Author(s): Md. Rezaul Karim Sikder and Mohammad Zoynal Abedin

Abstract: In the modern world, energy has become a basic necessity for every nation, and fossil fuels which are readily available and satisfy this need. As a result, research is being done in the energy sector to develop fuel-based energy conversion devices. The fuel consumption can be decreased while also maximizing the utilization of available energy. This study paper reviews the energy and exergy analysis of IC engines based on natural gas, which are investigated for performance enhancement by altering parameters. It is found that maximum energy is obtained at crankshaft speed of 2500 rpm, which are 29.78% and engine is VSG413 SI type with 95 octane gasolines. The test engine has 1.3 volumes, four strokes, four-cylinder, 45 kW maximum power capacity and 98 N-m maximum torque capacity. The maximum exergy efficiency is obtauned 59.76% and confirms that toluene RORC assembly is the best alternative for this natural gas engine. Engine rpm 1482 speed, a 120.2 L/min natural gas flow, 1.784 lambda, and 1758.77 kW of mechanical engine power. The exergy analysis reveals that the engine optimum speed is 1482 rpm, as the exergy efficiency has a maximum magnitude at this speed. In fact, this research demonstrates that choosing the ideal engine speed should not be done just based on the energy analysis. The amount of energy discarded by the cooling system increases at low speeds and is smaller as the speed rises. On the other hand, as the speed rises, the energy that heated gases lose increases. In the engine, irreversible processes such combustion, heat transmission, and friction depletes a sizeable portion of the fuel energy. Additionally, as engine speed rises, the sources of energy destruction like friction and heat transfer also increase.

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