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A boiler tube (OD = 3.5 in., ID = 2.7 in) contains water at 1250 psia (tsat = 572 0F). The water film coefficient is hi = 2000 Btu/hr.ft2.0F when the heat flux is 52000 Btu/hr.ft2 of the outside tube surface. Determine: (a) the outside tube temperature, (b) the permissible thickness of boiler scale if the metallic temperature is not to exceed 925 deg F. Thermal conductivities are: steel, k = 310 and for scale k = 3.5 Btu-in/hr.ft2.0F. Draw the diagram

A boiler tube (OD = 3.5 in., ID = 2.7 in) contains water at 1250 psia (tsat = 572 0F). The water film coefficient is hi = 2000 Btu/hr.ft2.0F when the heat flux is 52000 Btu/hr.ft2 of the outside tube surface. Determine: (a) the outside tube temperature, (b) the permissible thickness of boiler scale if the metallic temperature is not to exceed 925 deg F. Thermal conductivities are: steel, k = 310 and for scale k = 3.5 Btu-in/hr.ft2.0F. Draw the diagram

Elements Of Electromagnetics
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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A boiler tube (OD = 3.5 in., ID = 2.7 in) contains water at 1250 psia (tsat = 572 0F). The water film coefficient is hi = 2000 Btu/hr.ft2.0F when the heat flux is 52000 Btu/hr.ft2 of the outside tube surface. Determine: (a) the outside tube temperature, (b) the permissible thickness of boiler scale if the metallic temperature is not to exceed 925 deg F. Thermal conductivities are: steel, k = 310 and for scale k = 3.5 Btu-in/hr.ft2.0F. Draw the diagram

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