8/12/2019 Heat Conduction Pipe Insulation

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Spreadsheet Problem Solving for ChE Faculty

Heat Loss from a Pipe

Basic Data Heat Transfer Calculations

Nominal Pipe Size 2 inches Surface Temperature Estimate

Pipe Outside Diameter 2.38 inches 125.0 degFDo 0.0605 m TsEst 51.7 degC

Fluid Temperature 300 degF Surface Heat Transfer CoefficientTf 148.9 degC DeltaT 30.6 degC

hs 12.1 W/(m 2*degC) Ambient Temperature 70 degF 2.12 BTU/(hr*ft 2*degF)

Ta 21.1 degC Heat Lossq 99.4 W/m

Insulation Thickness 0.5 inches 31.5 BTU/(hr*ft)0.0127 m

Outside Diameter 3.38 inches Surface Temperature CheckDs 0.0859 m Ts 51.7 degC

125.0 degFInsulation Thermal Conductivity

0.033 BTU/(hr*ft*degF)k 0.0571 W/(m*degC)

T F

D i

D o

D s

T a

T s

( )( )

f a

s o

s s

T T q

ln D D 12k h D

p -

=

+

( ) s o s f

ln D DT T q

2 k p =-