CFD modeling and experimental validation of the thermal performance of a novel dynamic PCM Trombe wall: Comparison with the companion static wall with and without PCM

Zhou, Shiqiang; Razaqpur, A. Ghani

doi:10.1016/j.apenergy.2023.121985

Cited by 21 publications

(2 citation statements)

References 49 publications

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“…The motivation behind this research stems from the pressing need to address the growing concerns surrounding energy-efficient buildings. Nowadays, the building sector accounts for over 30% of global primary energy consumption and contributes to nearly 30% of the annual greenhouse gas emissions worldwide [18][19][20][21][22]. Despite significant strides in Trombe wall research, a critical gap persists.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis for a New Trombe Wall Concept

Bulmez,

Brezeanu,

Dragomir

et al. 2024

Buildings

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The envelope (façade) of a building is the first barrier between the exterior and the interior of the building and withstands the highest variation in temperature and solar radiation. Trombe walls are used to take advantage of that and contribute to the heating of interior air, helping the heating system. In this study, a new Trombe wall design is presented to contribute significantly to the indoor ventilation of residential buildings. For this, an exterior wall equipped with a proposed Trombe system was studied in a numerical simulation analysis. The proposed systems consist of two important sections, an exterior one and an interior one. The air cavities on the exterior of the wall, covered with silica glass, are the first heat-transfer layer. The secondary layer used for heat transfer, on the interior, is comprised of a MPCLB wall of 115 mm. The air circulation from the exterior to the interior was established as forced convection with a ventilator. The air circulates through the first heating layer on the exterior air cavities and then passes through the second heating layer on the interior MPCLBs. Two cities in Romania were considered to represent the coldest and hottest climates in Romania. Brașov represents the cold climate and Constanța represents the hot climate. In the investigation, both the presence and absence of solar radiation were taken into account. In total, four cases were established. For all four cases, monthly research was made using monthly mean temperatures, and direct and diffuse solar radiation. The results are promising and illustrate that the system works best during the transitional seasons of spring and autumn. The lower the outdoor temperature, the higher the temperature can be increased. Overall, solar radiation accounted for an average 2 °C increase. The temperature increase varied between 3.4 °C and 15.99 °C for Brașov and between 6.42 °C and 12.07 °C in Constanța. This study presents an alternative way to use the Trombe wall for indoor ventilation purposes throughout the year, compared to traditional uses for the Trombe wall for indoor heating.

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Section: Introductionmentioning

confidence: 99%

CFD Analysis for a New Trombe Wall Concept

Bulmez,

Brezeanu,

Dragomir

et al. 2024

Buildings

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“…To predict system behaviors and to understand the physics of buildings, the utilization of the computational fluid dynamics (CFD) method is very useful before the construction of buildings in locations where massive urbanization is envisaged [21][22][23]. Fidaros et al [24] developed a two-dimensional CFD model to examine 10 different geometric configurations of a T-wall cross-section.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Assessment on Roof Geometry and Trombe Wall Shape for Improving Buildings’ Heating Performance

Dhahri,

Yüksel,

Aouinet

et al. 2024

Buildings

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It is crucial to consider structural design issues in Trombe wall (T-wall) buildings to promote more suitable indoor climates and thermal comfort standards. Therefore, the present study examined the impact of two different T-wall designs and six different roof types on the energy and operational efficiency of a building located in a low-temperature and high-humidity winter climate. Ansys-CFX 15.0 software was employed to simulate the thermal and fluid dynamics behavior of the T-wall system, and flow, thermal comfort, energy, and exergy analyses were conducted. Three-dimensional simulation results and the pertinent literature data showed a good level of agreement, and the accuracy of the model was ensured. Outcomes revealed an average air velocity variation of 0.186 m/s and maximum average indoor air temperature variation of 3.3 °C between the six roof geometries. The highest air speed (0.988 m/s) was recorded for the gambrel roof while the lowest one (0.802 m/s) was recorded for the typical flat roof. The shed roof right with a rounded T-wall was more comfortable for standing and sitting activity than the others for the two T-wall shapes, and, at Y = 0.6 m and Y = 1.1 m, the average predicted percentages of dissatisfied (PPD) values were 31 and 28%, respectively. Furthermore, it was determined in the study that solar radiation intensity and T-wall and roof geometries had a significant effect on energy and exergy efficiency, and high energy and exergy efficiencies were achieved at higher solar intensity values. The best energy and exergy efficiencies were obtained for the butterfly and shed roof configurations. This study can serve as a reference for the thermal environment design of buildings with T-walls.

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Investigation on heat transfer characteristics of multi-duct Trombe wall based on multi-mode heat exchange in winter

Li,

Zhang,

et al. 2024

Applied Thermal Engineering

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CFD modeling and experimental validation of the thermal performance of a novel dynamic PCM Trombe wall: Comparison with the companion static wall with and without PCM

Cited by 21 publications

References 49 publications

CFD Analysis for a New Trombe Wall Concept

CFD Analysis for a New Trombe Wall Concept

Efficiency Assessment on Roof Geometry and Trombe Wall Shape for Improving Buildings’ Heating Performance

Investigation on heat transfer characteristics of multi-duct Trombe wall based on multi-mode heat exchange in winter

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