To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from aproduction field.(1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube isused to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D₁, 1 =150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of D₁,2 = 250 mm and wall thicknessto = 1;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k = 0.055 W/m-K)between the two pipes does not exceed its maximum service temperature of 7p,max = 70°C. The ocean water is at T, = -5°C andprovides an external convection heat transfer coefficient of h, = 500 W/m²K. The convection coefficient associated with the flowingcrude oil is h; = 450 W/m².K.(2) It is proposed to enhance the performance of the pipe-in-pipe device by replacing a thin (= 10 mm) section of polyurethanelocated at the outside of the inner pipe with an aerogel insulation material (k = 0.012 W/m-K). Determine the maximum allowablecrude oil temperature to ensure maximum polyurethane temperatures are below Tp. max = 70°C. Determine the convection heat transfer resistance on the inside of the pipe per unit length, in m-K/W.RLconv.iSave for LaterUsing multiple attempts will impact your score.20% score reduction after attempt 1Step 2m.K/WDetermine the conduction resistance of the polyurethane per unit length without the aerogel, in m-K/W.R't,cond.p =Step 3m-K/WSave for LaterUsing multiple attempts will impact your score.20% score reduction after attempt 1Attempts: 0 of 3 usedSave for LaterUsing multiple attempts will impact your score.Determine the conduction resistance of the polyurethane per unit length when aerogel is used, in m-K/W.Rº 1,cond.p.acm-K/WAttempts: 0 of 3 used Submit AnswerSubmit AnswerAttempts: 0 of 3 usedSubmit Answer

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To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (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 ; = 20 mm while the outer steel pipe has an inside diameter of D₁,2 = 250 mm and wall thickness to = t;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.055 W/m-K) between the two pipes does not exceed its maximum service temperature of Tp. max = 70°C. The ocean water is at T, = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m²-K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m².K.

To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (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 ; = 20 mm while the outer steel pipe has an inside diameter of D₁,2 = 250 mm and wall thickness to = t;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.055 W/m-K) between the two pipes does not exceed its maximum service temperature of Tp. max = 70°C. The ocean water is at T, = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m²-K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m².K.

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.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.28P

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