ACFM Calculator
The ACFM (Actual Cubic Feet per Minute) Calculator is a valuable tool used to determine the actual volumetric flow rate of gas under specific conditions. It computes the actual flow rate based on inputs such as Standard Cubic Feet per Minute (SCFM), gas temperature, and gas pressure. Understanding this calculator involves comprehending the formula used for the calculation:
Formula
The ACFM calculation formula is derived as follows:
ACFM = (SCFM * (460 + gas temperature in Rankine)) / (530.67 * (gas pressure in psia))
In this formula:
- ACFM represents the Actual Cubic Feet per Minute, denoting the true flow rate of gas.
- SCFM refers to the Standard Cubic Feet per Minute, the flow rate of gas under standard conditions.
- Gas temperature should be in Rankine (°R), calculated by adding 460 to the temperature in Fahrenheit (°F).
- Gas pressure should be in pounds per square inch absolute (psia).
Table of Common Terms
| Term | Definition |
|---|---|
| Standard Cubic Feet (SCF) | The amount of gas at standard conditions (usually 60°F and 14.7 psia) per minute. |
| Rankine (°R) | A temperature scale starting from absolute zero, where 0°F is equivalent to 460 °R. |
| PSIA | Pounds per Square Inch Absolute, measuring pressure relative to absolute vacuum. |
Example of ACFM Calculator
Suppose we have an SCFM of 100, a gas temperature of 70°F, and a gas pressure of 15 psia. Applying the ACFM formula:
ACFM = (100 * (460 + 70)) / (530.67 * 15)
ACFM ≈ 96.18 ft³/min
Most Common FAQs
ACFM is crucial in determining the true flow rate of gases, aiding in system efficiency and sizing of equipment like compressors.
Yes, ACFM is sensitive to alterations in temperature and pressure, impacting the actual flow rates.