Liquid helium and liquid nitrogen are both used as coolants; He(e) boils at 4.21 K, and N2(e) boils at 77.35 K. The specific heat of liquid helium near its boiling point is 4.25 J K-1g-1, and the specific heat of liquid nitrogen nearits boiling point is 1.95 J K-1g-1. The enthalpy of vaporization of He(e) is 25.1 J g-1, and the enthalpy of vaporization of N2(e) is 200.3 J g-1(these data are calculated from the values in Appendix F). Discuss which liquid is thebetter coolant (on a per-gram basis) near its boiling point and which is better at its boiling point.
Liquid helium and liquid nitrogen are both used as coolants; He(e) boils at 4.21 K, and N2(e) boils at 77.35 K. The specific heat of liquid helium near its boiling point is 4.25 J K-1g-1, and the specific heat of liquid nitrogen nearits boiling point is 1.95 J K-1g-1. The enthalpy of vaporization of He(e) is 25.1 J g-1, and the enthalpy of vaporization of N2(e) is 200.3 J g-1(these data are calculated from the values in Appendix F). Discuss which liquid is thebetter coolant (on a per-gram basis) near its boiling point and which is better at its boiling point.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Liquid helium and liquid nitrogen are both used as coolants; He(e) boils at 4.21 K, and N2(e) boils at 77.35 K. The specific heat of liquid helium near its boiling point is 4.25 J K-1g-1, and the specific heat of liquid nitrogen near
its boiling point is 1.95 J K-1g-1. The enthalpy of vaporization of He(e) is 25.1 J g-1, and the enthalpy of vaporization of N2(e) is 200.3 J g-1(these data are calculated from the values in Appendix F). Discuss which liquid is the
better coolant (on a per-gram basis) near its boiling point and which is better at its boiling point.
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