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Solar collector cover with temperature-controlled solar light transmittance

 
: Muehling, O.; Seeboth, A.; Ruhmann, R.; Eberhardt, V.; Byker, H.; Anderson, C.D.; Jong, S. de

:

Häberle, A.:
SHC 2013, 2nd International Conference on Solar Heating and Cooling for Buildings and Industry : September 23-25, 2013, Freiburg, Germany
Amsterdam: Elsevier, 2014 (Energy Procedia 48)
S.163-171
International Conference on Solar Heating and Cooling for Buildings and Industry (SHC) <2, 2013, Freiburg>
Englisch
Zeitschriftenaufsatz, Konferenzbeitrag
Fraunhofer IAP ()

Abstract
Our aim is the development of a solar collector cover with temperature-controlled solar light transmittance in order to protect plastic solar collectors against overheating and to prevent collector damage during stagnation. The temperature-dependent reduction of solar transmittance is based on an increase of backscattering of the incident solar radiation (thermotropism). The thermotropic materials consist of two components: 1) a thermotropic additive, namely submicron-sized core-shell particles containing a phase-change material, and 2) an appropriate transparent matrix polymer. Thermotropic samples based on three different matrix polymers (UV-curable cast resin, EVA and PVB) were prepared as sandwich laminates according to industrially relevant processes. Temperature-dependent measurements of the total solar transmittance reveal absolute differences of up to 28 % between OFF and ON state.

: http://publica.fraunhofer.de/dokumente/N-286034.html