A numerical study of a PCM-based passive solar chimney with a finned absorber

Tiji, Mohammadreza Ebrahimnataj; Eisapour, Mehdi; Yousefzadeh, Reza; Azadian, Mohammad; Talebizadehsardari, Pouyan

doi:10.1016/j.jobe.2020.101516

Cited by 29 publications

(7 citation statements)

References 32 publications

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“…The findings showed that integrating PCM improved the ventilation rate and slowed the rate of decrease during the discharge phase (6 h) when the halogen lamps did not deliver any energy to the solar chimney, as demonstrated in Figure 21. [102] explored the efficiency of a solar chimney with PCM storage (Sodium sulphate decahydrate (Na2SO4•10H2O)) with and without fins linked to the absorber plate. The aim was to investigate the velocity and temperature distributions, in addition to the airflow rate inside a room, with and without the PCM and fins, and then compare the results to a non-PCM chimney.…”

Section: Solar Chimney-related Studiesmentioning

confidence: 99%

Recent Advances, Development, and Impact of Using Phase Change Materials as Thermal Energy Storage in Different Solar Energy Systems: A Review

Rashid

Al‐Obaidi

Dulaimi

et al. 2023

Designs

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The efficient utilization of solar energy technology is significantly enhanced by the application of energy storage, which plays an essential role. Nowadays, a wide variety of applications deal with energy storage. Due to the intermittent nature of solar radiation, phase change materials are excellent options for use in several types of solar energy systems. This overview of the relevant literature thoroughly discusses the applications of phase change materials, including solar collectors, solar stills, solar ponds, solar air heaters, and solar chimneys. Despite the complexity of their availability and high costs, phase change materials are utilized in the majority of solar energy techniques because of the considerable technical improvements they provide. While numerous studies have investigated the progress of phase change materials used in solar energy applications such as photovoltaic systems, it is vital to understand the conceptual knowledge of employing phase change materials in various types of solar thermal energy systems. Investigations into the use of phase change materials in solar applications for the purpose of storing thermal energy are still being carried out to upgrade the overall performance. This paper briefly reviews recently published studies between 2016 and 2023 that utilized phase change materials as thermal energy storage in different solar energy systems by collecting more than 74 examples from the open literature. This study focuses on demonstrating the maturity of phase change materials and their integration into solar energy applications. Based on the findings, proposals for new research projects are made.

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Section: Solar Chimney-related Studiesmentioning

confidence: 99%

Recent Advances, Development, and Impact of Using Phase Change Materials as Thermal Energy Storage in Different Solar Energy Systems: A Review

Rashid

Al‐Obaidi

Dulaimi

et al. 2023

Designs

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“…Among many studies on improving the heat storage capacity of absorption walls, it is worth mentioning that PCM integration into the solar chimney has been verified to affect ventilation rates and thermal comfort positively. By integrating PCM, a solar chimney can effectively store solar energy during the day and release heat at night, thereby improving the solar chimney performances and making the indoor temperature uniform [46]. Dordelly et al [47] investigate the influence of integrating a PCM on the performance of two laboratory prototypes of solar chimneys and verified the effectiveness of integrating solar chimney and PCM to improve ventilation efficiency.…”

Section: Influencing Factors Of Solar Chimney Performancementioning

confidence: 99%

Solar Chimney Applications in Buildings

2021

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A solar chimney is a renewable energy system used to enhance the natural ventilation in a building based on solar and wind energy. It is one of the most representative solar-assisted passive ventilation systems attached to the building envelope. It performs exceptionally in enhancing natural ventilation and improving thermal comfort under certain climate conditions. The ventilation enhancement of solar chimneys has been widely studied numerically and experimentally. The assessment of solar chimney systems based on buoyancy ventilation relies heavily on the natural environment, experimental environment, and performance prediction methods, bringing great difficulties to quantitative analysis and parameterization research. With the increase in volume and complexity of modern building structures, current studies of solar chimneys have not yet obtained a unified design strategy and corresponding guidance. Meanwhile, combining a solar chimney with other passive ventilation systems has attracted much attention. The solar chimney-based integrated passive-assisted ventilation systems prolong the service life of an independent system and strengthen the ventilation ability for indoor cooling and heating. However, the progress is still slow regarding expanded applications and related research of solar chimneys in large volume and multi-layer buildings, and contradictory conclusions appear due to the inherent complexity of the system.

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“…Meanwhile, the experimental results show that the melting time of the PCM in the open charging mode is 57% longer than in the closed charging mode, with an 11-hour delay for melting [15], and a 10℃ drop in the phase change temperature which results in a 50% reduction in melting time and a 70% increase in solidification time [16]. Tiji et al [17] demonstrated that finned storage can significantly recover energy dissipation while also increasing the average temperature of the room by 20% compared to a system without fins. The presence of the fins, which create a non-uniform airflow inside the room, increases the rate of flow by roughly 40%.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on an Integrated Solar Chimney with Latent Heat Thermal Energy Storage in Various Arrangements

Buonomo¹,

Golia²,

Manca³

et al. 2022

IJSDP

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The paper presents a two-dimensional numerical investigation of a solar chimney combined with an absorbing capacity wall in a building’s south façade. The analysis was carried out in Aversa (Italy), in July and December, from sunrise to sunset. The chimney is made up of a converging channel, a vertical absorbing wall, and a two-degree angled glass plate. It is 5.0 m tall, while the height of the channel is 4.0 m, with an inlet of 0.34 m and an outlet portion of 0.20 m. A phase change material with metal foam makes up the thermal energy storage system. Four possible configurations are investigated to identify the ideal hybrid system arrangement in terms of thermal performance; the commercial code Ansys-Fluent is used to solve the problem. The results of the thermal energy storage system with metal foam and PCM are provided in terms of liquid fractions, stored energy, and stream function fields, while the ones of the wall temperature distributions in the channel are reported. Thermal and fluid dynamics behaviours are so evaluated to have some useful indications to improve the system.

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A numerical study of a PCM-based passive solar chimney with a finned absorber

Cited by 29 publications

References 32 publications

Recent Advances, Development, and Impact of Using Phase Change Materials as Thermal Energy Storage in Different Solar Energy Systems: A Review

Recent Advances, Development, and Impact of Using Phase Change Materials as Thermal Energy Storage in Different Solar Energy Systems: A Review

Solar Chimney Applications in Buildings

A Numerical Study on an Integrated Solar Chimney with Latent Heat Thermal Energy Storage in Various Arrangements

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