Ceiling panels that contain electric resistance heating elements embedded within them to provide radiant heat to a room.
Radiant energy efficiency
Energy that transmits away from its source in all directions.
Radiant floor
A type of radiant heating system where the building floor contains channels or tubes through which hot fluids such as air or water are circulated. The whole floor is evenly heated. Thus, the room heats from the bottom up. Radiant floor heating eliminates the draft and dust problems associated with forced air heating systems.
Radiant floor heating
Heating system where electrical or hot-water heating elements are installed in a concrete slab floor.
Radiant heating
A heating system where heat is supplied (radiated) into a room by means of heated surfaces, such as electric resistance elements, hot water (hydronic) radiators, etc.
Radiation
The transfer of heat directly from one surface to another (without heating the intermediate air acting as a transfer mechanism).
Radiative cooling
The process of cooling by which a heat absorbing media absorbs heat from one source and radiates the heat away.
Radiator
A room heat delivery (or exchanger) component of a hydronic (hot water or steam) heating system; hot water or steam is delivered to it by natural convection or by a pump from a boiler.
Radiator vent
A device that releases pressure within a radiator when the pressure inside exceeds the operating limits of the vent.
Radioactive decay
The disintegration of the nuclei of the atoms of radioactive (charged) elements with the concomitant release of alpha, beta, or gamma rays.
