In this embodiment, the ventilation opening 3 is provided above the window 2. The ventilation opening 3 is a so-called window frame and is typically attached to the sash common to the window 2.

[0022] The heat insulation system 1 according to this embodiment includes a heat insulation member 4 provided inside the window 2 in order to block the heat incident from the window 2 into the indoor space S1. The heat insulation member 4 is attached to the window frame portion 20 so as to face the indoor space S1. The heat insulation member 4 is a window accessory suspended from the upper end portion of the window frame portion 20 (via an attachment member) and is typically composed of a sheet-like (planar) member such as a roll screen that can be rolled up. It is desirable that the heat insulation member 4 has no air permeability.

[0023] FIG. 8 shows a comparison. As shown in FIG. 8(A), when a heat insulation member (window accessory) 104 such as a bamboo blind is provided outside the window 2, a relatively high heat insulation effect can be expected. However, if the heat insulation member 104 is provided on the outdoor side, there is a concern that the design and fire resistance performance of the building may deteriorate (there are cases where the heat insulation member 104 cannot be attached). On the other hand, as shown in FIG. 8(B) (similar to this embodiment), when a heat insulation member (window accessory) 4 is provided inside the window 2, there is no concern about the deterioration of the design and fire resistance performance as described above. On the other hand, in the building of FIG. 8(B), since the natural air supply opening is provided at a location away from the window 2 (not shown), during the summer solar radiation, hot air heated by the solar radiation from the window 2 may accumulate in the space (hereinafter referred to as the "shielded space") S2 between the window 2 and the heat insulation member 4. Then, the heat insulation effect on the indoor space S1 will be reduced.

[0024] Here, as shown in FIG. 1, when the ventilation opening 3 as a natural air supply port is provided above the window 2, the hot air in the shielding space S2 may be discharged into the indoor space S1 together with the outside air from below the heat insulation member 4 (from the gap between the lower part of the window frame part 20 and the lower end part of the heat insulation member 4). Therefore, as shown in FIG. 2, the heat insulation system 1 according to the present embodiment includes an exhaust heat promotion means 5 for discharging the hot air in the shielding space S2 from the ventilation opening 3. The exhaust heat promotion means 5 is configured to supply the outside air (forcibly) into the indoor space S1 in summer to make the indoor space S1 in a positive pressure state, so as to send the air in the indoor space S1 from below the closed heat insulation member 4 into the shielding space S2 and discharge the hot air in the shielding space S2 from the ventilation opening 3.

[0025] That is, the heat insulation system 1 according to the present embodiment includes a ventilation opening 3 provided above the window 2 in the window frame part 20, a heat insulation member 4 that can be changed between a closed state that conceals the window 2 and the ventilation opening 3, and an open state that exposes at least a part (lower end part) of the window 2, and an exhaust heat promotion means 5 for discharging the hot air in the shielding space S2 from the ventilation opening 3 during summer solar radiation. Note that "summer" includes midsummer and does not include winter. Summer may include intermediate periods (spring, autumn).

[0026] Since the building of the present embodiment is equipped with the third type of ventilation system as described above, in the "normal ventilation mode" in which the exhaust heat promotion means 5 is inoperative, as shown in FIG. 1, the indoor space S1 is ventilated by the third type of ventilation method, and in the "heat insulation and exhaust heat mode" in which the exhaust heat promotion means 5 is operated, as shown in FIG. 2, the indoor space S1 is ventilated by the second type of ventilation method. The ventilation opening 3 provided above the window 2 serves both as a natural air supply port for constant ventilation and as a natural exhaust port during exhaust heat.

[0027] (Application Example of Heat Insulation System) Figures 3 and 4 are diagrams showing an example in which the heat insulation system 1 is applied to a house equipped with a third type of ventilation system. Fig. 3 shows the ventilation path of the living room 11 in the normal ventilation mode, and Fig. 4 shows the ventilation path of the living room 11 in the heat insulation and exhaust mode. Note that only in Fig. 4, the configurations related to the exhaust promotion means 5 (such as the temperature sensors 81 and 82 described later) are shown.

[0028] The houses shown in Figs. 3 and 4 include a living room 11 to be heat-insulated and a non-living room 12 provided with an exhaust fan 6 for constant ventilation. The living room 11 is, for example, a LDK room (living-dining-kitchen room), and the non-living room 12 is, for example, a toilet. Note that the living room 11 to be heat-insulated is not limited to the LDK room and may be a private room. Also, the non-living room 12 provided with the exhaust fan 6 may be a bathroom, a corridor, or the like.

[0029] Referring to Fig. 4, the exhaust promotion means 5 provided in the heat insulation system 1 will be described. The exhaust promotion means 5 includes an air supply fan 51 that is arranged away from the window 2 in a plan view and supplies outside air to the indoor space S1, and a control device 52 that operates the air supply fan 51 during a time period with summer solar radiation. The air supply fan 51 is typically provided near a corner of the living room 11. The air supply fan 51 may be provided on the wall portion (outer wall) of the living room 11 or may be provided on the ceiling portion of the living room 11 via a duct (as long as a mechanical air supply port by the air supply fan 51 is provided in the living room 11). The control device 52 functions as an operation control means and is realized by a computer including a processor and a memory.

[0030] Since the control device 52 does not operate the air supply fan 51 in winter, the ventilation mode of the living room 11 in winter is the normal ventilation mode throughout the day. Therefore, in winter, as shown in Fig. 3, the outside air taken in from the ventilation opening 3 is naturally supplied to the indoor space S1. Then, the air in the indoor space S1 is sent from the lower gap S3 of the fitting 13 to the non-living room 12 and exhausted by the exhaust fan 6. Since the heat insulation member 4 is provided to be openable and closable, by setting the heat insulation member 4 in the open state in winter, the solar radiation from the window 2 can be directly taken into the indoor space S1, and the indoor environment can be improved.

[0031] In the control device 52 according to this embodiment, even in summer, during a time period without solar radiation, the supply air fan 51 is not operated, and the ventilation mode of the living room 11 is set to the normal ventilation mode. In this way, it is desirable to operate the supply air fan 51 and set the ventilation mode of the living room 11 to the heat insulation and exhaust heat mode only during a time period when there is a high possibility that hot air accumulates in the shielding space S2 in front of the window 2.

[0032] Even in the heat insulation and exhaust heat mode, since the exhaust fan 6 is in operation, as shown by the cross marks in FIG. 4, it is preferable to close the lower gap S3 of the fitting 13. That is, it is desirable that the heat insulation system 1 includes a closing means (not shown) for closing the lower gap S3 that normally serves as a ventilation path when the exhaust heat promoting means 5 operates. Thereby, the indoor space S1 can be made positive pressure without making the air volume of the supply air fan 51 larger than necessary.

[0033] In the heat insulation and exhaust heat mode, since the indoor space S1 becomes positive pressure due to mechanical air supply by the supply air fan 51, as shown in FIG. 4, the air in the indoor space S1 is naturally exhausted from the ventilation opening 3. In summer, the ventilation opening 3 is covered with the heat insulation member 4 having no air permeability (or extremely low air permeability) together with the window 2, so that the air in the indoor space S1 is exhausted from the ventilation opening 3 through the shielding space S2. Since there is only a minute gap between both side portions of the heat insulation member 4 and the window frame portion 20, the lower side of the heat insulation member 4 serves as an air inlet to the shielding space S2. During the heat insulation and exhaust heat mode, typically, as shown in FIG. 2, the lower end height of the heat insulation member 4 is located (slightly) above the lower end height of the window 2, and the gap S4 between the lower end portion of the heat insulation member 4 and the window frame portion 20 serves as the inlet.

[0034] By setting the ventilation mode of the living room 11 to the heat insulation and exhaust mode during the daytime in summer, the heat insulation member 4 can block direct sunlight and exhaust the hot air trapped in the shielding space S2, thus improving the indoor environment. However, when the air conditioner (cooling device) 7 provided in the living room 11 is in use, there may be no expected exhaust heat effect. Fig. 5(A) is a chart showing the relationship between the air volume of the air supply fan 51 and the heat balance when the air conditioner is in use (during cooling) assuming a highly airtight house. Fig. 5(B) is a chart showing the relationship between the air volume of the air supply fan 51 and the heat balance when the air conditioner is not in use (absent) assuming a highly airtight house.

[0035] As shown in Fig. 5(B), when the air conditioner is not in use (absent) in summer, since the indoor temperature (e.g., 35 degrees) is higher than the outdoor temperature (e.g., 30 degrees), the more the outdoor air is introduced into the indoor space S1, the more effective it is in lowering the room temperature (the heat balance becomes larger). On the other hand, as shown in Fig. 5(A), when the air conditioner is in use in summer, since the indoor temperature (e.g., 26 degrees) is lower than the outdoor temperature (e.g., 30 degrees), if a large amount of outdoor air is introduced into the indoor space S1, conversely, the room temperature will rise (the heat balance becomes negative). When a small amount of outdoor air is introduced into the indoor space S1 even when the air conditioner is in use, there is an effect of lowering the room temperature. Note that the numerical values shown in Fig. 5 assume that the temperature of the shielding space S2 is 40 degrees.

[0036] (Functional Configuration of Exhaust Heat Promotion Means) The control device 52 in the present embodiment selects the level of the heat insulation and exhaust mode, that is, the operation intensity of the air supply fan 51, from multiple levels (weak, medium, strong) according to the judgment results of multiple conditions including not only the presence or absence of sunlight, but also the relationship between the outdoor temperature and the indoor temperature, the operation status of the air conditioner 7, and the presence or absence of people in the room. Fig. 6 is a block diagram showing the functional configuration of the exhaust heat promotion means 5.

[0037] As shown in FIG. 6, the control device 52 includes an acquisition unit 53 that acquires information (data) corresponding to each condition, a determination unit 54 that determines the level of the heat insulation and heat exhaust mode (the operation intensity of the air supply fan 51) based on the information acquired by the acquisition unit 53, and an operation control unit 55 that operates the air supply fan 51 at the operation intensity determined by the determination unit 54.

[0038] In the present embodiment, the acquisition unit 53 acquires the solar radiation amount, the outside air temperature, the indoor temperature, the operation status of the air conditioner 7, and the presence or absence of people in the indoor space S1. The solar radiation amount may be acquired from a solar radiation sensor (not shown) installed outdoors of the house, or may be extracted from the meteorological information obtained via the Internet 9. The outside air temperature can be acquired from the temperature sensor 82 installed outdoors of the house, and the indoor temperature can be acquired from the temperature sensor 81 installed in the indoor space S1 (see FIG. 4). Note that the outside air temperature may be extracted from the meteorological information obtained via the Internet 9. The presence or absence of people in the indoor space S1 can be detected by the presence sensor 83 installed in the indoor space S1 or by the temperature sensor (see FIG. 4).

[0039] The determination unit 54 compares the outside air temperature and the indoor temperature detected by the temperature sensors 81 and 82, and determines whether to set the level of the heat insulation and heat exhaust mode to "weak" according to the comparison result. Also, according to the operation status (on, off) of the air conditioner 7, it is determined whether to set the level of the heat insulation and heat exhaust mode to "weak". Further, when the level of the heat insulation and heat exhaust mode is other than "weak", it is determined whether to set the level of the heat insulation and heat exhaust mode to "strong" according to the detection result by the in-room detection means (presence sensor 83).

[0040] The operation control unit 55 operates the air supply fan 51 at different intensities (weak, medium, strong) according to the level of the heat insulation and heat exhaust mode determined by the determination unit 54.

[0041] (Operation of the heat exhaust promotion means) FIG. 7 is a flowchart showing the operation intensity determination process executed by the control device 52 (determination unit 54). The operation intensity determination process is executed, for example, in the summer from June to October at a predetermined timing (for example, every 10 minutes).

[0042] First, the determination unit 54 determines whether the solar radiation amount is equal to or greater than a predetermined value (step ST1). If the solar radiation amount is equal to or greater than the predetermined value (YES in step ST1), the process proceeds to step ST2. If the solar radiation amount is less than the predetermined value (NO in step ST1), the determination unit 54 determines that the "heat insulation and heat exhaust mode is stopped" (step ST5). As a result, the operation control unit 55 stops the operation of the supply air fan 51. That is, the ventilation mode of the living room 11 becomes the normal ventilation mode (type 3 ventilation).

[0043] In step ST2, the determination unit 54 compares the outside air temperature and the indoor temperature. If the outside air temperature is lower than the indoor temperature and the indoor space S1 is hot (YES in step ST2), the process proceeds to step ST3. If the outside air temperature is equal to or higher than the indoor temperature and the indoor space S1 is cool (NO in step ST2), it is determined that the heat insulation and heat exhaust mode is "weak" (step ST6). As a result, the operation control unit 55 operates the supply air fan 51 with the operation intensity of the supply air fan 51 being "weak".

[0044] The supply air volume in the weak operation is the same air volume (first air volume) as the ventilation air volume in the constant ventilation. That is, outside air with the same air volume as the air volume of the exhaust fan 6 for constant ventilation is supplied to the indoor space S1. Therefore, while keeping the temperature of the indoor space S1 cool, the hot air trapped in the shielding space S2 can be exhausted by the type 2 ventilation method.

[0045] In step ST3, the determination unit 54 checks the operating status of the air conditioner 7. If the air conditioner 7 is in operation ("yes" in step ST3), since the start of use of the air conditioner 7 is assumed, it is determined that the heat insulation and heat exhaust mode is "weak" in the same manner as above (step ST6). On the other hand, if the operation of the air conditioner 7 is stopped ("no" in step ST3), the process proceeds to step ST4.

[0046] In step ST4, when the determination unit 54 determines that a person is present in the indoor space S1 (i.e., "present" in step ST4), it determines that the heat insulation and exhaust mode is "medium" (step ST7). As a result, the operation control unit 55 operates the supply air fan 51 with the operation intensity of the supply air fan 51 set to "medium". The supply air volume in the medium operation is a volume (second air volume) larger than the first air volume. In this case, since outside air at a temperature lower than the indoor temperature is actively taken in, for example, during a time period with strong solar radiation in the intermediate period, the indoor environment can be improved. Since the second air volume is smaller than the third air volume described later, it is possible to improve the indoor environment while suppressing the operation noise of the supply air fan 51 from becoming a nuisance noise.

[0047] On the other hand, when it is determined that no person is present in the indoor space S1 (i.e., "absent" in step ST4), it is determined that the heat insulation and exhaust mode is "strong" (step ST8). As a result, the operation control unit 55 operates the supply air fan 51 with the operation intensity of the supply air fan 51 set to "strong". The supply air volume in the strong operation is a volume (third air volume) larger than the second air volume. Since there is no need to worry about noise when no person is present, the indoor environment can be effectively improved by operating the supply air fan 51 in strong operation.

[0048] (Effect of the heat insulation system) As described above, since the heat insulation system 1 according to the present embodiment includes the heat insulation member 4 whose shielding area of the window 2 can be changed, the thermal environment of the indoor space S1 can be made optimal throughout the year.

[0049] In addition, by including the supply air fan 51 independent of the constant ventilation system, the heat insulation system 1 can switch the ventilation mode of the indoor space S1 from the normal ventilation mode (type 3 ventilation) to the heat insulation and exhaust mode (type 2 ventilation) only when the hot air due to solar radiation has an adverse effect. Therefore, it can be suitably applied to a house adopting a type 3 ventilation system. Further, even when the indoor space S1 is switched to the heat insulation and exhaust mode (type 2 ventilation), since the exhaust fan 6 is always operated, the thermal environment of the indoor space S1 of the living room 11 can be improved without affecting the ventilation state (always type 3 ventilation) of rooms other than the living room 11 (for example, private rooms).

[0050] In addition, in this embodiment, since the air volume of the supply air fan 51 can be changed according to the operating status of the air conditioner and the presence or absence of people, the thermal environment of the indoor space S1 can be improved efficiently. The control device 52 may operate the supply air fan 51 at different intensities according to at least the comparison result between the outside air temperature and the indoor temperature. That is, the operation control unit 55 of the control device 52 operates the supply air fan 51 so that the supply air volume becomes the first air volume when the indoor temperature is lower than the outside air temperature, and operates the supply air fan 51 so that the supply air volume becomes the second air volume, which is larger than the first air volume, when the indoor temperature is higher than the outside air temperature. The first air volume and the second air volume here do not have to match the above-described first air volume and second air volume.

[0051] In this embodiment, if there is solar radiation, the indoor space S1 is kept at a positive pressure even during air conditioning, and the cooled air is sent into the shielding space S2, so that condensation on the shielding space S2 and the surrounding wall portions can be suppressed.

[0052] As an application example of the exhaust heat promotion means 5 in this embodiment, the exhaust heat promotion means 5 may be operated when the differential pressure between the inside and outside of the room increases by operating the range hood (forced exhaust means) installed in the living room 11. That is, by interlockingly operating the supply air fan 51 when the range hood is operating, it is possible to suppress an increase in the differential pressure between the inside and outside of the room.

[0053] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0054] 1 Heat insulation system, 2 Window, 3 Ventilation opening, 4 Heat insulation member, 5 Exhaust heat promotion means, 6 Exhaust fan, 7 Air conditioner (cooling device), 11 Living room, 12 Non-living room, 13 Fittings, 20 Window frame part, 51 Supply air fan, 52 Control device, 81, 82 Temperature sensor, 83 Occupancy sensor, S1 Indoor space, S2 Shielded space, S3 Lower gap.

Claims

1. A heat insulation system for a building including a living room provided with a window having translucency, a ventilation opening disposed within a window frame portion surrounding the window and located above the window, a heat insulation member attached to the window frame portion so as to face the indoor space of the living room, which can be changed between a closed state for concealing the window and the ventilation opening and an open state for exposing at least a part of the window, and an exhaust heat promotion means for feeding air in the indoor space into a shielding space between the window and the heat insulation member from below the heat insulation member in the closed state by supplying outside air to the indoor space in summer to make the indoor space in a positive pressure state and discharging hot air in the shielding space from the ventilation opening. A heat insulation system for a building.

2. The exhaust heat promotion means includes an air supply fan disposed apart from the window in a plan view and supplying outside air to the indoor space, and an operation control means for operating the air supply fan in a time zone with solar radiation. The heat insulation system for a building according to Claim 1.

3. The operation control means operates the air supply fan so that an air supply air volume becomes a first air volume when the indoor temperature is lower than the outside air temperature, and operates the air supply fan so that the air supply air volume becomes a second air volume larger than the first air volume when the indoor temperature is higher than the outside air temperature. The heat insulation system for a building according to Claim 2.

4. A cooling device is provided in the indoor space, and the operation control means operates the air supply fan at different intensities according to an operation state of the cooling device. The heat insulation system for a building according to Claim 2.

5. The operation control means operates the air supply fan at different intensities according to the presence or absence of a person in the indoor space. The heat insulation system for a building according to Claim 2.

6. The building is equipped with a third type ventilation system, and the ventilation opening also serves as a natural air supply opening for constantly ventilating the indoor space. The heat insulation system for a building according to any one of Claims 1 to 4.

7. The building includes another room adjacent to the living room via a fitting, and further includes a closing means for closing a lower gap of the fitting that becomes a constant ventilation path when the exhaust heat promotion means operates. The heat insulation system for a building according to Claim 6.

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