4. Steam enters a throttling valve (i.e. Joule-Thomson expansion) at 350 °C and 2 MPa, and leaves the valve at 300 °C and 0.1 MPa. The expansion is adiabatic and steady-state. The changes of kinetic energy and potential energy are negligible. (a) Use mass and energy balance equations to prove that this process is isenthalpic; ( (b) Calculate the entropy generation per unit mass of steam in the unit of kJ/(kg.K); Below are the steam data. You may not need all the data provided. T, °C P, MPa , m³/kg Û, kJ/kg Ĥ, kJ/kg S, kJ/(kg-K) 2859.8 3137.0 6.9563 2810.4 3074.3 8.2158 State Initial 350 Final 300 2.0 0.1 0.1386 2.639
4. Steam enters a throttling valve (i.e. Joule-Thomson expansion) at 350 °C and 2 MPa, and leaves the valve at 300 °C and 0.1 MPa. The expansion is adiabatic and steady-state. The changes of kinetic energy and potential energy are negligible. (a) Use mass and energy balance equations to prove that this process is isenthalpic; ( (b) Calculate the entropy generation per unit mass of steam in the unit of kJ/(kg.K); Below are the steam data. You may not need all the data provided. T, °C P, MPa , m³/kg Û, kJ/kg Ĥ, kJ/kg S, kJ/(kg-K) 2859.8 3137.0 6.9563 2810.4 3074.3 8.2158 State Initial 350 Final 300 2.0 0.1 0.1386 2.639
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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Transcribed Image Text:4. Steam enters a throttling valve (i.e. Joule-Thomson expansion) at 350 °C and 2 MPa, and leaves the
valve at 300 °C and 0.1 MPa. The expansion is adiabatic and steady-state. The changes of kinetic energy
and potential energy are negligible.
(a) Use mass and energy balance equations to prove that this process is isenthalpic; (
(b) Calculate the entropy generation per unit mass of steam in the unit of kJ/(kg-K);
Below are the steam data. You may not need all the data provided.
3
State T, °C P, MPa , m³/kg Û, kJ/kg Ĥ, kJ/kg S, kJ/(kg-K)
Initial 350
Final 300
2.0
0.1
0.1386
2.639
2859.8
2810.4
3137.0
3074.3
6.9563
8.2158
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