(Solution) - An air standard cycle is executed in a closed system -(2025 Original AI-Free Solution)

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An air standard cycle is executed in a closed system and is composed of the following four processes: (1) 1-2: Isentropic compression from 110 kPa and 30oC to 900 kPa, (2) 2-3: p = constant during heat addition in the amount of 3000 kJ/kg, (3) 3-4: v = constant during heat rejection to 110 kPa, (4) 4-1: p = constant during heat rejection to initial state.
(a) Calculate the maximum temperature in the cycle and
(b) Determine the thermal efficiency (?th). Use the PG model.