JP2011043288A - Heat recovery device using hollow panel and method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light and inexpensive heat recovery panel having strong physical strength and strong resistance to rust. <P>SOLUTION: In this heat recovery device using a hollow panel, the hollow panel having a support column wall face extended to one direction to provide a space between two upper and lower plate-shaped bodies (a direction in which cavities are continued is defined as a y-axis and a direction intersecting at a right angle with the y-axis and a perpendicular of panel upper and lower faces is defined as an x-axis) is cut so that the x-axis direction is wide, the y-axis direction is narrow, two or more parts on the upper and lower sides have the same width, and right and left support column wall faces of upper and lower cut parts are identical to each other. Upper and lower ends of the panel which are originally opened face are closed. Plate-shaped bodies covering the respective cut parts are attached to upper and lower two parts from both surface and back face, and two or more openings 9, 10 for taking in/out fluid are provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention performs heat recovery from the environment such as solar heat, geothermal heat, river water, cold heat recovery, air conditioner compressors, cooking, lighting fixtures and other equipment, machine-derived temperature, cold heat recovery, and further heat recovery and adjustment of human bodies, livestock, etc. The present invention relates to a simple method for making a heat exchanger with a heat recovery device and a commercially available hollow panel that can be made lightweight, inexpensive, and highly workable.

Conventionally, when recovering solar heat or the like, solar water heaters, solar air heaters and the like have been mainstream. Solar water heaters have a considerable weight even if they are not equipped with a tank, and the load on the building is regarded as a problem. Of course, it was impossible to attach to the wall or veranda in terms of weight. Moreover, it was not something that could be freely carried.

Japanese Patent Publication No. 2009-16475 is a heat recovery device for heat generation countermeasures for solar panels, but does not perform heat recovery using a fluid as in the present invention.

Japanese Patent Publication No. 2008-267618 has a structure in which a pipe is stretched around a resin plate, and the structure is complicated and has not been put into practical use at high cost.

Japanese Patent Publication No. 2007-107288 performs heat recovery around the tunnel wall surface, but the panel has a structure in which the middle part is embedded in the concrete, and its weight is distinct from the present invention including its weight. is there.

Japanese Patent Publication No. 2000-74403 has a panel structure as a whole, but its configuration is complicated and supply at low cost is difficult.
Patent Publication 2009-16475 Patent Publication 2008-267618 Patent Publication 2007-107288 Patent Publication 2000-74403

The present invention recovers heat and cold from the environment such as solar heat, geothermal and river water, as well as heat and cold recovery from machines and equipment such as air conditioner compressors, cooking and lighting equipment, and further, biological heat from human bodies, livestock, etc. Providing a heat recovery unit that is lightweight and has excellent physical strength, durability, and workability in a wide range of applications, and a production method that makes it possible to use an inexpensive hollow panel that can be obtained in a familiar manner as a heat recovery unit. The purpose is to provide.

Various hollow panels such as a to e in FIG. 1 (the direction in which an elongated cavity surrounded by a column wall 3 that is continuous on both sides of the hollow panel is defined as the y-axis, and the y-axis and the direction perpendicular to the vertical axis of the panel. 2 is wide in the x-axis direction and narrow in the y-axis direction as shown in FIG. 2, and the left and right strut wall surfaces 3 of the upper and lower cutouts are the same width at the upper and lower two places in the figure. Cut out to be the same.

The upper and lower ends of the panel, which is the original opening surface, are closed and sealed with aluminum tape, silicone material or the like as shown in FIGS.

As shown in FIG. 4, two upper and lower plate-like bodies 8 having a size capable of covering the cut portions from both the front and back surfaces of the panel are provided at the upper and lower cut portions, and at least two or more openings are provided for taking in and out the fluid. The plate-shaped body should just be the size which covers the cut-out part. In this way, the portion where the panel is removed by cutting out constitutes a space surrounded by the upper and lower opening surfaces, the left and right support wall surfaces, and the front and back plate-like bodies.

As shown in FIGS. 9 and 10, the opening (small hole) for taking in and out of the fluid is in the plate-like body, and when the plate-like body is pasted to the cut-out portion, the opening comes to be on the cut-out portion. .

When the fluid is gas, one of the openings is in a plate-like body, and the other (one or more may be many) is on the panel surface or the hollow panel opening surface (in this case, any of 7, 12, 13) It may be born by removing the sealing process.)

In order to further improve confidentiality, the outer opening surfaces of the upper and lower cut portions that are no longer cut off from the hollow panel are sealed with aluminum tape, silicone material, or the like as shown at 12 and 13 in FIG. When sealing this part, it is preferable to inject a silicone caulking material or the like directly into the panel cavity near both ends in order to eliminate leakage from both ends of the tape. As shown in FIG. 4, two upper and lower plate-like bodies that are large enough to block the upper and lower cut portions from both sides of the panel are stretched.

The plate-like body is sized to cover the cut-out portion, and the material may be metal, resin, or the hollow panel. In addition, a plate-like body without an opening is efficient because it can use the surface of the heat recovery target itself if it is used by bonding a plurality of panels with silicone caulking material or the like. For example, j in FIG. 8 is 17 heat insulation panels, i in FIG. 8 is a flat surface on the back side of 19 solar panels, and m in FIG. 8 is an outer wall surface of a compressor or the like.

In this way, a structure is formed in which a fluid can flow through the elongated cavity of the hollow panel. A pipe body 14 or the like is attached to the opening, and a pump or a fan is driven to take in or out a gas or fluid to recover heat around the panel surface.

By using a polycarbonate hollow panel (transparent, translucent, colored), unlike a conventional metal heat recovery device, it is possible to provide a heat recovery device that is lightweight, resistant to rust, and easy to process.

In general, commercially available hollow panels that are used as building materials such as walls and roofing materials can easily recover and reuse solar heat and other low-temperature living (industrial) waste heat.

Made of polycarbonate with a tatami size (1820 x 910 x 4.5 mm) with a hollow harmonica structure as shown in Fig. 1a, which is widely used as simple roofing materials and simple wall materials (partitions, etc.) for warehouses and garages. (Polyethylene may be used.) Prepare a panel (in this case, brown is used, but it can be arbitrarily selected from black to transparent, which does not transmit light, to transparent), and the lower left is (0, 0) as shown in FIG. A horizontal rectangle of 750 × 40 mm with the center of the figure at (455, 100) and (455, 1720) is cut with a cutter or the like.

Next, the opening surface 4 which is the upper and lower sides of the original panel is closed with a butyl rubber-based aluminum tape and silicone caulking material (this panel angle may be used only for the panel) as shown in FIG. Seal.

When heat recovery is performed through a gas such as air, this is sufficient. However, when water (or a liquid containing antifreeze liquid) is used as the heat recovery medium, an opening surface close to the outside of the cut-out portion as shown in FIGS. Close as above. At this time, silicone caulking material is directly flowed from the corner into several panel cavities using a gun.

Next, the hollow panel cut-out portion is sandwiched from both the front and back sides of the panel with an alcohol-based silicone material so as to fit in the dotted line position 11 in FIG. 4 and the outer cut-out portion is sealed. The size of the polycarbonate plate is about 850 × 140 mm for convenience, as long as the adhesive surface is sufficiently removed, and the thickness is about 1 mm to 2 mm.

Two or more openings (holes for taking in and out the fluid) are provided at positions where the whole or part of the cut-out portion is exposed at an arbitrary place on the plate-like body, which is used as a fluid inlet / outlet. 9 and the lower opening 10 are arranged on the same diagonal line.

It is self-evident that the fluid cannot be taken in and out between the opening and the opening surface of the cut-out portion (the inner side not sealed) unless the opening opened in the plate-like body comes on the cut-out portion. In the case where the small hole group 21 provided on the front and back surfaces of the panel (either one or both sides) as shown in 21 of FIG. There may be only one opening on the body.

The position of the opening depends on the horizontal relationship when the panel is installed, that is, the horizontal, vertical and horizontal installation of the panel, but the basic principle is the position where the fluid introduced from the inlet is first-in first-out on the outlet side.

As an example, in the case of the position shown in FIG. 4, when fluid (water or the like) is introduced from the lower opening 10, the fluid fills the lower cutout space and rises in parallel in the continuous hollow portions of the hollow panels arranged vertically. The cutout space is filled and discharged from the upper opening 9. The fluid recovers ambient heat at the path surface during this time.

FIG. 10 relates to control of the flow of fluid. The fluid that has entered the cavity of the cut-out portion from the fluid inlet 29 (the continuous space surrounded by the support wall and the upper and lower surfaces by the hollow panel) is separated by the partition wall 31 (the partition between the front and back surfaces and the upper and lower opening surfaces of the cut-out portion, It cannot go directly to the fluid outlet 30 due to the sealing of the front and back surfaces, moves down the cavity portion partitioned by the column wall and the front and back surfaces of the panel, and then hits the next partition wall and rises again. In this way, the surrounding heat is recovered on the panel surface while moving over time while repeating meandering. This is because the partition sealing unit 32 does not make water in the cavity sandwiched between the pillar walls when the partition body has a width in the x direction.

The heat recovery of the fluid is performed exclusively in a space sandwiched between the upper and lower cut-out portions (a collection surface of a number of elongated cavities surrounded by the upper and lower surfaces of the hollow panel and the wall surface of the column). In the case of heat recovery, peripheral energy (including light) transmitted from the outside to the panel causes thermal vibration of the panel constituent material, and the vibration is transmitted to the fluid inside the panel. In the case of cold energy recovery, the reverse vibration is passed.

When liquid such as water is used as the fluid, water drainage is performed through a hose (or a PVC pipe) by combining a faucet joint and a valve socket, which can be easily obtained as a water supply part, in the opening. When attaching the valve socket to the plate-shaped body, the thickness of the cut-out part is only 4.5mm, so if it comes inside (the opposite shape fastener), etc., it is necessary to process it as thin as possible so as not to increase the fluid resistance is there.

Depending on the panel installation method (horizontal, vertical or horizontal), the valve socket can be mounted in a variety of patterns, but the liquid fills the sealed compartment in the panel, and the new liquid is introduced first. It is set as a position where the emptied liquid is sequentially pushed out and a cavity not filled with water is not formed.

In order to keep the liquid inside the panel for a certain period of time, it is necessary to install a check valve on the liquid inlet side to stop the backflow of the liquid by the siphon.

When air is used as the fluid, an opening duct pipe (or a vertical doi pipe may be used instead) is provided, and air movement in the heat recovery panel is performed by suction or ventilation. The air blowing means may be on the path connected to the opening or directly on the plate-like body opening.

FIG. 6 is a structural view and a cross-sectional view of a heat recovery panel according to the present invention. As shown in the longitudinal sectional view f, the upper and lower two cut-out portions are sealed with polycarbonate plates from both sides, and are on the plate-like body, and the opening with one pipe portion at each of the upper and lower portions is formed on the cut-out portion. Yes (here, the upper and lower pipe bodies are positioned on the center line for the sake of simplicity). As shown by the fluid flow 16, the fluid entering from the lower opening enters the holding space 15 and has a planar spread from the pipe body in the upper cutout plate body. Discharged. The fluid exclusively exchanges heat with the surroundings at 15.

In FIG. 7, another hollow panel is stretched on one side of FIG. When the upper and lower opening surfaces of the heat insulation panel are simply closed and sealed with aluminum tape or the like, the energy loss used for thermal expansion in the heat insulation panel cavity is suppressed, and heat is generated accordingly. In addition to the above, the thermal insulation panel for collecting sunlight and the like may be a bubble wrap sheet for packing, a vinyl sheet, or the like. If solar heat recovery is performed in conjunction with the roof material, a polycarbonate roof corrugated sheet can be used as the outer material. By using such a separate heat retaining and reinforcing material, the life of the heat recovery panel itself can be extended.

FIG. 8j shows a solar water heater or a solar water heater of the present invention in which a heat insulation panel is stretched on the sunlight receiving surface side of the basic heat recovery panel of FIG. 6 and a heat insulating panel 18 is stretched on the opposite side to allow liquid or air to pass through. The usage is shown.

K in FIG. 8 is a utilization method of the present invention in which the two basic heat recovery panels of FIG. 6 are in close contact, and heat exchange (recovery) is performed at the joint surfaces of both panels. The installation positions of the pipes used for fluid entry / exit may be in opposite directions, or they may be attached in the same direction by shifting the panels up and down or left and right, or by passing the other panel pipe through part of one panel surface. It is also possible to withdraw.
As a precaution when penetrating, a sealing process between the panel of the penetrating portion and the pipe is necessary.

In FIG. 8 l, the heat recovery panel of the present invention is spread on the back surface of the solar panel 19 (opposite the light receiving surface), and fluid (water, antifreeze liquid, etc.) is supplied to heat the light energy that has not been converted into electricity from the solar panel. As a method of using the present invention for efficient recovery. The heat recovery here is also an effective means for avoiding a decrease in power generation efficiency due to a rise in the temperature of the solar panel.

FIG. 8m shows an embodiment of the present invention in which the heat of the heating element 20 such as a compressor (refrigerator, air conditioner, etc.) is recovered from the outer case. Such low-temperature waste heat rises enormously and is an effective means for reducing CO2. Moreover, if it is a vaporizer, cold heat can also be collect | recovered.

In FIG. 8 n, a large number of small hole groups 21 are provided on the hollow panel, the left and right opening surfaces of the hollow panel are sealed with aluminum tape or the like, one cut-out portion is provided, and the plate-like body is stretched on both the front and back surfaces. Seal and seal it with an air suction means. Such a hollow panel is pulled under a bed, a futon or the like and sucked by the suction means, thereby becoming a means for collecting night sweats and lowering body temperature in summer. In winter, warm air can be blown from the opening. The heat used here can be supplied from, for example, another heat exchange panel attached to the outer surface of the refrigerator, which is an energy saving method by adjusting the heat balance in the room.

8 in FIG. 8 is an embodiment that takes advantage of the flexible material characteristics of a hollow panel made of polycarbonate resin. As shown in the figure, it can be used as a dome-shaped bending house. Daylight sunlight can be warmed with a fluid in the panel (water, etc.) and stored in a heat insulation tank, and used for heating at night. In the case of water, since the heat capacity is large, the temperature fluctuation is small compared to a normal house, and it is suitable for cultivation of plants that prefer such an environment. Of course, this panel can be used in the house without bending.

Except for the temperature problem, in the field of agricultural use, it is possible to adjust the light supply suitable for the cultivar by using a highly transparent panel material and changing the color of the liquid fed to the panel. Moreover, according to recent research, reports that not only the amount of light but also the wavelength (spectrum) of light affect plant growth are becoming known. In such a panel, not only heat recovery but also a dyed fluid (both liquid and gas) can be passed through the panel space, and the degree of growth can be investigated to efficiently control both temperature and light wavelength factors. It becomes.

Also, when the sun is too strong in the daytime etc. in the house, etc., the temperature rise inside the house is suppressed by using a light shielding sheet etc., but in the present invention, a fluid with a pigment with strong light shielding properties is introduced with a pump etc. It is possible to easily suppress solar radiation. It is also possible to use, for the panel fluid, a solution whose light transmittance and absorption amount change depending on the solar radiation intensity and temperature. In plant factories, how to dissipate heat from lighting in summer is a problem. In the present invention, a heat recovery panel that allows water (or a liquid that absorbs a specific wavelength) to pass between the lighting fixture for cultivation and the plant can be installed, and the wavelength that is not used as illumination heat can be easily removed.

The basic size of the hollow panel delivered to the factory is 4000 × 4000 × 4.5 mm. When this size is bent on the dome for o in Fig. 8, one person can lie down in the dome space and can be used as a tent with solar hot water function in the event of a disaster in combination with the heat retaining tank. It is.

It can be used as a heat exchanger with the soil environment as indicated by 23 in FIG. Similarly, it can be used for heat exchange with rivers, lakes and water tanks.

P in FIG. 8 is a laminate of two heat recovery panels of the present invention and a heat insulating material on one of them. The panel 22 on the right side of the figure is a ventilation panel for taking in and out air, and the middle is for taking in and out liquid such as water. The left side is a heat insulation panel with a hole for taking out the liquid pipe body. When such a combination panel is exposed to sunlight on the ventilation panel 22 side, it can be used as a solar hot air heater that collects both hot air and hot water.

When the ventilation panel side of the composite panel laminated with such a combination is installed facing the sun (light receiving side), the air inside the ventilation panel with a small specific heat is immediately warmed up, and heat recovery with warm air during the day can be achieved. Water with a large specific heat in the heat recovery panel in the middle is gradually warmed and functions as a heat accumulator, and heat utilization (bath, heating, etc.) after sunset becomes possible.

When a temperature sensor is attached to the heat recovery panel and the temperature reaches a certain temperature during the day, it is possible to store hot water more efficiently by driving the pump and moving it to another tank having a heat retaining function.

FIG. 9 shows how the heat recovery panel of the present invention is used in a general house. Naturally, a thermal environment different from summer and winter is required, but in order to obtain summer coolness, the underground heat recovery panel 23 is embedded in the ground. From this panel, two pipes for taking in and out the fluid are connected to the heat recovery panel 26 installed on the ceiling surface and circulated by the pump 24. Since the underground temperature is about 17-18 ° C. throughout the year, efficient heat recovery can be performed by attaching a temperature sensor to 23 and driving the pump.

Of course, it is possible to introduce a mechanism for driving the pump when the difference between the liquid temperature of the underground heat recovery panel and the liquid temperature of the heat recovery panel attached to the ceiling exceeds a certain level.

By utilizing the fact that the ground is warm compared to the outside air in winter, 23 warmed fluids can be joined to the heat recovery panel 28 under the floor.

There is a method of circulating hot water produced by the roof surface installation heat recovery panel 27 between the floor bottom installation heat recovery panel. Again, the temperature sensor can be associated with a pump to increase efficiency.

The hot water produced according to the form of the previous paragraph can be used for baths, showers, etc. regardless of summer or winter. In that case, water absorption means and a heat-retaining tank are required, but it can be implemented without difficulty using existing technology.

FIG. 10 illustrates a method for managing the fluid moving in the heat recovery panel. The fluid sent from the fluid inlet 29 enters a space obtained by multiplying the heights between the plate states of the cut-out portion and the front and back surfaces, but the original column wall surface 3, the upper cut-out opening surface sealing processing portion 12, and the partition wall 31. The fluid entering from the fluid inlet 29 of the upper cut-out portion in the drawing falls down the holding space 15 without moving laterally from the partition wall sealing processing portion 32. Next, the fluid that has entered the lower cut-out portion rises again in the panel by the front and back plate-like bodies, the column wall surfaces, and the lower cut-out opening surface sealing processing portion (in this case, sufficient water pressure is applied to rise). . The upper and lower meanders are performed once again and discharged from the fluid outlet 30.

In this way, it is possible to meander the fluid flow inside the panel a plurality of times. The passing distance, time, fluid amount, etc. can be adjusted by the number of times of meandering. Furthermore, the installation position of the inflow and outflow pipes can be freely determined.

Further, by meandering in this way, the pressure of the fluid is dispersed and the leakage becomes difficult.

FIG. 11 shows a state in which FIG. 10 is installed horizontally. The fluid (exclusively liquid) entered from the fluid inlet 29 at the lower left in the figure moves to the right in the fluid movement / holding space 15 and hits the partition wall 30 placed vertically but entering the cutout space on the right side. Thereafter, the entire fluid surface rises, gets over the uppermost part of the partition wall, and flows out from the fluid outlet. By controlling the flow of the fluid by such a method, the fluid inlet and the fluid outlet can be matched to the situation at the site.

The panel side surface opens as much as the width and thickness of the hollow panel as shown in FIG. 12, and the rectangular parallelepiped cover 33 having an opening is covered to an appropriate depth (not covering the fluid inlet / outlet). And the front and back surfaces and the left and right sides of the panel) can be sealed with silicone or the like to implement a heat recovery device.

The fluid flow management method in the rectangular parallelepiped cover method described above is the same as that shown in FIGS. 10 and 11, but the position of the partition wall is inside the rectangular parallelepiped cover.

The present invention uses solar heat in general homes and other buildings, recovery of heat and cold from machinery and equipment, improvement of thermal environment and adjustment of light wavelength in the agricultural field, recovery of light-derived heat in plant factories, It has applicability in all fields related to heat, such as inexpensive heat supply means in the industrial field.

Conceptual diagram showing examples of hollow panel shapes that can be used in heat recovery panels Conceptual diagram showing the cut-out part of the heat exchange panel Conceptual diagram showing the state of sealing treatment of the opening surface of the heat recovery panel Production concept diagram showing the situation where the plate is stuck to both sides of the heat recovery panel cutout Conceptual diagram showing the state of sealing treatment of the opening surface of the heat recovery panel cutout Structure and sectional view of heat recovery panel Structural view and cross-sectional view of heat recovery panel with thermal insulation panel stretched on one side Conceptual diagram showing an example of using a heat recovery panel Conceptual diagram showing an example of use of a heat recovery panel in a building Conceptual diagram illustrating a method for managing a fluid moving in a heat recovery panel Conceptual diagram explaining the management method of fluid moving in the heat recovery panel in horizontal installation Heat recovery panel plan view using a rectangular parallelepiped cover

・ Hollow panel surface ・ Hollow panel back surface ・ Wall of support column ・ Opening surface ・ Upper cutout part ・ Lower cutout part ・ Opening surface sealing processing part ・ Plate-like body ・ Upper opening ・ Lower opening Surface sealing section ・ Lower cut-out opening surface sealing section ・ Pipe body ・ Fluid movement, holding space ・ Fluid flow ・ Thermal insulation panel ・ Thermal insulation panel ・ Solar panel ・ Thermal generator (or cold generator)
・ Small hole group ・ Ventilation panel ・ Underground heat recovery panel ・ Pump ・ Piping ・ Ceiling heat recovery panel ・ Roof surface installation heat recovery panel ・ Lower floor installation heat recovery panel ・ Fluid inlet ・ Fluid outlet ・ Bulkhead ・ Bulkhead Sealing processing part ・ Cuboid cover
a: Conceptual diagram of a panel with a harmonica cut opening
b: Schematic diagram of a panel with a cutting opening with a structure in which diagonal struts are added to a harmonica structure
c: Panel conceptual diagram with a cutting opening with a structure in which the struts crossing from both directions are added to the harmonica structure.
d ： Conceptual diagram of a panel with a cut opening on the slanted column surface
e: Panel conceptual diagram with a cut-off opening on the wave support post surface
f: Fig. 6 aa 'sectional view of the heat recovery panel
g: Fig. 6 bb 'cross-sectional view of the heat recovery panel
h: Fig. 7 aa 'cross-sectional view of a heat recovery panel equipped with a heat insulation panel
i: Fig. 7 bb 'cross-sectional view of a heat recovery panel equipped with a heat insulation panel
j: Heat recovery device as a solar water heater with a structure in which insulation, heat recovery panel, and heat insulation panel are stacked from the left
k: Heat recovery unit with two heat recovery panels
l: Heat recovery panel for solar cell cooling with a heat recovery device attached to the back of the solar panel
m: Use of heat recovery panel attached to the outer surface of the heat generator (or cold generator)
n: Heat recovery panel with small holes on the fluid suction side (or discharge side)
o: Heat recovery panel that can be used in dome-shaped bent houses
p: From the left, solar hot air with heat insulation panel, fluid panel, ventilation panel, heat recovery panel as water heater

Claims (3)

A hollow panel such as a to e in FIG. 1 having a column wall extending in one direction between two upper and lower plates (the direction in which the cavities continue is the y axis, and the y axis is perpendicular to the vertical line of the upper and lower surfaces of the panel. As shown in FIG. 2, the crossing direction is x-axis wide, the y-axis direction is narrow, the top and bottom two or more places are the same width, and the left and right strut wall surfaces 3 of the top and bottom cut-out portions are the same. The upper and lower ends of FIG. 2 that are the original opening surfaces are closed as shown in FIG. 3, and the plate-like body 8 that covers each cut portion is tightly sealed from both the upper and lower sides, both front and back, as shown in FIG. A heat recovery unit using a hollow panel characterized in that two or more openings are provided in any of the above locations and fluid is taken in and out. The hollow panel as shown in FIGS. 1a to 1e (the direction in which the cavities continue is the y-axis, and the direction where the y-axis and the perpendicular to the vertical line of the panel are perpendicular to the x-axis) is the x-axis as shown in FIG. The upper and lower ends of FIG. 2, which are the original opening surfaces, are cut out so that the width is narrow in the direction and narrow in the y-axis direction, the upper and lower two or more places have the same width, and the left and right support wall surfaces 3 of the upper and lower cut portions are the same. Then, the outside of the opening of the cut-out portion is sealed as shown at 12 and 13 in FIG. 5, and the plate-like body 8 covering each cut-out portion is stretched from the upper and lower sides at both the upper and lower sides as shown in FIG. A heat recovery unit using a hollow panel that is hermetically sealed and has two or more openings at any location on the panel to allow fluid to flow in and out. A method of making a heat recovery device having a structure in which a fluid can be held and passed by a hollow panel having a structure as shown in FIGS.

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