Cooling systems in circulation are the type of systems where cooling water is taken from immediate environment (from the lake, river or other type of watercourse). The water turns its path only once in the cooling process and then it comes back. In the past this was the cheapest way of cooling in locations which were rich in cooling water and this resulted in its relative frequency of usage. In terms of investment such process was quite simple, undemanding and there were no serious problems if the characteristics of water didn?t encourage formation of deposits or sediments in the system.
Today, environmental regulations and taxes are directing us to use close water cooling systems, thus the cooling systems in circulation are rarely built. They can be accepted conditionally if ecological criteria and technical requirements allow performance of such way of water cooling. Although the problem there is the need to prepare the entire circulation of water. When ecological taxes were introduced the economic viability was questionable for such systems, since the operating costs are relatively high especially if pollution of cooling water occurs during the cooling process.
In the cooling cycle some problems occur mainly because of some particles which deposit in installations and devices. And there can be problems with microbiology, deposits, sediments and corrosion as well.
We need to take care for the proper operation of the system by means ofadequate preparation of cooling water.