Approximately 10% of all electricity used in industry is accounted for by compressed air systems.
It is a thermodynamic fact that around 95% of this energy is converted to heat and is wasted to the atmosphere through heat dissipated by the motor and cooling system, with the majority lost via the oil cooler. By re-directing the hot oil to a high efficiency oil to water heat exchanger, the heat can be transferred to water, raising the temperature to a required level for a multitude of applications.
The heat generated during compression is paid for as part of the process, then paid for again during removal by way of cooling fans. Instead of simply removing the heat, it can be used to generate hot water, heating systems and application processes in other areas of the installation.
CompAir’s innovative heat recovery systems delivers the opportunity to save money, energy and help to protect the environment.
The basic principle lies in the transferral of heat into a medium and then transporting it to where it can be utilised. The hot cooling air of a closed air cooled compressor can be diverted to an enclosed area via ducting for heating.
If water was to be heated, the oil in the oil cooler is chosen as the transfer medium, this will provide approximately 72% of the overall power consumption for water heating.
CompAir is part of Gardner Denver, Inc., a leading global manufacturer of highly-engineered, critical flow-control products, Gardner Denver is headquartered in Milwaukee, Wisconsin, USA and has facilities in more than 30 countries. To learn more about the company, visit