Zewude Hirpesa

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I am Received my BSc in Mechanical Engineering from Madda Walabu university in 2018. and my MSc. from Dire Dawa university by Production Engineering and management Currently I am working as lecturer at Madda Walabu university under Department of Mechanical engineering

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Journal of Future Sustainability

Municipal solid waste management strategy selection: Multi-criteria decision making under uncertainty, 2024

For decades, due to the increasing generation of waste and its negative environmental impacts, ef... more For decades, due to the increasing generation of waste and its negative environmental impacts, efficient municipal solid waste management (MSWM) has become a major concern of sustainable development. On the other hand, selecting an appropriate strategy remains a critical issue for municipal authorities without applying a multi-criteria decision-making (MCDM) approach. This study aims to select the best MSWM strategy from five potential MSW management strategies under various factors that influence waste strategy selection, such as economic, social, technical, and environmental factors. This study used three fuzzy integrated MCDM methods, namely the Decision-Making Trail and Evaluation Laboratory (DMATEL), the Analytic Network Process (ANP) and the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) to select best MSWM strategies. The study used data from a survey of experts who had knowledge of waste management. The survey data was then analyzed using the DMATEL, ANP and TOPSIS methods under a fuzzy environment. The Fuzzy DEMATEL method is used to identify the causal relationships among the criteria and sub-criteria, while ANP is applied to determine the relative weights of MSWM strategy selection sub-criterion. Finally, TOPSIS is used to rank the waste management strategies depending on established sub-criteria. The result of fuzzy TOPSIS demonstrated that recycling of municipal solid waste is the best alternative which has the highest closeness coefficient followed by reuse. Thus, the result of this study revealed that MSWM strategies are ranked as: waste recycling (A1), reuse (A2), reduce (A1), energy recovery (A4), and disposal (A5), with closeness coefficient values of 0.80, 0.61, 0.60, 0.47, and 0.17, respectively.

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Design and Construction of Indirect Solar Coffee Dryer

International Journal of Innovative Technology and Exploring Engineering, 2020

Drying is the process of removing moisture contents from solid. Solar drying refers to a techniqu... more Drying is the process of removing moisture contents from solid. Solar drying refers to a technique that utilizes incident solar radiation to convert it into thermal energy required for drying purposes. This project presents the design, construction and performance of an indirect type solar dryer for coffee product. In the dryer the air inters into the solar collector from the atmosphere through air inlet hole. This air will be heated in the collector and then pass to the drying chamber through the hole. Then the air exhausts through the outlet hole at the top of the drying chamber. The system designed can handle a capacity of up to 50kg of wet coffee per m2at a depth of 100 mm. The average sunshine at Bale Robe was found to be 12 hours per day. The daily solar insolation at the site was found to be 5.86kW/m2 of surface per day. By utilizing the solar collector in question and assuming a collector efficiency of 20 %, the total solar energy received is 5.86 kW-hrs/m2/day or 46.88 kW-h...

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Journal of Future Sustainability

Municipal solid waste management strategy selection: Multi-criteria decision making under uncertainty, 2024

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Design and Construction of Indirect Solar Coffee Dryer

International Journal of Innovative Technology and Exploring Engineering, 2020

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Zewude Hirpesa

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Papers by Zewude Hirpesa

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