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, […]

The simulation measurements have been made in the days of the equinoxies and solstices, between the hours 6 AM and 6 PM. We used the following hypotheses for the simulation: the roof oriented South, у = 0; the inclination angle of the roof is equal with the latitude of the place, 5 = Ф = […]

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). ETC1a/b FPC2c The SPP of a collector array depends on numerous parameters such as collector efficiency, system pressure and the […]

In Fig. 1 the efficiency factor is plotted as a function of the absorber temperature for a collector without and with thermotropic overheating protection at a solar irradiation of 1200 W/m2 and ambient air temperatures of 0 and 30°C. The thermotropic layer exhibits a solar transmittance of 0.90 in clear state and of 0.10 in […]

M. Hermann Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, GermanyTel.: +49 7 61 / 45 88 – 54 09, Fax: +49 7 61 / 45 88 – 94 09michael. hermann@,ise. fraunhofer. de Abstract Aluminium becomes more and more interesting as a solar absorber material. One possibility to produce an absorber entirely made […]

Figure shows a summary of the work done to produce selective paint. It is possible to observe high solar absorption values, but undesirably also high thermal emissivity. The paints obtained until the moment are not selective. In the initial work with paints, the objective was to get good optical properties for paint with the organic […]

Kerr MacGregor* MacGregor Solar, 31 Temple Village, Edinburgh, Scotland EH23 4SQtel +1875 830 271 * Corresponding Author: kerr @macgregorsolar. com Abstract 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 […]

As shown in Fig. 6, an angle plate, bended as a sector of a circle, is screwed at the front side of the collector prototype. Over this guidance a chain with a tensioning mechanism is led, which can be driven by a step motor over a gearwheel. The step motor is placed together with the […]