Karanîna Elektrîk: Eya Yekê? (Cûrên Karanînê Elektrîk)

Electric Heating Yehî û Cihê

Electric heating li ser îhtiyacên endustriyeyê û evî de nehat dîtina. Li endustriyan, electric heating bi kar hatin da ku metallan binekînin, şîşên form bikin, miskînên mesûlînê çalak bikin, insulatordan piş bikin û vegera. Li evî, electric heating bi kar hatin da ku xwarin, dew binekînin, oda binekînin di dema zimistan de, lînan veqet bike û vegera.

Hemî wan îhtiyacên binekînin ji ala electricity têne dest pêkirin. Electric heating yew dujmekeşî heye.

1. Electric heating ji her tiştên bisûr hatra, nakev kirina wergera hate biçû.

2. Electric heating ji gazên flue ra hatra, nakev sisteman êndazeya jêrîn.

3. Kontrola derexesê bi kolîya hêsan dikare bikin.

4. Sistemek electric heating an baxtir dibate ser sistemên binekînên dinastîkên din e. Heta costek sazkirina û costek bixebitandina hemî nêzîk in.

5. Parastina otomatîk li ser pirsgirtina her cîhekî li ser sistem binekînê elektrik bi kolîya hêsan dikare têne saz kirin.

6. Efasyivîyetê ya sistemê bi sitemên binekînên dinastîkên din dibate girîng.

7. Sistemek electric heating ji sese ra hatra.

8. Dest pêkirina sistemê bi kolîya hêsan dibate ser sistemên binekînên din.

Tîpanên Electric Heating

Power Frequency Heating

Li nav methodan, elektrik power bekar hatin da ku her substance binekînin. Power frequency heating wekî du kategoriya dabe.

Resistance Heating

Arc Heating

Resistance Heating bekar hatin da ku direct resistance heating, indirect resistance heating.

Direct Resistance Heating

Li direct resistance heating, current directly flows through the substance to be heated. The substance which to be heated in an electric heating system is called charge. As here the charge itself provides the path for passing current and heat gets produced in the charge itself, the efficiency of the system is quite high. The popular examples of direct resistance heating are resistance welding and electrode boiler.

Indirect Resistance Heating

Li nav method, electrical current passes through a resistive element where heat is produced due to ohmic loss. This heat is then transferred to the substance which to be heated. The popular examples of indirect resistance electric heating are immersion water heater, electrical cooking heater ovens and heat treatment systems of metals etc.

Arc Heating

Temperatures very high can be obtained from the arc. Arc can be formed either between two electrodes of sufficient potential difference or between one electrode and the charge itself. In the second case, the charge itself behaves like the other electrode.

Indirect Arc Heating

In the electric furnace where the arc is produced between two electrodes and the heat generated in the arc is transferred to the charge is known as the indirect-arc furnace.

Direct Arc Heating

In the electric furnace where the arc is produced between the electrode and the charge itself is called a direct arc furnace.

High Frequency Heating

This type of electric heating can be categorised as

• Induction Heating

• Dielectric Heating

• Infrared Heating

Induction Heating

Induction Heating is of two types

• Direct Induction Heating

• Indirect Induction Heating

Direct Induction Heating

In the direct induction heating, the current gets induced in the charge itself due to changing current nearby. Due to the inherent resistance of the charge, there is heat produced in the charge itself. Induction furnace and eddy current heater are two well-known examples of direct induction electric heating.

Indirect Induction Heating

In this method, heating elements of the furnace are heated up by the current induced in them by mutual induction of source coil. This heat then gets transferred to the charge by radiation and convection. The indirect induction ovens are mainly used for melting of metals.

Dielectric Heating

This is very difficult to uniformly heat up an installation material like wood, ceramic and plastic etc. Here high frequency dielectric capacitive heating is employed. Dielectric material connected between two electrodes behaves as a capacitor, and high-frequency current can pass through the capacitor. The current through the capacitor causes uniform heating in the dielectric material. The frequency applied in dielectric heating is very high in the range of 10 to 50 kHz, but the efficiency of this system is low about 50%.

Infrared Heating