JPS6012538B2 - long solar collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat solar collector, and particularly to a long solar collector having a longitudinally elongated shape of a hollow body such as a tube through which a heat transport medium flows.

Flat solar collectors, in which the heat transport medium is heated internally, represent a major part of the cost in many devices powered by solar energy.

This applies in particular to collectors in which the heat transport medium flows through a metal body whose front and rear sides are insulated to prevent heat loss. In known solar collectors, the collector body containing the heat transport medium inside is surrounded by a somewhat larger, mechanically strong container and covered on the front by one to three glass plates. ing.

A thermally insulating material several centimeters thick, for example glass wool, asbestos or foamed plastic, is then inserted between the back of the collector body and the container. The size of such collectors is limited to a few square meters, since the larger they become, the higher the transport costs and transport risks become. Also, a disadvantage of this technique is that the cost of the container and its assembly is unreasonably high, and for larger armors the cost of the fittings of the multiple collector units is always quite high.

According to the invention, instead of a large number of collector units of small area, elongated collectors are used which are assembled into collectors of 10 to 100 or more lengths from prefabricated individual elements at the installation site. This makes it possible to produce solar collectors that are much larger and cheaper than conventional ones.

Embodiments of the present invention will be described below with reference to the drawings. A fluid heat transport medium is wound on a rollable metal hollow body 2, for example, on a reel, transported to the installation site, and rewound.
It is meant to be flushed inside the straightened tube.

This metal hollow body 2 is usually of the same length as the overall length of the collector. This hollow body 2 may have metallic fins 3 which absorb the radiation of the incoming solar radiation, as shown in FIG. 1A, or a corresponding profile of the hollow body 2, as shown in FIG. It may also include a well-known absorbent thin plate 4 pressed along the hollow body 2. For transport reasons, the pressed absorbent sheet 4 has a length of several meters and a width equal to the transverse width of the collector.

The insulation provided on the back side of the metal hollow body 2 is made up of individual parts that collectively have the same width as the entire collector and have a length of only a small dimension. Each of these parts may be constructed of a single piece 5 of the same material, e.g. polyurethane foam, as shown in FIG. 2, or of a plurality of interconnected members, e.g. as shown in FIG. As such, it may be constructed of a non-metallic groove-shaped component 7 lined with glass wool, asbestos, or other insulating material 6. These insulating parts are shaped so that the metal parts of the collector can be fitted inside and along them. The dimensions of these insulating sections in the direction of flow of the heat transfer medium are at least 4 times larger than the dimensions in the cross-flow direction when the collector is assembled.
more than doubled. On the incident side, it is preferable to fit a glass plate 8 or a synthetic resin plate onto the heat insulator above the metal hollow body 2.

All insulators are then covered on top and on the sides by strong, weather-resistant and flexible thin synthetic resin plates 9.
Note that this may be a synthetic resin thin film or a glass plate.
The heat insulating body and the plate covering it from above are mechanically connected to each other at the seam and sealed from the outside by a magnetic ring 9'. In the elongated solar collector according to the invention, when the heat transport medium and the working medium are for a heat engine, the medium flowing through the collector not only undergoes heating but also undergoes evaporation.

In such cases, it is important to increase the cross-section of the hollow space of the metal hollow body in the part of the collector where the evaporation takes place, in order to have a free upper surface for the evaporation and a space for vapor transport. The cross-sectional change must be greater than 10% to be sufficient. The metal hollow body is seated approximately horizontally in the evaporation section. Of course, the evaporation section can be separated from the heating section.

[Brief explanation of the drawing]

Figure 1A is a schematic sectional view of the metal hollow body, Figure LB is a schematic sectional view showing the state in which the absorbent thin plate is attached to the metal hollow body, Figure 2 is a perspective view of the heat insulator, and Figure 3 1 is a sectional view showing an example of a solar heat collector of the present invention. 2. ．． ...・Metal hollow body (tube), 3...fins,
4. ．． ... Heat absorbing thin plate, 5 ... Heat insulator, 6
...Insulating material, 7...Groove-shaped component, 8.
...Glass or synthetic resin board, 9...Synthetic resin board. FIG. 3 FIG. lo FIG. lb FIG. 2

Claims (1)

[Scope of Claims] 1. The dimension in the direction of flow of the heat transport medium is at least four times the dimension in the direction transverse to the flow, the back insulation part and the mechanical support structure are made of a plurality of members, and Elongated solar heat collector, characterized in that the metal hollow body through which the medium flows consists of an integral single piece extending over several of the back insulation sections. 2. The elongated solar heat collector according to claim 1, wherein the sunlight incident side is covered at the seam with a transparent synthetic resin plate sealed with an elastic ring. 3. The elongated solar heat collector according to claim 1, wherein the side into which sunlight rays enter is covered with a synthetic resin thin film. 4. Claims 1 to 4, in which the heat-conducting medium flows through a metal tube to which metal fins that absorb incident light are directly bonded or otherwise installed in a good heat-transfer state. The long solar collector according to any one of Item 3. 5. According to any one of claims 1 to 4, in which the cross section of the flow for the heat transport medium in the hollow metal body in the part located on the exit side of the heat transport medium is increased by 10% or more. long solar collector.