| Summary: | 博士 === 國立臺北科技大學 === 機電學院機電科技博士班 === 103 === The primary objective of this study was to propose an innovative approach for collecting the solar thermal energy from the concept of solar chimneys for electricity generation via organic Rankine cycles (ORCs). The advantages of this approach include the use of existing building’s wall, and it also provides the region of energy scarcity for reference. The influences of several critical parameters on the thermal performance and outlet temperature of solar chimneys were investigated by experimental and numerical simulations. The study also proposes some methods to improve the thermal insulation efficiency for concrete wall and experimental modeling. The parameters measured from the experiment were substantially reduced using Taguchi method. In addition, the optimal configurations of the solar chimney was identified, which are high-transmissivity glass, rectangular-tubes absorber plate, tilt angle of 45°, black polished surface of high absorption and low emissivity, and airflow length of 4 m. The results showed that the highest outlet temperature of air and heat collecting efficiency of solar chimneys were approximately 125 °C and 65%, respectively.
In a feasibility analysis of ORC application, the system provides to the buildings with 12 kWh per day of electricity, and the area of the collector required was 44.6 m2. The experimental results indicated that the proposed method is feasible for solar chimney provide acceptable quality and quantity of heat for ORC.
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