A COMPARATIVE ANALYSIS OF ENERGY AUDIT OF LADOKE AKINTOLA UNIVERSITY OF TECHNOLOGY, OGBOMOSO, OYO STATE AND UNIVERSITY OF ILORIN, ILORIN, NIGERIA

Abstract

Energy audit deals with the way of checking the way of checking energy usage and identification of how wastage can be minimized if not totally eradicated. Energy audit consists of several tasks which can be carried out depending on the type of audit and the function of audited facility. It started with review of the historical data of energy consumption which can be compiled from the electricity bills. This paper presents a comparative analysis of energy audit of Ladoke Akintola University of Technology,(LAUTECH), Ogbomoso, Nigeria and University of Ilorin,(UNILORIN), Nigeria..

A number of offices were visited in six faculties – Faculty of Engineering, faculty of Management Sciences, Faculty of Agricultural Sciences, Faculty of Environmental Sciences, Faculty of Pure and Applied Sciences and Faculty of Medical Sciences of the two universities in order to take the statistics of different electrical appliances-fans, air-conditioners ,television sets, refrigerators, printers and computer systems used and to carry out a lightning use analysis .Ratings of the electrical appliances were also recorded as well as the load connected to the equipment. The total annual energy cost was computed when T12 tube light and CFL was used. When these were replaced with T5 tube light and LED respectively, total annual energy cost was also computed for the two universities used as case studies in this research paper. Normal fans were also replaced with energy efficient fans, window ACs were equally replaced with split units while the total annual energy cost and the total cost savings were computed in each case for the two universities.

The results of the research paper shows that for LAUTECH, Ogbomoso, the total annual energy cost before and after replacing T12 tube light with T5 tube light were #177,986.16 and #124,589.52 which gave an annual cost saving of #53,396.64. In addition, before and after the replacement of CFL with LED, the total annual energy cost savings were #423,015.12 and #166,120.42 respectively giving an annual cost saving of #256,894.7. When normal fans were not replaced with energy efficient fans, the total annual energy cost was #1,762,068 and the total annual energy cost reduced to 31,409,654.4 when the replacement was done.  In this case, the annual cost saving was #352,413.6.  A total annual energy cost of #24,324,775.2 was obtained before replacing window AC with split units. After the replacement, the total annual energy cost reduced to #18,243,582.72 which translated to an annual cost saving of #6,081,192.5.

For UNILORIN, before and after the replacement of T12 tube light with T5 tube light, the total annual energy costs were #223,076.04 and 3156,153.36 respectively with an annual cost saving of #66,922.68.

Replacement of CFL with LED gave a total annual energy cost of #173,595.84 compared to a total annual energy cost of #446,416.08 before the replacement. This eventually translated to an annual cost saving of #272,820.24. The total annual energy cost before and after replacing normal fans with energy efficient fans were1,846,606.08 and #1,447,285.92 respectively which translated to an annual cost saving of #8,750,986.2 for UNILORIN. Replacement of window AC with split units gave a total annual energy cost of #26,252,958.6 compared to a total annual energy cost of #35,003,944.8 before the replacement. A total annual cost saving of #8,750,986.2 was obtained.

For LAUTECH, a total annual cost saving of #53,396.64 was obtained when T12 tube light was replaced with T5 tube light while it was #66,922.68 for UNILORIN which might be due to the size of UNILORIN compared to LAUTECH. By replacing the CFL with LED, the annual cost saving for LAUTECH and UNILORIN   were #256,894.7 and #272,820.24 respectively due to the power requirements of UNILORIN compared to LAUTECH.. By replacing normal fans with energy efficient fans, the annual cost savings for LAUTECH and UNILORIN were #352,413.6 and #369,320.16 respectively suggesting that a much annual cost was saved in UNILORIN due to the power requirements of the university. When window ACs were replaced with split units, the annual cost savings for LAUTECH and UNILORIN were #6,081,192.5 and #8,750,986.2 respectively translating to a total annual cost saving of #6,743,897.44 and 39,460,049.28 for LAUTECH and UNILORIN respectively as well.

Keywords: Energy audit, LAUTECH, UNILORIN, Tube light, CFL, LED, Energy efficient fans, Split units.