SYS-APM001-EN
Glossary
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evaporator
The region in the chiller where the system chilled water is
continuously cooled down by flashing the refrigerant to vapor in a deep
vacuum as it picks up heat from the returning system water.
fouling
Deposits of foreign material in the water side of tubing in refrigeration
condensers or chillers which affect the transfer of heat.
heat exchanger
A device used to transfer heat between two physically
separated fluids.
heat transfer
The movement of heat from one body or substance to another.
The three methods of heat transfer are conduction, convection and radiation.
load
Any one of several output devices that are to be controlled by a building
management panel.
mechanical-compression refrigeration cycle
The electrically driven chiller
makes use of an electric motor, driving a compressor to produce chilled water
for cooling. It does this via a mechanical process that uses a refrigerant for a
working fluid. Inside the vessel are pressure and temperature differentials,
where heat is absorbed at a low temperature and then rejected at a higher
temperature.
psychrometric chart
A chart that shows the relationship between the
temperature, pressure, and moisture content of the air.
psychrometric measurement
The measurement of temperature, pressure,
and humidity of air using a psychrometric chart.
pumps (system)
chilled water
Circulates the chilled water through the evaporator section
of the chiller and then through the building coils.
cooling water
Circulates the cooling water from the source through the
chiller, condenser, and back to the source.
shell-and-tube
A designation for a type of heat exchangers consisting of a
tube bundle within a shell or casing. Often used in chiller condensers and
evaporators.
shell-and-tube flooded evaporators
Evaporators that use water flow through
tubes built into a cylindrical evaporator with refrigerant on the outside of the
tubes.
temperature, ambient
The temperature of the air surrounding the object
under consideration
temperature, wet-bulb
A measure of the degree of moisture in the air. It is the
temperature of evaporation for an air sample, measured with a thermometer
that has its bulb covered by a moistened wick.
tower water
See cooling water.