Emission and Performance Optimization of Marine Four-Stroke Dual-Fuel Engine Based on Response Surface Methodology

Table 2

Calculation error of the gas mode.

Engine load (%)	100	75	50	25
Mode	Gas mode error (%)
Power (kW)	0.12	0.14	−0.09	0.38
BSFC (g·k^−1W^−1h^−1)	−0.09	−0.11	0.13	−0.34
Peak comb. press. (bar)	−1.81	−1.72	0.44	0.51
Intake manifold temp. (K)	−0.99	−0.64	0.34	−2.00
Intake manifold press. (bar)	−0.04	−0.24	−0.12	−0.11
Intake manifold mass flow (kg·s^−1)	−0.12	−0.22	0.16	0.67
Exhaust manifold temp. (K)	−1.98	0.27	0.10	2.79
Exhaust manifold press. (bar)	1.28	2.59	2.23	−0.62
Exhaust manifold mass flow (kg s^−1)	−0.16	0.14	−0.09	0.38
NOX emissions (g·k^−1W^−1h^−1)	1.59	−2.43	−1.96	1.98