Biomass converted directly to energy or converted to liquid or gaseous fuels such as ethanol, methanol, methane, and hydrogen.

A mechanical device used for air circulation and to provide cooling.

A material or structural element that inhibits air flow into and out of a building's envelope or shell. This is a continuous sheet composed of polyethylene, polypropylene, or extruded polystyrene. The sheet is wrapped around the outside of a house during ...

The control of the quality, quantity, and temperature-humidity of the air in an interior space.

The negative pole or electrode of an electrolytic cell, vacuum tube, etc., where electrons enter (current leaves) the system; the opposite of an anode.

A condition that results from an imbalance between the number of protons and the number of electrons in a substance.

A device that cuts off the flow of hot or cold air to or from a room as controlled by a thermostat.

The purpose for which useful energy or work is consumed.

Consist of three main layers. The top layer is near ambient and has low salt content. The bottom layer is hot, typically 160 F to 212 F (71 C to 100 C), and is very salty. The important gradient zone separates these zones. The gradient zone acts as a tran ...

A device that cools air by removing moisture from it.

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

A colorless, pungent, gas (NH3) that is extremely soluble in water, may be used as a refrigerant; a fixed nitrogen form suitable as fertilizer.

The maximum load that a motor is capable of supplying.

A building structural element that is built onto a building's exterior along the inner edges of all the windows, and extending from the ground to the eaves. Wingwalls help ventilate rooms that have only one exterior wall which leads to poor cross ventilat ...

A device that moves and/or circulates air and provides ventilation for a room or a building.

Energy systems supply individual, or small-groups, of energy loads.

The total cost of production divided by the total quantity produced.

A combustion heating appliance that vents the combustion by-products directly into the heated space. The latest models have oxygen-sensors that shut off the unit when the oxygen level in the room falls below a safe level.

Heat stored above room temperature (in a solar heating system).

A popular term for "non-conventional" transportation fuels derived from natural gas (propane, compressed natural gas, methanol, etc.) or biomass materials (ethanol, methanol).