Irreversibility of three basic-type flow heat exchangers of counter-flow, cocounter-flow and cross-flow was discussed on the basis of the Second Law. A new concept called entropy generation effectiveness (EGE) which is same as heat transfer effectiveness is advanced, and the irreversibility of heat exchanger is evaluated by using EGE. Because of entropy generation number (EGN) and EGE as a function of enter temperature rate (θ) , number of heat transfer units (NTU) , and heat density rate of the fluid (C) for the three basic types of heat exch...
