# Question: air with a mass of 1 lb undergoes a thermodynamic...

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Air with a mass of 1 lb undergoes a thermodynamic cycle consisting of three processes. Beginning from an initial state where the pressure P1 = 20 lbf/in2 , the volume V1 = 9.26 ft3 , and the specific internal energy u1 = 82.5 Btu/lb, the processes are as follows: Process 1 – 2: constant volume to P2 = 32.8 lbf/in2 and u2 = 140.5 Btu/lb, Process 2 – 3: adiabatic expansion with PV = constant, and Process 3 – 1: constant pressure compression back to the initial state.

Assuming no changes in kinetic and potential energy,

(a) Show the cycle on a P-V diagram

(b) Determine the heat transfer for the process from 1 to 2,

(c) Determine the work done the process from 2 to 3, and

(d) Determine the total heat transfer for the cycle.