Calculate Cfm From Psi

CFM Formula:

\[ CFM = \frac{V \times \Delta P \times 60}{t \times 14.7} \]

Cubic Feet per Minute (CFM):

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1. What is CFM Calculation?

CFM (Cubic Feet per Minute) is a measurement of airflow volume. This calculator determines CFM from pressure change (PSI) in a known volume over time, which is important for assessing air compressor performance and ventilation systems.

2. How Does the Calculator Work?

The calculator uses the CFM formula:

\[ CFM = \frac{V \times \Delta P \times 60}{t \times 14.7} \]

Where:

\( V \) — Volume in cubic feet (ft³)
\( \Delta P \) — Pressure change in pounds per square inch (psi)
\( t \) — Time in minutes (min)
14.7 — Standard atmospheric pressure at sea level (psi)
60 — Conversion factor from minutes to seconds

Explanation: The equation converts the pressure change in a known volume over time into a standardized airflow rate measurement.

3. Importance of CFM Calculation

Details: Accurate CFM measurement is crucial for designing and maintaining HVAC systems, assessing compressor performance, and ensuring proper ventilation in industrial and residential settings.

4. Using the Calculator

Tips: Enter volume in cubic feet, pressure change in psi, and time in minutes. All values must be positive numbers. For best results, measure pressure change during actual system operation.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between CFM and SCFM?
A: CFM measures actual airflow, while SCFM (Standard CFM) is corrected to standard temperature and pressure conditions for comparison.

Q2: How accurate is this calculation method?
A: It provides a good estimate but may vary from actual performance due to temperature changes, system leaks, and measurement inaccuracies.

Q3: What's a typical CFM range for air compressors?
A: Small compressors might deliver 1-5 CFM, while industrial units can provide 100+ CFM at higher pressures.

Q4: Can I use this for liquid flow calculations?
A: No, this formula is specifically for gas (air) flow. Liquid flow calculations use different principles.

Q5: Why is 14.7 psi used in the formula?
A: This represents standard atmospheric pressure at sea level, used as a reference point for pressure calculations.