JPS6335330Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a dew condensation prevention device in a solar heat collector.

Conventional flat plate type solar heat collectors have had the problem of condensation occurring on the inner surface of the transparent body such as a glass plate after being installed on the roof of a building. The cause of this condensation phenomenon is that this type of collector is difficult to make completely airtight compared to vacuum glass tube type solar collectors, so the temperature difference between the outside air and the inside of the collector creates negative pressure. If this phenomenon occurs and humid air from the outside flows into the inside of the heat collector, the internal humidity will increase, but if the temperature of the outside air falls below the temperature inside the heat collector under these conditions, the permeation will decrease. Condensation occurs on the inside of the body. Another cause of condensation is rainwater entering the heat collector due to deterioration of the gasket provided at the peripheral seal of the transmitter, or the glass wool commonly used as an insulating material. The moisture contained therein evaporates due to heating by sunlight, and the internal humidity of the heat collector increases, causing dew condensation as in the above case.

When such a dew condensation phenomenon occurs, water droplets adhere to the inner surface of the transparent body and become cloudy, resulting in a problem that the transmittance of sunlight decreases and the heat collection performance of the solar collector deteriorates.

In addition, with conventional solar heat collectors, when heating without water in the water pipes, so-called dry heating, the temperature inside the heat collector becomes extremely high, which causes the heat insulating material to There was a problem that the organic substances contained in the transparent body deteriorated and vaporized, and the inner surface of the transparent body became dirty due to the adhesion of the organic substances.

The purpose of this invention is to provide a dew condensation prevention device for a solar heat collector that solves the above problems.

This invention will be explained below based on embodiments shown in the drawings.

In this specification, front, rear, left, right, and top and bottom are based on FIG. 5A, and the front means the lower side of FIG. "Top" refers to the front side of the same drawing sheet, and "bottom" refers to the back side of the drawing sheet.

In Figures 1 to 4, 1 is a solar collector;
Reference numeral 2 denotes a shallow box-shaped case that opens upward, and is made of metal, and has a horizontal part 4 extending inward at the upper edge of the peripheral wall 3, and a hanging part extending downward from the tip of the horizontal part 4. 5 is formed. 6 is a solar heat collecting plate, 7 is a water pipe connected to this, 8 is a pair of front and rear headers connecting the ends of the water pipe 7, and at the right end of these headers 8 are a water supply pipe 9 and a drain pipe 10.
are connected to each other. Reference numeral 11 is a heat insulating material made of glass wool loaded on the bottom and peripheral side of the case 2, 12 is a flat plate-shaped lower packing attached to the upper edge of the peripheral wall 3 of the case 2, and 13 is a heat insulating material placed on the upper surface of the lower packing 12. A transparent body made of a glass plate or a synthetic resin plate or the like covers the top opening of the case 2. Reference numeral 14 denotes a holding member that presses down the peripheral edge of the transparent body 13, which is a horizontal part with an upper gasket 15 on the bottom surface. 14a, and a vertical portion 14 provided in a hanging manner on the outer edge thereof and fixed to the upper edge of the peripheral wall 3.
It consists of b. Reference numeral 16 denotes an air circulation gap formed on the upper surface of the horizontal portion 4 of the peripheral wall 3 around the outer peripheries of both the upper and lower gaskets 12, 15, which also serves as a drainage flow path.

Reference numeral 17 indicates a space formed between the solar heat collector plate 6 and the transparent body 13 within the case 2, and 18 indicates that a portion of the lower gasket 12 is removed on both left and right sides of the front end of the solar heat collector 1. A pair of left and right air circulation parts 19 formed by the vertical part 14 of the transparent body pressing member 14 are located in front of the front end of the heat collector 1.
a pair of left and right bulges provided in b that bulge outward;
Reference numeral 20 denotes an outside air inlet portion formed inside each bulge portion 19, which communicates with the air circulation portion 18. Inside the space 17 of the solar heat collector 1, there is an outside air inlet 2.
Outside air is introduced from 0 through a part of the cavity 16 and the air circulation part 18. 2
Reference numeral 1 indicates a pair of left and right air circulation portions formed by removing a portion of the lower gasket 12 on both left and right sides of the rear end of the solar heat collector 1;
Vertical portion 14 of presser member 14 on the rear side of the rear end portion
a pair of left and right bulges provided in b that bulge outward;
Reference numeral 23 denotes an in-case air discharge section formed inside each bulging section 22, which communicates with the air circulation section 21. The air in the space 17 of the solar heat collector 1 is
The air is discharged from the air circulation part 21 through a part of the cavity 16 to the outside from the case air discharge part 23.

As shown in FIG. 1, the solar heat collector 1 has the following features:
It is usually installed on the roof of a building in an inclined position with the rear end high and the front end low. Then, due to heating by sunlight, the solar heat collecting plate 6 and the transparent body 13
An air convection phenomenon occurs within the space 17 between the two. The heated air in the space 17 flows through the air circulation section 21 at the rear end of the high-position heat collector 1 and the air gap 1.
6 and is discharged to the outside from the case internal air discharge section 23. On the other hand, outside air flows into the space 17 from the outside air inflow section 20 at the front end of the heat collector 1 at a low position, a part of the cavity 16, and the air circulation section 18. As a result, the air in the space 17 of the heat collector 1 is always replaced with outside air, and dew condensation on the inner surface of the transparent body 13 is prevented.

In addition, if rainwater etc. enters the interior due to deterioration of the upper packing 15, the air circulation gap 1
6 also serves as a drainage channel, so this cavity 16
From outside air inflow part 20 and case internal air discharge part 2
Water is drained appropriately through 3.

Note that here, the outside air inflow section 20, the air circulation section 18,
21 and the case air discharge part 23, the larger the opening area, the greater the dew condensation prevention effect, but if they are too large, heat loss due to convection will increase and heat collection performance will decrease, so the opening area should be It is necessary that the heat collecting performance of the heat collector 1 is not deteriorated. Such an opening area may be determined depending on the size of the solar heat collector 1 and the like.

FIG.
8, 21 (represented by a - mark), the outside air inflow part 20 of the transparent body pressing member 14, and the case internal air discharge part 23
(represented by = marks) indicates various arrangements.
In this way, the outside air inflow section 20, the air circulation sections 18, 2
1 and the case air discharge part 23 may be provided at least one each at both the front and rear ends of the heat collector 1, and they may be disposed on either the front or rear sides or the left or right sides.

As described above, the dew condensation prevention device for a solar heat collector according to this invention includes a case 2 containing a solar heat collector plate 6, a packing 12 attached to the upper edge of the peripheral wall 3 of the case 2, and a packing 12 placed on the packing 12. A solar heat collector comprising a transparent body 13 that covers the upper opening of the case 2, and a pressing member 14 consisting of a horizontal portion 14a that presses the peripheral edge of the transparent body 13 and a vertical portion 14b fixed to the upper edge of the peripheral wall 3. In the container 1, at the front end of the solar heat collector 1, the packing 12 is provided with an air circulation part 18, and the vertical part 14b of the holding member 14 is provided with an outwardly bulging part 19. Air circulation part 18 inside part 19
At the rear end of the solar heat collector 1, an air circulation part 21 is provided in the packing 12, and an outwardly bulging part is provided in the vertical part 14b of the holding member 14. 22 and an in-case air discharge part 23 communicating with the air circulation part 21 is formed inside the bulging part 22, so that the air in the space 17 of the heat collector 1 is always replaced with outside air. This makes it possible to prevent dew condensation from occurring on the inner surface of the transparent body 13.
Furthermore, even when heating is performed with no water in the water pipe 7 of the solar heat collector 1, so-called dry heating, the air inside the heat collector 1 is replaced with outside air, causing the space 17 As a result, it is possible to prevent the deterioration of the organic substances contained in the heat insulating material 11, etc., and to suppress the vaporization phenomenon of the organic substances, so that the inner surface of the transparent body 13 can be suppressed. This has the effect of preventing damage caused by staining due to adhesion of organic substances.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a schematic perspective view showing the state of use, Fig. 2 is an enlarged perspective view with the transparent body lifted, and Fig. 3 is an enlarged view of the main parts of Fig. 2. The perspective view and FIG. 4 are enlarged cross-sectional views taken along the line of FIG. 3, showing the state in which the transparent body is fitted onto the case. FIG. 5 is a schematic plan view for explaining the arrangement of openings provided in the lower packing and the transparent body pressing member. 1... Solar heat collector, 2... Case, 3... Peripheral wall, 4... Horizontal part, 5... Drooping part, 6... Solar heat collector plate, 7... Water pipe, 12... Lower packing,
13... Transparent body, 14... Pressing member, 14a...
Horizontal part, 14b...Vertical part, 16...Air circulation gap part, 17...Space part, 18, 21...Air circulation part, 19, 22...Bulging part, 20...Outside air inflow part, 23... ...Air exhaust part inside the case.

Claims (1)

[Scope of utility model registration request] Case 2 containing the solar heat collecting plate 6 and Case 2
A packing 12 attached to the upper edge of the peripheral wall 3,
A transparent body 13 placed on the packing 12 and covering the top opening of the case 2, and a holding member 14 consisting of a horizontal portion 14a that presses the peripheral edge of the transparent body 13 and a vertical portion 14b fixed to the upper edge of the peripheral wall 3. In the solar heat collector 1, an air circulation part 18 is provided in the packing 12 at the front end of the solar heat collector 1, and an outwardly bulging part 19 is provided in the vertical part 14b of the holding member 14. Provided and bulging part 1
Outside air inflow part 2 leading to air circulation part 18 is inside of 9.
0 is formed, and at the rear end of the solar heat collector 1, the gasket 12 is provided with an air circulation part 21, and the vertical part 14b of the holding member 14 is provided with an outwardly bulging part 22. A dew condensation prevention device for a solar heat collector in which an in-case air discharge part 23 communicating with an air circulation part 21 is formed inside a bulging part 22.