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.

Outdoor measurements of flat-plate solar collectors in Western Germany show that American test instructions are not applicable and suggest improvements for outdoor measurements in Western Europe.

COMPARATIVE OUTDOOR MEASUREMENTS ON FLAT-PLATE SOLAR COLLECTORS IN A METROPOLITAN AREA IN WESTERN GERMANY

Key Takeaway: Outdoor measurements of flat-plate solar collectors in Western Germany show that American test instructions are not applicable and suggest improvements for outdoor measurements in Western Europe.