Question: An air standard cycle is executed in a closed system with 0.001 kg of air and is composed of the following three processes: (1) 1-2:

An air standard cycle is executed in a closed system with 0.001 kg of air and is composed of the following three processes: (1) 1-2: Isentropic compression from 110 kPa and 30oC to 1.1 MPa (2) 2-3: p = constant during heat addition in the amount of 1.73 kJ (3) 3-1: p = c1 v + c2 during heat rejection to initial state (c1 and c2 are constant)
(a) Calculate the heat rejected and
(b) Determine the thermal efficiency (ηth). Use the PG model.

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