MIL-HDBK-1003/19
TABLE I.
Steady state aperture conductances of passive systems.
System
Uc
Number
System Type
(Btu/hr-ft2-deg.F)
1
Single glazed direct gain.
1.10
2
Double glazed direct gain.
0.49
3
Single glazed radiant panel.
0.49
4
Double glazed radiant panel.
0.31
5
Triple glazed direct gain.
0.31
6
Double glazed direct gain with
R-9 night insulation.
0.27
7
Double glazed 12-inch Trombe
wall.
0.24
8
Double glazed attached sunspace
with 40 degree tilt from
vertical, masonry common wall,
and opaque end walls.
0.23
9
Double glazed 12 inch Trombe
wall with R-9 night insulation.
0.15
10
Single glazed front flow TAP
with R-11 insulated wall.
0.073
11
Double glazed front flow TAP
with R-11 insulated wall.
0.068
12
Double glazed backflow TAP with
R-11 insulated wall.
0.064
13
Double glazed attached sunspace
with 40 tilt from vertical,
R-20 insulated common wall,
and opaque end walls.
0.043
14
Double glazed backflow TAP with
R-20 insulated wall.
0.041
A more complete list of aperture conductances is available in
Appendix A; those appearing in table I provide a representative
sample that spans the full range of realistic possibilities and
is adequate for the present discussion.
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