peter duby, pepperdine university gabriel ayala, enovative group inc
TRANSCRIPT
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Peter Duby, Pepperdine University
Gabriel Ayala, Enovative Group Inc.
Partnering with Utilities for Energy Efficient Dorms
– Water Heating Project Study and Other Ways to
Reduce Energy
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Not one size fits all
Institution and leading department
Purpose, Service, and Leadership
Defining Sustainability
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Why Sustainability is Important
Opportunity and responsibility
Each student is different
Community of awareness and conservation
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Challenges
FundingEngaging entire
communityChoosing
sustainability initiatives
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Sustainability Practices
Recycled water for irrigation
Drescher campus native vegetation
RecyclingOrganic Garden
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Energy Efficiency
Economic benefits
President’s energy reduction goal
Lighting, EMS expansion, virtualization
“Examine initiatives to reduce reliance on third parties in
meeting energy needs for the Malibu campus. Prepare and present a validated plant to reduce costs by at least 10% ($280,000) over FY 2008.”
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Working with Utilities
Rebates and incentives
Objective verification
SCE $100,000 audit
So Cal Gas pool cover
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Residential Living Space
Spend the most time in living space
No parents
Simple energy saving
SCE metering
Demand circulation pumps
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Demand Controlled Recirculation Systems in University Dorm BuildingsImproving Hot Water Distribution and Saving Energy Using Advanced Recirculation Controls
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What Are Demand Controlled Pumps?Advanced controls for central domestic hot
water recirculation pumps
Reduces Boiler Fire Time (Saves Gas)
Reduces Pump Run Time (Saves Electricity)
Reduces Wear and Tear on Pipes (Pinhole Leaks)
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1) Cold water supply
2) Water heated to approximately 140℉
3) Hot water is continuously circulated throughout the building from the storage tank
4) As water is being circulated, thepipes are constantly radiating heat into the surrounding envi-ronment
5) When water returns, it is much cooler from the heat loss, so the boiler constantly fires on to reheat the water
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When does a recirculation pump NOT need to run?
If there is no user demand for hot water
If there is already hot water at the point of use
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Demand Controls Regulate Hot Water Distribution
• Uses sensors that detect demand and water temperature only runs when needed
• Runs about 1 hour per day total, instead of 24/7
• Heat losses reduced, boiler fires up 10-30% less often
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Pepperdine University Dorms• Monitored a 30 unit
dorm for 4 weeks
• Analysis during semester and into winter break period
• Savings = • 32% during
occupied times• 46% = during
unoccupied times
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Pepperdine Pump Runtime (1 Month)
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Pepperdine Boiler Gas Valve ‘Open’ Time
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Dorm #1- South MorlanBaseline WH Gas
Use: 6055 therms (annual)
Projected Energy Use, Post Measure: 4095 therms
Savings: 1960 therms25% During
Semester48% During Breaks
Baseline WH Gas Use: 9316 therms (annual)
Projected Energy Use, Post Measure: 7423 therms
Savings: 1893 therms13% During
Semester48% During Breaks
Chapman University Case Study
Dorm #2- Sandhu Hall