Energy loss along a line.

15 June 2017 1 9K Report

An 8in schedule 40s line insulated with 1.5in calcium silicate conveys medium pressure steam at temperature of 400℃. The insulation was found broken at a portion 500mm along the run of the line. Calculate the energy loss around the failed portion if the skin temperature at the portion reads 335℃ at an ambient temperature of 32℃.

Leszek Malinowski

Q = πDLh(Twall - Tair)

h = kNu/D

Nu = C(GrPr)n

k - heat conductivity

h - heat transfer coefficient

h is in the order of 4-8 W/(m2K)

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