Abstract
Jatropha is proven to reduce dependence on diesel fuel. Jatropha oil is widely used as a mixture of diesel fuel. However, low heating value and high viscosity result in lower engine performance and higher carbon black emissions than pure diesel fuel. Alcohol groups such as butanol have low viscosity properties and oxygen and cetane numbers close to diesel fuel. The use of butanol as an additive to diesel-jatropha mixed fuels is expected to improve engine performance. This study aims to observe brake power, brake specific fuel consumption, and brake thermal efficiency of diesel engines using diesel-jatropha-butanol mixed fuel. Jatropha used 10%, 20% and 30%. While the butanol used is 5%, 10%, and 15% based on volume. The research increased in a brake power value of 2.22%. The decrease in brake specific fuel consumption was 4.81% and the increase in brake thermal efficiency was 10.85%. Keywords : jatropha, viscosity, performance, soot, butanol.
Highlights
Jatropa terbukti dapat mengurangi ketergantungan bahan bakar solar
This study aims to observe brake power, brake specific fuel consumption, and brake thermal efficiency of diesel engines using diesel-jatropha-butanol mixed fuel
Brake spesific fuel consumption mesin diesel berbahan bakar solar campuran jatropa dan butanol lebih rendah dibandingkan D100 kecuali dengan kandungan jatropa 30%
Summary
1. Brake Power Brake power (daya) adalah besarnya kerja telah dilakukan tiap satuan waktu. Dimana P adalah daya (k.W), T adalah torsi (N.m) dan N adalah putaran kerja (rpm) [13]. 2. Brake Spesific Fuel Consumption Brake spesific fuel consumption adalah laju aliran massa persatuan daya [13]. Dimana BSFC adalah konsumsi bahan bakar (kg/kW.jam), dan mf adalah laju aliran massa (kg/jam). Adalah perbandingan antara kerja mesin/daya (P) yang dihasilkan persiklus terhadap jumlah suplay energi per siklus yang dilepaskan selama pembakaran. Suplai energi yang dilepas selama pembakaran (mf) adalah massa bahan bakar yang disuplay per siklus dikalikan dengan nilai panas dari bahan bakar (QHV) [13]. Dimana BTE adalah efisiensi termal (%), QHV adalah nilai kalor dari bahan bakar (MJ/kg)
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