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I need Details.
Calculating CFM of AHU or FCU
we have to calculate the Air flow vleocity of AHU filtrs let suppos we have 4 filters in AHU A,B,C,D
Take Air flow velocity by anemometer for each filter like for A filter we take reading from 5 points at the 4 corners and from center of filter for example (A1,A2,A3,A4,A5)
Filter A AFV is
A1=20,A2=30,A3=25,A4=35,A5=40
A=A1+A2+A3+A4+A5
A=150/5=30
Multiply the results with factor consider at anemometer selector switch let suppos 10 multipl factor
A=30*10=300
as it is for other filters
B filter
B1=10,B2=15,B3=20,B4=25,B5=30
B=100/5=20
B=20*10=200
C FILTER
C1=10,C2=20,C3=10,C4=20,C5=30
C=90/5=18
C=18*10=180
D FILTER
D1=10,D2=15,D3=20,D4=25,D5=30
D=100/5=20
D=20*10=200
TOTAL AFV OF FILTERS =A+B+C+D
AFV=880 CUBIC PER MINUT
TOATAL SQUARE FOOT OF FILTER=AREA OF =A+B+C+D
AREA = 20
CFM = AFV X AREA
CFM =880 X 20 = 17600 CFM
THANKS
