Open Site - Science: Energy: Bioenergy: Terminology: D

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Top: Science: Energy: Bioenergy: Terminology: D

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Diameter at breast height

(DBH) The diameter of a tree measured 4 feet 6 inches above the ground.

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Digester

An airtight vessel or enclosure in which bacteria decomposes biomass in water to produce biogas.

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Discount rate

A rate used to convert future costs or benefits to their present value.

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Downdraft gasifier

A gasifier in which the product gases pass through a combustion zone at the bottom of the gasifier.

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Dutch oven furnace

One of the earliest types of furnaces, having a large, rectangular box lined with firebrick (refractory) on the sides and top. Commonly used for burning wood. Heat is stored in the refractory and radiated to a conical fuel pile in the center of the furnace.