Denco have completed a number of energy recovery projects by reclaiming waste heat from air compressors to reutilise in heat sinks found in all industries. This particular energy recover system consisted of energy recovery from a variable speed driven water cooled compressor via a heat exchanger on the compressor cooling circuit. The compressor cooling circuit operates at circa. 85°C and can produce hot water and up to 80% of the compressors total capacity.
This particular operation utilises the hot water produced on a separate closed circuit water system to increase air temperature in a process heating duct. By removing a suction of the ductwork a hot water coil was fitted into the ductwork which allowed the transfer of heat from the compressor cooling circuit through the water circuit and into the supply air. This process reduced the use of gas burners for heating the air.
The installation of this equipment saved the user circa £10K per annum with an equipment payback of only 2 years.