Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| electric power | time rate of generating, transferring, or using
electric energy, expressed in watts (W) or kilowatts (kW). |
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| electric power demand charge |
part of an electric bill based on kilowatt
demand and the demand interval, expressed in dollars per kilowatt. Note: Demand charges offset construction
and maintenance of a utility’s need for large generating capacity. |
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| electric power demand interval |
period during which kilowatt demand is monitored
by a utility service, usually 15 or 30 minutes. |
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| electric power demand load | actual load on a circuit at any time. Sum of all
loads which are ON. Equal to the connected load minus the loads that are OFF |
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| electric power demand period |
electric power demand interval |
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| electric power load factor (ELF)(diversi |
comparison of electricity use to electric
demand. Calculated by dividing electricity usage in kilowatt-hours (kWh) by the
product of electric demand in kilowatts (kW) times the hours in the period
under consideration. |
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| electric power load shedding |
control method of stopping selected power uses
to avoid overloading power supply, or to avoid demand charges. |
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| electrical conductance | reciprocal (opposite) of resistance. The current
carrying capacity of any wire or electrical component. |
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| electrical conductor | common neutral neutral electrical conductor that
is common to, or serves more than one, circuit. |
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| electrical demand |
1.
kilowatt load averaged over a specified time (usually l5 or 30 minutes). The
demand for any given interval is that value of power in kilowatts that, if held
constant over the interval, accounts for the same consumption of electrical
energy as the real power. The average of the real power over the demand
interval. This is commonly identified as the block interval method.
2.
(electric power utilization) load integrated over a specified time interval.
3.
(installation or system) load at the receiving terminals averaged over a
specified interval expressed in kilowatts, kilovolt-amperes, kilovars, amperes,
or other suitable units. |
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