Radiant heaters

This name can be used to describe heating elements that give off heat with a clear advantage of radiation over convection.. These are heating pipes placed near one of the partitions of heated rooms (most often their ceiling) or directly built into the partition (heating coils). The so-called radiating slabs are suspended under the ceiling of large rooms (factory halls, warehouses, etc.). It is usually a greater number of pipes connected to the heating plate through which the high temperature water flows, covered from above with an insulating element in order to limit unfavorable radiation towards the top.

Diagrams of radiating plates. Marks: A-with an insulating layer, e.g.. of glass wool, B - with housing, C – with air inlet, 1 – heating cables, 2 – insulating material, 3 – steel plate, 4 – sheet steel housing, 5 – air duct.

The radiating plates can be mounted not only horizontally under the ceiling, but also vertically at the outer partition, and even from any angle, creating the so-called. strip radiant heaters. They are used in halls to ensure quick heating and to obtain a small vertical temperature gradient of rooms, such plates are often operated with a medium of high temperature (for example. steam or water with a temperature higher than + 100 ° C). Among the discussed heating systems there are also the so-called. gas or electric heaters, which are outside the scope of the study. The second type of radiant heaters is the so-called. heating surfaces, in which the wires, most often coil-shaped, they are built in horizontal partitions or internal walls.

A list of the most common surface temperatures of heating partitions and the amounts of heat obtained from them (ti = + 20 ° C)

Due to the possibility of thermal stresses in the partitions, steam or high-temperature water is not used. Due to the requirements of thermal comfort, a significant limitation is the surface temperature of the partitions constituting heating elements.