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CFM to BTU/h Formula:
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The CFM to BTU/h conversion calculates the heating value of natural gas flow. This formula converts cubic feet per minute (CFM) of natural gas to British Thermal Units per hour (BTU/h), using an approximate heating value of 1,000 BTU per cubic foot of natural gas.
The calculator uses the simple conversion formula:
Where:
Explanation: This calculation assumes natural gas has an average heating value of approximately 1,000 BTU per cubic foot. Actual heating values may vary slightly depending on gas composition.
Details: Accurate BTU/h calculation is essential for sizing heating equipment, determining fuel consumption rates, calculating heating costs, and ensuring proper system design for HVAC applications and industrial processes.
Tips: Enter the CFM value (cubic feet per minute) of natural gas flow. The value must be greater than zero. The calculator will automatically compute the corresponding BTU/h heating value.
Q1: Why use 1,000 BTU per cubic foot as the conversion factor?
A: This is the standard approximate heating value for natural gas in the United States, though actual values can range from 950 to 1,050 BTU per cubic foot depending on the gas source.
Q2: What is the difference between CFM and BTU/h?
A: CFM measures volumetric flow rate (how much gas is flowing), while BTU/h measures heating capacity (how much heat the gas can produce).
Q3: When is this conversion typically used?
A: This conversion is commonly used in HVAC system design, furnace sizing, boiler calculations, and industrial process heating applications.
Q4: Are there limitations to this calculation?
A: Yes, this assumes standard natural gas composition. For propane, butane, or other gases, different conversion factors apply. Altitude and temperature can also affect accuracy.
Q5: How accurate is the 1,000 BTU/ft³ assumption?
A: It's a good approximation for most applications, but for precise calculations, consult your local gas utility for the exact heating value of your natural gas supply.