Improving the Accuracy in Performance Prediction for New Collector Designs

Kovács, Peter, Pettersson, Ulrik, Perers, Bengt, Fischer, Stephan, Persson, Martin

ISES Solar World Congress 2011 · Kassel, Germany · 2011-08-28
Published by International Solar Energy Society (ISES)
DOI: 10.18086/swc.2011.28.14

Abstract

The European standard for solar collector testing (EN 12975-2:2006) offers two different methods for characterizing the thermal performance of solar thermal collectors: The steady state method (SS) and the quasi dynamic method (QDT). The first one originates from the Ashrae 93-77 and ISO 9806 standards where the performance model parameters are determined under clear sky conditions (maximum 20 % diffuse fraction allowed, however EN 12975 states maximum 30 %) and at high irradiance levels (minimum 800 W/m2, EN 12975 states 700 W/m2). The QDT method was developed and introduced in the EN standard in 2001, as the EN 12975 was first published. Compared to the SS method, the QDT method offers the following main advantages:

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