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with k 6¼ 2(k ¼ 4 is not recommended here).

Q

TðP; 1Þ

 C

ﬃﬃﬃﬃﬃﬃ

ð2:52Þ

where

¼ Q

C

þ Q

C

þðQ

þ Q

 Q

C

þðC

 C

Q

þðC

 C

Q

þ ðk; 2ÞI

where: k ¼ 1, 2 or 3; and the delta function ðk; 2Þ¼1ifk ¼ 2 and 0 if k 6¼ 2.

Leakage airﬂow rates to the technical room can be obtained from system and

equation (2.19).

Less than four tracer gases

If the tracer gas is injected at only one or two location s, the corresponding

equations should be deleted. In this case, some of the airﬂow rates canno t be

determined.

If only one tracer gas is injected at location 1, merely Q

, Q

and Q

can

be measured. It is nevertheless interesting to assess three airﬂow rates in one

shot and with one tracer gas only!

When a tracer is injected just at location 2, Q

and Q

only can be

measured.

If tracer 4 is not used, leakage from the technical room into the unit cannot

be measured. Large leakage can nevertheless be detected from unexpected

dilution of the other tracer gases in the unit.

If tracer 3 is not used, Q

, aliased with several leakage ﬂow rates (its value

includes a linear combination of parasitic airﬂow rates), can nevertheless be

calculated from:



þ Q

 Q



1 þ

 C



 C



¼ Q

þ Q

¼ Q

 C

ð2:53Þ

with

Q

ﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ

Q

þ Q

TðP; 1Þ

ðC

 C

ﬃﬃﬃﬃﬃﬃ

ð2:54Þ

where

¼ðC

 C

ðC

 C

Q

þ Q

½ðC

 C

C

þðC

 C

C

þðC

 C

C



In this equation, k ¼ 2 is recommended.

32 Ventilation and Airﬂow in Buildings

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