User Manual

No variable frequency drives required
on chiller compressor motors
Demand Flow manages your chiller plant
with specialized control algorithms. These
algorithms require the conversion of con-
stant speed condenser pumps, chilled
water pumps, and cooling tower fans to
variable speed through the installation
of variable frequency drives (VFDs). The
VFDs allow the Demand Flow algorithms
to maintain optimal differential system
pressure, reduce excessive pumping
energy as well as equipment runtime
and increase system deliverable tonnage
on systems suffering from a diminished
refrigeration effect. Demand Flow does
not require costly VFDs on chiller com-
pressor motors.
Demand Flow is chiller agnostic;
it is not brand-specific to any one
chiller manufacturer and can be
implemented without voiding
equipment warranties.
Elegantly simple but
powerful solution
Continuous performance
monitoring
All plant functions automatically
optimized
The Demand Flow controller automati-
cally optimizes all plant functions. Typi-
cally, system access to Demand Flow is
available through a unique Graphical
User Interface (GUI). Siemens web-based
EMC software enables chiller plant sys-
tem performance monitoring from any-
where in the world via the Internet. EMC
is responsible for data accumulation,
reporting energy profiles and detailing
equipment operating parameters.
Demand Flow typically achieves
savings in five major areas of a
chilled water system:
– Cooling towers
– Condenser pumps
– Chillers
– Chilled water pumps
– Air handling units
Highlights
■
Specialized control
algorithms
■
No costly VFDs on chiller
compressor motors
■
Automatically optimizes
all functions
■
Control from anywhere
via Internet
Only Demand Flow™ from Siemens uses the variable pressure curve tech-
nology that optimizes central chilled water systems to reduce a plant’s total
energy consumption by 20 to 50%.
Reduce your chiller plant’s
energy consumption