Home
Back
BTU/h from CFM Formula:
| From: | To: |
The BTU/h from CFM calculation determines the heating or cooling capacity in British Thermal Units per hour based on airflow in cubic feet per minute and temperature difference. This is essential for HVAC system design and analysis.
The calculator uses the formula:
Where:
Explanation: The formula calculates the heat transfer rate based on airflow and temperature differential, where 1.08 is derived from air density and specific heat constants.
Details: Accurate BTU/h calculation is crucial for proper HVAC system sizing, energy efficiency analysis, and ensuring adequate heating/cooling capacity for spaces.
Tips: Enter CFM value in cubic feet per minute and temperature difference in °F. Both values must be positive numbers for accurate calculation.
Q1: What does the 1.08 constant represent?
A: The 1.08 constant combines air density (0.075 lb/ft³), specific heat of air (0.24 BTU/lb·°F), and minutes to hours conversion (60 min/hour).
Q2: Can this formula be used for both heating and cooling?
A: Yes, the formula works for both heating and cooling applications, as it calculates heat transfer rate based on temperature difference.
Q3: What are typical CFM values for residential systems?
A: Residential HVAC systems typically range from 400-2000 CFM depending on the size of the home and system capacity.
Q4: How accurate is this calculation method?
A: This method provides good estimates for standard air conditions. For precise calculations, factors like altitude and humidity should be considered.
Q5: What is the relationship between BTU/h and tons of cooling?
A: 1 ton of cooling equals 12,000 BTU/h. This calculator helps determine the cooling capacity needed for specific airflow and temperature conditions.