Effective leakage area

Effective leakage area

Calculation in square inches equal to the total area of all air leaks in a building envelope. Defined by the Lawrence Berkeley National Laboratory, the ELA is the area of a nozzle-shaped hole that would leak the same amount of air as the building does when pressurized to 4 pascals. Estimating leakage in this way enables one to visualize the cumulative impact many tiny holes can have on the air-tightness of a house.
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The rate of air leakage can depend on several factors including the effective leakage area, locations of the leakage paths, air pressure difference between the containment system and the data center room, rack heat load and associated server airflow rates, as well as on the length, width, and height of cold and hot aisles.
D] = 1), where ELA is the effective leakage area, or EqLA ([DELTA][p.
These envelope leakage values are summarized in Table 1 together with Effective Leakage Area at 4 Pa (ELA4).
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