Cfm To Btu Calculator

BTU/h = CFM × 1.085 × ΔT

\[ BTU/h = CFM \times 1.085 \times \Delta T \]

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1. What is CFM to BTU Conversion?

The CFM to BTU conversion calculates the heat transfer rate in British Thermal Units per hour (BTU/h) based on airflow in cubic feet per minute (CFM) and temperature difference in Fahrenheit degrees (ΔT). This is essential for HVAC system design and analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ BTU/h = CFM \times 1.085 \times \Delta T \]

Where:

\( CFM \) — Airflow in cubic feet per minute
\( \Delta T \) — Temperature difference in Fahrenheit degrees
\( 1.085 \) — Conversion factor (accounts for air density and specific heat)

Explanation: The formula converts airflow and temperature difference into heat transfer rate, where 1.085 represents the product of air density (0.075 lb/ft³) and specific heat (0.24 BTU/lb·°F) multiplied by 60 minutes.

3. Importance of Airflow to Heat Transfer Calculation

Details: This calculation is crucial for HVAC system sizing, heat load calculations, ductwork design, and energy efficiency analysis in heating and cooling applications.

4. Using the Calculator

Tips: Enter CFM value (must be positive) and temperature difference in °F. The calculator will compute the heat transfer rate in BTU/h.

5. Frequently Asked Questions (FAQ)

Q1: What does the 1.085 factor represent?
A: The factor 1.085 combines air density (0.075 lb/ft³), specific heat of air (0.24 BTU/lb·°F), and time conversion (60 minutes/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 the rate of heat transfer regardless of direction.

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

Q4: How accurate is this calculation?
A: This provides a good estimate for standard air conditions. For precise calculations at different altitudes or humidity levels, additional corrections may be needed.

Q5: What is the relationship between CFM and BTU/h?
A: BTU/h increases linearly with both CFM and temperature difference. Doubling either CFM or ΔT will double the heat transfer rate.