Modeling and Simulation of Solar Systems Employing Collectors with Colored Absorber
Date Issued
June 2004
Abstract
To avoid the monotony of the black colored flat plate solar
collectors we can use absorbers of blue, red-brown, green or other color. Because
of the lower collector absorptance these collectors have lower thermal efficiency
than that of the usual black type collectors, they are however of more interest to
architects for applications on traditional or modern buildings. In this paper
applications of solar collectors with colored absorbers are presented and analyzed
with respect to their performance, aiming to give guidelines for their wider use on
buildings. These systems are simulated with TRNSYS on an annual basis at two
different locations, Nicosia, Cyprus and Athens, Greece. The results show that the
energy output depends on the absorber darkness. For a medium value of the
coefficient of absorptance, the colored collectors give satisfactory results with
respect to the drop of the amount of collected energy, compared to collectors with
black absorbers. This implies the use of slightly larger collector aperture area to
have the same energy output as that of typical black colored collectors.
collectors we can use absorbers of blue, red-brown, green or other color. Because
of the lower collector absorptance these collectors have lower thermal efficiency
than that of the usual black type collectors, they are however of more interest to
architects for applications on traditional or modern buildings. In this paper
applications of solar collectors with colored absorbers are presented and analyzed
with respect to their performance, aiming to give guidelines for their wider use on
buildings. These systems are simulated with TRNSYS on an annual basis at two
different locations, Nicosia, Cyprus and Athens, Greece. The results show that the
energy output depends on the absorber darkness. For a medium value of the
coefficient of absorptance, the colored collectors give satisfactory results with
respect to the drop of the amount of collected energy, compared to collectors with
black absorbers. This implies the use of slightly larger collector aperture area to
have the same energy output as that of typical black colored collectors.
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