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2016
Journal Article
Titel

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

Abstract
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.
Author(s)
Lämmle, M.
Thoma, C.
Hermann, M.
Zeitschrift
Energy Procedia
Konferenz
International Conference on Solar Heating and Cooling for Buildings and Industry (SHC) 2015
DOI
10.1016/j.egypro.2016.06.174
File(s)
N-411064.pdf (410.5 KB)
Externer Link
Externer Link
Language
English
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Fraunhofer-Institut für Solare Energiesysteme ISE
Tags
  • Solarthermie und Opti...

  • Photovoltaische Modul...

  • Solarthermie

  • Modultechnologie

  • Thermische Solaranlag...

  • Wärmeübertragung und ...

  • insulation

  • photovoltaic-thermal ...

  • protection

  • thermal

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