Sharp JX-9400 Technical Information PDF herunterladen (Seite 196)

adventitious openings), caused by pressure eﬀects of the wind and/or the

eﬀect of diﬀerences in the indoor and outdoor air density.

Air inﬁltration characteristic

The relationship between the inﬁltration airﬂow rate into a building and the

parameters that cause the movement.

Air leakage

Airﬂow rate through a component of the building envelope, or the building

envelope itself, when a pressure diﬀerence is applied across the component.

Air leakage characteristic

An expression that describes the air leakage rate of a building or component.

This may be:

the air leakage ﬂow rate at a reference pressure diﬀerence across the compo-

nent or building envelope;

the relationship between ﬂow rate and the pressure diﬀerence across the

building envelope or component;

the equivalent leakage area at a reference pressure diﬀerence across the

component or building envelope.

Airtightness

A general descriptive term for the leakage characteristics of a building.

Analyser

Instrument used to measure the concentration of a tracer gas or a contaminant in

a sample of air.

Anemometer

Any instrument measuring the air speed or the air velocity.

Background concentratio n

Concentration of a gas in outdoor air.

Background leakage

Leakage of air through a building envelope that is not accounted for by obvious

measurable gaps.

Balanced fan pressurization

Technique utilizing two or more blower doors to evaluate the leakage of indivi-

dual internal partitions and external walls of multi-zone buildings. Technique

involves using the fans to induce a zero pressure diﬀerence across certain

building components, thus eliminating their leakage from the me asurement.

Balanced ventilation

Ventilation systems in which fans both supply and extract air from the enclosed

space, the supply and extract ﬂow rates being equal.

Blower door (or fan door)

A device that ﬁts into a doorway for supplying or extracting a measured ﬂow

rate of air to or from a building. It is normally used for testing for air leakage

by pressurization or depressurization.

Glossary 175

1 2 ... 191 192 193 194 195 196 197 198 199 200 201 ... 210 211

Keine Kommentare

Sharp JX-9400 Technical Information Seite 196