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)
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)
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)
Transcribed Image Text:Heat Exchanger
4
1
2
Throttle Valve
Liquid Nitrogen
3
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