Speaker: Don Fedyk - NEBB...Speaker: Don Fedyk . Proposing a New Tracer Gas for Fume ... Fume Hood...
Transcript of Speaker: Don Fedyk - NEBB...Speaker: Don Fedyk . Proposing a New Tracer Gas for Fume ... Fume Hood...
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Speaker: Don Fedyk
Proposing a New Tracer Gas for Fume
Hood Testing
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Member, NEBB Board of Directors Chairman, NEBB FHT Committee
MY DAY JOB
Manager Air Filtration Management - NY Fume Hood Testing
Cleanroom Validation
Environmental Systems Testing/Balancing
Building System Commissioning
Sound & Vibration Testing
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The awareness by World Community of the dangers of Climate Change has created a new focus for our industry. We are looking for new & innovative ideas for energy conservation as well as reducing the introduction of GREEN HOUSE GASES.
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ESTABLISHMENT OF A COMMITTEE
Development of ASHRAE RP-1573, "Determination of suitable replacement for
SF6 when used as a tracer gas in accordance with ANSI/ASHRAE Standard 110."
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FHT Program
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The FHT Programs at NEBB and ASHRAE are pursuing a tracer gas
that will not cause an environmental “disaster” while allowing us to verify
the efficiency and safety of laboratory and research enclosures
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What is NEBB?
Proven leader in providing technical expertise for
Research and Technological Environmental Systems.
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Providing the expertise to attain the maximum efficiency without
sacrificing safety in the Built Environment
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NEBB’s Involvement
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While FUME HOOD TESTING is one area of involvement for NEBB, continued research and development for the rapidly growing healthcare
industries will require the expertise available from all our NEBB Certified Professionals (CP’s) and
Technicians (CT’s) .
Besides providing a safer environment, we are able to promote the competency of our
organization and provide a viable opportunity for NEBB firms and CP’s
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1 LABORATORIES
2
3
FUME HOODS
CLEANROOMS
4 AN ENDLESS LIST OF HAZARDOUS ENVIRONMENTS
Testing
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Each requires a different set
of rules!
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Performance Evaluation
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The performance of an exposure control device is ultimately determined by its ability to control exposure to within applicable standards or other safe limits.
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Exposure Control Devices
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There are numerous exposure control devices including:
• Local exhaust hoods, and other ventilated enclosures
• Glove boxes
• Biological Safety Cabinets (BSC)
• Laboratory Fume Hoods
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REALIZATION
TESTING IS FOR SAFETY
PROVING THE CONTAINMENT
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ANSI/ASHRAE 110-1995
The purpose of this standard is to specify a quantitative & qualitative test method for
evaluating the containment of a laboratory fume hood.
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This method of testing applies to conventional, bypass, auxiliary air, and
VAV laboratory fume hoods.
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Meeting the Need!
NEBB is stepping up to meet the needs in all AREAS.
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Continuation and enhancement of the training available not just for our CP’s and
CT’s but for the clients and future customers to gain a better understanding
of the role NEBB can play.
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NEBB FHT Procedural Standard
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Establish a uniform and systematic set of criteria for the performance
testing of fume hoods.
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Task Analysis
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Prior to the start of any project, whether FHT, CPT, TAB, etc. a task
analysis should be performed.
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Collection of Information
Test Requirements
Instrumentation
Submittals
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Preparation for Testing
Verify Test Procedures
Acquisition of Instrumentation
Mobilization Strategy
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Task Analysis
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Discipline Specific
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Fume Hood Performance Testing
Verify System Type
Verify System Readiness
Establish Test Matrices
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FHT Velocity
Hot-wire Anemometer!
Evaluate Results
Test Setup
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Evaluation
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Velocity is not an indicator of containment.
It verifies the uniformity of the intake as well as provides a
baseline for future evaluation.
Then why measure velocity?
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Instrumentation
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Temperature compensation
Data logging and Averaging
Individual point readings
One-second readings
Hot-wire Anemometer
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FHT Visualization
Evaluate Results
Evaluate Results
Major Challenge
Local Challenge
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FHT Tracer Gas
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FHT Tracer Gas
Test Setup
Evaluate Results
Ejector
Analyzer
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Instrumentation
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Placement
Field Verification Electronic flow meter / Bubble gauge
Specifications ASHRAE 110 / NEBB FHT PS
Ejector
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Instrumentation
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Analyzer
Instrument List ASHRAE 110 / NEBB FHT PS
Field Verification Instrument dependent
One-second data logging downloadable to computer for analysis and reporting
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Instrumentation
Analyzers
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Instrumentation
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Really low readings!
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Analyzer / Calibrator
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The Other Analyzer
34 Leak Meter
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Where does exhaust go?
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Where does exhaust go?
36 Through these!
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Fume Hood Testing
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It is not just taking reading at the fume hood
You have to understand the entire
system
Fans, Filters, Controls, Etc.
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NEBB
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Continuing Education and Research helps promote the knowledge and
invigorate the CP’s and CT’s to attain …….
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Computer Modeling
A major tool in the development of a more efficient laboratory as well as for containment vessels.
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Plan View – Velocity Vectors (fpm)
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Isometric Close-up – Velocity Vectors (fpm)
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Isometric Close-up – SF6 Isosurfaces @ 0.05ppm
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Summary of properties of FM200: Molecular Weight: 170.04 g/mole Molecular Formula: C3-H-F7 Boiling Point/Condensation: 15.6C (3.9F) Critical Temperature: 101.6C (214.9F) Vapor Pressure: 67 (PSIG) Specific Volume (ft3/lb): 18.9753 Gas Density (lb/ft3): 0.0527
Comparison of the spectra of FM200 and SF6
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We finally had a chance to run the Case B fume hood using FM200 gas. The molecular weight for FM200 is around 175 and SF6 is around 146, therefore the FM200 will be about 20% more massive per liter of gas. We used equivalent mass as the injection rate not 4 LPM.
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The FM200 concentrations are more spread out in the hood compared to SF6 even correcting for mass. May what to reduce the rate slightly more to achieve equal challenge.
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FM200_pathlines
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N2O_pathlines
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CaseB_shortperson_FM200_3Dview_isosurface
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CaseB_shortperson_FM200_3Dview_isosurface2
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CaseB_shortperson_FM200_3Dview_zoom_isosurface
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CaseB_shortperson_FM200_full_side_Concentrations
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CaseB_shortperson_FM200_zoom_side_Concentrations
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CaseB_shortperson_FM200_zoom_side_velocity
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CaseB_shortperson_FM200_zoom_side_vorticity
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FM200_ppm_3-5ft
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N2O_ppm_3-5ft
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FM200_ppm_5ft
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What have we learned?
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The CFD modeling indicates that the
secondary side wall vortex's do not trap
lighter gas equal to heavier than gas.
All our testing have been with the
heavier gas so switching to a lighter
gas reduces the tracer gas challenge.
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By using CFD modeling we can determine exactly the
rate of heavier FM200 we will need to = SF6. The added
benefit we will be using less gas which is heavier.
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NEBB Disciplines
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The constant changing technology requires each of the NEBB CP’s and
CT’s to persistently pursue the knowledge to maintain the preeminence of the NEBB’s
Leadership Role in the Industry.
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Questions or comments?