Experimental and numerical studies on dynamic thermal performance of hollow ventilated interior wall

Yu, Tao; Zhao, Jiangdong; Zhou, Jiri; Lei, Bo

doi:10.1016/j.applthermaleng.2020.115851

Cited by 8 publications

(8 citation statements)

References 25 publications

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“…The radiation energy is emitted by surface i, the part is absorbed directly by surface j, and other parts are reflected by surface k (k = 1, 2, 3, ., N) and then absorbed by surface j. Specifically, the absorption coefficient G ij may be expressed by equation (2), and it is shown as:…”

Section: Derivation Process Of Gebhart Absorption Coefficient Matrixmentioning

confidence: 99%

“…Radiation from normal temperature objects, such as radiation between building walls, exists in the form of long-wave radiation. 1,2 The exterior and interior of the building have different wall temperatures and widespread radiation heat transfer. Whether for the traditional convection air conditioning, or the air conditioning system that combines radiation and convection, the analysis of radiation heat transfer plays an important role in the determination of the cooling capacity and the analysis of energy consumption.…”

Section: Introductionmentioning

confidence: 99%

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Building thermal environment solution model and radiation heat transfer calculation model based on Gebhart absorption coefficient

Xiang

Huang

2023

Advances in Mechanical Engineering

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The building walls temperatures are different, and there are radiation heat transfers between the walls, which have the characteristics of multiple reflections and multiple absorptions. The Gebhart absorption coefficient considers the radiation energy both directly absorbed by the wall and indirectly absorbed by other walls multiple times reflections. The absorption coefficient Gij is used to represent the proportion of radiation energy absorbed by surface j from the radiation energy of surface i. Through employing Gebhart absorption coefficient, the Gebhart absorption coefficient matrix is constructed based on the wall angle factors and the wall radiation emissivity. The building thermal environment solution model is established, which can calculate the indoor air temperature and wall temperature. The wall radiation heat transfer calculation model is built to calculate the net radiation heat transfer of the walls. An experimental bench was carried out to verify the above theoretical calculation results. The research results showed that the theoretical calculated values of the air temperatures of the building thermal environment solution model were basically consistent with the measured values, and the deviation was within 0.25°C. The deviation between the calculated values of the wall temperatures and the measured values was basically within 1.0°C. The error between the calculated values of the wall radiation heat transfer calculation model and the measured values varied within a small range. The Gebhart absorption coefficient is more appropriate in characterizing radiation heat transfer mechanism of the walls, and it provides a new way and thought for the analysis of radiation heat transfer on building wall.

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Section: Derivation Process Of Gebhart Absorption Coefficient Matrixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Building thermal environment solution model and radiation heat transfer calculation model based on Gebhart absorption coefficient

Xiang

Huang

2023

Advances in Mechanical Engineering

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“…The use of active TES as a means of reducing the thermal load of buildings has received significant attention in recent years. In particular, researchers have been studying the use of ventilated block walls (VBWs) as an active TES solution [8][9][10][11][12]. In these types of walls, the hollow cores of the blocks are aligned to create air channels.…”

Section: Introductionmentioning

confidence: 99%

“…Their findings showed that the impact of channel air speed on the thermal storage performance was much higher than the impact of airflow temperature for a given channel size. The thermal performance of an interior VBW without outlet air to zone was examined in a few studies [11,12,19]. Yu et al [12] placed and stacked hollow concrete blocks creating a serpentine air channel.…”

Section: Introductionmentioning

confidence: 99%

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Generalizable Thermal Performance of Ventilated Block Walls and Energy Implication of Substitution for Wood-Frame Walls in Cold-Climate Buildings

2023

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Space heating and cooling of buildings is a major contributor to the ascending trend of global energy consumption and greenhouse gas (GHG) emissions. A potential solution to reduce the space heating and cooling is to use buildings’ mass for active thermal energy storage (TES). Having air circulation between an active TES and its associated zones can significantly enhance their thermal coupling; however, reported research studies have not focused on this kind of active TES. To that end, this study aimed to evaluate the thermal performance of a ventilated block wall (VBW) in reducing space heating and cooling loads in cold-climate buildings. In this system, air is circulated between a zone and the voided cores of a VBW, where the air exchanges heat with the wall before returning to the zone. To have a generalizable assessment of the system’s performance, typical-day and annual energy analyses were conducted under various boundary conditions and air circulation speeds. The study found that for a typical day with significant temperature fluctuation, a VBW with a 2 m/s air circulation speed throughout the day can lead to 67% more net energy exchange (the sum of thermal energy storage and release) when compared to having no air circulation. The annual analysis compared the energy performance between a VBW and a traditional wood-frame wall in three different cold climates. The results showed that substituting a wood-frame wall with a VBW can reduce space heating and cooling loads by 35.1 kWh/m2 (wall surface area) for a mixed dry–cold climate throughout the year. Having cement plaster as interior finishing can lead to 9% more net energy exchange than having drywall, on average, for all zone air temperature profiles.

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Experimental investigation on the effects of phase change material and different ventilation modes on the thermal storage, space heating and energy consumption characteristics of ventilated mortar blocks

Guo

Dong

Zou

et al. 2021

Journal of Energy Storage

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Experimental and numerical studies on dynamic thermal performance of hollow ventilated interior wall

Cited by 8 publications

References 25 publications

Building thermal environment solution model and radiation heat transfer calculation model based on Gebhart absorption coefficient

Building thermal environment solution model and radiation heat transfer calculation model based on Gebhart absorption coefficient

Generalizable Thermal Performance of Ventilated Block Walls and Energy Implication of Substitution for Wood-Frame Walls in Cold-Climate Buildings

Experimental investigation on the effects of phase change material and different ventilation modes on the thermal storage, space heating and energy consumption characteristics of ventilated mortar blocks

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