Btu To Cfm Conversion Calculator

BTU to CFM Formula:

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

CFM:

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1. What is BTU to CFM Conversion?

BTU to CFM conversion is used in HVAC (Heating, Ventilation, and Air Conditioning) systems to determine the required airflow (CFM) based on the heating or cooling capacity (BTU/h) and temperature difference. This calculation helps in proper system sizing and design.

2. How Does the Calculator Work?

The calculator uses the standard HVAC formula:

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

Where:

\( CFM \) — Cubic Feet per Minute (airflow)
\( BTU/h \) — British Thermal Units per hour (heating/cooling capacity)
\( \Delta T \) — Temperature difference in degrees Fahrenheit
\( 1.08 \) — Constant factor for air at standard conditions

Explanation: The constant 1.08 is derived from the specific heat of air (0.24 BTU/lb·°F), air density (0.075 lb/ft³), and time conversion (60 minutes/hour).

3. Importance of BTU to CFM Conversion

Details: Accurate BTU to CFM conversion is essential for proper HVAC system design, ensuring adequate airflow for heating and cooling loads, energy efficiency, and occupant comfort.

4. Using the Calculator

Tips: Enter BTU/h value (heating or cooling capacity) and temperature difference in °F. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the 1.08 constant in the formula?
A: The 1.08 constant accounts for the specific heat of air (0.24 BTU/lb·°F), standard air density (0.075 lb/ft³), and time conversion (60 min/hour).

Q2: When is this conversion used?
A: Primarily used in HVAC system design for sizing ductwork, selecting fans, and determining airflow requirements for heating and cooling systems.

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

Q4: Does this work for both heating and cooling?
A: Yes, the formula works for both heating and cooling applications, though temperature difference interpretation may vary.

Q5: What if I have metric units?
A: For metric units (kW and °C), different conversion factors apply. This calculator is specifically for imperial units (BTU/h and °F).