Heating is required for domestic purposes such as cooking and heating of buildings, as well as for industrial purposes such as melting of metals, hardening and tempering, case- hardening, drying and welding. Practically all the heating requirements can be met by some form of electric heating equipment. Modes of Heat Transfer: A heated substance will give off heat to another [...]
Resistance heating is based upon the I2R effect. This method of heating has wide applications such as heat treatment of metals (annealing, hardening etc.), drying and baking of potteries, stoving of enameled ware and commercial and domestic cooking. Temperature up to about 1,000°C can be obtained in ovens employing wire resistances for heating elements. Methods of Resistance Heating: There are [...]
The articles to be heated are placed within a high frequency current carrying coil, alternating magnetic field is set up, eddy currents are induced in the article and heating is, therefore, affected (Fig. 5.16). The high frequency current carrying coil is known as heater coil or work coil, the material which is to be heated is known as the charge [...]
In this article we will discuss about:- 1. Meaning of Dielectric Heating 2. Advantages of Dielectric Heating 3. Applications. Meaning of Dielectric Heating: When non-metallic parts such as wood, plastics, bones are subjected to an alternating electrostatic field dielectric loss occurs. In dielectric heating use of these losses is made. The material to be heated is placed as a slab [...]