Analysing ventilation efficiency in a test chamber using age-of-air concept and CFD technology

Kwon, Kilsung; Lee, I.-B.; Han, Hwa-Taek; Shin, Cheol-Yong; Hwang, Hyunseung; Hong, Suk-Jin; Bitog, J. P.; Seo, Il Won; Han, Cheolheui

doi:10.1016/j.biosystemseng.2011.08.013

Cited by 39 publications

(16 citation statements)

References 19 publications

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“…The age of air, the time which takes for fresh air from an inlet to reach a designated point inside the structure, can be used to assess the ventilation efficiency and air quality in an agricultural facility [27] . Except for the horizontal planes at the lying and standing height of cows (y=0.…”

Section: Age Of Airmentioning

confidence: 99%

Numerical investigation on effects of side curtain opening behavior on indoor climate of naturally ventilated dairy buildings

Yao

Ding

et al. 2020

International Journal of Agricultural and Biological Engineering

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The side-curtain is popular in cattle buildings to regulate indoor climates and ventilation rates by adjusting the opening ratio. It normally had three different adjusting strategies relate to the position of rollers, i.e. central roller (S1), top roller (S2) and bottom roller (S3), which result in different opening behaviors to generate the same opening ratio but different opening positions in the side wall for a full-curtain house. Numerical simulations were conducted using computational fluid dynamics (CFD) to investigate the effects of the eight potential opening behaviors of side curtains on the indoor climates and airflow rates in winter for a typical naturally ventilated dairy house in China when the opening ratio were 8.5% and 17%. Airflow patterns, wind chilled temperature (WCT) and age of air were analyzed in the animal occupied zone (AOZ) by taking reference planes. Openings at the very bottom of side walls had more efficient ventilation due to the younger air age, more effective air disturbing, more uniformly distributed indicators in AOZ. However, it will result in a lower WCT in AOZ although a lower ventilation rate was observed in this case. Openings on the very top of side wall would generate a better thermal comfort in AOZ but with very poor air quality and nonuniformly distributed airflows in the dairy house. S1 was not recommended to the practical application due to the poor indoor climate and the higher cost of the mechanical structure. Based on the comprehensive evaluations of the analytic hierarchy process, the most satisfaction opening positions were at the bottom of the side curtains and the optimized adjusting strategy is S2.

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Section: Age Of Airmentioning

confidence: 99%

Numerical investigation on effects of side curtain opening behavior on indoor climate of naturally ventilated dairy buildings

Yao

Ding

et al. 2020

International Journal of Agricultural and Biological Engineering

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“…The local mean age (LMA) and local mean residual lifetime (LMR) were used to evaluate the efficiency of ventilation (Kwon et al, 2011). During the ventilation process, fresh air can reach any point through various pathways.…”

Section: 7mentioning

confidence: 99%

Computational fluid dynamics for non-experts: Development of a user-friendly CFD simulator (HNVR-SYS) for natural ventilation design applications

Kim

Hong

Norton

et al. 2020

Biosystems Engineering

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Measuring the ventilation rate is crucial to ensuring the control of thermal comfort, energy saving, and emission of pollutants in greenhouses and animal houses. This is more difficult in naturally ventilated (NV) buildings because of the dynamic and complex air flow patterns caused by wind and buoyancy effects. In this study, a user-friendly computational fluid dynamics (CFD) simulator is developed to analyse internal airflow patterns and ventilation rates of NV buildings, with the initial focus on agricultural buildings. The userfriendly CFD automation program, developed using the freely available open-source OpenFOAM and ParaView visualization toolkit, is aimed at non-CFD experts to help them obtain practical CFD solutions quickly. Users simply input building and ventilating configurations, outdoor wind conditions, topographical conditions, and information regarding plants or animals through user-friendly graphical user interfaces. General CFD processes are automated, and the quality of each process is controlled. After executing the program, a three-dimensional interactive visualization module is used for post-processing. It can ensure the flexibility and manageability of the model by automating predeveloped procedures in a user-interactive manner, thereby reducing time and effort. This paper describes the development process of automation interfaces.

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“…Moreover, some IAQ indexes were computed using simulation results and discussed. The proposed indexes are usually applied for IAQ assessment and a quantitative evaluation of ventilation system performance with regard to contaminant removal and infection risk control [54,55,56]. Once the distribution of the dependent variables inside the OT, i.e.…”

Section: Iaq Indexes Evaluationmentioning

confidence: 99%

Microclimate and Indoor Air Quality in an Operating Theatre under real use Conditions — An Experimental and Numerical Investigation

Balocco¹,

Petrone²

2015

Current Air Quality Issues

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Analysing ventilation efficiency in a test chamber using age-of-air concept and CFD technology

Cited by 39 publications

References 19 publications

Numerical investigation on effects of side curtain opening behavior on indoor climate of naturally ventilated dairy buildings

Numerical investigation on effects of side curtain opening behavior on indoor climate of naturally ventilated dairy buildings

Computational fluid dynamics for non-experts: Development of a user-friendly CFD simulator (HNVR-SYS) for natural ventilation design applications

Microclimate and Indoor Air Quality in an Operating Theatre under real use Conditions — An Experimental and Numerical Investigation

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