Cfm To Btu/h Calculator

BTU/h Formula:

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

BTU/h (BTU per Hour):

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1. What is the BTU/h Formula?

The BTU/h formula calculates heat transfer from airflow, where BTU/h represents British Thermal Units per hour, CFM is cubic feet per minute of airflow, and ΔT is the temperature difference in Fahrenheit degrees.

2. How Does the Calculator Work?

The calculator uses the BTU/h formula:

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

Where:

\( BTU/h \) — British Thermal Units per hour
\( CFM \) — Cubic Feet per Minute (ft³/min)
\( \Delta T \) — Temperature Difference (°F)
\( 1.08 \) — Conversion constant

Explanation: The constant 1.08 accounts for the specific heat of air (0.24 BTU/lb·°F) and air density (0.075 lb/ft³) at standard conditions.

3. Importance of BTU/h Calculation

Details: Accurate BTU/h calculation is essential for HVAC system design, heating load calculations, ventilation system sizing, and energy efficiency analysis in residential and commercial buildings.

4. Using the Calculator

Tips: Enter CFM value in cubic feet per minute and temperature difference in Fahrenheit degrees. Both values must be valid (CFM > 0).

5. Frequently Asked Questions (FAQ)

Q1: What does the constant 1.08 represent?
A: The constant 1.08 combines the specific heat of air (0.24 BTU/lb·°F) and standard air density (0.075 lb/ft³): 0.24 × 0.075 × 60 minutes = 1.08.

Q2: When is this formula typically used?
A: This formula is commonly used in HVAC applications for calculating heating and cooling loads, sizing equipment, and determining heat transfer in air handling systems.

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

Q4: Does this formula work for cooling calculations?
A: Yes, the same formula applies for both heating and cooling calculations, with ΔT representing the temperature difference between supply and return air.

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