Comment on 'The effects of heat transfer on the exergy efficiency of an air-standard Otto cycle' by Hakan OEzcan, Heat and Mass Transfer (2011) 47:571-577

摘要

In this letter, it is shown that the applied relations in the paper by Hakan OEzcan [H. OEzcan, The effects of heat transfer on the exergy efficiency of an air-standard Otto cycle, Heat and Mass Transfer (2011) 47:571-577] are erroneous and thus the reported results are invalid. These incorrect relations [Eqs. (8), (9), (10), (14) and (16) of HOE2011] are replaced by correct ones. Moreover, the obtained results (graphs and tables) are modified based on the correct relations. Finally, to achieve more realistic results, the internal irreversibility described by using the compression and expansion efficiencies is added to the analysis.