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 […]
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 […]
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. […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
Hydropower has long been recognized as a renewable power source. Due to economic reasons, high and medium head potentials have been primarily developed. Later, low-head potentials became a feasible solution with the application of modern Bulb generators. Although Bulb generators have been developed and applied since the 1930s, new techniques and materials have been used […]