Selection Software

Selection Software

AIR CLEANERS FOR PARTICULATE CONTAMINATIONS

COMPLETE AIR CLEANIG MAY REQUIRE THE REMOVAL OF

  • INERT PARTCLES
  • MICRO-ORGANISM
  • AND GASEOUS POLLUTANTS

WE DEAL IN REMOVAL OF INERT PARTCLESAND MICRO-ORGANISM ONLY.

RATING OF AIR CLEANERS

AIR FILTERS ARE SELECTED ON THE BASIS OF THREE OPERATING CHARACTERISTICS

  • EFFICIENCY
  • AIR FLOW RESISTANCE , AND
  • DUST HOLDING CAPACITY

INITIAL (CLEAN FILTER) EEFICIENCY SHOULD B CONSIDERD FOR DESIGN

SELECTION OF AIR FILTERS

SELECTION OF AIR FILTERS IS DONE FOR : 0.03, 5, 10, OR 20 MICRONS FILTRATION EFFICIENCY FROM CATALOGUE WHICH GIVES RATED AIR FLOW IN CFM AGISNT INITIAL PRESSURE DROP ( CLEAN FILTER ) IN MM WG

PARTICLE SIZE EFFICIENCY

ATMOSPHERIC DUST IS FED TO THE FILTER, AND NUMBER OF PARTICLES PRESENT IN AIR BEFORE AND AFTER THE FILTER IS MEASURED BY A PARTICLE COUNTER AND EFFICIENCY AGAINST A PARTICLE SIZE IS OBTAINED.

AIR CLEANER TEST METHODS

  • EN-779
  • B.S. 2831/B.S.6540
  • ASHRAE: 52-76
  • Fed. 209 D with cold D.O.P.

(I) STANDARD EN 779
(supersedes DIN 24185 – 1: 1980-10 : and DIN 24185 – 2:1980-10)

European Standard EN 779 : 1994 has the status of a DIN Standard

Initial dust spot efficiency ( E a ) Ea < 20 % Ea> 20 %
Characteristics Average arrestance Am ( % ) Average efficiency Em ( % )
Filter group Filter Class Class Limits
Coarse G-1
G-2
G-3
G-4
Am< 65
65 < Am < 80
80 < Am < 90
< 90Am
---
Fine F-5
F-6
F-7
F-8
F-9
-
-
-
-
-
40 < E m < 60
60 < E m < 80
80 < E m < 90
90< E m <95
95< E m

Filters are classified according to their performance ( average synthetic dust weight arrestance or average atmospheric dust spot efficiency . Atmospheric dust spot efficiency, E ( % ) is given by :
E= 100 [ 1- Q1/Q 2 x O2/ O1 ) ]
P. S refer Page 15 for details

(2) EFFICIENCY TEST AS PER BS -6540 PART -1

TEST DUST: SYNTHETIC

  • S.NO. OF FILTER TESTED :AFF 1250/866
  • S. NO. OF HEPA FILTER (FINAL FLTER USED IN TEST:200200
  • FITER SIZE: 610x610x 150 MM
  • NO OF FOLDS :15
  • PLEAT DEPTH : 145 MM:
  • ASTHETICS & END SEAL CHECKED : OK 100 %
  • THE STICHING FOUND TO BE SATISFACTORY AND ASRTHETICALLY FOUND OK.
  • GSM OF MEDIA OBSERVED AS 103.95 GRAM/SQ. M.
  • G.I. WIRE NETTING ( JALI ) BACKIN HAS BEEN USED.

S.NO. OF TEST FILTER :AFF 1250/866

PRESSURE DROP Vs. FLOW RATE:

Sr. No.FLOW RATE PRESSURE DROP
(IN MM WG )
PRESSURE DROP
(IN MM WG )
PRESSURE DROP ACROSS
TEST FILTER IN
CLEAN CONDITION ( MM W. G. )
  CMH CFM    
1 402.5 236,7 15 1
2 805 473.5 30 2
3 1207.5 710.2 49 3
4 1610 947 72 4

SYNTHETIC DUST WEIGHT ARESTANCE TEST

Sr. No.WEWIGHT OF FINAL FILTER (GRAMS)GAIN IN WT. OFFINAL FILTER( GRAMS )DUST FED (RAMS)DUST FED (RAMS)PRESSURE DROP ACOSS TEST FILTERARRESTANCE ( % 0 )
  INITIAL FINAL        
1 4582 -- -- -- 3 --
2 4582 4587 5 30 3 87
3 4587 4591 4 67.5 6 88
4 4591 4593 2 67.5 8 88
5 4593 4596 3 67.5 9 89
6 4596 4598 2 67.5 12 90

ARRESTANCE = 1 – [CUMULATIVE GAIN IN WT. OF FINAL FILTER / CUMULATIVE DUST FED ]

AVERAGE SYNTHETIC DUST WEIGHT ARRESTANCE (Am )
  • Am = ( A1W1+A5W5 ) / W = ( 87x 30+90x67.5) /300 = (2610+6075 ) / 300 =88.58
  • A1 = 87 W1 = 30 A1 W1== 2610
  • A2 = 88 W2 = 67.5 A2W2= 5940
  • A3 = 88 W3 = 67.5 A3 W3 =5940
  • A4 = 89 W4 = 67.5 A4 W4 = 6007.5
  • A5 = 90 W5 = 67.5 A5 W5 =6075 W= 300 REMARKS ; TEST SATISFACTORY

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