A spherical tank (OD-3 m, k-19 W/mK, p=4050 kg/m³, cp-4810 J/kg.K) contains a liquefied-petroleum gas as shown in figure

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A Spherical Tank Od 3 M K 19 W Mk P 4050 Kg M Cp 4810 J Kg K Contains A Liquefied Petroleum Gas As Shown In Figure 1 (32.98 KiB) Viewed 17 times

A spherical tank (OD-3 m, k-19 W/mK, p=4050 kg/m³, cp-4810 J/kg.K) contains a liquefied-petroleum gas as shown in figure below. The tank is exposed to air at a pressure of 2 KN/m² and at a temperature of 20°C. If the outer temperature of the tank is -60°C, determine the following: a) The heat lost or gain. [3] A 250 mm thickness of insulation (k-0.06 W/m.K) is applied to the tank to reduce the heat gain. Ignoring the effect of insulation on the heat transfer coefficient (ho), determine: b) The % reduction in heat transfer rate. [3] c) The outer temperature of the insulation. [2] d) Obtain a general relation for the temperature distribution inside the insulation under steady state conditions. Determine the temperature at an insulation thickness of 150 mm. (4) e) How long time will it take for the tank wall temperature (no insulation case) to increase from-60 to 0 °C [3] 1) Is heat transfer rate increased, decreased or unchanged by adding insulation? Explain your answer based on critical radius of insulation [1] Outer surface of the tank, T-60C Outer surface of the tank, Ti-60°C T₂-7 Alt, 20 ANH S Insulation, 0.06 W/mK -1.5m 250 mm No insulation with insulation Available data: Properties of air at 1 atm and Tf :p-1.394 kg/m³, cp-1.005 kJ/kg.Ku-163-107 Pas, k-0.02211 W/m.K, Npr=0.7408 [Detail steps are required here. Quick answers are not acceptable]