Gas infrared radiators: light or dark?the Sun transfer the thermal energy to the Earth`s surface from which air heats up subsequently. Heating happens due to absorption by a surface of objects of energy of electromagnetic radiation to its transformation to heat. By this principle modern gas infrared radiators (heaters) work.
Gas infrared radiators burn gas for heating of the special radiating surface which is warmed by direct contact with the burned gases. Radiation of infrared radiators can be as in seen (light infrared radiators), and in invisible (infrared) part of a range (dark and superdark radiators).
In 30 - e years of last century appeared the first infrared ceramic heaters - light. A radiation source - a porous ceramic plate which heats up flameless superficial combustion of gas to temperature of 800 - 1000 °C. At this temperature electromagnetic radiation with the wavelength from 2,1 to 3,0 microns is formed. The wave of this length extends almost rectilinearly and almost without loss passes through air. Radiant efficiency of light gas radiators makes from 50 to 75%. They reach high intensity of radiation, the area of radiation is rather accurately limited.
Light radiators have the small sizes. And it is rather a shortcoming, than advantage. Malenkaya Square of the radiating surface leads to the high density of a thermal stream. From - for it it is difficult to receive the uniform temperature field, there are thermal spots between which difference is very notable, causes discomfort in people. In a zone of radiation there can come heating of a darkness of the head to temperature of more than 25 °C that is the most admissible border of hygienic norm. Combustion of gas on surfaces of a ceramic plate and impossibility of withdrawal of products of combustion imposes more strict requirements to application of light radiators on fire and hygienic norms.
Earlier these radiators were used generally for technological heating - drying of paper at cellulose combines, for defrosting of cars etc. Further their began to use for heating and heating of industrial facilities. Experts recommend to apply light radiators to local heating of workplaces on open and half-open areas, and also to heating of inert materials.
In 70 - e years appeared dark infrared heaters when which developing many defects of light were eliminated. Today they are applied in all industries. The radiating surface is made of heat resisting steel. In a dark infraizluchatel mix of air and gas is burned in the metal closed pipe which is warmed with a flame and products of combustion. Increase in the sizes of a radiator leads up to 350 - 450 °C to reduction of its superficial temperature. The radiator imitates the radiation of uniform intensity which maximum is in area 4,1 - 8,1 microns.
The design of dark radiators allows to regulate qualitatively process of burning and to exercise control of emission of products of combustion, at combustion gases there are only natural products of burning of natural gas. Also there is a possibility of the closed removal of products of combustion from the heated room without application additional pritochno - exhaust ventilation. Thus, dark gas radiators are the most economic, ecologically safe, and therefore most perspective way of heating of the industrial enterprises.