Power, Efficiency, Entropy Generation Rate and Ecological Optimization of an Irreversible Otto Cycle with Variable Specific Heats
Hemant B. Mehtaa and Omprakash S. Bhartib
Mechanical Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat 395 007, Gujarat, India.
ahbm@med.svnit.ac.in
bomprakash.bharti2006@gmail.com
ABSTRACT
In this paper, performance of an air standard irreversible Otto-cycle is analyzed using finite-time thermodynamics (FTT). In the irreversible cycle model, the friction loss computed according to the mean velocity of the piston, the internal irreversibility described by using the compression and expansion efficiencies, the heat-transfer loss and the heat leak rate between the two reservoirs are considered. The relations between the power output and the compression ratio, between the thermal efficiency and the compression ratio, the optimal relation between the net power output and the efficiency of the cycle, Ecological function and power output, net heat input and efficiency, as well as power loss due to entropy generation rate and efficiency are indicated by numerical example.
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