?Two schemes are proposed for the reduction in pressure of ethylene gas at 375 K and 18

Chapter 7, Problem 7.56

(choose chapter or problem)

Two schemes are proposed for the reduction in pressure of ethylene gas at 375 K and 18 bar to 1.2 bar in a steady-flow process:

(a) Pass it through a throttle valve.

(b) Send it through an adiabatic expander of 70% efficiency. For each proposal, determine the downstream temperature, and the rate of entropy generation in \(J \cdot mol^{−1} \cdot K^{−1}\). What is the power output for proposal (b) in \(kJ \cdot mol^{−1}\)? Discuss the pros and cons of the two proposals. Do not assume ideal gases.

Text Transcription:

J cdot mol^−1 cdot K^−1

kJ cdot ⋅mol^−1

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