Energy costs are a major concern in industrial operations, and air compressors (whether rotary or piston) are no exception. With approximately 10% of an industrial company’s energy consumption dedicated to air compression, finding ways to cut costs is essential.

One of the most effective solutions are heat recovery systems. These systems recycle excess heat generated during compressor operation, turning waste into usable energy.

During operation, air compressors consume energy and generate heat. Indeed, 95% of that heat is typically wasted through dissipation by the motor, cooling system, and oil cooler.

Therefore, heat recovery systems capture this excess heat and repurpose it for other applications, such as heating water or air, making your operations more sustainable and cost-effective.

The principle is quite simple. It involves transferring heat to another medium and transporting it to where it can be used.

For air-cooled compressors, the cooling air can be redirected through ducts to an enclosed area for heating. Both water and air can be used as heat transfer fluids, depending on the design of your system.

Hydronic systems use a heat exchanger connected to the compressor to heat water. Among other things, they can:

• Preheat water in a heating system
• Reheat water in the system
• Heat process water for industrial applications

The key advantage of this system is that up to 80% of the heat from the compressor can be transferred to the water, reaching temperatures as high as 70°C. This makes it a very efficient method of energy recovery.

Air-based systems are economical and ideal for heating or cooling rooms rather than production processes.

In winter, warm air from the compressor is directed to the desired areas, and in summer, cool outside air is circulated and discharged to the outside.

Our expert advice: For dual compressors, each unit must be equipped with its own valve to prevent hot air from entering inactive compressors.

Recovery systems offer several significant advantages for your business. First and foremost is the reduction in energy costs, guaranteed by waste reduction and heat reuse.

These processes also offer a rapid return on investment (particularly with airbone systems), and a certain degree of versatility (heating water or air for multiple applications).

In general, proper maintenance is essential to ensure long-term efficiency. We therefore strongly recommend that you always use qualified professionals. Among other things, they will:

• Ensure safe operation
• Provide advice on how to optimize performance
• Recommend preventive maintenance strategies

Also, be careful with second-hand equipment; invest in quality parts and regular maintenance for better reliability and savings.