Optimization study of return vent height for an impinging jet ventilation system with exhaust/return-split configuration by TOPSIS method

Ye, Xiao; Kang, Yanming; Yan, Zhenrong; Chen, Bin; Zhong, Ke

doi:10.1016/j.buildenv.2020.106858

Cited by 56 publications

(30 citation statements)

References 30 publications

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“… Lower energy efficiency [ 15 ]. Impinging jet ventilation (IJV) The air outlets were located on the side wall slightly above the ground [ 35 ]. Affected by buoyancy, rising conditioned air mixed with indoor air [ 36 ].…”

Section: Categories Of Different Ventilation Modesmentioning

confidence: 99%

“…After the jet hit the ground, it spread on the ground, thus sending fresh air into the personnel area [ 59 ]. The air inlet of IJV system was often located on the higher side wall to eliminate the polluted air [ 35 ]. The flow field of impingement jet in IJV system was composed of free jet, impingement zone and wall jet [ 36 ].…”

Section: Categories Of Different Ventilation Modesmentioning

confidence: 99%

“…For example, splitting the return device from the exhaust vent could improve air quality. The air age and CO 2 concentration decreased with the height increase of air outlet, and the result reached the standard requirement at about 1.2 m [ 35 ]. In addition, the shape and number of air outlets could be optimized to provide better results in pollutant removal and air exchange efficiency [ 60 ].…”

Section: Impacts On Thermal Comfort Air Quality and Virus Spread Controlmentioning

confidence: 99%

See 2 more Smart Citations

A review of different ventilation modes on thermal comfort, air quality and virus spread control

Fan

Wang

et al. 2022

Building and Environment

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In the era of Corona Virus Disease 2019 (COVID-19), inappropriate indoor ventilation may turn out to be the culprit of microbial contamination in enclosed spaces and deteriorate the environment. To collaboratively improve the thermal comfort, air quality and virus spread control effect, it was essential to have an overall understanding of different ventilation modes. Hence, this study reviewed the latest scientific literature on indoor ventilation modes and manuals of various countries, identified characteristics of different ventilation modes and evaluated effects in different application occasions, wherefore to further propose their main limitations and solutions in the epidemic era. For thermal comfort, various non-uniform ventilation modes could decrease the floor-to-ceiling temperature difference, draft rate or PPD by 60%, 80% or 33% respectively, or increase the PMV by 45%. Unsteady ventilation modes (including intermittent ventilation and pulsating ventilation) could lower PPD values by 12%–37.8%. While for air quality and virus spread control, non-uniform ventilation modes could lower the mean age of air or contaminants concentration by 28.3%–47% or 15%–47% respectively, increase the air change efficiency, contaminant removal effectiveness or protection efficiency by 6.6%–10.4%, 22.6% or 14%–50% respectively. Unsteady ventilation mode (pulsating ventilation) could reduce the peak pollutant concentration and exposure time to undesirable concentrations by 31% and 48% respectively. Non-uniform modes and unsteady modes presented better performance in thermal comfort, air quality and virus spread control, whereas relevant performance evaluation indexes were still imperfect and the application scenarios were also limited.

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Section: Categories Of Different Ventilation Modesmentioning

confidence: 99%

Section: Categories Of Different Ventilation Modesmentioning

confidence: 99%

Section: Impacts On Thermal Comfort Air Quality and Virus Spread Controlmentioning

confidence: 99%

See 1 more Smart Citation

A review of different ventilation modes on thermal comfort, air quality and virus spread control

Fan

Wang

et al. 2022

Building and Environment

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“…The developed research methodology of the RWJs can be used in the studies of air supply jets in impinging jet ventilation (IJV) systems [39]. IJV is a system with several advantages that are still being developed [39][40][41].…”

Section: Discussionmentioning

confidence: 99%

Study of Radial Wall Jets from Ceiling Diffusers at Variable Air Volume

2021

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The knowledge of the air velocity distribution in the supply jets is essential when designing ventilation and air conditioning systems. In this study, we tested and analyzed the velocity distributions in the radial wall jets—these jets are commonly used in ventilated rooms. Tests included jets from two ceiling diffusers of different constructions, at three airflow rates. The mean air speed distributions were measured with a 16-channel hot-sphere anemometer both in the self-similarity zone and in the terminal zone. A specially developed method of converting the mean speed to mean velocity was used. The measurement results show that the spread coefficients of the jets from both diffusers were the same, but the positions of the virtual origin were different. Due to the friction of the jet with the ceiling and the transfer of momentum to the recirculating flows, the momentum flux in the self-similarity zone decreased by up to 50%. An improved method for calculating velocity distributions in radial wall jets was developed and validated. This method takes into account the decrease of momentum, non-zero position of the jet origin, and faster velocity decrease in the terminal zone. A reliable method of predicting air velocity distribution in radial wall jets (RWJs) from ceiling diffusers may allow to properly select the diffuser size, its location, and the range of flow rate changes. The design process for variable air volume systems can be facilitated.

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“…The AHP method is also used to choosing the optimal technology to rehabilitate the pipes in water distribution systems [13]. TOPSIS is a multi-criteria method used to identify solutions from alternative sets based on simultaneous minimization of ideal point distances and maximizing distances from low points [14][15][16][17].…”

Section: Literature Reviewmentioning

confidence: 99%

Decision Support System for Determining Critical Land in Klaten Regency

et al. 2020

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Critical land has become a problem in the world. Critical land is very detrimental to the health of the land. Several factors cause the land to become critical. One of them is the use of land that is not by the capabilities of the land. If no repairs made, the land will be physically, chemically, and biologically damaged. Klaten Regency is one of the regencies in Central Java Province, which has quite extensive critical land. It is necessary to monitor and improve land quality regularly to avoid critical land problems. Data and information on critical land obtained from Klaten Regency processed into a decision support system. Decision Support System uses a combination of Analytical Hierarchy Process (AHP) and Technique For Order Preference by Similarity to Ideal Solution (TOPSIS) methods. In this research, a Web-based Decision Support System created to determine the critical land area in Klaten Regency. The information system created has an alternative menu and criteria that determine the potential of critical land in Klaten Regency, making it easier for users to obtain information.

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Optimization study of return vent height for an impinging jet ventilation system with exhaust/return-split configuration by TOPSIS method

Cited by 56 publications

References 30 publications

A review of different ventilation modes on thermal comfort, air quality and virus spread control

A review of different ventilation modes on thermal comfort, air quality and virus spread control

Study of Radial Wall Jets from Ceiling Diffusers at Variable Air Volume

Decision Support System for Determining Critical Land in Klaten Regency

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