Instruction book
18 9829 3178 63
After the compression stage, the oil is separated from the compressed air. The compressed air
flows to the aftercooler and the oil flows to the oil cooler. The energy in the oil is recovered by
installing a heat exchanger in front of the oil cooler.
The energy recovery systems can be applied as low temperature rise / high water flow systems
(e.g. central heating in closed water circuits) or as high temperature rise / low water flow systems
(e.g. pre-heating of boiler feed water in open water circuits).
Main components
The system mainly comprises:
• Oil/water heat exchanger (HE)
• Energy recovery valve (Y152)
• Oil by-pass valve (Y151)
• Temperature sensors for water inlet and outlet
• The necessary pipes, brackets, bolts, etc.
Installation
The package includes:
• a general by-pass system, to shut down the energy recovery system
• a by-pass system to prevent the oil outlet temperature from dropping below the minimum
value.
When the Energy Recovery system is working, this by-pass system makes the oil flow
through the Energy Recovery heat exchanger instead of the normal oil cooler
2.5 Energy recovery system
General description
The maximum allowed pressure at the water side of the heat exchanger is 10 bar (145
psi).
The energy required in any compression process and the main motor losses are mainly
transformed into heat. The major part of the transformed heat is dissipated through the oil
system. The Atlas Copco energy recovery systems are designed to recover most of the above-
mentioned heat as warm or hot water without any adverse influence on the compressor
performance.
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