Faz değişim malzemeli kuyu içi ısı değiştiricisi üzerine sayısal çalışma

This study aims to develop a dynamic numerical model in MATLAB to evaluate the parameters that affect the solar-assisted borehole thermal energy storage unit's performance filled with different materials under variable weather conditions. Moreover, another purpose of the study is to investigate the effect of a thermal energy storage system when it is integrated with a heat pump, which is used for heating purposes in Izmir City, Turkey. In the first stage of the thesis, an in-house model is developed to simulate the solar aided borehole heat storage unit that is run with different backfill materials such as clay, soil, and PCM integrated soil domain. The effects of PCM implementation into the backfill domain decreases the heat diffusion within the backfill domain and provides keeping thermal energy around the pipe. Furthermore, weather conditions such as solar irradiance, ambient air temperature, and wind velocity are the key factors of the solar-assisted borehole thermal energy storage systems. The dynamic model that is developed in the first part of the thesis is extended to integrate a latent heat thermal storage system with a heat pump unit. In this integrated model, the cyclic behavior of the latent heat energy storage unit is simulated under different heat demand profiles. Integrating the latent thermal energy storage system into the heat pump results in an increase in the heat pump performance coefficient between 1.3 and 1.8 times.