The graph can be read to determine expected temperature rise.
Electrical enclosure heater calculator.
This calculator has a maximum temperature rise of 140 f or 78 c step 1.
To use this calculator appropriately one must first quantify the amount of heat generated by components inside.
Choose from a wide range of capacities power inputs mounting options sizes and type ratings.
You can use this calculator to find the wattage you need.
Once total heat is calculated the calculator can be used to determine expected temperature rise based on the control panel size and type of enclosure.
Determine the heat generated inside the enclosure.
For example if you know the power generated inside the unit assume 10 of the energy is dissipated as heat.
Approximations may be necessary.
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Find your enclosure s total surface area by entering its dimensions here.
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The wattage of the heater you need is determined by the total surface area of your enclosure and the temperature rise you need to produce.
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For heat transfer from the outside calculate the area exposed to the atmosphere except for the top of the control panel.