The purpose of this paper is to research an irreversible Diesel cycle by using entransy approach. Entransy may be expressed as heat transfer potential of a subject and it has begun to investigate as a new thermodynamic assessment parameter. Optimization of heat transfer processes is very important, because of their extensity. Result of optimizing heat transfer is to use energy efficiently and decrease CO2 emission that is main reason of the global warming. Because of the these reasons, entransy analysis of a Diesel cycle is investigated and result are presented. Some obtained results for entransy analysis are: entransy efficiency has minimum (0.191) at x = 19.296, has a maximum (1.538x106 kW K) at x = 8.316 for ηE = ηC = 1. cycle and has a maximum point at x = 6.959 and it value is 1.341x106 kW K for ηE = ηC = 0.8.
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