Heat and Mass Transfer: Fundamentals and Applications
5th Edition
ISBN: 9780073398181
Author: Yunus A. Cengel Dr., Afshin J. Ghajar
Publisher: McGraw-Hill Education
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Chapter 3, Problem 193P
A 0.6-rn-diameter, 1.9-rn-long cylindrical tank containing liquefied natural gas (L.NG) at -160°C is placed at the center of a 1.9-m-long
If the outer surface temperature of the bar is 12°C. determine the rate of heat transfer to the tank. Also. determine the LNG temperature after one month. Take the density and the specific heat of LNG to be 425 kg/m3 and 3.475 kJ/kg°C. respectively.
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The boiling temp of nitrogen at 1 atm is -196°C. The temp of liquid
nitrogen in a tank open to the atmosphere at sea level will remain constant until it is depleted. Any heat
transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization
of 198 kJ/kg and a density of 810 kg/m² at 1 atm. Consider a 3-m-diameter spherical tank that is initially
filled with liquid nitrogen at 1 atm and -196°C. The tank is exposed to ambient air at 15°C, with a
convection heat transfer coefficient of 35 W/m?-K. The temperature of the thin-shelled spherical tank is
observed to be almost the same as the temperature of the nitrogen inside. Determine the rate of
evaporation of the liquid nitrogen in the tank as a result of heat transfer
N, vapor
from the ambient air if the tank is (a) not insulated, (b) insulated with 5-
T= 15°C
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Chapter 3 Solutions
Heat and Mass Transfer: Fundamentals and Applications
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