Abebayehu Assefa (PhD)Tsegaye Seyoum2024-09-032024-09-032011-01https://etd.aau.edu.et/handle/123456789/3458In this study, the transient performance of direct open-loop circulation active solar water heating system is computed using TRNSYS modeling and simulation software for flat-plate collector from the input of average annual climatic data of Addis Ababa and collector parameters. Typical daily hot water consumption for about 1000 students of Addis Ababa University, Technology Faculty was considered. The hot-water demand temperature (60 °C) is controlled by a conventional electrical/fuel auxiliary heater. The thesis focuses on simulation of solar water heating system and its economic analysis. The various design parameters are taken from the manufacturers and dealer companies of solar water heaters in Ethiopia and also from the world experience. The meteorological data for simulation was taken from SEWERA website found in a text and TMY format. The TRNSYS modeling and simulation are used to determine the outlet temperature of the solar collector and the daily contribution of the solar and the auxiliary heating system to the heating load. From the annual contribution of solar energy to the heating load and the estimated investment cost, the payback period of the heating system using two backup systems (i.e. fossil fuel or electricity auxiliary heating) was compared. The results obtained indicate that the payback period of the solar water heating system using furnace oil as backup heater is less than that of electricity, almost by half.en-USTRNSYSSolar Water HeatingSimulationThesis