2.7 Energy recovery
General
The system recovers the major part of the compression heat. The percentage of shaft input power available
for recovery is between 80 and 95, depending on the operating conditions.
If an MD dryer is installed downstream of the compressor, this percentage is reduced to approx. 70 of the
shaft input instead of approx. 90, as part of the heat in the compressed air is used for regeneration in the
drying process.
A complete energy recovery system includes:
• Compressor with modified cooling system (ZR)
• A pump unit (PU) to transfer the recovered energy from the compressor cooling system to the heat
consumer (HC)
• The heat consumer (HC), i.e. the equipment to transfer the energy to the industrial process
Modified cooling water system
The compressor cooling system has been modified to achieve both high cooling water temperatures and
sufficient cooling for the compressor.
The cooling water enters the oil cooler and then flows through the high-pressure compressor element, the
low-pressure compressor element and finally the intercooler and the aftercooler. This sequence ensures
optimal temperature differences with relation to the heat transfer in the individual components.
On Full-Feature compressors, additional connections are provided for the water circuit of the additional
aftercooler and the cooler of the IMD dryer. To ensure that the IMD dryer works properly, low-temperature
cooling water should be used for this cooling water circuit. The heat of this cooling water circuit is not
recovered by the energy recovery system.
Instruction book
36 2920 1815 04
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