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 416: 7-212

Answer

$\dot{S}_{gen}=0.016\ W/K$ $\dot{S}_{left}=0.378\ W/K$ $\dot{S}_{right}=0.394\ W/K$

Work Step by Step

From the entropy balance: $\dfrac{\dot{Q_i}}{T_i}-\dfrac{\dot{Q}_e}{T_e}+\dot{S}_{gen}=0$ Given $T_e=279\ K,\ T_i=291\ K,\ \dot{Q}_i=\dot{Q}_e=110\ W$ $\dot{S}_{gen}=0.016\ W/K$ For the glasses: $\dot{S}_{left}=\dot{S}_{i}=0.378\ W/K$ $\dot{S}_{right}=\dot{S}_{e}=0.394\ W/K$
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