JP2006029733A - Both cold and hot season ventilating system utilizing heat collecting duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilating system having high heat collecting efficiency and low cost while saving space by serving a heat collecting duct for both cold and hot season ventilation. <P>SOLUTION: The ventilating system has an air passage ranging from the heat collecting duct provided on an outdoor side to an indoor space. The heat collecting duct 32 has a ventilating mouth portion 36 at the front end, oriented upward. In the air passage 10, air in the heat collecting duct 32 inflates and flows from the inside to the outside of a building in a hot season and it flows from the outside to the inside in a cold season with a blowing fan 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ventilation system for both hot and cold periods using a heat collection duct, and more particularly to a ventilation system using a chimney effect.

  In order to save energy in the ventilation system in the cold season, an air flow path is formed obliquely along the lower surface of the roof plate that also serves as a heat collecting part, with the lower surface opening and the lower surface side shielded by a heat insulating material. There is known a structure in which the air is communicated with a floor outlet through a duct, and the air heated by the roof plate is collected in the air flow path and blown out from the floor outlet (Patent Document 1).

  In addition, in order to use solar energy for ventilation in the hot season, a vertical shaft that also serves as a sunlight receiving part is installed vertically as part of the building, and ventilates to the outside through the vertical shaft from each floor of the building due to the chimney effect Is also known (Patent Document 2).

Although not a ventilation system, an inner tube as a heat medium flow path for water or the like is provided in a transparent outer tube in a double cylinder shape, and a vacuum heat insulating space is formed between these inner and outer tubes, and the space A heat collecting tube is known which has a strip shape long in the passage direction and is provided with a heat collecting plate in which the inner tube is fitted in a fitting groove provided in the middle in the width direction ( Patent Document 3).
JP 2002-235955 A JP 2002-194826 No. 58-9738

    The ventilation systems of Patent Literature 1 and Patent Literature 2 are for the cold season or the hot season, respectively. However, if these are constructed separately, a large space is required, and the design of the system becomes troublesome. In addition, as shown in Patent Document 3, if the technology of a heat collecting tube having a large heat concentration effect is applied to a ventilation system, it is expensive to form a duct having the size of a duct with a transparent material such as glass or acrylic resin. Therefore, it is uneconomical to install the system in a cold season system and a hot season system, respectively.

    Accordingly, the present invention provides an air passage from an outdoor heat collection duct to an indoor space in order to provide a heat collection efficiency and ventilation system with low cost and space saving by using the heat collection duct for both the cold season and the hot season. In the ventilation system having the above, the air passage is moved from the inside of the building to the outside by the expansion of the air in the heat collecting duct with the tip opening facing upward in the hot season, and from the outside to the inside by the blower fan 8 in the cold season. It is intended to be configured to ventilate.

    The first means is a ventilation system having an air passage extending from a heat collection duct provided outdoors to an indoor space, and the heat collection duct 32 is oriented with the ventilation port 36 on the tip side facing upward. The air passage 10 is configured to ventilate from the inside of the building due to the expansion of the air inside the heat collecting duct 32 in the hot season and from the outside to the inside by the blower fan 8 in the cold season.

    In the “heat collecting duct”, a heat insulating part (or a heat insulating band) may be formed on the lower wall part side over the entire length of the duct, and the upper wall part of the duct may be a transparent part. The transparent part can be formed of glass or a transparent acrylic resin. The heat collection duct can be formed in a cylindrical shape such as a cylindrical shape or a quadrangle, and the heat insulating portion is formed in, for example, a semicylindrical shape, a cross-section concave shape or a flat plate shape along the inner surface of the lower half portion of the heat collection duct. It is good to form. Further, a heat storage layer preferably formed of a latent heat storage material is formed on the inner surface of the heat insulating portion.

    The heat collecting duct is installed with a certain gradient with respect to the horizontal plane. The gradient is most preferably set so that the light beam at that time and the light receiving surface of the heat collecting plate are perpendicular to each other, corresponding to the solar altitude around the winter time at the installation site in winter. In the same latitude region, the gradient from the horizontal plane is about 60 degrees. Of course, the gradient can be changed as appropriate according to the conditions of the installation location. For example, when the installation space is not sufficient, it is possible to install it almost vertically along the outer wall of the building.

  The second means includes the first means, and the air passage 10 is bifurcated 52 from the base end side of the heat collecting duct 32 to branch into the air outlet 56 and the air supply in the indoor space A. The first ventilation path 30 communicating with each of the ports 20 and the second ventilation port 74 provided separately from the heat collecting duct 32 are bifurcated 76 to communicate with the exhaust port 56 and the air supply port 20 respectively. 2) By switching the flow path switching dampers 58, 62, 80, 84 installed in the branch section of both ventilation paths, ventilation from the inside of the building to the outside through one of the ventilation paths When it does, it is provided so as to ventilate from the outside of the building through the other.

  The third means includes the second means, and the air passage 10 further returns the return air from the indoor space A to the air conditioner 2 and supplies conditioned air from the air conditioner to the indoor space A. A circulation type air-conditioning channel 12 to be ventilated, one of the branch portions of the first and second ventilation channels 30, 70 is connected to the air conditioner 2 of the circulation ventilation channel, and the other is an indoor space It is connected to the exhaust opening that opens to A.

  The fourth means includes the second means or the third means, and the heat collecting duct 32 is installed at a position higher than the exhaust port 56 of the indoor space.

  The fifth means includes any one of the first means to the fourth means, and the air path 10 communicates with the end portion side of the heat collecting duct 32 and extends in the indoor space A. And an air supply / exhaust duct 22 having an air supply port 24 and an exhaust port 25, and a damper 26A, 26B for switching the flow path between the heat collection duct 32 and each of the air supply ports 24 to 25. In addition, ventilation openings 28 are opened at appropriate positions in the indoor space A.

  It is sufficient to provide at least one “air supply port” and “exhaust port”, but as an exhaust port, an exhaust port for forced exhaust with an exhaust fan and a natural air without such an exhaust fan are provided. It is desirable that an appropriate number of two types of exhaust ports for exhaust are provided, and exhaust is performed through the former in the forced exhaust mode and through the latter in the natural exhaust mode. The switching between the two modes is based on the concentration of pollutants such as carbon dioxide in the indoor space. When the concentration is above the reference value, the forced exhaust mode is selected. When the concentration is below the reference value, the natural ventilation mode is selected. Can be done.

    The sixth means includes any one of the first means to the fifth means, and at least the upper wall portion of the heat collecting duct 32 serves as the light transmitting portion 38, and receives light facing the light transmitting portion. A heat collecting plate 44 having a surface 46 is installed in the heat collecting duct.

  The “heat collecting plate” is preferably formed of iron or other metal that easily absorbs heat and emits heat, and the surface of the heat collecting plate is a highly heat-absorbing photoselective paint (for example, black chrome having an absorption rate of 0.98). Apply plating). Further, it is preferable to provide an allowance for air flow path formation between the upper surface of the heat collecting plate and the lower surface of the upper wall portion of the transparent duct, and between the lower surface of the heat collecting plate and the upper surface of the lower wall portion of the transparent duct.

  The seventh means includes any one of the first to sixth means, and the heat collecting duct 32 is capable of adjusting an inclination angle with respect to a horizontal plane.

The invention according to the first means of the present invention has the following effects.
-Since the heat collection duct 32 is shared with the exhaust ventilation path for the hot season and the ventilation path for the outside air introduction during the cold season, one heat collection duct can be used throughout the year, which is economical and has an initial cost. Can be reduced.
○ Since the heat collection duct 32 is oriented with the first ventilation port 36 opening on the tip side facing upward, the air between the heat collection duct 32 and the inside of the air passage section excluding the heat collection duct during the hot season Air can be exhausted from the indoor space A using the chimney effect due to the difference in density, and in the cold season, outdoor cold air can be heated and sent indoors using a heat collection duct, Contributes to energy saving.

  According to the second aspect of the invention, since the first ventilation path 30 and the second ventilation path 70 that allow the air flow in opposite directions to the inside and outside of the building are provided, the exhaust in the hot season through the heat collecting duct 32 Corresponding to the outside air introduction in the cold season, the outside air introduction in the hot season and the exhaust in the cold season can be performed via the second ventilation port 74, and a more comfortable and efficient thermal environment can be realized.

  According to the invention relating to the third means, since the first and second ventilation paths 30, 70 are connected to the circulation type air conditioning flow path 12 with the air conditioner 2, energy saving is achieved by combining natural ventilation and mechanical ventilation. Can constitute a highly efficient ventilation system.

  According to the fourth aspect of the invention, since the heat collection duct 32 is installed at a position higher than the exhaust port 56 in the indoor space, the first ventilation port 36 and the exhaust port 56 of the heat collection duct 32 are connected to each other. By utilizing the potential energy between them, the above-mentioned chimney effect can be increased and the ventilation effect can be enhanced.

  According to the fifth aspect of the invention, since air supply / exhaust is performed through the single air supply / exhaust duct 22, a system with a simple configuration suitable for ventilation in factories, warehouses, gymnasiums, etc. can be provided. .

  According to the sixth aspect of the invention, since the heat collecting plate 44 is provided in the heat collecting duct 32, the required length of heat and the duct length required for acquisition are reduced, and transparent for forming an expensive duct. It is economical because it can save material.

  According to the invention relating to the seventh means, since the heat collecting duct 32 can adjust the inclination angle with respect to the horizontal plane, an inclination angle which is suitable mainly in relation to the solar altitude in the winter, A suitable inclination angle in relation to a required chimney effect can be selected, and the heat collection state can be optimized for each season.

  1 to 3 show a ventilation system according to a first embodiment of the present invention. In the figure, A is an indoor space of a building to be ventilated and air-conditioned, B is a machine room, C is a partition wall between the indoor space and the machine room, and D is a rooftop.

  This system includes an air conditioner 2 and an air passage 10.

  The air conditioner 2 is a well-known one, and includes a filter 4, a heating / cooling device 6 such as an air conditioning coil, and a blower fan 8.

  The air passage 10 includes a circulation type air conditioning passage 12, a first ventilation passage 30, and a second ventilation passage.

  The air conditioning channel 12 is a well-known one, and indoor air sucked from the return air opening 14 opened above the partition wall C is supplied to the air conditioner 2 installed in the machine room B through the return air duct 16. The air is blown, and the air is supplied to the indoor space A from the air supply port 20 through the air supply duct 18.

  The first ventilation path 30 described above is formed by the heat collection duct 32, the connection duct 50, the first branch path portion 54, and the second branch path portion 60.

  The heat collecting duct 32 protrudes obliquely upward from the upper end of the connection duct 50 on the roof D of the building, and the lower part of the heat collecting duct 32 is held by support means (not shown). Further, the tip of the illustrated heat collecting duct 32 is a short cylindrical portion 34 extending in the horizontal direction as a measure against rain, and the tip of the short cylindrical portion is a first ventilation port 36. But the structure of this front-end | tip part can be changed suitably. As shown in FIG. 3, the heat collecting duct portion excluding the tip portion is formed in a square tube shape, and its upper wall portion is a transparent portion 38 formed of transparent acrylic or glass, and the cylindrical wall portion excluding the upper wall portion. Is a heat insulating portion 40 having a concave cross section. Further, the upper surface of the bottom wall portion 40a of the heat insulating portion is covered with a heat storage layer. The heat storage layer 42 has a shape retaining property that does not separate from the bottom wall portion of the heat insulating portion when the heat collecting duct is inclined. A heat collecting plate 44 having a light receiving surface 46 on the upper surface is provided on the cylindrical wall of the heat collecting duct 32, and the light receiving surface 46 faces the light transmitting portion 38. Further, the heat collecting plate 44 is fixed at an appropriate position of the heat insulating portion via a connector 48 formed of a heat insulating material as shown in FIG. 3, and the lower surface of the heat collecting plate 44 and the upper surface of the bottom wall portion of the heat insulating portion. And an air flow path is interposed between the upper surface of the heat collecting plate 44 and the lower surface of the light transmitting portion 38, respectively.

  The connection duct 50 penetrates the wall portion of the building roof and hangs down into the machine room B, and is bifurcated at the lower end thereof, and the first and second branches are branched through the branch point 52. It communicates with the road parts 54,60.

  The first branch path portion 54 opens from the branch point 52 to an exhaust port 56 that opens to the top of the partition wall C, and a first flow path switching damper 58 is provided in the middle thereof. In the illustrated example, a flow path portion from the first flow path switching damper 58 to the exhaust port 56 in the first branch path portion is a shared flow path with a third branch path portion to be described later.

  The second branch path portion 60 is opened from the branch point 52 to the air conditioner 2, and a second flow path switching damper 62 is provided in the middle of the second branch path portion 60. In the illustrated example, the flow path portion from the second flow path switching damper 62 to the air conditioner 2 in the second branch path portion is a shared flow path with a later-described fourth branch path portion.

  The second ventilation path 70 described above includes a ventilation duct 72, a third branch path portion 78, and a fourth branch path portion 82.

  The ventilation duct 72 has a second ventilation opening 74 opened to the outside of the building and hangs down into the machine room B described above, and is bifurcated at the lower end thereof. The fourth branch path portions 78 and 82 communicate with each other.

  The third branch path portion 78 opens from the branch point 76 to the exhaust port 56 described above, and a third flow path switching damper 80 is provided in the middle thereof.

  The fourth branch path portion 82 is opened to the air conditioner 2 from the branch point 76, and a fourth flow path switching damper 84 is provided in the middle portion thereof.

  In the above configuration, when sunlight hits the light receiving surface 46 of the heat collecting plate 44 through the light transmitting portion 38 as shown in FIGS. 1 to 2, the solar energy is mainly transmitted from the light receiving surface to the light transmitting portion 38 side by convection. While diffusing into the air flow path portion, it is emitted from the back surface of the heat collecting plate 44 to the air flow path portion on the heat insulating portion 40 side by radiation.

  In the cold season such as winter, the first and fourth flow path switching dampers 58 and 84 are closed and the second and third flow path switching dampers 62 and 80 are opened as shown in FIG. 8 is operated, air circulates in the air conditioning flow path 12 as indicated by an arrow, and in the first ventilation path 30, the outside air flows from the first ventilation opening 36 to the heat collecting duct 32 as indicated by a black arrow in FIG. Since it enters the air conditioner 2 through the connection duct 50, the branch point 52, and the second flow path switching damper 62, the amount of heat released from the heating / cooling device 6 can be reduced. Further, in the second ventilation path 70, the air from the air supply port 20 causes the dirty air in the upper part of the indoor space A to be pushed into the exhaust port 56, and from the exhaust port, as indicated by the white arrow. It is discharged from the second ventilation port 74 through the three-channel switching damper 80, the branch point 76, and the ventilation duct 72.

  In the hot season such as summer, as shown in FIG. 2, the second and third flow path switching dampers 62 and 80 are closed, the first and fourth flow path switching dampers 58 and 84 are opened, and the blower fan 8 is operated. Then, in the second ventilation path 70, outside air enters the air conditioner 2 from the second ventilation port 74 through the ventilation duct 72, the branch point 76, and the fourth flow path switching damper 84, as indicated by the white arrow, It flows into the airflow circulating in the road 12. Further, due to the supply of air from the air supply port 20 of the air conditioning channel, the heat reservoir in the upper part of the indoor space A passes from the exhaust port 56 to the first channel switching damper 58, the branch point 52, the connection duct 50, and further. The air is exhausted from the first ventilation port 36 through the heat duct 32. At this time, the air in the heat collecting duct 32 is expanded by the solar heat and has a specific gravity lighter than the air in the indoor space, so that a chimney effect is produced, and the first ventilation path 30 extends from the air-conditioned space A to the first ventilation port 36. Air is attracted to the side, and the energy consumption of the blower fan 8 of the air conditioner 2 is reduced.

  In the illustrated example, only the action of the combination of natural ventilation and mechanical ventilation is shown. However, the air conditioning system is not necessarily essential, and the indoor space A can be used even in the hot season, except in the case where the level of cold and hot weather is significant. By opening a window (not shown) installed at the right place, ventilation can be obtained through the window due to the chimney effect of the heat collection duct. A can be sent to A.

  Hereinafter, other embodiments of the present invention will be described. Among the configurations of these embodiments, the same items as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  4 to 5 show a second embodiment of the present invention. This system is a simple system that omits the air conditioners described above and supplies and exhausts air with a single air supply and exhaust duct instead of the first and second ventilation paths. Especially, ventilation in factories, warehouses, gymnasiums, etc. It is suitable as a system.

  As shown in FIG. 4, the air passage 10 of the present embodiment projects the heat collection duct 32 obliquely from the upper end portion of the connection duct 50 that penetrates the wall portion on the building roof, and the indoor area from the lower end portion of the connection duct 50. An air supply / exhaust duct 22 extending horizontally in the upper part of A is provided. The air supply / exhaust duct 22 has one air supply port 24 and two exhaust ports 25A and 25B. One of these exhaust ports is a forced exhaust port 25B provided with a blower fan 27, and the other is a natural exhaust port 25A having no blower fan. The air supply port 24 is also provided with a blower fan 8. Further, flow path switching dampers 26A, 26B, and 26C are attached to the upstream side of the air supply and exhaust ports 24 and 25, respectively. The installation path of the air supply / exhaust duct 22 can be changed as appropriate, and the number of forced exhaust ports and natural exhaust ports can be changed as appropriate. The indoor space A has an air supply / exhaust vent 28. Further, although not shown in the drawing, the system detects the concentration of pollutants such as carbon dioxide in the indoor space, and changes the direction of each flow path switching damper according to the concentration to change to the forced exhaust mode. And a control device for switching between the natural ventilation mode.

  In the above configuration, in the hot season, the flow path switching damper 26A with the air supply port 24 is closed as shown in FIG. 4, and when the carbon dioxide concentration is 1000 ppm or less, the flow path switching damper 26C with the forced exhaust port 25B is closed. Is closed, and the flow path switching damper 26B with the natural exhaust port 25A is opened, so that outside air enters the indoor space A from the ventilation port 28, and the chimney effect of the heat collecting duct 32 allows natural air to flow from the indoor space. The air is exhausted from the ventilation port 36 through the exhaust port 25A, the supply / exhaust duct 22, the connection duct 50, and the heat collection duct 32 to the outside. When the carbon dioxide concentration is 1000 ppm or more, the flow path switching damper 26C with the forced exhaust port 25B is opened, the flow path switching damper 26B with the natural exhaust port 25A is closed, and the blower fan with the forced exhaust port 25B. When 27 is driven, the air containing the pollutant in the indoor space A is forcibly exhausted to the outside air through the forced exhaust port 25B.

  In the cold season, the flow path switching dampers 26B and 26C with the exhaust ports 25A and 25B are closed, the flow path switching damper 26A with the air supply port 24 is opened, and the air supply port 24 is opened as shown in FIG. When the attached blower fan 8 is driven, the outside air is blown into the indoor space A from the ventilation port 36 through the heat collecting duct 32 and is exhausted from the indoor space through the ventilation port 28.

  6 and 7 show a third embodiment of the present invention. In the present embodiment, the heat collecting duct portion excluding the front end portion is used as a transparent straight tube portion 64, and the heat collecting plate 44 is rotatably installed therein. A semi-cylindrical fitting groove 44a is formed in the longitudinal intermediate portion of the heat collecting plate, as shown in FIG. 7, and bearings 66a attached to both ends of the straight tube portion 64 in the fitting groove. A transparent rotating shaft 68 constructed between 66b is fitted. The bearing 66a on the upper end side is formed so as to allow ventilation. Further, the lower end side of the rotary shaft 68 protrudes downward and outwardly through the bearing 66b, and an electric motor 88 is connected to the protruding rod portion. The light receiving surface of the heat collecting plate is controlled by a control device (not shown). It is provided to follow the sun and change direction. In this embodiment, a semi-cylindrical heat insulating portion 40 is slidably inserted in the circumferential direction along the inner surface portion of the straight cylindrical portion between both end portions of the heat collecting plate, and this heat insulating portion installation location is excluded. The straight tube portion is a translucent portion 38.

  FIG. 8 shows a fourth embodiment of the present invention, in which the base end portion of the heat collection duct 32 is pivotally attached to an appropriate place of the building, and the gradient of the heat collection duct 32 is changed according to the change in season. It can be changed. That is, in the cold season, as shown by the solid line, the light receiving surface 46 of the heat collecting plate 44 has a gradient that allows sunlight to be received at right angles to the solar altitude, while in the hot season, the heat collecting duct is almost vertical. It is possible to increase the height of the heat collection duct as shown in the figure and enhance the chimney effect. In this case, although the heat collecting performance is slightly lowered by setting the heat collecting duct to be vertical, the inside of the heat collecting duct 32 becomes very high in the hot season, so there is almost no problem. The present embodiment is useful in an area where the solar altitude in winter is relatively high (in other words, the gradient of the heat collecting duct perpendicular to the sunlight is small).

    For example, as shown in FIG. 3, a pair of support plates 90 erected from the roof D may be pivotally mounted 92 on both side surfaces of a heat collecting duct 32 having a rectangular tube shape as shown in FIG. Further, the lower end surface of the heat collecting duct and the connection duct 50 may be connected by a bendable pipe portion 94.

FIG. 3 is a conceptual diagram showing the action in the cold season of the ventilation system of the first embodiment of the present invention. It is a conceptual diagram which shows the effect | action of the hot season of the system of FIG. It is principal part sectional drawing of the system of FIG. It is a conceptual diagram which shows the effect | action of the hot season of the ventilation system of 2nd Embodiment of this invention. It is a conceptual diagram which shows the effect | action of the system of FIG. 4 in the cold season. FIG. 5 is a cross-sectional view of a main part of a system of a second embodiment of the present invention. It is a vertical side view of the principal part of FIG. It is a principal part action | operation figure of the system of the 3rd Embodiment of this invention.

Explanation of symbols

A ... Indoor space, B ... Machine room, C ... Partition wall, D ... Rooftop 2 ... Air conditioner 4 ... Filter 6 ... Heating cooler 8 ... Blower fan
10 ... Air passage 12 ... Air conditioning passage 14 ... Return air port 16 ... Return air duct
18 ... Air supply duct 20 ... Air supply port 22 ... Air supply / exhaust duct 24 ... Air supply port 25 ... Exhaust port
26A, 26B, 26C ... Flow path switching damper 27 ... Blower fan 28 ... Ventilation opening
30 ... 1st ventilation path 32 ... Heat collection duct 34 ... Short tube part 36 ... 1st ventilation port 38 ... Translucent part
40 ... Insulating part 40a ... Bottom wall part 42 ... Heat storage layer 44 ... Heat collecting plate 44a ... Fitting groove part
46 ... Light receiving surface 48 ... Connector 50 ... Connection duct 52 ... Branch point 54 ... First branch section
56 ... Exhaust port 58 ... First flow path damper 60 ... Second branch section
62 ... 2nd flow path switching damper 64 ... Straight cylinder part 66a, 66b ... Bearing 68 ... Rotating shaft
70 ... Second ventilation path 72 ... Ventilation duct 74 ... Second ventilation port 76 ... Branching point
78 ... Third branch section 80 ... Third flow path switching damper 82 ... Fourth branch section
84 ... 4th flow path switching damper 88 ... Electric motor
90 ... Support plate 92 ... Pivoting part 94 ... Bent tube

Claims (7)

    In the ventilation system having an air passage from an outdoor heat collection duct to an indoor space, the heat collection duct 32 is oriented with the mouth 36 for ventilation on the front end side facing up, and the air passage 10 Is a hot and cold season using a heat collecting duct that is configured to ventilate from the inside of the building to the outside by the expansion of the air in the heat collecting duct 32 in the hot season and from the outside to the inside by the blower fan 8 in the cold season. Dual ventilation duct.   The air passage 10 includes a first ventilation passage 30 that bifurcates 52 from the base end side of the heat collection duct 32 and communicates with the exhaust port 56 and the air supply port 20 of the indoor space A, and a heat collection duct. 32 and a second ventilation path 70 bifurcated from a second ventilation opening 74 provided separately from the second ventilation opening 70 and communicating with the exhaust opening 56 and the air supply opening 20, respectively. By switching the flow path switching dampers 58, 62, 80, 84 installed in the building, it is possible to ventilate from the inside of the building to the outside through the other when one of the two ventilation paths is ventilated from the inside to the outside. The ventilation system for both hot and cold periods using the heat collecting duct according to claim 1, wherein   The air passage 10 further includes a circulation type air conditioning flow path 12 for returning the return air from the indoor space A to the air conditioner 2 and supplying air conditioned air from the air conditioner to the indoor space A. One of the branch portions of the second ventilation passages 30 and 70 is connected to the air conditioner 2 of the circulation ventilation passage, and the other is connected to an exhaust port 56 opened in the indoor space A. A ventilation system for both cold and hot seasons using the heat collecting duct according to claim 2.   The ventilation system for both hot and cold periods using the heat collection duct according to claim 2 or 3, wherein the heat collection duct (32) is installed at a position higher than the exhaust port (56) in the indoor space.   The air passage 10 communicates with the end portion side of the heat collecting duct 32 and extends in the indoor space A, and has an air supply / exhaust duct 22 having an air supply port 24 and an exhaust port 25, and the heat collection duct 32. It has dampers 26A, 26B... For switching the flow paths between the air supply ports 24 to the exhaust ports 25, and ventilating ports 28 are opened at appropriate positions in the indoor space A. A ventilation system for both cold and hot seasons using the heat collecting duct according to any one of claims 1 to 4.   The heat collecting duct (32) is characterized in that at least an upper wall portion of the heat collecting duct (32) serves as a light transmitting portion (38), and a heat collecting plate (44) having a light receiving surface (46) facing the light transmitting portion is installed in the heat collecting duct. A ventilation system for both cold and hot seasons using the heat collecting duct according to any one of claims 1 to 5. The ventilation system for both hot and cold periods using the heat collection duct according to any one of claims 1 to 6, wherein the heat collection duct 32 is capable of adjusting an inclination angle with respect to a horizontal plane.

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