On the power law and quadratic forms for representing the leakage-pressure relationship – Case studies of sheltered chambers

Estimation of the infiltration rate of UK homes with the divide-by-20 rule and its comparison with site measurements

“…The amount of airflow exerted by the fan is related to the established pressure difference to provide the leakage-pressure relationship of the building. Such relationship can be mathematically represented by either a quadratic equation [23,24,25] or a power law equation, the latter one is the broadly used and accepted form, as described by eq. ( 1) [26].…”

Numerical and experimental validations of the theoretical basis for a nozzle based pulse technique for determining building airtightness

“…it is similar to the effective overall electrical resistance when multiple electrical components with different resistances are connected in parallel. Hence, it is worth noting that the effective length of opening discussed herein is different from the dimension of a single opening, for instance, a chimney, but rather an effective hydraulic length of all openings combined [47]. Therefore, the effective overall flow resistance of a network of building leakage pathways is dominated by the ones with small flow resistance, such as short and wide openings.…”

Evaluation of the indoor pressure distribution during building airtightness tests using the pulse and blower door methods

“…[20,42,43]. The key model specification error is related to the assumption that the flow can be extrapolated using a power-law formulation; thus, the error can be caused by extrapolating data beyond the measurement limits [45].…”