Ranking Renewable and Fossil Fuels on Global Warming Potential Using Respiratory Quotient Concept

Table 6

RQ values for pure gasoline, pure ethanol, and for 85 : 15 (vol%) gasoline: ethanol blend. Blend: volume%, gasoline: 85 and ethanol: 15; mass%, gasoline: 84.6 and ethanol: 15.4; heat%, gasoline: 90 and ethanol: 10; ; ; ; CO₂ in tons per .

Fuel	Pure gasoline	Pure ethanol	(85 : 15) blend
Formula (empirical formula)	C8H18(CH2.25)	C2H5OH; (CH3O0.5)
Density (kg/m^3)	750	785	785
HHV (kJ/kg)	48500	29700
CALCULATED
C normalized empirical formula	CH2.25	CH3O0.5	CH2.33O0.051
Molecular weight-empirical	14.283	23.04	15.182
HHV, kJ/kg	-	-	45569
(stoichiometric O2 moles/empirical mole)	1.563	1.5	1.556
St O2 kg/kg fuel	3.501	2.083	3.28
, kJ/kg O2	13854	14256	13894
	0.640	0.667	0.643
	-	-	0.652
(ethanol being carbon neutral)	-	-	0.584