Sensible Heat Airflow Calculator
CFM needed for a sensible heat load.
Enter your values
ⓘ Live results
Results
- Required airflow
- 1,111 CFM
- In m³/h
- 1,888
- Load in kW
- 7.03
- Airflow per 1000 BTU
- 46.3 CFM
Working
- 124,000 / (1.08 x 20) = 1,111 CFM
Quick answer
The sensible heat equation says BTU/h equals 1.08 times CFM times temperature difference at standard air.
CFM = BTU/h / (1.08 x ΔT)
How to use the Sensible Heat Airflow Calculator
- 1Enter the sensible portion of the load in BTU/h.
- 2Choose the temperature rise or drop across the coil, typically 18-22°F.
- 3Size the blower and duct for the resulting CFM.
Worked example
Using the values the calculator loads with:
Inputs
- Sensible load24000 BTU/h
- Temperature difference20 °F
Results
- Required airflow1,111 CFM
- In m³/h1,888
- Load in kW7.03
- Airflow per 1000 BTU46.3 CFM
- 24,000 / (1.08 x 20) = 1,111 CFM
Frequently asked questions
Where does 1.08 come from?
It bundles air density, specific heat and 60 minutes per hour at standard conditions.
Metric version?
kW = 1.21 x L/s x ΔT in °C, divided by 1000.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.