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Case StudyAugust 2016
ChallengeParkway Properties was challenged with making the twenty-
five-year-old One Orlando Centre, with original HVAC systems,
compete head-to-head with the newly constructed building
market. Although prior retrofits, including a T-8 lighting
conversion, reduced energy consumption, the building was
experiencing gross inherent inefficiencies compared to current
systems and design standards. Issues included garage roof
and 18th floor chiller plants, which were never connected
properly to enable optimized performance, and inconsistent
temperatures compromising comfort and the working
environment for tenants.
SolutionImpressed with the customizable solution presented by Trane,
Parkway Properties selected the company for its upgrade
project. Trane began by performing TRACE™ 700 modeling
and field testing to determine the effects of integrating
the building's two chiller plants. It was determined that
connecting the plants and optimizing the pumping strategy
would significantly reduce the connected load and improve
energy performance. The two chiller plants were re-piped into
a variable primary flow loop, allowing the system to reduce
pump horsepower and eliminate several chiller water pumps.
New cooling tower technology uses a fan array concept that
Parkway Properties is a real estate investment trust that owns and operates high quality office properties located in top-tier Sunbelt markets. A proud member of the New York Stock Exchange, Parkway focuses on providing exceptional service and innovative workplace solutions. It's the day-to-day attention to detail in the way they serve customers, enhance assets, and invest capital that makes the difference, and allows Parkway to create long-term value for its shareholders.
One Orlando Centre features on-site property management, twenty-four hour security, a full-service bank, a café, and panoramic views in the heart of downtown Orlando.
One Orlando CentreChiller plant integration, controls upgrade result in projected savings of 34 percent in energy use and 1.5 M gallons of water annually • Orlando, Florida
further reduces connected kW, an ability to recapture (water)
drift, and incorporates a near zero bleed water treatment.
Improving efficiency and redundancy
Two 375-ton Trane® Series S™ CenTraVac™ chillers deliver
optimal performance to keep tenants comfortable. For
increased redundancy, a 300-ton Trane Stealth™ air-cooled
chiller was also installed to handle peak and night loads.
Featuring AdaptiSpeed™ technology, the integration of a
direct-drive compressor, a permanent magnet motor, and third
generation Adaptive Frequency™ drive (AFD₃), the chillers
provide industry leading efficiencies and ultra quiet operation.
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
Controlling and monitoring building systems
Building operators use a Trane® Tracer™ SC building
automation system (BAS) to control and monitor HVAC,
lighting and other systems, from virtually anywhere, using
Web-connected devices, such as tablets and smartphones.
Tracer SC enables optimal start/stop scheduling, night setback,
chiller plant control, fan and pump pressure optimization,
reporting and alarm notifications. Tracer™ ES, a Web-based
systems integration solution, gives Parkway Properties an
online, enterprise-wide view of multiple properties and
systems, from any PC or mobile device on the network. The
customizable system lets managers perform daily operations
such as scheduling, alarm management and troubleshooting;
enables better decision making and faster issue response; and
allows tracking and analysis of all their buildings over time.
Utilizing reliable, wireless technology
Trane® Air-Fi™ wireless technology eliminates communication
wires between the BAS, unit controllers and zone sensors,
reducing controls installation costs. The wireless solution
provides twice the signal range of other wireless systems and
offers flexibility to reconfigure space for changing occupant
needs. Air-Fi's redundant, self-repairing mesh technology helps
ensure reliable communication, automatically rerouting around
obstacles to avoid disruption of building operations.
ResultsBy inter-connecting the two chiller plants and optimizing
the pumping strategy, Parkway Properties has been able to
significantly reduce its connected load at One Orlando Centre
by approximately 467 kW. New cooling towers incorporate a
near zero bleed water treatment program, with first year actual
savings of approximately 1.5 M gallons of water per year.
Trane® Series S™ CenTraVac™ and Stealth™ air-cooled chillers
have increased redundancy, and operate quietly and reliably
to create a comfortable environment. Using a Tracer SC BAS,
Parkway Properties has been able to further reduce energy
consumption and carbon footprint, and keep a watchful eye on
issues that could compromise tenant comfort.
A 34 percent average energy use savings has been achieved in
the first twelve months actuals. Parkway Properties continues
to monitor results, using multiple Intelligent Services: Trane
Building Performance to analyze system performance; Trane
Energy Optics™, which uses utility interval data to show usage
trends and identify needed adjustments; and Trane Energy
Performance, a cloud-based online dashboard to provide
visualization of energy use, enabling implementation and
validation of demand reduction strategies to sustain savings
and support the discovery of improvement opportunities.
Two 375-ton Trane Series S™ CenTraVac™ chillers installed in the 18th floor chiller plant deliver best-in-class full-and part-load efficiencies.
©2016 Ingersoll Rand CASE-SLX411-EN August 09, 2016
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