Energy Recovery - Atlas Copco ZR-55 Instruction Book

Instruction book
Cooling system, ZR compressors
The cooling system has two circuits:
• One for the oil cooler (Co) and the cooling jackets of both compressor elements (Eh and El).
• One for intercooler (Ci) and aftercooler (Ca).
Full-Feature compressors have an extra cooling circuit for the regeneration cooler of the integrated dryer.
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.
Full-Feature compressors have an aditional regeneration air cooler (11); the cooling air for this cooler is
generated by an extra fan (13).
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
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