Investigation Of Parabolic Dish Solar Concentrator For Local Areke Distillation

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Areke is Ethiopian’s locally produced traditional fermented alcoholic liquor which is producedrnfrom difedif- mixture of milled gesho (Rhamnus Prinoides), finely ground and cooked/bakedrncereals, and water left for fermentation for nine to ten days, by the of process distillation.rnThe heat required for the distillation process is obtained from burning firewood on inefficientrnthree stone stoves. Energy inefficiency, greenhouse gas emission to the environment, humanrnrespiratory system diseases and deteriorating household economy are the major negative impactsrnthat resulted from using biomass as energy source for local areke distillation.rnThis thesis work presents the design and manufacturing of parabolic dish solar collector systemrnfor local areke distillation process as a substitute energy source instead of burning biomass andrnreports the test results of the system. In order to show design procedure; parabolic dish solarrncollector system with aperture diameter of 1.6m, depth of 0.4m and focal length of 0.4m wasrndesigned in full scale. The parabolic dish is designed for distillation of 24 liters of difedif tornobtain 3 liters of areke with alcohol content of 44% per day (i.e. from 8:00AM to 5:00PM). Onerncycle of distillation takes on average 3 hours to obtain 1 liter of areke from 8 liters of difedif.rnHowever, the parabolic dish frame of aperture diameter of 1.2m, depth of 0.3m and focal lengthrnof 0.3m, which already exists in AAIT Mechanical workshop, with a little maintenance andrnmodification was used for the test purpose. Aluminum foil laminated galvanized sheet is used asrnreflective surface for dish concentrator. The parabolic dish tracks the sun ray manually based onrnthe shadow of pin on the edge of dish aperture. Especially made clay pot with capacity of 4 liters,rnand having effective surface area of 0.071m2 was used as absorber. 2.5 liters of difedif was usedrnto conduct the test in three different days.rnThe test result showed it was possible to obtain from 2.5 liters of difedif 0.25liters of areke withrnalcohol content of 44% and on the average it took 3 hours. And on average it took 1 hour andrn15minutes to reach temperature of 70.4oC which is the boiling point temperature of alcohol inrnAddis Ababa at atmospheric pressure of 0.746atm, where the test was conducted. So, withrnappropriate design of solar energy distiller system for local areke distillation as an alternativernsource of energy showed promising results and has the potential to mitigate the negative impactsrnrelated to traditional areke distillation method.

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Investigation Of Parabolic Dish Solar Concentrator For Local Areke Distillation

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