scholarly journals Study on the influence of pollution source location on indoor pollutant distribution under different air supply

2017 ◽  
Vol 205 ◽  
pp. 2623-2630 ◽  
Author(s):  
Shui Yu ◽  
Zhitian Yu ◽  
Xiunan Ma ◽  
Guojuan Zhang ◽  
Guohui Feng
Keyword(s):  
Source Location ◽  
Pollution Source ◽  
Air Supply ◽  
Indoor Pollutant ◽  
Pollutant Distribution

Dispersion of indoor air pollutants emitted at near-floor levels in rooms with floor heating and mixing ventilation

2016 ◽  
Vol 27 (2) ◽  
pp. 205-218 ◽  
Author(s):  
Andrius Jurelionis ◽  
Laura Stasiuliene ◽  
Tadas Prasauskas ◽  
Dainius Martuzevicius
Keyword(s):  
Personal Exposure ◽  
Pollution Source ◽  
Pollutant Removal ◽  
Cold Surface ◽  
Air Supply ◽  
Air Change Rate ◽  
Low Energy Buildings ◽  
High Level ◽  
Indoor Air Pollutants ◽  
Floor Heating

The usage of floor heating is increasing in low-energy buildings as it enables efficient applications of low-exergy level heat sources as well as provides a uniform distribution of air temperature and low air velocities in heated spaces. The aim of this study was to analyse the effects of floor heating on the dispersion of gaseous pollutants emitted at the floor level, considering that carpets and flooring materials can be sources of such pollution. Mixing ventilation with high-level wall grille air supply and in-ceiling four-way air supply was tested numerically and experimentally in the full-scale chamber at the air change rate of 2 h−1. Three positions of a heated dummy in relation to the pollution source, cold surface and air supply diffusers were analysed. Both experiments and CFD predictions revealed the overall positive effect of floor heating on ventilation effectiveness and personal exposure. Floor heating increased pollutant removal effectiveness by 5% and reduced personal exposure by 22% on average.

scholarly journals Modelling indoor pollutant distribution via passive scalar and virtual box approach

2021 ◽  
Vol 327 ◽  
pp. 05001
Author(s):  
George Pitchurov ◽  
Detelin Markov ◽  
Iskra Simova ◽  
Rositsa Velichkova ◽  
Peter Stankov ◽  
...  
Keyword(s):  
Mass Flux ◽  
Body Shape ◽  
Passive Scalar ◽  
Thermal Manikin ◽  
Breathing Zone ◽  
Ansys Fluent ◽  
Indoor Pollutant ◽  
Pollutant Source ◽  
Pollutant Distribution ◽  
Occupied Zone

The distribution of PM2.5 around a thermal manikin with realistic female body shape in a naturally ventilated room has been modelled. The health risk (HR) due to inhalation of the PM2.5 has been quantified by integrating the pollutants mass flux over the boundaries of a virtual box around the mannequin’s head (the breathing zone). By the same approach HR is evaluated over the boundaries of another virtual box that surrounds the manikins body and defines the occupied zone. The paper focuses on the peculiarities of creating and meshing a virtual geometry, as well as on the application of user-defined functions (UDF) for defining a pollutant source within the room using Ansys Fluent modelling package.

Improving occupational health by modelling indoor pollutant distribution

Facilities ◽  
2016 ◽  
Vol 34 (5/6) ◽  
pp. 289-301 ◽  
Author(s):  
Rui Pitarma ◽  
Miguel Lourenço ◽  
João Ramos
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Design Procedure ◽  
Distribution Patterns ◽  
Indoor Environments ◽  
Content Type ◽  
Indoor Pollutant ◽  
Pollutant Source ◽  
Pollutant Distribution

Purpose Indoor environments are characterized by several pollutant sources. Some of these can be sufficiently characterized through the prediction of the airflow and pollutant distribution patterns. The purpose of this study was to simulate, analyze and compare different locations of known pollutant source inside a ventilated room. Design/methodology/approach Computational fluid dynamics modelling approach was used to analyze the prediction of the airflow and pollutant distribution patterns for different locations of known pollutant source inside a ventilated room by mixing ventilation. Findings Distinct areas of poor air quality, perfectly identified by concentration fields, were given. The indoor air quality obtained by the different simulated conditions was analyzed and compared. Research limitations/implications Pollutant concentration was not measured in the validation experiments (qualitative validation based on the velocity fields). Practical implications Once the contaminant concentration fields are calculated based on the source location, the model is very useful to choose the best place to install any pollutant indoor equipment to preserve breathing zones. Originality/value Providing an effective indoor air quality assessment to prevent exposure risk. The results would be useful for making decisions to optimize the design procedure, such as establish the best location to install polluting equipment, occupied areas and their interdependence with ventilation systems. In addition, this tool also helps to choose the best location and correct set point adjustment for the pollutant sensors.

scholarly journals Preliminary Study on Pollution Isolation of Civil Air Defence Underground Engineering

2020 ◽  
Vol 194 ◽  
pp. 04045
Author(s):  
Ji Yunzhe ◽  
Wang Xiaojie ◽  
Li Jintian
Keyword(s):  
Pressure Difference ◽  
Cfd Simulation ◽  
Pollution Source ◽  
Ventilation Mode ◽  
Underground Engineering ◽  
Isolation Room ◽  
Air Supply ◽  
Emergency Ventilation ◽  
Clean Area ◽  
Preliminary Study

In order to control the airborne spread of pollutants in civil air defences underground projects, the pollution source rooms are isolated. In this paper, CFD simulation technology is used to compare the effect of different positions of air supply and exhaust outlets on the removal of contaminants in the polluted isolation room. Pressure difference control is proposed to prevent the diffusion of polluted air from the isolation room to the clean area, and the realization of pressure difference control under emergency ventilation mode is discussed.

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