Heat Flow and Efficiency in a Microscopic Engine

Details Heat Flow and Efficiency in a Microscopic Engine Heat Flow and Efficiency in a Microscopic Engine

2005-04-18

arxiv.org/abs/physics/0504118v1

Physics

Biological Physics

16 pages, 14 figures

Scientific paper

10.1140/epjb/e2005-00383-0

We study the energestics of a thermal motor driven by temperature differences, which consists of Brownian particles moving in a sawtooth potential with an external load where the viscous medium is alternately in contact with hot and cold heat reservoir. The motor can work as a heat engine or a refrigerator under different conditions. The heat flow via both potential and kinetic energy are considered. The former is reversible when the engine works quasistatically and the latter is always irreversible. The efficiency of the heat engine (Coefficient Of Performance (COP) of a refrigerator) can never approach Carnot efficiency (COP).

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