Assessment the Performance Enhancement by Using Ribbed Absorber Plates Inside a Solar Chimney

Abstract

The world's tendency to reduce the consumption of conventional energy sources pushes most researchers to improve the output of renewable energy. In our study, which was conducted on the solar chimney, we began to increase the surface area of the absorbing surface while maintaining the same limits by increasing the ribbing of the surface. Modeling wooden box 1m3 of room 27m3 and multiple forms were studied theoretically and practically. In the practical side (flat absorber plate, V-grooved absorber plate and trapezoidal plate) was studied with dimensions (0.9 x 0.99) m, and the theoretical side (flat, V-grooved, Sinusoidal, Simi-circle outward and Simi-circle inward) absorber plates was studied with the same dimensions. Considering the variables that have been studied, namely the air gap (0.1,0.2) m as well as the inclination angle of the absorbing surface inside the chimney inward (0°,5°,10°,15°). The results obtained from the practical side proved a great agreement with the theoretical with an error rate that does not exceed 15%. The results, based on air change per hour (ACH) from an experimental and numerical results showed that the best type is (V-grooved corrugated absorber plate) with an angle of inclination 10° with 9.6 ACH more than flat absorber plate by 10% and mor thane trapezoidal by 17%. In thermotical work used Ansys Fluent V18.1 to solve and simulation the case of solar chimney with types of absorber corrugated plates using the governing equation with standard k-ɛ and the result of calculation based of the air change per hour is the sinusoidal absorber plate is best than V-grooved and enhanced the ACH by 24%.