Abstract
In this paper we apply variational calculus procedures for the optimization of a Curzon-Ahlborn thermal cycle under the so-called modified ecologicalcriterion. Our result for the optimum efficiency is the same that Velasco et al (2000 J. Phys. D 33 355)previously obtained by means of the method of the saving functions.Besides, we show that both the saving functions and the modified ecologicalcriteria are equivalent.
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