Effects of ceiling exhaust location on thermal comfort and age of air in room under impinging jet supply scheme

Qin, Chao; Lu, Wangtao

doi:10.1016/j.jobe.2020.101966

Cited by 14 publications

(20 citation statements)

References 31 publications

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“…In this work, these scenarios were used in cases (1) and (2), while the worst scenarios are when supply and return are on the same side. This work yields the same results as (Qin and Lu, 2021), who demonstrate that installing a ceiling exhaust diffuser in the center increases air age and improves heat removal efficiency (Qin and Lu, 2021). The results were also compared with (Shokrollahi et al, 2020) by comparing temperature distribution throughout the middle room height; both studies produced a matching velocity profile.…”

Section: Resultssupporting

confidence: 54%

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Computational Fluid Dynamic Optimization of Supply and Return Duct Position for Zone Air Distribution

Kareem

Khdir

2021

Polytechnic j.

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Air conditioning accounts for roughly half of all energy consumption in residential buildings. Today’s issue is optimizing the air conditioning system and methods of conveying heated and cooled air to prevent additional energy consumption. The optimal supply and return duct position is studied and the results based on the minimum air temperature and pressure in the room, while the room air distribution is taken into account. The main objective of air conditioning, which is impacted by duct position, is to provide thermal comfort in the room. Using Computational Fluid Dynamic, a controlled zone is designed and analyzed in the room with fourteen different duct position cases (ANSYS - FLUENT). The duct position is then optimized based on thermal comfort and uniform distribution of air temperature. The findings revealed that the location of supply and return ducts has a significant impact on minimum room air temperature and room air distributions. Across all cases, the temperature ranges from (294 K to 297 K).

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Section: Resultssupporting

confidence: 54%

“…CFD is being used to optimize the mean age of air and thermal comfort. The results showed that locating the ceiling exhaust in the center has a longer age of air and locating the ceiling exhaust near a thermal source will improve heat removal efficiency (Qin and Lu, 2021).…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic Optimization of Supply and Return Duct Position for Zone Air Distribution

Kareem

Khdir

2021

Polytechnic j.

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“…The smaller the value of τ P , the stronger the ability to remove pollutants [ 40 ]. The transport equation for τ P is written as [ 41 ]:

where Sc τ denotes the turbulent Schmidt number. In this study, the value of Sc τ was set to 0.7.…”

Section: Methodsmentioning

confidence: 99%

Bioaerosol distribution characteristics and potential SARS-CoV-2 infection risk in a multi-compartment dental clinic

Liu

Yao

et al. 2022

Building and Environment

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“…The cumulative distribution function F(τ) refers to the proportion of air micro-particles with an AoA of younger than τ. τ p is a passive scalar and governed by the equation [2]:…”

Section: Aoamentioning

confidence: 99%

“…Their indoor thermal comfort directly affects their business and urban tourism [1]. Both thermal comfort and IAQ are beneficial to human health [2], since people spend almost 90% of their time indoors at present [3]. A thermal discomfort or poor IAQ environment reduces the productivity of dwellers and even their wellbeing [4].…”

Section: Introductionmentioning

confidence: 99%

Research on Indoor Thermal Comfort and Age of Air in Qilou Street Shop under Mechanical Ventilation Scheme: A Case Study of Nanning Traditional Block in Southern China

Huang

2021

Sustainability

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In hot summers, air conditioning (AC) and mechanical ventilation (such as fans) are used as cooling modes that strongly influence the resultant indoor environment, like thermal comfort and air quality in the shops of a Nanning arcade street (qilou). The air circulation mode in shops greatly affects the indoor thermal environment and level of air freshness. The approaches for effectively improving the indoor thermal comfort and air quality are developed in qilou street shops with air-conditioner in a humid and hot region in southern China. Consequently, the purpose of this study is to assess different ventilation schemes in order to identify the best one. By using two indices, i.e., the predicted mean vote (PMV) and the age of air (AoA), in situ measurement and numerical simulation are conducted to investigate humans’ thermal comfort in extreme summer. Then, the indoor thermal comfort and AoA levels in summer under three different ventilation schemes (upper-inlet–upper-outlet, upper-inlet–bottom-outlet, and side-inlet–side-outlet) are comparatively analyzed through numerical computations of the indoor thermal environment. The results show that the upper-inlet–upper-outlet mode of the AC ventilation scheme led to the creation of a favorable air quality and comfortable thermal environment inside the shop, which will help designers understand the influence of the ventilation scheme on the indoor thermal comfort and health environment.

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Effects of ceiling exhaust location on thermal comfort and age of air in room under impinging jet supply scheme

Cited by 14 publications

References 31 publications

Computational Fluid Dynamic Optimization of Supply and Return Duct Position for Zone Air Distribution

Computational Fluid Dynamic Optimization of Supply and Return Duct Position for Zone Air Distribution

Bioaerosol distribution characteristics and potential SARS-CoV-2 infection risk in a multi-compartment dental clinic

Research on Indoor Thermal Comfort and Age of Air in Qilou Street Shop under Mechanical Ventilation Scheme: A Case Study of Nanning Traditional Block in Southern China

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