Top: Science: Energy: Bioenergy: Terminology: H




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Habitat

The area where a plant or animal lives and grows under natural conditions. Habitat includes living and non-living attributes and provides all requirements for food and shelter.


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Hardwoods

Usually broad-leaved and deciduous trees.


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Heat Rate

The amount of fuel energy required by a power plant to produce one kilowatt-hour of electrical output. A measure of generating station thermal efficiency, generally expressed in Btu per net kWh. It is computed by dividing the total Btu content of fuel burned for electric generation by the resulting net kWh generation.


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Heat transfer efficiency

useful heat output released / actual heat produced in the firebox.


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Heating value

The maximum amount of energy that is available from burning a substance.


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Hectare

Common metric unit of area, equal to 2.47 acres. 100 hectares = 1 square kilometer.


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Herbaceous

Non-woody type of vegetation, usually lacking permanent strong stems, such as grasses, cereals and canola (rape).


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Higher heating value

(HHV) The maximum potential energy in dry fuel. For wood, the range is from 7,600 to 9,600 Btu/lb (17.7 to 22.3 GJ/t).


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Horsepower

(electrical horsepower; hp) A unit for measuring the rate of mechanical energy output, usually used to describe the maximum output of engines or electric motors. 1 hp = 550 foot-pounds per second = 2,545 Btu per hour = 745.7 watts = 0.746 kW


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Hydrocarbon

Any chemical compound containing hydrogen, oxygen, and carbon.



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