Example 2.22: A steel pipe 25 mm internal diameter and 33 mm outer diameter and insulated with rockwool carries steam at 451 K (178°C). If the surrounding air temperature is 294 K (21°C), calculate the rate of heat loss from one metre length of pipe. The thickness of insulation is 38 mm. Thermal conductivities of steel and rockwool are 44.97 W/(mK) and 0.175 W/(m-K) respectively. The inside and outside heat transfer coefficients are 5678 W/(m²K) and 11.36 W/(m²K) respectively. Contact resistance between the pipe and insulation may be neglected.
Example 2.22: A steel pipe 25 mm internal diameter and 33 mm outer diameter and insulated with rockwool carries steam at 451 K (178°C). If the surrounding air temperature is 294 K (21°C), calculate the rate of heat loss from one metre length of pipe. The thickness of insulation is 38 mm. Thermal conductivities of steel and rockwool are 44.97 W/(mK) and 0.175 W/(m-K) respectively. The inside and outside heat transfer coefficients are 5678 W/(m²K) and 11.36 W/(m²K) respectively. Contact resistance between the pipe and insulation may be neglected.
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 7.48P
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ANS :
Q=114.93W/m
![Example 2.22: A steel pipe 25 mm internal diameter and 33 mm outer diameter and
insulated with rockwool carries steam at 451 K (178°C). If the surrounding air temperature is
294 K (21°C), calculate the rate of heat loss from one metre length of pipe. The thickness of
insulation is 38 mm. Thermal conductivities of steel and rockwool are 44.97 W/(m.K) and
0.175 W/(m-K) respectively. The inside and outside heat transfer coefficients are 5678 W/(m²K)
and 11.36 W/(m²K) respectively. Contact resistance between the pipe and insulation may be
neglected.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7c9d4b26-51cd-4b32-bb0b-3a6cba185fe5%2Fa32c21fc-2fa8-4f61-b1df-03caed963892%2Foktbg4j_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Example 2.22: A steel pipe 25 mm internal diameter and 33 mm outer diameter and
insulated with rockwool carries steam at 451 K (178°C). If the surrounding air temperature is
294 K (21°C), calculate the rate of heat loss from one metre length of pipe. The thickness of
insulation is 38 mm. Thermal conductivities of steel and rockwool are 44.97 W/(m.K) and
0.175 W/(m-K) respectively. The inside and outside heat transfer coefficients are 5678 W/(m²K)
and 11.36 W/(m²K) respectively. Contact resistance between the pipe and insulation may be
neglected.
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