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An expander receives 1 lbm/s air at 300 psia, 540 R with an exit state of 60 psia, 540 R. Assume the process is reversible and isothermal. Find the rates of heat transfer and work neglecting kinetic and potential energy changes. 

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C.V. Expander, single steady flow.

Ideal gas and isothermal gives a change in entropy by, so we can solve for the heat transfer

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