9 TPH material is heated in a oil fired furnace. The temperature of material is increased by 1300°C. Oil used per hour is 700 litres, specific gravity oil is 0.95 and its net calorific value is 9500 kcal/kg. Find thermal efficiency of the furnace if specific heat of material is 0.12 kcal/kg °C.

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Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.