2500 Windy Ridge Parkway — A Showcase in Energy Efficiency. The McKenney’s in-house design engineering team developed a comprehensive energy model of the building to analyze and compare multiple upgrade options, including alternative plant configurations and chiller efficiencies.

1. Project Highlights
2500 Windy Ridge
Parkway—A Showcase Project Team
žž Owner: Wells Real Estate Funds
in Energy Efficiency žž Contractor/Engineer:
McKenney’s, Inc.
W
ith more than $11 billion the entire building. Unfortunately, the original The Challenge
invested in real estate, plant configuration was not the most efficient
Wells Real Estate Funds and did not include today’s technologies. Sig- žž Upgrade dated equipment and
systems, including CEP and BAS
is committed to sustainable practices that nificant operational improvements had been
promote growth. As a result, the firm has made previously by Wells to increase Energy žž Implement strategies and
implemented major green initiatives for many Star® performance from 75 to 92 but much install equipment to conserve
of its properties, including the 15-story office of the original equipment was at the end natural resources
building at 2500 Windy Ridge Parkway in of its useful life and needed to be replaced.
The Solution
The McKenney’s in-house žž Analyze and compare systems
design engineering team for most cost- and energy-
efficient solution
developed a compre­
hensive energy model žž Install new series variable
flow CEP
of the building to analyze
and compare multiple žž Implement new web-based
digital control systems
upgrade options,
žž Repurpose condensate for
i­ncluding alternative cooling tower makeup water
plant configurations
žž Harvest water for irrigation
and chiller efficiencies.
The Results
Atlanta. That property is now recognized The McKenney’s in-house design engineer­
žž Supported LEED Gold
®
as one of the area’s flagship models for ing team developed a comprehensive energy
sustainability and energy efficiency. model of the building to analyze and com- ­Certification award
pare multiple upgrade options, including
žž Improved Energy Star rating
®
The building—which serves as corporate
alternative plant configurations and chiller from 75 to 98
headquarters for Coca-Cola Enterprises—
efficiencies. The team installed a variable
was built in 1985. Wells wanted to enhance
p
­ rimary flow, all VFD CEP featuring two 425- žž Reduced water use for cooling
the original mechanical systems to improve tower operations by 46 percent
ton water-cooled chillers piped in a series
efficiency and McKenney’s was chosen to
counterflow arrangement for more opera- žž Saved more than 80,000 gallons
manage the upgrade with a focus on energy of irrigation water in 6 months
tional control and greater energy efficiency.
and environmental stewardship.
Even though the variable flow configuration žž Projected 16 month
The central energy plant (CEP) provides payback for variable flow
required an additional $100,000 investment,
h
­ eating and air-conditioning services for ­configuration investment
For more information contact McKenney’s at 404-622-5000. žž Five year projection to recoup
entire CEP investment
info@mckenneys.com  www.mckenneys.com

2. Project highlights
How did the Central Plant Upgrade Impact Energy Consumption?
195,000 2,000,000
Cummulative Energy Savings (kWh)
1,800,000
Monthly Energy Savings (kWh)
170,000
1,600,000
145,000
1,400,000
120,000 1,200,000
95,000 1,000,000
70,000 800,000
600,000
45,000
400,000
20,000 200,000
[5,000] 0
Jan Feb March April May June July Aug Sept Oct Nov Dec
MOnth
 2010 Monthly Savings  2011 Monthly Savings Cumulative Savings
An energy usage report indicates significant, consistent reduction in energy consumption for the 2500 Windy Ridge Parkway property since the upgrade.
energy savings were immediate. As a result, Georgia has experienced a precipitous the system is used to irrigate land around the
Wells expects a payback of 16 months for drop in rainfall in recent years, which has property. In less than six months, Wells has
the additional investment and is projecting compromised natural water resources. saved more than 80,000 gallons of water.
to recoup its investment for the complete As a result, McKenney’s installed a conden-
CEP transition within five years. sate recovery system to capture discharge
from each of the main air-handling units
Recognition of
The CEP upgrade was only the beginning.
(AHUs) into a 250-gallon capacity drum. Wells Real Estate
McKenney’s upgraded the building automa-
tion system (BAS) to maximize operational
The condensate from these units is typically Funds Innovation
directed to the sewer for processing at the With 19 LEED®-certified and 48 Energy Star®-
savings. The control system for the pneumatic
city water treatment plant. With the new rated properties in its portfolio, Wells Real
terminal units, fan coil units and air handling
McKenney’s system, the water is used for Estate Funds has earned its distinction as an
units was replaced with a Web-based,
cooling tower operations. environmental champion. The 2500 Windy
electronic direct digital control (DDC) system.
The new controls incorporate McKenney’s In less than two years, the new system Ridge Parkway property is one of its most
innovative bdoc® technology for customized has saved more than 262,000 gallons of prized buildings. This is due in part to the
operation of the central plant. water, which has reduced the amount of water CEP and BAS upgrades as well as AHU
used for cooling tower operations by about condensate and rainwater harvesting systems
that McKenney’s implemented to help improve
Maximizing 46 percent. In addition, less energy is exerted
to collect, treat and transport the water. the building’s Energy Star rating from 75
Natural Resources to 98. As a result, Wells received LEED
McKenney’s also designed and installed Gold Certification and won an Innovation in
Wells Real Estate Funds understood
a 15,000-gallon rainwater harvesting system Business award at the 2011 LEED-Showcase
that conserving natural resources would
that was integrated into the existing roof Awards for the greater Atlanta area.
be critical for improving sustainability.
drainage system. The water retained from
McKenney’s, Inc.  1056 Moreland Industrial Boulevard, Atlanta, Georgia 30316 Copyright © 2012 McKenney’s, Inc., Atlanta, Georgia. All rights reserved. Printed in the U.S.A.