Optimisation of exhaust emissions, vibration, and noise of unmodified diesel engine fuelled with canola biodiesel-diesel blends with natural gas addition by using response surface methodology | Science and Technology for Energy Transition (STET)

Open Access

Table 4

Test and predict values of engine responses for NO_x, CO, CO₂, and O₂ emissions for canola biodiesel.

Run	CNG addition (L/min)	Biodiesel ratio (%)	Engine speed (rpm)	Test				Prediction
Run	CNG addition (L/min)	Biodiesel ratio (%)	Engine speed (rpm)	NO_x (ppm)	CO (ppm)	CO₂ (%)	O₂ (%)	NO_x (ppm)	CO (%)	CO₂ (%)	O₂ (%)
1	15	20	2100	121	765	2.18	17.34	123.25	774.63	2.19	17.40
2	10	20	1800	111	623	1.99	17.78	111.00	623.00	2.04	17.78
3	10	20	1800	111	623	1.99	17.78	111.00	623.00	2.04	17.78
4	10	40	1500	85	415	1.38	18.67	89.00	435.25	1.40	18.72
5	15	20	1500	66	508	1.34	19.04	62.25	505.88	1.33	19.00
6	15	40	1800	112	755	2.07	17.43	111.75	736.88	2.07	17.42
7	5	20	1500	92	312	1.32	19.15	89.75	302.38	1.31	19.09
8	15	0	1800	78	730	1.93	17.65	120.88	740.63	1.94	17.64
9	10	0	1500	64	441	1.28	18.80	66.00	432.50	1.29	18.85
10	10	40	2100	153	630	2.30	17.08	151.00	638.50	2.29	17.03
11	10	20	1800	111	623	1.99	17.78	111.00	623.00	2.04	17.78
12	5	40	1800	133	485	2.06	17.52	131.25	474.38	2.06	17.53
13	5	20	2100	140	515	2.19	17.43	143.75	517.13	2.21	17.47
14	5	0	1800	108	524	1.94	17.69	108.25	542.13	1.94	17.70
15	10	0	2100	123	733	2.17	17.35	119.00	712.75	2.15	17.30
16	10	20	1800	111	623	1.99	17.78	111.00	623.00	2.04	17.78
17	10	20	1800	111	623	1.99	17.78	111.00	623.00	2.04	17.78

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