Abstract
This experimental study evaluates the feasibility of supporting compression ignition engine that primary run on diesel fuel with hydrogen gas that is produced by solar-hydrogen cycle. A photovoltaic panel is used to produce hydrogen through electrolysis from solar energy. Different mass ratio of hydrogen enrichment to liquid diesel fuel are tested on an engine operating under fixed torque of 14.7 N-m and engine rotational speed of 1100 rpm. Under same loading condition, the study shows that hydrogen can be used to reduce diesel fuel consumption and CO2 emission however this comes on the cost of increasing of NOx emission. The results show that beyond a maximum mass ratio of hydrogen-to-diesel of 9.7%, the engine starts knocking. The experiment shows that adding hydrogen to the air intake of a diesel requires a simple pluming operation in which hydrogen is allowed to enter the engine from the air intake manifold and hence the cost of retrofitting of current diesel engine is considered marginal.
Highlights
Hydrogen is a good candidate fuel that can replace or reduce the dependence on petroleum fuel
Lee et al has reported an increase in thermal efficiency of 22% for dual injection at low loads and 5% at high loads compared to direct injection
4.1 Engine performance under different hydrogen to diesel mass ratios: The study presents the effect of gaseous fuel enrichments on diesel engine under constant partial load of 1.69 kW
Summary
Hydrogen is a good candidate fuel that can replace or reduce the dependence on petroleum fuel. The high self-ignition temperature has prevented the used of hydrogen fuel as a sole fuel in a compression ignition (CI) engine. Masood et al [3] reported a brake thermal efficiency of 30% when hydrogen is used in the dual fuel mode with diesel at a compression ratio of 24.5. Lee et al [4] studied the performance of dual hydrogen-diesel fuel engine by using solenoid in-cylinder injection and external fuel injection technique. Lee et al has reported an increase in thermal efficiency of 22% for dual injection at low loads and 5% at high loads compared to direct injection. Lee et al [5] indicated that in dual injection, the stability and maximum power is accomplished by direct injection of hydrogen.
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