1 Indicates cells that require user input.
1 Indicates cells that give the output.
Internal Temperature, TioC
External/Ambient Temperature, TooC
Heat transfer coefficient for heat transfer inside, i
kcal/m2h
oC or W/m
2K
Heat transfer coefficient for heat transfer outside, o
kcal/m2h
oC or W/m
2K
Total resistance at internal surface, Ri m2h
oC/kcal or m
2K/W
Total resistance at outer surface, Ro m2h
oC/kcal or m
2K/W
Temperature at 1st refractory layer surface, Th = Ti - (q x
Ri)oC
Thickness, S mm
Thermal conductivity, K kcal/mhoC or W/mK
Thermal resistance, Rn = S/(K x 1000) m2h
oC/kcal or m
2K/W
Border layer Temperature, Tn= Tn-1 - (q x Rn)oC
Temp drop across layer, Tn+1 - TnoC
Total Thermal resistance, R = Ri+R1+R2+R3+Ro m2h
oC/kcal or m
2K/W
Heat flow (flux) density, q = (Ti - To) / R kcal/m2h or W/m
2
oC
oC
oC
oC
oC
oC
oC
Ti =
Th =
T1 =
T2 =
T3 =
T4 =
To =
217
217
216
55
1000
217
948
217 216
0 1
Diagramic representation of Ouput
948
CALCULATION SHEET FOR TEMPERATURE DROP ACROSS REFRACTORY
Description Unit
0.0003
Metal shell
80 0 0 8
1
731
1
0
217
0
0.287
0.2787
30.11
1st Refractory
layer
2nd Refractory
layer
3rd Refractory
layer
0.3604
2622
0
1000
55
50
16.29
0.0200
0.0614
217
