AIVC - Air Infiltration and Ventilation Centre

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On the behaviour of radon daughters in indoor air.

The effect of small aerosol particles and the effect of air cleaning devices on the behaviour of the decay products of radon have been studied. The long term measurements in a one-family house have shown that the behaviour of the decay produc

The use of a constant concentration tracer gas system to measure ventilation in buildings.

A constant concentration tracer gas system was designed and constructed to continuously measure the air infiltration rate in as many as ten zones of a building. The portable, microcomputer controlled system injects a metered amount of tracer

Demonstration of Energy Conservation Through Reduction of Air Infiltration in Electrically Heated Houses

Fifty-nine owners/occupants of electrically heated houses in the Denver, Colorado area have, for about ten months, been participating in a study sponsored by the Electric Power Research Institute (EPRI) to determine theeffect of air infi

Development and field verification of a model of excess and house air infiltration for single-family residences

Several empirical models of house air infiltration, available from the literature, were reviewed and evaluated. Without exception, the limitations, inherent in these models, were found to stem from inadequate accounting of the interactive forces controlling air infiltration. In general, each of the available models was found to accurately reflect the specific real case used for verification, but extension of the model to other structures and situations was found to be totally inadequate.

Designing Houses for Energy Conservation

Domestic demands account for about 40% of total energy supplies in Sweden. This article reviews research by the Building Technology Division of the Swedish Royal Institute of Technology over many years into the thermal behavior of houses. It highlights the importance of effective insulation and of solar heat gains in particular situations, entailing modifications to conventional design calculations.

Water vapor mass balance method for determining air infiltration rates in houses.

A water vapour mass balance technique that includes the use of common humidity-control equipment can be used to determine average air infiltration rates in buildings. Only measurements of the humidity inside and outside the home, the mass of vapour exchanged by a humidifier/dehumidifier, and the volume of interior air space are needed. This method gives results that compare favourably with those obtained with standard methods using tracer gas.

Wind flows and induced pressure on buildings. Application to solar collectors. Ecoulements et charges induits par le vent sur les batiments. Application aux capteurs solaires.

The study, carried out in an atmospheric wind tunnel (reproduction of natural wind conditions, particularly turbulence), quantifies wind flows around built-up obstacles in their realistic location context, and the associated pressure fields. For various types of buildings (detached house, block of flats), the article presents in illustrated form the chart of these flows and pressures in general (mean values, standard deviations, extreme values), but deals more specifically with the wind resistance of solar collectors.

Tests of air quality in three London (Ontario) homes.

Tests were performed in 3 homes for 1) carbon monoxide, 2) nitrogen dioxide, 3) nitric oxide, 4) total hydrocarbons and 5) formaldehyde. Total particulate matter, by a numerical counting method, was also measured in Homes 1 and 2.

 

The relationship between indoor nitrogen dioxide concentration levels and personal exposure: a pilot study.

A small, personal monitoring study was performed in a subpopulation (14 families) of a case-control study on the relationship between indoor nitrogen dioxide exposure and respiratory diseases of school children. 

Indoor NO2 pollution and personal exposure to NO2 in two areas with different outdoor NO2 pollution.

Indoor NO2 concentrations were measured in the kitchen, the living room and bedroom of 612 houses in two different areas in the Netherlands. In asub-sample, personal exposure of the housewives to NO2 was measured. NO2concentrations indoors depended on the presence or absence of (un)vented gas appliances. Personal NO2 exposure was only different between the two areas in the group with the lowest indoor concentrations. It was concluded that with respect to NO2 exposure it is impossible to categorize groups without accounting for gas appliances inside the house.

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