Effect of Ethanol Content on Thermal Efficiency of a Spark-Ignition Light-Duty Engine

Table 2

Gasoline, ethanol, and tested blends main characteristics.

	A/F	LHV	ρ	Ethanol	C	H	O	gCO2/MJ	𝐻^ast,mix	𝐻𝑣^b
	kg/kg	MJ/kg	kg/m^3	% mass	% mass	% mass	% mass	g/MJ	MJ/kg	kJ/kg
Gasoline	14.32	42.5	750	0	85	13	1	73.4	2.77	400
E10	13.77	40.9	754	10	82	13	5	73.3	2.77	—
E20	13.22	39.3	757	20	78	13	8	73.1	2.76	—
E30	12.68	37.7	761	30	75	13	12	72.9	2.75	—
E85	9.77	29.2	780	85	57	13	30	71.5	2.71	—
Ethanol	9.01	26.9	785	100	52	13	35	71.0	2.69	850

^aHeat content of stoichiometric mixture.
^bLatent heat of vaporization.