Table 10. Coefficients for eq 133.
Pipe or
insulation
Effective gap
radius
A
B
eq
Description
4-in. pipe in the 1-ft 1-ft enclosure, numerical and
0.396068
0.1875
12.026
0.003094
134
experimental data, emissivities: pipe, 0.9; enclosure, 0.9.
4-in. insulated pipe in the 1-ft 1-ft enclosure, numeri-
0.312738
0.27083
10.9327
0.003057
135
cal and experimental data emissivities: pipe insulation,
0.9; enclosure, 0.9.
2-in. pipe in the 1-ft 1-ft enclosure, numerical and
0.484608
0.9896
9.7324
0.004123
136
experimental data, emissivities: pipe, 0.9; enclosure, 0.9.
2-in. insulated pipe in the 1-ft 1-ft enclosure, numeri-
0.401278
0.18229
12.4199
0.001706
137
cal and experimental data, emissivities: pipe insula-
tion, 0.9; enclosure, 0.9.
4-in. pipe with 2 in. of insulation in the 1.27-ft 1.27-ft
0.401296
0.35416
13.2964
0.003680
138
enclosure, emissivities: pipe insulation, 0.9; enclo-
sure, 0.9.
4-in. pipe in the 1-ft 1-ft enclosure, numerical and
0.396068
0.1875
7.205
0.003387
139
experimental data, emissivities: pipe, 0.9; enclosure, 0.6.
4-in. pipe in the 1-ft 1-ft enclosure, numerical and
0.396068
0.1875
10.059
0.003424
140
experimental data, emissivities: pipe, 0.5; enclosure, 0.9.
50
eq 138
eq 137
eq 134
eq 135
10
eq 140
eq 136
eq 139
5
20
40
60
80
100
Average Temperature of Inside Surfaces (F)
Figure 43. Effective conductivity correlations.
14
13
12
11
10
A = (9.9585)r + 9.5031
9
8
0.1
0.2
0.3
0.4
0.0
Outside Radius of Pipe or Insulation (ft)
Figure 44. Correlation of pipe radius with intercepts.
43
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