Study and analysis of air flow characteristics in Trombe wall

Du, Li; Lin, Ping; Chen, Yongming

doi:10.1016/j.renene.2020.08.040

Cited by 33 publications

(14 citation statements)

References 11 publications

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“…(5) RNG k-ε turbulence model equation 22 : where G k represents the average velocity gradient generated by the turbulent kinetic energy, G b denotes the generation term of turbulent kinetic energy caused by buoyancy force, Y M is the influence of the fluctuating expansion of compressible turbulence on the total dissipation rate, and α k and α ε are the effective Prandtl values of k and ε, respectively.…”

Section: Numerical Simulation Detailsmentioning

confidence: 99%

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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%

“…Du et al studied the impact of air flow velocity on the thermal performance of the Trombe Wall. They found that the wall structure and wall size have a close relationship with air flow velocity 22 . Bajc et al used CFD to analyze the temperature field in the Trombe wall for several days of a typical meteorological year.…”

Section: Introductionmentioning

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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“…Along with the modification of the Trombe wall, the phenomena of heat exchange occurring between the individual layers are also analyzed. The article [6] focuses on the analysis of air velocity through the Trombe wall. Also in article [7], in addition to the air flow rate and air temperatures, the heat flux, the conductive heat transfer, and the exergy 2 of 19 gain through the massive wall were numerically determined.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Glazing on the Functioning of a Trombe Wall Containing a Phase Change Material

et al. 2021

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Among the technological solutions for external walls, the Trombe wall is an interesting proposition for obtaining solar radiation energy. The aim of the presented research is to determine the influence of glazing parameters on the thermal performance of the Trombe wall containing a phase change material (PCM). In the experimental tests, three glazing (G1, G2, and G3) with different heat transfer coefficient (Ug) and total solar energy transmittance factor (g) were used. The tests were carried out under laboratory conditions in a small-scale simulation chamber. The thermal energy of absorbed solar radiation was simulated with a heating panel. All of the walls are characterized by high dynamics of operation in the first two days. From the moment of heating, the walls achieve the minimum value of the heat flux after 16–18 h. In practice, this means the highest thermal efficiency of the wall during the night of the next day. A noticeable influence of the type of glazing on the operation of the barrier was found. The obtained results suggest that the most effective barrier for “sunny days” is the B1 barrier. The B2 barrier is suitable for alternating days in the cycle: “sunny day”, “cloudy day”. However, the B3 barrier is the most advantageous in periods with a predominance of “cloudy days”. In addition to the experimental studies, a numerical model of the B1 barrier was developed and simulation was carried out using the finite element method. The simulation results were consistent with the experimental tests. The second numerical simulation confirmed the rightness of using the heating panel in experimental tests.

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“…Researchers favor the most important renewable energy, passive solar strategies, because of its abundant reserves, convenient development, and utilization. One of these strategies that recently received significant attention because of its multiple applications is its specific construction package known as the double-skin façade, Second Skin Façade, or Passive Façade like Trombe walls and solar chimneys (Du et al, 2020a;Poirazis, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…This point is since a double-glazed skin can reflect and absorb some part of the spectrum of solar radiation; consequently, the most efficient is the use of double-glazing skin with low-emittance in the façade (Prieto et al, 2018;Zalewski et al, 2002). Among the other most critical aspects studied in the literature are the following: Air gap (Chen et al, 2006;Du et al, 2020b;Parhizkar et al, 2020), Massive wall and Heat insulation (Hu et al, 2020;Liu et al, 2020;Nizovtsev et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Study of Four Passive Second Skin Façade Configurations as a Natural Ventilation System During Winter and Summer

Hamidi

Malha

Bah

2021

sace

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The fight against climate change is a significant challenge, resulting mainly from the linear and extensive exploitation of natural resources, particularly fossil fuels. Its impacts are now recognized. The current climate models are neither sustainable nor ecological in economic and social terms, especially as we live in a century marked by galloping demography and urbanization. Researchers worldwide have paid great attention to passive solar design strategies such as double skin or Second Skin Façade. From this point, the present work aims to contribute to a better understanding of the feasibility of using a passive façade as a useful technology for natural ventilation to achieve potential energy savings and improve thermal comfort and indoor air quality. For this purpose, a parametric study was conducted for a room with four different southern facade configurations in six Moroccan climatic zones; the difference between each lies in the vent's position in the entrance and exit. This process was done by using COMSOL Multiphysics software. Velocity and volume flow rate fields were analyzed. The proposed configurations provided an average volume flow rate between 200 m3/h and 400 m3/h for a surface of 1 m2 of southern façade with an air vent area of 0.1mx0.2m.

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Study and analysis of air flow characteristics in Trombe wall

Cited by 33 publications

References 11 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

The Influence of Glazing on the Functioning of a Trombe Wall Containing a Phase Change Material

Study of Four Passive Second Skin Façade Configurations as a Natural Ventilation System During Winter and Summer

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