Abstract—The effect of change of ambient temperature on
energy demand for cooling or heating can be estimated using
degree days. In this work, cooling degree days were computed
from hourly dry bulb temperature data of eighteen locations
spread over the six geopolitical zones in Nigeria. The raw
hourly dry bulb temperature data which were obtained from
Nigerian Meteorological Agency (NiMet), Oshodi, Lagos for
fifteen years of either 1994 -2008 or 1995 – 2009, were digitized
and then analysed to obtain cooling degree days using the
following base temperatures: 22, 24, 25, 26, 28, 29 and 30°C.
The minimum and maximum annual cooling degree days for all
base temperatures were obtained for Jos and Sokoto,
respectively. For a base temperature of 22°C, the annual cooling
degree days obtained ranged between 18.18 and 2429°C-day.
Fourteen out of eighteen locations had their highest monthly
cooling degree days in March, three other locations had theirs
in May and only one has its own highest in April. The lowest
monthly cooling degree days were obtained in August for all the
locations. The results obtained in this work are useful for
energy management in Nigeria and it may also be useful in
other countries with cities having similar climate to the
locations considered in this work.
Index Terms—Base temperature, cooling degree days, dry
bulb temperature, energy management.
The authors are with the Department of Mechanical Engineering, the
Federal Polytechnic, Ilaro, Ogun State, Nigeria (e-mail: lekanoba@
yahoo.com, adeolorunmaiye@gmail.com).
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Cite:O. O. Awolola and J. A. Olorunmaiye, "Cooling Degree Days for Estimating Energy Consumption in Air Conditioning Systems in Nigeria," Journal of Clean Energy Technologies vol. 8, no. 1, pp. 5-10, 2020.
