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HW6_2005 - Chemical Engineering Thermodynamics 141 Fall...

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Chemical Engineering Thermodynamics 141 Fall 2005 Homework 6 Due Friday 10/21 1. Your supervisor wants you to design a liquefaction process to liquefy N 2 gas from 300K, 200 atm to 98.69 K (saturation temperature) and 7 atm. The specific enthalpy of the saturated liquid and saturated vapor at 7 atm are: H l = 74.7 J/gm H v = 239.2 J/gm (a) Consider first using a throttle valve alone. Draw the path corresponding to the conditions given above on a T-S diagram. Based on your finding, is it possible to achieve liquefaction by a throttle valve alone? State and justify your reasoning. (b) Now consider combining a heat exchanger with the throttle valve. In particular, the gas cooled by throttling, but not liquefied, is used to cool the inlet gas before it enters the throttle valve. This is achieved in coutercurrent arrangement with the unliquefied gas leaving the heat exchanger at 290 K. Is it possible to achieve liquefaction? If so, what fraction of N 2 gas is liquefied in this process? Draw the process path on the T-S diagram. State and justify your reasoning.
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