Compressor Fade Calculator

Calculate compressor Free Air Delivery (FAD) by inputting displacement, RPM, volumetric efficiency, and pressure.

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Worked Example & Common Values

Below is a sample worked calculation demonstrating how Compressor Fade Calculator processes input data instantly inside your browser.

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About This Tool

This compressor FAD calculator helps you determine the Free Air Delivery (FAD) of an air compressor, which is the actual volume of air delivered at standard atmospheric conditions. By inputting key parameters like compressor displacement volume, RPM, volumetric efficiency, and operating pressure, you can accurately calculate the FAD in cubic meters per minute (m³/min) or cubic feet per minute (CFM). The tool uses standard formulas for precise calculations and includes validation to ensure all inputs are within reasonable ranges.

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How to Use

Enter the compressor displacement volume in liters or cubic inches
Input the compressor RPM (revolutions per minute)
Set the volumetric efficiency as a percentage (typically 70-95%)
Enter the operating pressure in bar or PSI
Select your preferred units for input and output
Click 'Calculate FAD' to get the Free Air Delivery result
View detailed calculation breakdown in the results section

Frequently Asked Questions

Find Quick Answers

What is Free Air Delivery (FAD) in compressors?

Free Air Delivery (FAD) is the actual volume of air delivered by a compressor at standard atmospheric conditions (typically 1 bar absolute pressure and 20°C temperature), measured in cubic meters per minute (m³/min) or cubic feet per minute (CFM).

What is volumetric efficiency in compressor calculations?

Volumetric efficiency is the ratio of actual air delivered to the theoretical maximum based on displacement volume, expressed as a percentage. It accounts for factors like clearance volume, valve losses, and leakage, typically ranging from 70% to 95% for well-maintained compressors.

What units can I use with this calculator?

You can use metric units (liters for displacement, bar for pressure, m³/min for FAD) or imperial units (cubic inches for displacement, PSI for pressure, CFM for FAD). The calculator automatically converts between units as needed.

What is a typical volumetric efficiency value?

For reciprocating compressors, volumetric efficiency typically ranges from 70% to 85%. Rotary screw compressors usually have higher volumetric efficiency, often between 85% and 95%. The exact value depends on compressor design, age, and maintenance condition.

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