Category The Experimental Analyze Of The Solar Energy Collector
The design of the trestle aimed at the possibility of rotating the parabolic trough about a single axis automatically (east-west or north-south) and about the second axis manually. The possibility of the manual tracking allows the reduction of the IAM (incident angle modifier) by positioning the parabolic trough with the ideal angle to the sun, especially during the experimental phase.
As identifiable in Fig. 2, the trestle is built up of a frame base of square steel bars with the dimensions of 2 m x 2 m, which gives the construction the necessary stability. In the middle of the frame base, a vertical square bar is fixed. With a bearing at the top, the vertical square bar holds the carrier for the collector body...Read More
This model is based on a total of 210 outdoor stagnation experiments, which were carried out between 2003 and 2007 on three different collector types with a total of eight different connection variations (Fig. 1).
The SPP of a collector array depends on numerous parameters such as collector efficiency, system pressure and the piping of the collectors. During the stagnation process, we assume that the two – phase mixture in the collector array has the temperature of saturated steam $s. The theoretical collector performance during stagnation Pstag at the moment of maximum steam spread is calculated as follows:
Pstag = GT, stag -Л0 “ a1 (S. )“ a2 (®. “ )2
Pstag Theoretical collector performance during stagnation W/m2
GT, stag Effective irradiance...Read More
Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
Tel.: +49 7 61 / 45 88 – 54 09, Fax: +49 7 61 / 45 88 – 94 09
michael. hermann@,ise. fraunhofer. de
Aluminium becomes more and more interesting as a solar absorber material. One possibility to produce an absorber entirely made of aluminium is given by roll-bond technology which is well established for large-scale series production of e. g. evaporators for refrigerators. This technology offers the possibility to build solar absorbers with high efficiency, since the channel design can be varied without additional costs...Read More
MacGregor Solar, 31 Temple Village, Edinburgh, Scotland EH23 4SQ
tel +1875 830 271
* Corresponding Author: kerr @macgregorsolar. com
This paper describes a novel method of building large, cheap solar water heating collectors on site. It is based on using synthetic rubber pipes with enhanced thermal conductivity which are squeezed against the underside of an aluminium solar absorber sheet. The collector can easily be built on site using unskilled labour at a relatively low cost. In addition the collectors are freeze-tolerant and can handle corrosive fluids.
Several attempts have been made (Bartelsen et al, 1999) to use polymers pipes for solar heat collectors. However, these require specially formed absorber plates to encase the pipes...Read More