Journal of Power and Energy Engineering, 2016, 4, 47-56 Published Online January 2016 in SciRes. http://www.scirp.org/journal/jpee http://dx.doi.org/10.4236/jpee.2016.41003 How to cite this paper: Sughayyer, M. (2016) Effects of Hydrogen Addition on Power and Emissions Outputs from Diesel Engines. Journal of Power and Energy Engineering, 4, 47-56. http://dx.doi.org/10.4236/jpee.2016.41003 Effects of Hydrogen Addition on Power and Emissions Outputs from Diesel Engines Momen Sughayyer Mechanical Engineering Department, Palestine Polytechnic University, Hebron, Palestine Received 24 November 2015; accepted 19 January 2016; published 22 January 2016 Copyright © 2016 by author and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract Energy efficiency and environmental impact have become dominant topics in internal combustion engines development. Among many strategies to improve power and emissions outputs from di- esel engines is the partial mix of hydrogen and air as fresh charge components to form extremely lean and homogenous mixture, which resist the spontaneous combustion, while diesel fuel is in- jected directly inside combustion chamber using the conventional fuel injection systems. This contribution presents an analytical and experimental investigation for the effects of adding hy- drogen on diesel engines power output and the reduction of emissions. Parametric analysis is used based on lamped parameters modeling of intake manifold to estimate in cylinder trapped charge. The fuel energy flow to engine cylinders is compared for a range of loads and concentrations to simulate relevant case studies. Diesel fuel reduction for significant range of part-load operation can be achieved by introducing hydrogen, along with power improvement emission reductions are affected positively as well. This is achievable without compromising the engine maximum effi- ciency, given that most engines are operated at small and part-load during normal driving condi- tions, which allow for introducing more hydrogen instead of large quantities of excess air during such operation conditions that also can be further improved by charge boosting. Keywords Energy Efficiency, Power and Emissions, Diesel Engines, Hydrogen, Air-Fuel Ratio 1. Introduction Currently, thermal systems are required to become energy efficient and produce less emission. Diesel engines are one of these systems that need to be considered for improvement in this respect. Hydrogen also is expected to become one of the most important fuels for reducing greenhouse gas emission problem in the near future. Based on the characteristics of both fuels, this contribution provides an insight into the possibility of improving