What is Infrared Heating
V1: The Theory of Infrared Heat
What is Infrared?
Infrared is a type of energy. How does infrared heat work? It heats people, floors, walls and other surfaces directly, without heating the air around them first. The result? Infrared heating provides an instant warming, similar to when the sun emerges from clouds on a chilly day.
Another important factor to consider in evaluating infrared applications is that the amount of energy that is absorbed, reflected or transmitted varies with the wavelength of the infrared energy and with different materials and surfaces. These and other important variables have a significant impact on heat energy requirements and performance. Infrared Emitters & Source Temperatures — The amount of radiant energy emitted from a heat source is proportional to the surface temperature and the emissivity of the material. This is described by the Stefan-Boltzmann Law which states that radiant output of an ideal black body is proportional to the fourth power of its absolute temperature. The higher the temperature, the greater the output and more efficient the source.
Heat the floor, not the ceiling...
With most conventional heating methods (radiation, re-radiation, conduction and convection), air must first be heated and then circulated to warm people and objects. That’s why conventional heating is controlled by thermostats that sense air temperature. As a result, it takes longer to heat people and objects because they’re warmed secondarily to the air around them.
Innovative infrared heating warms people, floors and other objects first, making it the most efficient, effective method of heating. It really shines when heating under diverse conditions, such as warehouses, storerooms and even the most immense structures imaginable. Warm people and objects, not the air that then rises to the ceiling.
Evaluating Infrared Sources Commonly available infrared sources include heat lamps, quartz lamps, quartz tubes, metal sheath elements, ceramic elements and ceramic, glass or metal panels. Each of these sources has unique physical characteristics, operating temperature ranges and peak energy wavelengths. (See characteristics chart below.) Source Temperature & Wave Length Distribution — All heat sources radiate infrared energy over a wide spectrum of wavelengths. As the temperature increases for any given source:
1. The total infrared energy output increases with more energy being radiated at all wavelengths.
2. A higher percentage of the infrared energy is concentrated in the peak wavelengths.
3. The energy output peak shifts toward the shorter (near infrared) wavelengths