NET ZERO STUDY ON A COMMUNITY COLLEGE

By: Amanda O’Connell Doenges

My Background

University of Dayton Bachelor’s in Mechanical

Engineering Masters in Renewable and

Clean Energy Heapy Engineering – LEED

& Energy Services Energy Master Plan for

Sinclair Community College

Sinclair Pre-2004

Proactive campus Facilities department – energy aware IT development

Added monitors, projectors, etc. to classrooms and offices

What was already done

T12 to T8 lighting retrofits LED lighting CRT to LCD computer monitors De-lamping of exterior lighting Variable frequency drives to all air and

water side systems Addition of return air to 100% outside air

systems

House Bill 251

20% energy reduction by 2014 (compared to 2004)

Net-Zero?

HB 251 is a good first goal Possibility of going beyond 20%

reduction Steps:

Decrease current energy consumption Renewable Energy

Renewable Energy

Large Flat Roof Areas – Solar PV 2,200 MWh/year – could produce Current consumption at 300,000 MWh/year

(only electric) Low Velocity Wind Turbine

Utility Analysis + Benchmarking Campus Energy Use Intensity: 134

kBtu/sf Commercial Building Energy

Consumption Survey (CBECS) Database: 120 kBtu/sf

Campus density factor? Average Campus: 250-450 users per

100,000 GSF Urban Campus: 550-750 users per 100,000

GSF Sinclair: 970 users per 100,00 GSF Using Urban Campus Average = 179

kBtu/sf

Year to Year Comparison

Square Footage Occupants Weather (CDD and HDD) All

Energy Conservation Measures Daylight Harvesting

Occupancy Sensors

Revise Temperature Set Points to 75F and 70F

Energy Conservation Measures PC Automatic Shutoff

Energy Conservation Measures Vending Miser Exterior Lighting Controls

Energy Conservation Measures

Boiler Retrofits Very high base load natural gas

consumption Central boilers – DHW and Summer Reheat

Summer Boiler or Heat Recovery Chiller Boiler Plant Upgrades (Parallel positioning)

16%+ overall energy reduction through boiler replacements/retrofits

Retro-Commissioning

Identifies operational issues

Original design intent Lawrence Berkeley

National Laboratory Study 5-15% savings in total

building energy use Commission all new

buildings

Photo courtesy of CTG Energetics, Inc.

Next Steps

Energy Conservation Measures and Retro-Cx will help to move towards 20%, but will not be Net Zero

Future: Retro-Commissioning Energy Metering Sustainability Coordinator Education Renewable Energy

Energy Metering

Meter each building individually Sub meter large energy consuming

processes Lighting Ventilation Heating Cooling Plug Loads

ASHRAE Journal – April 2011 – 1-20% savings

Sustainability Coordinator

Individual or a firm Directly under a President or VP Position strictly focused on campus

energy and/or sustainability Education to address energy related

behavioral changes

Summary

Short Term Energy Savings Energy Conservation Measures + Retro-Cx Campus Awareness

Long Term Plan Capital Improvements Energy Metering Sustainability Coordinator Education Renewable Energy

Amanda O’Connell Doenges

Questions?