W. Schwaigerer, E. Hahne
Journal name not available for this finding
Measurements on the efficiency of two flat-plate collectors under outdoor conditions and performed simultaneously are reported. The registered data are: quantity and fluctuation of insolation, incident angle and fluctuations of water outlet temperature. Test procedure and data were compared to American test instructions. The applicability of these instructions for outdoor measurements in Western Europe was critically examined and proposals for improvement are given.