Title: Exergy and environmental analyses of natural gas and biogas fuels in an internal combustion engine at part load

Authors: Yasar Bulbul; Altay Arbak; Yasin Karagöz; Selman Karagöz; Tarkan Sandalci; Saban Pusat

Addresses: Department of Economics, Istanbul Medeniyet University, Istanbul, Turkey ' Department of Mechanical Engineering, Istanbul Medeniyet University, Istanbul, Turkey ' Department of Mechanical Engineering, Istanbul Medeniyet University, Istanbul, Turkey ' School of Strategy and Leadership, Coventry University, Coventry CV1 5FB, UK ' Department of Mechanical Engineering, Yildiz Technical University, Istanbul, Turkey ' Department of Mechanical Engineering, Yildiz Technical University, Istanbul, Turkey

Abstract: This paper presents an experimental investigation on a single-cylinder diesel engine fuelled with natural gas and biogas. Biogas was obtained by mixing methane and carbon dioxide (CO₂). The analyses were carried out by using the results of experiments on different fuel mixtures at constant engine power. As a result of working at partial load, the energy and exergy efficiencies of the engine were relatively low. When the results were compared by CO₂ content of the fuel, it was observed that when the CO₂ ratio increased, the exergy efficiency decreased. In addition, an economic analysis was performed based on the equivalent CO₂ emission and the average carbon tax in the European Union. Accordingly, natural gas had the highest GWP value and tax amount. As the CO₂ content in the fuel increased, the global warming potential (GWP) and the carbon tax to be paid decreased.

Keywords: exergy analysis; environmental analysis; economic analysis; biogas; internal combustion engine.

DOI: 10.1504/IJEX.2023.135836

International Journal of Exergy, 2023 Vol.42 No.4, pp.337 - 349

Received: 17 Nov 2022
Received in revised form: 03 Apr 2023
Accepted: 09 Apr 2023
Published online: 08 Jan 2024 *

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