testing fan filter units monroe a. britt manager, research & technology clarcor air filtration...
TRANSCRIPT
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Testing Fan Filter Units
Monroe A. BrittManager, Research & Technology
Clarcor Air Filtration ProductsLouisville, KY
502 969 2304 x1260 -- [email protected]
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Testing Fan Filter Units
Objectives• To develop procedure for testing Fan Filter
Units that will be recognized and used by manufacturers, consultants, contractors, and end-users
• IEST has formed tentative Working Group to prepare Recommended Practice for publication
• First Meeting – Held November 4, 2003, Approx 15 Attendees
• Next Meeting – April at ESTECH – Las Vegas
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Approach to Test Procedure• Develop procedures that can be readily
conducted in manufacturers facility or after installation of units in cleanrooms
• Instrumentation should be apparatus commonly used is the cleanroom industry
• Standardized Reporting Form• Conduct blind “Round Robin” test program
between various manufacturers and test labs to verify uniformity of test results
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Testing Fan Filter Units
• Physical Size -- Up to 4 Ft. x 4 Ft. Units • Test Parameters Air Flow – CFM Power (watts, amps, PF, volts) Available External Static Pressure Sound (pressure and power levels) Filter Air Velocity Uniformity - FPM Vibration
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Air Flow - CFM• Efficiency of Media -- HEPA Media, ULPA Media, ePTFE• Media Pack -- Depth of Pack & Pleat Spacing• Pre-Filters Various Efficiency Levels of Particulate Filters Gas Phase Filters• Room/Enclosure Pressurization and Exit Losses• Inlet Duct Connections & Duct Work• Height of Plenum above FFU Air Inlet• Current -- 50 or 60 Hertz• Acoustical Packages• Other Variables
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Air Flow - CFM
• Required Air Flow Expressed as Velocity -- FPM
Expressed as Volume -- CFM
• CFM = Area x FPM Area is Active Flow Area of Filter
(Typical 2 x 4 filter Without Center Bar Contains 7.15 Ft2 of Active Filter Flow Area)
• CFM at 90 FPM 90 FPM X 7.15 Ft2 = 640 CFM
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Fan Filter Unit (FFU)
• FFU’s Without Constant Flow Control
AC Units
ECM Units
• FFU’s With Constant Flow Control
AC Units
ECM Units
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Air Flow - CFM vs Static Pressure
FanHousing
Filter
Flow Hood
TestPlenum
Resistance(Pre-Filter)
StaticPressureTap
Measure CFM Static Pressure Watts, Amps, PF, Volts
Watt Meter
Transition Needed For 4 x 4 FFU
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Air Flow - CFM vs External Static Pressure
Air Flow - CFM
Pre
ssu
re -
Inc
he
s W
.G.
HEPA Filter
ULPA Filter
ULPA Filterw/Pre-Filter
FFU’s w/o Constant Flow Control
No Scale
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Air Flow vs Watts
Air Flow - CFM
Po
we
r C
on
su
mp
tio
n –
Wat
ts
HEPA Filter
ULPA FilterULPA Filterw/Pre-Filter
FFU’s w/o Constant Flow Control
No Scale
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Air Flow - CFM vs External Static Pressure
Air Flow - CFM
Pre
ssu
re -
Inc
he
s W
.G.
ULPA Filter
ULPA Filterw/Pre-Filter
FFU’s with Constant Flow Control
HEPA Filter
Rated Air FlowNo Scale
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Air Flow vs Watts
Air Flow - CFM
Po
we
r C
on
su
mp
tio
n –
Wat
ts
HEPA Filter
ULPA FilterULPA Filterw/Pre-Filter
FFU’s with Constant Flow Control
No Scale
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Air Flow---Power---Static Pressure
Minimum Reporting Data• Complete Description of Fan Unit, Final
Filter, and Pre-Filter -- Part Numbers, Construction Codes, etc
• Nominal Rated Air Flow Air Flow - CFM Watts, Amps, Power Factor, Volts, Hertz Available External Static Pressure Dimensions and Active Filter Flow Area
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Sound Pressure and Power Levels
• Background Levels -- Recorded as First Step
• Sound Pressure Levels -- To be Measured as Overall dBA, Overall dBL, and as dBL for Octave Bands -- Used to Report Sound Levels and Establish NC Curves for One Fan Filter Unit Installed in Typical Operating Environment
• Sound Power Level -- To be Determined as Overall dB and as dB
for Octave Bands -- Used by Acoustical Engineers to Predict Sound Pressure Levels in Actual Operating Environments. These Calculations Will Consider Number of FFU’s, Location of FFU’s and Sound Characteristics of Materials, Equipment, and Other Activity in the Individual Cleanroom
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Sound Pressure LevelTest Environment --- 8 x 8 x 8 Soft Wall Room
8 Ft.
8 Ft.
3 ft.
7 Ft.MicLocation
Concrete Floor - No Covering
Acoustical Tiles
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Sound Pressure Levels Minimum Reporting Data
• Complete Description of Fan Unit, Final Filter, and Pre-Filter -- Part Numbers, Construction Codes, etc
• Nominal Rated Air Flow Background Sound Pressure - dBL & dBA
Background Octave Band Sound Pressure - dB
Overall Sound Pressures -- dBL & dBA
Octave Band Sound Pressures – dB
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Sound Power LevelTest Environment --- 8 x 8 x 8 Soft Wall Room
8 Ft.
8 Ft.
3 In.
7 Ft.
Plane of MicLocations
Concrete Floor - No Covering
Acoustical Tiles
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Sound Power Levels• Sub-divide active filter area into equal square
areas, maximum of 12” x 12”, minimum of 4 areas/filter
• Measure overall sound levels for center points• Average all sound levels measured -- LP
• Compute Sound Power Level for FFU -- LW
LW = LP + 10 Log (S1/S0) LW = Sound Power Level, dB re 10 -12 Watts LP = Sound Pressure Level, dB re 10-5 N/m2 S1 = Total Area of Measurement Surfaces - m2 S0 = 1.0 m2
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Sound Power Level
Minimum Reporting Data
• Complete Description of Fan Unit, Final Filter, and Pre-Filter -- Part Numbers, Construction Codes, etc
• Nominal Rated Air Flow
Grid with Measured Values – dB
Average of Measured Values -- dB
Calculated Overall Sound Power -- dB
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Air Velocity Uniformity
• Sub-divide active filter area into equal square areas, maximum of 12” x 12”, minimum of 4 areas/filter
• Measure center point velocity for each area at 6 inches downstream of filter or protective grid
• Take measurements for minimum of 5 seconds, using apparent average during that period as value for reporting
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Air Flow Uniformity Minimum Reporting Data• Complete Description of Fan Unit, Final
Filter, and Pre-Filter -- Part Numbers, Construction Codes, etc
• Nominal Rated Air Flow Grid with Measured Values – FPM Standard Deviation of Measured Values
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Vibration
“Site Under Construction”
Current Plans
• Mount FFU in stiff aluminum frame that
will simulate proper sized ceiling grid
• Suspend frame by flexible cables
• Measure vibrations at corner of frame
• Comments/Input Solicited
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Future Activity
• Complete “Working Draft” of Proposed RP• Develop Comprehensive Data Reporting Form• Distribute Draft to First Meeting Members and All
Interested Parties• Solicit Comments and Recommendations• IEST Working Group Next Official Meeting April 25 – 28 , 2004 Riveria -- Las Vegas, NV WG 036 Meets On April 26 at 8:00 AM