Browsing by Author "Samuel, Kelbesa"

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    Design, Simulation, Manufacturing and Testing of Forced Draft Microgasifier
    (Addis Ababa University, 2020-12) Samuel, Kelbesa; Kamil, Dino (PhD)
    This research has been carried out to develop a forced draft microgasifier cookstove from locally available materials. To achieve the objective of the research, an Analytical method was used for designing different parts of the gasifier. SOLID WORK 2020 was used to model various geometries of the microgasifier stove and COMSOL Multiphysics 5.5 was used for CFD analysis of the cookstove to analyze the thermal behavior of the stove and, International Standards Organizations ISO 19867-1:2018 guideline was used for testing the performance of a forced draft microgasifier stove. Finally, by using surface temperature measured during the experiment, the contribution of each mode of heat transfer was calculated. The developed forced draft microgasifier cookstove has a combustion chamber diameter of 200mm and height of 260mm. In order to minimize the heat loss from the combustion chamber to the stoves outside body the combustion chamber of the stove was covered with clay of 20mm thickness. Also the gap between the insulation clay and the outside cylinder of the stove was 20mm and it used for secondary air supply as well as used as additional insulator. The air was supplied with the help of 12V, 92mm computer fan. The fan supply air at the speed of 5m/s. The CFD result shows the effects of pot support height on the thermal efficiency of the stove and the study found that a lower pot support height has high thermal efficiency than the higher ones. The result of CFD was compared and valiodated with the experimental data. From the result obtained, the thermal efficiency of CFD, Experiment, and heat transfer analysis was 49.72, 44.70, and 40.12% respectively. The specific fuel consumption of the developed stove was 56g/liter. Generally, the developed forced draft microgasifier stove provides better performance when compared to the previous design proposed by other researchers. Thus disseminating the developed microgasifier stove at a larger scale in developing countries like Ethiopia will be beneficial in reducing deforestation and emission that will be brought about by using open-fire stoves and thus, helps to obtain carbon credit.