Document Qeyoy8OMvzKyg8Djdq5yyjmE
422
CHAPTER 24
1965 Guide'And Data Boole
Table 3------Thermo) Conductances and Resistances of a Plane* Air Space*
Petition of
. Air. Space '
Direction of
Hoof '' Row'
Air Spot*
Moca
Tup,* F
Diff?
0.03
Horiz.
90 10. 0.42
50' 30
0.58
` 50 10 0.43
Up 0 20 0.55
-0 10 0.45
-50 20 0.58
-50 10 0.47
45 Slope
90 10 0.33 50 30 0.50 50 10 0.34 Up 0 20 0.46
0 . 10 0.36 -50 20 0.50 -50 10 0.38
Vertical '
Horiz.
90 50 50
0 0 -50 -50
10 0.28 30 0.34 10 0.27 20 0.31 10 0.25. 20 0.32 10 0.24
45 Slope
90
50
. Down..
50
0 o
-50
-50
10 30 10 20 10= 20 10
0.29 0.29 0.26 0.26 0.23 0.25 0.21
Thermal Conductance -- C
Value of E*^
0.05
0.2
0.5
0.44 0.60 - 0.45 0.56 0.46 0.59 0.48
0.61
0.73 0.59 0.66 0.56 0:66 _ 0.55
0.36 v 0.51
0.36 0.48 0.37:. 0.51 0.39
0.53 0.65 0.50 0.58 0.47 * 0.58
0.46
0.96 1.0 0.86 0.86 0.76 0.80 0.70
0.87 0.92 0.77 0.78 0.67 0.72 0.60
0.31 0.36 0.29 0.32 0.27 . 0.33 0.25 -
-0.48 0.49 0.42 0.42 0.37' 0.40 0.32
0.31 0.31 0.28 0.27 0.25 0.26 0.22
0.48 0.44 0.42 0.37 0.35 0.33 0.29
0.82 0.76 0.70 0.62 0.57 0.54 0.46
0.82 0.71 0.69 0.58 0.55 0.47. 0.43 .
$ ia, TTudman
Thermal Resistance*-- R
Value of &
0.84
0.03
0.05
0.2.
0.5
0.82
1.32 1.24 1.15 1.07 0.98 0.95 0.85
2.39 1.72 . 2.33 1.83 2.23
1.73 2.11'
2.26 1.67 2.23 1.79 2.16 1.71 2.07
1.63 1.37 1.71' 1.621.78 1.62
1.81
1.06 1.0 1.16 1.16 1.31 1.25 144
0.76 0.78 0.87 0.93 1.02 1.06 1.18
1.24 1.20 1.06 0.99 0.88 0.88' 0.75
3.01 2.02 2.94 2.16 2.81 1.99 ' 2.66
2.81 1.96 2.78 2.27 2.71 1.96 2.69
1.90-
1.64 2.02
1.74 2.13 1.72 2.19
1.16 1.09 1.30 1.29
1-49 1.38 1.67
.
0.81 0.83 0.94 1.01 1.13
1.14 .1.33
1.19 1.04 0.99 0.84 0.78 0.69 0.61
3.64 2.96 3.72 3.23. 3.96 3.15 -4-23
3.28 .2.80
3.48 3.10 3.73 3.06 4-07
2.10
2.04 2.36 2.38. 2.73 2.51 3.16 .
1.22 1.32 1.431.60. 1.76 1.86 2.18
. 0.84 0.96 1.01 1.19 1.28
11-44 I.64
1.19 0.99 0.98 0.79 0.76 0.62 0.58
3.61 3.47 3.82 3.83 4-28 4.05
4.84
3.24 3.27 3.67 3.65 4.04 3.90
-*'55
2.09 2.27 2.40 2.67
2.88 3.06 , S.48
1.211.41 1.46
1.74 1.82 2.13 2.33
0.84 1.01 1.02 1.27 1.31. 1.61 1.72
PosHioo ef Air -
Space
Horiz.
: r'f--:
0/recfioa w. ,of . Heat
Flow
Air Space
Thick ness,
in.
w F . 0:03
Down*
90 H . '50
0 -50
0.28 0.26
0.23 0.21
90 0.17
m 50 . 0.16
0 . 0.14
-50
0.12
... 4
90 50
0. -50
0.10 " 0.09 0.08 0.07
$ inch Thickness*
.Thermal Conductance -- C
'. Thermal Resistance -- R
,'
Value of E
Value of E '
0.05
0.2
6.5 ,
0.82
0.03
0.05 . 0.2
0.5 '0.82
0.31 0.28 '
0.25 0.22
0.48 0.42
0.35 0.29
0.82 0.69 0.55 0.43
1.19 . 0.98 0.76 . 0.58
3.66 3.80 4 284-84
8.25 3:66
4.04 . 4.63;
2.08\2.S9
2.88 .. S.48
1.21
J 1.44 .1.82 :
2.33 '
0.84 ; . 1.02
1.31 1.72
0.19 0.17 0.15 0.13
0.36 0.31 0.25 0.20
0.71 0.59 0.45 0.34
1.07 0.88 0.67 0.50
6.96 6.41
7.18 . 8.23
6.24-
6.74 . 6.69
7.63'
2.76 - 1.42
.,.3.21
1.71
3.97 . 2.21
' 4.96 ' ' 2.90.
0.93
1.14 . 1.60 2.02
0.12 0.11
0.09 0.08
0.30 0.25 0.19 : 0.15
0.64 0.52 0.39 0.29
1.01 0.81 . 0.61. 0.45
9.92
8.08 ' -3.38
1.66 0.99
10.7 . 8.94
4.02 -.1.91 ;1.23
12.4
10.9 - 6.20 2.64
1.66
14.0 ` 12.3
' 6.67
'3.40 ` 2.24
t Actual thicknesses of lumhnr iLw'nm^!tn fc. aa follomi: .
\ Nominal;.
1 in._ (8-2rS). 1H in. (&2-S). 2 in, (8-2-S), 2H in. (S-2-S),
-lActual'.. Nominal..
Actual
-JH 3 in.i(S-2-S)./..2H in. . 1He in. 4 in. (8-2-S)....'......... ZH in. 1% in. Finish flooring
.i2%..in.< - (maple or oak)....... )i in.
It should,be noted that the effects'olpopr`workmanship in construction - and. installation .have1 an increasingly greater
percentage .effect on heat taaemission aa the coefficient be comes numerically, smaller. Failure to' meet `design estimates may be caused by lack of proper attention to exact compliance
with specifications. A factor of safety, may,be.employed as a precaution when it is desirable.
Caution'
Although the validity of calculating U values for all of the types of constructions in Tables 5 through 17 has not been fully, demonstrated- calculated .values are 'given because measured values are not available. It is emphasized that the calculated values in Tables 5 through 17 :are given for- the convenience of the reader. : . v
In calculating U values;-exemplary conditions of'compo nents and installations are assumed, i.e., insulating matorlalQ
Gqeffldenl*
- - Table 3 .... Tbermai Conauciances:an<i,Reii*iances cf a Pia.".=" Air Space iCondudedi
Rodtfen of Air -
Sp0C*.-
Direction
of Heat . How
Mean Teeip,*
F
Temp OHf, F deg
Horiz..
Up .
90 50 50
0 0 -50 -50
45* Slope
.90 50
.50 up '0
0 -50
-50
Vertical ;
' Horiz.
90 50 ' 50
0 0 --50 -50
45 Slope
Down
, 90 50 50 0 0
-50 --50
10 30 10 20 10' 20. 10
10 30 10 20 10 20 10
10 30 10 20 10 20 10
10 30 10 20 10 20 10
Thermal Conductance -- C
Value of
0.03
0.05
0.34 0.47 0.35 -0.44' 0.36 0.46 0.38-
0.36 0.48 0.37, 0.45 0.37 0.47. 0.39
0.31 0.43 031 0.40 0.32 0.42 0.34
0.33 0.45 . 0.33 .0.41 r0.34 ` 0.43 0.35
0000000
0.27 0-36 0.27'0.34
0.28 0.35 0.29
0.21
0.23
0.28
0.29
0.21
0.23
0.28- - 0.27
0.21
0.23
0-26
0.27
0.22
0.23
0.2
0.5
0.53 0.62 0.50 0.55 0.47 0.54 0.46
0.88 0.89 0.78 0.75 . 0.67 0.68 0.60
0.51 0.58 0.47 0.51 0.44 , 0.50 0.42 ,
0.85 0.85 0.74 0.71 0.64 0.64 0.56
0.46 : 0.81
0.52
.0.78
0.43\ 0.70
0.45
0.65
0.39
0.59
0.43
0.57
0.37
0.51
0.40
0.74
0.43 ' 0.70
0.36
0.64
0.37 ' 0.57
0.33
0.53
0.34, 0.48
0.30.
0.45
Thermal Resistance* -- R
Value of E4
0.82
1.24 1.17 1.07 0.98 ' 0.89' 0.84 0.75
1.21 1.14 1.04 0.93 0.85 0.79 ,0.71
0.02
2.94 2.14 . 2.88. ; 2.28 2.77 2.17 2.64
3.22 2.32 3.18 2.60 > 3.09 2.39 2.97 .
0.05
0.2
2.75 2.06 2.73 2.22 '2.67 .2.12 2.67
1.87 1.62 1.99 ' 1.81
2.11
1.84 ' 2.18
3.00 2.22 3.00 2.42 2197 2.33 2.89 .
1.98 1.71 2.13 1.95
2.49 2.00
2.40
0.5 ' 0.82
1.14 1.13 . 1.29 '
"1.33 .
1.48 1.48 1.68
0.80 0.86
0.94 :i,0S
1.12 1.20 1.88
1.18 1.17
1.34 1.40 1.67 1.66 1.79
0.82 0.83 0.96 1.08 1.17 1.26
1M
1.17. .1.07 0:99 0.87 0.81 0.72
0.67 '
3.73
2.74 3.69 `2.98 3.69. 2.89 3.48 '
3.44 , 2.62
3.46 2.86
3.42 .2.82
'3.34
2.16
1.94 2.34 2.22 2.56 2.36 2.70
r.11 . 0.98 0.93 0.78 0.74 0.64 0.60
.4,84 3.61 4.79 3.92 `4.67 3.82'
4-47
. 4-S6 3.39
4M 3.73 4.39 3.68 4.29-
2.60 2.33
2.76 2.71 3.06 2.92 3.29
1.24 1.28
1.4S 1.63 1.69 1.76 1.95 .
0.91
0.94 1.01 1.16
1.24 1.39 1.60
i.34`
1.44 1.67 1.76 1.89 .061
2.24
0.90 1.02 1.08 1.27- -
:i:s5 : 1 .'57 1.67
by the foDawifiS ttbta of dumud departure*. For snore prewe wtuea. u>e renTO1CB B _ ....
Direction of Heat Flaw '
Mean Temp^ F
' Temp. Offf deg F
0.03
-0.05
Value of 0.2
0.5
0.82
45 Up
Horiz.
45* ..' Down
0 -50
90 50
0 0 -50 -50
90 50
0 -50 -50
20 20-
10 30 20 10 20 10
10 10' 10 20 10
+ 5.7 + 10.0
+12.5 -10.4 . -12.7 - 8.0 -18.0 -20.3
+35.5 +27.0 + 15.8 -10.0 - 8.9
+10.0
+ 11.5 - 8.3 -11.3 - 8.1 -17.9 -19.3
+32.5 +24.5 +13.8 . -11.0 - 7.9
+ 8.6
+ 6.4 - 6.4 - 9.4 - 6.4 -15.0 -16.6
+18-0 +14.1 + 8.8 . - 8.4
+ 6.3
-- 6.8
-11.3 -12.2
+ 9.3 + 8.4 + 5.2 - 5.9 - 5.9
+5.4
-5.2
-9.2 -9.5
+6.4 +5.7
-
x"
Interpolation, and moderate extrapolation, efoondactanee rahwa an eDima_a_vi.ty E. ... .valima fo_r 0. anH --. 6l0. F,'mmoan tem/_pe_lr_altu/r_e*_a
ermisetHe lor otter values oj mesa wBrnpereMue.
--
e extrapolated from Uu experimental date uamga duaessumleee eorwlation.
, . *__ a ' i_w. *
-- nf tK.. nifif-- of the air spa" c--e. (Seea Seeccttuion B of
The rmistuca vahiea were determined from the relatiraahip- - 1-./C
rounding off the----*--value to two decimal place* for tabulation.
1 The eandnctaaeee of horisontal epaeea with heat flow djwwri
.
Agency, 1954 (Superintendent of
Based on National Bureau of Standard* <h.ta<presentod m &tau8 *"
Documents, D. S.'Government Pristine Office. Washington 23, D. C.}.
are uniformly, of the nominal thickness and conductivity, air spaces are of- uniform thicknessi and surface temperatures, that effects due to moisture are not involved, and that instal lation details are in accordancewith design.,Some evidence of
departures of measured values from calculated values for certain insulated constructions is given in Building Materials
{Continued on p. 427)