MIL-HDBK-1003/8A
APPENDIX A
HEAT LOSS CALCULATION DATA
PART 1:
EARTH THERMAL CONDUCTIVITY FACTORS
The earth thermal conductivity factors (Ke) in Btu-in/(hr) (sq-ft) (degrees F)
to be used in the heat loss calculations are as follows:
TYPE OF SOIL
Moisture Content
of Soil
Sand
Silt
Clay
Low (less than
2
1
1
4% by weight)
Medium (from 4% to
20% by weight)
13
9
7
High (greater than
20% by weight)
15
15
15
Note: Dry soil is exceedingly rare in most parts of the United States,
and a low moisture content should be assumed only if the assumption can
be proven valid.
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