JP2019174081A - Outside air introduction unit and outside air introduction system - Google Patents

Abstract

To provide an outside air introduction unit in which outside air can be properly adjusted in temperature by a heat exchanger installed in a supply air duct of a 24-hour ventilation system even at a strong wind blowing day to enable the outside air to be taken into an inside area.SOLUTION: An outside air introduction unit 10 comprises a heat exchanger 20 installed in a supply air duct 3 passing through a wall to connect an outside area with an inside area and a supply air port cover 50 attached to an outside inlet of the supply air duct 3, covers said inlet from three directions of front, upper and lower sides to form a ventilation flue 51 passing through at right and left sides. Residual hot water in a bath is circulated at the heat exchanger 20. The outside air introduction unit 10 slightly heats cold outside air in winter season and feeds it into an inside area.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outside air introduction unit and an outside air introduction system for introducing outside air into a room through an air supply duct that penetrates a wall and connects the outside and the inside.

  Modern houses have a 24-hour ventilation system. As shown in FIG. 10, for example, a ventilation fan 101 is provided in the back of a ceiling of a bathroom, for example, and a suction port 102 of the ventilation fan 101 is placed on a ceiling of a toilet, a washroom, a bathroom, etc. The air supply port 103 is provided on the wall of each living room facing the outside, and the exhaust of the ventilation fan 101 is exhausted to the outside through the duct through the exhaust port 104 provided at the entrance or the like. ing. This is a method in which exhaust is performed by a fan and air supply is taken in naturally without using a fan (exhaust type), and is widely used in ordinary houses.

  By the way, in the winter, cold outside air enters the room from the air inlet 103. In the house shown in FIG. 10, a room such as a living room where people have been living for a long time is heated and warm. The warm air slowly flows toward the suction port at the center of the house, and is sucked from the suction port 102 and discharged to the outside. On the other hand, the Western-style room (1), Western-style room (2), etc. are often not heated from the viewpoint of heating cost saving when used in a bedroom or the like. Also, since warm air does not flow from the living room, the room temperature is low. At dawn, toilets get cold. Therefore, for example, if you enter these rooms after taking a bath, or if you go out of the futon at dawn and go to the toilet, you may receive a heat shock.

  There is a method of using the amount of heat of the remaining hot water in the bath as a method of heating to such an extent that the heat expenses can be prevented by suppressing the utility cost. For example, Patent Document 1 discloses a heating system that circulates hot water in a bathtub to a heat exchanger that receives air from a fan.

  However, in this heating system, since the temperature difference between room temperature and the remaining hot water in the bathtub is small, the heat dissipation efficiency is low, and a large heat exchanger is required to obtain the required amount of heat.

JP 2000-283558 A

  As shown in FIG. 11, the applicant of the present application attaches a radiator 110 that circulates the remaining hot water of the bath in the duct of the air inlet 103 of the 24-hour ventilation system, and cools the outdoor cold air through the air inlet 103. Devised an outside air introduction system that heats the air with a radiator 110 when it is taken indoors. As shown in FIG. 12, the radiator 110 is configured by laminating a plurality of flat tubes 113, which are thin and flat pipelines, at predetermined intervals between a water inlet pipe 111 and a water outlet pipe 112.

  Usually, in the 24-hour ventilation system, the air supply amount is set so that the outdoor is appropriate in a windless state. This air supply amount is also assumed in the above-described outside air introduction system. However, when there is wind outdoors, the air supply amount increases, so that appropriate performance cannot be exhibited. That is, although the outside air introduction system is intended to prevent cold air from being taken into the room, in the case of strong wind, the cold wind enters the room before warming to an appropriate temperature.

An air supply port cover 108 is attached to the outdoor side of the air supply port in order to avoid rain. A general air inlet cover has a shape as shown in FIG. 13 and prevents rain and wind from entering from above, obliquely upward, left and right, and from the front, and mainly takes in outside air from below.
However, on a day of snowstorm or strong wind in winter, as shown in FIG. 14, cold wind blows up from the ground along the outer wall, so with this type of air supply cover, the wind blown from the ground is directly applied to the air supply opening. Since it enters and flows into the room, cold wind enters the room before it is warmed by the radiator 111.

  The present invention has been made in view of the above-mentioned problems, and is able to take in outside air by appropriately adjusting the outside air temperature with a heat exchanger arranged in an air supply duct even on a strong wind day. It aims at providing an introduction unit and an outside air introduction system.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1] a heat exchanger installed in an air supply duct that penetrates a wall and connects the outside and the interior;
Before the inlet on the outdoor side of the air supply duct, an air inlet cover that covers the front, upper, and lower sides of the inlet and forms a ventilation passage penetrating left and right;
Comprising
An outside air introduction unit characterized by that.

  In the above invention, the air supply port cover can prevent the wind blown from below from entering the air supply duct as it is.

[2] The outside air introduction unit according to [1], wherein the heat exchanger is arranged at a predetermined distance from the entrance to the indoor side.

  In the above invention, the wind passing through the ventilation path meanders so as to enter the air supply duct to some extent, so the heat exchanger is separated from the inlet on the outdoor side of the air supply duct so as not to hit the wind passing through the air. Deploy.

[3] The heat exchanger includes a plurality of laminated plate-like members that exchange heat with the outside air at intervals, and the plate-like members are arranged along the extending direction of the air supply duct and vertically or obliquely. The outside air introduction unit according to [1] or [2], wherein the outside air introduction unit is installed in the air supply duct in such a direction.

  In the above invention, if the plate member is vertical or oblique to the wind passing through the ventilation path from left to right while meandering slightly into the air supply duct, the wind and the plate member are not parallel and laminated. It becomes difficult for the wind to pass through between the formed plate-like members.

[4] The oblique range is such that the plate-like member is vertical from a first diagonal line connecting the lower right end to the upper left end of the ventilation path, and vertical from a second diagonal line connecting the lower left end of the ventilation path to the upper right end. The outside air introduction unit according to [3], characterized in that

  In the above invention, the angle of the wind passing through the ventilation path is an angle range that is horizontal from the first diagonal line and horizontal from the second diagonal line. Therefore, if the direction of the plate-like member is set to an angle range other than this, it is laminated. It becomes difficult for the wind to pass between the plate-like members.

[5] In the heat exchanger, the plate-shaped member is a hollow flat tube, and adjacent flat tubes are connected in the stacking direction by connecting portions on one end side and the other end side thereof, and are connected to the inflow port. A heat exchanger configured such that the inflowing heat medium fluid flows out from the outlet through each flat tube and the connection,
The outside air introduction unit according to any one of [1] to [4], wherein

  In the said invention, a heat exchanger with high heat exchange efficiency can be produced small by laminating | stacking a flat tube.

[6] An outside air introduction unit according to any one of [1] to [5];
A circulation device for circulating a heat medium fluid in the heat exchanger of the outside air introduction unit;
An outside air introduction system characterized by comprising:

  According to the outside air introduction unit and the outside air introduction system according to the present invention, even on a strong wind day, the outside air can be appropriately adjusted in temperature by the heat exchanger disposed in the air supply duct and taken into the room.

It is a figure which shows the external appearance of the external air introduction unit which concerns on embodiment of this invention. It is a figure which shows the front surface, left side surface, and plane of an air supply port cover. It is a perspective view which shows a heat exchanger unit. It is a figure which shows three types of flat tubes which comprise a heat exchanger. It is a figure which shows the water flow path | route in one reciprocating type heat exchanger. It is a figure which shows the water flow path in a parallel type heat exchanger. It is a figure which shows the airflow which meanders and flows in the ventilation path. It is a figure which shows the example which has arrange | positioned the heat exchanger in an air supply duct so that a flat tube may become vertical. It is a figure which shows the diagonal angle range accept | permitted by a flat tube. It is a figure which shows the structural example of the 24-hour ventilation system installed in the house (apartment). It is a figure which shows the example which installed the heat exchanger in the air supply duct provided with the general air supply port cover. It is a perspective view which shows an example of the heat exchanger provided in an air supply duct. It is a figure which shows a general air inlet cover. It is a figure which shows a mode that a wind blows up along the outer wall of a building from the ground.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows the appearance of an outside air introduction unit 10 according to an embodiment of the present invention. An outside air introduction unit 10 according to the present embodiment is attached to a heat exchange unit 20 that is inserted into an air supply duct 3 that penetrates a wall and connects the outdoors and the indoors, and an inlet on the outdoor side of the air supply duct 3. And an air supply port cover 50 to be configured. The air supply duct 3 is the same as that described in the background art. The air supply port in a 24-hour ventilation system in which exhaust is performed by a fan and the supply air is naturally taken in without using the fan (exhaust type). It is.

  The air inlet cover 50 forms a ventilation path 51 that covers the front, upper, and lower sides of the air inlet duct 3 and penetrates left and right before the air inlet duct 3 on the outdoor side. The air supply port cover 50 of this example is configured to include a cylindrical insertion portion 52 that is closely inserted into the ventilation path 51 and the air supply duct 3.

  FIG. 2 shows the front, left side, and plane of the air supply port cover 50. The right side has the same shape as the left side, and the bottom has the same shape as the plane. The ventilation path 51 of the air inlet cover 50 has a cylindrical shape in which the left and right wall surfaces are removed from a hollow rectangular parallelepiped having a left and right width w and height h of about 15 cm and a front and rear depth d of about 4 cm.

  A circular opening 53 corresponding to the inlet of the air supply duct 3 is provided on the back wall surface, and a cylindrical insertion portion 52 is provided so as to protrude from the opening to the back.

  The air supply port cover 50 is fixed to the wall surface of the building with a screw (not shown) in a state where the insertion portion 52 is inserted into the air supply duct 3 and the ventilation path 51 is oriented to be a horizontal passage.

  As shown in FIG. 1, the heat exchange unit 20 is disposed at a position away from the outdoor side entrance of the air supply duct 3 to the indoor side by a predetermined distance. In this example, the heat exchange unit 20 is arranged at a position about 5 cm away from the outdoor entrance of the air supply duct 3.

  FIG. 3 is a perspective view showing the heat exchange unit 20. The heat exchange unit 20 includes a heat exchanger 21 through which a heat medium fluid such as hot water is passed, and a partition plate 22 that closes a gap between the outer edge of the heat exchanger 21 and the inner wall of the air supply duct 3. The heat medium fluid to be circulated in the heat exchanger 21 of the heat exchange unit 20 is bathtub water remaining in the bathtub, warm water flowing through the floor heating mat, or the like. The circulation device that plays the role of circulating the bathtub water or hot water via the heat exchanger 21 of the heat exchange unit 20 uses a bath water heater, a gas hot water heater or another pump unit, or the like. The present invention may be an outside air introduction system including the heat exchange unit 20 and a circulation device that circulates the heat medium fluid therethrough.

  The heat exchanger 21 of the heat exchange unit 20 has a structure in which a plurality of flat tubes 23 are stacked at intervals. Each flat tube 23 has a thin flat plate shape with a hollow inside and a rectangle (here, approximately square). Here, the height of the internal cavity (water channel) of each flat tube 23 is 0.6 mm, the thickness (plate thickness) of the wall surface constituting the internal cavity is 0.2 mm, and the interval between the stacked flat tubes 23 is 2.2. mm.

  The heat exchanger 21 includes a heat medium fluid inlet 25 and an outlet 26, and the heat medium fluid flowing into the inlet 25 flows out of the outlet 26 through the stacked flat tubes 23.

The structure of the heat exchanger 21 will be described in more detail.
Each rectangular flat tube 23 includes connection portions 24 at two corners located on one of the diagonal lines, and the flat tubes 23 adjacent in the stacking direction are connected to each other by the connection portion 24. The connecting portion 24 has a short cylindrical shape protruding from the wall surface of the flat tube 23 to a height of about one-half of the stacking interval, and the wall surface (one of the front and back sides of the flat tube 23 at a position where the connecting portion 24 is located). On both sides, a hole leading to the cylindrical connecting portion 24 is opened.

  As shown in FIG. 4, in the present embodiment, the flat tube 23 is diagonally formed with a through-type flat tube 23 a in which holes are formed in the front and back wall surfaces of both of the two connecting portions 24 on the diagonal line. A hole is formed in the wall surface on the back side in both of the two connection portions 24, and the surface wall surface is diagonally opposite to the one-surface flat tube 23b in which a hole is opened in a position corresponding only to the connection portion 24 on one side. There are three types of one-sided flat tubes 23c in which holes are formed in the front wall surface in both of the two connection portions 24, and the holes on the back wall surface are opened in positions corresponding to only one connection portion 24, By combining these, the heat exchanger 21 of various water flow paths is configured.

  For example, as shown in FIG. 5, from the top, a single surface flat tube 23b × 1, a through flat tube 23a × 2, a single back flat tube 23c × 1, a single surface flat tube 23b × 1, a through flat When the tubes 23a × 2 and the single-sided flat tube 23c × 1 are stacked, a reciprocating heat exchanger in which a heat medium fluid flows is configured as indicated by a broken line in the figure. When the number of the flat tubes 23 is large, a two-reciprocating type, a three-reciprocating type, etc. can be used. In the case of the reciprocating type, the inlet 25 and the outlet 26 are formed on the same connecting portion side.

  On the other hand, as shown in FIG. 6, it is possible to configure a parallel heat exchanger 21 in which the heat medium fluid flows in the same direction in all the flat tubes 23. In this example, a single surface flat tube 23b × 1, a penetrating flat tube 23a × 5, and a single back flat tube 23c × 1 are stacked from the top. In the case of the parallel type, the inflow port 25 is formed in one connection portion 24, and the outflow port 26 is formed in the other connection portion 24. Configurations such as outbound, inbound and outbound are possible.

  By connecting the flat tubes 23, the connecting portions 24 of the adjacent flat tubes 23 are connected and connected. If the connection parts 24 with holes in the wall surfaces are connected to each other, the flat tubes 23 adjacent to each other at the place communicate with each other via the connection part 24.

  The partition plate 22 is arranged so as to be orthogonal to each flat tube 23 and to face an oblique direction with respect to the extending direction of the air supply duct 3. Here, the two corners where the connecting portions 24 are arranged are connected to each other along a diagonal that is different from the diagonal (see FIG. 3).

  A rectangular opening is formed in the partition plate 22, and the heat exchanger 21 is accommodated therein.

  The passage area of the air supply duct 3 is smallest at the opening portion of the partition plate 22. When the partition plate 22 is provided orthogonal to the extending direction of the air supply duct 3, if the air supply duct 3 is circular in cross section, the rectangular opening of the maximum size that can be formed in the partition plate 22 is square. . On the other hand, when the partition plate 22 is disposed obliquely with respect to the extending direction of the air supply duct 3, the outer shape of the partition plate 22 becomes an elliptical shape, so that the maximum size that can be formed in the elliptical partition plate 22 is obtained. The rectangular opening is rectangular, and the opening area is larger than the square opening described above. As a result, the airflow resistance when the air flow in the air supply duct 3 passes through the heat exchanger 21 can be kept small.

  Next, the operation of the air supply cover 50 will be described.

  The air supply port cover 50 forms a cylindrical ventilation path 51 that covers the front, upper, and lower portions of the inlet of the air supply duct 3 and penetrates left and right. As shown in FIG. 3, even when a cold wind blows up from the ground along the outer wall, the blown-up wind can be prevented from flowing into the room through the air supply duct 3 as it is.

  By the way, since there is an opening 53 leading to the air supply duct 3 in the middle of the ventilation path 51 and air is drawn indoors by the 24-hour ventilation system, the air flow through the ventilation path 51 is as shown in FIG. As shown in FIG. 2, the meandering is performed so as to be drawn into the air supply duct 3.

  If the heat exchanger 21 of the heat exchange unit 20 exists in a range where the air flow passing through the ventilation path 51 meanders, the air flow takes heat from the heat exchanger 21 and discards the heat to the outdoors. Therefore, the heat exchanger 21 of the heat exchange unit 20 is arranged away from the outdoor side entrance of the air supply duct 3 to the indoor side so as not to enter the range in which the air flow meanders. For example, it is good to separate more than half of the diameter of the opening 53. In this example, the distance is preferably about 5 cm or more.

  In order to prevent the meandering air flow from flowing between the flat tube 23 and the flat tube 23 in which the heat exchanger 21 is laminated, the flat tube 23 is made to be vertical as shown in FIG. It is desirable to arrange the heat exchanger 21 in the air supply duct 3.

  Note that, in addition to the orientation in which the flat tube 23 is vertical, even if the flat tube 23 is disposed so as to be inclined in a predetermined angle range, the same effect as in the case where the flat tube 23 is vertical can be obtained. Specifically, as shown in FIG. 9, the allowable oblique angle range 61 is such that the flat tube 23 is vertically longer than the first diagonal line 62 connecting the lower right end to the upper left end of the air passage 51, and the air passage 51. It is the range which becomes vertical from the 2nd diagonal line 63 which connects an upper right end from the lower left end of No .. Within the angle range 61, it is possible to prevent the air flow meandering through the ventilation path 51 from entering between the flat tubes 23. Thereby, the distance which leaves | separates the heat exchanger 21 from the inlet_port | entrance on the outdoor side of the air supply duct 3 can be shortened.

  Next, a heating operation and the like performed by the outside air introduction system according to the present invention will be described.

<Bath water heating operation>
The bath water heating operation is an operation in which the bath water remaining in the bathtub after the completion of the automatic bath operation is circulated through the heat exchange unit 20 for heating. For example, in the bath reheating circuit, a three-way valve is provided in the middle of the bath outlet pipe where the hot water sent out by the bath pump goes to the bathtub, and the hot water sent out by the bath pump goes directly to the bathtub and the bath The hot water sent out by the pump passes through the heat exchanger unit 20 and then switches to the second path toward the bathtub. When bath water is heated in a plurality of rooms by passing bath water through the plurality of heat exchange units 20, the plurality of heat exchange units 20 may be connected in parallel.

  In the bath water heating operation, the bath pump is driven by switching the three-way valve so that the second path is formed. Thereby, the hot water in a bathtub is taken in from the bath water intake, passes through the heat exchanger unit 20, and then flows and circulates back from the bath water outlet to the bathtub.

  Due to the action of the 24-hour ventilation system, the outside air is always taken into the room through the air supply duct 3, so that the outdoor air is warmed by the heat exchange unit 20 attached to the air supply duct 3 during the bath water heating. It is captured.

  For example, a heating capacity of about 200 W (400 W for two) can be obtained from 10 o'clock in the evening after bathing until about 5 o'clock at dawn, which can contribute to prevention of heat shock.

<Tub water cooling operation>
In summer, simple cooling can be performed using the heat exchange unit 20. That is, tap water (for example, 15 ° C.) is filled in the bathtub, and this is circulated to the heat exchange unit 20 in the same manner as the bath water heating operation. For example, when water (15 ° C.) is put in a bathtub in the morning in summer, and then a cooling operation using the heat exchange unit 20 is performed, the bath water rises to about 25 ° C. in the evening. In this way, not only can the cooling effect be obtained, but the amount of heat required to boil the bath by chasing can be reduced, contributing to energy saving.

  When the heat exchange unit 20 is used for cooling operation, as shown in FIG. 8, the heat exchangers 21 are arranged so that the flat tubes 23 are vertically oriented, and a drain receiver is provided below the heat exchangers 21. It is good to do so. The drain is drained to the outdoors.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  In the embodiment, an example in which the ventilation path 51 of the air supply cover 50 is a square when viewed from the front is shown, but in order to more reliably prevent rain blowing from the left and right openings from entering the air supply duct 3. It is good also as a rectangle long on either side. The left and right openings may be part of the left and right wall surfaces. For example, rain can be prevented from entering by closing upper portions of the left and right wall surfaces.

  In addition, the ventilation path 51 is not limited to a cylindrical shape with a rectangular cross section, and for example, the cross section may be a semicircular shape, and the shape may be arbitrary. Furthermore, the ventilation path 51 is not limited to the one in which the left and right openings are directed sideways, and may be directed obliquely downward or upward as long as it is to some extent. For example, the ventilation path 51 may have a cylindrical shape inclined slightly downward from the center toward the left and right ends. The ventilation path 51 may have a cylindrical shape slightly inclined upward from the center toward the left and right ends. When tilting upward, a hole or hose with a small drainage should be attached at the bottom. The ventilation path 51 may have a cylindrical shape having openings at the left end and the right end so that the air can flow from one opening to the other opening.

  The heat exchanger to be inserted into the air supply duct 3 preferably has the structure and shape shown in the embodiment, but is not limited thereto and may be arbitrary. The structure shown in FIG. 12 may be used. A fin-tube type heat exchanger that does not use a flat tube may be used.

DESCRIPTION OF SYMBOLS 3 ... Air supply duct 10 ... Outside air introduction unit 20 ... Heat exchange unit 21 ... Heat exchanger 22 ... Partition plate 23 ... Flat tube 23a ... Through-type flat tube 23b ... Single-sided flat tube 23c ... Single surface type flat tube 24 ... Connection part 25 ... Inlet 26 ... Outlet 50 ... Air supply cover 51 ... Ventilation path 52 ... Insertion part 53 ... Opening part 61 ... Permissible angle range 62 ... First diagonal 63 ... Second diagonal

Claims (6)

A heat exchanger installed in an air supply duct that penetrates the wall and connects the outside and the inside;
Before the inlet on the outdoor side of the air supply duct, an air inlet cover that covers the front, upper, and lower sides of the inlet and forms a ventilation passage penetrating left and right;
Comprising
An outside air introduction unit characterized by that. The outside air introduction unit according to claim 1, wherein the heat exchanger is disposed at a predetermined distance from the entrance to the indoor side. The heat exchanger includes a plurality of plate-shaped members that exchange heat with the outside air and are stacked at intervals, and the plate-shaped members are oriented along the extending direction of the air supply duct and vertically or obliquely. It is installed in the said air supply duct. The external air introduction unit of Claim 1 or 2 characterized by the above-mentioned. The oblique range is a range in which the plate-like member is vertical from the first diagonal line connecting the lower right end to the upper left end of the ventilation path and vertical from the second diagonal line connecting the lower left end of the ventilation path to the upper right end. The outside air introduction unit according to claim 3, wherein In the heat exchanger, the plate-shaped member is a hollow flat tube, and adjacent flat tubes are connected in the stacking direction by connecting portions on one end side and the other end side, respectively, and heat flowing into the inflow port A heat exchanger configured to allow medium fluid to flow out of the outlet through each flat tube and connection,
The outside air introduction unit according to any one of claims 1 to 4, wherein the outside air introduction unit is provided. An outside air introduction unit according to any one of claims 1 to 5,
A circulation device for circulating a heat medium fluid in the heat exchanger of the outside air introduction unit;
An outside air introduction system characterized by comprising: