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What are the water quality standards for cooling water? Management items and reference values [Basic knowledge]

pH, electrical conductivity, chloride ions, hardness, silica. This explains the guideline values for cooling water and makeup water in cooling towers, as well as how to measure them monthly.

The cooling water in cooling towers can gradually concentrate salts such as calcium and silicates due to evaporation, which may lead to scaling and corrosion. As water evaporates, the concentration of salts in the remaining water increases. So, how concentrated can it become? ■ How are the guidelines for cooling water determined? The guidelines for cooling water used in air conditioning are based on the "Water Quality Guidelines for Refrigeration and Air Conditioning Equipment" (JRA-GL-02-1994) established by the Japan Refrigeration and Air Conditioning Industry Association. The quality standards for cooling water and make-up water are outlined in this guideline, and in building maintenance operations, water for air conditioning equipment is managed according to these guidelines. ■ How many items are there in total? The guideline lists 15 items that represent typical factors for corrosion and scaling. ■ Standard items and reference items The 15 items are divided into standard items such as pH and electrical conductivity, and reference items such as iron, copper, and residual chlorine. Reference items also include sulfide ions and ammonium ions. In the case of closed cooling towers, the spray water is treated the same as this circulating cooling water. Please feel free to consult us first.