The P-v diagram of an air-standard Ericsson cycle, shown in Fig. 9.43, operates with a minimum pressure

Question:

The P-v diagram of an air-standard Ericsson cycle, shown in Fig. 9.43, operates with a minimum pressure of 60 kPa and a maximum pressure of 780 kPa. Heat is rejected at a constant temperature of 400°C, and heat is added at 1200°C. Using constant specific heats for air, calculate
i) The thermal efficiency of the cycle,
ii) The net work,
iii) The heat addition,
iv) The heat rejection.
Figure 9.43