Coal

Coal

Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.

Industry: Energy

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Coal

Pvcs that convert sunlight directly into energy

Energy; Coal

A method for producing energy by converting sunlight using photovoltaic cells (PVCs) that are solid-state single converter devices. Although currently not in wide usage, commercial customers have a ...

Site energy

Energy; Coal

The Btu value of energy at the point it enters the home, sometimes referred to as "delivered" energy. The site value of energy is used for all fuels, including electricity.

Continuous auger machine

Energy; Coal

Underground mining equipment. Used in mining coalbeds less than 3 feet thick. The auger has a cutting depth of about 5 feet and is 20 to 28 inches in diameter. Continuous auger mining usually uses a ...

Open refrigeration unit

Energy; Coal

Refrigeration in cabinets (units) without covers or with flexible covers made of plastic or some other material, hung in strips or curtains (fringed material, usually plastic, that push aside like a ...

Quadrillion

Energy; Coal

The quantity 1,000,000,000,000,000(10 to the 15th power).

Site energy consumption

Energy; Coal

The Btu value of energy at the point it enters the home, building, or establishment, sometimes referred to as "delivered" energy.

Continuous mining machine

Energy; Coal

Underground mining equipment. Used during continuous mining, cuts or rips coal from the face and loads it into shuttle cars or conveyors in one operation. It eliminates the use of blasting devices ...