TY - JOUR AU - Md. Mizanuzzaman PY - 2019/12/16 Y2 - 2024/03/29 TI - ENERGY AND EXERGY BASED ANALYSIS OF SI ENGINES USING METHANE, METHANOL AND OCTANE JF - MIST INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY JA - MIJST VL - 5 IS - 1 SE - ARTICLES DO - 10.47981/j.mijst.05(01)2017.127(%p) UR - https://mijst.mist.ac.bd/mijst/index.php/mijst/article/view/127 AB - In this study, the phenomena of air-fuel mixing and combustion of Methane, Methanol and octane hasbeen studied numerically in order to assess the thermodynamic analysis of the system. For this purpose, athermodynamic-based engine cycle model is developed without considering geometric features of fluid motion.Here a single cylinder four-stroke spark-ignition (SI) engine is considered as a system. Variable specific heatratio is considered instead of constant specific heat ratio. Empirical correlations are used to predict heat lossfrom the engine cylinder. Developed fundamental equations and empirical relations have been used in thismodel with the help of FORTRAN 95. In this study, friction losses are also modeled to estimate the overallenergy losses calculation. The effects of changing some design and operating parameters such as compressionratios and rpm on the variation and destruction of exergy have been investigated through the analysis. It wasfound that the design and operating conditions have considerable effects on the variation of energy, exergy andirreversibilities as well as the efficiency during investigated parts of the SI engine cycle. 1st law and 2nd lawefficiencies were found to increase for all the (three) fuels with increasing engine speed and compression ratios.The Present study recommends the necessity of both energy and exergy analysis to identify the source of workpotential losses for different fuels used in SI engine. ER -