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18.1.4 Specifications
18.1.4.1 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 < HCO₃ < 300mg/l
Conductivity < 500μS/cm
Hardness [Ca⁺, Mg⁺] / [HCO₃⁻] > 0.5
Chloride < 200mg/l at 60°C
Sulphate [SO₄²⁻] < 100mg/l and [HCO₃⁻] / [SO₄²⁻] > 1
Nitrate
NO₃ < 100mg/l
Chlorine < 0.5mg/l
18.1.4.2 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.
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