![]() ![]() Improved types of multibranch radiant tubes, designed to recover the heat of the combustion products, are shown schematically in Figure 1. The simplest is a vertically or horizontally positioned straight tube with a burner mounted at one end and an outlet for combustion products at the other. ![]() Radiant tubes are classified according to their construction. The diameter of the tube varies from 60 to 200 mm, and the length of each branch may be up to 2.5 m. Tubes made of metal are used for heating articles up to 950☌ those made of corundum are used for treatment up to 1200☌. Radiant tubes are installed in furnaces used for the heat treatment of metal articles that must not come into contact with the combustion products of fuels (heating in controlled atmospheres or in air). Heat is transmitted by radiation from the outer surface of the heated tube to the articles being heated. Solar radiation, often called the solar resource or just sunlight, is a general term for the electromagnetic radiation emitted by the sun.Solar radiation can be captured and turned into useful forms of energy, such as heat and electricity, using a variety of technologies. A heater consisting of a tube made of either high-temperature steel or corundum, in which a gaseous (or sometimes liquid) fuel is fired. ![]()
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