Absorber plate The component of a solar thermal collector that absorbs solar radiation and converts it to heat. It is most commonly made of metal or rubber and black in color. The fluid is then condensed with the heat of condensation rejected through a cooling tower. Cubic feet per minute of air, measured at conditions existing at the inlet flange of an air compressor, delivered by the compressor into the discharge line. An electronic device that controls the rotational speed of motor-driven equipment such as fans, pumps, and compressors.
Speed control is achieved by adjusting the frequency of the voltage wave applied to the motor.
Air source heat pump A type of heat pump that transfers heat from outdoor air to indoor air during the heating season, and works in reverse during the cooling season. A device used to transfer heat from one air stream to another air stream while keeping the two air streams physically separated. The ratio of light reflected by a surface to the light falling on it. APLV uses design temperature drops and flows and is a reflection of average flow conditions. Array Any number of solar photovoltaic modules, solar thermal collectors or reflectors connected together to provide electrical or thermal energy.