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

Not one size fits all

Institution and leading department

Purpose, Service, and Leadership

Defining Sustainability

Why Sustainability is Important

Opportunity and responsibility

Each student is different

Community of awareness and conservation

Challenges

FundingEngaging entire

communityChoosing

sustainability initiatives

Sustainability Practices

Recycled water for irrigation

Drescher campus native vegetation

RecyclingOrganic Garden

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.”  

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 BuildingsImproving 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)

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

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

Pepperdine Pump Runtime (1 Month)

Pepperdine Boiler Gas Valve ‘Open’ Time

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