JP7463125B2 - Ventilation system - Google Patents

Description

The present invention relates to a ventilation system that can reduce heating and cooling loads.

The building's indoor environment was controlled by air conditioning, but because a lot of heat was entering and leaving through the windows, which increased electricity costs, there was a need for something more economical.

In consideration of the above-mentioned circumstances, the present invention aims to provide a ventilation system that can reduce the amount of heat entering and leaving through windows and suppress the heating and cooling load.

In order to achieve the above object, the ventilation system of the invention described in claim 1 comprises a window, a heat exchanger, and an air intake and exhaust port , the window having an outer partition, an inner partition, and a flow straightener provided between the outer partition and the inner partition, and recovers heat escaping from the inner partition by allowing air to flow along the inner surface of the outer partition and the outer surface of the inner partition, the heat exchanger recovers heat from the inside air, the air intake and exhaust port is provided separately from the window and communicates with the outside, and the outside air is passed sequentially between the outer partition and the flow straightener and between the flow straightener and the inner partition before being passed through the heat exchanger, or passed through the heat exchanger and then between the outer partition and the flow straightener and between the flow straightener and the inner partition, thereby recovering heat escaping from the inner partition and heat from the inside air and taking it into the room, and the inside air from which heat has been removed by the heat exchanger is discharged to the outside of the room through the air intake and exhaust port .

The ventilation system according to the invention described in claim 2 comprises a window, a heat exchanger, and an air intake and exhaust port , the window having an outer partition, an inner partition, and a flow straightener provided between the outer partition and the inner partition, and recovers heat entering from the outer partition by air flowing along the outer surface of the inner partition and the inner surface of the outer partition , the air intake and exhaust port is provided separately from the window and communicates with the outside, and the heat exchanger recovers heat from the outside air introduced from the air intake and exhaust port , and the inside air is passed through the heat exchanger and then between the inner partition and the flow straightener and between the flow straightener and the outer partition in order, or between the inner partition, the flow straightener and the outer partition in order, and then passed through the heat exchanger, thereby recovering heat entering from the outer partition and heat from the outside air and discharging it to the outside, and the outside air from which heat has been removed by the heat exchanger is taken into the room.

The ventilation system according to the invention described in claim 1 comprises a window, a heat exchanger, and an air intake and exhaust port . The window has an outer partition, an inner partition, and a flow straightener provided between the outer partition and the inner partition, and recovers heat escaping from the inner partition by allowing air to flow along the inner surface of the outer partition and the outer surface of the inner partition. The heat exchanger recovers heat from the indoor air. The air intake and exhaust port is provided separately from the window and communicates with the outside. The outdoor air is passed between the outer partition and the flow straightener and between the flow straightener and the inner partition in sequence before being passed through the heat exchanger, or passed through the heat exchanger and then between the outer partition, the flow straightener and the inner partition in sequence, thereby recovering heat escaping from the inner partition and heat from the indoor air and taking it into the room, and the indoor air from which heat has been removed by the heat exchanger is discharged to the outside through the air intake and exhaust port , thereby preventing heat from escaping from the room through the window. In addition, the heat exchanger also complements the function of the window by recovering heat from the room, thereby reducing the heating load.

The ventilation system according to the invention described in claim 2 comprises a window, a heat exchanger, and an air intake and exhaust port . The window has an outer partition body, an inner partition body, and a flow regulator provided between the outer partition body and the inner partition body. Air flows along the outer surface of the inner partition body and the inner surface of the outer partition body to recover heat entering from the outer partition body. The air intake and exhaust port is provided separately from the window and communicates with the outside. The heat exchanger recovers heat from outside air introduced through the air intake and exhaust port . The inside air is passed through the heat exchanger. By passing the air in this order, either between the inner partition and the flow straightener and between the flow straightener and the outer partition, or between the inner partition and the flow straightener and between the flow straightener and the outer partition, and then through the heat exchanger, the heat entering from the outer partition and the heat of the outside air are recovered and discharged to the outside, and the outside air from which the heat has been removed by the heat exchanger is brought into the room, thereby preventing outside heat from entering through the window, and in addition, the heat exchanger also recovers heat from the outside air, complementing the function of the window, thereby reducing the cooling load.

FIG. 1 is a schematic diagram showing a first embodiment of a ventilation system of the present invention. FIG. 2 is a vertical cross-sectional view of the ventilation system. 2 is an enlarged vertical cross-sectional view of an upper portion of a window of the ventilation system. FIG. FIG. 4 is a schematic diagram showing a second embodiment of the ventilation system of the present invention. FIG. 13 is a schematic diagram showing a third embodiment of the ventilation system of the present invention. FIG. 2 is a vertical cross-sectional view of the ventilation system. 2 is an enlarged vertical cross-sectional view of an upper portion of a window of the ventilation system. FIG. FIG. 13 is a schematic diagram showing a fourth embodiment of the ventilation system of the present invention. FIG. 2 is a schematic diagram showing a reference example of a ventilation system of the present invention. (a) shows a room model used to calculate the heating and cooling loads, and (b) shows a window model. FIG. 13 is a diagram showing the ventilation path pattern of the ventilation system used in calculating the heating and cooling load. 13 is a graph showing the heating and cooling load ratio compared to the case where a simple double-glazed window is installed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Among the embodiments described below, the first embodiment (FIGS. 1 to 3) and the third embodiment (FIGS. 5 to 7) correspond to the embodiment of the invention described in claim 1, and the second embodiment (FIG. 4) and the fourth embodiment (FIG. 8) correspond to the embodiment of the invention described in claim 2.
1 to 3 show a first embodiment of the ventilation system of the present invention. This embodiment is applied to a ventilation system for an office building, and shows the operating state in winter. As shown in FIG. 1, this ventilation system includes a window (curtain wall) 1 installed in one wall, a heat exchanger 2 and an air conditioner 5 installed in the ceiling, an air supply and exhaust port 6 installed in the other wall, air intake and exhaust ports 7, 7 installed in the ceiling, and ducts 8a, 8b, 8c, 8d connecting them in the ceiling.

As shown in Figures 2 and 3, the window 1 is a double-glazed window comprising an outer window 9 fitted with an outer glass (outer partition) 3 and an inner window 10 fitted with an inner glass (inner partition) 4, and a blind 12 is hung from above as a flow regulator in the intermediate layer 11 between the outer window 9 and the inner window 10.
As shown in Figure 3, the exterior window 9 has an air vent 15a formed in the bottom wall on the outdoor side from the outer glass 3 of the upper frame 13, air vents 15b, 15b formed in the middle vertical wall, and an air vent 15c formed in the bottom wall on the indoor side from the outer glass 3, thereby providing an air vent 14 in the upper frame 13 that communicates from the outdoor space to the intermediate layer 11 on the outdoor side via the blinds 12. The air vent 14 has the outdoor side air vent 15a opening downward, and the indoor side air vent 15c facing diagonally downward toward the outer glass 3.
The inner window 10 has ventilation holes 20a, 20b formed in the outdoor side wall and upper wall of the upper frame 16, so that a ventilation section 17 is provided in the upper frame 16 that connects from the middle layer 11 on the indoor side of the blinds 12 to the space above the ceiling, and a duct 8a leading to the heat exchanger 2 is connected to the ventilation hole 20b.

The duct 8a connecting the ventilation section 17 of the inner window 10 and the heat exchanger 2 is equipped with a fan 18 that can rotate in both directions, as shown in Figure 2. In winter, the fan 18 is rotated to pull the air toward the heat exchanger 2, so that the air flows through the window 1 from the outside to the inside of the room. The cold outside air that flows in through the ventilation section 14 of the outer window 9 flows downward along the indoor side of the outer glass 3 as shown by the arrow in Figure 2, because the ventilation opening 15c on the indoor side of the ventilation section 14 is opened toward the inner circumference. The cold outside air then flows under the intermediate layer 11 by the cold draft, turns around, is warmed by the heat from the inside of the room transmitted from the inner glass 4, and rises along the outdoor side of the inner glass 4, during which the heat escaping from the inner glass 4 to the outside is collected by the air flow. Furthermore, when the window 1 is exposed to sunlight, the outside air can acquire solar heat as it flows through the intermediate layer 11 along the inside surface of the outer glass 3 and the outer surface of the inner glass 4. The heated outside air then passes through the ventilation section 17 at the top of the inner window 10 and is sent to the heat exchanger 2 through the duct 8a. The outside air, which was at 0°C, is heated to 12°C in this way by acquiring solar heat as it passes through the intermediate layer 11 of the window 1 and by recovering indoor heat from the inner glass 4.

In the heat exchanger 2, the outside air that has been warmed by passing through the window 1 as described above is subjected to heat exchange with the inside air taken in through the air inlet/outlet 7, so that the heat of the inside air is recovered by the outside air that has been warmed by passing through the window 1. As a result, the outside air that was 12°C is further warmed to 18.5°C. The outside air thus warmed is then warmed to 30°C by the air conditioner 5 and flows out into the room through the air inlet/outlet 7. Since the outside air is warmed to 18.5°C before being supplied to the air conditioner 5, the load on the air conditioner 5 can be reduced.
The inside air from which the heat has been removed is discharged to the outside through the air supply/exhaust port 6.

As described above, this ventilation system allows outside air to flow around the outer glass 3 and inner glass 4 inside the intermediate layer 11, thereby obtaining solar heat, and by using the air flow to collect heat transmitted from inside the room to outside and return it to the room, heat loss from inside to outside is almost eliminated, preventing heat transport from the inside to the outside, which is in the opposite direction to the air flow, and providing extremely high thermal insulation. Furthermore, by exchanging heat between the outside air that has collected heat by passing it through the window 1 and the inside air, the heat of the inside air can also be collected and returned to the room, complementing the function of the window 1 and further reducing the heating load.

The air conditioner 5 may be provided separately from the present ventilation system. That is, the ventilation system may not include an air conditioner, and the outside air discharged from the heat exchanger 2 may be introduced directly into the room.
1, a shortcut duct 19 that shortcuts the heat exchanger 2 is provided in the duct through which the outside air passes, and when the temperature of the outside air that has passed through the window 1 becomes higher than the room temperature due to strong solar radiation on the window 1, the air may be passed through this shortcut duct 19 and then passed through the air conditioner 5 without passing through the heat exchanger 2, or may be directly introduced into the room without passing through the heat exchanger 2 or the air conditioner 5. For example, when the temperature of the outside air that has passed through the window 1 is 22° C., which is higher than the room temperature of 20° C., the air is allowed to bypass the heat exchanger 2 and flow to the air conditioner 5, where it is adjusted to 30° C. before being introduced into the room. When the temperature of the outside air that has passed through the window 1 is 30° C., the air is allowed to bypass the heat exchanger 2 and the air conditioner 5 and directly introduced into the room.

Figure 4 shows a second embodiment of the ventilation system of the present invention. Like the first embodiment, this embodiment is applied to a ventilation system for an office building, and shows the operating state in summer. The ventilation system of the second embodiment has exactly the same device configuration as the first embodiment, and by rotating the fan 18 in the opposite direction, the air flows in the opposite direction to that of the first embodiment.

The heat exchanger 2 recovers heat from the outside air by exchanging heat between the warm outside air introduced through the air intake and exhaust port 6 and the cold inside air introduced through the air intake and exhaust port 7. As a result, the outside air that was 30°C is cooled to 26°C, and then cooled to 20°C by the air conditioner 5 and flows out into the room through the air intake and exhaust port 7.

The inside air that has recovered the heat from the outside air in the heat exchanger 2 is introduced through the duct 8a to the inside of the blinds 12 of the intermediate layer 11 of the window 1. Since this air is cooler than the outside, it flows downward along the outside side of the inside glass 4, then turns around at the bottom of the intermediate layer 11, and rises along the inside side of the outside glass 3 due to the heat transmitted from the outside glass 3, etc. During this time, the air flow recovers the heat that enters the room from the outside through the outside glass 3. The air is then released to the outside through the ventilation section 14 of the outer window 9. As the air passes through the ventilation section 14, the air flow recovers the heat that enters the room through the upper frame 13. Then, by releasing the air to the outside, the heat recovered from the outside glass 3 and the upper frame 13 is discarded to the outside. In this way, the heat transferred from the outside to the inside of the room is collected by the air flow and then discharged to the outside, allowing the heat that is trying to enter the room through the window 1 to be discharged. This prevents the transport of heat from the outside to the inside of the room, which is in the opposite direction to the air flow, and provides excellent insulation, keeping the room cool.

In this way, the ventilation system of this embodiment has inside air flowing around the outer glass 3 and inner glass 4 inside the intermediate layer 11, and the heat transferred from the outside to the inside of the room is collected by the air flow and discarded to the outside, thereby discharging heat that is trying to enter the room through the window 1. This prevents heat transport from the outside to the inside of the room, which is in the opposite direction to the air outflow, and provides very high thermal insulation. Furthermore, by collecting heat from the outside air using the heat exchanger 2 and discarding it to the outside, the function of the window 1 is complemented, further reducing the cooling load.

Figures 5 to 7 show a third embodiment of the ventilation system of the present invention. This embodiment is applied to a ventilation system for a house, and shows the operating state in winter. As shown in Figure 5, this ventilation system is equipped with a window 1 installed in one wall, a heat exchanger 2 installed in the attic, air supply and exhaust vents 6, 6 installed in one wall, air intake and exhaust vents 7 installed in the ceiling, and ducts 8a, 8b, 8c, 8d connecting them in the attic. An air conditioner 5 is installed separately from the ventilation system.

As shown in Figures 6 and 7, the window 1 is a double-glazed window comprising an outer window 9 and an inner window 10, and a blind 12 is hung from above as an intermediate layer between the outer window 9 and the inner window 10 as a flow regulator.
As shown in Fig. 7, a vent 14 is provided on the interior side of the upper frame 13 of the exterior window 9, which connects the space above the ceiling to the intermediate layer 11 on the exterior side through the blinds 12, and the vent 14 is provided with an opening toward the inner periphery. A duct 8c leading to the heat exchanger 2 is connected to the vent 14.
The inner window 10 has a ventilation section 17 in the upper frame 16 that communicates with the inside and outside of the room.

As shown in FIG. 6, the heat exchanger 2 exchanges heat between the cold outside air introduced through the air intake and exhaust port 6 and the inside air taken in through the air intake and exhaust port 7, recovering the heat from the inside air. As a result, the outside air, which was 0°C, is heated to 16°C. The outside air that has recovered the heat from the inside air is then guided to the intermediate layer 11 between the exterior window 9 and the blinds 12 via the duct 8c and ventilation section 14 mentioned above.

The outside air that enters the intermediate layer 11 flows downward along the indoor side of the outer glass 3, as shown by the arrow in FIG. 6, because the ventilation section 14 is opened toward the inner circumference. The cold outside air then flows under the intermediate layer 11 by cold draft, turns back, is warmed by the heat inside the room transmitted from the inner glass 4, and rises along the outdoor side of the inner glass 4, during which the heat escaping from the inner glass 4 to the outside is collected by the air flow. In addition, the outside air flows in this way along the inner side of the outer glass 3 and the outer side of the inner glass 4 inside the intermediate layer 11, so that it can obtain solar heat. The warmed outside air then flows through the ventilation section 17 at the top of the inner window 10 and flows out into the room. The outside air, which was at 16°C, is warmed to 18.5°C by obtaining solar heat while passing through the intermediate layer 11 of the window 1 and collecting indoor heat from the inner glass 4 in this way.

In this way, this ventilation system can obtain solar heat by having outside air flow around the outer glass 3 and inner glass 4 inside the intermediate layer 11, and by collecting heat transmitted from inside the room to the outside through the air flow and returning it to the room, there is almost no heat loss from inside to outside, which prevents heat transport from the inside to the outside, which is in the opposite direction to the air flow, and provides very high thermal insulation. Furthermore, by exchanging heat between the outside air and the inside air using the heat exchanger 2, the heat of the inside air can be collected and returned to the room by passing it through the window 1, which complements the function of the window 1 and further reduces the heating load.

Figure 8 shows a fourth embodiment of the ventilation system of the present invention. Like the third embodiment, this embodiment is applied to a residential ventilation system, and shows the operating state in summer. The ventilation system of the fourth embodiment has exactly the same device configuration as the third embodiment, and by rotating the fan 18 in the reverse direction, the air flows in the opposite direction to the third embodiment.

In the window 1, inside air flows through the vent 17 of the inner window 10 and into the intermediate layer 11 on the indoor side of the blinds 12. Since this air is cooler than the temperature outside, it flows downward along the outdoor side of the inner glass 4, then turns around at the bottom of the intermediate layer 11, and rises along the indoor side of the outer glass 3 due to the heat transmitted by the outer glass 3, etc. During this time, the heat coming into the room from the outside through the outer glass 3 is collected by the air flow. As a result, the inside air temperature is heated from 25°C to 27°C.
The inside air that has collected heat from the window 1 is then sent to the heat exchanger 2, where it exchanges heat with the outside air to collect the heat from the outside air. As a result, the inside air, which was 27°C, is heated to 29°C and discharged to the outside through the air intake and exhaust vent 6. Meanwhile, the outside air from which the heat has been removed is cooled from 30°C to 28°C and flows into the room through the air intake and exhaust vent 7.

In this way, the ventilation system of this embodiment has inside air flowing around the outer glass 3 and inner glass 4 inside the intermediate layer 11, and the heat transferred from the outside to the inside of the room is collected by the air flow and discarded to the outside, thereby discharging heat that is trying to enter the room through the window 1. This prevents heat transport from the outside to the inside of the room, which is the opposite direction to the air outflow, and provides very high thermal insulation. Furthermore, by collecting heat from the outside air using the heat exchanger 2 and discarding it to the outside, the function of the window 1 is complemented, further reducing the cooling load.

As shown in FIG. 8, the ventilation system of this embodiment is provided with a shortcut duct 19 that shortcuts the heat exchanger 2 in the duct through which the inside air passes, and when the temperature of the inside air that passes through the window 1 becomes higher than the outside air temperature due to strong solar radiation on the window 1, the air can be discharged directly to the outside by passing through this shortcut duct 19 without passing through the heat exchanger 2. For example, when the temperature of the inside air that passes through the window 1 is 32°C, which is higher than the outside air temperature of 30°C, the air is discharged directly to the outside without passing through the heat exchanger 2.

Figure 9 shows a reference example of the ventilation system of the present invention. This reference example is applied to a residential ventilation system like the third and fourth embodiments, and shows the operating state in summer. This reference example has exactly the same device configuration as the fourth embodiment, but the air flow direction is opposite to that of the fourth embodiment. In the first to fourth embodiments, air is made to flow through the window 1 in the opposite direction to the direction of heat transfer (from inside to outside in winter, and from outside to inside in summer), and this prevents heat transport in the opposite direction to the air flow, making the window 1 insulating. However, in this reference example, air is made to flow through the window 1 in the same direction as the direction of heat transfer (from outside to inside).

The heat exchanger 2 exchanges heat between the outside air introduced through the air intake and exhaust port 6 and the inside air introduced through the air intake and exhaust port 7, recovering the heat from the outside air. As a result, the outside air, which was 30°C, is cooled to 26°C. The inside air that has recovered the heat is warmed to 29°C and discharged to the outside through the air intake and exhaust port 6.

The outside air that has had heat removed by passing through the heat exchanger 2 is guided to the intermediate layer 11 on the outside of the blinds 12 and flows downward along the indoor side of the outer glass 3. It then flows under the intermediate layer 11 due to the cold draft, turns around, and rises along the outdoor side of the inner glass 4, during which time the air flow collects the cold that escapes from the inner glass 4 to the outside. It then flows into the room through the ventilation section 17 at the top of the inner window 10.

In this way, the ventilation system of this embodiment passes the outside air that has had its heat removed by the heat exchanger 2 through the window 1, and the air flows in a detouring manner along the inside surface of the outer glass 3 and the outer surface of the inner glass 4, recovering the cold heat escaping from the inner glass 4 and taking it inside the room, and expelling the inside air that has recovered the heat from the outside air to the outside, thereby keeping the room cool and reducing the cooling load. This reference example has the same configuration as the third embodiment shown in Figure 5, and the direction of air flow remains the same, so that insulation effects can be obtained even in summer, making it low cost. This embodiment is effective when the window 1 is not exposed to strong sunlight, such as when the window 1 is installed facing north.

In order to confirm the effect of the present invention, the results of calculations were made to see how much the cooling and heating load can be reduced when the ventilation system of the present invention is adopted. The calculations were performed using TRNSYS17, a commercially available thermal ventilation circuit network calculation software.
Figure 10(a) shows a model of the room used in the calculation. As shown in the figure, the room has a window 1 on the entire south side, the size of the window 1 is 1690 mm wide x 1370 mm high, the size of the room is 1690 mm wide x 1370 mm high x 3000 mm deep, and the surrounding walls are thermally insulated boundaries.
Figure 10(b) shows a model of the window 1 used in the calculation. The outer window 9 is made of aluminum sash and single-pane glass (outer glass), the inner window 10 is made of plastic sash and double-glazed glass (inner glass), and honeycomb blinds 12 are installed in the intermediate layer 11. The flow rate of air flowing through the window 1 is set to 12 ^m3 /h.
FIG. 11 shows the pattern of the ventilation path of the ventilation system used in the calculation. Example 1 shown in FIG. 11(a) is similar to the first embodiment shown in FIG. 1, in which outside air is passed through a window and then through a heat exchanger, and then introduced into the room. Example 2 shown in FIG. 11(b) is similar to the second embodiment shown in FIG. 4, in which inside air is passed through a heat exchanger and then through a window, and then discharged to the outside. Example 3 shown in FIG. 11(c) is similar to the third embodiment shown in FIG. 5, in which outside air is passed through a heat exchanger and then through a window, and then introduced into the room. Example 4 shown in FIG. 11(d) is similar to the fourth embodiment shown in FIG. 8, in which inside air is passed through a window and then through a heat exchanger, and then discharged to the outside. Reference Example 1 shown in FIG. 11(e) is similar to the reference example shown in FIG. 9, in which outside air is passed through a heat exchanger and then through a window, and then introduced into the room. Comparative Example 1 shown in FIG. 11(f) is a simple double-glazed window that does not allow either outside or inside air to pass through.
As the calculation conditions, Sapporo was selected as a representative cold region and Miyazaki as a representative warm region, and the heating and cooling loads for a typical day were calculated as follows for the above-mentioned Example, Reference Example, and Comparative Example.
・Cold region (Sapporo) February 19th Daily average temperature: -9.9℃
・Warm area (Miyazaki) July 22nd, average daily temperature: 30.9℃

FIG. 12 is a graph showing the ratio of heating and cooling loads for the Example and Reference Example, based on the values of heating and cooling loads calculated for the Example, Reference Example, and Comparative Example, with the heating and cooling load for a case where a double-glazed window is simply installed (Comparative Example 1) set to 100%.
As is clear from the figure, according to Examples 1 and 3, the heating load can be reduced compared to the case where a simple double-glazed window is installed (Comparative Example 1) (reduction rate: 51% in Example 1, 36% in Example 3). In comparison between Example 1, in which the outside air is passed through the window and then through the heat exchanger, and Example 3, in which the outside air is passed through the heat exchanger and then through the window, Example 1, in which the air is passed through the window first, is more effective in reducing the heating load.
Moreover, according to Examples 2 and 4, it is found that the cooling load can be reduced compared to the case where a simple double-glazed window is installed (Comparative Example 1) (reduction rate is 20% in Example 2 and 14% in Example 4). In comparison between Example 2, in which the inside air is passed through the heat exchanger and then through the window, and Example 4, in which the inside air is passed through the window and then through the heat exchanger, Example 2, in which the inside air is passed through the heat exchanger first, is more effective in reducing the cooling load.
Also, for Reference Example 1, although it was inferior to Examples 2 and 4, the effect of suppressing the cooling load was confirmed.

As described above, this ventilation system (first and third embodiments) comprises a window 1 and a heat exchanger 2. The window 1 has an outer partition (outer glass) 3 and an inner partition (inner glass) 4. Air flows along the inner surface of the outer partition 3 and the outer surface of the inner partition 4 to recover heat escaping from the inner partition 4. The heat exchanger 2 recovers heat from the inside air. By passing outside air through the window 1 and then through the heat exchanger 2, or through the heat exchanger 2 and then through the window 1, heat escaping from the inner partition 4 and heat from the inside air are recovered and taken into the room, and the inside air whose heat has been removed by the heat exchanger 2 is discharged to the outside, thereby preventing heat from escaping from the room through the window 1. In addition, the heat exchanger 2 also recovers heat from the room, complementing the function of the window 1, thereby reducing the heating load.

This ventilation system (second and fourth embodiments) comprises a window 1 and a heat exchanger 2. The window 1 has an outer partition (outer glass) 3 and an inner partition (inner glass) 4. Air flows along the outer surface of the inner partition 4 and the inner surface of the outer partition 3 to recover heat entering from the outer partition 3. The heat exchanger 2 recovers heat from outside air. By passing inside air through the heat exchanger 2 and then through the window 1, or through the window 1 and then through the heat exchanger 2, the heat entering from the outer partition 3 and the heat of the outside air are recovered and discharged to the outside. The outside air whose heat has been removed by the heat exchanger 2 is taken into the room, so that outside heat is prevented from entering through the window 1. In addition, the heat exchanger 2 also recovers heat from the outside air, complementing the function of the window 1, and the cooling load can be reduced.

The first embodiment (Fig. 1) and the second embodiment (Fig. 4) are suitable for relatively large office buildings and the like where there is space for duct piping, while the third embodiment (Fig. 5) and the fourth embodiment (Fig. 8) are suitable for relatively small homes and the like where there is little space for piping and where duct piping is preferred where possible.

The present invention is not limited to the above-described embodiment. The structure of the window can be changed as appropriate, and is not limited to a double-glazed window having an outer window and an inner window, but can also be a single sash in which the outer glass and the inner glass are supported by a single frame (frame, stile, etc.).
The outer partition may be any partition that separates the outdoor space from the intermediate layer, and may be, in addition to outer glass, a shutter, a rain shutter, a roller screen, etc. The inner partition may be any partition that separates the intermediate layer from the indoor space, and may be, in addition to inner glass, a curtain, a roller screen, a paper screen, etc.
The ventilation sections connecting the outdoor space to the middle layer and the ventilation sections connecting the middle layer to the indoor space may be formed anywhere, for example, they may be provided in the vertical frame or lower frame, or the gap between the upper frame and the upper frame may be used as the ventilation section through which air flows in and out.
The ventilation system of the present invention may be one in which air flows through a window only from the outside to the inside, only from the inside to the outside, or in both directions, from the outside to the inside and from the inside to the outside.

1 Window 2 Heat exchanger 3 Outer glass (outer partition)
4. Inner glass (inner partition)

Claims (2)

a heat exchanger and an intake and exhaust port ; the window has an outer partition, an inner partition, and a flow straightener provided between the outer partition and the inner partition, and recovers heat escaping from the inner partition by allowing air to flow along the inner surface of the outer partition and the outer surface of the inner partition; the heat exchanger recovers heat from the inside air; the intake and exhaust port is provided separately from the window and in communication with the outside; the outside air is passed sequentially between the outer partition and the flow straightener and between the flow straightener and the inner partition before being passed through the heat exchanger, or passed through the heat exchanger and then between the outer partition and the flow straightener and between the flow straightener and the inner partition, thereby recovering heat escaping from the inner partition and heat from the inside air and taking it into the room, and the inside air from which heat has been removed by the heat exchanger is discharged to the outside through the intake and exhaust port . A ventilation system comprising a window, a heat exchanger, and an air intake and exhaust port , the window having an outer partition, an inner partition, and a flow straightener provided between the outer partition and the inner partition, and recovering heat entering from the outer partition by air flowing along the outer surface of the inner partition and the inner surface of the outer partition , the air intake and exhaust port being provided separately from the window and communicating with the outside, the heat exchanger recovering heat from the outside air introduced from the air intake and exhaust port , the inside air being passed through the heat exchanger and then passed between the inner partition and the flow straightener and between the flow straightener and the outer partition in order, or between the inner partition, the flow straightener and the outer partition in order, and then passed through the heat exchanger, thereby recovering heat entering from the outer partition and heat from the outside air and discharging it to the outside, and taking in the outside air from which heat has been removed by the heat exchanger into the room.

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