Browsing by Author "Fikadu, Geremu"

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    Modeling of Small-scale Solar Absorption Refrigeration System Used in Dairying Process
    (Addis Ababa University, 2017-10) Fikadu, Geremu; Demiss, Alemu (PhD)
    Dairy and milk are an important sub-sector in the national economies of many developing countries, providing food, regular incomes for households and sustainable livelihoods for rural farmers and small and microenterprises. Milk constitutes an important part of a balanced and healthy diet with its excellent nutritional properties. When we use milk direct for nutrition purpose it would affect human health, Refrigeration is crucial important to cool milk. Refrigeration and air conditioning consumes about 15% of world energy today, solar energy is one of the most efficient, clean and affordable energy alternatives available now a days and current concerns about global warming and ever-increasing energy rates. Absorption refrigeration system needs a low running cost on cheap fuel such as solar energy, biomass and waste heat while vapour compression refrigeration system need high cost due to electricity as energy input. Absorption refrigeration has been most frequently adopted for solar refrigeration and reducing the emission of greenhouse gases. To remove harmful bacteria that would affect human health, some processing is required. In rural area where electric grid is unavailable some of milk is wasted as bulky when they use traditional ways and they wouldn’t pasteurize milk. To overcome such a problem pasteurizing and refrigeration of milk using solar energy is the important things. Solar absorption refrigeration system has the potential to improve the life quality for people who lives in remote areas or areas with insufficient electricity, with the objective of modeling small scale solar absorption Refrigeration system for dairying process for pastoralists of Afar region with capacity of 500 liters. The modeling of solar absorption refrigeration system used in dairying process is done, by using mathematical model and dynamic modeling of the system, using MATLAB software. The coefficient performance of the solar absorption refrigeration system varies from 0.45 to 0.94and milk temperature is cooled from 32 c using MATLAB simulation. the data used for modeling is gained from Chuye milk and milk processing, A two electromechanical companies and National metrology agency. The life cycle cost of solar absorption refrigeration system is calculated, the life cycle cost of solar absorption refrigeration is much less than that of vapour compression refrigeration system used in chuye milk and milk processing company. The project is economical feasible.