Avaliação De Um Sistema Irrigação Por Aspersão Com Aplicação Do Inversor De Freqüência No Conjunto Motobomba

Abstract

AVALIAÇÃO DE UM SISTEMA IRRIGAÇÃO POR ASPERSÃO COM APLICAÇÃO DO INVERSOR DE FREQÜÊNCIA NO CONJUNTO MOTOBOMBA João Alberto Borges de Araújo1; Odivaldo José Seraphim2; Jair Antonio Cruz Siqueira3; Fernando Presenço4; Fernando de Lima Caneppele41 Departamento de Engenharia de Produção, Faculdade de Tecnologia, Botucatu, SP, araujo@fca.unesp.br2Departamento de Engenharia Rural, Faculdade de Ciëncias Agronömicas, Universidade Estadual Paulista, Botucatu, SP 3CCET – Universidade Estadual do Oeste do Paraná, Cascavel, PR4Faculdade de Ciëncias Agronömicas, Universidade Estadual Paulista, Botucatu, SP 1 Resumo Este trabalho teve o objetivo de avaliar a aplicação do inversor de freqüência sobre os parâmetros elétricos e hidráulicos no manejo de um sistema de irrigação por aspersão. Utilizou-se de um sistema de bombeamento convencional por aspersão com 4 linhas manejadas alternadamente, constando o manejo da abertura de 1, 2, 3 e 4 linhas simultaneamente. Posteriormente, no sistema convencional foi acoplado um sistema de acionamento com rotação variável, composto por um transdutor de pressão e um inversor de freqüência, os quais atuaram variando a rotação do conjunto motobomba e adequando a pressão estabelecida em relação à variação de vazão requerida pelo sistema. Os resultados encontrados permitiram avaliar que no sistema com inversor de freqüência houve redução do consumo de energia e a pressão de serviço dos aspersores foi mantida, variando apenas a vazão requerida, conforme o manejo das linhas. UNITERMOS: manejo de irrigação, consumo de energia, parâmetros hidráulicos ARAÚJO, J. A. B. de; SERAPHIM, O. J.; SIQUEIRA, J. A. C.; PRESENÇO, F; CANEPPELE, F. de L. EVALUATION OF A SPRINKLE IRRIGATION SYSTEM WITH THE USE OF A FREQUENCY INVERTER DRIVE 2 AbstractThis work aimed to evaluate the use of a frequency inverter drive on the electric and hydraulic parameters of a sprinkling irrigation system management. A conventional sprinkle water pump system with 4 alternate controlled lines, in which the opening of 1, 2, 3 and 4 lines occurred simultaneously; electric energy consumption and hydraulic parameters of the system were registered. Later on, this system was connected to a starting system with varied rotation, consisting of a pressure transducer and a frequency inverter drive, that made the water pump rotation vary and adapted the preset pressure in relation to f the flow variation requested by the system. Obtained results showed that, in the system with a frequency inverter drive, there was reduction of the electric energy consumption and the service pressure of the sprinkling was maintained, just varying the requested flow, for the simultaneous management of 1, 2 and 3 lines. KEYWORDS: irrigation management, energy consumption, hydraulic parameters

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

“…Córcoles et al (2019) evaluated the feasibility of using variable-frequency drives to capture water from wells for irrigation and found energy savings ranging from 6.8 to 23%, depending on the characteristics of the irrigated areas and the dynamic variations of the water depth in the well. Araújo et al (2006) obtained a power reduction of around 30% when using a variable-frequency drive in a conventional sprinkler system, considering the number of lateral lines in simultaneous operation.…”

“…It occurs because the initial investment for the acquisition of valves is higher than for the acquisition of the variable-frequency drive, the latter still providing a reduction in the cost related to energy consumption. The annual irrigation time was decisive for the feasibility of the use of the variable-frequency drives in other irrigation systems (Carvalho et al, 2000;Araújo et al, 2006;Córcoles et al, 2019). Araújo et al (2006) found the leveling point between the number of hours worked and the economic feasibility of variable-frequency drives in center pivot motor-pump sets, considering various powers of drives associated with different working pressures.…”

“…The annual irrigation time was decisive for the feasibility of the use of the variable-frequency drives in other irrigation systems (Carvalho et al, 2000;Araújo et al, 2006;Córcoles et al, 2019). Araújo et al (2006) found the leveling point between the number of hours worked and the economic feasibility of variable-frequency drives in center pivot motor-pump sets, considering various powers of drives associated with different working pressures. Córcoles et al (2019) pointed out that the economic feasibility of this equipment depends on several factors such as energy savings, drive cost, and applied water depths.…”

“…Pumping systems for irrigation are designed to work in the condition of maximum flow demand and total manometric head to meet all irrigation subunits (Lamaddalena & Khila, 2012;Khadra et al, 2016;Brar et al, 2017). However, some subunits require less power even at the time of maximum demand, and dissipative methods are commonly used to adjust the motor-pump operating point (Carvalho et al, 2000;Araújo et al, 2006).…”

“…Variable-frequency drives can provide better energy use efficiency in pumping systems, as the operation point of the motor-pump set is adjusted to the design point of each subunit by varying the motor supply frequency, acting on the control of its rotation (Araújo et al, 2006;Viholainen et al, 2013;Sungur et al, 2016;Valer et al, 2016). Thus, its use can provide an improvement in the pressure and flow control of irrigation systems, besides saving energy by avoiding the dissipation of hydraulic energy in pressure regulator devices (Burt et al, 2008).…”