Energy term

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Letter A

ABSORPTANCE -- The ratio of the radiation absorbed by a surface to the total energy falling on that surface described as a percentage. . ABSORBER or ABSORBER PLATE -- The component of a collector that absorbs solar radiation, converts it to heat energy and transfers the heat to a heattransfer medium - , .. ABSORPTION COLUMN/TOWER -- A tower or column which causes contact between a rising gas and a falling liquid so that part of the gas may be dissolved in the liquid. ABSORBER PLATE Absorber Collector panel- . ABSORPTANCE or ABSORPTION FACTOR -- the ratio of the absorbed radiant or luminous flux to the incident flux. The value of the absorption depends upon the mode of irradiation, the spectral composition and the state of polarization of the incident radiation. ( ) , . ABSORPTION GASOLINE A natural gasoline obtained by the absorption process. - . A.C. CURRENT or ALTERNATING CURRENT An electrical current whose polarity and intensity vary periodically with time (..) ACCESS CHARGE -- A charge paid by all market participants withdrawing energy from the ISO controlled grid. The access charge will recover the portion of a utility's transmission revenue requirement not recovered through the variable usage charge. - . . ACCIDENTAL VOLTAGE TRANSFER -- An overvoltage at supply frequency following contact or flashover between elements of systems at different voltages.

ACCUMULATED DOSE -- The sum of the absorbed doses received by the system considered regardless of whether it is exposed to radiation in a continuous or discontinuous fashion. ACTIVE POWER The time average over one cycle of the instantaneous input powers at the points of entry of a polyphase circuit. Active power in the alternative current circuit is determined by ( P = I U cos ) and in three-phase circuit by P = 3U I cos , respectively. Thus one horse-power (hp) equals 745.7 W. . , ( P = I U cos ) -, P = 3U I co . s ()- . (..) 745.7 - . ACTIVE SOLAR ENERGY -- Solar radiation used by special equipment to provide space heating, hot water or electricity. , . ACTIVE SOLAR ENERGY SYSTEM -- A system designed to convert solar radiation into usable energy for space, water heating, or other uses. It requires a mechanical device, usually a pump or fan, to collect the sun's energy. , . ACOP (Adjusted Coefficient of Performance) -- A standard rating term that was used to rate the efficiency of heat pumps in California. ACOP was replaced by Heating Seasonal Performance Factor (HSPF) in 1988. () ..- . 1988 - () . ADDITION -- An alteration to an existing building that increases conditioned space. . ADJUSTMENT BID -- A bid that is used by the ISO to adjust supply or demand when congestion is anticipated. - .. ADVERSE HYDRO -- Water conditions limiting the production of hydroelectric power. In years having below-normal levels of rain and snow, and in seasons having less-than-usual runoff from mountain snowpack, there is then less water available for hydro energy production. . ,

- . AFTERMARKET - broad term that applies to any change after the original purchase, such as adding equipment not a part of the original purchase. As applied to alternative fuel vehicles, it refers to conversion devices or kits for conventional fuel vehicles. . AGGREGATOR -- An entity responsible for planning, scheduling, accounting, billing, and settlement for energy deliveries from the aggregator's portfolio of sellers and/or buyers. Aggregators seek to bring together customers or generators so they can buy or sell power in bulk, making a profit on the transaction. , , . . AIR CHANGE -- The replacement of a quantity of air in a space within a given period of time, typically expressed as air changes per hour. If a building has one air change per hour, this is equivalent to all of the air in the building being replaced in a one-hour period. . . AIR CONDITIONER -- An assembly of equipment for air treatment consisting of a means for ventilation, air circulation, air cleaning, and heat transfer (either heating or cooling). The unit usually consists of an evaporator or cooling coil, and an electrically-driven compressor and condenser combination. , ( )- . , , . AIR FILM -- A layer of still air adjacent to a surface which provides some thermal resistance. . .

AIR FILM COEFFICIENT -- A measure of the heat transfer through an air film. [See ASHRAE Table 1, ASHRAE Handbook, 1985 Fundamentals] [1985 ASHRAE ASHRAE 1- ]. AIR-TO-AIR HEAT EXCHANGER -- A device with separate air chambers that transfers heat between the conditioned air being exhausted and the outside air being supplied to a building. AIR POLLUTION -- Unwanted particles, mist or gases put into the atmosphere as a result of motor vehicle exhaust, the operation of industrial facilities or other human activity. , , ALTERATION -- Any change or modification to a building's construction. [See Addition]. [ ]. AMBIENT AIR TEMPERATURE -- Surrounding temperature, such as the outdoor air temperature around a building. . ALCOHOL FUELS -- A class of liquid chemicals that have certain combinations of hydrogen, carbon and oxygen, and that are capable of being used as fuel. , , . ALTERNATING CURRENT -- (AC) Flow of electricity that constantly changes direction between positive and negative sides. Almost all power produced by electric utilities in the United States moves in current that shifts direction at a rate of 60 times per second. () - . 60 . ALTERNATIVE ENERGY SOURCES -- See RENEWABLE ENERGY. - . ALTERNATIVE (transportation) FUELS -- as defined by the National Energy Policy Act (EPAct) the fuels are: methanol, denatured ethanol and other alcohols, separately or in mixtures of 85 percent by volume or more (or other percentage not less than 70 percent as determined by U.S. Department of Energy rule) with gasoline or other fuels; CNG; LNG; LPG; hydrogen; "coalderived liquid fuels;" fuels "other than alcohols" derived from "biological materials;" electricity, or any other fuel determined to be "substantially not petroleum" and yielding "substantial energy security benefits and substantial environmental benefits."

( ) 85%- (- 70%- ) , , (), (), (), , , , , , . ACCOUNTABILITY -- The quantitative accounting for inventories and transfers of nuclear material through a system of measurements, records and reports. , . ALTERNATIVE FUEL VEHICLE (AFV) -- motor vehicles that run on fuels other than petroleum-based fuels. As defined by the National Energy Policy Act (EPAct), this excludes reformulated gasoline as an alternative fuel. . - . AMBIENT -- The surrounding atmosphere; encompassing on all sides; the environment surrounding a body but undisturbed or unaffected by it. . AMPLITUDE The maximum value of a periodically varying quantity during a cycle; eg the maximum displacement of a vibrating particle from its midposition, the maximum value of an alternating current, or the maximum displacement of a sine wave. A -- (t)- S = ASin(t + o) . AMPERE SI unit of electric current. Defined as that current which, if maintained in two parallel conductors of infinite length, of negligible crosssection, and placed 1 m apart in vacuum, would produce between conductors a force equal to 2 10 7 Nm 1 . Symbol A. Ampere is named after A. M. Ampere (1775-1836), franch physicist. 1 milliampere (mA) equal 0.001 and 1 mircampere (mcA) 0.000001 , respectively. -- . () 1 , 1 2 10 7 H . . . (1775-1836) . 1 () 0.001 - 1 () 0.000001 - . AMMETER An indicating instrument for measuring the alternating or direct current in an electric circuit.

() . AMPERE-HOUR Unit of charge, equal to 3600 coulumbs, or 1 ampere flowing for 1 hour. - 3600 , 1 . AMPERE-HOUR CAPACITY Capacity of an accumulator battery measured in ampere-hours, usually specified at a certain definite rate of discharge. It is also applicable to primary cells. - - . . AMPERE-HOUR EFFICIENCY -- In an accumulator, the ratio of the amperehour output during discharge to the ampere-hour input during charge. - -- - - . AMPERE-HOUR METER A meter designed to record the product of current and time (ampere-hours) for a given circuit or passing at a given point. If the voltage is constant, the meter can be calibrated as an energy (kilowatt-hour) meter. Symbol ahm. - . () . - ahm () . ANSI American National Standards Institute is the national organization that coordinates development and maintenance of consensus standards and sets rules for fairness in their development. ANSI also represents the USA in developing international standards. . - . ANCILLARY SERVICES The services other than scheduled energy that are required to maintain system reliability and meet WSCC/NERC operating criteria. Services that the Independent System Operator may develop, in cooperation with market participants, to ensure reliability and to support the transmission of energy from generation sites to customer loads. Such services include spinning, non-spinning, and replacement reserves, voltage control/support, a