Cfm At Psi Calculator Formula

CFM at PSI Equation:

\[ CFM = 4005 \times A \times \sqrt{\Delta P} \]

Cubic Feet per Minute (CFM):

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1. What is the CFM at PSI Equation?

The CFM (Cubic Feet per Minute) at PSI equation calculates airflow through an orifice based on the area and pressure difference. It's commonly used in HVAC, pneumatic systems, and airflow measurement applications.

2. How Does the Calculator Work?

The calculator uses the CFM at PSI equation:

\[ CFM = 4005 \times A \times \sqrt{\Delta P} \]

Where:

\( CFM \) — Cubic Feet per Minute (airflow rate)
\( A \) — Area of the orifice (square feet)
\( \Delta P \) — Pressure difference across the orifice (PSI)
4005 — Conversion factor for standard air conditions

Explanation: The equation shows that airflow is directly proportional to the area and the square root of the pressure difference.

3. Importance of CFM Calculation

Details: Accurate CFM calculation is essential for designing ventilation systems, sizing ducts, selecting fans, and ensuring proper airflow in industrial processes.

4. Using the Calculator

Tips: Enter the orifice area in square feet and the pressure difference in PSI. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What conditions does this formula assume?
A: The formula assumes standard air conditions (68°F, 36% relative humidity at sea level).

Q2: How accurate is this calculation?
A: It provides a good estimate for most applications, but actual results may vary based on temperature, humidity, and orifice shape.

Q3: Can I use this for liquids?
A: No, this formula is specifically for air. Different equations apply to liquid flow.

Q4: What if my pressure is in inches of water?
A: Convert inches of water to PSI (1 inch H2O = 0.0361 PSI) before using the calculator.

Q5: Does orifice shape affect the calculation?
A: The basic formula assumes a sharp-edged orifice. Different coefficients may be needed for other shapes.