SONAR—Sound Navigation and Ranging.
STAR CONNECTED—Shaped like the letter Y.
SUBMICRON—Less than one millionth of a meter.
SW/DW—Seawater/distilled water.
SYNCHRO—A small motor-like analog device that
operates like a variable transformer and is used
primarily for the rapid and accurate transmission
of data among equipments and stations.
T
TEMPERATURE GRADIENT—The rate of tem-
perature change between the primary inlet
temperature and the secondary outlet tem-
perature.
TEMPERATURE COEFFICIENT—The amount of
change of resistance in a material per unit of
change in temperature.
TRUE BEARING—Angle between a target and true
north measured clockwise in the horizontal
plane.
TRUE NORTH—Geographic North.
V
VENTURI-TYPE—Having a throat-like passage that
increases the velocity and lowers the pressure of
a fluid conveyed through it.
W
WATERBOX—A part of the heat exchanger, also
called the bonnet. Installed at the end of the
heat exchanger to access the tubes for cleaning.
WATT—International unit of power, equal to one
joule per second.
WYE CONNECTED—A three-phase connection in
which each winding is connected to a command
ground forming a connection that resembles the
letter Y.
Z
ZINC ANODE—Disks, rods, bars, or plates made of
zinc metal and installed in the heat exchangers
water box.
AI-4
