CFD Analysis of Hybrid Solar Chimney Power Plant

Mohammed A Aurybi,Syed I.U Gilani,Ali A Ismaeel,Hussain H Al-Kayiem,S.A Abdul Karim,M.H Yusof,N Sa'Ad,N Zainuddin

doi:10.1051/matecconf/201822504011

Mohammed A Aurybi, Syed I.U Gilani + Show 6 more

Open Access

https://doi.org/10.1051/matecconf/201822504011

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Abstract

In this study, a novel approach has been proposed as a solar chimney integrated with an external heat source to extend the system operation during the absence of solar energy. Flue gas channels have been utilized to exchange heat with the air inside the collector of the solar chimney. The hybrid solar chimney has been investigated numerically by ANSYS-Fluent software, using discrete ordinates radiation model. The hybrid system was simulated in 3D, steady-state by solving Navier-Stokes and energy equations. The numerical results have been validated using experimental measurements of a conventional solar chimney. The influence of flue channels on the system performance was predicted and analyzed in hybrid mode. With 0.002 kg/s of flue gas at 100°C injected in flue channels during the daytime; hybrid mode results demonstrated enhancement of 24% and 9 % for velocity and temperature, respectively. The power generation was enhanced by 56%. It has been proved that the proposed technique is able to resolve the set back of night operation problem of the solar chimney plants.

Highlights

Other researchers suggested integration of the Solar Chimney Power Plant (SCPP) with external source to enhance the performance and to survive the system from power decline at night
The proposed channels can be work as a heat exchanger. [12] and [13] proposed hybrid SCPP model to enhance the plant performance by utilizing metal sheet as the absorber plate underneath the collector instead of the soil, the absorber plate stands as a heat exchanger which extract heat from the hot flue gas that flows through the bottom part of the collector while in the top/front of the absorber plate there was a collector which absorbed the solar energy to warm up the air inside it
Considering the problems associated with the conventional SCPP, the main objective of this paper is to introduce a proposed model of Hybrid Solar Chimney (HSC)

Summary

Introduction

Other researchers suggested integration of the SCPP with external source to enhance the performance and to survive the system from power decline at night. [12] and [13] proposed hybrid SCPP model to enhance the plant performance by utilizing metal sheet as the absorber plate underneath the collector instead of the soil, the absorber plate stands as a heat exchanger which extract heat from the hot flue gas that flows through the bottom part of the collector while in the top/front of the absorber plate there was a collector which absorbed the solar energy to warm up the air inside it. A model of conventional solar chimney (SC) is integrated with external source of heat, namely, flue gas. The proposed HSC utilized the flue gas waste heat which can be generated from the industrial operations or any external heat source and integrated with the conventional solar system to enhance the performance of the plant. In the proposed HSC, the wasted thermal energy in the exhaust gasses could be recovered as useful energy to heat up the air in the collector of the proposed system

Objectives

Results

Conclusion