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Although sugarcane-trash (SCAR) energy represents a third of all sugarcane energy content, it continues to be the least studied of sugarcane agro-industrial residues. SCAR and bagasse moisture content were studied during the 2009-2010 and 2010-2011 milling seasons. It was determined that the percentage of dry and green matters represented 69% and 31% of the mass of SCAR, respectively. From an energy point of view, it was also established that there are no significant differences between the green and dry components of SCAR. Different analyses were carried out to estimate the High Heating Value (HHV) and Low Heating Value (LHV) of SCAR. In addition, meteorological factors and their influence on the moisture content of SCAR were studied during both milling seasons, and the variation in the energy content of SCAR during this period was controlled monthly. Regression models to SCAR moisture content forecasting were built and validated. The meteorological and geographical constrictions pertaining to the use of those models are discussed. Methodology to assess the feasibility of SCAR energy use was proposed.

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This paper aims to conduct a study of the problems associated with the wear of the needles and fuel injection nozzles utilized in diesel engines. The wear found on the needles is mainly associated to impurities in the fuel oil and microcavitation occurred due to high pressure in the phase of the air compression for combustion of the combustible fluid. These pressures associated with the temperature and the fluid velocity results in the occurrence of vaporization, which releases shock waves that cause damage to the affected surface. The impurities solid particles from the fuel oil cause problems inside the nozzles as obstruction of the holes and wear on the needle tip and nozzle seat surface. These failures affect in the atomization of the fuel, since the deterioration of the internal passages of the nozzles interferes in the spray formation and in the end passage of the fluid. For the execution of this study it will be used digital microscopic analysis in specimens that suffered damage, in order to investigate the effects of fuel property, and the temperature conditions and pressure in the formation of the wear on the needles and injector nozzle.