Thermodynamics: An Engineering Approach 8th Edition

Published by McGraw-Hill Education
ISBN 10: 0-07339-817-9
ISBN 13: 978-0-07339-817-4

Chapter 7 - Entropy - Problems - Page 399: 7-40

Answer

$q=-130.2\ kJ/kg$ $w=-40.6\ kJ/kg$

Work Step by Step

Initial ($P_1=320\ kPa, T_1=40°C$): $u_1=261.62\ kJ/kg,\ s_1=1.0452\ kJ/kg.K$ Final ($x_2=0.45, T_2=40°C$): $u_2=172.02\ kJ/kg,\ s_2=0.62920\ kJ/kg.K$ $q=T(s_2-s_1),\ T=313\ K$ $q=-130.2\ kJ/kg$ $q-w=\Delta u$ $w=-40.6\ kJ/kg$
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