DE2724035A1 - Planar elongate solar energy collector - mfd. from segmented isolation and support structures and continuous flow pipes - Google Patents

Abstract

Solar energy collector has a flow direction length >=4 times its beadth, with the isolation and mechanical support structures on the rear side formed from several parts, and the metallic heat fluid conducting pipes extending over several of these structures. The metallic heat fluid pipes may be covered and connected thermally by a shaped metallic cover shell positioned beneath glass and plastics cover plates. The isolation layer is formed from longitudinally flanged segments. Gives cheaper construction and connection of the collector shell structure.

Description

PATENT DESCRIPTION

Solar flat-plate collectors in which a heat transport medium heats account for the majority of solar-powered systems as the main cost component This applies in particular to collectors in which the heat transport medium A metallic body flows through it, which prevents heat loss on the front and back is isolated.

According to the current state of the art, it becomes the heat transport medium actual collector body containing a somewhat larger, mechanically stiff, Surrounded on its front with 1 - 3 glass panes covered box. Between the back of the actual collector body and this box is located Thermal insulation material in a layer thickness of a few cm, such as glass or rock wool or foamed plastics. The size of such collectors is limited to a few 2 m, otherwise the transport costs and risks become too high.

The disadvantage of this technology is the disproportionately high price of the enclosing box and its assembly as well as that of larger systems more significant costs for the pipe connections of the numerous individual collectors.

According to the invention, the production is much larger and at the same time This allows much cheaper solar collectors instead of many Single collectors with a small area, large, elongated collectors are used, the 2 individual components prefabricated at the place of use to long collectors from lo - loo m and more can be assembled together. The liquid heat transport medium flows in metallic, windable hollow bodies, for example tubes, which are on rollers transported, unwound and straightened to the assembly site. These metallic hollow bodies will usually be as long as the entire long collector. You can either have metallic surfaces on the side to absorb the incident solar radiation absorb, or with absorption sheets, which in a known manner with corresponding Profiles are provided and clamped onto the metallic hollow body (see Fig. 1 a and 1 b), be provided.

For reasons of transport, the clamped-on absorption plates only have Lenses of a few meters and usually the width of the entire collector.

The rear thermal insulation of the metallic hollow body is made Built up of individual parts that are generally as wide as the overall collector, but only a few meters long. These sections can be the same from a single piece Materials consist, for example, polyurethane foam (see Fig. 2) or from several interconnected pieces, for example a gutter from not metallic building material, which with glass or mineral wool or another, heat-insulating Material is designed (see Fig. 3). These insulation parts are shaped eo that the metallic parts of the collector can be laid out lengthways in it.

Towards the irradiation side, in the insulation bodies above Glass or plastic panes can be inserted into the metallic hollow body. Of the The entire insulation body is covered by a weather-resistant, weather-resistant, flexible plastic plate covered on top and sides. It can be through a plastic film or be replaced by laid-on glass plates.

The insulation body and the top cover plates are attached to the Joints mechanically connected to each other and by an elastic profile ring sealed to the outside.

With a long collector of this type, if the heat transport medium is also the working medium for a heat engine, not just the heating, but also the evaporation takes place in one pass through the long collector. In such cases it makes sense to place it in the part of the collector where the evaporation takes place takes place to enlarge the cross-section of the cavity in the metallic inner body, all the more free surface for evaporation and cross-section for vapor transport to win. The change in cross-section should, in order to be sufficient, more than lo Z be; the metallic hollow bodies are approximately in the evaporator section Of course, the evaporator part can also be installed horizontally from the heater part be separated.

L e r s e i t e

Claims (5)

PATENT CLAIMS 1. Solar flat plate collector, characterized in that that its expansion in the direction of the integral flow of the heat transport medium is at least four times as large as across the flow, the isolation and mechanical The support structure of the back of the collector consists of several parts, and the heat transport medium flows in metallic hollow bodies that weirs over re the rear insulation body consist of one piece. 2. Solar flat plate collector according to claim 1, characterized in that that the radiation side of the collector is covered with transparent plastic sheets which are sealed at the joint with an elastic profile ring. 3. Solar flat plate collector according to claim 1, characterized in that that the radiation side of the collector is covered with a plastic film is. 4. Solar flat plate collector according to claim 1 - 3, characterized in that that the heat transport medium flows in metallic tubes, which are covered with metal sheets, which absorb the incident radiation, are directly connected to metal or otherwise have good thermal contact with them. 5. Solar flat plate collector according to claim 1 - 4, characterized in that that the flow cross-section for the heat transport medium in the metallic nohl bodies in a section of the located on the outlet side of the heat transport medium Collector is enlarged by more than lo Z.