Testing of solar air collectors
Christoph Thoma, Thorsten Weick, Jens Richter, Thorsten Siems, Matthias Rommel Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstrahe 2, D-79110 FreiburgCorresponding Author, christoph. thoma@ise. fraunhofer. de Abstract Solar air collectors …
Test System Components
According to the standard ISO 9459-2, test procedures for characterizing the performance of solar domestic water heating systems operated without auxiliary boosting are established. A “black box” approach is adopted …
The number of householders in buildings
In Portugal 1/5 of buildings are occupied during only a part of the year [4]. Many cases of emigrant people and second house for holidays are example of this. In …
Power calculations based on available test methodologies
Collector instantaneous efficiency n is defined as a ratio between the useful heat Q delivered and the hemispherical irradiance Gcol on the collector aperture Aa, according to (Rabl, 1985): The …
Tube radius
Calculations with different glass tube radius are carried out. Other parameters are here changed as well: For the collectors with the curved absorbers, the glass tube centre distance and the …
Collector tests according to ISO 9806 / EN 12975
In order to determine the efficiency parameters of solar thermal collectors according to ISO 9806 or EN 12975, two different procedures can be used: the steady state test method and …
Case — studies
1.1. Case-study buildings Two case study buildings were considered. Case-study 1 is a T1 apartment (with one bedroom) located in the ground floor of a 6-floor apartment building [4]. The …
Solar Keymark Certification
In order to remove trade barriers inside Europe and to support the establishment of a uniform European market the European standardisation bodies CEN and CENELEC[4] created a uniform methodology for …
Stability of Absorber and Mirror Coatings
Modern selective absorber coatings usually are thin layer systems on metal substrates which selectively absorb short wavelength photons - a process which is enhanced by multiple scattering at small metal …
Application of the different test methods
A CPC collector having an aperture area of 1.87 m2 was analysed. The collector uses a circular absorber tube with an outer diameter of 19 mm. With an aperture width …
Improved new testing possibilities for air-collectors
As explained in the abstract, Fraunhofer ISE has already operated a test facility for solar air collectors for some years. We have now started to extent and improve our testing …
