Figure B-2 – Summary of Annual ACH at Heating and Cooling
|
Case/Condition |
ALBANY |
MIAMI |
SEATTLE |
||||||
|
Mean air change rate (h-1) |
Percent of hours < 0.25 h-1 |
Percent of hours < 0.35 h-1 |
Mean air change rate (h-1) |
Percent of hours < 0.25 h-1 |
Percent of hours < 0.35 h-1 |
Mean air change rate (h-1) |
Percent of hours < 0.25 h-1 |
Percent of hours < 0.35 h-1 |
|
|
1/Envelope leakage only |
0.27 |
39 |
83 |
0.14 |
100 |
100 |
0.23 |
67 |
99 |
|
2/Scheduled exhaust fans |
0.32 |
33 |
71 |
0.19 |
87 |
89 |
0.27 |
57 |
84 |
|
3/Forced-air operating on outdoor temperature |
0.42 |
13 |
38 |
0.29 |
64 |
87 |
0.36 |
17 |
66 |
|
4A/Intake on forced-air, operating on outdoor temperature |
0.46 |
10 |
28 |
0.31 |
49 |
87 |
0.38 |
13 |
52 |
|
4B/Intake on forced-air, occupancy schedule |
0.64 |
4 |
11 |
0.49 |
20 |
46 |
0.58 |
4 |
18 |
|
5A/Passive inlets and whole house exhaust on exhaust schedule |
0.49 |
6 |
25 |
0.35 |
30 |
82 |
0.43 |
6 |
42 |
|
5B/Passive inlets and whole house exhaust on occupancy schedule |
0.57 |
2 |
9 |
0.41 |
10 |
56 |
0.52 |
2 |
11 |
|
6A/ Whole house exhaust (no inlets) on exhaust schedule |
0.44 |
13 |
39 |
0.31 |
64 |
87 |
0.38 |
17 |
66 |
|
6B/ Whole house exhaust (no inlets) on occupancy schedule |
0.53 |
5 |
15 |
0.37 |
30 |
65 |
0.48 |
6 |
23 |