Selection Guide for choosing the right Pressure-rated flanged Immersion heater for Your Application
1 - Determine a Safe and Efficient Element Watt Density
Element Watt Density is the wattage dissipated per square inch of the element sheath surface and is calculated with the following formula:
|Watt Density =||element wattage|
|π × element dia. × element heated length|
For a particular application, element watt density will govern element sheath temperature. Factors to consider when choosing a suitable watt density are:
- Many materials are heat sensitive and can decompose or be damaged if the element is running too hot.
- Air and other gases that are poor conductors of heat require watt densities matched to the velocity of the gas flow to prevent element overheating
- When heating hard water and cleaning solutions mineral deposits can build up on the element sheath, acting as a heat insulator and raising the internal element temperature. If these deposits cannot be periodically removed, use a lower watt density element to increase heater life expectancy.