(1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k; = 45 W/m-K) has an inside diameter of Di,1 = 150 mm and wall thickness t; = 20mm while the outer steel pipe has an inside diameter of Di,2 = 250 mm and wall thickness t, = t;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.03 W/m-K) between the two pipes does not exceed its maximum service temperature of T, max = 70°C. The ocean water is at T, = -5°C and provides an external convection heat transfer coefficient of h, flowing crude oil is h; = 450 W/m2-K. 500 W/m2-K. The convection coefficient associated with the
(1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k; = 45 W/m-K) has an inside diameter of Di,1 = 150 mm and wall thickness t; = 20mm while the outer steel pipe has an inside diameter of Di,2 = 250 mm and wall thickness t, = t;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.03 W/m-K) between the two pipes does not exceed its maximum service temperature of T, max = 70°C. The ocean water is at T, = -5°C and provides an external convection heat transfer coefficient of h, flowing crude oil is h; = 450 W/m2-K. 500 W/m2-K. The convection coefficient associated with the
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.3DP
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