Consider a Joule-Thomson expansion (throttling) process. A gas at T, P flows in a well- insulated...
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Consider a Joule-Thomson expansion (throttling) process. A gas at T₁, P₁ flows in a well- insulated pipe and pass through a valve, with the gas coming out at T2, P2. (a) Show that in this process the enthalpy of the gas is kept as constant. (b) The Joule-Thomson coefficient can be expressed as μ = (3). Derive an expression H of u in terms of measureable properties. (c) Based on the above results, can you find out whether T₂ will be higher, or lower, than T₁? (Hint: depending on the EOS) (d) A non-ideal gas at 25°C is to be cooled by Joule-Thomson throttling to -80°C. The final pressure is 1 atm. What initial pressure is required to achieve the desired cooling? Thermodynamic properties of the gas are: Specific heat when this gas is an ideal gas (in the limit of P=0): Cp = 6.2 +0.01 T, with units Cp [=] cal/gmole K, T[=] K Equation of state in term of the compressibility fact 2 x 105 cm³ PV Z = = 1+ RT BP RT B[=] T[=] K T gmole where B = 30- - Consider a Joule-Thomson expansion (throttling) process. A gas at T₁, P₁ flows in a well- insulated pipe and pass through a valve, with the gas coming out at T2, P2. (a) Show that in this process the enthalpy of the gas is kept as constant. (b) The Joule-Thomson coefficient can be expressed as μ = (3). Derive an expression H of u in terms of measureable properties. (c) Based on the above results, can you find out whether T₂ will be higher, or lower, than T₁? (Hint: depending on the EOS) (d) A non-ideal gas at 25°C is to be cooled by Joule-Thomson throttling to -80°C. The final pressure is 1 atm. What initial pressure is required to achieve the desired cooling? Thermodynamic properties of the gas are: Specific heat when this gas is an ideal gas (in the limit of P=0): Cp = 6.2 +0.01 T, with units Cp [=] cal/gmole K, T[=] K Equation of state in term of the compressibility fact 2 x 105 cm³ PV Z = = 1+ RT BP RT B[=] T[=] K T gmole where B = 30- -
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a soring a throttling process a change in temperature a series of experiments takes place ... View the full answer
Related Book For
Introduction to Chemical Engineering Thermodynamics
ISBN: 978-0071247085
7th edition
Authors: J. M. Smith, H. C. Van Ness, M. M. Abbott
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