The device in an air conditioner or heat pump through which the refrigerant is circulated and releases heat to the surroundings when a fan blows outside air over the coils. This will return the hot vapor that entered the coil into a hot liquid upon exitin ...

A room that faces south (in the northern hemisphere), or a small structure attached to the south side of a house.

The low effective temperature of the sky on a clear night.

Consists of businesses that are not engaged in transportation or manufacturing or other types of industrial activities. Standard Industrial Classification (SIC) codes for commercial establishments are 50 through 87, 89, and 91 through 97.

The production of hydrogen using a photoelectrochemical cell.

The force per unit area acting on the surface of a solid boundary parallel to the flow.

An investment in a power plant or demand side management measures or programs, that become uneconomical due to increased competition in the electric power market. For example, an electric power plant may produce power that is more costly than what the mar ...

The component of a central air conditioner that is designed to remove heat absorbed by the refrigerant and transfer it outside the conditioned space.

A hydropower facility that stores water in a reservoir during high-inflow periods to augment water during low-inflow periods. Storage projects allow the flow releases and power production to be more flexible and dependable. Many hydropower project operati ...

A condition that can occur in a solar collector if the working fluid does not circulate when sun is shining on the collector.

A type of photovoltaic device in which the electricity induced in the cell is used immediately within the cell to produce a chemical, such as hydrogen, which can then be withdrawn for use.

A small groove scribed into the surface of a solar photovoltaic cell which is filled with metal for contacts.

The generation of electricity or shaft power by an energy conversion system and the concurrent use of rejected thermal energy from the conversion system as an auxiliary energy source.

The process by which a power plant, apparatus, or building is approved for operation based on observed or measured operation that meets design specifications.

The volume of a unit weight of a substance at a specific temperature and pressure.

The ratio of power produced by a wind energy conversion device to the power in a reference area of the free windstream.

An instrument for measuring relative humidity by means of wet and dry-bulb temperatures.

A type of heating system in which the heat transfer fluid circulates from the heating component to a heat exchanger that is immersed in a heat storage media, passing its heat to the storage media without physically contacting it.

The height above the ground that a horizontal axis wind turbine's hub is located.

A type of solar thermal collector that has tubes (pipes) that the heat transfer fluid flows through that are connected to a flat absorber plate.