Numerical Simulation Of Solar Chimney
Integrated With Exhaust Of Thermal Power Plant
Author(s)
H. H. Al-Kayiem, K. Yin Yin & C. Yee Sing
Abstract
The heat losses within exhaust gases are an unavoidable part of operating any
fuel-fired system. The flue gases still hold considerable thermal energy, which is
exhausted to the atmosphere as waste heat and contributes to global warming.
This paper presents a developed technique to enhance the performance of low
temperature solar thermal systems by utilization of thermal energy recovery of
flue gases. A CFD model was established based on the energy, momentum and
mass conservation and the state equation in 2-D, steady assumption with kepsilon
for the turbulence modelling using FLUENT – version 6.2.16 software.
The model simulates the thermal and fluids flow processes in an inclined
modified solar chimney. The flue inlet temperature was varied as, Tf g= 603K,
843K, and 983K. The simulation results were validated by comparison with
experimental results obtained from a lab scale model, and acceptable agreement
was gained. When the flue temperature is increased from 605K to 843K, the
performance is enhanced by 75%. The interesting find is that the efficiency of
heat collection tends to increase as the absorber length increases up to a certain
length, and then starts to decrease. In this study, the suitable dimension for solarflue
gas collector is about 2.5 m.
Keywords: solar chimney, numerical analysis, CFD, energy conversion,
energy recovery, flue gases.
1 Introduction
The potential of solar chimney as an energy source to produce power has been
widely researched and successfully demonstrated by numerous previous
experimental studies. A solar chimney power plant is one of the proven
Keywords
solar chimney, numerical analysis, CFD, energy conversion,energy recovery, flue gases.
Related Book
Other papers in this volume
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