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
7.5 Pictographs
Description
Pictographs
Instruction book
158 2920 7109 60
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