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Instruction book
Explanation of arrows
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(1)
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(4)
Cooling system, ZT compressors
The compressors are provided with an air-cooled oil cooler (Co), intercooler (Ci), pre-aftercooler (Ca1) and
aftercooler (Ca2). An electric motor-driven fan (FN) generates the cooling air.
2.6
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
APFS998935v00
Name
Air inlet
Air flow
Oil flow
Air outlet
19
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