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11.0 CALCULATIONS
11.1 CALCULATING TEMPERATURE RISE
• The formula for calculating air temperature rise for electric resistance heat is:
3.16 x Watts
Temperature Rise °F =
CFM
Where: 3.16 = Constant, CFM = Airflow
11.2 CALCULATING BTUH HEATING CAPACITY
• The formula for calculating BTUH heating capacity for electric resistance heat is:
BTUH Heating = Watts x 3.412
Where: 1 kW = 1000 Watts, 3.412 = Btuh/Watt
11.3 CALCULATING AIRFLOW CFM
• The formula for calculating airflow using temperature rise and heating BTUH for units
with electric resistance heat is:
Heating BTUH
CFM =
1.08 x Temp. Rise
11.4 CALCULATING CORRECTION FACTOR
• For correction of electric heat output (kW or BTUH) or temperature rise at voltages
other than rated voltage multiply by the following correction factor:
Applied Voltage
2
Correction Factor =
Rated Voltage
2
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