ABSTRACT
This chapter shows a construction that has been used in front of a cylinder-shaped reflector for space heating by radiation. The element consists of at least two supports of an insulating material between which a ribbon or a wire is suspended. At least one of the supports is elastically fixed to the frame for the element in order to keep the ribbon or wire straight when it elongates as a result of its thermal expansion. The horizontal, slanting, or vertical coil is mechanically suspended between fixed supports, normally of insulating material, and hangs freely between them. The use of a corrugated wire or ribbon makes it easier to keep to rating tolerances, and a low thermal expansion coefficient becomes less important. In accordance with the dominating form of heat dissipation from these elements we can distinguish between three types: elements in which the heat is emitted mainly by forced convection, by free convection, and by radiation.
