WO2009143833A2

WO2009143833A2 - Solar collector

Info

Publication number: WO2009143833A2
Application number: PCT/DE2009/000752
Authority: WO
Inventors: Sigurd Wenzler; Bernd Hafner
Original assignee: Viessmann Werke Gmbh & Co. Kg
Priority date: 2008-05-30
Filing date: 2009-05-29
Publication date: 2009-12-03
Also published as: EP2300754A2; DE102008026073A1; WO2009143833A3

Abstract

The invention relates to a solar collector for converting solar radiation into heat, comprising a housing (1) having a cover (2) transparent to solar radiation, wherein a solar radiation absorber (3) is disposed in the housing (1) behind the cover (2) and a thermal insulation (4) is disposed behind said absorber. According to the invention, the heat insulation (4) is at least partially curved and bounds at least one hollow space (5) for receiving a gaseous medium, preferably air, due to the curvature.

Description

solar panel

The invention relates to a solar collector according to the preamble of patent claim 1.

A solar collector for the conversion of solar radiation into heat of the type mentioned is manufactured and sold by the applicant under the product name VITOSOL® 300-F (see also Figure 1). Such a solar collector consists of a housing which is provided with a solar radiation permeable cover or cover plate, wherein in the housing behind the cover plate, a solar radiation absorber and behind this is arranged a consisting of melamine resin foam thermal insulation.

A similarly constructed solar collector is known from DE 20 2005 005 631 U1, although there are no further details on thermal insulation disclosed.

With respect to the insulating material "melamine resin foam" is on a so-called air collector revealing DE 33 11 152 Al noted, in which the black-colored foam, however, does not form the heat insulation, but the absorber itself.

The invention has for its object to reduce the material required for the production of a solar collector of the type mentioned material.

BESTATIGUNGSKOPIE This object is achieved with a solar collector of the type mentioned by the features listed in the characterizing part of patent claim 1.

According to the invention, it is thus provided that the heat insulation is formed, in particular on the surface side, at least partially curved and, owing to curvature, limits at least one cavity for receiving a gaseous medium, preferably air.

In other words, according to the invention, it is provided that the thermal insulation is no longer completely parallelepiped-shaped, but rather a particularly corrugated insulation body must be provided, whose outer dimensions are identical to the original insulation body but whose surface is provided with exceptions or cavities, for example in waveform are. Although the thermal insulation according to the invention thereby becomes a geometrically significantly complicated body, thanks to the cavities enclosing in particular air, the insulating effect is at least as good, and that although substantially less melamine resin foam or the like is required for the entire body.

With regard to the required material savings, it should be noted that the thermal insulation made of melamine resin foam is typically cut out of a solid block with a wire cutter. Due to the said and preferred waveform, it is possible to cut significantly more insulation body from a given total block, without any waste.

Further advantages of the solar collector according to the invention will be apparent from the dependent claims. For the sake of completeness, reference is made to DE 30 27 996 A1. The there disclosed, consisting of an elastic foam insulation body is also formed wavy on one side. However, in this solution, the plate forming the absorber is formed wavy, that is, this insulation body does not have the cavity according to the invention for air, which also results from the fact that the insulation body on the housing side (bottom side) is planar and not wavy.

With reference to the aforementioned DE 20 2005 005 631 Ul it should also be noted that there the heat insulation is shown in the form of a wavy line. But this is simply the typical representation of an insulation and has nothing to do with the fact that the heat insulation is indeed wavy, which also results from the fact that typically rock wool mats are used, which (of course, because of a lack of support) not wavy in the housing of the Solar panel to be inserted. But also the inventively provided, preferably made of melamine resin foam thermal insulation can not be simply wavy inserted into the housing because of their corresponding stiffness.

The solar collector according to the invention including its advantageous developments according to the dependent claims will be explained in more detail with reference to the drawing representation of preferred embodiments.

It shows

1 shows in section the solar collector VITOSOL® 300-F according to the known prior art; - A -

Figure 2 in section the solar collector according to the invention with a first embodiment of the thermal insulation;

FIG. 3 shows in perspective a second embodiment of the thermal insulation according to the invention;

FIG. 4 is a plan view of the thermal insulation according to FIG. 3; and

FIG. 5 shows a side view of the thermal insulation according to FIGS. 3 and 4.

The solar collector shown in Figures 1 and 2 for converting solar radiation into heat in a known manner, first of all from a housing 1, which is provided with a solar radiation permeable cover 2, wherein in the housing 1 behind the cover 2, a solar radiation absorber 3 and behind this one Heat insulation 4 is arranged. Furthermore, a copper pipe 6 is heat-insulated on the solar radiation absorber 3 (soldered), through which a liquid heat transfer medium flows to remove the absorbed heat. Furthermore, the housing 1 is provided at the edge with an edge insulation 7.

With reference to FIG. 2, which shows the solar collector according to the invention, it is essential for the invention that the thermal insulation 4, preferably made of foam, in particular melamine resin foam, serving as radiation protection is at least partially curved or serrated and thus (ie due to the curvature) at least one cavity 5 for receiving a gaseous medium, preferably air, limited. In particular, it is provided with reference to FIGS. 3 to 5 that the thermal insulation 4 is plate-shaped (similar to a mattress) with at least one-sided, preferably double-sided, waveform this waveform may be jagged (see Figure 2), but also rounded (see Figure 3 and 5) may be.

Finally, it is provided that the heat insulation 4 is formed as a Teilkor.pus cut out of an overall carcass with respect to a low-loss production as possible, wherein the partial carcasses are preferably formed positively to one another.

(20 669)

LIST OF REFERENCE NUMBERS

1 housing

2 cover

3 solar radiation absorbers

4 heat insulation

5 cavity

6 copper pipe

7 edge isolation

Claims

(20 669) claims

1. A solar collector for converting solar radiation into heat, comprising a housing (1) which is provided with a solar radiation permeable cover (2), wherein in the housing (1) behind the cover (2) a solar radiation absorber (3) and behind this a thermal insulation (4) is arranged, characterized in that the heat insulation (4) is at least partially curved and due to the curvature of at least one cavity (5) for receiving a gaseous medium, preferably air, limited.

2. Solar collector according to claim 1, characterized in that the thermal insulation (4) is formed of melamine resin foam.

3. Solar collector according to claim 1 or 2, characterized in that the heat insulation (4) is plate-shaped with at least one-sided waveform.

4. Solar collector according to one of claims 1 to 3, characterized in that the thermal insulation (4) is formed as a carcass cut out of an overall body.

5. Solar collector according to claim 4, since you r c h ge kenn z e i c hne t that the sub-bodies are förmmschlüssig each other.