# Stratification is the formation

Jun 29th, 2015
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Southern Wesleyan University
Course: general
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A 4-m diameter spherical tank filled with liquid nitrogen at 1 atm and -196*C is exposed to convection with ambient air. The rate of evaporation of liquid nitrogen in the tank as a result of the heat transfer from the ambient air is to be determined.

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1-87E A 200-ft long section of a steam pipe passes through an open space at a specified temperature. The rate of heat loss from the steam pipe and the annual cost of this energy lost are to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat transfer by radiation is disregarded. 3 The convection heat transfer coefficient is constant and uniform over the surface. Analysis (a) The rate of heat loss from the steam pipe is (b) The amount of heat loss per year isThe amount of gas consumption per year in the furnace that has an efficiency of 86% isThen the annual cost of the energy lost becomes1-88 A 4-m diameter spherical tank filled with liquid nitrogen at 1 atm and -196C is exposed to convection with ambient air. The rate of evaporation of liquid nitrogen in the tank as a result of the heat transfer from the ambient air is to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat transfer by radiation is disregarded. 3 The convection heat transfer coefficient is constant and uniform over the surface. 4 The temperature of the thin-shelled spherical tank is nearly equal to the temperature of the nitrogen inside.Properties The heat of vaporization and density of liquid nitrogen at 1 atm are given to be 198 kJ/kg and 810 kg/m3, respectively. Analysis The rate of heat transfer to the nitrogen tank is Then the rate of evaporation of liquid nitrogen in the tank is determined to be1-89 A 4-m diameter sp

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