Explanation Given information: Boiling temperature of nitrogen at 1 atm is -196°C. Heat of vaporization of liquid nitrogen h f g = 198 k J / k g Density of liquid nitrogen at 1 atm is 810 k g / m 3 Diameter of the spherical tank: d = 4 m Temperature of surrounding air: T ∞ = 20 ∘ C Heat transfer coefficient: h = 25 W / m 2 . K Temperature of the surface of spherical tank is considered to be same as that of nitrogen inside i.e. -196°C. Calculations: First determine the rate of heat transfer from the spherical tank: Q = h A s ( T s − T ∞ ) w h e r e , A s = 4 π r 2 = π d 2 A s = π ( 4 ) 2 = 50

Heat and Mass Transfer: Fundamentals and Applications

6th Edition

ISBN: 9781260440058

Author: CENGEL, Yunus

Publisher: MCGRAW-HILL HIGHER EDUCATION

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Chapter 1, Problem 73P

To determine

The rate of evaporation of the liquid nitrogen in the tank.

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Chapter 1, Problem 72EP

Chapter 1, Problem 74P

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Heat and Mass Transfer: Fundamentals and Applications

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