JPH0129484Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a solar heat collector that uses vacuum insulation to convert sunlight into thermal energy.

1 to 3 show conventional vacuum type solar collectors. In these figures, 1 is a solar collector, 2 is a plurality of heat collecting tube elements constituting the main part of the solar heat collector 1, 3 is a transparent tube forming the outer shell of the heat collecting tube element 2, and the transparent tube 3 has one end. is closed in a hemispherical shape, and the other end is open. Reference numeral 4 denotes a heat collecting plate supported by elastic means on the horizontal center line of the transparent tube 3, and the surface of the heat collecting plate 4 is treated with a selective absorption film. Reference numeral 5 indicates a U-shaped heat collecting tube whose straight portion is fixed to the back surface of the heat collecting plate 4 by means such as welding, and 6 indicates a pair of ends of the heat collecting pipe 5 passing through the open end of the transparent tube 3. The end plate 6 is a sealing means for the transparent tube 3, and the end plate 6 is a sealing means for the heat collecting tube 5.
and are welded to each other in an airtight manner. Moreover, the space surrounded by the end plate 6 and the transparent tube 3 is
It is evacuated to a high vacuum of 10 ^-3 Torr or less. 7 is an exhaust pipe provided on the end plate 6, 8 is a support box that supports the end of the two groups of heat collecting tube elements on the end plate 6 side, and 9 is a watertight connection between the ends of the heat collecting pipes 5 within the support box 8. The header tube 10 is a support box that supports the end of the two groups of heat collecting tube elements opposite to the end plate 6.

The conventional solar heat collector is configured as described above, and sunlight that enters the solar heat collector 1 passes through the transparent tube 3 of the heat collection tube element 2, is absorbed by the selective absorption film on the surface of the heat collection plate 4, and becomes thermal energy. , heats a heat medium such as water flowing inside the heat collecting pipe 5. Heat loss from the heat collecting plate 4 is limited by convection and conduction due to vacuum insulation, and radiation is limited by the selective absorption film. Therefore, compared to general flat plate type solar collectors, the heat collection efficiency per effective area, that is, the area of the heat collecting plate in the vacuum type and the opening area of the transparent plate in the flat plate type is high, especially when collecting high temperature heat.

However, the vacuum type solar collector 1 as described above is supported by a pair of support boxes 8 and 10,
In addition, there is a gap between the transparent tubes 3, and the transparent tubes 3
Because there is a gap in the width direction of the heat collecting plate 4 and the tips of the heat collecting tubes 5 protrude outside the heat collecting plate 4, the ratio of the effective heat collecting area to the external area is poor, and the ratio of the effective heat collecting area to the external area is low. The drawback was that the difference in heat collection efficiency with flat collectors narrowed.

This idea improves the ratio of effective heat collection area to external area by fixing heat collection tubes within the projected area of the heat collection plate, and provides a vacuum type solar collector that eliminates the drawbacks of the conventional ones mentioned above. The purpose is to

An embodiment of this invention will be described below with reference to FIGS. 4 and 5.

In FIGS. 4 and 5, 3 is a transparent tube of the heat collecting tube element 2, 8 is a support box, and 9 is a header tube, which are the same as those of the conventional device described above. Reference numeral 4 denotes a heat collecting plate disposed at the horizontal center of the transparent tube 3, and the tip of the heat collecting plate 4 has a semicircular shape to match the closed end of the transparent tube 3, so that it almost touches the closed end of the transparent tube 3. It has an area of 2. Reference numeral 5 denotes a heat collecting tube made of a U-shaped heat pipe, and the heat collecting pipe 5, including its U-shaped part, is placed on the lower surface of the heat collecting plate 4 within its projected area and fixed by means such as welding. has been done. Reference numeral 11 denotes a narrow band-shaped support that presses and supports the end of the second group of heat collecting tube elements opposite to the end plate 6, that is, the vicinity of the closed end of the transparent tube 3. It should be noted that the configuration of this embodiment other than those described above is the same as that of the conventional solar collector shown in FIGS. 1 to 3, so a description thereof will be omitted.

The solar collector 1 configured as described above is
The heat collecting plate 4 occupies a large area within the transparent tube 3, and the entire surface of the heat collecting pipe 5 is fixed to the heat collecting plate 4, and the two groups of heat collecting tube elements are further supported by a band-shaped support 11. Therefore, even if the external area of the solar collector 1 is the same as that of the conventional solar collector 1 shown in FIGS. 1 to 3, more sunlight is converted into heat energy.

In addition, in this invention, the heat collecting plate 4 is the heat collecting pipe 5.
The method of fixing the heat collecting plate involves manufacturing the heat collecting plate by extrusion molding of aluminum, integrally providing ribs that hold the heat collecting tubes on the back side, and machining only the ribs where the U-shaped part of the heat collecting tubes rests after molding. Another method is to scrape it off and press-fit the heat collecting tube into the rib.

In addition, in the case of a method in which heat is exchanged in a support box using heat collecting pipes, if a liquid with a low freezing temperature is used as the working fluid of the heat pipe, there is no fear of damage to the heat collecting pipes due to cold temperatures in winter.

As explained above, in the solar heat collector of this invention, the end shape of the heat collecting plate of the heat collecting tube made of a U-shaped heat pipe is molded to match the end shape of the transparent tube, and the heat collecting plates are arranged at all sides inside the transparent tube. In addition, since the area near the end of the transparent tube is supported by a narrow band-shaped support, the area inside the transparent tube can be used effectively, the shadow cast by the support is small, and the collection per external area is reduced. This has the effect of increasing thermal efficiency.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional vacuum type solar collector; Fig. 2 is a plan view showing a conventional heat collecting tube element;
3 is an enlarged sectional view showing the tip of the heat collecting tube element shown in FIG. 2, FIG. 4 is a plan view of a solar heat collector according to an embodiment of this invention, and FIG. 5 is a heat collecting tube of the solar heat collector shown in FIG. 4. FIG. 3 is an enlarged cross-sectional view showing the tip of the element. 1... Solar heat collector, 2... Heat collecting tube element, 3
...Transparent tube, 4... Heat collection plate, 5... Heat collection tube, 6...
...End plate, 8...Support box, 11...Support. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A transparent tube 3 with one end closed, a heat collecting plate 4 installed in the center of the transparent tube 3 and arranged so as to match the shape of the tip to the shape of the closed end of the transparent tube so as to be almost in contact with the closed end, and the heat collecting plate 4. A heat collecting tube 5 made of a U-shaped heat pipe is fixed within the projected area of the transparent tube 3, and one end of the heat collecting tube 5 is provided at a portion where it penetrates the open end of the transparent tube 3, so that the inside of the transparent tube 3 is vacuum-tight. It has a plurality of heat collecting tube elements 2 provided with end plates 6 for sealing, and supports the ends of these heat collecting tube elements 2 on the end plate 6 side with a support box 8, and also supports the end plates 6 of the two groups of heat collecting tube elements. A solar heat collector characterized in that the vicinity of the opposite end of the solar heat collector is supported by a narrow band-shaped support 11.