Underdamped stochastic heat engine at maximum efficiency
Abstract
We investigate the performance of an underdamped stochastic heat engine, using the paradigmatic model of a harmonic oscillator with timedependent frequency. We analytically determine the optimal protocol that maximizes the efficiency at fixed power. The maximum efficiency reduces to the CurzonAhlborn formula at maximum power and to the Carnot formula at zero power. We establish that the efficiency at maximum power is universally given by the CurzonAhlborn efficiency for weak damping. We further show that even small deviations from operation at maximum power results in a significantly increased efficiency.
 Publication:

EPL (Europhysics Letters)
 Pub Date:
 September 2017
 DOI:
 10.1209/02955075/119/50003
 arXiv:
 arXiv:1602.00392
 Bibcode:
 2017EL....11950003D
 Keywords:

 Condensed Matter  Statistical Mechanics
 EPrint:
 6 pages, 3 figures