Instruction book
1904 0504 83
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When the compressor is started up from cold, the oil temperature will be low. Bypass valve (BV2) shuts
off the oil supply from the heat exchanger (HE) and bypass valve (BV1) shuts off the oil supply from the oil
cooler (Co) to prevent the compressor oil from being cooled. The oil flows from the oil separator vessel
(AR) through the oil filter(s) (OF) back to compressor element (E).
All energy input is used to rapidly warm up the compressor oil. No energy is recovered.
Ì
Maximum energy recovery
As soon the oil temperature reaches the set point (opening temperature) of bypass valve (BV2), the
valve starts closing off the bypass over the heat exchanger (HE) oil line, while gradually allowing the oil to
flow through the heat exchanger (HE). As the oil temperature rises to approx. 15 °C above the set
point, all the oil passes through the heat exchanger. The exchange of heat between the compressor
oil and the heat recovery water is maximum. The oil from the heat exchanger outlet flows via oil filter
(OF), oil stop valve(Vs - if present), compressor element (E) and separator (AR) back to the inlet of
heat exchanger (HE). Bypass valve (BV1) bypasses the oil cooler (Co) as long as the oil temperature
remains below its set point.
Operation principle at different loads:
Ì
Low consumption of recovered energy In this case, the temperature of the oil leaving heat
exchanger (HE) would become too high for the oil to be injected into compressor element (E).
Oil cooler bypass valve (BV1) will open the supply line to the compressor oil cooler to allow the
hot oil to be cooled in cooler (Co).The amount of energy supplied to the water is adapted to the
need of energy.
Ì
Recovery water flow too high/temperature too low In this case, bypass valve (BV2) will open
the bypass line of the oil separator vessel, allowing colder oil from heat exchanger (HE) to be
mixed with hot oil from separator (AR). Energy is transferred from the compressor oil to the
water, but at a relatively low temperature level.
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The handle (V1) is completely turned out anti-clockwise.
The oil circuit is the same as without installation of the energy recovery system.
No energy is recovered.
This situation should be considered as exceptional, e.g. in case of maintenance of the energy recovery
system or when no energy is required for a long period.
On fixed speed compressors, run the unit unloaded for a few minutes before isolating the energy
recovery system from the compressor.
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In case of an open water system and/or if freezing temperatures can be expected, isolate the
compressor water system and blow it through with compressed air.
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