Establishing multi-criteria optimization of return vent height for underfloor air distribution system

Qin, Chao; Fang, Hongqiang; Wu, Shihai; Lu, Wangtao

doi:10.1016/j.jobe.2022.104800

Cited by 3 publications

(7 citation statements)

References 42 publications

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“…When the vents are at a lower H, more heat accumulates in the upper portion of the office space because the vents remove (cooler) air from the lower portion. As a consequence, the room temperature drops as H increases, which is concordant with extant research [4,[8][9][10]16,17,22] on IJV and UFAD systems.…”

Section: Temperature Fieldssupporting

confidence: 89%

“…The OZ-averaged CO2 concentration shows a quantitatively increasing trend, and the age of the air in the OZ reduces as H increases (Figure 9), which is consistent with refs. [2,4,10,16,17,22,24]. inconsistencies can be explained by the fact that the body plume was terminated at the mid-level in ref.…”

Section: Comparison Of Iaq Performancementioning

confidence: 99%

Section: Comparison Of Iaq Performancementioning

confidence: 99%

“…The third method uses multiple criteria to optimize a single factor. For instance, H has been optimized for impinging jet ventilation systems [2,16] and a UFAD system [17] using the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS), which is a robust multi-criteria decision-making approach.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing the Return Vent Height for Improved Performance in Stratified Air Distribution Systems

Qiao,

Wu,

Zhang

et al. 2024

Buildings

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One of the factors that strongly impacts the efficacy of stratified air distribution (STRAD) systems is the return vent height (H), for which different studies have yielded different suggested values. This theoretical research uses a displacement ventilation (DV) system as an example to examine how the H affects the efficacy of STRAD systems through analysis of the trade-offs between the cost of the vertical temperature gradient and the benefits of energy reduction. The key results are as follows: (a) The energy savings due to a lower H are smaller than the cost of the vertical temperature gradient for all STRAD systems. (b) With a supply temperature (Ts) set at 18 °C, elevated return vent positions can result in excessively cooled areas, while extremely low vent positions create a temperature gradient exceeding 3 °C between the head and ankles. (c) The TOPSIS methodology reveals that the optimal H value lies in the range of 1.5–2.3 m when Ts is 18 °C. (d) When adjusting the Ts value to achieve thermal neutrality, 2.3 m is identified as the optimal H value, demonstrating superior performance over the 1.5 m to 2.3 m range at 18 °C Ts. These findings highlight the benefit of a higher H for STRAD systems and the significance of configuring ventilation systems for thermal neutrality.

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Section: Temperature Fieldssupporting

confidence: 89%

Section: Comparison Of Iaq Performancementioning

confidence: 99%

Section: Comparison Of Iaq Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimizing the Return Vent Height for Improved Performance in Stratified Air Distribution Systems

Qiao,

Wu,

Zhang

et al. 2024

Buildings

Self Cite

View full text Add to dashboard Cite

show abstract

“…[ 53 ] was conducted under an isothermal situation. Validation of the heat transfer and thermal buoyancy models can be found in our previous research [ 54 , 55 ]. The simulated velocity, temperature, and turbulent kinetic energy were compared with measured data reported by Kobayashi et al [ 23 ].…”

Section: Models and Methodsmentioning

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

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Balancing ventilation performance and energy conservation: An integrated multi-objective optimization and preference-based decision-making model for optimizing impinging jet ventilation

Tan,

et al. 2024

Applied Thermal Engineering

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Establishing multi-criteria optimization of return vent height for underfloor air distribution system

Cited by 3 publications

References 42 publications

Optimizing the Return Vent Height for Improved Performance in Stratified Air Distribution Systems

Optimizing the Return Vent Height for Improved Performance in Stratified Air Distribution Systems

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

Balancing ventilation performance and energy conservation: An integrated multi-objective optimization and preference-based decision-making model for optimizing impinging jet ventilation

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