Editing Auxiliary power (section)

== Uses/Implementations ==
Many uses and implementations of auxiliary power are experimented with to increase its efficiency. One such experimentation was to find a better way to operate a [[diesel engine]] with [[fuel cell]] based auxiliary power units.  The method of which is to separate [[hydrogen]]-rich gas from the [[diesel fuel]] to generate [[electricity]] separately in an auxiliary power unit.<ref name=":0">Samsun, Krekel, Pasel, Prawitz, Peters, & Stolten. (2017). A diesel fuel processor for fuel-cell-based auxiliary power unit applications. ''Journal of Power Sources,'' ''355'', 44-52.</ref>  With this process, an effective reduction in emissions can be achieved by lowering the consumed volume of gas per hour. However, upon  power demands reaching 60% a sharp decrease in performance occurs, which can be solved by using a diesel or kerosine fuel with a maximum CO concentration of 1.5%.<ref name=":0" />

There are a variety of other implementations of auxiliary power units in energy systems. This explains for how a significant portion of emissions come from commercial vehicles.  Diesel engines operating within densely populated areas, running within an ineffective range in order to power their auxiliary systems, such as [[refrigeration]], are contributors to a large portion of the emissions from automobiles.<ref name=":1">Matulic, N., Radica, G., Barbir, F., & Nizetic, S. (2018). Commercial vehicle auxiliary loads powered by PEM fuel cell. ''International Journal of Hydrogen Energy.'' doi: 10.1016/j.ijhydene.2018.12.121</ref>  Using a model with a diesel powered four-stroke engine on a truck with 100% load capacity driving a combination of typical urban and city road cycles, emissions and auxiliary power demand were recorded.  Then by using the calculated auxiliary power demand, a source was developed to support the demand for the auxiliary systems in the form of a PEM fuel cell.  The end product of the PEM fuel cell was able to support the auxiliary systems of the truck using a maximum of 5&nbsp;kW of power.  This input was able to sustain the cooling chamber, cabin [[Air conditioning|air-conditioning]], radio unit, etc.<ref name=":1" />  The introduction of this fuel cell also contributed to a 9% reduction in diesel fuel consumption and 9.6% reduction in {{CO2}} emissions.<ref name=":1" />