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RETROCOMMISSIONING AIR HANDLING SYSTEMS
The Golisano College of Computing and Information Sciences, Building 70
Preliminary Design Presentation
February 18th 2005Project 05306
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)
Overview
Background Needs Assessment Concept Development & Feasibility Final Concept AHU System Components & Testing Electrical Components & Instrumentation Engineering Analysis Future Work
Background
Commissioning Retrocommissioning
Reviews of existing system against design specifications
Extends lifetime of components Analyzes efficiency for comparison Minimize energy waste
Project Goals - Senior Design 1 Understand the thermodynamic,
mechanical and electrical aspects of an air handling unit
Develop retrocommissioning plan Test procedures Instrumentation list
Needs Assessment
Sponsor Needs Develop test checklist Test system Develop retrofit solutions
Team Needs Apply engineering knowledge Gain work experience
Concept Development
Scope Format of Documents Test points Instrumentation
Feasibility Assessment
REST method Scope
AHU Format of
Documents Word Checklist Excel for analysis
Test points Instrumentation
Testing
Sensor verification
Test points Economizer Heating and
Cooling Coils Supply and Return
Fans Trends
Sample Test
Instrumentation
Digital Multimeter Tachometer Thermometer
Probes Anemometer Digital
Manometer Wireless Laptop
Thermodynamic Analysis
Mass Balance Energy Balance Exergy Analysis First and Second Law Efficiencies
Assumptions
Control Volume is around the AHU Mass flow in and out of CV
Cold water Hot water Outside air Exhaust air Supply air
Work into fans Steady State Incompressible flow No heat transfer out of CV Ignore potential and kinetic energy
Exergy
Potential for energy use Steady state exergy balance
Specific Flow Exergy (ef)
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Economizer
Economizer Analysis
Mass Balance Dry air Water
Energy Balance – check adiabatic assumption
2nd Law Efficiency
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aw mm *
Heating Coil
Energy Balance
2nd Law Efficiency
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1,12,21,2,
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Fan Performance
1st Law Fan Efficiency
2nd Law Efficiency
W
PV
W
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1,2,1,2,
Overall System
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Future Work
Run tests and collect data Analysis Develop software package Trend logging Retrofit solutions 2nd AHU?
Feedback/Questions
?
System Components
Economizer Heating Coil and Cooling Coil Supply and Return Fans
Economizer
Energy Recovery Device
Dampers Exhaust Air Outside Air Mixed Air
Sensors
Heating and Cooling Coils
Maintain temperature of supply air
Supply and Return Fans
Maintain 1.5” W.C. static pressure in system to circulate air
Provide fresh, outside air throughout the building
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