Thermal performance modeling of modified absorber wall of solar chimney-shaped channels system for building ventilation
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Thermal performance modeling of modified absorber wall of solar chimney‑shaped channels system for building ventilation Maher Dhahri1 · Saeed Nekoonam2 · Aouinet Hana3 · Mamdouh El Haj Assad4 · Müslüm Arıcı5 · Mohsen Sharifpur6,7 · Habib Sammouda1 Received: 14 July 2020 / Accepted: 14 September 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract This paper aims to compare the thermal performance of four different configurations of absorber wall for the solar chimneyshaped channels. A detailed energy and exergy analysis has been performed for various solar radiation intensities. Using Computational Fluid Dynamics technique, the four configurations are examined in order to determine the optimal configuration. The configurations are described by a flat corner, rounded corner, triangle corner and trapeze corner. The Computational Fluid Dynamics results were validated against experimental data from the literature, and a good agreement between the prediction and measurement was achieved. The results indicate that (1) the exergy and energy efficiencies increase with solar radiation and the energy efficiency is always higher than the exergy efficiency, (2) the energy efficiency of triangle corner is 50% higher than that of the trapeze corner configuration, 67% higher than that of the rounded corner and 2% higher than that of the flat corner when the solar radiation intensity is 480 W m−2, (3) the triangle corner increases the air temperature and pressure in the solar chimney which results in an optimum air mass flow rate which enhances the ventilation and (4) the comparison among the four configurations shows that the triangle corner configuration results in higher efficiency when a solar chimney is used as a natural ventilator. Keywords Solar chimney · CFD · Thermal performance · Building List of symbols t Time (s) k Turbulent kinetic energy (m2 s−2) l Turbulent mixing length (m)
i, j Cartesian coordinate index Ca Constant pressure specific heat (J kg−1 K−1) T Temperature (K) K Thermal conductivity (W m−1 K−1)
* Mamdouh El Haj Assad [email protected]
Sousse, Sousse University, BP 4011, Hammam Sousse, Tunisia
* Mohsen Sharifpur [email protected]; [email protected]
2
Department of Renewable Energies and Environment, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
Maher Dhahri [email protected]
3
Private Higher School of Engineering and Applied Technologies, Sousse, Tunisia
Saeed Nekoonam [email protected]
4
SREE Department, University of Sharjah, Sharjah, United Arab Emirates
Aouinet Hana [email protected]
5
Müslüm Arıcı [email protected]
Mechanical Engineering Department, Engineering Faculty, Kocaeli University, Umuttepe Campus, 41001 Kocaeli, Turkey
6
Habib Sammouda [email protected]
Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam
7
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa
1
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