Answered: A process to liquify nitrogen gas (N2)…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A process to liquify nitrogen gas (N2) from 300K, 200atm to 98.69K (saturation
temperature) and 7atm is to be designed. The specific enthalpy of the saturated liquid and
saturated vapor at 7atm are, Hl = 74.7 J/g and Hv = 239.2 J/g respectively.

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 the arrangement with the unliqufied gas leaving the heat exchanger at 290K
(stream5.) Stream 4 is still at Tsat and 7atm. Is it possible to achieve liquefaction? If so, what
fraction of N2 gas is liquefied in this process? (Hint: try combining mass and energy balances on
the overall process)

Heat Exchanger
4
1
2
Throttle Valve
Liquid Nitrogen
3

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