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 3 - Properties of Pure Substances - Problems - Page 154: 3-41

Answer

$T_{1}=0.605^{\circ}C$ $H_{1}=545kJ$ $T_{2}=21.55^{\circ}C$ $H_{2}=846.4kJ$

Work Step by Step

$\upsilon=\frac{V}{m}=\frac{14L*\frac{1m^3}{1000L}}{10kg}=0.0014\frac{m^3}{kg}$ 1) As $0.0007734\frac{m^3}{kg}\lt \upsilon\lt 0.0680575\frac{m^3}{kg}$ is a saturated mixture. From table A-12: $T_{1}=0.605^{\circ}C$ $x_{1}=\frac{\upsilon-\upsilon_{f,1}}{\upsilon_{g,1}-\upsilon_{f,1}}=\frac{0.0014\frac{m^3}{kg}-0.0007734\frac{m^3}{kg}}{0.0680575\frac{m^3}{kg}-0.0007734\frac{m^3}{kg}}=0.009313$ $h_{1}=h_{f,1}+x_{1}h_{fg,1}=52.65\frac{kJ}{kg}+0.009313*198.195\frac{kJ}{kg}=54.50\frac{kJ}{kg}$ $H_{1}=mh_{1}=10kg*54.50\frac{kJ}{kg}=545kJ$ 2) As $0.0008198\frac{m^3}{kg}\lt \upsilon\lt 0.034335\frac{m^3}{kg}$ is a saturated mixture. From table A-12: $T_{2}=21.55^{\circ}C$ $x_{2}=\frac{\upsilon-\upsilon_{f,2}}{\upsilon_{g,2}-\upsilon_{f,2}}=\frac{0.0014\frac{m^3}{kg}-0.0008198\frac{m^3}{kg}}{0.034335\frac{m^3}{kg}-0.0008198\frac{m^3}{kg}}=0.017312$ $h_{2}=h_{f,2}+x_{2}h_{fg,2}=81.50\frac{kJ}{kg}+0.017312*180.95\frac{kJ}{kg}=84.63\frac{kJ}{kg}$ $H_{2}=mh_{2}=10kg*84.63\frac{kJ}{kg}=846.4kJ$
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