Аннотация
In the domain of heat radiation, and particularly of solar energy
use, the notion of exergy (or alternatively entropy) of radiation
has given rise to a fairly abundant literature; unfortunately, incoherencies
and discrepancies between the various authors could lead to a complete
disuse of the notion in this context. The aim of this paper is to
contribute to a clarification of this issue. We propose here a derivation
of the exergy of radiation, based solely on classical thermodynamics
notions, making thus possible a ready check of the validity of the
results. Results are given first for the blackbody case, then extended
to a radiation with arbitrary spectrum. Finally, application of the
notion of radiation entropy to a few simple examples shows the consistency
of this notion with some well-known physical laws, and can even give
some insight into the real signification of these laws.
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