Maximum reversible work extraction from a blackbody radiation reservoir. A way to closing the old controversy
Candida Oancea Institute, Polytechnic University of Bucharest - Spl. Independentei 313, Bucharest 060042, Romania and Academia Romana - Calea Victorie 125, Bucharest, Romania
Received: 1 December 2014
Accepted: 7 February 2015
The old controversy concerning the correctness of Petela-Landsberg-Press and Carnot formulas for the efficiency of reversible work extraction from a blackbody radiation reservoir is solved. Both formulas are correct. They are particular cases of a more general formula involving the geometric factor of the radiation reservoir. The maximum work rate density obtained from a reservoir associated with Carnot efficiency may be higher, or lower, than that obtained from a radiation reservoir of similar temperature associated with lower reversible conversion efficiency, depending on the ambient temperature.
PACS: 05.70.Ce – Thermodynamic functions and equations of state / 84.60.-h – Direct energy conversion and storage / 88.05.De – Thermodynamic constraints on energy production
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