A. Shirneshan - Islamic Azad University Najafabad
M. Almassi - Islamic Azad University, Tehran
B. Ghobadian - Tarbiat Modares University Tehran
Gh. Najafi - Tarbiat Modares University Tehran

Nowadays biodiesel is receiving more attention as a most important renewable energy for using in diesel engines. Inthis research, the application of Response Surface Methodology (RSM) was highlighted to investigate the effects of biodiesel-diesel blends (B۰, B۲۰, B۵۰ and B۱۰۰), engine operating parameters (engine load and  speed) on CO۲ emission of a diesel engine. The experiments were conducted on a four cylinder direct-injection diesel engine based on three-factor five-level central composite rotatable design. The developed mathematical models were helpful to predict the response parameters and further to identify the significant interactions between the input factors and the responses. The use of biodiesel resulted in higher emission of CO۲. The results also showed that an increase in engine speed  leads to an increase in the emission of CO۲.On the other hand,CO۲ emission is higher at low engine loads,while is lower at high engine loads.

Biodiesel, CO۲ Emission, RSM, Diesel Engine