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KNOWN: Initial overall heat transfer coefficient of a fire-tube boiler. Fouling factors following one year's application. FIND: Whether cleaning should be scheduled. SCHEMATIC: Boiling water Products of combustion -R=0.0015 m² K/W + -R₁ = 0.0005 m²-K/W U(+=0)=400W/m²-K ASSUMPTIONS: (1) Negligible tube wall conduction resistance, (2) Negligible changes in hc and hh-

KNOWN: Initial overall heat transfer coefficient of a fire-tube boiler. Fouling factors following one year's application. FIND: Whether cleaning should be scheduled. SCHEMATIC: Boiling water Products of combustion -R=0.0015 m² K/W + -R₁ = 0.0005 m²-K/W U(+=0)=400W/m²-K ASSUMPTIONS: (1) Negligible tube wall conduction resistance, (2) Negligible changes in hc and hh-

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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KNOWN: Initial overall heat transfer coefficient of a fire-tube boiler. Fouling factors following one year's application. FIND: Whether cleaning should be scheduled. SCHEMATIC: Boiling water Products of combustion -R=0.0015 m² K/W + -R₁ = 0.0005 m²-K/W U(+=0)=400W/m²-K ASSUMPTIONS: (1) Negligible tube wall conduction resistance, (2) Negligible changes in hc and hh-
Transcribed Image Text:KNOWN: Initial overall heat transfer coefficient of a fire-tube boiler. Fouling factors following one year's application. FIND: Whether cleaning should be scheduled. SCHEMATIC: Boiling water Products of combustion -R=0.0015 m² K/W + -R₁ = 0.0005 m²-K/W U(+=0)=400W/m²-K ASSUMPTIONS: (1) Negligible tube wall conduction resistance, (2) Negligible changes in hc and hh-
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