Buana, Erganata Surya (2025) ANALISIS PENGARUH AIRFUEL RATIO (AFR) TERHADAP PERFORMA DAN EMISI GAS BUANG MESIN DIESEL BERBAHAN BAKAR CRUDE PALM OIL (CPO) OFF-GRADE DAN B40 DENGAN VARIABEL PEMBEBANAN. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
The increasing demand for energy encourages the use of environmentally friendly alternative fuels, one of which is biodiesel derived from Crude Palm Oil (CPO). This study analyzes the effect of the air-fuel ratio (AFR) on the performance and emissions of diesel engines using B40 and off-grade CPO. Experimental testing was conducted on two Kubota RD 65 DI-NB diesel engines operating at a constant speed of 2000 RPM, with load variations of 1 kW and 4 kW. The AFR was controlled by adjusting the air supply using a blower and dimmer. The results showed that B40 delivered better performance than off-grade CPO, with increases in power, torque, and thermal efficiency of 7%, 4%, and 17.71% at a 1 kW load, and 4%, 2%, and 38.38% at a 4 kW load, respectively. In contrast, off-grade CPO exhibited higher specific fuel consumption (SFC) and greater exhaust emissions—particularly CO, HC, and smoke opacity—due to its high viscosity and free fatty acid content, which hinder the combustion process. However, CO₂ emissions from off-grade CPO were recorded to be 52% lower than those from B40. Increasing the AFR to an optimal range (around 40%) was effective in improving the combustion process and reducing emissions for both fuel types. These findings highlight the importance of AFR regulation in optimizing engine performance and emission efficiency, especially when utilizing non-standard fuels such as off-grade CPO
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TL Motor vehicles. Aeronautics. Astronautics |
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| Divisions: | Faculty of Engineering > Departement of Mechanical Engineering | ||||||||
| Depositing User: | Erganata Surya Buana | ||||||||
| Date Deposited: | 20 Jun 2025 06:56 | ||||||||
| Last Modified: | 20 Jun 2025 06:56 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/38820 |
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