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RETROCOMMISSIONING AIR HANDLING SYSTEMS

RETROCOMMISSIONING AIR HANDLING SYSTEMS In The College of Applied Science and Technology (CAST), Building 70 Critical Design Review Presentation. Project 05306. May 13th 2005. Team Members. Mechanical Engineers Erin Colquitt (Team Leader) Joe DiSanto (Chief Engineer)

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RETROCOMMISSIONING AIR HANDLING SYSTEMS

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  1. RETROCOMMISSIONING AIR HANDLING SYSTEMS In The College of Applied Science and Technology (CAST), Building 70 Critical Design Review Presentation Project 05306 May 13th 2005

  2. Team Members • Mechanical Engineers • Erin Colquitt (Team Leader) • Joe DiSanto (Chief Engineer) • Jason Bolton (HVAC Specialist) • Dan Esposito (HVAC Specialist) • Electrical Engineer • Jimmy Liang (Electrical Specialist)

  3. Overview • Background • AHU System Components & Testing • Engineering Analysis • Retrofit Solutions

  4. Background • Commissioning • Retrocommissioning • Reviews of existing system against design specifications • Extends lifetime of components • Analyzes efficiency for comparison • Minimize energy waste

  5. Overview of SD I • Needs Assessment • Concept Development • Feasibility • Develop Initial Test Plan • Set Up Analysis

  6. Project Goals - Senior Design 2 • Complete testing with AHU1 • Corrections of test checklists • Create Excel program for data analysis • Meet with sponsor to verify the checklists and performances of AHU1 • Develop retrofit solutions

  7. Instrumentation • Digital Multimeter • Tachometer • Thermometer Probes • Digital Micromanometer • Wireless Laptop • Web Control

  8. Testing • General AHU Test • Sensor Verification • Control Response • Supply/Return Fans • Heating/Cooling Coils • Economizer

  9. General AHU Test

  10. Fan Performance Test

  11. Coil Performance Test

  12. Economizer Performance Test

  13. Thermodynamic Analysis • Mass Balance • Energy Balance • Exergy Analysis • First and Second Law Efficiencies

  14. Control Volume is around the AHU Mass flow in and out of CV Outside air Hot water Cold water Exhaust air Supply air Work into fans Steady State Air is an ideal gas Constant specific heats Incompressible flow of air No heat transfer out of CV Ignore potential and kinetic energy of air Assumptions

  15. Exergy • Potential for energy use • Steady state exergy balance • Specific Flow Exergy (ef)

  16. Economizer

  17. Economizer Analysis • Mass Balance • Energy Balance – check adiabatic assumption • 2nd Law Efficiency

  18. Heating Coil • Energy Balance • 2nd Law Efficiency • Coil Effectiveness

  19. Fan Performance • 1st Law Fan Efficiency • 2nd Law Efficiency

  20. Overall System

  21. Analysis Results

  22. Findings • Reduced Damper Range • Dirty/Clogged Airflow Sensors • Reduced Static Pressure Set Point Maintained Occupant Comfort

  23. Cost Savings • Assumptions • RIT receives a rate of electricity at 7.2cents/KWh • Two Air Handling Units are connected together • The new static pressure can be maintained for 50% of the year • Sample Calculation for reducing from 1.5 to 1 in WC Total Estimated Savings = $2,445.50/year

  24. Retrofit Solutions • Fix Dampers to operate over full range • Routinely clean WebCtrl sensors • Reduce Duct Static Pressure To 1” WC

  25. Feedback/Questions ?

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