Sharp JX-9400 Informações Técnicas descarregar pdf (Página 201)

Indoor air pollution

Pollution occurring indoors from any source, i.e., from outside as well as inside

the building.

Infrared gas analyser

Instrument used to determine tracer gas concentrations by determining the

transmission of infrared radiation at an absorption frequency throu gh a ﬁxed

path length.

Inter-zonal airﬂow

General term applied to the process of air exchange between internal zones of a

building.

Leakage area

See equivalent leakage area.

Leakage characteristics

Equation relating the airﬂow rate through a leak and the pressure diﬀerential

across this leak. This relation involves the ﬂow coeﬃcient and the ﬂow exponent .

Leakage path

A route by which air enters or leaves the building or ﬂows through a

component.

Leakage site

A point on the outer or inner surfaces of a building envelope or an internal wall

where a leakage path emerges.

Leeward

Downwind side of any object.

Manometer

A device for measuring pressure employing the principle of displacement of

liquid levels in a liquid-ﬁlled u-tube. The limbs of the ‘u’ may be vertical,

inclined (draught gauge) or curved.

Mass balance

See continuity equation.

Mass ﬂow controller

Device controlling the ﬂow rate of a gas by means of a valve controlled

according the measurement of the mass ﬂow rate.

Mass spectrometry

Technique allowing the quantitative measurement of amou nts of diﬀerent

gases, based on the separation of the ionized gas molecules according their

mass-to-charge ratio.

Mechanical ventilation

Ventilation by means of one or more fans.

180 Ventilation and Airﬂow in Buildings

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