Numerical Simulation of Solar Chimney Integrated with Exhaust of Thermal Power Plant

Al-Kayiem, Hussain H. and Khor, Yin Yin and Chin, Yee Sing (2012) Numerical Simulation of Solar Chimney Integrated with Exhaust of Thermal Power Plant. In: Advanced Computational Methods and Experiments in Heat Transfer XII. WIT Press.

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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 k-epsilon 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 solar flue gas collector is about 2.5 m.

Keywords: solar chimney, numerical analysis, CFD, energy conversion,
energy recovery, flue gases.

Item Type: Book Section
Subjects: T Technology > TJ Mechanical engineering and machinery
Departments / MOR / COE: Departments > Mechanical Engineering
Research Institutes > Energy
Depositing User: Yee Sing Chin
Date Deposited: 22 Nov 2012 02:56
Last Modified: 19 Jan 2017 08:21

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