Optimization of return vent height for stratified air distribution system with impinging jet supply satisfying threshold of |PMV| &lt; 0.5

Qin, Chao; Zhou, Wei-Ru; Fang, Hongqiang; Lu, Wen-Hsiang; Lee, Eric Wai Ming

doi:10.1016/j.jclepro.2022.132033

Cited by 16 publications

(10 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the extract effect of the thermal plume, the CO 2 can be carried up to the upper space. [45][46][47] Secondly, at the low background air temperature, the exhaled CO 2 with a high temperature more easily rose due to thermal buoyancy. 45 Finally, the exhaust air outlets of MV were located directly above occupants.…”

Section: Inhaled Air Qualitymentioning

confidence: 99%

“…[45][46][47] Secondly, at the low background air temperature, the exhaled CO 2 with a high temperature more easily rose due to thermal buoyancy. 45 Finally, the exhaust air outlets of MV were located directly above occupants. The CO 2 was just allowed to be carried by the thermal plumes and then exhausted favourably.…”

Section: Inhaled Air Qualitymentioning

confidence: 99%

“…The result was consistent with the conclusions of previous research. [45][46][47] For the heating mode, the thermal plume of the heat source mainly carried indoor pollutants. Setting the exhaust air outlet near the heat source can be beneficial for extracting the pollutants directly.…”

Section: Influence Of Exhaust Location On Inhaled Air Quality Under MVmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of heating performances of different ventilation methods in an office

Li,

Essah,

et al. 2023

Indoor and Built Environment

View full text Add to dashboard Cite

In this study, 12 cases were investigated in an office-layout room using experiments and computational fluid dynamics (CFD) simulations. The heating performances of four ventilation methods (i.e. mixing ventilation (MV), stratum ventilation (SV), deflection ventilation (DeV) and impinging jet ventilation (IJV)) were comprehensively compared by various evaluation indexes (i.e. predicted mean vote (PMV), draught rate (DR), vertical air temperature difference (△T), air diffusion performance index (ADPI), energy utilization coefficient (EUC), air change efficiency (ACE) and contaminant removal efficiency (CRE)). Better thermal comfort was found in rooms heated by SV and DeV. The PMV, DR and △T under SV and DeV complied with Category B of ISO 7730:2005, and the ADPI was in full compliance with the stipulation of ANSI/ASHRAE 113-2022. For the energy-saving characteristic, the targeted-occupied-zone ventilation methods (i.e. SV, DeV and IJV) can effectively deliver warm air to the occupied zone, with the EUC values higher than unity and thus providing a good potential for energy saving. SV and IJV showed slightly higher ACEs in the breathing zone. The contaminant removal effectiveness of SV, DeV and IJV was comparable. Under the combined influence of occupant thermal plumes and locations of exhausts, MV showed a high CRE. However, the CRE under MV decreased significantly when the exhausts were not above occupants. In the case of supply air parameters in this study, the entropy-weight method indicated that DeV and SV had a better overall performance for winter heating, followed by IJV and then MV.

show abstract

Section: Inhaled Air Qualitymentioning

confidence: 99%

Section: Inhaled Air Qualitymentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of heating performances of different ventilation methods in an office

Li,

Essah,

et al. 2023

Indoor and Built Environment

View full text Add to dashboard Cite

show abstract

“…Impinging jet ventilation (IJV) systems would be a promising alternative in cooling densely occupied spaces. Imping jet diffusers supply cold air with high momentum that impinges on the floor and forms a thin cold air layer [ 19 ]. This layer of air can reach far due to high momentum and negative buoyancy.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, previous research on IJV performances focused primarily on small enclosures or spaces with few rows of occupants. For instance, Qin et al [ 19 , 21 ] and Ye et al [ 22 ] reported CO 2 distribution in a small office with two staff; Wang et al [ 20 ] investigated the contaminant removal for an intensive care unit occupied by four occupants. Secondly, investigations about IJV systems focused mainly on thermal comfort, IAQ, and energy saving, while IJV system's performance on the risk of cross-infection is rarely studied.…”

Section: Introductionmentioning

confidence: 99%

Transmission mitigation of COVID-19: Exhaled contaminants removal and energy saving in densely occupied space by impinging jet ventilation

Qin

Zhang

et al. 2023

Building and Environment

Self Cite

View full text Add to dashboard Cite

Optimization study of heating performance for an impinging jet ventilation system based on data-driven model coupled with TOPSIS method

Kang

et al. 2022

Building and Environment

View full text Add to dashboard Cite

Optimization of return vent height for stratified air distribution system with impinging jet supply satisfying threshold of |PMV| < 0.5

Cited by 16 publications

References 55 publications

Evaluation of heating performances of different ventilation methods in an office

Evaluation of heating performances of different ventilation methods in an office

Transmission mitigation of COVID-19: Exhaled contaminants removal and energy saving in densely occupied space by impinging jet ventilation

Optimization study of heating performance for an impinging jet ventilation system based on data-driven model coupled with TOPSIS method

Contact Info

Product

Resources

About