A heat engine cycle is executed with ammonia in the saturation dome. The pressure of ammonia is

Question:

A heat engine cycle is executed with ammonia in the saturation dome. The pressure of ammonia is 1.5 MPa during heat addition and 0.6 MPa during heat rejection. What is the highest possible thermal efficiency? Based on the temperatures of heat addition and rejection, could you comment on possible application of such a low-efficiency cycle?