3.6 Air Speed Measurement
81
3
1
2
Q 1
Q 3
Q 2
Q v = Q 1 +Q 2 + Q 3
Main Fan
Airlock
Fig. 3.15 Detecting leaks in airlocks
Hence, in the airlock itself Eq. 3.13 applies:
Q 3 =
q
q
1
c 3
−
1
c 2
(3.13)
3.7 Measurements in Ducts
Although some of the equipment used for measurements in galleries can also be used
in ducts, the two commonest devices for measurements in ducts are static pressure
probes and Pitot tubes (Fig. 3.16). Further information about their fundamentals can
be found in Sect. 1.3.5.
P s
P T
P atm
a)
b)
Fig. 3.16 a Static pressure probe and b Pitot tube
81
3
1
2
Q 1
Q 3
Q 2
Q v = Q 1 +Q 2 + Q 3
Main Fan
Airlock
Fig. 3.15 Detecting leaks in airlocks
Hence, in the airlock itself Eq. 3.13 applies:
Q 3 =
q
q
1
c 3
−
1
c 2
(3.13)
3.7 Measurements in Ducts
Although some of the equipment used for measurements in galleries can also be used
in ducts, the two commonest devices for measurements in ducts are static pressure
probes and Pitot tubes (Fig. 3.16). Further information about their fundamentals can
be found in Sect. 1.3.5.
P s
P T
P atm
a)
b)
Fig. 3.16 a Static pressure probe and b Pitot tube