Performance evaluation of lighting retrofitting in lecture halls of Obafemi Awolowo University, Ile-Ife, Nigeria.
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Date
2021
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Department of building, Faculty of environmental design and management, Obafemi Awolowo University.
Abstract
This study examined the lighting energy consumption pattern of the existing fluorescent lamps; assessed the impact of retrofitting using compact fluorescent lamps (CFLs) and light emitting diode (LED) lamps on the consumption pattern; determined the payback period on investment made when retrofitting lighting with the two energy efficient lamps. These were with a view to providing information on the potential benefit of retrofitting lighting systems with energy efficient lamps in selected lecture halls in Obafemi Awolowo University, IleIfe. Data for this research work were obtained using quantitative approach by carrying out simulation on three selected lecture halls which was based on purposive sampling techniques. An energy monitor was used for the measurement of energy consumption at periodic logins of 1hr, 3hrs, 6hrs, 12hrs, 1day, 7days, 1 month and 3 months. Data collected were presented and analysed using frequency distributions, Mann-Whitney and Bartlett’s test, Pearsons’ correlation, simple percentages and standard payback equations
The results showed that the energy consumption values of existing fluorescent lamp across the simulated Agriculture Lecture Theatre, Oduduwa Lecture Theatre and Science Lecture Theatre increased consistently based on the numbers of lighting points. The values increased from 0.3211 to 681.576 (ATL), 0.7600 to 1619.4600 (ODLT) and 2.6262 to 5652.4321 (SLT) in 1 hour to 3 months, respectively. The comparative analysis of the energy consumption of the three lamps showed that retrofitting fluorescent lamp with compact fluorescent lamp and light emitting diode lamp reduced energy consumption from 229.096 to 129.101 and 96.396 in 1 month; from 681.576 to 387.302 and 274.188 in 3 months (ATL); from 531.130 to 216.243 and 142.536 in 1 month; from 1619.466 to 692.479 and 426.608 in 3 months (ODLT); from 1840.846 to 657.243 and 500.167 in 1 month; from 5652.432 to 1936.600 and 1499.015 (SLT) in 3 months respectively. The findings also revealed that a wide margin exists between the energy consumption of existing fluorescent lamp with that of compact fluorescent lamp and light emitting diode lamp but a very small margin exists
between compact fluorescent lamp and light emitting diode lamp. The percentage energy savings across the three lecture halls also showed that there were significant differences between the electricity consumption before and after simulation of the as-built lamps with 43, 47 and 65% reduction in electricity consumption using compact fluorescent lamp and 57, 73 and 73% using light emitting diode lamp. The Pearsons’ correlation values across the three selected lecture halls were also found to be 1.000, which indicates a very strong positive correlation. The 2-tailed significant value of p < 0.05, which implies that the correlation is highly significant. The results of the retrofits payback period also showed that the compact fluorescent lamp performed better in the return of retrofits investments having a payback period of 7 months, 4 months and 5 months than that of the light emitting diode lamp having a higher payback period of 10 months, 6 months, and 8 months respectively across the three lecture halls. The study concluded that replacing fluorescent lamp with compact fluorescent lamp and light emitting diode lamp would be a feasible option in order to enhance optimal performance of the lecture halls, but in terms of viability, it would be beneficial to retrofit fluorescent lamp with compact fluorescent lamp.
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Adeleke, J.S. (2021). Performance evaluation of lighting retrofitting in lecture halls of Obafemi Awolowo University, Ile-Ife, Nigeria. Department of building, Faculty of environmental design and management, Obafemi Awolowo University.