Cfm To Btu Conversion Calculator

CFM to BTU Conversion Formula:

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

Heat Output (BTU/h):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is CFM to BTU Conversion?

The CFM to BTU conversion calculates the heat output in British Thermal Units per hour based on air flow rate 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 HVAC heat calculation formula:

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

Where:

\( BTU/h \) — British Thermal Units per hour (heat output)
\( CFM \) — Cubic Feet per Minute (air flow rate)
\( 1.08 \) — Conversion factor (accounts for air density and specific heat)
\( \Delta T \) — Temperature difference in degrees Fahrenheit

Explanation: The 1.08 factor combines the specific heat of air (0.24 BTU/lb-°F) and the density of air (0.075 lb/ft³) at standard conditions, multiplied by 60 minutes per hour.

3. Importance of HVAC Heat Calculation

Details: Accurate heat calculation is crucial for proper HVAC system sizing, energy efficiency analysis, heating load determination, and equipment selection in residential and commercial applications.

4. Using the Calculator

Tips: Enter CFM (air flow rate) in cubic feet per minute and temperature difference in degrees Fahrenheit. Both values must be valid positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What does the 1.08 factor represent?
A: The 1.08 factor accounts for the specific heat of air (0.24 BTU/lb-°F), air density (0.075 lb/ft³), and converts minutes to hours (60 min/hour).

Q2: When is this calculation used?
A: This calculation is commonly used in HVAC design for determining heating coil capacity, furnace sizing, heat recovery systems, and air heating applications.

Q3: What are typical CFM values?
A: Residential systems typically range from 400-2000 CFM, while commercial systems can range from 2000-50,000+ CFM depending on building size and requirements.

Q4: How accurate is this formula?
A: The formula provides good accuracy for standard air conditions at sea level. For high altitudes or extreme conditions, adjustments may be needed for air density variations.

Q5: Can this be used for cooling calculations?
A: While the principle is similar, cooling calculations typically use different factors that account for latent heat (moisture removal) in addition to sensible heat (temperature change).