Thermal Losses in Sealed, Gas-filled Flat Plate Solar Collectors
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2007

A sealed space between absorber and cover glass makes it possible reducing the influence of humidity condensate and dust at the same time as the enclosed space can be filled with a suitable gas for lowering the losses. This paper is about the size of the losses in these collectors. A calculating model of a gas-filled flat plate solar collector was built in Matlab with standard heat transfer formulas. It showed that the total loss can be reduced up to 20% when changing to an inert gas. It is also possible using a much shorter distance and still achieve low losses at the same time as the mechanical stresses in the material is reduced.



Johan Vestlund

Chalmers, Energi och miljö, Installationsteknik

Jan-Olof Dalenbäck

Chalmers, Energi och miljö, Installationsteknik

Mats Rönnelid

ISES Solar World Congress 2007 Proceedings


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