Cfm To Btu Calculator

BTU/h Formula:

\[ BTU/h = CFM \times 1.08 \times \Delta T \]

BTU/h (BTU per Hour):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the CFM to BTU/h Formula?

The CFM to BTU/h formula calculates the heat transfer rate 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.

2. How Does the Calculator Work?

The calculator uses the standard heat transfer formula:

\[ BTU/h = CFM \times 1.08 \times \Delta T \]

Where:

\( CFM \) — Airflow in cubic feet per minute
\( \Delta T \) — Temperature difference in degrees Fahrenheit
\( 1.08 \) — Conversion constant (accounts for air density and specific heat)

Explanation: The constant 1.08 is derived from the specific heat of air (0.24 BTU/lb·°F) and the density of standard air (0.075 lb/ft³), multiplied by 60 minutes per hour.

3. Importance of BTU/h Calculation

Details: Accurate BTU/h calculation is crucial for proper HVAC system sizing, energy efficiency analysis, and ensuring adequate heating or cooling capacity for spaces.

4. Using the Calculator

Tips: Enter CFM as a positive number and temperature difference in °F. The temperature difference should be the difference between supply and return air temperatures.

5. Frequently Asked Questions (FAQ)

Q1: What does the constant 1.08 represent?
A: The constant 1.08 accounts for the specific heat of air (0.24 BTU/lb·°F) and standard air density (0.075 lb/ft³), multiplied by 60 minutes/hour.

Q2: When is this formula typically used?
A: This formula is commonly used in HVAC applications for calculating heating and cooling loads, duct sizing, and system performance analysis.

Q3: What are typical CFM values for residential systems?
A: Residential systems typically range from 400-2000 CFM depending on the size of the home and system capacity.

Q4: Does this formula work for both heating and cooling?
A: Yes, the formula works for both heating and cooling applications, with ΔT representing the temperature difference in either case.

Q5: What are limitations of this calculation?
A: This assumes standard air conditions and may need adjustment for high altitude, extreme temperatures, or non-standard air densities.