Browsing by Author "Mesfin, Debebe"

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    Biogas System Planning for Rural Households Based on Energy Demand (The Case of Holeta District)
    (Addis Ababa University, 2017) Mesfin, Debebe; Abubeker, Yimam (PhD)
    This research is conducted to study the energy consumption trend and to make easy of planning the biogas system design which can helps to meet the energy demand of the rural households found in Holeta district. The energy demand of the households is assessed based on the questionnaire paper. The information of the assessed households is collected randomly from different family sizes that live in “Geda Jogo” and “Ada odo” Villages. Households are using electricity mostly for lighting purpose. Fire wood, Charcoal and dung cake are the main sources of energy to meet the cooking Energy demand. The average amount of annual fertilizer consumption by the peasant households is 220 kg. Spreadsheet modeling tool is prepared and it is used to estimate Households biogas demand, gas production potential of the households and Digester volume including the expected Loading rate. It is also used to forecast the basics of Economical aspects which should be known before the plant is designed. To crosscheck the proper functionality of the spreadsheet modeling tool Manual calculations has been performed for the average and peak values observed in the surveyed households and compared with the values found from the spreadsheet model. For the average values, the Biogas demand, the gas generating potential of the Households and digester volume observed in the spreadsheet calculation tool are 6.001m 3 /day, 6.8 m 3 / day and 20.3949 m 3 respectively. The values gained using manual calculations are 6.114m 3 /day, 6.8m 3 /day and 20.4 m i 3 . For the peak values calculation in spreadsheet modeling tool, the Biogas demand, the gas generating potential of the Households and the digester volume needed are 9.19m 3 /day, 8.8 m 3 / day and 26.3934 m 3 respectively. Where as in the manual calculation the values are 9.16 m 3 /day, and the digester volume is . Priority rank on the households energy demand has been performed, so that it will help on the biogas system design. The economical aspect of the biogas system is also included and how the households could be benefited using this technology. The estimated cost to construct the plant for the average values are ETB 29,840 with a payback period of 3 years. The cost spent to buy chemical fertilizer could be saved. Finally the benefit cost ratio is calculated to be 1.44 which is greater than 1.