International Conference on Secure Systems Design and Technology Development (SysTechDev 2026)

Comparative Analysis of Efficiency Variation in a Dual-Fuel Diesel Engine Fueled with Methane and Hydrogen with Economic Assessment

Not scheduled

20m

''Vasil Levski'' National Military University

Paper – Oral Presentation Sustainable Energy Engineering and Applications

Speaker

Atanasi Tashev (Department of Transport and Aircraft Equipment and Technologies, Faculty of Mechanical Engineering, Technical University of Sofia, Plovdiv Branch, 25 Tsanko Dyustabanov Street, 4000 Plovdiv , Bulgaria)

Description

This study presents a comparative investigation of the efficiency characteristics of a compression ignition engine operating in dual-fuel mode with methane (CNG) and hydrogen (H₂) as supplementary fuels. The research focuses on evaluating the variation in effective thermal efficiency when conventional diesel fuel is partially substituted by gaseous fuels under comparable operating conditions.
Experimental measurements were conducted on a diesel engine operating in a gas–diesel cycle, where controlled quantities of methane and hydrogen were introduced into the intake air.
The results indicate distinct differences in the combustion behavior and efficiency trends between methane- and hydrogen-enriched operation.
In addition to the thermodynamic analysis, an economic assessment is performed to evaluate the feasibility of both dual-fuel approaches. The cost of energy production is analyzed based on current fuel prices, considering the trade-off between efficiency improvement and fuel cost.
The findings contribute to a better understanding of alternative fuel utilization in diesel engines and provide a basis for optimizing dual-fuel strategies from both energetic and economic perspectives.