1. RETROCOMMISSIONING AIR HANDLING SYSTEMS
The Golisano College of Computing and
Information Sciences, Building 70
Preliminary Design Presentation
Project 05306
February 18th 2005

2. Team Members Mechanical Engineers Electrical Engineer
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 Needs Assessment Concept Development & Feasibility
Final Concept
AHU System Components & Testing
Electrical Components & Instrumentation
Engineering Analysis
Future Work

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

5. Project Goals - Senior Design 1
Understand the thermodynamic, mechanical and electrical aspects of an air handling unit
Develop retrocommissioning plan
Test procedures
Instrumentation list

6. Needs Assessment Sponsor Needs Team Needs Develop test checklist
Test system
Develop retrofit solutions
Team Needs
Apply engineering knowledge
Gain work experience

7. Concept Development Scope Format of Documents Test points
Instrumentation

8. Feasibility Assessment
REST method
Scope
AHU
Format of Documents
Word Checklist
Excel for analysis
Test points
Instrumentation

10. Testing Sensor verification Test points Trends Economizer
Heating and Cooling Coils
Supply and Return Fans
Trends

11. Sample Test

13. Instrumentation Digital Multimeter Tachometer Thermometer Probes
Anemometer
Digital Manometer
Wireless Laptop

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

15. 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

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

17. Economizer

18. Economizer Analysis Mass Balance
Dry air
Water
Energy Balance – check adiabatic assumption
2nd Law Efficiency

19. Heating Coil
Energy Balance
2nd Law Efficiency

20. Fan Performance
1st Law Fan Efficiency
2nd Law Efficiency

21. Overall System

22. Future Work Run tests and collect data Analysis
Develop software package
Trend logging
Retrofit solutions
2nd AHU?

23. Feedback/Questions ?

24. System Components Economizer Heating Coil and Cooling Coil
Supply and Return Fans

26. Economizer Energy Recovery Device Dampers Sensors Exhaust Air
Outside Air
Mixed Air
Sensors

28. Heating and Cooling Coils
Maintain temperature of supply air

31. Supply and Return Fans
Maintain 1.5” W.C. static pressure in system to circulate air
Provide fresh, outside air throughout the building
Discuss testing points