JPH045964Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a solar heat collector that circulates a heat medium and collects solar heat, and particularly relates to measures against snow damage.

<Prior Art> Fig. 3 shows the basic structure of a typical conventional solar heat collector.

In Figure 3, 1 is a transparent material (glass etc.), 2
3 is the outer frame, 4 is the upper header tube,
Reference numeral 5 denotes a lower header tube, and a heat collecting plate 6 is housed in a box formed by these.

Heat collectors are placed in locations that are most advantageous for collecting solar heat.
It is installed at an installation angle α with respect to the horizontal plane. α is
Since it is advantageous to maximize the amount of heat collected per year, the angle is usually set to be approximately the same as the angle of the installation location, but this can be changed depending on the type of load, installation conditions, etc.

Since the installation location is often an environment that is directly affected by weather conditions, the above-mentioned box is designed to have sufficient strength and weather resistance. However, with the spread of solar systems, the area where heat collectors are installed has expanded, and damage to the heat collectors due to snow accumulation has become a problem.

That is, in FIG. 4, component forces F ₁ and F ₂ of the load F due to the snowfall 8 are applied to the heat collector 7.

Here, F ₁ = F・cos α: Force perpendicular to the surface of the transparent body F ₂ = F ₁・μ: Force directed downward along the surface of the transparent body, where α: Installation angle, μ: Coefficient of friction Until now, as a countermeasure against snow accumulation, , the following methods are used.

Installation angle: Increase α and decrease F ₁ .

Remove snow regularly.

Melt snow by spraying groundwater from outside.

Although this is an effective method, it is disadvantageous in terms of cost, and in reality, the current method is to prevent damage to the heat collector and suspend heat collection operation during snowy periods.

In addition, due to the freezing of the snow on the transparent body surface 1 and the transparent body presser 2, F ₂ ≒ F・sin α, so a large force is generated in the direction of the transparent body surface, especially on the transparent body presser located below the transparent body surface. It may lead to destruction,
It's becoming a problem.

FIG. 5 shows a detailed view of section B in FIG. 4. In the figure, 8 is snow accumulation, 9 is an icy part, and 10 is a transmitter presser located at the lower part of the surface of the transmitter. Due to the increase in snow on the top surface of the heat collector due to snowfall, the transmitter presser (aluminum, etc.) 1 is more effective than the transmitter (glass, etc.) 1.
Since 0 has a high thermal conductivity, the temperature decreases relatively quickly, and water droplets etc. that melt and flow down from the upper transmitting body 1 etc. accumulate around it and form a frozen layer 9. Therefore, the force F ₂ in one direction on the transparent body surface generated by the snow accumulation mentioned above
〓F・sinα is blocked by this freezing layer 9 from falling snow, so most of it is applied to the lower transparent body presser 10, that is, in FIG. 5, f〓F ₂ ≒
F·sin α, which leads to destruction of the lower transparent body holder 10 and its surroundings.

<Purpose> The present invention has been developed in view of the above points, and an object of the present invention is to eliminate the formation of a frozen layer on the frame material, which causes damage due to snow accumulation.

<Examples> Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a layout diagram of an embodiment of the present invention. In this FIG. 1, 7 is a solar heat collector in which a plurality of solar heat collectors are arranged in parallel. This solar heat collector 7 is installed at an angle with one side of the box facing downward, so that it can receive sunlight more easily. As shown in FIG. 2, which is an enlarged perspective view, this solar heat collector 7
A transparent plate 1 is placed on the top surface of a box, and the periphery of the transparent plate 1 is pressed and fixed with a frame member 10 made of metal such as aluminum. A heating element 11 is provided in the frame member 10 located below the box body. This heating element 11 forms an electric circuit closed on the left side, and generates heat when energized through internal wiring 12. The heating element 11 is provided from the left and right ends of the frame member 10 so as to heat the entire frame member 10.

In the above embodiment, if the heating element 11 is provided at the time of shipment for use in a snowy area, the heating element 11 is provided on the inner surface of the frame member 10. On the other hand, when installing the heating element 11 as a retrofit component for snow accumulation prevention in an existing solar heat collector, the heating element 11 may be attached to a transparent film and installed, for example.

Returning to FIG. 1, the heating elements 11 provided in a plurality of solar heat collectors are electrically connected in parallel by wiring 14 so that the heat generating elements 11 of each solar heat collector generate heat uniformly. It's getting old.

Now, in such a solar heat collector, the heating element 11 is energized during snowfall in winter. heating element 1
When energized, the heating element 11 heats the frame member 10 disposed below, and the entire frame member 10 becomes high temperature.

Therefore, even if melted water flows down on the transparent plate 1 during snowfall, or snow slides down and comes into contact with the lower frame material 10, the water or snow that came into contact will come into contact with the high-temperature frame material 10. Therefore, it does not form a frozen layer, and even if it does, it can be immediately melted by heating. Therefore, since no frozen layer is formed, there is nothing to prevent the snow from sliding down, and the snow can slide off the top of the solar heat collector smoothly, making it difficult for snow to accumulate on the top of the solar heat collector. Become.

Note that the heating element 11 cannot be prevented from being provided not only on the frame material 10 but also on the transparent plate 1.

<Effects> According to the present invention, since the heating element is provided on the frame material placed below, the frame material can be heated by the heating element, and by heating the frame material, the heating element can be heated. The formation of a frozen layer can be eliminated. Therefore, this frozen layer can smoothly slide down the snow that causes obstruction, making it difficult for snow to accumulate on the solar heat collector, and preventing damage to the solar heat collector due to snow accumulation. can.

[Brief explanation of the drawing]

Fig. 1 is a layout diagram of an embodiment of the present invention, Fig. 2 is an enlarged view of the main parts of the invention, Fig. 3 is a perspective view of a conventional solar heat collector, Fig. 4 is a side view of the same, and Fig. 5 is Enlarged view of the main part of the same as above (enlarged view of part B in Figure 2). 1...Transparent plate, 10...Frame material, 11...Heating element.

Claims (1)

[Scope of Claim for Utility Model Registration] A solar heat collector consisting of a transparent plate placed on the top surface of a box body and a metal frame material press-fixed around the transparent plate, one side of the box body. What is claimed is: 1. A solar heat collector which is installed with a box arranged downward and a box body inclined, characterized in that a heating element is disposed at least on a frame material located below the box body.