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A PVT collector concept with variable film insulation and low-emissivity coating

: Lämmle, M.; Thoma, C.; Hermann, M.

Postprint urn:nbn:de:0011-n-4110644 (410 KByte PDF)
MD5 Fingerprint: ef688320849ba5ed29460a8e35553181
Created on: 7.10.2016

Fulltext (PDF; )

Energy Procedia 91 (2016), pp.72-77
ISSN: 1876-6102
International Conference on Solar Heating and Cooling for Buildings and Industry (SHC) <4, 2015, Istanbul>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer ISE ()
Solarthermie und Optik; Photovoltaische Module und Kraftwerke; Solarthermie; Modultechnologie; Thermische Solaranlagen; Wärmeübertragung und Wärmetransport; insulation; photovoltaic-thermal (PVT) collector; protection; thermal

Hybrid photovoltaic-thermal (PVT) collectors co-generate solar electricity and heat in a single component with an optimum utilization of space. Spectrally selective but transparent low-emissivity (low-e) coatings are a proven method to reduce thermal losses. However, overheating and stagnation are critical issues for these collectors due to material degradation, thermal stress, and low electrical efficiency.
This paper presents a PVT collector concept with variable film insulation as overheating protection. An inflatable glass-film cushion regulates thermal losses. Performance and stagnation tests were carried out with a prototype. During normal operation the collector achieves a high thermal efficiency. In periods of standstill, the deflated cushion has a high heat dissipation rate by deactivating the low-e coating. Stagnation temperatures are thus limited to 95 ̊C. To conclude, the PVT collector combines the advantages of glazed and unglazed PVT collectors which are a high thermal efficiency and low stagnation temperatures.