Energy terms starting with L

154 terms

101. Load Analysis Assessing and quantifying the discrete components that comprise a load. This analysis often includes time of day or season as a variable.
102. Load control The process of managing demand requirements in order to achieve a desired load pattern.
103. Load Duration Curve A curve that displays load values on the horizontal axis in descending order of magnitude against the percent of time (on the vertical axis) that the load…
104. Load factor The ratio of average energy demand (load) to maximum demand (peak load) during a specific period.
105. Load Forecast An estimate of power demand at some future period.
106. Load Leveling The deferment of certain loads to limit electrical power demand, or the production of energy during off-peak periods for storage and use during peak…
107. Load Management To influence the demand on a power source.
108. Load pocket An area often dependent on transmission for reliable electric system operation because the area’s load often exceeds the generation in the area.
109. Load Profile or Shape A curve on a chart showing power (kW) supplied (on the horizontal axis) plotted against time of occurrence (on the vertical axis) to illustrate the…
110. Load Shedding Turning off or disconnecting loads to limit peak demand.
111. Load Shifting A load management objective that moves loads from on-peak periods to off-peak periods.
112. Load-serving entity (LSE) Any entity, including a load aggregator or power marketer, that serves end-users within a control area and has been granted the authority or has an…
113. Loam A soil consisting of an easily crumbled mixture of clay, silt, and sand.
114. Local distribution company (LDC) Any firm, other than a natural gas pipeline, engaged in the transportation or local distribution of natural gas and its sale to customers that will…
115. Local Solar Time A system of astronomical time in which the sun crosses the true north-south meridian at 12 noon, and which differs from local time according to longitude…
116. Locatable Minerals Minerals or materials subject to disposal and development through the Mining Law of 1872 (as amended).
117. Location Efficient Mortgage A lending program that allows homebuyers to borrow more money based on the transportation cost savings of living near mass transit.
118. Locational installed capacity Installed capacity in a specific location (e.g., New York City), rather than in a broader area (e.g., anywhere in New York State).
119. Locational marginal price The market-clearing price for electricity at the location the energy is delivered or received.
120. LODE A mineralized ledge, vein or mineral deposit in place.
121. Lode mining claim A claim based on the presumption that the valuable mineral is a part of a bed-rock lode, vein, stockwork, stratum, or intrusion and is not dominantly a…
122. Loess A group of windblown soils, largely comprising silt, weakly cemented by calcite.
123. Log choker A length of cable or chain that is wrapped around a log or harvested tree to secure the log to the winch cable of a skidder or to an overhead cable…
124. Log Law In reference to a wind energy conversion system, the wind speed profile in which wind speeds increase with the logarithmic of the height of the wind…
125. Logging residues The unused portion of wood and bark left on the ground after harvesting merchantable wood.
126. long A term signifying ownership of securities. "I am long 100 XYZ," means that the speaker owns 100 shares of XYZ.
127. Long Ton A unit that equals 20 long hundredweight or 2,240 pounds. Used mainly in England.
128. Long-term productivity The capacity of a site to support forest ecosystems over generations of humans and trees as measured against some defined reference.
129. Long-Wave Radiation Infrared or radiant heat.
130. Loop flow Unintended or unscheduled flow of electricity through a line or system.
131. Loose Fill Insulation Insulation made from rockwool fibers, fiberglass, cellulose fiber, vermiculite or perlite minerals, and composed of loose fibers or granules can be…
132. Loss of Load Probability (LOLP) A measure of the probability that a system demand will exceed capacity during a given period; often expressed as the estimated number of days over a long…
133. Losses Energy (kilowatt-hours) and power (kilowatts) lost in the operation of an electric system, principally as waste heat in electrical conductors and…
134. Losses (Energy) A general term applied to the energy that is converted to a form that can not be effectively used (lost) during the operation of an energy producing…
135. Lot Area area is the total square footage of horizontal area included within the property lines.
136. Low Btu Gas A fuel gas with a heating value between 90 and 200 Btu per cubic foot.
137. Low Flush Toilet A toilet that uses less water than a standard one during flushing, for the purpose of conserving water resources.
138. Low Impact Development (LID) An approach to environmentally friendly land use planning. It includes a suite of landscaping and design techniques that attempt to maintain the natural…
139. Low-E Coatings & (Window) Films A coating applied to the surface of the glazing of a window to reduce heat transfer through the window.
140. Low-e windows Low-emittance (Low-E) refers to very thin coatings on a window primarily used to reduce heat flow through the window.
141. Low-Emissivity Windows & (Window) Films Energy-efficient windows that have a coating or film applied to the surface of the glass to reduce heat transfer through the window.
142. Low-Flow Solar Water Heating Systems The flow rate in these systems is 1/8 to 1/5 the rate of most solar water heating systems.
143. Low-income population Persons whose average family income is below the poverty line. The poverty line takes into account family size and age of individuals in the family.
144. Low-level magnetic fields Fields of force that are generated whenever electric current flows. The sun's average large-scale magnetic field, and the Earth's, exhibit a north and a…
145. Low-Pressure Sodium Lamp A type of lamp that produces light from sodium gas contained in a bulb operating at a partial pressure of 0.13 to 1.3 Pascal.
146. Lower (Net) Heating Value The lower or net heat of combustion for a fuel that assumes that all products of combustion are in a gaseous state. (See Net Heating Value below.)
147. Lower Heating Value (LHV) The heating value is the amount of heat released during the combustion of a specific substance, usually a fuel or food.
148. lower heating value (LLV) The heat produced by combusting one unit of a substance, at atmospheric pressure under conditions such that all water in the products remains in the form…
149. Lowest achievable emissions rate (LAER) Used to describe air emissions control technology. A rate of emissions defined by the permitting agency.
150. Lumen The cavity or channel within a tube or tubular organ such as a blood vessel or the intestine.
151. Lumens/Watt (lpw) A measure of the efficacy (efficiency) of lamps. It indicates the amount of light (lumens) emitted by the lamp for each unit of electrical power (Watts)…
152. Luminaire A complete lighting unit consisting of a lamp(s), housing, and connection to the power circuit.
153. Luminance The physical measure of the subjective sensation of brightness; measured in lumens.
154. Lux The unit of illuminance equivalent to 1lumen per square meter.