Safe, Dependable and Energy Efficient Laboratories 8-13 Demand for Laboratory Ventilation • Operating Mode • Min and Max Flow • Temperature Control • Dilution – ACH • Air Change Effectiveness • Room Pressure • Transfer Volume - + Room Pressure Qt = Qe – Qs Qt = Constant Qe - Exhaust
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Demand for Laboratory Ventilation - RPIC-IBIC€¦ · Safe, Dependable and Energy Efficient Laboratories 8-13 Demand for Laboratory Ventilation • Operating Mode • Min and Max
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Safe, Dependable and Energy Efficient Laboratories 8-13
Demand for Laboratory Ventilation
• Operating Mode
• Min and Max Flow
• Temperature Control
• Dilution – ACH
• Air Change Effectiveness
• Room Pressure
• Transfer Volume
-+Room Pressure
Qt = Qe – Qs Qt = Constant
Qe - Exhaust
Safe, Dependable and Energy Efficient Laboratories 8-13
Emissions in Labs Requiring Dilution • Escape from Lab Hoods
• Improper Bench Top Procedures
• Unventilated Equipment
• Fugitive Emissions
– Chemical Bottles & Containers
– Gas Cylinders
• Accidental Spills
Typical Genera,on Rates
<0.1 lpm to 10 lpm
Catastrophic Failure of a Gas Cylinder
1400 lpm
Safe, Dependable and Energy Efficient Laboratories 8-13
Specifying Airflow Rates for Labs Air Change Rate (ACH)?
• Develop & Assign Control Bands
– Evaluate hazardous emissions
– Use appropriate laboratory hoods
– Capture hazards at the source
• Base airflow rates on:
– Hood Exhaust Requirements
– IAQ Requirements
– Pressurization/Isolation
– Comfort (Temperature)
Safe, Dependable and Energy Efficient Laboratories 8-13
System Operating Specifications Energy Savings
Require Reducing Total Building Flow
• Max and Min Flows
• AHUs and Ex. Fans
• Manifolds
─ Redundancy
─ Emergency Power
• System Static Pressure
• Duct Transport Velocity
• Exhaust Stack Discharge
• Control Capabilities
─ VAV Diversity
─ VAV Sensitivity
Safe, Dependable and Energy Efficient Laboratories 8-13
System Operating Mode Tests (SOMT)
SOMT Data Collection
• Operating Modes
o Sashes Closed - Unoccupied
o Sashes Open – Occupied
• Measure Total Flow and SP
• BAS Trend AHUs & Ex. Fans
• Record Terminal Boxes
o Flow Set Point
o BAS Flow
o Damper %
Safe, Dependable and Energy Efficient Laboratories 8-13