The exact differential equation of enthalpy can be expressed as below: dH=-uCpdp + CdT where C: constant pressure heat capacity u: Joule-Thomson coefficient μl= H a) Derive the exact differential equation of enthalpy from the general exact differential equation of enthalpy: dp + (7) dr T dH= Р b) Considering that you use nitrogen gas to make a temperature drop to an isenthalpic system, how much pressure drop is required to cool the system by 20 K? The Joule-Thomson coefficient of nitrogen is µ = 0.27 K atm¹. c) Prove that the Joule-Thomson expansion can occur without change of enthalpy (isenthalpic process).
The exact differential equation of enthalpy can be expressed as below: dH=-uCpdp + CdT where C: constant pressure heat capacity u: Joule-Thomson coefficient μl= H a) Derive the exact differential equation of enthalpy from the general exact differential equation of enthalpy: dp + (7) dr T dH= Р b) Considering that you use nitrogen gas to make a temperature drop to an isenthalpic system, how much pressure drop is required to cool the system by 20 K? The Joule-Thomson coefficient of nitrogen is µ = 0.27 K atm¹. c) Prove that the Joule-Thomson expansion can occur without change of enthalpy (isenthalpic process).
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter5: Analysis Of Convection Heat Transfer
Section: Chapter Questions
Problem 5.12P
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