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Neat diesel beats waste-oriented biodiesel from the exergoeconomic and exergoenvironmental point of views

Lookup NU author(s): Dr Mohammad RajaeifarORCiD

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Abstract

In the present study, a DI diesel engine operating on various diesel/biodiesel blends containing different amounts of polymer waste was thermodynamically scrutinized using two exergy-based methods, i.e., exergoeconomic and exergoenvironmental analyses for the first time. Exergoeconomic and exergoenvironmental parameters were calculated for five fuel blends utilized throughout this study at different engine loads and speeds. These approaches were used to make decisions on fuel composition and engine operational conditions by taking into account the financial and environmental issues. The results showed that the exergoeconomic and exergoenvironmental parameters varied profoundly with engine load and speed. In general, increasing engine load remarkably decreased the unit cost and the unit environmental impact of the shaft work exergy, while enhancing engine speed acted oppositely. More specifically, the lowest unit cost and unit environmental impact of full load work exergy were found to be 36.08 USD/MJ and 32.03 mPts/GJ for neat diesel and B₅ containing 75 g EPS/L biodiesel, respectively, both at engine speed of 1600 min⁻¹. Moreover, the exergoeconomic and exergoenvironmental factors of the diesel engine were very poor due to the higher thermodynamic losses occurring during the combustion process. Although the maximum exergetic efficiency of the diesel engine was obtained for B₅ including 50 g EPS/L biodiesel, the exergoeconomic and exergoenvironmental analyses could not detect any spectacular differences among the fuel blends applied. Overall, using biodiesel in neat or blended form appeared to be less attractive strategy from the exergoeconomic and exergoenvironmental perspectives considering the current biodiesel prices and production technologies.

Publication metadata

Author(s): Aghbashlo M, Tabatabaei M, Mohammadi P, Khoshnevisan B, Rajaeifar MA, Pakzad M

Publication type: Article

Publication status: Published

Journal: Energy Conversion and Management

Year: 2017

Volume: 148

Pages: 1-15

Print publication date: 15/09/2017

Online publication date: 31/05/2017

Acceptance date: 20/05/2017

ISSN (print): 0196-8904

ISSN (electronic): 1879-2227

Publisher: Elsevier

URL: https://doi.org/10.1016/j.enconman.2017.05.048

DOI: 10.1016/j.enconman.2017.05.048

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