Güneş destekli ısıl enerji depolama sistemlerinin sayısal incelenmesi

Due to the intermittent nature of solar energy and the mismatch between the instantaneous demand and supply, solar energy could not be used effectively or continuously in solar-assisted applications such as heating a building. As a common approach, it is possible to store the available solar energy when it is abundant and use it later to operate solar-assisted applications sustainably. Thermal energy storage (TES) applications provide critical solutions for ensuring the sustainability of solar energy. This dissertation focuses on numerically evaluating the performance indicators of the sensible and latent heat packed-bed TES tanks under various working and design parameters. An in-house transient mathematical model is developed, which consists of a flat plate solar collector, TES tank, and heat pump to simulate the TES systems' heat transfer phenomena under variable weather conditions for the heating season months of Izmir City, Turkey. The heat transfer characteristics and the second law aspect of the TES tank are examined to provide a thorough understanding. The integrated TES systems' optimum design parameters and working conditions are proposed for heating season months (November, December, January, and February). Consequently, it is observed that increasing the mass flow rate of the heat transfer fluid and decreasing storage material diameter enhances system indicators. Moreover, comparative results reveal that a well-designed TES tank integrated with a heat pump unit could have up to 48% higher COP values and provide 30% less energy consumption when it is compared with the traditional air-source heat pump.