Electric Duct Heater Pressure Drop

This can result in reduced fan motor horsepower and makes it possible to retrofit open coil heaters into existing systems without changing the fan motor.

Electric duct heater pressure drop.

Open coil duct heaters have listing of 22 5 kw per square foot. 20 000 3333 6 c. Element watt density vs. Duct size equal 2 ft.

Thermolec electric duct heaters are designed for use in all forced air commercial and industrial hvac systems. Electric heater thyrister control panels. However if pressure plates must be added to an open coil the pressure drop over the open coil far exceeds the drop over a. Since an electric duct heater has a constant btu h output as long as the heater is energized a mini mum air velocity must be maintained through the heater.

Low pressure drop because of the high percentage of open space across the heater open coils have very low pressure drop as compared to finned tubular heaters. Low pressure drop because of the high percentage of open space across the heater open coils have very low pressure drop as compared to finned tubular heaters. Sheath temperature and air velocity graph. Stab in electric heaters.

Inches h20 kw ft 2 x velocity in fpm 2 760 500 8. Their applications vary from a partial or auxiliary nature to being the major or principal heat source in a building. When we trap the heat excess humidity and. To properly match a duct heater to an application the wattage air velocity and element watt density must be determined.

The pressure drop across a finned tubular heater is greater than across an open coil. For tubular duct heaters the limitation is usually about 13kw per square foot. Commercial industrial applications commercial industrial retail education residential. Electric heater duct cassette sections.

Same concentration of wattage as an open coil heater. Fresh air heater today s airtight homes and offices beg for fresh air. This can result in reduced fan 2 motor horsepower and makes it possible to retrofit open coil heaters into existing systems without changing the fan motor. Calculating pressure drop through a heater the chart shown below is the approximate pressure drop through a heater based on the velocity of the.

Maximum discharge air. Wattage calculation formulas and table. Proper air flow will prevent over temperature. Static pressure drop through an open coil heater is quite low and in most cases can be ignored when calculating system pressure drop.