Abstract
Simple upper bound formulae for the efficiency of converting the energy of thermal radiation into mechanical work are derived. They are upper bounds as they refer to a large class of systems. They are simple as they are functions of two parameters only, namely the temperatures of the energy sources. The original contributions are as follow: (1) Two sorts of “cold” thermal reservoirs are considered. (2) An endoreversible thermal engine is used here to convert radiation energy into work. A number of existing theories are particular cases of the present approach.
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