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W | X |
Y | Z
Edge grain
A cut of wood taken at right angles to the rings of a
tree.
Efflorescence
The white mineral deposit left after water
passes through the foundation
wall bringing dissolved salts from the wall material. It appears on the
interior wall after the
water has evaporated.
Electric plenum
heater An auxiliary heater, usually added to an
oil-fired furnace, located
in the plenum.
Electric resistance
heating Baseboard convectors, wall mounted
strips, or floor inserts
that each operate as a separate heating plant.
Electrical meter
The meter provided by the utility company that
measures home electrical
use in watts.
Electrolytic
corrosion Corrosion that occurs when two
dissimilar metals are connected to
each other in water containing dissolved salts, releasing metal ions and
causing a current to
flow.
Electromotive force
The force that drives a current of electrons
through a given
resistance. Electromotive force, also called voltage, is measured in
volts.
Electronic vent
damper A damper in a smoke pipe that
automatically opens before the
burner starts and closes when exhaust gases cool down.
Equalizer
A loop of piping running from the top of a steam boiler
to the bottom that
balances pressure above and below the water line in the boiler.
Evaporator
A coil in a cooling system through which refrigerant
flows that causes the
refrigerant liquid to absorb heat which changes the liquid to a gas.
Evaporator cooler
A cooling system that uses the evaporation
process to cool and
moisturize the air for home cooling.
Expansion device
A device in a cooling system through which
refrigerant liquid flows that
depressurizes the liquid and cools it down.
Expansion tank
A tank in a hot water heating system that
provides space for water to
expand into. Tanks may be open or closed.
Extruded
polystyrene insulation Rigid board insulation
produced by extrusion. |