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Cogeneration Systems

Systems using fossil fuel, geothermal energy, wind, or solar energy to produce electricity and heat.

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Collar beam

Nominal 1- or 2-inch-thick members connecting opposite roof rafters. They serve to stiffen the roof structure.

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Cofferdam

A temporary watertight enclosure around an area of water-bearing soil or an area of water from which water is pumped allowing construction to take place in the water-free area.

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Cohesion

The molecular forces between particles within a body which acts to unite them.

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Cold air return

The ductwork (and related grills) that carries room air back to the furnace for re-heating.

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Cohesive Soil

A soil that when unconfined has considerable cohesion when submerged and considerable strength when air dried.

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Collar

Preformed flange placed over a vent pipe to seal the roofing above the vent pipe opening. Also called a vent sleeve.

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Collector Street

A street into which minor streets empty and which leads to a major arterial.

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Cold-Rolled Steel

Steel rolled to the final desired shape at a temperature at which it is no longer plastic.

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Cohesionless Soil

A soil that when unconfined has little or no cohesion when submerged and no significant strength when air dried.

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Compression

The conditions of being shortened (compressed) by force.

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Combustion chamber

The part of a boiler, furnace or woodstove where the burn occurs; normally lined with firebrick or molded or sprayed insulation.

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Combustion air

The duct work installed to bring fresh, outside air to the furnace and/or hot water heater. Normally 2 separate supplies of air are brought in: One high and One low.