Thermal Losses in Sealed, Gas-filled Flat Plate Solar Collectors
Conference contribution, 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.