1. Steam at 235 °C is flowing inside a steel pipe (k = 61 W/m-°C) 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-°C and 14 W/m2-°C, respectively. Determine: (a) the thickness of insulation (k = 0.038 W/m-°C) needed to reduce the heat loss by 95 per cent and, (b) the thickness of the insulation needed to reduce the exposed surface temperature of insulated pipe to 40°C for safety reasons.
1. Steam at 235 °C is flowing inside a steel pipe (k = 61 W/m-°C) 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-°C and 14 W/m2-°C, respectively. Determine: (a) the thickness of insulation (k = 0.038 W/m-°C) needed to reduce the heat loss by 95 per cent and, (b) the thickness of the insulation needed to reduce the exposed surface temperature of 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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1. Steam at 235 °C is flowing inside a steel pipe (k = 61 W/m-°C) 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-°C and 14 W/m2-°C, respectively. Determine:
(a) the thickness of insulation (k = 0.038 W/m-°C) needed to reduce the heat loss by 95 per cent and,
(b) the thickness of the insulation needed to reduce the exposed surface temperature of insulated pipe to 40°C for safety reasons.
Transcribed Image Text:1. Steam at 235 °C is flowing inside a steel pipe (k = 61 W/m-°C) 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-°C and 14 W/m2-°C, respectively. Determine:
(a) the thickness of insulation (k = 0.038 W/m-°C) needed to reduce the
heat loss by 95 per cent 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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