Recommended Methods to Evaluate Performance of Variable Air Volume Fume Hood Systems
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1 AIHEC VENT 2006 Recommended Methods to Evaluate Performance of Variable Air Volume Fume Hood Systems Thomas C. Smith Exposure Control Technologies, Inc.
2 Safety is the Primary Objective
3 Lab Occupancy 26% Occupied Max Flow Unoccupied Min. Flow 74%
4 VAV Ventilation Systems Modulate flow to meet user demand Reduce energy use when unoccupied Provide Increased Flexibility Leverage System Capacity (Diversity)
5 M M Lab Hood System System Controller VFD Motor Fan SC Motors Outside Air Inlet OA System Static Pressure Sensor Plenum Flow Sensor Damper Actuator LC Reheat Terminal TTW Sensor HC Sash Sensor GX THINK SAFETY 100% Outside Air Supply LAB OFFICE AHU Chemical Hoods Local Exhaust Hoods
6 Types of VAV Systems Two Position (Two State Control - TSC) Occupied Unoccupied Full VAV Demand Based on Sash Opening Area Hybrid VAV with Night Setback Occupied - Sash Position Unoccupied Sash Position and Time Based
7 100 Qex (Occupied) Qex (Un-Occupied) Flow Controller BAS Damper Flow Sensor Hood Monitor 100 Hood Monitor Sash Open Sash Closed Hood Hood
8 VAV Sash Sensor Control
9 TTW Velocity Sensor and Monitor
10 Zone Occupancy Sensor Sash Sensor / Monitor
11 VAV Response and Flow Stability Test Flow Sensor Method A Data Logger Method B Velocity Probe in plane of bottom slot where Slot Velocity is proportional to Flow
12 Flow - cfm Flow Response - Sash Movement Not Repeatable Time - seconds cfm
13 Flow Response - Sash Movement Repeatable Flow - cfm Time - seconds cfm
14 Measure Flow, Face Velocity, Room Drafts and Containment Tracer Gas Ejector T Tracer Gas Detector Mannequin HoodPRO DAQ Software Face Flow Velocity / Velocity Probe Cross Draft Probe
15 Escape VAV Response Due to Slow To Sash Response Movement Speed ~ 15 Seconds Escape Flow Response Time - Seconds Escape - ppm Flow Response Tracer Gas - ppm
16 Escape Due to Flow Fluctuations BZ Conc. - ppm Flow Fluctuation Escape Flow - cfm Time - Seconds BZ Conc. Flow
17 Factors Affecting Hood Containment Flow Volumes (Face Velocity) Sash Open Sash Closed Speed of Response Flow Stability
18 100 Qt - Transfer Air Qs - Supply Occupied Qex = Qs + Qt Qt Qex -Exhaust Occupied Qs - Supply Un-Occupied Qex - Exhaust Un-Occupied BAS Flow Sensor Damper Actuator Hot Water Valve M Flow Sensor + Damper Reheat Terminal Supply Diffuser Qs General Exhaust Qgx Qhex Qt Light Switch 72 Thermostat Hood
19 100 Lab Environment Tests Flow Sensor Damper Actuator Flow Sensor Damper Actuator BAS Air Supply Flow Sensor Damper Actuator M Reheat Terminal Supply Diffuser General Exhaust Hood Sash Sensor Door Interlock Light Switch 72 Thermostat - dp - dp
20 Differential Pressure & Temperature When Changing Flow Setpoints Occupied Occupied Flow Offset ~ 200 cfm Offset ~ 200 cfm Unoccupied Unoccupied Flow Offset ~ 50 cfm Offset ~ 50 cfm Differential Pressure - "w.g Room Temperature (f) Mode Change Time - seconds Service Corridor E-362 Office Temp
21 M M Occupied Volume Un-Occupied Volume BAS Fans VFD Motors AHUs OA Outside Air Inlet System Static Pressure Sensors Exhaust Supply Flow Sensor Damper Actuator Reheat Terminal Chemical Hoods HC VAV GX THINK SAFETY LEV LAB OFFICE
22 Air Handler Variable Frequency Drive
23 Exhaust Fans Outside Air Bypass Outside Air Bypass Inlet
24 System Operating Mode Tests - SOMT Purpose Establish Operational Boundary Conditions Full Occupied to Full Unoccupied Procedure Initiate BAS Trends Place all labs in unoccupied mode Measure system flow and record operating parameters Sequentially initiate occupied mode for each lab Measure system flow and record operating parameters Analyze and Record Exhaust Fan and Supply AHU (VFD, Flow, Amps, SPs, etc.) Lab Flow Controllers ( Flow, Damper%, etc.)
25 5.0 System Operating Mode Test (SOMT) BAS Trend - Building B 4.5 Number of Units Operating Un-Occupied 81,000 cfm Occupied 117,500 cfm :00 PM 6:28 PM 6:57 PM 7:26 PM 7:55 PM 8:24 PM 8:52 PM 9:21 PM 9:50 PM 10:19 PM 10:48 PM Time of Day No. AHUs Operating No. Ex. Fans Operating
26 BAS Occupancy Trend for Building B - August 1-7, 2005 Percent (%) of Occupancy Friday Thursday Sunday Saturday Overall Average Occupancy = 41% Max Occupancy = 71% Min Occupancy = 18% 6am Time of Day 9am 12pm 3pm 6pm Tuesday Monday Wednesday Day of Week
27 BAS Trends to Optimize System Operation Initial Tuning Final No. of Units Operating System SP "w.g. AHUs Operating Exhaust Fans Operating SUP Avg Static Exh Avg Static
28 Recommendations for Ensuring Proper Operation of VAV Hood Systems 1. Conduct a Comprehensive System Analysis 2. Determine Hood, Lab and System Operating Specifications 3. Conduct VAV Hood Tests 4. Conduct Lab Environment Tests 5. Conduct System Operating Mode Tests 6. Calibrate and Tune Sensors and Controls 7. Use the Building Automation System for Operations Management
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