Desempenho Produtivo E Econômico Da Cultura Da Melancia Submetida a Diferentes Turnos De Rega

Fernandes, Carlos Newdmar Vieira; Azevedo, Benito Moreira de; Neto, Joaquim Raimundo do Nascimento; Viana, Thales Vinícius de Araújo; Campêlo, André Rufino

doi:10.15809/irriga.2014v19n1p149

Cited by 3 publications

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“…Várias estudos (FERNANDES et al, 2014;CALDAS;REZENDE, 2016;ALVES et al, 2017; CHAMBA; ZUBELZU; JUANA, 2019) vem sendo realizados com o propósito de maximizar a eficiência de projetos de irrigação, principalmente quando relacionados à parte hidráulica do sistema (ZOCOLER et al, 2011), no aprimoramento do manejo de irrigação e nas relações de custo dos sistemas (SONOWAL; SENAPATI; ADAMALA, 2016). Perroni et al (2015) ressaltam que no uso da irrigação como acréscimo tecnológico é de suma importância a utilização dos recursos hídricos e energéticos disponíveis de forma racional, para a própria sustentabilidade da agricultura irrigada.…”

Section: Introductionunclassified

Modelo Matemático Para Determinação Do Diâmetro Econômico De Tubulações De Recalque

Pimenta

Robaina²,

Peiter³

et al. 2019

R_I

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MODELO MATEMÁTICO PARA DETERMINAÇÃO DO DIÂMETRO ECONÔMICO DE TUBULAÇÕES DE RECALQUE BRUNA DALCIN PIMENTA1; ADROALDO DIAS ROBAINA1; MARCIA XAVIER PEITER1; JHOSEFE BRUNING1; MIGUEL CHAIBEN NETO1 E YESICA RAMIREZ FLORES1 1Programa de Pós-Graduação em Engenharia Agrícola, Universidade Federal de Santa Maria/RS, Av. Roraima, nº 1000, Bairro Camobi, Santa Maria/RS, Brasil, CEP 97105-900, brunadpimenta@gmail.com, diasrobaina@gmail.com, mpeiter@gmail.com, jhosefe.b@gmail.com, miguelchaiben@gmail.com, yeyiramiflo@gmail.com. 1 RESUMO O conhecimento do diâmetro econômico de tubulações é de grande importância em dimensionamentos de sistemas de recalque, pois, assim, é possível otimizar os custos de sistemas de irrigação. O objetivo deste trabalho foi propor um modelo matemático para o cálculo do diâmetro econômico de tubulações de recalque utilizadas em sistemas de bombeamento de água para irrigação. Na modelagem matemática do cálculo do diâmetro econômico foi utilizada, para mensurar a perda de carga, a equação de Hazen-Williams, levando em consideração o custo das tubulações, o custo do conjunto motobomba, o custo da energia consumida e o fator de recuperação do capital. Nas simulações foram utilizadas vazões de 25 a 500 l s-1, em intervalos de 25 l s-1, fator de recuperação do capital de 10, 15 e 20%, e preço da energia consumida de US$0,09, US$0,10 e US$0,11 kWh-1, para tubos de aço com espessura de 2,00mm, 2,65mm e 3,00mm. Para validação do modelo proposto, por meio da comparação com um modelo que utiliza a formulação de Darcy-Weisbach, foram utilizadas a raiz média do desvio quadrático, a raiz média do desvio quadrático normalizado, a eficiência do modelo e o índice geral de desempenho do modelo. Os resultados indicam que o modelo proposto apresenta índice geral de desempenho próximos a 1,00 em todos os cenários, podendo, dessa forma, ser utilizado com precisão para determinação do diâmetro econômico de tubulações de recalque sem necessidade do uso de equações que necessitam de processos iterativos para sua solução. Palavras-chave: modelagem, irrigação, consumo de energia, Hazen-Williams. PIMENTA, B. D.; ROBAINA, A. D.; PEITER, M. X.; BRUNING, J.; CHAIBEN NETO, M. E FLORES, Y. R. MATHEMATICAL MODEL FOR DETERMINING THE ECONOMIC DIAMETER OF PRESSURIZED PIPES 2 ABSTRACT The knowledge of the economic diameter of pipelines is of great importance in the design of water pumping systems because it makes possible to optimize costs of irrigation systems. The objective of this work was to propose a mathematical model for the calculation of the economic diameter of pressurized pipes used in water pumping systems for irrigation. In the economic diameter calculation mathematical modeling Hazen-Williams equation was used to measure loss of load, taking into account the pipes’ cost, the cost of the motor pump, the cost of the energy consumed and the recovery factor of the capital. In the simulations, flow rates of 25 to 500 l s-1 were used, in intervals of 25 l s-1, capital recovery factor of 10, 15 and 20%, and energy price of US$0.09, US$0.10 and US$0.11 kWh-1, for steel pipes with thickness of 2.00mm, 2.65mm and 3.00mm. For validation of the proposed model, through comparison with a model using Darcy-Weisbach formulation, the mean root of the quadratic deviation, the mean root of the normalized quadratic deviation, the model efficiency and the overall performance index of the model were used. The results indicate that the proposed model presents a general index of performance close to 1.00 in all scenarios and can therefore be used with precision to determine the economic diameter of pressurized pipes without the use of equations that require processes solutions. Keywords: modeling, irrigation, energy consumption, Hazen-Williams.

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Section: Introductionunclassified

Modelo Matemático Para Determinação Do Diâmetro Econômico De Tubulações De Recalque

Pimenta

Robaina²,

Peiter³

et al. 2019

R_I

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“…in the use of water, since the growing process is significantly impacted by water availability, either by the lack or excess of it (Simões et al, 2016;Fernandes et al, 2014).…”

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Economic Analysis of Different Irrigation Depths in Forage Sorghum Crops

Sousa

Viana

Carvalho

et al. 2020

RBMS

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The objective of this work was to evaluate the production costs and profitability indexes of sorghum crop for silage production under different irrigation depths. The work was conducted at the Federal Institute of Education, Science and Technology of Ceará (IFCE) – Umirim Campus, from September to December 2016. The treatments were arranged in 5 x 5 split plots with 5 replications. Irrigations were performed on a daily basis, and the applied depths were calculated based on crop evapotranspiration (ETc). The primary treatments were 50, 75, 100, 125 and 150% of ETc, associated with different levels of carnauba bagana mulch (0.00, 2.50, 3.75, 5.00, and 6.25 cm). Effective Operating Cost (EOC), Total Operating Cost (TOC), Gross Revenue (GR), Operating Profit (OP), Profitability Index (PI) and Break-Even Price (BEP) were estimated. According to the indicators analyzed, it was found that this is a promising crop within the different agricultural production schools, with favorable rates for the producer. The variety evaluated presents high resistance as to the water limitation factor, showing positive indicators such as break-even point below the average prices practiced in the region.

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The Production Performance of Fodder Sorghum According to Irrigation Sheets and Land Cover

Sousa

Viana

Carvalho

et al. 2021

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The objective of the present work was to evaluate the productivity and efficiency of the use of the water in the culture of sorghum forager (BRS Black Tip) under different blades of irrigation (50; 75; 100; 125 and 150% of the evapotranspiration of the culture, ETc) associates the different levels of covering deceased (mulch) (0.00; 2.50; 3.75; 5.00 and 6.25 cm). The experimental delineation was made use in subdivided parcels, 5 x 5 with 5 repetitions, having totalized 125 experimental units. It was analyzed: productivity of cool mass, productivity of dry substance, productivity of seed, weight of 100 seed, weight of the seed for panicle, efficiency of use of the water in the production of cool mass in (kg m-3 and R$ m-3). For the results it was possible to conclude that, the factors of production in irrigation blades and in bagana coverage had been promising for the productivity of the culture of sorgo; The significant effect for efficiency in the use of the water in the 0 variable of productivity of cool biomass and dry substance in kg m-3 and R$ m-3, indicate this being a promising culture for the region, associated with the adopted techniques of culture in the present work.

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Desempenho Produtivo E Econômico Da Cultura Da Melancia Submetida a Diferentes Turnos De Rega

Cited by 3 publications

References 0 publications

Modelo Matemático Para Determinação Do Diâmetro Econômico De Tubulações De Recalque

Modelo Matemático Para Determinação Do Diâmetro Econômico De Tubulações De Recalque

Economic Analysis of Different Irrigation Depths in Forage Sorghum Crops

The Production Performance of Fodder Sorghum According to Irrigation Sheets and Land Cover

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