Variable Speed Air Compressors for Improved Energy Efficiency

What is a Variable Speed Compressor?

An variable speedair air compressor automatically adjusts the compressor's operating speed to match production of compressed air to demand in real time.

Energy efficiency is a crucial concern for all businesses. The more efficient your air system, the lower your energy consumption and, consequently, your energy bill.

A significant portion of energy loss in a factory or plant is due to inefficiencies in air compressor installations. This energy waste can substantially increase energy costs, raising your bills and elevating the cost of ownership. To address this issue, various technologies have been developed to optimize the performance of compressed air systems. One such technology is variable speed drives (VSD).

What is VSD?

Variable speed drive (VSD), also known as variable frequency drive or regulated speed, refers to compressors that use an intelligent drive system to continuously adjust the motor speed to match the air demand. This drive controls the speed (RPM) of the unit based on demand, ensuring the power usage aligns precisely with the required output. When demand decreases, the compressed air system reduces the motor speed, resulting in lower power consumption.

Benefits of a Variable Speed Compressor

No need to unload - the ability to start and stop under full system pressure.

Reduced power costs - no loss of energy through running unloaded.

Reduced power surges - avoid peak currents from starting air compressor motor.

More energy efficient - save 30% of the energy used by a typical fixed speed compressor.

Precise electrical control - motor speeds can be slowed down, brought to a halt or revved up.

System leaks minimised - lower system pressure reduces the risk of leaks.

Fixed vs. Variable Speed Drive Compressors

Traditional air compressors operate at a fixed speed, running at a constant rate and producing a consistent amount of compressed air per minute. This is beneficial if your compressed air demand is constant and unchanging. However, this is often not the case. Fixed-speed compressors always operate at full capacity, so if the full output is not required, energy is wasted.

Additionally, fixed-speed compressors run unloaded to avoid the strain of frequent start-ups on the motor. This can also waste energy since the machine is running without producing any compressed air. Variable speed drive (VSD) compressors address these issues by adjusting the output to match the demand. By producing only the exact amount of air needed by the downstream equipment, VSD compressors significantly improve plant efficiency and reduce energy consumption.

Could I Benefit from a Variable Speed Drive Compressor?

Variable speed drive (VSD) compressors offer significant efficiency benefits for many air compressor installations. Industries such as food and beverage, automotive, medical, and manufacturing often experience fluctuating demands for compressed air.

Integrating a mix of variable and fixed-speed compressors is often the most cost-effective solution. This combination allows for optimal energy savings and ensures that varying air demands are effectively met. By leveraging the strengths of both types, you can achieve greater efficiency and performance in your compressed air system.