Entropy Generation Minimisation of Imaging Concentrating Solar Collectors
Date Issued
June 2003
Author(s)
Abstract
There are three types of imaging concentrating solar collectors, the parabolic trough, the
parabolic dish and the central receiver. The second law of thermodynamics is used to analyze the
potential for entropy generation minimization of imaging concentrating solar collectors. It is shown that
the amount of exergy (useful energy) delivered by solar concentrating collector systems is affected by
heat transfer irreversibilities occurring between the sun and the collector, between the collector and
ambient air and within the collector receiver (absorber). Analysis is performed and relations are derived
in this paper by considering both, an isothermal and a non-isothermal collector which is a more realistic
model particularly for the long parabolic trough collectors. Relations for the optimum operating
conditions, in terms of the optimum collector outlet temperature for minimum heat transfer irreversibility
or entropy generation minimization (or maximum exergy delivery), are derived. The importance of
operating at the optimum delivery temperature is analyzed and optimum values of entropy generated are
derived for the collector types considered.
parabolic dish and the central receiver. The second law of thermodynamics is used to analyze the
potential for entropy generation minimization of imaging concentrating solar collectors. It is shown that
the amount of exergy (useful energy) delivered by solar concentrating collector systems is affected by
heat transfer irreversibilities occurring between the sun and the collector, between the collector and
ambient air and within the collector receiver (absorber). Analysis is performed and relations are derived
in this paper by considering both, an isothermal and a non-isothermal collector which is a more realistic
model particularly for the long parabolic trough collectors. Relations for the optimum operating
conditions, in terms of the optimum collector outlet temperature for minimum heat transfer irreversibility
or entropy generation minimization (or maximum exergy delivery), are derived. The importance of
operating at the optimum delivery temperature is analyzed and optimum values of entropy generated are
derived for the collector types considered.
Subjects
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