ChallengeThe aging chiller plant at Monongahela Valley Hospital,

installed in the 1970s, was nearing the end of its useful life.

With the hospital running 24/7, and the nature of its work,

facility managers knew it was critical that the chiller plant be

upgraded quickly. The chiller plant upgrade and integration

of the control systems would need to be performed while

MVH continued to use the existing equipment, in order to

adhere to the hospital’s zero cooling system downtime

requirements. In addition to keeping its patients and staff

comfortable, the hospital set a goal to lower energy costs.

SolutionMonongahela Valley Hospital called on the expertise of Trane

to provide a complete turnkey solution to meet the

challenges of its chiller plant replacement.

Modular design speeds installation

To save installation time, a packaged pre-built modular chiller

plant was delivered to the site in three sections and

assembled within a new pre-piped and pre-wired enclosure.

Designed to fit in the tight space requirements outlined by

the hospital, the compact chiller plant was placed on a

concrete pad in a small area outside the building. A steel

structure was built above the new plant enclosure to hold the

two cooling towers.

Monongahela Valley HospitalTurnkey solution meets zero downtime requirements, exceeds expectationsMonongahela, PA

Monongahela Valley Hospital (MVH) is a 280,000 sq ft, 226-bed, full-service health care facility with 1,100employees, including a 220-member medical staff representing more than forty specialties. In addition to theplethora of services offered, MVH offers resources and support to the community. The 100-year-old hospital strivesto provide the highest quality care to its patients, as well as comfort and convenience to family members and friends.

New chillers improve efficiency, reliability

Two 400-ton high-efficiency Trane CenTraVac™ centrifugal

chillers were installed. The robust design of the Trane

CenTraVac centrifugal chiller, with only one moving part,

makes it one of the most reliable in the industry and the right

choice to meet the hospital’s zero cooling system downtime

criteria. The CenTraVac chiller requires less refrigerant to

operate and its semi-hermetic motor design, along with

low-pressure refrigerant, reduces refrigerant leaks, assuring a

clean, cool operation for maximum performance. The quiet,

vibration-free operation of the chiller also helps the hospital

maintain a restful environment for its patients.

A packaged pre-built modular chiller plant installed at MVH includes two

400-ton high-efficiency Trane CenTraVac centrifugal chillers.

August 2013Case study

VFDs, heat exchangers provide energy savings

The chiller plant includes an energy-saving heat exchanger to

allow free cooling in cooler months, and variable frequency

drives (VFDs) on the CenTraVac chiller, the chilled water and

condenser water pumps, and the cooling tower fans. The

VFDs reduce energy usage, extend motor life and help to

maximize the comfort of patients and staff.

Control system allows easy monitoring

A Trane Tracer™ SC control system automates the chiller

plant and integrates fully through BACnet® with the existing

third party vendor’s HVAC controls system already used by

the hospital. The web-based controller with graphics provides

an easy-to-use interface via the web to monitor and control

the chiller plant from any location. The management tool

helps improve efficiencies, reduce energy costs and increase

comfort. Facility managers use the Tracer SC to optimize

energy efficiency with chiller sequencing routines, coordinate

the pump and cooling tower to reduce costs, and use

diagnostic messages for troubleshooting.

TIS ensures fast issue resolution

A Trane service contract ensures the peak performance of the

equipment and reduces service costs with a regular

maintenance plan versus emergency service calls. Trane®

Intelligent Services (TIS) Active Monitoring provides

peace-of-mind to building managers with constant

monitoring of systems, alarm notification, diagnostics and

analysis by Trane technical specialists. Continually collecting

and interpreting data from the building equipment and

controls, TIS allows responsive action should an issue arise.

ResultsMonongahela Valley Hospital replaced its aging chiller with a

new Trane high efficiency chilled water plant, which includes

two Trane 400-ton CenTraVac™ chillers, a free cooling heat

exchanger, and VFDs on the chillers, water pumps and

cooling tower fans. A new Trane Tracer SC controller was

integrated into the existing control system for easy

monitoring of the fully-automated chiller plant. The

upgrades, which were completed without disruption to

hospital operations, are reducing energy and maintenance

costs, increasing efficiencies and helping to ensure a

comfortable indoor environment for patients and staff.

“The efficiency of the chilled water plant has exceeded our

expectations,” said William Burnett, director of engineering

and maintenance, Monongahela Valley Hospital. “The second

chiller was not even needed during our July heat wave.”

A Trane Tracer SC controller was integrated with existing controls

without a single moment of downtime.

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CASE-SLX355-EN August 04, 2013