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PROBLEM No.48: A Carnot power cycle employing 1lb of air as a working substance operates between temperature limits of 600F and 70F. The pressure at the beginning and end of isothermal heat addition process are 510psia and 170 psia, respectively. Determine: A. The difference in volume between the end of isentropic expansion and isentropic compression (ft3/lb.) ANS: 12.3 ft3/lb B. The heat supplied to the system; the heat rejected by the system. ANS: 79.9 C. The network of the cycle, (BTU/lb.) ANS: 39.9 BTU/lb D. The cycle thermal efficiency, (%) ANS: 50%