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

The CFM to BTU/h formula converts cubic feet per minute airflow to British thermal units per hour for heat transfer calculations. This is essential for HVAC system design and analysis.

2. How Does the Calculator Work?

The calculator uses the BTU/h formula:

Where:

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

Explanation: The formula calculates the heat transfer rate based on airflow volume and temperature difference, using the thermodynamic properties of air.

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

5. Frequently Asked Questions (FAQ)

Q1: What does the 1.08 constant represent?
A: The 1.08 constant accounts for the specific heat of air (0.24 BTU/lb-°F) and air density (0.075 lb/ft³), converted to hourly rate.

Q2: When is this calculation used?
A: This calculation is commonly used in HVAC design for sizing heating and cooling equipment, ductwork design, and energy analysis.

Q3: What are typical CFM values?
A: Typical CFM values range from 100-2000 CFM for residential systems and can be much higher for commercial applications.

Q4: Can this be used for cooling calculations?
A: Yes, the same formula applies for both heating and cooling, with ΔT representing the temperature difference across the system.

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