* Akademik Arşiv / Academic Archive

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Experimental analysis of energy storage performance of phase change materials in horizontal double-glazing applications
(2023) ALİ ÇELİK
In this study, phase change material (PCM) energy storage performance was experimentally investigated for horizontal double-glazing applications. In this context, it was aimed to use PCM for energy storage in horizontal insulating glass applications, and optimize amount of PCM in the glass and the effect of the surface area it occupies on the indoor light level were analyzed. In this regard, the temperature variation in the glass with the amount of PCM was observed and the optimum amount of PCM was evaluated. The experiments were carried out on an insulated test cabin using double-glazed test elements with different PCM ratios as 0 %, 15 %, 30 %, 45 %, and 100 %. An external light source was used to create constant radiation conditions during the experiments and temperature measurements, thermal camera images, as well as light intensity measurements were taken in the test cabin. The results revealed that the increase in the energy storage capacity with the amount of PCM is limited, while the light transmittance decreases continuously due to the solid PCM shading. In other words, as the amount of used PCM increases, the energy storage capacity increases and thermal comfort conditions improve. However, this increase stopped at a certain point and a constant trend was observed. It was concluded that, this situation occurs due to the blocking of the radiation entering the indoor environment and the decrease in the radiation intensity. For the 30 % area ratio, the cooling period was extended by 450 min compared to the reference case, and longer thermal comfort conditions were provided.
Study on a novel inclined solar water distillation system using thermoelectric module for condensation
(2023) ALİ ÇELİK
Energy efficiency and energy conservation are critical issues today, and the use of solar energy is widely recognized as a key solution for achieving energy independence and reducing reliance on fossil fuels. In this study, a water treatment system was installed, and numerous experiments were conducted to improve energy efficiency and investigate the impact of various parameters on water distillation rates. The primary focus of this study was to increase the rate of distillation by enhancing the surface area for rapid evaporation through the use of sponge pieces, and integrating the system with a novel condensation part equipped with a mechanism that sprays water on the external heat exchanger of the thermoelectric module to increase the condensation rate. The study also examined the effects of black color on solar energy absorption, the impact of indoor fan operation on water vapor distribution, the role of insulation in reducing thermal energy losses, and the intensity of solar radiation. The results revealed that the use of sponge pieces and a thermoelectric cooler significantly increased the rate of water distillation, which was about 100.5%. Moreover, the effect of air fans on the distillation rate was observed, which increased the distillation by more than 51.1%. Overall, this study provides valuable insights into the design and optimization of solar-powered water treatment systems, highlighting the importance of energy efficiency and the potential of renewable energy sources in meeting energy needs while reducing impact on the environment.