In nonideal thermodynamic engines the efficiency is well below the Carnot efficiency In 1975 an expression for the efficiency of a nonideal Carnot engine with heat losses was derived, yielding at maximum power output. In this paper, a corresponding relation is obtained for more general nonideal Carnot engines. If there are friction losses only, the result is If friction and heat losses are both included, the efficiency at maximum power depends on a dimensionless parameter that takes into account the effects of friction and heat conduction, and can vary between the values obtained for friction and heat losses separately, A general relation between efficiency and power output is established, and it is shown that an appreciable gain in efficiency can be obtained at a power output only slightly below its maximum.
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PAPERS| November 01 2002
Efficiency of nonideal Carnot engines with friction and heat losses
E. Rebhan; Efficiency of nonideal Carnot engines with friction and heat losses. Am. J. Phys. 1 November 2002; 70 (11): 1143–1149. https://doi.org/10.1119/1.1501116
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