In a pharmaceutical plant, a copper pipe (kc= 400 W/m-K) with innerdiameter of 20 mm and wall thickness of 0.07 m is used for carrying liquidoxygen to a storage tank. The liquid oxygen flowing in the pipe has anaverage temperature of -200°C and a convection heat transfer coefficient of120 W/m2.K. The condition surrounding the pipe has an ambient airtemperature of 20°C and a combined heat transfer coefficient of 20 W/m2.K.If the dew point is 10°C, determine the thickness of the insulation (k;= 0.05W/m-K) around the copper pipe to avoid condensation on the outer surface.Assume thermal contact resistance is negligible.Liq. O2, –200°Ch= 120 W/m²-K´- Pipe, k̟ = 400 W/m-KInsulationk; = 0.05 W/m-KSurrounding air, 20°Cheombined = 20 W/m² KDew point = 10°CD2D3The thickness of the insulation ism.

GivenD1=20mmt=0.07m=70mmD2=70+70=140mmTi=-200°C=-200+273=73kT∞=20°C=20+273=293K

Answered: In a pharmaceutical plant, a copper…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Q- For fully developed flow through a pipe, the wall temperature is maintained at 500°C. If the fluid has thermal conductivity of 0.12 W/m-K and diameter of pipe is 15 cm, then the heat transfer coefficient (in W/m²K) will be
Consider the composite wall below. The inner side of the wall is subjected to air flow at 430°C with a heat transfer coefficient of 25 W/m² C and the outter side is subjected to air flow at 55°C with heat transfer coefficient of 10 W/m²-C. If KA 150 W/m-C, Kg = 30 W/m-C, Kc = 65 W/m-C, and Kp = 50 W/m-C, and assuming one dimensional heat flow. Find the rate of heat transfer across the wall. Q Inner 10 cm 3 cm B C 8 cm Outer side D 5 cm 3 cm 7 cm
A wall with a brick and concrete layer is shown in the figure. The wall has a length of 15 m and 6 m high. The brick (k = 1.3 W/m-K) has a thickness of 75 mm and the concrete (k = 2 W/m-K) is 150 mm thick. Determine the total heat resistance, the heat transfer rate through the wall, and the temperature of its inner surface for a day during which the room is maintained at 20°C while the temperature of the outdoors is 32°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the wall to be 12 W/m2-K and 18 W/m2-K, respectively, which includes the effects of radiation. Round off your final answer to three (3) decimal places.
A 12cm outside diameter and 10cm inside diameter cast iron pipe with conductivity of 80W/m-K has 4 cm of polystyrene insulation with conductivity of 0.027W/m-K. Saturated steam at 500degC is flowing through pipe and the outside surface temperature is 60degC. Determine the temperature of the outside surface of the pipe.
An industrial freezer is designed to operate with an internal air temperature of -20°C when the external air temperature is 27°C, and the internal and external heattransfer coefficients are 8 W/m2 -K and 12 W/m2 -K, respectively. The walls of thefreezer are composite construction, comprising an inner layer of plastic (k = 0.33 W/m-K, and thickness of 10 mm), and an outer layer of stainless steel (k = 15 W/m-K, and thickness of 3 mm). Sandwiched between these two layers is a layer of insulation material with k = 0.07 W/m-K. Find the width (mm) of the insulation thatis required to reduce the convective heat loss to 60 W/m2.
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