Sharp JX-9400 Información técnica descargar pdf (Pagina 204)

Reductive sealing method

A method of determining the leakage of speciﬁc building comp onents by

pressurizing the building and recording the leakage changes as components

are sealed successively. When all the major outlets and component cracks are

sealed, the remainder is the background leakage.

Relative contaminant removal eﬀectiveness

Ratio of the concentration that could be reached, at equilibrium, in the same

zone or building with the same tracer or contaminant sources, to the average

tracer or contaminant concentration. Also the ratio of the room mean age of air

to the contaminant or tracer turnover time. It is the inverse of the distribution

eﬀectiveness.

Residence time

See age of the air.

Residual gas analyser

See mass spectrometry.

Retroﬁt

The process of reducing energy loss in a building by physical means, for

example, reducing excess air inﬁltration by obstructing ﬂow through cracks

and openings.

Reynolds number

Ratio of the inertial force to the friction force. It is also the ratio of the velocity

of a ﬂuid to its dynamic viscosity, multiplied by a typical dimension, for

example, the duct diameter.

Room

Volume of a building limited by building elements. In ventilation technique,

this concept keeps its usual mean ing. A room may be divided in several cells

and several rooms may be combined in a zone.

Room mean age of air

Average of the mean age of air over the whole room.

Sample container

Container used to obtain a sample of air/tracer mixture from a measured

building. The sample is usually returned to a laboratory for analysis.

Short-circuiting

A direct ﬂow path between an air supply point and an air extract point, i.e., air

ﬂows along the shortest path, without mixing.

Single tracer gas technique

General term applied to any method using only one tracer gas. These methods

are usually used to evaluate air change rate.

Single zone

Any case where a building or part of a building is considere d to be a single well-

mixed space.

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Sharp JX-9400 Información técnica Pagina 204