An ideal gas is contained in a piston-cylinder device andundergoes a power cycle as follows: 1-2 isentropic compression froman initial temperature T1 5 208C with a compression ratio r 5 5 2-3constant pressure heat addition 3-1 constant volume heat rejectionThe gas has constant specific heats with cv 5 0.7 kJ/kg·K and R 50.3 kJ/kg·K. (a) Sketch the P-v and T-s diagrams for the cycle. (b)Determine the heat and work interactions for each pro- cess, inkJ/kg. (c) Determine the cycle thermal efficiency. (d) Obtain theexpression for the cycle thermal efficiency as a function of thecompression ratio r and ratio of specific heats k.
