The values in
bold
are rejection limits.
9.
Copper
Copper (ppm)
Type of cooling system
Standard
Energy recovery
Single pass
< 1
< 0.2
Recirculating (with tower)
< 1
not applicable
Closed loop
< 1
< 0.2
10.
Ammonium
The limit of
0.5 ppm
is a rejection limit.
The limitation only applies for copper containing systems.
11.
Suspended solids
Large particles (size > 10 µm) should not be present as they can be filtered out.
Small particles (< 0.5 µm) are not taken into account.
For particles between 0.5 µm and 10 µm, the following limits apply:
Suspended solids (ppm)
Type of cooling system
Standard
Energy recovery
Single pass
< 10
< 1
Recirculating (with tower)
< 10
not applicable
Closed loop
< 10
< 1
12.
Oil or grease
<
1 ppm
(rejection value)
13.
Biology
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
Instruction book
74
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