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Journal of Non-Equilibrium Thermodynamics

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Volume 43, Issue 4


Upper Bounds for the Conversion Efficiency of Diluted Blackbody Radiation Energy into Work

Viorel Badescu
  • Corresponding author
  • Candida Oancea Institute, Polytechnic University of Bucharest, Spl. Independentei 313, Bucharest 060042, Romania
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Published Online: 2018-04-19 | DOI: https://doi.org/10.1515/jnet-2018-0004


A new formula has been proposed for the Landsberg–Tonge function χ(ε) entering the entropy density flux of the diluted blackbody radiation of dilution factor ε. Two models have been proposed for the conversion of diluted blackbody radiation energy into work. The Carnot and Petela–Landsberg–Press relationships do not provide accurate upper bounds for the real conversion efficiency and in some cases they wrongly estimate positive output work when the converter of radiation energy into work does not operate. Four upper bounds for the conversion efficiency have been derived. The most accurate upper bound efficiency requires the numerical solution of an algebraic equation for the optimum absorber temperature while the second best upper bound efficiency has the advantage that it is a simple analytical formula.

Keywords: diluted blackbody radiation; selective absorbers; upper bound conversion efficiency


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About the article

Received: 2018-02-07

Revised: 2018-03-12

Accepted: 2018-04-03

Published Online: 2018-04-19

Published in Print: 2018-10-25

Citation Information: Journal of Non-Equilibrium Thermodynamics, Volume 43, Issue 4, Pages 273–287, ISSN (Online) 1437-4358, ISSN (Print) 0340-0204, DOI: https://doi.org/10.1515/jnet-2018-0004.

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