The table summarizes the calculated wall systems’ heat flows and R-values as well as the temperature data needed for those calculations. The listed data is the average over the steady-state collection period. The following is a description of the individual components listed in the table. It summarizes hot-box test results for all test wall assemblies – surface-to-surface R-values are shown in bold. Columns Steel 1 - Steel 6 are hot-box test results for steel-framed wall assemblies using studs installed at 24-in. on center. Steel 10, 12, and 16 are hot-box test results for steel-framed wall assemblies using studs installed at 16-in. on center.
|
Steel 1 |
Steel
2 |
Steel
3 |
Steel
4 |
Steel
5 |
Steel
6 |
Steel
10 |
Steel
12 |
Steel
16 |
|
Base 24 in. |
3/4" XPS / OSB frame |
3/4" XPS external |
Aerogel OSB frame |
Insulated stud clusters |
1"
XPS external |
Base 16" |
3/4" XPS external |
1"
XPS external |
C-CAV
Average surface temperatures over cavity
(climate side) (°F) |
51.5 |
51.2 |
51.3 |
51.5 |
51.5 |
51.2 |
51.4 |
51.3 |
51.3 |
| C-STUD Average surface temperatures over stud (climate side) (°F) |
54.3 |
52.0 |
51.7 |
52.6 |
54.4 |
51.6 |
553.7 |
51.7 |
51.7 |
C-TRACK
Average surface temperatures over track (climate side) (°F)
|
55.7 |
52.8 |
52.5 |
53.7 |
56.9 |
51.8 |
55.8 |
52.8 |
52.1 |
Tcs
Weighted average external surface temperature (climate side) (°F)
|
52.1 |
51.4 |
51.4 |
51.8 |
52.2 |
|
52.0 |
51.4 |
51.4 |
M-CAV
Average surface temperatures over cavity (meter side)
(°F)
|
97.3 |
98.1 |
98.1 |
97.5 |
97.2 |
98.3 |
96.8 |
97.9 |
98.2 |
M-STUD
Average surface temperatures over stud (meter side)
(°F)
|
90.2 |
94.0 |
93.9 |
92.5 |
89.7 |
94.3 |
90.0 |
93.7 |
94.0 |
| M-TRACK weighted average of surface and joint TC's, meter side (°F) |
89.4 |
92.2 |
92.5 |
91.8 |
89.4 |
92.7 |
91.2 |
94.0 |
92.2 |
Tms
Weighted average external surface temperature (meter side)
(°F)
|
95.7 |
97.2 |
97.1 |
96.4 |
95.6 |
97.4 |
95.2 |
96.8 |
97.2 |
C-SURR
Average surface temperatures in the guard area (climate side) (°F)
|
51.9 |
52.7 |
53.1 |
52.2 |
51.9 |
53.8 |
51.0 |
50.9 |
53.2 |
M-SURR
Average surface temperatures in the guard area (meter side) (°F)
|
93.0 |
94.4 |
94.1 |
93.7 |
92.3 |
94.5 |
93.5 |
95.1 |
94.5 |
| Tma average of 36 air TC's, meter side
(°F) |
100.0 |
100.0 |
100.0 |
100.1 |
100.0 |
100.1 |
100.0 |
100.0 |
100.0 |
| M-BAF-T average of 24 baffle TC's, meter side
(°F) |
98.6 |
99.2 |
99.1 |
99.0 |
99.1 |
99.3 |
98.5 |
99.1 |
99.2 |
| Tca average of 48 air TC's (climate side) (°F) |
49.9 |
50.0 |
50.1 |
50.0 |
49.9 |
50.1 |
50.0 |
50.0 |
50.0 |
| C-BAF-T average of 36 baffle TC's, meter side (°F) |
51.0 |
51.0 |
51.1 |
51.2 |
51.2 |
51.2 |
51.0 |
50.9 |
51.1 |
| M-AIR-VC air velocity, meter side (MPH) |
0.44 |
0.46 |
0.47 |
0.45 |
0.44 |
0.48 |
0.43 |
0.45 |
0.47 |
| C-AIR-VC air velocity, climate side (MPH) |
3.19 |
3.38 |
3.50 |
3.26 |
3.13 |
3.36 |
3.49 |
3.63 |
3.29 |
| TMP-DC (Btu/Hr) Total measured energy into metering box (Btu/hr) |
457.70 |
297.28 |
292.93 |
364.60 |
455.53 |
274.64 |
477.47 |
310.31 |
291.80 |
| ∆T temperature difference across sample wall |
43.6 |
45.8 |
45.7 |
44.7 |
43.4 |
46.1 |
43.1 |
45.4 |
45.8 |
| T(mean) mean temperature across sample wall |
73.9 |
74.3 |
74.3 |
74.1 |
73.9 |
74.3 |
73.6 |
74.1 |
74.3 |
| Qmb fl energy exchange through meter box walls (Btu/hr) |
4.838 |
4.833 |
4.844 |
4.850 |
4.857 |
4.866 |
4.845 |
4.846 |
4.858 |
| Qwall calculated energy flow through specimen wall (Qwall - Qsurr) |
457.7 |
297.27 |
292.92 |
364.60 |
455.54 |
274.65 |
477.47 |
310.31 |
291.81 |
| Rwall surface to surface R-value of wall (hr*ft2*°F/Btu) |
6.09 |
9.85 |
9.99 |
7.84 |
6.10 |
10.74 |
5.78 |
9.37 |
10.05 |
| Ru wall overall R-value of sample wall (air-to-air), Rms air + Rwall + Rcs air (hr*ft2*°F/Btu) |
7.07 |
10.93 |
11.08 |
8.90 |
7.10 |
11.85 |
6.77 |
10.47 |
11.15 |
| Rms air meter side air
film resistance
(hr*ft2*°F/Btu) |
0.602 |
0.616 |
0.628 |
0.645 |
0.626 |
0.631 |
0.656 |
0.662 |
0.630 |
| Rcs air climate side
air film resistance
(hr*ft2*°F/Btu) |
0.309 |
0.301 |
0.297 |
0.310 |
0.317 |
0.283 |
0.270 |
0.289 |
0.305 |
