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22.1.4 Specifications
22.1.4.1 Specifications of fresh water was heat transfer medium in brazed heat
exchanger
Parameter
Quality Limits for Tap Water on the Secondary Side
Temperature
Below 60°C
pH
7 to 9
Alkalinity
60mg/l < HCO
₃
< 300mg/l
Conductivity
< 500μS/cm
Hardness
[Ca
⁺
, Mg
⁺
] / [HCO
₃⁻
] > 0.5
Chloride
< 200mg/l at 60°C
Sulphate
[SO
₄
²
⁻
] < 100mg/l and [HCO
₃⁻
] / [SO
₄
²
⁻
] > 1
Nitrate
NO
₃
< 100mg/l
Chlorine
< 0.5mg/l
22.1.4.2 External
filter
Solids in the water must be filtered.
Minimum filter mesh size required for the field supply external filter in the water inlet is 20 mesh.