Steam at 235°C is flowing inside a steel pipe(k = 61 W/m·K) whose inner and outer diameters are10 cm and 12 cm, respectively, in an environment at 20°C.The heat transfer coefficients inside and outside the pipeare 105 W/m2·K and 14 W/m2·K, respectively. Determine(a) the thickness of the insulation (k = 0.038 W/m·K) neededto reduce the heat loss by 95 percent and (b) the thickness ofthe insulation needed to reduce the exposed surface temperatureof insulated pipe to 40°C for safety reasons.
Steam at 235°C is flowing inside a steel pipe(k = 61 W/m·K) whose inner and outer diameters are10 cm and 12 cm, respectively, in an environment at 20°C.The heat transfer coefficients inside and outside the pipeare 105 W/m2·K and 14 W/m2·K, respectively. Determine(a) the thickness of the insulation (k = 0.038 W/m·K) neededto reduce the heat loss by 95 percent and (b) the thickness ofthe insulation needed to reduce the exposed surface temperatureof insulated pipe to 40°C for safety reasons.
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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Question
Steam at 235°C is flowing inside a steel pipe
(k = 61 W/m·K) whose inner and outer diameters are
10 cm and 12 cm, respectively, in an environment at 20°C.
The heat transfer coefficients inside and outside the pipe
are 105 W/m2·K and 14 W/m2·K, respectively. Determine
(a) the thickness of the insulation (k = 0.038 W/m·K) needed
to reduce the heat loss by 95 percent and (b) the thickness of
the insulation needed to reduce the exposed surface temperature
of insulated pipe to 40°C for safety reasons.
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