JPS5851565Y2 - solar collector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a concentrating solar collector that combines a heat collecting element made of a vacuum transparent tube enclosing a heat collecting plate and a reflecting plate.

As such a condensing type, as shown in Fig. 1, a reflective element 1 has a paraboloid 1a and a circular arc surface 1b formed in succession, and from point A, which is the focal point of the paraboloid 1a, that is, the center of the circular arc surface, to the circular arc surface. The heat collecting plates 2 are placed on the outer edges B of 1b, and the sunlight reflected from the reflective element 1 is collected on the back side of the heat collecting member 2 (the side facing the reflecting plate).
It is now accepted at

All such light-concentrating heat collecting plates 2 are designed to receive sunlight on the back side, and are heat-insulated on the front side so as not to radiate heat.

This treatment is done because although the surface side can receive sunlight, the heat radiation is greater than the heat reception.

On the other hand, in order to improve the light collection efficiency, it is better to increase the aperture width of the paraboloid 1a (the distance from point A to the outer edge C of the paraboloid 1a).

Therefore, the outer edge C is located above the heat collecting member 2, and its upper limit is the limit of incidence from the sun S at the winter solstice.

However, when attempting to obtain the required amount of heat collection by using a plurality of such single reflective elements, the distance between adjacent heat collection members 2 must be L dimension as shown in Figure 2, and each Since the reflective element is independent, its installation is complicated.

The present invention was devised in view of this point, and the outer edge of the paraboloid is lowered to reduce the opening width of the paraboloid to some extent, but this reduction is compensated for by using a vacuum tube type heat collecting element with less heat loss. In addition, by integrally forming the reflector plate, costs are reduced and installation workability is improved, and the distance between heat collecting elements is shortened to increase the amount of heat collected by placing more heat collecting elements in a limited installation space. It was designed to let you do so.

An example will be described below with reference to FIGS. 3 and 4. A radiation plate M having a reflective surface formed of a metal plate such as stainless steel or a synthetic resin plate has a plurality of parabolic surfaces 1a and arcuate surfaces 1b. It consists of a reflective element 1, and the outer edge C of the paraboloid 1a is continuous with the outer edge B of the circular arc surface 1b of the adjacent reflective element 1, and the heights of the outer edges of the surface are approximately the same. It is integrally formed with the above-mentioned material.

Vacuum tube type heat collecting elements H are arranged on the arcuate surfaces 1b of each of the reflective elements 1, 1, . . . at intervals from the arcuate surfaces.
As shown in Fig. 5, a copper pipe for passing a heat medium such as water is installed in a glass vacuum outer tube 3, and a wing-shaped heat collecting plate 2 made of copper, aluminum, etc. is attached to the copper pipe 4. It is composed of

The heat collecting elements H, H... are each reflective element 1.
When placing the heat collecting plate 2 on the top, the heat collecting plate 2 has a parabolic surface 1a and a circular arc surface 1.
The heat collecting plate 2 is placed horizontally so that the outer edges B and C of the heat collecting plate 2 are substantially aligned in a line connecting each other, and one end of the heat collecting plate 2 is substantially located at the focal point A of the paraboloid 1a. Ru.

Figure 6 shows a combination of reflective elements 1, 1, etc. so that the bottom surface of the reflector M is on a line inclined at an angle θ from the horizontal, and in this case, the paraboloid 1a is a right triangular shape. Since this corresponds to the oblique side, it is possible to make the aperture width of the paraboloid 1a larger than that shown in FIG.

When using this reflector, the heat collecting plate 2 of the heat collecting element H is installed horizontally.

The sunlight is directly irradiated onto the surface of the heat collecting plate 2, and the reflected light from each reflective element 1 is irradiated onto the back surface of the heat collecting plate, so that the heat medium in the heat collecting pipe 4 is heated. Ru.

Since the vacuum layer of the vacuum tube type heat collecting element exhibits a heat insulating function, there is no heat radiation from the surface of the heat collecting plate, and even direct light can be used for heat collection, which has beneficial effects.

Also, since the outer edge of the paraboloid and the outer edge of the adjacent arcuate surface of the reflecting element are continuous and the heights of the outer edge of the surface are approximately the same, the reflector is constructed integrally, so it is somewhat parabolic. Although the opening width of the surface becomes narrower, the interval l between the heat collecting elements becomes smaller as shown by the dotted line in Figure 2, and many heat collecting elements can be arranged in a limited installation space.

Moreover, since a vacuum tube type heat collecting element is used to collect heat not only by reflected light but also by direct light, the reduction in the opening width of the paraboloid can be compensated for.

[Brief explanation of drawings]

Figure 1 is an end view explaining the principle of the heat collector of the present invention, Figure 2
The figure is an end view comparing the heat collector of the present invention with a plurality of the heat collectors of the present invention arranged in parallel in Fig. 1, Fig. 3 is a sectional view of the heat collector of the present invention, Fig. 4 is a perspective view of the same, and Fig. 5 is a comparison of the heat collector of the present invention. FIG. 6 is a sectional view of a heat collecting element used in the present invention, and an end view illustrating another embodiment of the present invention. 1... Reflective element, 1a... Paraboloid, 1
b...Circular surface, H...Heat collecting element, 2.
...Heat collecting plate.

Claims (1)

[Scope of utility model registration request] A plurality of reflecting elements each having a reflecting surface consisting of a paraboloid and an arcuate surface are arranged side by side, and the outer edge of the paraboloid of one reflecting element is continuous with the outer edge of the arcuate surface of an adjacent reflecting element. The reflective plate is formed by integrally forming the two outer edges with approximately the same height, while the heat collecting element consisting of a vacuum transparent tube with the heat collecting plate enclosed is attached to each reflective element. 1. A solar heat collector mounted above a circular arc surface at a distance from the circular arc surface, and with a heat collecting plate substantially aligned with a line connecting the focal point of the paraboloid and the outer edge of the circular arc surface.