Alloy Wire South Africa

South Africa Contact Information

Narrowboat Way, Hurst Business Park, Brierley Hill,
West Midlands, DY5 1UF UK

Tel: +44(0) 1384 262022
E-Mail: sales@alloywire.com

Surface Area Loading

Surface Area Loading

It is possible to design an element in a variety of sizes all of which would in theory give the desired wattage load or power density dissipated per unit area. However, it is essential that the load on the surface of the element is not too high as the transfer of heat by conduction, convection or radiation from the element may not be rapid enough to prevent it over-heating and failing prematurely.

The suggested surface loading range for the type of appliance and element are shown below – but this may need to be lower for an element working with more frequent operating cycles, or at nearly its maximum operating temperature, or in harsh atmospheres.

Appliance Element Type Suggested Surface Loading
Range (W/cm2)
Fire Spiral Element in Free Air 4.5 – 6.0
Fire Pencil Bar 6.0 – 9.5
Band Heater Mica-Wound Element 4.0 – 5.5
Toaster Mica-Wound Element 3.0 – 4.0
Convector Spiral Element 3.5 – 4.5
Storage Heater Spiral Element 1.5 – 2.5
Fan Heater Spiral Element 9.0 – 15.0
Oven Element Tubular
Sheathed Element
8.0 – 12.0
Grill Element 15.0 – 20.0
Hotplate 17.0 – 22.0
Water Immersion Heater 25.0 – 35.0
Kettle Element 35.0 – 50.0

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