Auraria Higher Education Center Case Study John Ismert & Frank Ellis Auraria Higher Education Center...
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Transcript of Auraria Higher Education Center Case Study John Ismert & Frank Ellis Auraria Higher Education Center...
![Page 1: Auraria Higher Education Center Case Study John Ismert & Frank Ellis Auraria Higher Education Center Facilities Management.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649dff5503460f94ae7ab3/html5/thumbnails/1.jpg)
Auraria Higher Education CenterCase Study
John Ismert & Frank Ellis
Auraria Higher Education Center
Facilities Management
![Page 2: Auraria Higher Education Center Case Study John Ismert & Frank Ellis Auraria Higher Education Center Facilities Management.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649dff5503460f94ae7ab3/html5/thumbnails/2.jpg)
Auraria Higher Education Center
• Built in 1976-77• 18 campus buildings• 1,700,000 square feet of
office and classroom space
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Auraria Higher Education CenterProject Scenario
• Campus built 20 years ago• Fast-track construction project• All the equipment is beginning to
wear out at once• Energy efficient systems have
progressed a lot in 20 years• Time for some major retrofit work
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Auraria Higher Education CenterMain Cooling Plants
• North Classroom Chiller Plant
• P.E. Building Chiller Plant• Plaza Building Chiller
Plant• North Chiller Plant
– serves Science, Arts and Library buildings
• South Chiller Plant– serves Central, West, South,
and Technology buildings
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Auraria Higher Education CenterHeating & Hot Water System
• Purchased steam from Public Service Company in Denver for heating
• Hot water generated from heat exchange with steam system
• Typical of late 1970s with escalating gas prices• Studied replacement options but decided to
keep steam system– would have needed 60+ gas boilers– able to negotiate lower steam cost
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Auraria Higher Education CenterElectricity Use in North Chiller Plant
• Monthly cooling and non-cooling electricity consumption 1995
• Monthly electricity demand 1995
0
20
40
60
80
100
120
140
160
180
200
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Energy Consumption (1000 kWH)
cooling consumption non-cooling consumption
0
100
200
300
400
500
600
700
800
900
1000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Demand (KW)
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Auraria Higher Education CenterProject Challenges
• More work than can be done under the budget available
• Must fit into a 10 year self-funded project
• Coordination of systems between all campus buildings
• Need to restore cooling capabilities before the summer of 1997
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Auraria Higher Education Center Campus Improvements Made
• New efficient chillers and cooling tower in North Chiller Plant
• New direct digital controls in 7 buildings • Air side improvements in many buildings• Lighting improvements• Fume hood efficiency improvements
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Auraria Higher Education CenterNorth Chiller Plant
• Original Chillers– Two 550 ton centrifugal electric chillers– R-12 refrigerant (CFC)– 0.78 kW/ton efficiency
• New Chillers– Two 550 ton centrifugal electric chillers– R-134a refrigerant (HFC)– 0.48 kW/ton efficiency
• Undersized cooling tower replaced– single-cell, induced draft tower
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Auraria Higher Education CenterNorth Chiller Plant Energy Savings
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Auraria Higher Education Center Direct Digital Controls
• Added to 7 campus buildings• New fiber optic network• More aggressive energy conservation strategies
– tighten chilled water and hot water resets– tighter run times– changed evaporative cooling & chilled water
sequencing
• Monitored water meters for sprinklers & cooling towers for more accurate sewer credit
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Auraria Higher Education CenterAir Side Improvements
• Science building– 2 new air handling units – new coils on 4 old air handling units– new VFD drives and motors for supply air fans– replaced variable air volume boxes
• Art building– replaced evaporative cooler media
• PE building– failing heat storage wheel replaced with heat exchanger
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Auraria Higher Education CenterLighting Improvements
• High efficiency T-8 lamps• Rapid start electronic ballasts• Compact fluoruescents in place of
incandescents• Exit lamps replaced with long life lamps• 10,682 fixtures modified in 13 buildings• Light levels maintained or improved
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Auraria Higher Education CenterFume Hood Improvements
• Over 50 fume hoods retrofitted– North Classroom and Science buildings
• Proximity sensors installed and attached to 2-position dampers– reduce air flow from 100 fpm to 60 fpm at night
or when no one is near the hoods
• Integrated operation of building make-up and exhaust air and fume hood ventilation
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Auraria Higher Education CenterEstimated Project Finances
• Other improvements help pay for chiller plant work
Purchase &Installation
Cost
Rebates andCredit
Deductions
AnnualEnergySavings
PaybackPeriod(years)
North Chiller &Cooling Tower
549,700 63,000 rebate35,000 R-12
25,600 17.6
Direct DigitalControls
577,500 --- 49,40020,000 sewer
8.3
Air SideImprovements
74,000 17,000 13,900 4.1
LightingImprovements
590,800 86,000 rebate40,000 ICP
142,000 3.3
Fume Hoods 279,800 9,000 52,400 5.2
Total 2,071,800 250,000 303,300 6.0Service Contract --- --- - 49,300 7.2
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Auraria Higher Education CenterFinancing Structure of Project
• Ten year bond from AHEC• $2 million worth of improvements• $175,000 demand side management rebates• $40,000 ICP grant, $35,000 R-12 credit• Annual utility savings of ~ $300,000• 7.2 year overall project payback period with
performance contracting service provided
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Auraria Higher Education CenterProject Timeline
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Auraria Higher Education CenterProject Results
• Utility savings of about $300,000 annually• Took advantage of DSM rebate programs• More comfortable learning environment• Increased energy awareness level at AHEC• Newer, more efficient state-of-the-art systems• Reduced dependence on CFC’s