A space heating device that burns pellets; are more efficient, clean burning, and easier to operate relative to conventional cord wood burning appliances.

A unit of measurement for the ability of a material to retard the diffusion of water vapor at 73.4 F (23 C). A perm, short for permeance, is the number of grains of water vapor that pass through a square foot of material per hour at a differential vapor p ...

The effect of cooling by the radiation of heat from a building to the night sky.

A device for converting continuous circular motion into reciprocating rectilinear motion.

A curve that indicates the number of hours per year that specific wind speeds occur.

A unit or measure of electricity supply or consumption of 1,000 Watts over the period of one hour; equivalent to 3,412 Btu.

A turbine that is driven by high velocity jets of water or steam from a nozzle directed to vanes or buckets attached to a wheel. (A pelton wheel is an impulse hydroturbine).

Fuel gas with a heating value of between 200 and 300 Btu per cubic foot.

The arrangement, proportion, and design of windows in a building.

The decomposition of organic material to alcohol, methane, etc., by organisms, such as yeast or bacteria, usually in the absence of oxygen.

A battery-powered electrically driven vehicle.

The amount of work accomplished by electrical power, usually measured in kilowatt-hours (kWh). One kWh is 1,000 Watts and is equal to 3,413 Btu.2.The energy of moving electrons.

A raw material that can be converted to one or more products.

A registered trademark name for houses built with tires, aluminum cans, and earth.

An idealized process in which a working fluid (water, air, ammonia, etc) successively changes its state (from a liquid to a gas and back to a liquid) for the purpose of producing useful work or energy, or transferring energy.

In a wind energy conversion system, to pitch the turbine blades so as to reduce their lift capacity as a method of shutting down the turbine during high wind speeds.

The quantity of heat necessary to raise the temperature of a specific mass of a substance by one degree.

The flow of heat from one area to another by conduction, convection, and/or radiation. Heat flows naturally from a warmer to a cooler material or space.

A device that tracks the movement of the sun; used to orient solar concentrating systems.

A heat exchanger for recovering heat from flue gases for heating water or air.