RETROCOMMISSIONING AIR HANDLING SYSTEMS

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Presentation transcript:

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

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)

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 Team 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 Trends 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)

Economizer

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

Heating Coil Energy Balance 2nd Law Efficiency

Fan Performance 1st Law Fan Efficiency 2nd Law Efficiency

Overall System

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 Sensors 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 Discuss testing points

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