Q. A heat engine cycle is executed with steam in the saturation dome. The pressure of steam is 1 MPa during heat addition and 0.5 MPa during heat rejection. THe highest possible efficiency of the heat engine is. How to calculate heat efficiency? W = QH / COP,hp and COP = 1 / ( TH /TL - 1 ) Pl. note COP- denotes the coefficient of performance of the heat engine. Any ideas on how to proceed? Thanks, a lot!