Rock Valley College

Karl J. Jacobs Center for Science and Math

February 8, 2011

Dan Comperchio, PEAdam McMillen, PE, LEED® AP, BD+C

Rock Valley College Karl J. Jacobs Center for Science and Math

Facility Overview

Chilled Beam and Geothermal Application

Systems and Airflows

System Energy Savings

Lessons Learned

Agenda

Rock Valley Community CollegeKarl J. Jacobs Center for Science and Math

New Construction100,000 Square Feet, Three FloorsSix Life Science Labs, Six Physical Science

Labs, 12 Mathematics Classrooms, Faculty

Offices, Student Life SpacesTargeting LEED Gold Under LEED 2009

Saavedra Gehlhausen ArchitectsDemonica Kemper Architects

Facility Overview

Daylight and Occupancy Sensors

Multiple Switching Zones

Building Integrated Photovoltaic Modules

Energy Saving Technologies

Energy Saving Technologies at Rock Valley Community College:Geothermal Field

Water Cooled Heat Pumps

Chilled Beam Cooling

Variable Air Volume Air Handling Units

Energy Recovery on Air Handling Units

Thermally Efficient Glazing

White Membrane Roof With R-27 Insulation Value

Geothermal Domestic Water Heating System

Variable Frequency Drives

High Efficiency Lighting Fixtures, Low Mercury Lamps

Transformers Bearing Energy Star Label

Project Energy Grants

Illinois Clean Energy Community Foundation (Geothermal) - $90,000

Illinois Clean Energy Community Foundation (Building Integrated PV) - $115,000

Illinois Clean Energy Community Foundation (LEED Gold) - $150,000

Illinois Dept of Commerce and Economic Opportunity (Geothermal) - $420,000 ARRA funding - 26% of geothermal installation cost

Earth absorbs 50% of all solar energy

Heat is stored in the earth

Remains a constant temperature below the frost line

Uses constant temperature to exchange energy between your building and the earth

Geothermal Systems: The Basics

System Applications at Rock Valley College

164 vertical well bores

370’ deep

420 tons cooling capacity

Geothermal Field Location

Geothermal Field

New Facility

Geothermal Field Installation

Geothermal Field Installation

Geothermal Field Installation

Chilled Beam System

Chilled beams were used to handle sensible load

Dedicated Outdoor Air System (DOAS) provided ventilation air and all latent capacity

Saved over 45% of airflow using chilled beams and DOAS over traditional VAV

Chilled Beam System

Utilized chilled beams in over 60% of spaces

Areas without chilled beams included:

Mechanical/Electrical Rooms Select Corridors Restrooms, Janitor Closets Lab Spaces with high ACH

requirements Greenhouse

Chilled Beam/DOAS VAV

Ground Floor Layout

First Floor Layout

Chilled Beam/DOAS VAV

DOAS Unit

DOAS Psychometrics

Humidity Control

Aggressive humidity control at DOAS

Dewpoint sensors in areas of concern

Zone control valves close when dewpoint rises above the setpoint

Chilled Water Loop

Energy Results

LEED Implications

Optimize Energy: pursing 19 points

Enhanced Refrigerant Management: pursuing 2 points

Indoor Chemical and Pollutant Source Control:

eligible with November 2010 addenda

Controllability of Systems – Thermal Comfort:

pursuing 1 point

Lessons Learned

Many buildings require a hybrid system approach to best meet the building needs

Primary airflow requirements can vary widely based on latent load

Dry supply air can significantly reduce air handler unit size and potentially reduce first cost

Consider demand control ventilation for additional fan energy savings

Questions?

Thank YouKJWW Engineering

1100 East Warrenville RoadNaperville, Illinois 60563

630-527-2320Dan Comperchio, PE (comperchiodp@kjww.com)

Adam McMillen, PE, LEED® AP, BD+C (mcmillenam@kjww.com)