Arkbom Hailu Asfaw’s research while affiliated with Addis Ababa Science and Technology University and other places

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Publications (2)


Manual Tracking for Solar Parabolic Concentrator – For the Case of Solar Injera Baking, Ethiopia
  • Article

January 2022

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10 Reads

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2 Citations

SSRN Electronic Journal

Arkbom Hailu Asfaw

The efficiency of renewable energy equipment is highly reliant on the mechanism for properly capturing the resource and the equipment's performance. For any solar-powered device tracking mechanism is critical; it must be able to follow the pattern of the sun's path. This research created a manual tracking mechanism for a solar-powered steam injera stove. The design of the tracking mechanism tracks the path of the sun seasonally and daily for 5 h, half in the morning and a half in the afternoon, beginning at solar noon, it tracks the sun's path every 10 min. It investigates the relationship between solar intensity and receiver surface temperature. There were two experimental tests, one with one receiver surface data point and the other with three data points. The correlation coefficient of solar intensity with heat temperature on the receiver surface was r = 0.726 at the first data point. And, for the three points where data was collected for one and a half hours in the afternoon, on three-point of the receiver surface lower points, the correlation of solar intensity and average heat temperate of those three points is r = 0.766. For both of the experiment, the relationship of the solar intensity pattern shows there is a strong positive correlation with the temperature on the surface of the receiver which indicates the manual tracking system move with the proper path of the sun and concentrates the sun on the point receiver of the solar injera stove.


Development and Performance Analysis of Top Lit Updraft: Natural Draft Gasifier Stoves with Various Feed Stocks

January 2021

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196 Reads

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1 Citation

SSRN Electronic Journal

The performance of an Ethiopian-designed and built-in gasifier stove was studied and evaluated. The water boiling test (WBT) findings are reported. This test was conducted in a controlled setting utilizing eucalyptus, bamboo, and sawdust-cow dung briquettes as test feedstocks, in accordance with WBT's 4.2.3 standard process and test manuals. Based on moisture content, the net calorific values of eucalyptus, bamboo, and sawdust-cow dung briquettes were calculated and determined to be 15.77 MJ/kg, 14.70 MJ/kg, and 15.35 MJ/kg, respectively. The efficiency of this stove was calculated utilizing those three feedstocks. As a result, the gasifier stove’s efficiency having eucalyptus, sawdust-cow dung briquette, and bamboo as feedstock were 32.30 + 0.3%, 31.5+ 0.5%, and 26.25 + 0.25%, respectively. This proportion did not include the ultimate charcoal production, but when this yield was employed as an energy input for additional charcoal burners, it increased to 53 + 2%. The relationship between gasifier stove charcoal production and total efficiency is negatively related, with a linear equation of Y= - 0.7956X+ 22.766 and an R- a squared value of 0.92. When compared to local stoves and foreign gasifier stoves, whose efficiency is in the range of 10 % to 39% this efficiency rating was exceptional due to the fact that the space between the internal and external cylinder helps the secondary air to preheat before combustion and also the interior hollow cylinder help the primary air to move evenly in the vertical circular pattern for proper gasification, it will also help the gases that are produced during gasification process to move to the top part for combustion, indicating that this study can be fostered for prospective use. Keywords Performance Analysis of Gasifier StoveWBT (Water Boiling Test)Different feed Stock

Citations (1)


... A detailed manual tracking mechanism design and construction for this research was published in a paper titled "Manual tracking for solar parabolic concentrator -For the case of solar injera baking, Ethiopia." [19]. The following formulas were used to calculate daily and monthly tracking. ...

Reference:

Design and development of solar parabolic concentrator, closed-loop pressurized hot water for a household baking system – For the case of injera baking in Ethiopia
Manual Tracking for Solar Parabolic Concentrator – For the Case of Solar Injera Baking, Ethiopia
  • Citing Article
  • January 2022

SSRN Electronic Journal