## Calculatiopn of Efficiency

### ABSOLUTE FILTERS

INSTRUMENT USED FOR PARTICLE COUNT : MET ONE

INLET READING FOR 0.3 MICR3ONS :

BLUE LINE ENTERPRISES, COLOMBO

MODEL 237 B OF 0.1 CFM. MAKE: MAKE

427233 (X) COMMON FOR ALL FILTERS

FILTER SERIAL NO.OUTLET READING AFTER FILTER FOR 0.3 MICRONS (Y)EFFIENCY, E=(X-Y) x100/XREMARKS
1 4 E=(427233-4)/427233=99.99% OK
2 1 E=(427233-1)/427233=99.99% OK
3 7 E=(427233-7)/427233=99,99% OK
4 3 E=(427233-3)/427233=99.99% OK

NOTE:- ALLTHE FILTERS WERE SERIALLY NUMBERED &TESTED. TEST REPORT IS PASTED ON FILTER ITSELF.

#### Selection of filter media

(A) Rated capacity, Where,
Q = V xA,
V= RFV, Rough Face Velocity, as measured, FPM, ( Feet per Minute
A= Filter face area, Sq. Ft,

(B) I.P.D Initial Pressure Drop, Where,
P= (P2- P1), mm WG
P1= Pressure at air entry side of filter , mm WG
P2= Pressure at air exit side of filter, mm WG

#### (A) Selection of media

Pleat depth, d= 50 mm
Pleat size, = 100mm
No of pleats per ft = 11 folds per RFT.
Calculations for filter size, 600x 600 x50 mm
No of pleats (Folds ) in 600 mm = 0.600 *11*3.28=21.64 nos. say 22 nos
Allowing for one fold at each end of media extra for clamping/ fixing to frame.
No of folds in panel = 24 nos.
Length of media =24x0.100= 2.4 RM or 2.4x 3.28 = 7.87 RFT
Area of filter media = width of panel x Running Length of media
= 0.600 M x 2.4 RM = 1.44 M3, or 1.44 x 3.28x3.28
= 1.44 x 10.76 sq ft
= 15.49 sq. ft.

We select HIGH LOFT FILTER MEDIA , quality 269 F, polyester , having Air Permeability of 7000 CMH/ SQ. M at 5.0 mm W G.

Face Velocity

Required face velocity
= 7000/60x60 : 0,600x0.600
= 1.95 :.36
= 5.27 m/s

= 500 FPM ( feet per minute )
= 500 : 3.28 X 60 = 2.54 m/s
Hence media selected is ok

#### NUMBER OF PLEATES

1.0 : Input information
Area to be provided, A - Ft2
VOLUME of air flow required, V- FT3, at initial pressure drop , P1
2.0 size of filter panel, say 24”x 24”X6”
3.0 area=24x 24/144=4 sq. ft
4.0 filtration area = 55 sq.ft , or 55/(3.28X3.28)= 5.11 sq. mt
approximate no of pleats
filtration area= 5.. sq. mt
width of panel= 24” or 610 mm or 0.61 mt
area = width x runnining length of media,L,
5.11 = 0.61 x L
There fore , L= 5.11/0.61=8.38 mt
Depth of filter panel= 6” or 0.1524 mt ,
Approximate no of spacers, S , required=L/ H or 8.38/ 0.1524= 55 nos
Approximate no of pleats, N , required= S/2 = 55 / 2 ( FOLDS ) 27 nos
Considering physical width of spacers, no of pleates should = 23 or 24 nos
Selection of filter media
Panel size = 24”x24”x6”(W x H x D )
Filtration area, + 55 sq. ft= 5.11 sq. mt. Rated capacity at 6,5 mm WG,=1700 cmh
=28.34 m3 per min
air permeabilty= 1700 cmh / 5.11 sq. mt=332 mt3/hr/mt2 at 6.5 mm WG quality select 306A a. p= 7500 mt 3/hr/ mt 2 at 5 mm wg

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