the lower limit of the energy recovery (for compressors with working pressure up to 10 bar (150
psi)).
If the air inlet temperature and R.H. are known, tc can be lower than the limits above and can be
calculated from the curves below. The compressor stage outlet temperature should exceed this
value by adapting the thermostatic valve Y151 in the thermostatic valve housing of the oil cooling
system of the standard compressor. To obtain a higher element outlet temperature (with a high
energy recovery water flow and/or low energy recovery water inlet temperature) (to get a higher
water outlet temperature), a thermostatic valve with an indicated temperature higher than the
standard factory mounted has to be mounted in the thermostatic valve housing of the oil cooling
system of the standard compressor. A list of standard thermostat settings for Y151 can be found
below.
The cooling water circuit of the energy recovery is by default protected against steam generation
by a compressor shut down at cooling water temperatures of the energy recovery of 95 °C (203
°F). When the thermostat valve selection is done for a compressor stage outlet temperature
running above 95 °C (203 °F), the compressor might trip at this limit value. This could happen
whenever the heat dissipation in the customer's installation stops (e.g. when the pump in the
customer's installation stops) or the heat dissipation is lower than the heat recovered from the
compressor. This results in a gradual temperature increase on the energy recovery cooling
medium system until the shut-down value has been reached. In this case following measures can
be taken to prevent an unwanted shut down:
•
Manually switch off energy recovery by use of the hand wheel.
• Ask an Atlas Copco technician to increase the shut down value of the cooling water
temperature of the energy recovery in the Elektronikon controller. It is advised to choose a
temperature higher than the selected compressor element outlet temperature but at least 5
°C (9 °F) below the boiling point of the applied cooling medium and never higher than 120
°C (248 °F).
The thermostatic valve of the energy recovery (Y152) always needs to have an
indicated temperature equal to or higher than that of the thermostatic valve in the
thermostatic valve housing of the oil cooling system of the standard compressor.
Instruction book
22 9829 3178 63
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