Investigation on the thermal performance of a composite Trombe wall under steady state condition

Zhou, Liqun; Huo, Junpeng; Zhou, Tong; Jin, Shufeng

doi:10.1016/j.enbuild.2020.109815

Cited by 58 publications

(18 citation statements)

References 27 publications

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“…To evaluate the validity of the CFD model, the simulation results are compared to the results reported by Zhou et al 34 . The solar thermal efficiency (η) of the double-channel porous solar wall can be computed as: where A is the effective absorbing area, I is the solar radiation intensity, and Q is the heat storage.…”

Section: Numerical Simulation Detailsmentioning

confidence: 99%

Numerical study on the impact of wall structure on the thermal performance of double-channel porous solar wall

Lin

Tao

et al. 2022

Sci Rep

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With the improvement of people’s living standards, they have higher requirements for indoor thermal comfort in the cold season. Solar wall utilizing solar energy for heating can reduce carbon emissions and achieve carbon neutrality. In the aspect of solar wall research, the influence of wall structure on the thermal performance of double-channel porous solar wall is limitedly investigated. In fact, the optimization design of wall structure is important for the thermal performance of solar wall and its applications. Therefore, a simplified three dimensional room model is built to study the influence of the wall structure on the thermal performance of porous solar wall by numerical simulation. With this model, different channel spacing and thickness of porous walls were used to determine the optimal design for a double-channel porous solar wall in terms of enhancing the heat storage. Moreover, the influence of the surface emissivity on the characteristics of heating and temperature field of double-channel porous solar wall are studied based on the optimal structure. The CFD simulation results indicate that the optimal structure parameters should include spacing of 0.08 m for channel 1, the porous wall thickness should be 0.08 m, and the air channel 2 spacing should be 0.06 m. The temperature of air channel 1 and air channel 2, the indoor temperature, and the heat storage of porous wall decrease with the increase of the surface emissivity of the porous wall. In order to improve the heat storage performance of double-channel porous solar wall, the outer surface of the porous wall should use a lower emissivity material. The outer surface emissivity of porous wall has a significant impact on the heat storage of the porous wall and little effect on the thermal storage wall. The temperature of porous wall is always higher than that of outdoor environment temperature.

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Section: Numerical Simulation Detailsmentioning

confidence: 99%

Numerical study on the impact of wall structure on the thermal performance of double-channel porous solar wall

Lin

Tao

et al. 2022

Sci Rep

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“…En Viegas et al (2018), se desarrolló un sistema de calefacción en viviendas utilizando hormigón y agua encapsulada, a partir de piezas modulares de elevado peso, que presentó un mejor desempeño que los muros másicos sólidos. En Zhou et al (2020) se muestran los beneficios de incorporar un muro de agua (a baja temperatura) por delante de un muro másico para mejorar la climatización. Se destaca que tiene mejor rendimiento diurno y reduce la pérdida de calor durante la noche.…”

Section: Sistemas Solares Pasivos Aplicados a Espacios Agroproductivosunclassified

Estabilización térmica de espacios agro-productivos a partir de un sistema solar pasivo modular con variaciones de la masa térmica

Viegas¹,

Jodra²,

Discoli³

et al. 2020

iit

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Los ámbitos destinados a la agroproducción se resuelven frecuentemente con estructuras livianas. En su interior se presentan condiciones de picos de temperatura que afectan a los cultivos produciendo enfriamiento o sobrecalentamiento. En este contexto, el presente trabajo presenta la comparación del comportamiento térmico interior de un invernadero liviano vacío y con la incorporación de un sistema pasivo acumulador, amortiguador térmico, modular, industrializable y versátil para configurar diferentes condiciones de carga térmica y estabilizar su temperatura. El sistema presenta dos versiones, sólo con materialidad sólida, y combinando la misma con agua encapsulada, presentado los beneficios de su incorporación. En este contexto, el trabajo tiene por objetivo profundizar en la evaluación de una solución tecnológica solar pasiva para climatización de espacios agroproductivos, a través de comparar la respuesta térmica, la carga y el aporte térmico en el uso de variantes de masa únicamente sólida; y masa mixta sólida y líquida (hormigón y agua). La metodología desarrolla la fabricación, instalación y ensayo en laboratorio de un invernadero con la incorporación de mesas de cultivo construidas con los sistemas acumuladores/amortiguadores térmicos para su comparación. Los resultados muestran que los aportes térmicos máximos de los sistemas se cuantificaron en 17 MJ, 32 MJ y 36 MJ en los sistemas sólidos de 864 kg, sólido de 1968 kg y mixto de 864 kg, respectivamente. Se logra aproximadamente el doble aporte térmico que el sistema más liviano ya sea por aumento de masa sólida como por reemplazo de igual masa sólida por mixta. Asimismo los costos de los sistemas se registran como 17,1 u$s/MJ; 20,7 u$s/MJ y 9 u$s/MJ para el sistema sólido de 864 kg, sólido de 1968 kg y mixto de 864kg, respectivamente, demostrando la reducción de costos en el sistema mixto respecto a los demás.

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“…At present, research is being conducted to improve the structure of a TW. In terms of glass cover, there are mainly single-layer, double-layer, and three-layer forms [12,13], as well as the electrochromic type [14] and the use of a water wall instead of glass cover [15]. Additionally, enhancements to TW technology have been explored, including the incorporation of shutters, the integration of DC fans into the lower vent [16], the introduction of newly designed built-in grille channels [17], and modifications to the shape of both the upper and lower vents [18].…”

Section: Introductionmentioning

confidence: 99%

Influence of a Built-in Finned Trombe Wall on the Indoor Thermal Environment in Cold Regions

Qi,

Wang,

Wang

2024

Energies

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This study focuses on energy conservation, reducing the amount of energy consumed to heat a room, and decreasing the intensity of carbon emissions. The research object is a room heated by a floor with a built-in finned Trombe wall (TW) located in Lanzhou, Gansu Province. ANSYS software was employed to conduct a simulation study on parameters such as fin height, transverse spacing, longitudinal spacing, arrangement mode, and fin apex angle. The simulation results were used to determine the fin parameters’ thermal impact on the TW’s thermal performance, including with respect to a room’s thermal environment (TE). The results show that the heat transfer performance of a TW with respect to the thermal environment of a room is the greatest when the height of the heat-absorbing surface is 20 mm, the transverse spacing is 0.20 m, the longitudinal spacing is 0.533 m, and in-line 90° top-angle fins, that is, isosceles right triangle fins, are used. The average Nu number of the fin-type TW is 154.75. Compared with the average Nu number of the finless TW, which is 141.43, the average Nu number increases by 13.32 due to the addition of fins. The optimized fin-type TW has 7.77% higher convective heat supply efficiency than the finless TW. Although the PMV-PPD results of the two TW-type rooms are not very different, the comfort period of the fin-type TW room is longer. At the same time, the LPD3 of the non-finned TW and the finned TW rooms is less than 10%, the wind speed at the head and ankle is less than 0.12 m/s, the air gust sensation is not strong, and the thermal comfort is good, indicating that the addition of fins is beneficial to the improvement of indoor thermal comfort. Compared to standard rooms, finless TW rooms and fin-type TW rooms have energy-saving rates of 36.38% and 44.63%, respectively. Thus, fin-type TW rooms’ energy saving rate is 8.25% higher, resulting in effective savings in heating energy consumption. Therefore, the indoor TE and auxiliary heating conditions are improved, and the integration of solar building technology can be facilitated, which offers significant reference value for energy transformation.

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Investigation on the thermal performance of a composite Trombe wall under steady state condition

Cited by 58 publications

References 27 publications

Numerical study on the impact of wall structure on the thermal performance of double-channel porous solar wall

Numerical study on the impact of wall structure on the thermal performance of double-channel porous solar wall

Estabilización térmica de espacios agro-productivos a partir de un sistema solar pasivo modular con variaciones de la masa térmica

Influence of a Built-in Finned Trombe Wall on the Indoor Thermal Environment in Cold Regions

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