Scfm Acfm Icfm

Overview

Engineering reference data for Scfm Acfm Icfm in miscellaneous.

Key Formulas

Unit Conversion

$y = x \cdot k$

Multiply by conversion factor.

Linear Interpolation

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

Percentage

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

Variables

Symbol	Description	Unit
$x$	Input value	—
$y$	Output value	—
$k$	Conversion factor	—

Standard Conditions for SCFM

Standard Cubic Feet per Minute (SCFM) is measured against fixed reference conditions. While definitions can vary, the most common standard in the United States is:

• Pressure: 14.696 psia
• Temperature: 60°F (520°R)
• Relative Humidity: 0%

Other standards, like the one from ISO, use 14.5 psia (1 bar) at 68°F (20°C).

Air Volume Conversion Factors Table

The following table provides factors to adjust air volume based on temperature, referenced to air at 70°F (21.1°C).

Important Variables for Actual Air Flow

The conversion from standard to actual air volume (SCFM to ACFM) is not constant because real-world conditions vary. The key factors are:

• Actual Pressure (Pact): The ambient atmospheric pressure at the installation site, which decreases with elevation.
• Actual Temperature (Tact): The ambient air temperature.
• Actual Relative Humidity (Φ): The moisture content of the air.
• Saturation Pressure (Psat): The pressure exerted by water vapor in the air at the actual temperature.

Interactive Charts

References

• Original Source