Energy terminology · MLC-0117

Energy terms: H (72)

• H1. Hundred
• Half-lifeThe time it takes for an isotope to lose half of its radioactivity.
• Halogen lampA type of incandescent lamp that lasts much longer and is more efficient than the common incandescent lamp...
• Halogenated substancesA volatile compound containing halogens, such as chlorine, fluorine or bromine.
• Hand loadingAn underground loading method by which coal is removed from the working face by manual labor through the use...
• Haulage costCost of loading ore at a mine site and transporting it to a processing plant.
• HeadThe product of the water's weight and a usable difference in elevation gives a measurement of the potential...
• Heap leach solutionsThe separation, or dissolving-out from mined rock of the soluble uranium constituents by the natural action...
• Heat contentThe amount of heat energy available to be released by the transformation or use of a specified physical unit...
• Heat pumpHeating and/or cooling equipment that, during the heating season, draws heat into a building from outside...
• Heat pump (air source)An air-source heat pump is the most common type of heat pump. The heat pump absorbs heat from the outside air...
• Heat pump efficiencyThe efficiency of a heat pump, that is, the electrical energy to operate it, is directly related to...
• Heat pump (geothermal)A heat pump in which the refrigerant exchanges heat (in a heat exchanger) with a fluid circulating through an...
• Heat rateA measure of generating station thermal efficiency commonly stated as Btu per kilowatthour. Note: Heat rates...
• Heated floorspaceThe area within a building that is space heated.
• Heating Degree DaysA measure of how cold a location is over a period of time relative to a base temperature, most commonly...
• Heating equipmentAny equipment designed and/or specifically used for heating ambient air in an enclosed space. Common types of...
• Heating intensityThe ratio of space-heating consumption or expenditures to square footage of heated floor space and heating...
• Heating stove burning wood, coal, or cokeAny free-standing box or controlled-draft stove; or a stove installed in a fireplace opening, using the...
• Heating valueHeating value: A measure of the energy content of the physical unit of any combustible fuel. For a fuller...
• Heating value (natural gas)The average number of British thermal units per cubic foot of natural gas as determined from tests of fuel...
• Heavy gas oilPetroleum distillates with an approximate boiling range from 651 degrees Fahrenheit to 1000 degrees...
• Heavy metalsMetallic elements, including those required for plant and animal nutrition, in trace concentration but which...
• Heavy railAn electric railway with the capacity for a "heavy volume" of traffic and characterized by exclusive...
• Heavy waterWater containing a significantly greater proportion of heavy hydrogen (deuterium) atoms to ordinary hydrogen...
• Heavy-water-moderated reactorA reactor that uses heavy water as its moderator. Heavy water is an excellent moderator and thus permits the...
• HedgingThe buying and selling of futures contracts so as to protect energy traders from unexpected or adverse price...
• Hedging contractsContracts which establish future prices and quantities of electricity independent of the short-term market...
• HeliostatA mirror that reflects solar rays onto a central receiver. A heliostat automatically adjusts its position to...
• Henry HubA pipeline hub on the Louisiana Gulf coast. It is the delivery point for the natural gas futures contract on...
• HIDHigh-Intensity Discharge
• High efficiency ballastA lighting conservation feature consisting of an energy-efficient version of a conventional electromagnetic...
• High efficiency lightingLighting provided by high-intensity discharge (HID) lamps and/or fluorescent lamps.
• High Sulfur Diesel (HSD) fuelDiesel fuel containing more than 500 parts per million (ppm) sulfur.
• Higher Heating ValueA measure of heat content based on the gross energy content of a combustible fuel. Also known as "upper...
• High-intensity discharge (HID) lampA lamp that produces light by passing electricity through gas, which causes the gas to glow. Examples of HID...
• High-mileage householdsHouseholds with estimated aggregate annual vehicle mileage that exceeds 12,500 miles.
• High-temperature collectorA solar thermal collector designed to operate at a temperature of 180 degrees Fahrenheit or higher.
• HighwallThe unexcavated face of exposed over-burden and coal in a surface mine.
• Hinshaw pipelineA pipeline or local distribution company that has received exemptions from regulations pursuant to the...
• Holding companyA company that confines its activities to owning stock in and supervising management of other companies. The...
• Holding pondA structure built to contain large volumes of liquid waste to ensure that it meets environmental requirements...
• Horizontal axis wind turbineThe most common type of wind turbine where the axis of rotation is oriented horizontally. Also see Wind...
• Horizontal wellA subset of directional wells, where the wellbore orientation deviates more than 80 degrees from vertical...
• HorsepowerA unit for measuring the rate of work (or power) equivalent to 33,000 foot-pounds per minute or 746 watts.
• Host governmentThe government (including any government-controlled firm engaged in the production, refining, or marketing of...
• Hot dry rockHeat energy residing in impermeable, crystalline rock. Hydraulic fracturing may be used to create...
• Hot tubWater-filled wood, plastic, or ceramic container in which up to 12 people can lounge. Normally equipped with...
• Hours under loadThe hours the boiler is operating to drive the generator producing electricity.
• HouseholdA family, an individual, or a group of up to nine unrelated persons occupying the same housing unit. "Occupy"...
• Household energy expendituresThe total amount of funds spent for energy consumed in, or delivered to, a housing unit during a given period...
• Housing unitA house, an apartment, a group of rooms, or a single room if it is either occupied or intended for occupancy...
• HTGRHigh Temperature Gas-cooled Reactor
• Hub heightIn a horizontal-axis wind turbine, the distance from the turbine platform to the rotor shaft.
• HumidifierA humidifier adds moisture to the air(often needed in winter when indoor air is very dry). It may be a...
• HumidityThe moisture content of air. Relative humidity is the ratio of the amount of water vapor actually present in...
• HVACAn abbreviation for the heating, ventilation, and air-conditioning system; the system or systems that...
• HVAC conservation featureA building feature designed to reduce the amount of energy consumed by the heating, cooling, and ventilating...
• HVAC DSM programA DSM (demand-side management)program designed to promote the efficiency of the heating or cooling delivery...
• Hybrid electric vehicleCombines an Internal combustion engine (ICE) with a battery pack, regenerative braking, and an electric motor...
• Hybrid transmission lineA double-circuit line that has one alternating current and one direct circuit. The AC circuit usually serves...
• Hydraulic fracturingA process that stimulates or increases production and ultimate recovery from a well by pumping a fluid and a...
• Hydraulic headThe distance between the respective elevations of the upstream water surface (headwater) above and the...
• HydrocarbonAn organic chemical compound of hydrogen and carbon in the gaseous, liquid, or solid phase. The molecular...
• Hydrocarbon gas liquidsA group of hydrocarbons including ethane, propane, normal butane, isobutane, and natural gasoline, and their...
• HydrochlorofluorocarbonsChemicals composed of one or more carbon atoms and varying numbers of hydrogen, chlorine, and fluorine atoms.
• Hydroelectric powerThe use of flowing water to produce electrical energy.
• HydrofluorocarbonsA group of man-made chemicals composed of one or two carbon atoms and varying numbers of hydrogen and...
• HydrogenThe lightest of all gases, occurring chiefly in combination with oxygen in water; exists also in acids...
• Hydrogen sulfideA colorless gas known for its strong "rotten egg" odor at low concentrations. H2S is highly toxic and...
• Hydroxyl radicalAn important chemical scavenger of many trace gases in the atmosphere that are greenhouse gases. Atmospheric...
• Hypothetical resources (coal)Undiscovered coal resources in beds that may reasonably be expected to exist in known mining districts under...

72 of 2,515 terms in Energy terminology (MLC-0117). Request the full dataset.