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ECN publication
Outdoor performance of uncovered PV/thermal panels
Published by: Publication date:
ECN Energy in the Built Environment 1-6-2004
ECN report number: Document type:
ECN-RX--04-070 Conference Paper
Number of pages: Full text:
5 Download PDF  

Presented at: 19th European Photovoltaic Solar Energy Conference and Exhibition, Paris, France, 7-11 juni 2004.

A photovoltaic/thermal (PVT) panel is a combination of photovoltaic cells with a solar thermal collector, forming one device that converts solar radiation into electricity and heat simultaneously. In general, two types of PVT can be distinguished: glass-covered PVT collectors, which produce high-temperature heat but have a slightly lower electrical yield, and uncovered PVT panels, which produce relatively low-temperature heat but have a somewhat higher electrical performance. In this work, two prototypes of an uncovered PVT panel have been manufactured. Both the electrical and thermal performance of these prototypes have been measured: the former in a flash test measurement, the latter in an outdoor test setup. The electrical module efficiency of the prototypes has been found to be 11.2%, which is as expected. The thermal efficiency at zero reduced temperature has been found to be 77%, with a heat loss coefficient of 23 W/m2K. Both these numbers are higher than could be expected based on numerical modelling performed in earlier work. A more detailed comparison is necessary to explain this differences.

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