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Heating Ventilating Air Conditioning Guide 1939
Table 2.
kConductivities ( ) and Conductances (C) of Building Materials and Insulators3--Continued
The coefficients are expressed in Btn per hour per square foot per degree Fahrenheit per 1 in. thickness unless otherwise indicated.
Material
Description
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AIR SPACES FACED WITH BRIGHT ALUMINUM FOIL
Air space, faced one side with bright alumi
num foil, over 5^-iu. wide
Air space, faced one side with bright alumi
num foil, H-in- wide__________
Air space, faced both sides with bright
aluminum foil, over
wide
Air sps^e, faced both sides with bright
aluminum foil. H-in. wide-----------------------
Airspace divided in two with single curtain
of bright aluminum foil (both sides bright)
each space over Ji-io. wide
each space H*tn. wide--- ------------------ ------
Air space with multiple' curtains of bright
aluminum foil, bright on both sides,
curtains mare than &-in. apart, air circu
lation between spaces prevented:
2 curtains, forming 3 spaces,_:
3 curtains, forming 4 spaces
4 curtains, forming 5 spaces_________ ____
__
-- -- --"
,, , --
50 50 50 50 '
SO 50
50 50 50
0.46f* 0.62f 0.41f 0^571
0.23t* 0.31f
\
0.I5P o.iit* 0.09P
2.17 1.61 2.44 1775
4.35 3.23
6.78 9.22 11.C6
(4) (4) (4) (4)
(4) (4)
(41 4) (
SPACES FACED WITH NON- Fabric with non-metallic reflective surface
METALLIC REFLECTIVE () in. thick) placed in center of a 13$ in.
SURFACE
air apa>__
.................... ....... -- 70 0.33f 3.03 (3)
Core of fiber board coated two sides with
non-metallic reflective surface (H in-
thick) placed in space having approxi
mately in. air space on each side__ __ 23.4 70 0.27t 3.70 (3)
Fiber board coated one side with non-
metallic reflective surface (% in. thick)
placed in space having approximately
in. air space on each side----r--.____ -- 75 0.49f 2.04 (3)
Air space divided in two with fabric faced
__both sides with non-metallic reflective
surface, each space over W-in. wide-----------
40 0.33f 3.03 (4)
Air space over 9^-in. wide faced one side
with noD-mctaUic reflective surface
--
40 0.67t
1.49* (4)
WOODS (Acrora Grain) Balsa
California Redwood..
0% mois
Douglas Fm_, Eastern Hemlock-- Hard Maple..
0% moisture--
0%
16% 16% 0% mois
0%
16%
16% 0%e 0% 8% 8%
16% 16%
20.0 90 0.58
1.72 (1)
8.8 90 0.38
2.63/ U)
7.3 90 0.33
3.03
"
22.0 75 0.66
1.53 (4)
28.0 75 0.70 .1.43 (4)
22.0 75 0.70 . 1.43 (4)
28.0 75 0.75
1.33 (4)
22.0 75 0.74
1.35 (4)
28.0 75 0.80
1.25 (4)
28.7 86 0.67 26.0 75 0.61.
1.49 1.64
((41))
34.0 7S 0.67
1.49 (4)
26.0 75 0.66
1.52 (4)
34.0 75 0.75
1.33 (41
26.0 75 0.76
1.32 (4)
34.0 75 0.82
1.22 (4)
22.0 75 0.60
1.67 !4>
30.0 75 0.76
1.32
4)
22.0 75 0.63
1.59 (4)
30.0 75 0.81
1.23 (4)
22.0 75 0.67
1.49 (4)
30.0 75 0.85
1.18 (4)
40.0 75 1.01
0.99 (4)
46.0 75 1.05
0.95 (4)
40.0 75 1.08
0.93 (4)
46.0 75 1.13
0.89 (4)
40.0 75 1.15
0.87 (4)
46.0 75 1.21
0.83 (4)
For notes see Page 95.
Chapter 5. Heat Transmission Coefficients and Tables
Table 2.
(C)Conductivities (it) and Conductances
of Building
Materials and Insulators3--Concluded
The coef-fic.ie._nftes aarree eexxpyressed in Btu puenr/hMo5uroPtheerrwsqisueareinfdoiocat tPeedr. degree Fahrenheit per l in. thickness
D ensitt (Lb per Co Ft) | A uthority j
Material
Description
WOODS--Continued Longleap Yellow Pink-
MahogantMa Maple or Oak--------Nobwat Pinsl---------
Red CtPRESS--
Red Oax_
0% 8% 8% 16% 16%
0% Q% 8%
16%
0% 8% 8%
16% 0% 0% 8% 8%
SaoBTLEAt Yellow Pine...
gf
8% 8% 16% 16% Sf
8% 16^
Virginia PinbWest Coast Hemlock--
White PineYellow Pint Yellow Pine or Fib__
16% 0% 0% 8% 8% 1166g% 0% 0% 8% 8% 16% 16%
0% 0% 8% 8% 16% 16%
a
a
a a
a a a a a
a
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a a
a a a a
o
a
a a a a
a a a
For notes see Page 95.
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30.0 75 0.76
1.32
4>
40.0 75 0.86
1.16 (>
30.0 75 0.83
1.21
(4)
40.0 75 0.95
1.05 (4)
30.0 75 0.89
1.12 (4)
40.0 75 1.03
0.97
4)
34.3 86 0.90
1.11
U
44.3 86 1.10
0.91
(1)
1.15*
0.87
22.0 75 0.62
1.61
(4)
32.0 75 0.74
1.35
(4)
22.0 75 0.68
1.47 (4)
32.0 75 0.83
1.21
(4)
22.0 75 0.74
1.35
4)
32.0 75 0.91 22.0 75 0.67
1.10 1.49
(4)
to
32.0 75 0.79
1.27 (4)
22.0 75 0.71
1.41
4)
32.0 75 0.84
1.19 (4)
22.0 75 0.74
1.35
(4)
32.0 75 0.90 38.0 75 0.98
1.11 1.02
4) (4)
48.0 7S 1.18
0.85 <41
38.0 75 1.03
0.97
(4)
48.0 75 1.24
0.81
(4)
38.0 48.0
75 75
1.07 1.29
U)0.94
0.78
4
26.0 75 0.74 36.0 75 0.91 26.0 75 0.79
1.35
1.10 1.27
54)
4> (4)
36.0 75 0.97
1.03 (4)
26.0 75 0.84
36.0
75
1.04
to1.19
0.96
<41
*28.0 75 0.73 34.0 75 0.88
1.37 1.14
(4) (4)
28.0 75 0.77
1.30 (4)
34.0 75 0.93
1.08 (4)
28.0 75 0.81
1.24 (4)
.34.0 75 0.97
36.0 75 0.89
1.03 1.12
(4) (4)
42.0 75 0.95
1.05
(4)
36.0 75 0.96
1.04 (4)
42.0 36.0
75 75
1.02 1.01
0.98 0.99
(t4o)
42.0
75
1.09
22.0 75 0.54
to0.92
1.85
(4)
28.0 75 0.64
1.56 (4)
22.0 75 0.59
1.70 (4)
28.0 75 0.71
1.41
4)
22.0 75 0.65
1.54
4)
28.0 75 0.78
1.28
4)
34.3 86 0.96
1.04
u>
22.0 75 0.68
1.47
(4)
30.0 75 0.79
1.27 (4)
22.0 75 0.73
1.37 (4)
30.0 75 0.85
1.18 (4)
22.0 75 0.78
1.28
4)
30.0 75 0.91
1.10 (4)
31.2 86 0.78 __ 1.00
1.28 1.00
(3)
-- -- 0.80* 1.25
101