Glossary

A list of commonly used acronyms and abbreviations.

AC
alternating current: electric current which reverses direction approximately 60 times a second
AFUE
annual fuel utilization efficiency: rating that describes how efficient a heating system is over an entire heating season
BTU
British thermal unit: the amount of energy needed to cool or heat 1 pound of water by 1°F
BTU/h
British thermal units per hour: amount of British thermal units (the amount of energy needed to cool or heat 1 pound of water by 1°F) consumed in 1 hour
CFM
cubic feet per minute
CSA
Canadian Standards Association
DC
direct current: electric current that flows in 1 direction only
GHG
greenhouse gas: a gas in the atmosphere that traps energy from the sun
GWh
gigawatt-hours: electric power consumption of 1,000,000 kilowatt-hours (kWh)
HVDC
high voltage direct current: the transmission of direct current electricity, usually over long distances
Joule
joule: a standard unit of electrical energy equal to the work done when a 1 ampere current passes through a resistance of 1 ohm for 1 second
kV
kilovolt: a unit of potential energy equal to 1,000 volts
kVA
kilovolt-ampere: a unit of power equal to 1,000 volt-amperes
kW
kilowatt: a unit of power equal to 1,000 watts
kWh
kilowatt-hour: 1,000 watts of electrical energy produced in 1 hour
low-e
low emissivity: usually referring to windows coated with a thin, invisible, metallic layer that allows heat in and keeps UV rays out
MBH
a standard unit of electrical energy equal to thousands of British thermal units (BTU) per hour
MVA
megavolt amperes: a standard unit of electrical energy equal to 1 million volt-amperes (1 volt-ampere is equal to 1 watt)
MW
megawatt: a standard unit of electrical energy equal to 1,000,000 watts
MWh
megawatt hour: 1,000,000 watts of electrical energy produced in 1 hour