Khovanskyy S. Effectiveness increase of centrifugal pumps maintenance in water-supply system of housing and communal services.

The dissertation focuses on theoretical and experimental research aimed at improving energy efficiency of exploitation of centrifugal pumps, that work on the hydraulic network with variable resistance in time (for example, watersupply and water distribution systems of housing). By systematic analysis the indicator of economy of work and the object of water-supply system regulation are generalized with centrifugal pumps in its composition. The advanced mathematical models of centrifugal pumps' work are offered, which allow to determine their nominal parameters after the criterion of energy consumption minimum, to choose the optimal number of pumps during cascade control, to determine rational conditions for exploitation of pumps with application of occasion with the frequency adjusting. Requirements to the form and parameters of pumps' descriptions depending on the selected adjusting method are set. The method of pumps' selection at different values of degree of pump's serve unevenness is developed. The results of work are inculcated in a number of communal enterprises in Ukraine and used in educational process.