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Research Papers: Alternative Energy Sources

J. Energy Resour. Technol. 2017;139(6):061201-061201-7. doi:10.1115/1.4036772.

The decrease of fossil fuels availability and the consequent increase of their price have led to a rapid evolution of renewable market and policy frameworks in recent years. Renewable resources include solar radiation, which is of considerable interest as it is inexhaustible, free, and clean. In order to calculate how much work can be obtained from solar radiation, several methods have been proposed in the literature and are here reviewed. In this paper, a single exergy factor to be applied to the total radiation measured on horizontal surface in a given place is proposed. The factor is estimated from both direct and diffuse radiation.

Commentary by Dr. Valentin Fuster

Research Papers: Fuel Combustion

J. Energy Resour. Technol. 2017;139(6):062202-062202-8. doi:10.1115/1.4036932.

In this study, the emissions from three passenger cars with gasoline, methanol, ethanol, and their blend were tested. The results show that the CO and HC emissions from the exhaust of the vehicles fueled with E7.5/M7.5 decrease compared with those from the vehicles fueled with the gasoline, E10 or M15, while NOx emissions increase by 7.5–25.8%. Formaldehyde and acetaldehyde are found higher for the vehicles fueled with E7.5/M7.5, whereas a series of volatile compounds become lower. Evaporative emissions of the vehicles fueled with E7.5/M7.5 were higher than those of the vehicles fueled with gasoline, by a range of 16.39–28.28%.

Commentary by Dr. Valentin Fuster

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