Model to design drip hose lateral line using two spacing between emitters

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dc.contributor.authorLudwig, Rafael [UNESP]
dc.contributor.authorSaad, João Carlos Cury [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:27:24Z
dc.date.available2014-05-27T11:27:24Z
dc.date.issued2012-12-01
dc.description.abstractThe use of non-pressure compensating drip hose in horticultural and annual cycle fruits is growing in Brazil. In this case, the challenge for designers is getting longer lateral lines with high values of uniformity. The objective of this study was to develop a model to design longer lateral lines using non-pressure compensating drip hose. Using the developed model, the hypotheses to be evaluated were: a) the use of two different spacing between emitters in the same lateral line allows longer length; b) it is possible to get longer lateral lines using high values of pressure variation in the lateral lines since the distribution uniformity stays below allowable limits. A computer program was developed in Delphi based on the model developed and it is able to design lateral lines in level using non-pressure compensating drip hose. The input data are: desired distribution uniformity (DU); initial and final pressure in the lateral line; coefficients of relationship between emitter discharge and pressure head; hose internal diameter; pipe cross-sectional area with the dripper; and roughness coefficient for the Hazen-Williams equation. The program allows calculate the lateral line length with three possibilities: selecting two spacing between emitters and defining the exchange point; using two pre-established spacing between emitters and calculating the length of each section with different spacing; using one emitter spacing. Results showed that the use of two sections with different spacing between drippers in the lateral line didn't allow longer length but got better uniformity when compared with lateral line with one spacing between emitters. The adoption of two spacing increased the flow rate per meter in the final section which represented approximately 80% of the lateral line total length and this justifies their use. The software allowed DU above 90% with pressure head variation of 40% and the use of two spacing between emitters. The developed model/software showed to be accurate, easy to handle and useful for lateral line design using non-pressure compensating drip hose.en
dc.description.affiliationUniversidade Estadual Paulista Julio Mesquita Filho, F. L. P. I: Rua José Barbosa de Barros, no 1780
dc.description.affiliationUnespUniversidade Estadual Paulista Julio Mesquita Filho, F. L. P. I: Rua José Barbosa de Barros, no 1780
dc.format.extent4610-4620
dc.identifierhttps://elibrary.asabe.org/azdez.asp?JID=5&AID=41980&CID=dall2012&T=2
dc.identifier.citationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, v. 6, p. 4610-4620.
dc.identifier.file2-s2.0-84871786887.pdf
dc.identifier.scopus2-s2.0-84871786887
dc.identifier.urihttp://hdl.handle.net/11449/74034
dc.language.isoeng
dc.relation.ispartofAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectEmission uniformity
dc.subjectEmitter spacing
dc.subjectLocalized irrigation
dc.subjectAnnual cycle
dc.subjectCross sectional area
dc.subjectDeveloped model
dc.subjectDistribution uniformity
dc.subjectFinal pressure
dc.subjectInput datas
dc.subjectInternal diameters
dc.subjectLine design
dc.subjectNon-pressure compensating
dc.subjectPressure heads
dc.subjectPressure variations
dc.subjectRoughness coefficient
dc.subjectTotal length
dc.subjectTwo section
dc.subjectAgriculture
dc.subjectDesign
dc.subjectHose
dc.titleModel to design drip hose lateral line using two spacing between emittersen
dc.typeTrabalho apresentado em evento
dcterms.licensehttp://www.asabe.org/publications/authors/copyright-questions.aspx
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agronômicas, Botucatupt
unesp.departmentEngenharia Rural - FCApt

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Botucatu - FCA - Faculdade de Ciências Agronômicas