Specific energy measures how much electricity a compressor uses to produce each cubic metre of air. It is the fairest way to compare machines of different sizes and technologies.
What It Means
- Specific energy = input power divided by free air delivery.
- Expressed in kW per m³/min.
- Lower specific energy means a more efficient machine.
Why It Matters
- It lets you compare efficiency across brands and sizes.
- A small difference in specific energy costs a lot over 10 years.
- Grade-1 machines have the lowest specific energy.
How to Use It
- Ask suppliers for specific energy at your working pressure.
- Compare under the same pressure and conditions.
What is good specific energy?
It depends on pressure and technology, but Grade-1 screw compressors typically achieve around 6–7 kW per m³/min at 7–8 bar.
Talk to an Engineer
Contact Panrui with your flow, pressure and air quality requirements to get a recommendation and factory quote for your project.