International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 05 | May -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1279 Second Law Analysis of Compression Ignition Engine fuelled with Ethanol Blending by Using Heat Transfer Models Ankush N.Pise 1 , Prof. M.M.Deshmukh 2 1 M. Tech student, Thermal Engineering, Govt. College of Engineering, Amravati (M.S), India 2 Associate Professor, Mechanical Engineering Dept., Govt. College of Engineering, Amravati (M.S), India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Modeling activities can make major contributions to engine engineering at different levels of generality or detail, corresponding to different stages of model development. The modeling of engine processes continues to develop as our basic understanding and knowledge of the physics and chemistry of the phenomena of interest steadily expands. The model developed is single zone zero dimensional model. Once the heat release rate is modeled the pressure and temperature are predicted for every crank position. The heat transfer model is one of them, which can be very useful to understand engine processes. A single zone, zero dimensional models is developed for simulation. Four different types of heat transfer models are taken to compare to find out the best of them. The diesel engine fuelled with ethanol blends like 10%E, 20%E, 30%, and pure diesel is considered as closed system for thermodynamics analysis. The cylinder gases are assumed as ideal gas. The developed model is validated against the data obtained by experimentation at laboratory. Both experimental and mathematical data are compared. It is found that Hohenberge correlation is best to calculate the engine cycle results. Eichelberg’s model can also be a good choice. Tuning is required for the Woschni model to have good accuracy. Key Words: Second law analysis, Heat Transfer Models, Diesel Engine, Engine Modelling 1. INTRODUCTION Thermodynamic models of the real engine cycle have served as effective tools for complete analysis of engine performance and sensitivity to various operating parameters on the other hand, It has long been understood that traditional first-law analysis, which is needed for modeling the engine processes, often fails to give the engineer the best insight into the engineǯs operation. In order to analyze engine performance – that is, evaluate the inefficiencies associated with the various processes – second-law analysis must be applied [3]. Second-law analysis with its more Ǯinteriorǯ study of what is happening during a process contributes a new way of thinking and studying thermodynamic processes, a fact providing more flexibility and field for improvement to the engineer [1]. The use of second law analysis is not necessarily intended for general performance computations but for understanding the details of the overall thermodynamics of engine operations. The second law of thermodynamics is a useful statement of related physical observations that has a wide range of implications with respect to engineering design and operation of thermal systems. The second law can be used to determine the direction of process, establish the condition of equilibrium, to specify the maximum possible performance of thermal systems and identify those aspects of processes that are significant to overall performance [10]. The second-law analysis provides a more critical and thorough insight into the engine processes by defining the term of availability destruction or irreversibility and assigning different magnitude to the exhaust gases and heat losses terms. By so doing, it spots specific engine processes and parameters, which can improve the engine performance by affecting engine or subsystems irreversibilityǯs and the availability terms associated with the exhaust gases (to ambient) and heat losses to the cylinder walls. Most of the analyses so far have focused on the dominant combustion irreversibilityǯs term. )t was shown that combustion duration, heat release shape, i.e. premixed burning fraction, and injection timing only marginally affect combustion irreversibilityǯs ȋalthough the latterǯs impact on work, heat transfer and exhaust gases availability is significant), the combustion irreversibility production rate is a function of fuel reaction rate only, and also an increasing pre-chamber volume increases the amount of total combustion irreversibilityǯs [ͻ]. The majority of different reports and studies have investigated the influence of heat transfer, combustion, friction and mixing processes on availability destruction suggesting different options to reduce energy degradation and increase portion of energy available for useful work [10]. Objectives of second-law application to internal combustion engines are: 1. To weigh the various processes and devices, calculating the ability of each one of these to produce work. 2. To identify those processes in which destruction or loss of availability occurs and to detect the sources for these destructions. 3. To quantify the various losses and destructions.