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 Analysis

Mass Balance Dry air Water

Energy Balance – check adiabatic assumption

2nd Law Efficiency

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Heating Coil

Energy Balance

2nd Law Efficiency

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Fan Performance

1st Law Fan Efficiency

2nd Law Efficiency

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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

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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