Energy and exergy analyses of the Nigerian transportation sector from 1980 to 2010
1 Mechanical Engineering Department, Yaba College of Technology, Yaba, Lagos, 6457, Nigeria
2 Chemical Engineering Department, Obafemi Awolowo University, Ile-Ife, 220005, Nigeria
3 Mechanical Engineering Department, University of Ibadan, Ibadan, 200284, Nigeria
International Journal of Energy and Environmental Engineering 2012, 3:23 doi:10.1186/2251-6832-3-23Published: 18 September 2012
This paper analyses energy utilisation in the transportation sector of Nigeria using exergy methods. The sector is dominated by the road subsector, with a share ranging from 70.65% in 1990 to 97.51% in the year 2005 and a mean of 88.44%. The road subsector is still the most efficient, with energy efficiency values that range from 9.93% in 1990 to 19.19% in 1986. The corresponding exergy values are 9.28% and 17.93%, respectively. Following the road subsector is the aviation subsector with its least energy consumption share of 0.10% in 2005 and biggest share of 26.25% in 1990. The subsector energy efficiency values range from 0.03% in 2005 to 7.35% in 1990, with corresponding exergy values of 0.026% and 6.87%, respectively. The overall mean energy efficiency in the Nigerian transportation sector for the three decades is 17.11%, while the overall mean exergy efficiency is 15.97%. The road subsector performance has been adversely affected by the massive importation of used vehicles into the country.