Appendix; Quality Requirements On The Water Used In Cooltherm - Knurr CoolTherm Bedienungsanleitung

CoolTherm
Manual / Bedienungsanleitung
10.

Appendix

10.1 Quality requirements on the water used in CoolTherm

To ensure the maximum service life of air-water heat exchangers, chilled water must comply with
the VGB chilled water regulations (VGB-R 455 P). Chilled water used must be soft enough to
prevent deposits, but must not be so soft that heat exchanger corrosion occurs.
The following table contains the most important impurities and methods for removing them:
Water impurity
Mechanical pre-treatment (dp < 1 mm)
Excessive hardness
Moderate content of mechanical impurities and hardness formers
Moderate content of chemical impurities
Biological impurities (bacteria and algae)
It is recommended to achieve the following hydrological data as far as possible:
Hydrological data
pH values
Carbonate hardness
Free carbon dioxide
Bound carbon dioxide
Aggressive carbon dioxide
Sulphides
Oxygen
Chloride ions
Sulphate ions
Nitrates and nitrides
CSB
Ammonia
Iron
Manganese
Conductivity
Solid evaporation residue
Potassium permanganate consumption
Suspended matter
(Partial flow cleaning is recommended)
(Continuous cleaning)
CoolTherm
>7
>3 <8
8 - 15
8 - 15
0
< 10
< 50
< 250
< 10
< 7
< 5
< 5
< 0.2
< 0.2
< 30
< 500
< 25
< 3
> 3 < 15
> 15
01_998_330_0_m
Method of removal
Filtering the water
Soften the water using ion exchange
Addition of dispersing agents or stabilising
agents
Addition of passivation agents and
inhibitors
Addition of biocides
°dH
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
μS/cm
mg/dm3
mg/dm3
mg/dm3
mg/dm3
mg/dm3
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