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

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 2RQ: The three materials of which condensers are normally made are _____, and ____.

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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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