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 5 - Mass and Energy Analysis of Control Volumes - Problems - Page 267: 5-155E

Answer

a) $\dot{Q}=44,800\ Btu/h$ b) $\dot{V}=232,500 ft^3/h$

Work Step by Step

For the eggs: $\dot{m}=10,000\ eggs/h \times 0.14\ lbm/egg=1400\ lbm/h=0.3889\ lbm/s$ $\dot{m}h_1=\dot{m}h_2+\dot{Q}$ $\dot{Q}=\dot{m}c_p(T_1-T_2)$ Given $c_p=0.80\ Btu/lbm.°F,\ T_1=90°F,\ T_2=50°F$ $\dot{Q}=44,800\ Btu/h$ For the air: $\dot{Q}=\dot{m}c_p\Delta T$ $c_p=0.24\ Btu/lbm.°F,\ \Delta T=10°F$ $\dot{m}=18,667\ lbm/h$ $\dot{m}=\frac{P\dot{V}}{RT}$ $P=14.7\ psia,\ R=0.3704\ psia.ft³/lbm.°R,\ T=494°R$ $\dot{V}=232,500 ft^3/h$
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