This paper presents energy and exergy analyses as a useful concept
in analysing true efficient energy utilisation of the Nigerian residential sector
by considering energy and exergy flows in this sector for a period of 15 years
from 1991 to 2005. The energy and exergy flows considered include the
commercial and the ‘non-commercial’ energy sources. The most efficiently
utilised energy source appears to be the Liquefied Petroleum Gas and the least
efficient, kerosene. Electricity utilisation exergy efficiency has been adversely
affected by the vapour-compression air-conditioning application apart from low
potential thermal energy applications. The overall utilisation energy and exergy
efficiencies have been found to be 19.89% and 4.38%, respectively.