Browsing by Author "Mengesha, Alemu"

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    Design and CFD Analysis of Thermal Energy Storage Using Pcm for Cooking Application
    (Addis Ababa University, 2020-06) Mengesha, Alemu; Demiss, Alemu (PhD)
    Nowadays there is a serious need for the development of the alternative, appropriate, cheap method of energy use of cooking. In Ethiopia, the majority of the population depends on biomass for cooking applications. However, to avoid this drawback, alternative energy is needed. Hence,the overall purpose of this paper deals with the design and analysis of thermal energy storage using solar salt combnation of 60%NaNO3 and 40%KNO so as to avoid enrgy demand and supply problem. It provides a high energy storage density at a constant temperature which corresponds to the phase transition of phase change material (PCM). At the time of energy available from the solar source, a PCM energy storage technology is selected and designed which will be used for later cooking application.The basic design of the study was using steel materials as a tank (shell) for thermal energy sorage, copper tube encapsulated with PCM material. Heat transfer fluid(air) was selected for the model. In addition, two-dimensional Governing equations like continuity, momentum, and energy were discretized by using the finite volume method (FVM). Thus, all the transient 2D numerical simulations during the charging and discharging process were carried out using the commercial software CFDANSYS Fluent 17.2.As a result,a charging efficiency (70.1%) and discharging efficiency(36.9 %) was obtaind during simulation of thermal energy storage unit by using different mass flow rate. It was observed that the energy stored during charging (30096.47 KJ) and the discharged energy(83454.83KJ) were possibliy used for cooking.This energies were found to be a suitablel design for an indoor cooking application.