ENGINEERING MANUAL OF AUTOMATIC CONTROL
CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
384
DEFINITIONS
Booster Pump station: Maintains sections of a network (return
or supply pipe) in required pressure conditions. Used
in long networks or highly elevated sections.
Combined Heat & Power: Combines production of electricity
and heat for space (buildings) and processes (industrial)
Domestic Hot Water: Water controlled at a constant
temperature suitable for use in showers and hand
washing stations.
Differential Pressure Controller: Prevents too low or too high
hydraulic pressure at the building heat exchanger
substation. This improves the control performance of
the station.
Heat Exchanger Substation: Compact Station, controls the
radiator and DHW loop in a building.
Heat Exchanger: Also called a convertor, transfers heat from
the primary network to a secondary network.
Heat Surface Factor: A value corresponding to the
effectiveness of radiating surface. The value depends
upon the shape, size, and color.
Heat Transfer Station: Controls flow, pressure and temperature
in sections of a primary network.
Primary Network: Supply and return pipe for heating medium
(hot water or steam) from the heat/power plant to the
consumer heat exchanger.
Secondary Network: Supply and return pipe for heating
medium (actuator) from heat exchanger to radiators
or tabs.
PUMP, AIR OR WATER
THREE-WAY VALVE
TWO-WAY VALVE
CHECK VALVE
M
HEAT EXCHANGER
DIFFERENTIAL PRESSURE CONTROL
WATER STORAGE TANK
EXPANSION TANK
TI
01
OUTSIDE AIR
TI
31
ROOM
TEMPERATURE SENSORS
SURGE TANKS
M
JET PUMP
FLOW
M10674
SYMBOLS
Since District Heating is more common in Europe, District
Heating is based on information supplied by personnel in Europe.
The symbols used in Figures 126 through 143 are those commonly
used in Europe and are supplied here for convenience.
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