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Partnering with Utilities for Energy Efficient Dorms – Water Heating Project Study and Other Ways to Reduce Energy. Peter Duby , Pepperdine University Gabriel Ayala, Enovative Group Inc. Defining Sustainability. Not one size fits all Institution and leading department
Partnering with Utilities for Energy Efficient Dorms – Water Heating Project Study and Other Ways to Reduce Energy Peter Duby, Pepperdine University Gabriel Ayala, Enovative Group Inc.
Defining Sustainability • Not one size fits all • Institution and leading department • Purpose, Service, and Leadership
Why Sustainability is Important • Opportunity and responsibility • Each student is different • Community of awareness and conservation
Challenges • Funding • Engaging entire community • Choosing sustainability initiatives
Sustainability Practices • Recycled water for irrigation • Drescher campus native vegetation • Recycling • Organic Garden
Energy Efficiency “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.” • Economic benefits • President’s energy reduction goal • Lighting, EMS expansion, virtualization
Working with Utilities • Rebates and incentives • Objective verification • SCE $100,000 audit • So Cal Gas pool cover
Residential Living Space • Spend the most time in living space • No parents • Simple energy saving • SCE metering • Demand circulation pumps
Demand Controlled Recirculation Systems in University Dorm Buildings Improving Hot Water Distribution and Saving Energy Using Advanced Recirculation Controls
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)
4) As water is being circulated, thepipes are constantly radiating heat into the surrounding environment 5) When water returns, it is much cooler from the heat loss, so the boiler constantly fires on to reheat the water 1) Cold water supply 2) Water heated to approximately140℉ 3) Hot water is continuously circulated throughout the building from the storage tank
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
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
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
Chapman University Case Study Dorm #1- South Morlan Dorm #2- Sandhu Hall • Baseline WH Gas Use: 6055 therms (annual) • Projected Energy Use, Post Measure: 4095 therms • Savings: 1960 therms • 25% During Semester • 48% During Breaks • Baseline WH Gas Use: 9316 therms(annual) • Projected Energy Use, Post Measure: 7423 therms • Savings: 1893 therms • 13% During Semester • 48% During Breaks