If biology is present, it must be aerobic. Anaerobic biology (in closed systems) must be avoided.
Biology (CFU/ml)
Type of cooling system Standard Energy recovery
Single pass
< 10
5
/ < 10
7
< 10
3
/ < 10
5
Recirculating (with tower)
< 10
5
/ < 10
7
not applicable
Closed loop
< 10
3
/ < 10
5
< 10
3
/ < 10
5
The table shows the recommended values. The values in bold are rejection limits.
If additives are used in the cooling water, take into account that the cooling capacity will
change.
Δm = ((C
pw
- C
pa
) * X) / (C
pw
*(1-X) + X*C
pa
) * 100 %
with
Δm: change of mass flow of the coolant
C
pw
: specific heat capacity of water
C
pa
: specific heat capacity of the additives
X: the percentage of additives
5.1.6 Energy recovery data
Reference conditions
See section Reference conditions and limitations.
Effective working pressure
Consult section Compressor data for the normal working pressure.
Maximum allowed pressure of the heat exchanger
Oil side 15 bar (217 psi)
Water side 10 bar (145 psi)
Reading settings
In addition to other data, the following temperatures can be read on the Elektronikon display:
For air-cooled units:
• The water inlet temperature of the energy recovery system
• The water outlet temperature of the energy recovery system
Modifying settings
If the programmed warning settings for the water temperatures are exceeded, a warning indication is shown
on the Elektronikon:
Instruction book
94 2920 7109 23
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