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Energy and exergy analyses of a diesel engine fuelled with biodiesel-diesel blends containing 5% bioethanol
Scopus
Open Access Toplam 116 atıf DOI
In this study, energy and exergy analysis were performed for a single cylinder, water-cooled diesel engine using biodiesel, diesel and bioethanol blends. Each experiment was performed at twelve different engine speeds between 1000 and 3000 rev/min at intervals of 200 rev/min for four different fuel blends. The fuel blends, prepared by mixing biodiesel and diesel in different proportions fuel with 5% bioethanol, are identified as D92B3E5 (92% diesel, 3% biodiesel and 5% bioethanol), D85B10E5 (85% diesel, 10% biodiesel and 5% bioethanol), D80B15E5(80% diesel, 15% biodiesel and 5% bioethanol) and D75B20E5 (75% diesel, 20% biodiesel and 5% bioethanol). The effect of blends on energy and exergy analysis was investigated for the different engine speeds and all the results were compared with effect of D100 reference fuel. The maximum thermal efficiencies obtained were 31.42% at 1500 rev/min for D100 and 31.42%, 28.68%, 28.1%, 28% and 27.18% at 1400 rev/min, respectively, for D92B3E5, D85B10E5, D80B15E5, D75B20E5. Maximum exergetic efficiencies were also obtained as 29.38%, 26.8%, 26.33%, 26.15% and 25.38%, respectively, for the abovementioned fuels. As a result of our analyses, it was determined that D100 fuel has a slightly higher thermal and exergetic efficiency than other fuel blends and all the results are quite close to each other.
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Comparative energy, exergy, exergoeconomic, and exergoenvironmental economic analyses of hydrogen enrichment via port injection in a propane-operated SI engine under partial load conditions
Scopus
Havuzumuzda
This study comparatively investigates the energy, exergy, exergoeconomic, exergoenviroeconomic, and environmental impact analyses of a hydrogen-enriched propane spark-ignition (SI) engine. While propane fuel is used as the primary fuel in the SI engine, hydrogen enrichment is achieved via the port injection method at different flow rates. The experiments are conducted at a constant engine speed under lean combustion conditions (from λ = 1.0 to λ = 1.4) under partial load conditions. The aim of this study is to comparatively examine the low performance of propane fuel, which is commercially used in many countries, under lean combustion conditions, with respect to performance, exergy efficiency, power cost, environmental costs, and sustainability as a result of hydrogen enrichment. The results indicate that the highest exergy efficiency of 23.64% is obtained at λ = 1.4 with a hydrogen flow rate of 21 L/min, and that the increase in exergy efficiency exceeds 90% compared to propane combustion under the same conditions. In addition, at λ = 1.4 and a hydrogen flow rate of 21 L/min, the lowest power cost of 86.48 $/GJ is recorded, corresponding to a 51.1% reduction in power cost compared to propane. The results of the exergy-based enviroeconomic analysis show that hydrogen reduces the environmental and enviroeconomic impacts under stoichiometric conditions, and although environmental impacts increase with mixture leaning, the obtained results are still lower than the environmental impact of propane under stoichiometric conditions.
Atıf Yapan Makale Bilgileri
Kurumlar (2)
Selçuk Üniversitesi
Selçuklu, Turkey
Süleyman Demirel Üniversitesi
Isparta, Turkey