Good practices: Simplified water treatment for cooling towers
Data centers produce a lot of heat which needs cooling. One of the most energy efficient way for cooling is the use of wet cooling towers, which use the evaporation of water for cooling purposes. Usually chemicals are used to condition the water: prevent scale formation by adding Anti Scaling agent, and prevent bio growth in the cooling water by adding biocides. Negatives of this solution is that it needs a lot of chemicals and has a low water efficiency.
Chemical free cooling systems
Water in Israel is much scarcer, resulting in a much higher price and projects having to manage their water intake properly. A technology was developed by a company in Israel to reduce the water intake and discharge for cooling towers severely. This company started in 1993 and has more than 4000 references around the globe meanwhile. The focus areas were water scarce countries, Western Europe not being a target area. In 2016 the first contacts were made to establish representation of this technology by Aqua Innovation Network B.V.
The technology uses an electrical field to form a scale in its reactors. This prevents scaling in all the rest of the cooling system. Also, some chlorine is produced from the chloride ions in the water, resulting in a total disinfection of the system. Periodically the water quality is checked, the scale removed from the reactors and the systems key parameter (amperage) is changed to the optimal setting for the current situation. The client can control the current through the system, and knows that if the current is there, both scale prevention and disinfection take place.
The result is a chemical free cooling system, which uses less feed water, and reduces the discharge to an absolute minimum.
Good Practice provided by participants and partners of the Green IT Amsterdam Consortium