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Description: Introduction to water quality standards for central air conditioning cooling, central air conditioning cooling water quality analysis of the problems and causes, comparing several advantages and disadvantages of cooling water treatment technology and applications.

　　Cycle cooling water system water treatment has been of debate and discussion of the issues. The current domestic situation: ① No treatment or simply to take the sewage to control scaling or corrosion. ② to add water to control cooling water softening. ③ Additional static water cooling water system processor scaling, cleaning, disinfection and algae. ④ In the cooling water system of pharmaceutical dosage (scale, corrosion, disinfection, algae) to control scale, corrosion and microbial reproduction. According to statistics, as a result of the cooling water cooling system failure or downtime is not uncommon for performance degradation. Study abroad has long been found], central air conditioning cooling water contains a lot of Legionella (Legionnaire'sDisease), and easy to spray water droplets spread through the air the way, harm can not be ignored. In addition, wide span North and South China region, the South, the North is not the same quality, it is necessary for different geographical environments with different water treatment methods, to find a more suitable and more economical cooling water treatment and control programs. I was against this background, the cooling water system treatment technology compared and discussed.

1Cooling water quality standards
 Central air conditioning system by the condenser cooling water system, cooling tower, cooling pump, cooling pipes and filters and other components. Open cooling water system cooling tower water quality standards should be based on the structure, material, condition, fouling thermal resistance, corrosion rate and the formula used in water treatment and other factors identified. To improve the cooling water must be set in the pipeline of effective quality control and processing devices. Open cooling water quality must meet the "design of industrial cooling water treatment"(GB500050) and the norms on water quality requirements [3]. As open cooling water system will occur a certain amount of evaporation and elegant losses, so on a regular basis or automatic replenishment (fill water is generally 1.2% to 1.6%). Cooling Water for water quality requirements, general requirements than the cooling water quality is also high (see Table 1).
 Table 1 Central air conditioning cooling water and supply water quality standard