Radiant heaters are divided into two categories based on how hot the radiant emitter (heat exchanger) gets. What types of Radiant heaters are there, and what are the differences? Remember – radiant heaters are most commonly controlled by thermostats, and thermostats measure air temperature, not the temperature of the objects in a room! When the mass in a building (floors, walls, objects) are warmed after absorbing the infrared energy directly, a portion of that heat energy is transmitted into the air via the process of convection. While it is true that air is not used as the medium to transmit the heat, the air is indeed heated when radiant heaters are used. The answer is that radiant heaters do both! It is a common misconception that radiant heaters do not heat the air in a building. You are able achieve your required temperatures with fewer BTU’s, while using less fuel, and while ensuring that your fuel dollars are spent where they are needed most – heating the people, air, and objects within the room.ĭo radiant heaters heat the objects in a space, or the air? Radiant tube heating allows you to directly heat your target areas. As the air becomes hotter, it rises to the ceiling, heating hundreds of cubic feet of unused space before heating the floor, surfaces, and people within the space. Other methods of heating rely on raising the temperature of large volumes of air in order to raise the ambient temperature of the room. Radiant tube heaters operate in the very same way – heat is transmitted directly to people, objects, and surfaces which then release the heat via convection to the surrounding air. As the surface warms, it releases that heat into the surrounding area by the process of convection. Infrared energy (heat) from the sun impacts the Earth and raises the temperature of the Earth’s surface. Radiant heaters heat an area in the same way that the sun warms the Earth. The energy output peak shifts toward the shorter (near infrared) wavelengths A higher percentage of the infrared energy is concentrated in the peak wavelengths.ģ. The total infrared energy output increases with more energy being radiated at all wavelengths.Ģ. As the temperature increases for any given source:ġ. Source Temperature & Wave Length Distribution - All heat sources radiate infrared energy over a wide spectrum of wavelengths. Each of these sources has unique physical characteristics, operating temperature ranges and peak energy wavelengths. Warm people and objects, not the air that then rises to the ceiling.Įvaluating Infrared Sources Commonly available infrared sources include heat lamps, quartz lamps, quartz tubes, metal sheath elements, ceramic elements and ceramic, glass or metal panels. It really shines when heating under diverse conditions, such as warehouses, storerooms and even the most immense structures imaginable. Innovative infrared heating warms people, floors and other objects first, making it the most efficient, effective method of heating. As a result, it takes longer to heat people and objects because they’re warmed secondarily to the air around them. That’s why conventional heating is controlled by thermostats that sense air temperature. With most conventional heating methods (radiation, re-radiation, conduction and convection), air must first be heated and then circulated to warm people and objects. The higher the temperature, the greater the output and more efficient the source. 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. 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. These and other important variables have a significant impact on heat energy requirements and performance. The result? Infrared heating provides an instant warming, similar to when the sun emerges from clouds on a chilly day.Īnother 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. How does infrared heat work? It heats people, floors, walls and other surfaces directly, without heating the air around them first.
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