JPS6028908Y2 - Solar collector plate - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat collecting plate attached to a heat medium tube housed in a vacuum glass tube in a solar heat collector.

Conventional heat collecting plates of this type are often in the form of flat plates, and such a heat collecting plate is shown in a cross-sectional view in FIG.

In the figure, reference numeral 1 denotes a translucent vacuum glass tube, the inside of which is a vacuum layer 2, with a heat medium tube 3 disposed in the center, and a heat medium 4 flowing inside the heat medium tube 3. ing.

The flat heat collecting plate 5 is attached by a camming process so as to surround the heat medium pipe 3 at a curved portion 5a in the center for heat transfer.

The angle of the heat collecting plate 5 can be changed by rotating the vacuum glass tube to rotate the heat medium tube 3, thereby changing the angle of the heat collecting plate.

When using such a vacuum glass tube as a solar collector, the angle of inclination of the collector plate is optimal relative to the sun's position, that is, the solar rays are incident perpendicularly to the collector plate during the hours when the solar rays are strongest. It is installed at an angle of inclination.

Therefore, when the sun's rays are incident on the heat collecting plate at an angle θ from the S direction, for example, as shown in Fig. 5, the effective width A-B of the heat collecting plate is The width of the heat collection is Cosθ of the part corresponding to the line segment C-D.
However, the heat collection efficiency is low.

Next, we will explain the case of a heat collecting plate with a nearly circular cross section as shown in Fig. 2 as another conventional device. 1 is a translucent vacuum glass tube, 2 is a vacuum layer, and 13 is a heat medium tube. , 131 is a heat medium introduction pipe, 4 is a heat medium, and a heat collecting plate 15 having a nearly circular cross section and a partially missing portion is welded to the heat medium pipe 13 at 6 points.

In the heat collecting plate having this structure, even if the angle of incidence of sunlight changes, the heat collecting plate 15 receives light over its entire surface, and the heat collecting efficiency is extremely high.

However, this structure has manufacturing difficulties.

In other words, the heat collecting plate 15 and the heat medium tube 13 cannot be connected by the simple method of fitting and caulking, but the complicated method of welding has to be used, and the heat medium tube 15 is coaxial with the vacuum glass tube 1. The disadvantage was that the heat collector structure was complicated because the heat collector structure was not included.

This invention eliminates the above-mentioned drawbacks and places the heat medium tube in the center of the vacuum glass tube, and the heat collecting plate attached to this is a heat collecting plate with high heat collecting efficiency so that the heat receiving surface does not decrease even if the direction of solar incidence changes. The purpose is to provide

According to the present invention, the heat collecting plate is formed so that its cross-sectional shape is W-shaped or M-shaped, and the part that is attached to the heat medium pipe is located at the symmetrical center point of the W-shaped or M-shaped shape. This is achieved by providing

Examples of this invention will be described below based on the drawings.

Figures 3 and 4 are cross-sectional views of a heat collecting tube housing a heat collecting plate, which is an embodiment of this invention. The same parts as in FIGS. 1 and 2 are given the same reference numerals on both sides.

First, referring to FIG. 3, the heat collecting plate 25, which is formed to have a W-shaped cross section, is attached by caulking so as to surround the heat medium pipe 3 at a curved portion 25a provided at the center point of the W-shape for heat transfer. and is rotatable around the heat medium pipe 3.

In actual use, it is preferable that the W-shaped leg portions of the heat collecting plate be arranged in accordance with the most average inclination angle of sunlight.

Thus, in the case of the flat heat collecting plate of the conventional device, as shown in Fig. 5, the light receiving area was small as Cos θ in the portion corresponding to the line segment CD, but in the case of the W-shaped heat collecting plate of the present invention, the light receiving area is small. Since the light is received in both parts (inside and outside), the line segment E-F
It spreads to a larger extent than in the case of a flat plate.

The heat collecting plate 35, which has an M-shaped cross section as shown in FIG. It can be rotated around 3.

The actual use and the state of increase in the heat receiving surface are the same as in the case of the heat collecting plate having a W-shaped cross section as shown in FIG. 3, so a description thereof will be omitted.

According to the present invention described above, the cross-sectional shape is W-shaped or M-shaped, which is a simple configuration, and the heat receiving area is larger than that of a flat heat collecting plate, especially when the angle of incidence of sunlight is less than 90°. It has the advantage of greatly improving thermal efficiency.

Furthermore, since the heat medium tube can be placed concentrically with the glass tube and the heat collecting plate can be attached by caulking, the heat collecting efficiency can be improved without complicating the heat collector structure.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of heat collection tubes that house conventionally shaped heat collection plates. Figures 3 and 4 are cross-sectional views of a heat collecting tube housing a heat collecting plate according to an embodiment of the present invention, and Fig. 3 shows a heat collecting pipe with a W-shaped cross section. In the case of plates, FIG. 4 shows the case of a heat collecting plate with an M-shaped cross section, and FIG. 5 is a diagram showing the relationship between heat receiving plates of various shapes and the solar incident angle. 1: Vacuum glass tube, 3: Heat medium tube, 25, 35: Heat collecting plate.

Claims (1)

[Scope of utility model registration request] A solar heat collector in which a heat medium tube is housed in a vacuum glass tube, and the cross-sectional shape of a heat collecting plate attached to the heat medium tube for heat transfer is shaped into a W-shape or a W-shape. A heat collecting plate for a solar heat collector, characterized in that the heat transfer pipe of the plate is mounted in a W-shape or at a symmetrical center point of a W-shape.