Metodologia De Eficiência Energética Aplicada Em Sistemas De Bombeamento

Abstract

Resumo-O objetivo deste trabalho é apresentar uma metodologia de comparação do desempenho de sistemas de bombeamento controlados por válvulas de estrangulamento e a utilização de inversores de freqüência no controle da vazão. Adicionalmente, identificar a redução do consumo de energia elétrica bem como justificativas da escolha de um sistema em detrimento do outro. Palavras-Chaveeficiência energética, inversor de freqüência, sistemas de bombeamento.

Technical and Economic Feasibility of Using a Variable-Frequency Drive in Micro-Irrigation Systems

“…In cases in which the motor-pump set is oversized, as is the analyzed case, the slope does not affect the pumping costs when the drive is not used because excess pressure is dissipated in the form of pressure loss in the control valve, increasing the power that can be saved using the variable-frequency drive. Ferreira et al (2008) analyzed energy efficiency in pumping systems and found that the potential for electricity savings when using a variable-frequency drive instead of the dissipative method depends on the proximity of the project point to the motor-pump operation point. Figure 3 shows the total annual costs under the conditions with and without the variable-frequency drive, terrain slopes of 0, 5, and 10%, and annual irrigation time of 500, 1000, 1500, 2000 h. The total annual cost is higher when no variable-frequency drive is used, regardless of the annual irrigation time.…”