Estudo da eficiência energética e análise da viabilidade econômica de um projeto de implantação de inversores de frequência em bombas industriais

Abstract

Turbo pumps or dynamic pumps are widely used in industry for a wide range of purposes, most of which are driven by electric induction motors. Most industries still use control valves for varying the flow of pumped fluid, which generate many negative consequences for the system. The variable speed drives implementation in these motors provides a significant reduction in the electric energy consumption and the maintenance costs of these equipment, being the main objective of this work to prove these costs’ reduction. The implementation project of variable speed drive in induction motor of a centrifugal pump with flow control valve should take several precautions to ensure the technical and economic feasibility of implementation. Therefore, this work calculated and analyzed the gains and losses provided by its application, using mathematical calculations based on centrifugal pumps theories through methodologies already widely used in technical means. At the end of the work, the result was that, with the variable speed drives implementation in centrifugal pumps, there is a decrease of 74% in electric energy consumption, generating savings of US $ 11,969.54 and increasing the system’s reliability and efficiency, generating a maintenance costs reduction of US $ 7,934.80. The estimated costs and the return on investment for adaptation and installation of the variable speed drive were also calculated, and the project implementation is highly attractive financially and a great investment opportunity.