AIVC - Air Infiltration and Ventilation Centre

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CFD-based parametric study of ventilation and diesel exhaust in locomotive facilities

A CFD-based parametric study was carried out for a prototype general exhaust system widely used for ventilation and control of diesel exhaust in large enclosed locomotive facilities. The parameters of fan flow rate, ceiling height, fan spacing, and locomotive position relative to the fan were varied between two values representing the low and high ends of their expected ranges. A set of simulations was set up using factorial experimental theory, which allows variables and interactions having a significant effect on an outcome to be identified.

Pollutant dispersion in a large indoor space : Part 2 : Computational fluid dynamics predictions and comparison with a scale model experiment for isothermal flow

This paper reports on an investigation of the adequacy of CFD for the predicting isothermal pollutant transport in a large indoor space with simple geometry, no furniture and no occupants. Agreement between predictions and experimental measurements was good.

Pollutant dispersion in a large indoor space : Part 1 - Scaled experiments using a water-filled model with occupants and furniture

In this paper a detailed scaling analysis of a water tank experiment designed to model a large indoor space is presented, along with experimental results obtained with this model to assess the influence of furniture and people in the pollutant concentration field at breathing height.

Comparison of indoor air quality in electrified and un-electrified dwellings in rural South African villages

This paper provides scientific evidence that electrified homes in South African rural villages have lower levels of air pollution compared to the non-electrified homes using fuel or wood. The measured air pollutants were RSP (stationary respirable particulate matter), the CO in the kitchen and the CO on the child.

Indoor air quality in two different commercial buildings: Part 1: ventilation, temperature, humidity of air and gas concentrations

The main objective of this study was to investigate the Indoor Air Quality (IAQ) in officebuildings and to understand better how HVAC (Heating, Ventilation and Air-conditioning)systems work and what their effects are on IAQ over a sustained period. Two Frenchcommercial buildings were chosen, located in urban areas of Lyon and Paris, and for one daya month, over the course of 1 year, a number of IAQ related variables were recorded bothinside, including the HVAC system, and outside the buildings.

Wall relative humidity: a simple and reliable index for predicting Stachybotrys chartarum infestation in dwellings

The aim of that study was to compare measurements of wall relative humidity (RH) to mold identification in 458 samples from 100 dwellings. The mold identification was made by a direct microcospic examination of a sample collected on the wall by means of the gummed paper technique. The conclusion of that study was that a simple measurement of wall RH is a reliable index for suspecting S. Chartarum infestation in a dwelling.

Evidence of inadequate ventilation in portable classrooms : results of a pilot study in Los Angeles County

This paper deals with a pilot study in portable classrooms where neither adequate ventilation nor associated conditioning of indoor air for occupant comfort were provided. Concentrations of pollutants should be mitigated with an appropriate ventilation and should lead to a reduction of symptoms of "sick building syndrome"

Occurrence of phthalates and musk fragrances in indoor air and dust from apartments and kindergartens in Berlin (Germany)

The purpose of that study was to measure exposure levels of phthalates and musk fragrances in typical apartments, kindergartens and to estimate their effects on health. 59 apartments and 74 kindergarten in Berlin were studied.

Setting indoor air guidelines in Austria

Public health services are increasingly confronted with inquiries from the public concerningindoor air pollution. But so far no standardized procedures have been applied by authoritiesand experts in this field.

An interaction model for odour intensity

A laboratory study has been carried out to investigate the exposure response relationshipsbetween perceived air quality (PAQ) and concentration of pollutants. The objective was todevelop an interaction model for odour intensity, which allows predicting the perception of acombination of odours on base of the data for the single pollution sources. In the experiments10-12 persons assessed the PAQ in decipolB directly. Three different materials served aspollution sources.