Luminous radiant gas heater – also known as infrared heater – emit thermal radiation in the wavelength spectrum visible to the human eye – hence the name. Common luminous radiant gas heaters are working with gaseous fuel that is premixed with the necessary amount of air in a special Injector, so-called premix systems. The homogenised gas / air mixture passes through a perforated ceramic plaque on who’s surface the combustion process takes place. With operating temperatures of 850 to 950 ° C the ceramic combustion surface starts glowing and becomes the radiating surface. The ceramic radiating surface is partially surrounded by elaborate reflectors who collect and direct the infrared radiation to the space to be heated.
Modern luminous radiant gas heater constructions, so-called combi-radiator, use the reflector surface heated by the exhaust gasses as additional radiating surfaces. Luminous radiant gas heaters are installed under the ceiling or upper walls areas. Similar to radiant tube gas heaters with luminous radiant gas heaters minimum installation heights of at least 3.5 to 9m must be observed to avoid areas with high radiation intensities.
The heat up time is very short. No more than 5 minutes after turning on the full radiation intensity is reached. In medium and large hall buildings multiple individual heaters need to be installed for even coverage to meet heat demand.
With surface tempertures of 850 to 950 °C combustion takes place directly on the ceramic plaque where a large amount of the generated heat is converted into infrared heat radiation. The forming of NOX is suppressed.