DE2832304A1 - Plastic solar heat collector - with black extruded multi-web panel covered by transparent web panel - Google Patents

Abstract

A solar heat collector includes an extrudedmultiweb platic panel with two black parallel panes joined by parallel webs to form rectangular ducts. The ducts are joined at their open ends by plastic tubes to which the panels are welded. Another plastic panel which is transparent is join with its parallel webs to the first. The transparent panes and webs are shorter in the direction of the webs than the black plastic parts and form cavities of air which are not included in the liquid flow system. Such solar heat collectors are made at low cost in extruders and can be completed without much labour. The energy losses towards the outer surfaces are minimised.

Description

Plastic solar collector

The present invention relates to a plastic solar collector.

There are already known solar collectors of various types. They are used to utilize solar energy by heating a flow medium, preferably water.

In a known embodiment is in one through a translucent Plate arrangement covered housing a metal plate arranged on the sunny side, the the inclusion of. Sun rays and conversion of these rays into thermal energy serves. On the metal plate is a metal tube construction to dissipate the thermal energy arranged from the plate in a consumer pipe system. The metal pipe construction is on the by means of a copper connection soldered in an inert atmosphere Metal plate attached. This type of fastening is not only intended to be durable mechanical connection, it is also a very good thermal conduction medium, which is a fast and Low-loss transfer of thermal energy from the metal plate guaranteed in the flow medium serving to remove the thermal energy.

It is also known an embodiment in which the metal plate profiled in relief on the same size base to enlarge their surface is.

Using these constructions of solar panels will be in the first place the aim is to use as much of the incident radiation energy as possible in as little space as possible to convert it into thermal energy with as little loss as possible. It will also be a very good one Effect achieved. Nevertheless, the known solar collectors described above have has not yet achieved the desired distribution.

The main reason for this can be seen in particular in that these constructions are very complex and expensive to manufacture. About that In addition, their relatively high weight requires very stable supporting structures.

To avoid these disadvantages, one already has solar panels made of plastic. The most important component is a so-called multi-skin sheet, which simultaneously converts solar rays into thermal energy and transfers it the thermal energy in a flow medium, preferably water, is used, which in a consumer pipe system circulates.

The web plate is a one-piece extruded one Plate made of black colored plastic, with the two lying parallel to each other Plate layers arranged parallel to one another perpendicular between the plates Bridges are interconnected. The resulting between the plates and the webs Cavities form, in cross-section, four-cornered tubular chambers that extend from a Extend the plate edge continuously to the opposite plate edge. The two Plate edges that run perpendicular to these chambers, which are open here, are respectively edged in by a tube cut in the longitudinal direction to a self-contained chamber system, which via the pipe ends into a pipeline system can be installed.

Such solar panels made of plastic in the form of a so-called Multi-wall sheets have the great advantage that they can be produced by means of a plastic extruder and can be completed without great effort. But you also have that Disadvantage that because of the significantly lower thermal conductivity compared to metal of plastic, the effectiveness of such solar collectors is considerably lower is.

The present invention is therefore based on the object To create a solar collector, which on the one hand is cheap to manufacture, but on the other hand is more effective than the known plastic solar collectors. It is particularly desirable to design the energy converter so that the previously unavoidable energy losses through heat dissipation to the outer surface as possible are low.

To solve this problem, the invention is based on a solar collector made of plastic, the main component of which is made of black colored Plastic is one-piece extruded so-called web plate, with two parallel mutually lying plate layers by parallel to each other perpendicular between the plates arranged webs are connected to one another and wherein the right-angled Plate edges of tubes cut open in the longitudinal direction, which run towards the webs are bordered.

The object is achieved according to the invention in that the Collector has the following features: a) The multi-walled sheet is designed as a multi-walled sheet designed in such a way that over the two black-colored plate layers at least Another plate layer made of clear plastic is arranged, which is also connected in one piece to the outer, black-colored plate layer by means of webs is; b) the crystal clear plate layers or plate layer and which they with the outer (3er black colored plate layer connecting Bridges are shorter in the direction of the webs than the black-colored plate part and not framed by the tubes, those with the black framed plate part of the web plate form a self-contained system of chambers.

The distances between the black-colored plate part and the plate part made of clear plastic located webs from each other be larger than the distances within the black-colored part of the plate.

Another feature of the invention may be that on the made of clear plastic plate part protruding vertically upwards are arranged.

The invention is illustrated by way of example Drawing explained in more detail. They show: FIG. 1 a vertical longitudinal section and FIG Fig. 2 is a vertical cross section through the subject of the application.

The most essential part of the solar collector according to the invention is a multi-wall sheet. It exists in the exemplary embodiment described here consists of three layers arranged one above the other and is made in one piece by means of an extruder made of thermoplastic material.

The two lower plate layers 1, 2 are colored black.

They are through parallel to each other and perpendicular to the plate layers standing webs 3 interconnected so that the space between the plate layers 1, 2 is divided into tubular chambers 3a with a square cross-section. the At right angles to the webs 3 extending edges of these two plate layers 1, 2 are bordered by tubes 4, 5 cut open in the longitudinal direction, which with the Plate layers 1, 2 are glued, so that of the chambers 3a and the tubes 4, 5 a communicating coherent tube system is formed.

Above that formed from the plate layers 1, 2 and the webs 3 The black-colored part of the multi-wall sheet is another sheet layer 6 arranged, which, however, consists of a crystal clear plastic, which with the plastic of the black-colored part 1, 2, 3 can be fused and has a high resistance to light having. This crystal-clear plate layer 6 is made of the same plastic by webs 7 with the upper plate layer 2 of the black-colored part of the multi-wall plate tied together. However, it is not enclosed by the tubes 4, 5.

The black colored part 1, 2, 3 of the multilayer plate is that part of the solar collector that converts the sun's rays into thermal energy and serves to transfer the thermal energy to a flow medium, e.g. water. The crystal-clear part 6, 7 forms a thermal insulation layer made of air chambers that dissipate heat largely restricted to the outside air.

The application of the inventive concept is not to that described here Embodiment limited. The multiple web plate can also be several on top of each other have arranged plate layers made of clear plastic. This will make the heat insulating effect increased.

The upper crystal-clear plate layer 6 can also be used vertically be provided protruding webs on which a window glass pane as a cover of the collector is arranged.

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Claims (3)

PATENT CLAIMS Solar collector made of plastic, its most essential Part of a so-called multi-wall sheet extruded from black colored plastic is, where two plates lying parallel to one another are perpendicular through parallel to one another webs arranged between the plates are connected to one another and wherein the Plate edges that are perpendicular to the webs and are cut open in the longitudinal direction Pipes are bordered, characterized in that the collector following features comprises: a) The multi-wall plate is designed as a multi-wall plate in such a way that that over the two black-colored plate layers (1, 2) at least one another plate layer (6) made of clear plastic is arranged, which is supported by webs (7) is integrally connected to the outer black-colored layer (2); b) the crystal-clear plate layers or plate layer (6) and which they with the outer black-colored plate layer (2) connecting webs (7) are in the direction the webs (7) shorter than the black-colored part (1, 2, 3) of the web plate and not bordered by the tubes (4, 5) with the part colored in black (1, 2, 3) of the web plate form a closed chamber system. t. Solar collector according to claim 1, characterized in that the Distances between the black-colored plate part (1, 2, 3) and the plate part 5, 7) made of clear plastic webs are larger from each other than the spacing between the bars within the black-colored plate part (1, 2, 3). 3. Solar collector according to claim 1, characterized in that on the plate part (6, 7) made of clear plastic vertically upwards protruding webs are arranged.