Roxul Industrial Insulation Process - Manual (Page 134)

Unit
s, c
onv
er
sion f
act
or
s and t
abl
es
Symbol Definition US Unit Notes
R Thermal resistance
hr.ft 2 .°F/BTU linear orientation
hr.ft.°F/BTU cylindrical orientation
hr.°F/BTU spherical orientation
r Thermal resistivity
hr.ft 2 .°F/BTU-in (conventional unit)
hr.ft.°F/BTU (alternative)
r
a
Apparent thermal resistivity hr.ft 2 .°F/BTU-in
- Heat Energy BTU
Q Heat Flow Rate BTU/hr
q Heat Flux BTU/hr.ft 2
T Temperature °R or °F
T
s
Absolute Surface Temperature (Rankine) °R
T
o
Absolute surroundings temperature (Rankine) °R
i
inner boundary layer - subscript
o
outer boundary layer - subscript
s
surface - subscript
1 … n
internal layer - subscript
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