An insulation product composed of loose fibers or fiber pellets that are blown into building cavities or attics using special pneumatic equipment.

A vessel or tank where heat produced from the combustion of fuels such as natural gas, fuel oil, or coal is used to generate hot water or steam for applications ranging from building space heating to electric power production or industrial process heat.

The water that is forced into a boiler to take the place of that which is evaporated in the generation of steam.

A unit of rate of water evaporation equal to the evaporation per hour of 34.5 pounds of water at a temperature of 212 degrees Fahrenheit into steam at 212 degrees F.

The pressure of the steam or water in a boiler as measured; usually expressed in pounds per square inch gauge (psig).

The heating capacity of a steam boiler; expressed in Btu per hour (Btu/h), or horsepower, or pounds of steam per hour.

In reference to solid biomass fuels, such as wood, having zero moisture content.

A quantity of (solid) biomass fuel equal to 2,400 pounds bone dry.

A pump for circulating the heat transfer fluid in a hydronic heating system.

In heating and cooling system distribution ductwork, the transformation pieces connecting horizontal round leaders to vertical rectangular stacks.

The chemical element commonly used as the dopant in solar photovoltaic device or cell material.

A generic term for liquefied and pressurized gas, ordinarily butane, propane, or a mixture of the two, contained in a cylinder for domestic use.

A means to increase the thermal efficiency of a steam electric generating system by converting some waste heat from the condenser into electricity. The heat engine in a bottoming cycle would be a condensing turbine similar in principle to a steam turbine ...

A thermodynamic cycle using constant pressure, heat addition and rejection, representing the idealized behavior of the working fluid in a gas turbine type heat engine.

Water saturated or strongly impregnated with salt.

The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit; equal to 252 calories.

The space-conditioning load of a building.

The structural elements (walls, roof, floor, foundation) of a building that encloses conditioned space; the building shell.

A measure of the heating requirements of a building expressed in Btu per degree-day.

The relationship of a building to true south, as specified by the direction of its longest axis.