Variability in 52.2 Testing

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Presentation transcript:

Variability in 52.2 Testing Monroe A. Britt NAFA TECH2008 Memphis, TN April 18, 2008

Topics 52.2 -- Same type filters at different labs 52.2 -- Same type filters at same lab 52.2 Conditioning Step -- Same type filters at different labs 52.2 Conditioning Step – Different type filters at one lab

Lab Test Program Program not planned as “Round Robin”, but as typical requirement to occasionally have an independent lab test report for verification of in-house test ------- program grew as results came in Initial 52.2 – no dust feed Proposed 52.2 Conditioning Procedure

Same Type Filters at Different Labs Two Sets -- 19 pleat and 28 pleat Synthetic Media - uncharged All Filters made with same roll of media on same equipment by same people on same morning (Manufacturing Identical) Properties of media checked through out media roll using typical QC procedures Filters were not individually tested before sending to Labs

Same Type Filters at Different Labs -- 24 x 24 x 2 Pleat Filter Two Versions : 19 Pleat and 28 Pleat

Laboratories Air Filter Testing Laboratory Blue Heaven Technologies Clarcor Air Filtration – Site 1 Clarcor Air Filtration – Site 2 IBR Intertek LMS Research Triangle Institute

19 Pleat Filters Clean Resistance - Inches wg Laboratory Air Flow- CFM D # 1 D # 2 A B G H C # 1 C # 2 492 0.04 0.06 0.05 984 0.16 0.14 0.15 0.12 0.11 1476 0.27 0.25 0.23 0.26 0.20 0.18 1968 0.40 0.38 0.36 0.37 0.58 0.30 2460 0.56 0.53 0.52 0.55

19 Pleat Filters Initial 52.2 Efficiencies Laboratory E F # 1 F # 2 Particle Size E F # 1 F # 2 D # 1 D # 2 A B G H C # 1 C # 2 0.35 1.6 7.0 2.7 1.7 0.0 10.1 0.8 1.8 0.47 5 15.9 23.0 7.4 5.4 14.3 2.5 10.4 5.7 0.62 14 31.3 25.0 18.9 15.1 5.5 22.0 12.2 35.3 27.6 0.84 25 42.0 34.0 33.3 28.8 24.4 32.0 30.3 50.0 41.6 1.14 37 50.5 44.0 45.6 40.8 46.7 43.3 49.0 39.5 58.0 49.8 1.44 49 57.6 55.0 49.1 56.5 52.5 59.3 43.8 62.8 53.8 1.88 55 67.3 67.0 63.0 58.2 65.6 60.3 68.6 68.8 2.57 61 74.0 73.0 70.0 74.3 69.8 76.6 56.4 75.6 68.1 3.46 64 75.0 73.3 70.9 78.6 77.0 78.1 60.9 79.5 75.2 4.69 63 75.4 72.0 75.9 72.9 80.3 81.8 77.9 64.2 82.1 78.5 6.2 58 75.5 76.4 73.7 80.7 86.0 82.0 82.8 80.2 8.37 56 79.4 76.9 74.2 86.6 75.1 83.4 81.4

Laboratory F

Laboratory D

Laboratory C

Comments on 52.2 Test Data

ASHRAE 52.2 KCl Conditioning Procedure Feed very large concentration (106 particles/cm3) of very fine KCl particles (less than 0.1 microns) until: a. Efficiencies meet “convergence” criteria, or b. Total “particle concentration times time” (CT) reaches pre-determined limit (109 particles/cm3 – minute)

Laskin Nozzle Sub-micron Particle Generator

Laskin Nozzle Particle Injection Into Duct

Condensation Particle Counter

Typical Conditioning Curves

Proposed 52.2 Conditioning Step Efficiencies 19 Pleat Filters Proposed 52.2 Conditioning Step Efficiencies Particle Size Laboratory E F # 1 F # 2 D # 1 D # 2 A n/a H C # 2 (IPA) 0.35 0.9 1.4 1.1 0.0 0.47 6 9.1 6.6 4.8 3.5 2.6 3.7 0.62 14 16.6 19.6 16.3 10.8 10.3 11.7 0.84 20 24.8 24.9 30.8 23.4 28.8 23.2 1.14 34 31.9 32.0 43.4 33.3 49.5 34.8 1.44 39 43.6 44.1 49.0 41.9 56.5 31.4 42.6 1.88 45 54.9 60.5 54.0 53.2 65.8 44.0 49.8 2.57 52 62.6 63.0 59.0 63.5 74.9 49.9 59.7 3.46 53 66.3 63.2 62.0 67.8 79.0 56.3 71.9 4.69 65.4 54.5 63.6 70.0 80.5 62.2 77.5 6.2 49 48.9 66.5 71.4 80.1 65.7 79.8 8.37 42 63.9 43.0 65.5 72.0 80.6 69.2 79.5

Laboratory A

Laboratory C – Filter 2

Laboratory D – Filter 1

Laboratory D – Filter 2

Laboratory E

Laboratory F – Filter 1

Laboratory F – Filter 2

Initial Resistance - In. WG 19 Pleat -- Summary Lab No. of Pleats Filter Initial Resistance - In. WG E1 - % E2 - % E3- % MERV Comments Lab A 19 1 0.37 7 61 80 8 As Received 10 62 After 52.2 Conditioning Lab B 20 57 83 Lab C 0.27 58 79 47 77 After IPA Treatment 2 0.30 24 66 82 Lab D 16 76 13 51 64 54 73 48 70.3 Lab E 0.40 11 60 9 42 6 Lab F 0.38 22 49 52 23 65 Lab G   63 Lab H 0.58 --- 67 0.65 38

28 Pleat Filters Lab Clean Resistance - In. wg E F D A B G H C # 1 Air Flow - Cfm E F D A B G H C # 1 C # 2 492 0.03 0.05 0.04 984 0.13 0.09 0.10 0.12 0.11 1476 0.21 0.19 0.18 0.20 0.16 1968 0.33 0.32 0.34 0.28 0.31 0.93 0.24 0.26 2460 0.47 0.52 0.40 0.43 0.44 0.35

28 Pleat Filters Initial 52.2 Efficiency Laboratory E F D A B G H Particle Size E F D A B G H C # 1 C # 2 0.35 2 1.6 2.5 0.0 7.5 0.1 2.7 0.47 3 18.1 5.8 9.8 10.1 7.1 0.62 9 30.3 12.6 15.6 .6.7 26.3 29.4 0.84 19 41.5 23.3 9.7 23.9 19.4 38.8 43.4 1.14 32 45.2 35.3 31.8 35.2 35.0 47.9 47.2 50.6 1.44 42 56.6 43.9 42.9 41.2 51.9 53.0 54.7 1.88 52 65.1 54.0 54.8 51.6 57.7 56.8 60.1 60.6 2.57 59 73.6 64.3 69.3 64.2 71.2 61.9 68.6 68.1 3.46 66 77.2 70.1 79.4 71.8 78.1 65.2 75.7 76.2 4.69 68 77.7 72.3 82.2 80.4 81.4 70.9 80.8 6.20 67 76.7 84.9 85.1 85.9 75.1 84.6 82.8 8.37 72.9 74.2 82.4 89.6 92.7 82.7 86.2 85.2

Laboratory C

28 Pleat Filters Laboratory 0.35 2 0.5 1.5 0.0 --- 0.47 3 13.0 4.0 0.3 52.2 Conditioning Test Results Laboratory Particle Size E F D A B G H C # 1 C # 2 (IPA) 0.35 2 0.5 1.5 0.0 --- 0.47 3 13.0 4.0 0.3 0.62 9 20.8 10.1 6.8 0.84 17 26.1 21.4 9.5 18.0 1.14 28 34.6 31.8 31.6 39.6 29.0 1.44 36 44.9 41.5 43.7 43.1 36.9 1.88 43 57.2 50.9 58.9 48.6 43.5 2.57 53 69.7 60.7 74.7 56.0 53.3 3.46 56 75.3 67.2 84.7 62.3 67.5 4.69 72.4 69.4 91.0 68.0 77.4 6.2 72.3 70.6 92.9 71.4 79.5 8.37 49 64.7 71.3 86.0 79.3 79.8

Initial Resistance - In. WG 28 Pleat -- Summary Lab No. of Pleats Filter Initial Resistance - In. WG E1 - % E2 - % E3- % MERV Comments Lab A 28 1 0.28 2 50 82 8 As Received 52 89 (9) After 52.2 Conditioning Lab B 0.31 14 48 Lab C 0.26 20 59 81 As received 6 41 76 After IPA Soak 0.24 19 57 Lab D 0.35 11 49 73 9 46 69.6 7 Lab E 0.33 65 40 54 Lab F 0.32 23 60 71 Lab G 85 Lab H 0.93 --- 55 0.99 47 70.3

Comments on 52.2 Conditioning Step

Different Filters at Same Lab 52.2 Conditioning Step Different Filters at Same Lab

  24 x 24 x 2 – Cotton/Poly

  24 x 24 x 2 – Cotton/Poly #2

  24 x 24 x 2 – Fiberglass

  24 x 24 x 12 – Fiberglass

24 x 24 x 2 – Uncharged Synthetic   24 x 24 x 2 – Uncharged Synthetic

24 x 24 x 2 – Uncharged Synthetic #2   24 x 24 x 2 – Uncharged Synthetic #2

  24 x 24 x 2 – Charged Synthetic

24 x 24 x 2 – Charged Synthetic #2   24 x 24 x 2 – Charged Synthetic #2

24 x 24 x 2 – Charged Synthetic #3   24 x 24 x 2 – Charged Synthetic #3

24 x 24 x 2 – Charged Synthetic #4   24 x 24 x 2 – Charged Synthetic #4

  24 x 24 x 4 – Synthetic

Summary Chart

End Questions ??

Comments on Dust Holding Capacity - DHC

ASHRAE 52.1 -- DHC Comments on Limitations of Test Results “Since the contaminant used for loading is not typical of natural atmospheric dust, its effects on the filter may not be the same as an equal amount of atmospheric dust.” “The performance values obtained in accordance with the standard cannot be used by themselves to predict the air cleanliness of a specific ventilated space or the service life of an installed filter.” “Testing accelerates the life experience of a filter and accelerated usage is not the same as normal usage.” “ASHRAE dust-holding capacity ….. Is felt by some users to be a measure of relative filter life, but the result can be manipulated advertently or inadvertently during the test.”

EN-779 – Dust Loading

Draft ISO Standard – Dust Loading

Conclusions and Recommendations

Flat Sheet Test Data

IPA Flat Sheet Test – Lab C

IPA Flat Sheet Test – Lab D

IPA Flat Sheet Test – Lab C & D Lab C – 110 FPM --– Lab D - 18 FPM