-4 Determine the optimum thickness from an economic point of view, of insulation for a steam pipe 100 mm dia. at 465°C. The insulation conductivity is 1.55 x 10 kW/mK, the natural convection coefficient on the insulation outer surface is 0.0112 kW/m2K, the insulation cost is £70/m³ plus a fixed charge of 160p. per metre run of pipe and the cost is to be spread over 5 yer ts. The oil fuel, of density 900 kg/m³, costs 1.lp. per litre and is used to raise steam in a boiler of 90% efficiency. The fuel calorific value is 41,000 kJ/Kg and the air temperature surrounding the insulation is 27°c.
-4 Determine the optimum thickness from an economic point of view, of insulation for a steam pipe 100 mm dia. at 465°C. The insulation conductivity is 1.55 x 10 kW/mK, the natural convection coefficient on the insulation outer surface is 0.0112 kW/m2K, the insulation cost is £70/m³ plus a fixed charge of 160p. per metre run of pipe and the cost is to be spread over 5 yer ts. The oil fuel, of density 900 kg/m³, costs 1.lp. per litre and is used to raise steam in a boiler of 90% efficiency. The fuel calorific value is 41,000 kJ/Kg and the air temperature surrounding the insulation is 27°c.
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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Transcribed Image Text:Determine the optimum thickness from an economic point of view, of
insulation for a steam pipe 100 mm dia. at 465°C. The insulation
conductivity is 1.55 x 10 kW/mK, the natural convection coefficient
-4
on the insulation outer surface is 0.0112 kW/m2K, the insulation cost
is £70/m³ plus a fixed charge of 160p. per metre run of pipe and the
cost is to be spread over 5 veres. The oil fuel, of density 900 kg/m³,
costs 1.lp. per litre and is used to raise steam in a boiler of 90%
efficiency. The fuel calorific value is 41,000 kJ/Kg and the air
temperature surrounding the insulation is 27°c.
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