Water quality of evaporative cooling air conditioning and applicability of treatment methods

Abstract

In order to improve the unit scaling and core corrosion caused by circulating water quality in the practical application of evaporative cooling air conditioning, water quality of three different evaporative cooling air conditioning units, including direct evaporative cooling open-cycle cooling water system, indirect evaporative cooling open-cycle cooling water system, and indirect-direct evaporative cooling closed-cycle cooling water system was tested and analyzed. The scaling and corrosion trends of each unit were obtained, and targeted water treatment methods were provided accordingly. It was found that the evaporative cooling air conditioning units with direct evaporative cooling open-cycle cooling water systems have already experienced scaling problems, accompanied by a relatively low occurrence of bacterial and algal growth. It is recommended to use chemical dosing or electrochemical water treatment methods for water quality treatment. The evaporative cooling air conditioning units with indirect evaporative cooling open-cycle cooling water systems have a clear scaling trend, and it is suggested to choose the high-frequency electromagnetic field method, high-voltage electrostatic field method, or a combination of both with chemical dosing method for water quality treatment. The evaporative cooling air conditioning units with indirect-direct evaporative cooling closed-cycle cooling water systems have the most obvious scaling trend and a high possibility of scaling under corrosion. It is recommended to use the high-frequency electromagnetic field method in combination with chemical dosing method or the high-voltage electrostatic field method in combination with chemical dosing method for water quality treatment.

Keywords

• evaporative cooling
• scaling
• corrosion
• indicators of water quality
• electrochemistry
• water treatment methods