Aleksandr V. Alekseev, Nikolay N. Novitsky

Melentiev energy systems institute SB RAS

The article considers the problem of calculating the quality of water in water supply systems with closed circulation loops. The conducted review of works on modeling water quality in water supply systems showed that there are many factors affecting the water quality in water supply systems. The most widespread in practice is water disinfection with chlorine. Bilateral restrictions are imposed on the concentration of chlorine in water, and operating organizations are obliged to maintain the required concentration of chlorine to the tap of each consumer. In the process of transporting water, the concentration of chlorine decreases due to interaction with the pipe material and dissolved substances. Thus, one of the main indicators of water quality can be its age. Existing models for calculating the water age do not allow calculating the age of water in water supply systems in the presence of closed circulation loops. A topological algorithm for calculating the age of water in networks with closed circulation loops is proposed. The software implementation of the algorithm is integrated into the “ANGARA-VS” information and computing complex and tested on conditional and real examples of water supply systems. The software implementation of the algorithm has shown high computational efficiency and can be applied in practice when analyzing the modes of water supply systems. It is shown that there are only a few ways to manage water quality in water supply systems. A new approach to water quality management based on the creation of closed circulation circuits is proposed. This approach requires minimal capital and operating costs compared to

water supply system, water quality, water age, water chlorination, water quality management, closed loop circulation