1. What is BTU/h Calculation?

The BTU/h (British Thermal Units per hour) calculation from CFM and temperature difference is used in HVAC systems to determine the heating or cooling capacity required for a space based on air flow and temperature change.

2. How Does the Calculator Work?

The calculator uses the BTU/h formula:

Where:

• \( CFM \) — Cubic Feet per Minute (air flow rate)
• \( 1.08 \) — Constant factor (accounts for air density and specific heat)
• \( \Delta T \) — Temperature difference in °F

Explanation: This formula calculates the heat transfer rate based on air volume flow and the temperature difference between incoming and outgoing air.

3. Importance of BTU Calculation

Details: Accurate BTU calculation is essential for proper HVAC system sizing, energy efficiency optimization, and ensuring comfortable indoor climate control in residential and commercial buildings.

4. Using the Calculator

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

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) at standard conditions.

Q2: Can this formula be used for both heating and cooling?
A: Yes, the formula works for both heating (when ΔT is positive) and cooling (when ΔT is negative) applications.

Q3: What are typical CFM values for residential systems?
A: Typical residential HVAC 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 conditions. For precise calculations, factors like altitude, humidity, and air density variations should be considered.

Q5: What is the relationship between BTU/h and tons of cooling?
A: 1 ton of cooling = 12,000 BTU/h. This conversion is commonly used in air conditioning system specifications.