JP2002122360A - Solar heat air heat collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar heat air heat collector having a low radiation loss and a high heat collecting efficiency. SOLUTION: A heat collecting plate 4 is disposed between a transparent plate 2 and a rear plate 10. A front side air path 11 and a rear side air path 12 are respectively provided between the transparent plate 2 and the heat collecting plate 4 and between the rear plate 10 and the heat collecting plate 4. Air is made to flow from the rear side air path 12 to the front side air path 11 so that the introduced air having a low temperature is first heated by the rear side air path 12 of the heat collecting plate 4 on a low temperature side, and then is further heated by the front side air path 11 on a high temperature side. Because the air just after getting into contact with a rear face of an outer case has a comparatively low temperature, radiation loss on the rear face of the box is small, and because the air is finally heated by the front side air path 11 on the high temperature side, a high temperature rise value can be obtained to raise the heat collecting efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar air collector.

[0002]

2. Description of the Related Art Conventionally, there has been a solar air collector of this type as disclosed in Japanese Utility Model Laid-Open No. 61-7768. FIG. 9 shows a configuration diagram of a conventional solar air collector described in the above publication.

In FIG. 9, reference numeral 1 denotes an outer box of a solar air collector, 2 denotes a transparent plate located on the sunlight receiving surface of the outer box 1, 3 denotes a heat insulating material stretched on the inner surface of the outer box 1, Is a heat collecting plate arranged so as to partition the inside of the outer box 1 into a front side and a back side, 5 is an air inlet opening before the front side of the heat collecting plate 4, and 6 is an air inlet 5
On the other hand, an air return port on the opposite side, an exhaust port 7 opened on the back surface of the outer box 1 near the air inlet port 5, and a blower 8 and an evaporator 9 of a heat pump device are arranged inside the exhaust port 7. .

[0004]

However, in the conventional structure, the air introduced from the air inlet 5 flows along the front surface of the heat collecting plate 4 and then flows along the back surface of the heat collecting plate 4. After passing through the evaporator 9 of the heat pump using air heat, the air is exhausted from the exhaust port 7 by the blower 8. In this way, the temperature rise efficiency of the air is low because the heat passes through the back surface of the low-temperature heat collecting plate 4 after first passing through the surface of the high-temperature heat collecting plate 4. If the heat insulating effect of the stretched heat insulating material 3 is not sufficient, there is a problem that heat is increased on the back surface of the outer box 1 and heat collection efficiency is reduced.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a solar air collector having a small heat dissipation loss and good heat collection efficiency.

[0006]

In order to solve the above-mentioned problems, a solar heat air collector according to the present invention has a heat collecting plate positioned between a transparent plate and a back plate that allow sunlight to pass therethrough. A front-side air passage is formed between a plate and the heat collecting plate, and a back-side air passage is formed between the back plate and the heat collecting plate, so that air flows from the back-side air passage to the front-side air passage. Things.

As a result, the low-temperature air introduced into the solar air collector is first heated in the air passage on the back side of the heat collector plate on the low-temperature side, and then further heated in the front-side air passage on the high-temperature side. Warmed up. Thereby, since the air in contact with the outer case back surface has a relatively low temperature just introduced, the heat radiation loss on the outer case back surface is small, and finally, the temperature is raised in the high-temperature side front air passage, By taking a high final temperature rise value, heat collection with little heat dissipation loss and good heat collection efficiency can be performed.

[0008]

According to the first aspect of the present invention, a heat collecting plate is positioned between a transparent plate and a back plate that allow sunlight to pass therethrough, and a front side is disposed between the transparent plate and the heat collecting plate. Air passages,
Forming a back air passage between the back plate and the heat collecting plate,
In the configuration in which air flows from the back side air passage to the front side air passage, the low-temperature air introduced into the solar air collector is first heated in the back side air passage of the heat collecting plate on the low temperature side. Next, the temperature is further raised in the high-temperature side front air passage. Thereby, since the air in contact with the outer case back surface has a relatively low temperature just introduced, the heat radiation loss on the outer case back surface is small, and finally, the temperature is raised in the high-temperature side front air passage, The final temperature rise value is high, heat dissipation is small, and heat collection with good heat collection efficiency can be performed.

According to a second aspect of the present invention, in addition to the first aspect, an air introduction portion is provided at one end of the back side passage, and air introduced from the air introduction portion is provided on the back surface of the heat collecting plate. After flowing along the heat collector plate surface, the low-temperature air introduced into the solar air collector first flows along the lower surface of the relatively low-temperature heat collector plate. , Heat exchange with the heat collecting plate is performed efficiently and the temperature is increased.
Next, by flowing along the surface of the relatively high-temperature heat collecting plate, heat exchange is performed with the heat collecting plate, and the temperature is raised more efficiently. This allows efficient heat collection.

According to a third aspect of the present invention, in addition to the first aspect, the heat collecting plate has a plurality of small holes, and air flows from the back passage through the plurality of small holes to the front passage. When the air passes through the small holes, turbulence in the air flow occurs near the small holes, causing turbulence in the boundary layer on the surface of the heat collecting plate, increasing the heat conduction coefficient. Heat collection efficiency is improved.

The invention described in claim 4 is the first, second, and third inventions.
In addition to the invention described in the above, the transparent plate has a vacuum double glass structure in which the inside is in a vacuum state, the heat insulating effect of the transparent plate is improved, and the temperature flowing between the transparent plate and the heat collecting plate is increased. The heat collection efficiency is improved by preventing the heat radiation of the generated air.

The invention described in claim 5 is the first, second, and third inventions.
In addition to the invention described in the above, the transparent plate is configured by sandwiching the transparent resin layer with a glass plate, even if scattered objects, falling objects, etc. hit the glass, hardly break, even if broken, the effect of the resin layer, the glass The danger of scattering is reduced.

The invention described in claim 6 is the first, second, and third inventions.
In addition to the above-described invention, the heat collecting plate is formed in a corrugated shape, thereby increasing the strength of the heat collecting plate and increasing the contact area with the air, thereby improving the heat exchange efficiency.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the conventional example and the respective embodiments, the same reference numerals are given to components having the same configuration and the same operation, and a part of the description is omitted.

(Embodiment 1) FIG. 1 shows a cross section of a solar air collector according to a first embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a back plate having a heat insulating material 3 adhered on the inner side thereof. A heat collecting plate 4 is positioned between the transparent plate 2 and the back plate 10, and the transparent plate 2 and the heat collecting plate 4 are connected to each other. A rear air passage 12 is formed between the back plate 10 and the heat collecting plate 4; an air inlet 13 is opened at one end of the back air passage 12; 14 is the front air passage 11
In the same direction as the air inlet 13. 1
A discharge air passage 5 is provided with a heat exchanger 16 such as water or a refrigerant of a heat pump and a blower 8 in the discharge air passage 15.

The operation and operation of the solar air collector configured as described above will be described below. First, while the low-temperature air introduced from the air inlet 13 flows through the back side air passage 12 to the return port 6 side opposite to the air inlet 13 along the back side of the heat collector 4, the heat collecting plate 4, the temperature rises by receiving heat from the heat collector 4, and then enters the front air passage 11 through the return port 6, and the air outlet 1 along the front side of the heat collecting plate 4.
While flowing to 4, the heat is received from the heat collecting plate 4 and the temperature further rises, and the heat is guided to the discharge air passage 15 to give heat to the water or the refrigerant of the heat pump in the heat exchanger 16 for use.

As described above, in this embodiment, the heat collecting plate 4 is located between the transparent plate 2 and the back plate 10, and the front air passage 11 is provided between the transparent plate 2 and the heat collecting plate 4. , Back plate 10
A low-side air passage 12 is formed between the heat-collecting plate 4 and the rear-side air passage 12 to flow air from the rear-side air passage 12 to the front-side air passage 11, so that the introduced low-temperature air is first on the low-temperature side. The temperature is raised in the air passage 12 on the back side of the heat collecting plate 4,
The temperature is further raised in the front air passage 11 on the high temperature side. As a result, the air in contact with the back of the outer box has a relatively low temperature just introduced, so the heat loss on the back of the outer box is small,
Finally, the front side air passage 1 on the high temperature side where sunlight directly hits
By raising the temperature at 1, a high final temperature rise value can be obtained, so that heat collection with little heat dissipation loss and good heat collection efficiency can be performed.

In this embodiment, an air inlet 13 is provided at one end of the rear air passage 12 so that the air introduced from the air inlet 13 flows along the rear surface of the heat collecting plate 4 and is collected. By having a configuration that flows along the surface of the hot plate 4,
The low-temperature air introduced into the solar air collector first flows along the back surface of the relatively low-temperature heat collecting plate 4, thereby efficiently performing heat exchange with the heat collecting plate 4 and increasing the temperature. next,
By flowing along the surface of the heat collecting plate 4 having a relatively high temperature, heat exchange with the heat collecting plate 4 is performed, and the temperature is raised more efficiently. This allows efficient heat collection.

Further, since the air in contact with the back surface of the outer case has a relatively low temperature just after being introduced, the heat loss on the back surface of the outer case is small, so that the heat insulating material on the back surface of the outer case can be made thinner. There is also an effect that the cost can be reduced and the thickness can be reduced.

In this embodiment, a heat exchanger 16 such as water or a refrigerant of a heat pump and a blower 8
However, it is also possible to introduce the exhaust air passage 15 directly into a room requiring heating and use it for room heating, or other uses.

(Embodiment 2) FIG. 2 is a view showing the configuration of a solar air collector according to a second embodiment of the present invention, and FIG. 3 is an explanatory view of the air flow of a heat collecting plate in the second embodiment. In FIG.
Reference numeral 17 denotes a plurality of small holes provided in the heat collecting plate 4 and the air inlet 1.
Reference numeral 3 denotes an opening at one end of the rear air passage 12, an air outlet 14 opens at an end of the front air passage 11 in the opposite direction to the air inlet 13, and an end of the heat collecting plate 4 connects to the rear air passage. 1
2 and the front air passage 11 are sealed, and the back air passage 1 is closed.
The air flowing from the air passage 2 to the front air passage 11 has a plurality of small holes 17.
1 is different from FIG. 1 in that a plurality of small holes 17 provided in the heat collecting plate 4 are provided, and the air inlet 13 is opened at one end of the back side air passage 12. ,
The air outlet 14 is opened at the end of the front air passage 11 opposite to the air inlet 13, and the end of the heat collecting plate 4 is a point that seals the space between the back air passage 12 and the front air passage 11. .

The operation and operation of the above configuration will be described. First, the low-temperature air introduced from the air inlet 13 into the back side air passage 12 passes through the small holes 17 provided in the heat collecting plate 4, enters the front side air passage 11, and flows to the air outlet 14. During this time, the air is heated while receiving heat while being in contact with the back surface and the front surface of the heat collecting plate 4, guided to the discharge air passage 15, and used in the heat exchanger 16.

When the air passes through the small hole 17, as shown in FIG.
Turbulence occurs in the boundary layer on the surface of the heat collecting plate 4 and the heat conduction coefficient increases, so that the heat collecting efficiency improves.

As described above, in the present embodiment, the heat collecting plate 4 has the plurality of small holes 17, and the air flows from the back passage 12 to the front passage 11 through the plurality of small holes 17. Thus, when air passes through the small holes 17, the small holes 1
The turbulence of the air flow occurs in the vicinity of 7, and turbulence occurs in the boundary layer on the surface of the heat collecting plate 4, the heat conduction coefficient increases, and the heat collecting efficiency improves.

4 and 5 show examples of the configuration of the small holes of the heat collecting plate 4. FIG. Although FIG. 4 illustrates a round hole and FIG. 5 illustrates a square hole, similar effects can be obtained with other shapes.

(Embodiment 3) FIG. 6 is a configuration diagram of a solar air collector according to a third embodiment of the present invention. 6 differs from FIG. 2 in that the transparent plate 2 is a vacuum double glass 18 in which the inside is in a vacuum state.

In the above structure, the transparent plate 2 is made of the vacuum double glass 18 in which the inside is in a vacuum state, so that the heat insulating effect of the transparent plate 2 is improved, and the gap between the transparent plate 2 and the heat collecting plate 4 is improved. When the temperature rises, the heat dissipation of the air is prevented and the heat collection efficiency is improved.

(Embodiment 4) FIG. 7 is a structural view of a solar air collector according to a fourth embodiment of the present invention. 7 is different from FIG. 2 in that the transparent plate 2 has a transparent resin layer 19.
Is sandwiched between the glass plates 20.

In the above configuration, the transparent plate 4 is formed by sandwiching the transparent resin layer 19 with the glass plate 20 so that a scattered object, a falling object, or the like hardly breaks even if it hits the glass. The effect reduces the risk of glass scattering.

(Embodiment 5) FIG. 8 is a block diagram of a solar air collector according to a fifth embodiment of the present invention. 8 differs from FIG. 2 in that the heat collecting plate 4 is formed in a waveform.

In the above configuration, by forming the heat collecting plate 4 in a waveform, the strength of the heat collecting plate is increased,
By increasing the contact area with air, the heat exchange efficiency is improved and the heat collection efficiency is improved.

[0033]

As described above, according to the first to sixth aspects of the present invention, it is possible to provide a solar air collector having a small heat radiation loss and a good heat collection efficiency.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a solar air collector according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a solar air collector according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of an air flow of a heat collecting plate in Embodiment 2 of the present invention.

FIG. 4 is a diagram illustrating a configuration example of small holes of a heat collecting plate according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration example of a small hole of a heat collecting plate in a second embodiment of the present invention.

FIG. 6 is a configuration diagram of a solar air collector according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a solar air collector according to a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram of a solar air collector according to Embodiment 5 of the present invention.

FIG. 9 is a configuration diagram of a conventional solar air collector.

[Explanation of symbols]

 Reference Signs List 2 transparent plate 4 heat collecting plate 10 back plate 11 front air passage 12 back air passage 13 air introduction unit 17 small hole 18 vacuum double glass 19 transparent resin layer 20 glass plate

 ──────────────────────────────────────────────────の Continued on the front page (72) Ryuta Kondo, Inventor 1006, Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshitsugu Nishiyama 1006, Oaza Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A heat collecting plate is positioned between a transparent plate and a back plate that transmit sunlight, a front air passage is provided between the transparent plate and the heat collecting plate, and the back plate and the heat collecting plate A solar air collector having a configuration in which a back side air passage is formed between the plate and a plate, and air flows from the back side air passage to the front side air passage. 2. An air inlet portion is provided at one end of the back side passage, and air introduced from the air inlet portion flows along the back surface of the heat collector plate and then flows along the surface of the heat collector plate. The solar air collector according to claim 1. 3. The solar heat air collector according to claim 1, wherein the heat collecting plate has a plurality of small holes, and the air flows from the back passage to the front passage through the plurality of small holes. 4. The solar air collector according to claim 1, wherein the transparent plate has a vacuum double glass structure in which the inside is in a vacuum state. 5. The solar heat air collector according to claim 1, wherein the transparent plate has a configuration in which a transparent resin layer is sandwiched between glass plates. 6. The heat collecting plate according to claim 1, wherein the heat collecting plate is formed in a corrugated shape.
The solar air collector according to any one of the preceding claims.