Thermal Storage Capacity and Night Ventilation Performance of a Solar Chimney Combined with Different PCMs

Lü, Jun; Gao, Xiaolong; Li, Qianru

doi:10.1155/2017/8363190

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…This approach holds immense promise for improving indoor thermal comfort conditions while also reducing reliance on mechanical cooling systems. Studies have shown that integrating phase-change materials with solar chimneys can extend the duration of efficient ventilation even after sunset [68]. PCM possesses unique properties such as high latent heat density and isothermal phase change characteristics, making it an ideal candidate for integration into solar absorbers or chimney designs.…”

Section: Solar Chimney and Ventilator Integrationmentioning

confidence: 99%

Research on the Passive Cooling System of Solar Photovoltaic Panel Based on Hybrid Solar Chimney and Ventilator

Zhang,

Misaran,

Adzrie

et al. 2023

J. Phys.: Conf. Ser.

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The efficiency of solar photovoltaic (PV) power generation is significantly impacted by factors such as ambient temperature, surrounding wind speed, and the temperature of the solar PV panels. The power generation efficiency of these panels diminishes by approximately 0.5% for each incremental rise in their temperature. To mitigate this effect, two primary methods for cooling solar photovoltaic panels are considered: active and passive cooling techniques. This review paper delves into an extensive body of literature on solar passive cooling systems, highlighting the vital role of passive cooling technology in enhancing the efficiency of solar PV power generation. We investigate the structure and cooling effect of diverse passive cooling systems, with a specific focus on the application of solar chimneys and ventilators in cooling systems for solar PV panels. Our study reveals that solar chimneys, using buoyancy, can decrease the temperature of solar PV panels by as much as 15 degrees, thereby augmenting power generation efficiency. Furthermore, the deployment of ventilator technology can boost the efficiency of solar PV power generation to an impressive 46.54%. In conclusion, this paper proposes the synergistic use of solar chimneys and ventilators to improve solar PV panel efficiency, extend their lifespan, and reduce the environmental impact resulting from inefficient solar PV panels. This comprehensive approach should inform future practices.

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Section: Solar Chimney and Ventilator Integrationmentioning

confidence: 99%

Research on the Passive Cooling System of Solar Photovoltaic Panel Based on Hybrid Solar Chimney and Ventilator

Zhang,

Misaran,

Adzrie

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…Therefore, energy losses analysis is relevant for optimizing solar chimney design. Based on theoretical studies, nearly 50% of the solar energy is lost through glass cover to ambient (Lu et al, 2017). In addition, the absorber plate backside without good thermal insulation reduces system efficiency by up to 60% (Afonso and Oliveira, 2000).…”

Section: Introductionmentioning

confidence: 99%

Experimental study and numerical analysis of radiative losses of single-channel solar chimney

Torres-Aguilar

Arce

Xamán

et al. 2022

Journal of Building Physics

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Solar chimneys provide natural ventilation for buildings, reducing the energy consumption of mechanical systems. Therefore, analyzing energy losses through solar chimney components and inlet/outlet of air channel is critical to develop a suitable design for this passive ventilation system. In this study, the performance and energy losses analysis of a single-channel solar chimney (SC-SOCH) is described; a parametric study under laboratory conditions was conducted regarding the air gap (0.10, 0.15, and 0.20 m) and heat flux of absorber plate (100, 200, 300, 400, and 500 Wm−2). The energy losses were analyzed with temperature sensors, heat flow transducers, and a net radiation transfer model. The parametric study results showed that between 10% and 15% of the total energy supplied to the absorber plate was dissipated to the laboratory environment through the glass cover. Furthermore, combining the different thermal insulation layers on the backside of the absorber plate and sidewalls of the air channel permitted only energy losses below 8% of the total energy supplied. The highest energy losses occurred due to radiative exchange; the radiative losses through the inlet and outlet of the air channel were between 9.38% and 25.78% of the total energy supplied. However, the radiative energy loss rate decreased as airflow increased; the volumetric flow rate was from 34.11 to 94.92 m3h−1, which was enough to satisfy the requirements of total ventilation rate for spaces of 9, 18, and 36 m2 according to ASHRAE 62.2–2019. Therefore, solar chimney designs must be optimized to minimize energy losses and increase airflow for natural ventilation.

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Mathematical models of solar chimneys with a phase change material for ventilation of buildings: A review using global energy balance

Vargas-López

Xamán

Hernández-Pérez

et al. 2019

Energy

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Thermal Storage Capacity and Night Ventilation Performance of a Solar Chimney Combined with Different PCMs

Cited by 6 publications

References 26 publications

Research on the Passive Cooling System of Solar Photovoltaic Panel Based on Hybrid Solar Chimney and Ventilator

Research on the Passive Cooling System of Solar Photovoltaic Panel Based on Hybrid Solar Chimney and Ventilator

Experimental study and numerical analysis of radiative losses of single-channel solar chimney

Mathematical models of solar chimneys with a phase change material for ventilation of buildings: A review using global energy balance

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