Efficiency improvement of the solar chimneys by insertion of hanging metallic tubes in the collector: Experiment and computational fluid dynamics simulation

Rezaei, Loghman; Saeidi, Samrand; Abdollahi, Mohammadreza; Gróf, Gyula; Chen, Wei‐Hsin; Sápi, András; Klemeš, Jiří Jaromír

doi:10.1016/j.jclepro.2023.137692

Cited by 8 publications

(1 citation statement)

References 48 publications

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“…Traditional natural ventilation methods, such as opening windows and doors, and directing draughts through the hall can help fresh outdoor air to enter the house. However, people's living habits, and architectural design often influence their effectiveness, making 2 of 16 the ventilation efficiency unsatisfactory [9,10]. However, due to technological developments, new natural ventilation techniques, such as atrium ventilation, ventilated roofs, and ventilated chimneys can optimize airflow, and improve the ventilation efficiency to a greater extent [11,12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis and Full-Scale Experimental Validation of a Lower Wall-Mounted Solar Chimney with Different Radiation Models

et al. 2023

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As a type of passive architectural structure, wall-mounted solar chimneys enhance the natural ventilation volume of a building’s interior, and maximize reductions in the building’s operational energy consumption. They are indispensable in the building’s energy conservation and emission reduction. Therefore, measuring the wall-mounted solar chimney’s flow characteristics and relevant index parameters is particularly important. This paper uses a combination of full-scale experiments and numerical simulation to conduct a detailed analysis of the wall-mounted solar chimney. Four different radiation models, namely DO (discrete ordinates), S2S (surface-to-surface), MC (Monte Carlo), and Rosseland are used for comparison, and the results of the numerical simulation are compared with the experimental data. The results show that the maximum turbulent viscosity of the fluid predicted by the S2S radiation model is higher than that of the MC and DO models by 16.87% and 8.44%, respectively. The errors of the DO radiation model in the midline and glass cover plate direction concerning the experimental results are only 0.33% and 0.15%, respectively. The mistakes of the MC radiation model in these two directions are 0.51% and 0.47%, respectively. The DO radiation model is more suitable in numerical simulation predictions related to the wall-mounted solar chimney.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis and Full-Scale Experimental Validation of a Lower Wall-Mounted Solar Chimney with Different Radiation Models

et al. 2023

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Numerical investigation on performance of a solar chimney power plant with different absorber configurations

Mahdhi,

Ghriss,

Aryanfar

et al. 2024

Env Prog and Sustain Energy

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A solar tower system is a nonpolluting solar thermal power plant that utilizes a combination of a wind turbine and generator to convert thermal energy generated from a solar collector into electrical energy. The study focuses on a system comprising a solar collector that transforms solar energy into thermal energy, a chimney that converts thermal energy into kinetic energy, and a wind turbine that further converts kinetic energy into electrical energy. The system's performance is evaluated through the implementation of a numerical model, which is validated by comparing it with experimental data. Four different types of meshes are tested to determine the most suitable mesh for the system. The discrete ordinate radiation model is used to solve the radiative transfer equation, and the RNG k‐𝜀 turbulence model is implemented to calculate turbulence. In a subsequent study, the effect of absorber configuration on the system's performance is investigated. Three different absorber configurations—sinusoidal, square, and triangular—are proposed, and the numerical results showed that the system's performance is affected by the absorber configuration. The velocity in the chimney inlet increases for all proposed configurations compared to the standard configuration, with the triangular configuration showing the highest velocity increase. Additionally, the newly proposed configurations enhance the thermal efficiency of the system, leading to a thermal efficiency of 12.18%, 12.2%, and 13.65% for the sinusoidal, triangular, and square configurations, respectively. Overall, the solar tower system demonstrates its potential as a clean and efficient source of electrical power.

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Optimization of characteristic parameters of rectangular solar chimney adapted to agricultural greenhouses

Nie,

Xu,

et al. 2024

Case Studies in Thermal Engineering

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Efficiency improvement of the solar chimneys by insertion of hanging metallic tubes in the collector: Experiment and computational fluid dynamics simulation

Cited by 8 publications

References 48 publications

Numerical Simulation Analysis and Full-Scale Experimental Validation of a Lower Wall-Mounted Solar Chimney with Different Radiation Models

Numerical Simulation Analysis and Full-Scale Experimental Validation of a Lower Wall-Mounted Solar Chimney with Different Radiation Models

Numerical investigation on performance of a solar chimney power plant with different absorber configurations

Optimization of characteristic parameters of rectangular solar chimney adapted to agricultural greenhouses

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