Case StudyOctober 2016

ChallengeThe forty-year-old, two-tower Sun Life Financial Center was

operating two connected cooling systems. When Bentall

Kennedy identified the need for end-of-life equipment

replacement in one of the building's cooling plants, they

decided to evaluate the equipment in both towers, seeking to

improve efficiency throughout the complex and align with the

firm's commitment to sustainability.

SolutionWorking with Halsall, Alliance Engineering and Bentall

Kennedy conducted an in-depth design/costing study,

using a calibrated building simulation model to evaluate

several upgrade scenarios compared to a simple like-for-like

replacement. Comparison metrics included energy performance,

return on investment and greenhouse gas impact. The study

revealed that upgrading the Sun Life Financial Center with a

replacement heat recovery chiller, along with a second upsized

chiller to replace the two existing units, would provide a

positive net present value, operational redundancy and fuel

switching capabilities.

Life cycle cost analysis and performance evaluation

Alliance and Bentall Kennedy understood the advantages of

pre-selecting the equipment separately from the installation

Bentall Kennedy, one of North America's largest real estate investment advisory and services firms, serves the interests of over 500 institutional investors and manages 134 million square feet of office, retail, industrial and multi-residential property throughout the United States and Canada. Sun Life Financial Center, one of Bentall Kennedy's properties, includes more than a million square feet of leasable area in two Class A office towers connected by a main atrium.

Upgraded to replace aging equipment, reduce environmental impacts and improve energy efficiency, the Sun LIfe Financial Center houses a diverse clientele of corporate offices, restaurants and stores.

Sun Life Financial CenterEnhanced energy management strategy reduces greenhouse gas emissions2.5 percent, results in government incentive of $536,000+ • Ottawa, Ontario

tender to ensure they got exactly what they needed to meet

efficiency objectives. Equipment performance was evaluated

at part- and full-load conditions to model the diverse tenant

needs. Based on a twenty-year life cycle cost analysis that

included installed and operating energy costs; a ten-year parts,

labor and refrigerant warranty; service agreement; factory

performance evaluation; and potential energy incentives,

Bentall Kennedy selected Trane equipment for the project.

Ingersoll Rand (NYSE:IR) advances the quality of life by creating comfortable, sustainable and e�cient environments. Our people and our family of brands—including Club Car®, Ingersoll Rand®, Thermo King® and Trane®—work together to enhance the quality and comfort of air in homes and buildings; transport and protect food and perishables; and increase industrial productivity and e�ciency. We are a $13 billion global business committed to a world of sustainable progress and enduring results.

We are committed to using environmentally conscious print practices.

trane.com ingersollrand.com

Reliable operation and efficiency

Following a competitive tendering process, Bentall

Kennedy engaged Alliance to proceed with the installation

of the upgrade, replacing its aging equipment with Trane®

CenTraVac™ centrifugal chillers. With the fewest moving parts

in the industry, CenTraVac chillers provide reliable operation

and tight temperature tolerances, and can achieve average

full-load efficiency levels 15 percent better than competitive

chillers. The use of low-pressure refrigerant and reduced

refrigerant leak rates help to reduce greenhouse gas emissions.

An enhanced energy management strategy

To better respond to building needs, the chilled water pumping

system was changed from a primary-secondary system to

variable-primary flow, eliminating three 60 hp chilled water

pumps, lowering capital and maintenance costs, and providing

greater system reliability. Heat recovery included on the

first chiller makes use of heat normally rejected into the air

to further improve operating efficiency and reduce energy

costs. An Adaptive Frequency™ Drive (AFD₃) on the second

chiller varies the speed of compressor motors to optimize

performance, reducing energy consumption and electrical

demand charges. The AFD₃ offers a part-load efficiency

improvement of more than 40 percent compared to previous

constant-speed chiller designs. The chiller also includes free

cooling, a refrigerant migration feature that can provide up to

45 percent of chiller capacity without running the compressor.

ResultsDemonstrating the value of planning, in-depth study,

and energy modeling, Bentall Kennedy, working with Alliance

Engineering, Halsall and Trane, improved energy performance

of the Sun Life Financial Center. A life cycle cost analysis was

used to aid in equipment selection for a variable-primary

flow system that uses Trane CenTraVac chillers with heat

recovery, AFD₃, and a free cooling option. As a result, the

building has increased redundancy, reduced operating costs,

and lowered greenhouse gas emissions by 2.5 percent.

The high performance of the system earned an energy

efficiency incentive of more than $536,000 from the Ontario

saveONenergyOM conservation program.

“The equipment performance was first class at both full- and

part-load,” said Brandon Malleck, Manager, Technical Services

and Projects, Bentall Kennedy. “We are pleased with the

carbon reductions, energy savings, and best-in-class support

provided by Trane."

A Trane CenTraVac centrifugal chiller is lifted into place at Sun Life Financial Center.

©2016 Ingersoll Rand CASE-SLX412-EN October 06, 2016