McKenney’s recommended an innovative approach - Demand Control Ventilation - to monitor and adjust the building’s outside air ventilation levels based on ASHRAE 90.1 standards. For more information visit http://www.mckenneys.com.

2. Columbia Property Trust has had a longtime
commitment to sustainable practices that
maximize energy efficiency and reduce
environmental impact on the community.
Photo courtesy of Columbia Property Trust
Its 14-story, 353,000-square-foot suburban office building in Atlanta
had already achieved ENERGY STAR® certification and consistently
maintained a score of 87, putting the structure in the top tier of the 15
percent most energy-efficient buildings in the U.S.

3. However, Columbia Property Trust still had
room for improvement. With aspirations of
achieving even greater energy efficiency, the
senior property manager approached the
McKenney’s Automation & Control Solutions
(ACS) team for insight and recommendations
to improve its HVAC system efficiency.

4. After thoroughly reviewing the facility,
McKenney’s recommended an innovative
approach to monitor and adjust the
building’s outside air ventilation levels
based on ASHRAE 90.1 standards.
The solution involved introducing Demand Control Ventilation(DCV)
to monitor the amount of outside air entering the building based on
carbon dioxide (CO2) concentrations.
CO2 levels continuously fluctuate in a building as its population
changes.

5. DCV continuously monitors each floor in a
building and automatically adjusts outside air
ventilation rates.
This is achieved by using controls and variable
frequency drive (VFD)technology as needed,
while still meeting ASHRAE ventilation standards.
By optimizing the amount of outside air
coming into the building, there is less air that
has to be heated or cooled, resulting in a
reduced load on the HVAC system.

6. To ensure the solution was as effective as
possible for the company, the McKenney’s ACS
team installed CO2 monitors in the building,
added custom programming for certain aspects of
the project and reprogrammed the existing
controls system to effectively integrate the DCV
solution.
Since installing the DCV system, the load on the building’s HVAC system
has been substantially reduced by an estimated 70 tons on a 70-degree
day.
In turn, this solution lowered the energy usage for the building by an
average of 65,000 kWh per month since installation while maintaining
a comfortable environment for tenants.
The DCV solution also achieved a quick return on investment (ROI) of
less than four months.
The content of this document is not intended as an endorsement.

7. Project Team
Owner: Columbia Property Trust
General Contractor: McKenney’s, Inc.
The Challenge
Provide energy-saving solutions with quick ROI
Maintain tenant comfort
Comply with ASHRAE standards
The Solution
Introduced DCV system to monitor outside air entering building
Installed CO2 monitors
Custom programming and reprogramming of controls
The Results
Average of 65,000 kWh per month energy usage reduction
Solutions meet ASHRAE standards
ROI was less than four months
Comfortable and healthy environment for tenants

8. Atlanta Office: 1056 Moreland Industrial Boulevard
Atlanta, Georgia 30316
P: 404-622-5000
Charlotte Office: 3601 Performance Road
Charlotte, North Carolina 28214
P: 704-357-1200
sales@mckenneys.com
www.mckenneys.com