Desenvolvimento de indicadores de eficiência energética para avaliação de pivôs centrais de irrigação.

Abstract

With an irrigated area of approximately 650 thousand hectares, it is possible to estimate a consumption of 830 GWh per year due to center pivot systems in Brazil. Considering the lack of regulation concerning the specific consumption of these equipments, center pivot systems have a great potential to the implementation of efficiency measures as well as the need to propose a methodology for energy evaluation. Analyzing the irrigation as a subsystem consisting of an electric motor-pump, water supply and sprinkling systems, in this work is presented a methodology for the evaluation of its energy efficiency. General and specific indicators for the comparison of the center pivots concerning the use of water and energy are also proposed. The indicators proposed are applied to a center pivot under two conditions of energy efficiencies, it is obtained a reduction from 11,1793 kWh/(mm.hour.day) to 4,6771 kWh/(mm.hour.day), where 58.16% on energy savings is observed