WAC 51-11-1008
Section 1008 Air infiltration.
1008.1 General: Tables 10-8 and 10-8A list effective air
change rates and heat capacities for heat loss due to
infiltration for Group R Occupancy.
Estimated seasonal average infiltration rate in air
changes per hour (ACH) is given for standard air-leakage
control (see section 502.4 of this code for air leakage
requirements for Group R Occupancy). The effective air-change
rate shall be used in calculations for compliance under either
the Component Performance or Systems Analysis approaches.
Heat loss due to infiltration shall be computed using the
following equation:
| Qinfil = ACHeff* HCP |
| where: |
Qinfil |
= |
Heat loss due to air infiltration |
|
ACHeff |
= |
the effective air infiltration rate in Table
10-8 |
|
HCP |
= |
the Heat Capacity Density Product for
the appropriate elevation or climate zone
as given below. |
TABLE 10-8
ASSUMED EFFECTIVE AIR CHANGES
PER HOUR
| Air-Leakage |
Air Changes per Hour |
| Control Package |
Natural Effective |
| Standard |
0.35 0.35 |
TABLE 10-8A
DEFAULT HEAT CAPACITY/DENSITY PRODUCT FOR
AIR
| Zone |
Average Elevation |
Heat Capacity/Density |
| 1 |
Mean Sea Level |
0.0180 Btu/h•°F |
| 2 |
2000 |
0.0168 Btu/h•°F |
| 3 |
3000 |
0.0162 Btu/h•°F |
[Statutory Authority: RCW 19.27A.025, 19.27A.045. 01-03-010,
§ 51-11-1008, filed 1/5/01, effective 7/1/01; 98-03-003, §
51-11-1008, filed 1/8/98, effective 7/1/98. Statutory
Authority: RCW 19.27A.020 and 1990 c 2. 91-01-112, §
51-11-1008, filed 12/19/90, effective 7/1/91.]