Journal of Building Performance ISSN: 2180-2106 Volume 10 Issue 1 2019 http://spaj.ukm.my/jsb/index.php/jbp/index Universiti Kebangsaan Malaysia The Royal Institution of Surveyors Malaysia Page 17 ENERGY EFFICIENCY MEASURES ON TWO DIFFERENT COMMERCIAL BUILDINGS IN MALAYSIA Nor Azuana Ramli, Mohd Fairuz Abd Hamid, Harison Gimang Anak Richard* Department of Electrical Engineering, Universiti Kuala Lumpur British Malaysian Institute, MALAYSIA. *Corresponding author: norazuana@unikl.edu.my Abstract Buildings consume almost the highest energy in Malaysia, and the highest energy consumption comes from electricity. In order to reduce energy consumption in the commercial buildings, energy efficiency measures need to be done based on factors that affect energy consumption in the building. In this paper, the energy consumption of two commercial buildings are taken as a case study, and a number of energy cost saving measures were proposed based on the energy audit. The primary objective of this study is to obtain the minimum years of return of investment for two different commercial buildings through energy efficiency measures. In this case study, energy prediction is added and its results are used to determine how much saving could be obtained. The methodology used for prediction of energy consumption is autoregressive integrated moving average, and its performance was compared with linear regression and artificial neural network. The results showed that the most accurate method with the highest cost saving is autoregressive integrated moving average. Finally, building energy index was calculated, and the results showed that the minimum years of return on investment is two years if the investment is RM 499,539. For future work, other factors such as the number of equipment should be included in the prediction analysis to obtain more accurate results. Keywords: ARIMA; artificial neural network; building energy index; Energy Cost Saving Measures; energy prediction. Article history: Submitted: 11/02/2018; Revised: 10/05/2018; Accepted: 02/07/2018; Online: 01/02/2019 INTRODUCTION The increment rate of gross domestic product (GDP) and electricity consumption had been consistent until the mid-1990s where Malaysia experience a slump in GDP, but the electricity consumption continued to increase until now. Increasing of electricity consumption would bring negative impact to the environment where carbon dioxide emissions would increase excessively. Figure 1 shows the increase of carbon emissions per capita in Malaysia compared to other two ASEAN countries. The carbon emissions in Malaysia is the highest compared to Thailand and Indonesia. Figure 1: Carbon emissions per capita for Malaysia compared to Indonesia and Thailand (Source: World data)