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Equation 7:

where:

Air Infiltration and Ventilation

The hourly natural air change rate for a single-family home (detached or attached) Benchmark shall be calculated based on the specific leakage area (SLA) determined using Equation 8:

Equation 8:

SLA = ELA/CFA = 0.00057

where:

ELA = effective leakage area (ft2), defined as the amount of open area that

would result in the same total air exchange as the actual leakage area of the house at a pressure of 4 Pa CFA = conditioned floor area (ft2)

For a multi-family building, the SLA values for the Benchmark are specified in Table 14 (NREL 2009). These values include only leakage area to the outside. They do not consider the infiltration rates between apartments because other apartments are assumed to be space conditioned as well. However, the SLA values do consider how the unit’s location (ground or top floor) affects the infiltration.

Table 14. Multi-Family Common Space and Residential Unit SLA Values for Benchmark

Central Laundry

0.00019

Office

0.00036

Indoor Corridors

0.00007

Workout Room

0.00019

Central Restroom

0.00019

Multi-Purpose Room

0.00027

Residential Unit

0.00006+0.0009(T)

Room Type

SLA

When specifying natural infiltration for a single family detached or attached Benchmark with either a directly or indirectly conditioned basement, the SLA shall be adjusted to account for the

where:

T=

Area of perimeter surfaces exposed to unconditioned space (including a ceiling or floor if unit is on top or bottom floor respectively)/total area of perimeter surfaces for the residential unit (including ceiling and floor area)

22

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