Demiss, Alemu (PhD)Derese, Degefa2019-05-312023-11-182019-05-312023-11-182018-10http://etd.aau.edu.et/handle/12345678/18369In this paper, milk pasteurization system was developed by utilizing solar energy for off grid peri urban milk producers of Kombolcha as having warm climate condition. While, milk is perishable foodstuff and easily spoilage but milk producers in area are not used any milk preservation system. Thus, this study aim to study performance analysis of solar energy of the location for small-scale milk pasteurization with coil heat exchanger fully immersed into the milk storage tank. The simulation of the studied model analysis was done with a MATLAB code and the performance of the milk pasteurization system was predicted. The system uses 2.11 m2 gross area of an Evacuated tube solar collector and the solar radiation intensity on inclined surface of the location obtained was about 480 W/m2 to 920 W/m2 with glass temperature of 25 0C to 36.2 0C. The average monthly useful energy gained by the collector was 780 Wh to 1500 Wh and the maximum hot water temperature exit from collector was between 80 0C to 83.42 0C using water as heat transfer fluid at the solar noon for each month of the year. After energy loss to the ambient, the hot water temperature in the thermal storage tank or inlet to the coil heat exchanger was about 69.0 0C to 78.2 0C. Moreover, the pasteurized milk temperature found to be 65.0 0C to 69.20C. Overall results indicate that, solar based milk pasteurization system was viable technology in this manner and it achieved the acceptable milk temperature range being heated to destroy microorganisms that leads milk spoilage.en-USMATLABPasteurizationCoil heat exchangerThermal StorageThesis