Assessment of the achieved savings from induction motors energy efficiency labeling in Brazil.

Posted Leave a commentPosted in Artigo, Edson da Costa Bortoni, Excen, Jamil Haddad, Luiz Horta Nogueira, Marcos Vinícius Xavier Dias, Roberto Akira Yamachita

Since 1995 Brazil has been applying its labeling program to increase the efficiency of application of many household appliances and equipment. From 2003 on inductions motors have also been receiving the PROCEL2 prize, which helped push motors efficiency over than those limits established by the labeling program. Therefore, this work presents the development of a […]

Flow Measurement and Instrumentation: Calibration of weirs using unsteady flow.

Posted Leave a commentPosted in Artigo, Edson da Costa Bortoni, Excen

This paper presents a method for unsteady calibration of rectangular and triangular weirs using height measurement instead of another flow measurement device as a standard. The theoretical equation of the dependence of the flow with the head for that weir, as long as the covered area, must be known. The method is theoretically developed and […]

Potential of Sugarcane in Modern Energy Development in Southern Africa.

Posted Leave a commentPosted in Artigo, Excen, Luiz Horta Nogueira

Most of the population of Southern African lacks access to electricity and modern energy for cooking (FAO, 2012c; IEA, 2014a). Their heavy dependence on the traditional biomass for cooking direct affect the living conditions in this region. For example, charcoal and firewood supply more than 95% of the cooking energy consumption in Mozambique and Malawi. […]

Determinação de perdas e rendimento com uso de termografia infravermelha.

Posted Leave a commentPosted in Artigo, Edson da Costa Bortoni, Excen, Roberto Akira Yamachita

O presente trabalho busca obter as perdas e o rendimento do motor elétrico pelo método termográfico, o qual parte do princípio de que as perdas em um motor elétrico se dissipam na forma de calor, e o compara com um método tradicional de separação de perdas com medição direta da potência elétrica e mecânica. Ambos […]

Biodiesel program in Brazil: learning curve over ten years (2005-2015).

Posted Leave a commentPosted in Artigo, Excen, Luiz Horta Nogueira

The biodiesel blending mandate was launched at 2005 in Brazil, by a governmental program based mainly on sustainability concerns, especially toward social and environmental aspects. Since 2007, B7, i.e., 7% biodiesel in diesel, in volume terms, has been mandatory, and B10 is the next target. In this context, this paper aims to evaluate the biodiesel […]

Least-cost path analysis and multi-criteria assessment for routing electricity transmission lines.

Posted Leave a commentPosted in Afonso Henriques Moreira Santos, Excen

The classical approach for transmission line (TL) routing based on paper maps, aerial photographs and field visits can generate inconsistent results, besides being a time consuming and intensive labour activity. The application of methodologies based on geographic information system (GIS) combined with multi-criteria assessment (MCA) methods can generate time and cost savings on the planning […]

Flow profile investigation at Tucurui hydro power plant tailrace.

Posted Leave a commentPosted in Artigo, Edson da Costa Bortoni, Excen

This paper presents the application of acoustic Doppler current profiler as a tool for adjustment and validation of computational fluid dynamic models in river environment. The two tailraces of the Tucurui hydro power plant present strong differences. The bed of the left tailrace has a high bank and a curvature oriented towards the right. Thus, an […]

Mapeamento de valores de Nspt como subsídio ao planejamento de linhas de transmissão na Amazônia Oriental.

Posted Leave a commentPosted in Afonso Henriques Moreira Santos, Excen, Livro

O conhecimento de propriedades do solo é fundamental para diversos tipos de planejamento espacial, notadamente as infraestruturas lineares, tais como as linhas de transmissão. Isso ganha relevância em um contexto onde informações espaciais são restritas, como é caso da Amazônia Oriental. O objetivo deste trabalho foi realizar a espacialização da propriedade resistência do solo à […]

Estimation of Quadrature Axis Synchronous Reactance Using the Constant Excitation Test.

Posted Leave a commentPosted in Artigo, Edson da Costa Bortoni, Excen

This paper introduces the constant excitation test to be applied in synchronous machines. The results obtained from this test allow the determination of the quadrature axis synchronous reactance of the salient pole synchronous machines. Despite standard present methods for its determination, the proposed method is suitable for large installed machines. The method basis is described […]

Sugarcane: a way out of energy poverty.

Posted Leave a commentPosted in Artigo, Excen, Luiz Horta Nogueira

Universal access to modern energy is required if the world is to reduce poverty and enable sustainable development. Energy poverty is the lack of access to safe and efficient energy carriers. It affects more than 1.3 billion people without electricity and 2.7 billion without appropriate cooking facilities and fuels, particularly in sub-Saharan Africa (SSA). Under […]