Ochsner Medical Center



Ochsner Medical Center
Ochsner Medical Center
Ochsner Medical Center gains control, reduces energy consumption
with Siemens Demand Flow® Solution.
“ I know that it takes less
energy, but mostly, the
redesigned system is a lot
easier for me to control.
Before, I had to look at four
systems for my one chilled
water plant. But now I can
see everything, for every
building, in one place.”
Terry Dillenkoffer
Manager & Chief Engineer
Facilities Management
Ochsner Medical Center
Ochsner Medical Center is located just
outside New Orleans on Jefferson Highway
and is part of Louisiana’s largest non-profit
academic healthcare system: Ochsner
Health System. Since opening in 1942,
Ochsner Health System has since grown
to eight hospitals and 38 health centers,
employing more than 12,000 people and
750 physicians.
automate the plant and reduce total plan
energy consumption. Ochsner Health
System identified several key goals when
it engaged Siemens:
Over the decades, Ochsner Medical Center
added several buildings to its campus. As
the medical center expanded, so did its
central plant. During the expansion, many
manual processes of plant operation
remained in place while some system
components were added, such as pumps,
which were not necessary for optimal
system function and energy efficiency.
Some of the additional pumps actually
created problems with the system’s
ability to cool effectively and efficiently.
– Improve efficiency by eliminating
unnecessary system components
Client Objectives
Ochsner Health System turned to Siemens
to reduce operating costs for Ochsner
Medical Center central plant. Siemens was
contracted to simplify the system’s design,
– Gain control over central chilled water
plant with a single chilled water
automation system
– Optimize plant performance by automating and reengineering manual processes
– Decrease costs by reducing the total
chilled water plant energy consumption
Siemens Solutions
Siemens implemented its Demand Flow
solution, a turnkey solution that optimized
the chilled water system, in approximately
eight months. It optimized pumping and
chiller production to exactly meet the demand of the facility. The solution enabled
the removal of unnecessary pumps, thereby
reducing energy consumption required
to operate the pumps, and was able to
maintain optimum system pressure and
Answers for infrastructure.
Demand Flow is a patent-pending, proven
control strategy for chiller plant optimization that reduces a central plant’s total
energy consumption by 20-50%. It offers
a holistic approach for the entire chilled
water system, including potential airside
savings. This optimization increases the
deliverable tonnage and simplifies plant
operations and controls, without sacrificing
occupant comfort. Demand Flow’s
specialized algorithms can deliver
chilled water system efficiencies to any
existing building automation system.
As part of the project, Siemens installed
70 Variable Frequency Drives (VFDs) on the
pumping systems, installed new high-accuracy temperature sensors and flow meters
and reprogrammed the sequence of
operations for the chiller plant. VFDs on
the chiller compressor motors were not
required as part of the Demand Flow
solution; however, the optimization of the
pumping systems enables the reduction of
chiller compressor energy. The increased
plant efficiency also leads to increased
system deliverable tonnage and reduced
plant runtime.
Client Results
Prior to Siemens implementation of the
Demand Flow solution, there were four
building automation systems serving various
parts of the facilities. All four needed to
be monitored to operate the campus’ one
chilled water system. Today, the Demand
Flow solution has provided the facility
engineers with a single system where
Siemens Industry, Inc.
Infrastructure & Cities Sector
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089
Tel: (847) 215-1000
Fax: (847) 215-1093
they can view, track, trend, and manage
all of the chilled water system’s critical data
from a single head end.
nnual energy savings
of $1,033,000
Monthly savings of $86,000
guaranteed by Siemens
Reduction of 19,656,000
pounds of CO2 per year
– Reduction of 19,656,000 pounds of CO2/yr
– Chiller ton-hours reduction of an average
of 1.1 million per month, or 26.6%
Chiller ton-hours reduced
by 26.6%
Annual electricity usage
reduced by 36.3%
In the first year following implementation,
the project achieved:
– Annual savings of $1,033,000/yr or
15,590,763 kWh/yr
– Electric kWh reduction of an average of
1.3 million per month, or 36.3%
– Efficiency kW/ton improvement of 16.2%
Siemens guaranteed an average $86,000 in
monthly savings generated by Demand Flow
and completed the project on schedule. It
did not need to provide temporary cooling,
which helped reduce the overall costs of the
project. Most importantly, patient care was
not adversely affected by the implementation of Demand Flow.
The information in this document contains general descriptions of technical options
available, which do not always have to be present in individual cases. The required
features should therefore be specified in each individual case at the time of closing
the contract.
03/12 | Printed in USA | 153-SBT-411
© 2012 Siemens Industry, Inc.