1212.6875 (Shiqi Sheng et al.)
Shiqi Sheng, Z. C. Tu
It is found that the coefficient of performance at maximum figure of merit for tight-coupling refrigerators operating between two heat baths at small temperature difference is inversely proportional to the square root of relative temperature difference. This universal 1/2-power law is quite different from the universality of efficiency at maximum power which is one half of the relative temperature difference for tight-coupling heat engines working between two baths at small temperature difference.
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http://arxiv.org/abs/1212.6875
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