3473-11 HW 3 - CHE 3473 Chemical Engineering Thermodynamics...

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1 of 4 CHE 3473 Chemical Engineering Thermodynamics Fall 2011 Homework #3 Due: Wednesday, 9/14/2011 Eight problems (three points each), 24 points total. The pressure of an ethane stream is increased from 30 to 245 psia using a two-stage compressor with a water-cooled intercooler and aftercooler as indicated in the figure below. Answer the following questions using the attached GPSA P-H diagram for ethane. Assume the heat capacity of water is constant, C p = 1.0 Btu/lbm °F. Thee two compressor stages and heat exchangers are perfectly insulated. Ethane does NOT exhibit ideal gas behavior in this application. 1) The term “adiabatic efficiency” is commonly used in industry to quantify the performance of compressors. The choice of wording is awkward, as the actual reference or benchmark that is used is an isentropic (adiabatic, reversible) compression path rather than an adiabatic (no heat transfer) compression path as implied by the term. If the “adiabatic efficiency” of each compressor stage is 70 %, what is the actual outlet temperature (°F) from stages 1 and 2?
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This note was uploaded on 10/11/2011 for the course CHE 3473 taught by Professor Staff during the Spring '08 term at Oklahoma State.

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3473-11 HW 3 - CHE 3473 Chemical Engineering Thermodynamics...

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