Browsing by Author "Anurangi, W.A.J."

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    Development of Specific National Energy Benchmark Model for Sri Lankan Apparel Industries
    (Uva Wellassa University of Sri Lanka, 2018) Anurangi, W.A.J.; Wijesekara, K.B.
    The development of specific national energy benchmark model for apparel industries is a fundamental requirement for efficient assessment and monitoring of energy consumption of the Sri Lankan apparel sector. Thus, this model could be used as a base for the energy labelling and energy star programs, which would be implemented for the apparel sector in the near future. In the context of this study focuses on analysing the energy consumption data of significant number of reference apparel industries have been analysed in order to construct a relationship between the energy consumption and the significant factors, which would affect to the final energy consumption. The total energy consumption of the apparel sector does not only depend on its total production (output) and/or operating hours, but also several other factors such as age of the building or factory, the outside weather conditions, number of floors, occupants' behaviour, general maintenance, etc. The mostly used simple benchmarking method, which is normalized by means of the total production and/or operating hours, is not adequate in the process of effective recognition of the energy efficient apparel industries. Hence, the regression model developed with the above explanatory factors is necessary for identifying the energy performance. The final model developed with the above explanatory factors facilitates to determine whether an apparel industry uses energy more efficiently than other similar industries. And also the model could be used to encourage the poor energy performers in the apparel sector to improve their efficiency. Keywords: Energy benchmark, Energy efficiency, Apparel industry
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    Life Cycle Energy Assessment for Domestic Biogas Systems
    (Uva Wellassa University of Sri Lanka, 2020) Jayapala, J.M.G.D.; Anurangi, W.A.J.; de Alwis, A.A.P.
    With the rapid economic development and urbanization, Sri Lanka is facing a huge challenge in terms of energy security and environmental pollution due to the drastic increase in burning fossil fuels. Therefore, it is important to explore the potential of renewable energy sources for domestic and industrial consumption. Biogas is one of the best solutions for these issues as it provides triple benefits namely sustainable environmental protection, energy generation, and agricultural & farming support. However, to further development of biogas energy technologies in Sri Lanka, it is important to do a detailed energy analysis of this technology by considering the initial energy requirements and energy generation at the end. The life cycle energy assessment (LCEA) can be used for this analysis and can be used as a basis for the calculation of energy pay-back time (EPBT). This analysis includes the energy requirements during the collection and transportation of waste, construction, and operation of the plant, upgrading the biogas produced and final energy generation from the biogas. In this study, different sizes such as 8, 10, 12, 15, 22, 35, and 65 m3 of Chinese fixed dome type biogas plants were analysed using LCEA to determine the EPBT. Embedded Energy Values (EEVs) were evaluated from the quantity of materials used for the construction of different sizes of biogas plants and EPBT of the plants were calculated using EEVs and final biogas energy production. As per the analysis, the relationship of EPBT and the volume (in m3 ) of the biogas plant (X) was EPBT= 0.0006 X2 - 0.008 X + 0.590. Accordingly, the construction of the higher capacity plant has lower EPBT and therefore it is more energy-efficient than a smaller capacity plant. However, a detailed economic analysis is required to carry out when selecting the optimum size of the biogas plants. Keywords: Biogas plant, Life cycle energy assessment, Embedded energy values, Energy pay-back time