Quadratic Prediction Models for the Performance Comparison of a Marine Engine Fuelled with Biodiesels B5 and B20

Table 4

Accuracy check of the quadratic prediction model for biodiesel B5.

Speed (rpm)	Torque-B5 (Nm)		Error
	Measured value	Predicted value	(Nm)	Percentage	Absolute percentage
1000	785.10	786.77	1.67	0.21%	0.21%
1100	735.28	740.16	4.88	0.66%	0.66%
1200	640.12	621.52	−18.60	−2.91%	2.91%
1300	415.10	430.85	15.75	3.79%	3.79%
1400	171.89	168.14	−3.75	−2.18%	2.18%
Average or mean			0.008	−0.083%	1.95%
Interpretation				99.917% accuracy	Excellent prediction