ISES 2009 - Design of a MaReCo Collector for High Solar Fraction

摘要

Regardless of what are the efforts concerning solar collector development, one of the most important goals is the system solar fraction increase. In this study, irradiation adapted solar collectors were used to increase the annual energy production in order to end up with a high solar fraction. The MaReCo is a non tracking CPC-collector designed to be integrated into a roof. It consists of reflector, absorber and support structure. The tilt of the collector decides how large fraction of the annual irradiation is kept inside the acceptance interval. Collector measurements were carried out and fed into a TRNSYS simulation software where the solar fraction of domestic hot water systems was calculated. A traditional flat-plate collector and a MaReCo system were studied. For each tilt, the collector areas of the two systems were selected for achieving the highest solar fraction but limiting the collector overproduction. Due to the reflector, the MaReCo and the flat-plate collector have different performance for different tilt angles. The results show that, for tilt angles in the interval of 35° and 65°, the MaReCo system achieves higher solar fractions than the traditional flat-plate collector but requires larger collector areas. With the appropriate tilt and control, the MaReCo collector system has higher solar fraction and can be a very competitive solution if produced in a cheap way.