For the conditions given in part B of Problem 7.112, calculate the heat added, the heat rejected, and the net work performed (all per unit mass of steam).

Problem 7.112

Consider a steady-flow ideal Carnot cycle, using steam as the working fluid, in which the high-temperature, constant-pressure heat-addition process starts with a saturated liquid and ends with a saturated vapor. 

A. Plot this cycle in T–s coordinates showing the steam dome.

B. Calculate the thermal efficiency for this cycle if the pressure of the high temperature steam is 6 MPa and the low-temperature heat-rejection process occurs at 300 K. Calculate the values of the quality at the beginning and end of the heat-rejection process.

C. Explain why it is difficult to operate a practical steam power plant on the ideal Carnot cycle of part A.