AIVC - Air Infiltration and Ventilation Centre

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Investigation of indoor air quality in a residence using natural materials

Indoor air quality (IAQ) in a house using building materials with low chemical emission wasinvestigated for 8 months. Indoor air concentration, emission rate of aldehydes and VOCsfrom floor and wall, air change rate, temperature and relative humidity were measured toevaluate the IAQ of the house. Air change rate was measured by two methods. Indoor airconcentration and emission rate from building materials were measured at differentconstruction phases (before and after completion) and after being occupied. A questionnairewas used to examine the influence of lifestyle on IAQ.

Measurements of aldehydes and VOCs in a newly constructed, multi-family residential building using passive methods

Unique means to evaluate IAQ with passive sampling devices are described in this paper.They are simple, silent and require less equipment. Field measurements in a newlyconstructed, multi-family residential building were conducted with these means and theresults show the effect of ventilation, occupancy and interior finishing on IAQ. Indoor airconcentration, emission rates from indoor surfaces and ventilation rate were measured bypassive sampling methods. The ADSEC method was used for emission measurements. ThePFT method was used for measurement of the ventilation rate.

The development of indoor air quality during the first year in new, residential buildings

A 3-year research project was established in 1999 to create numerical reference data forindoor air quality follow-up in new buildings. A total of 12 measurement sites, representingthe present construction practice in Finland, were chosen for investigation. Low-emittingsurface materials according to the Finnish Classification of Building Materials were used atall sites. The indoor air VOCs, formaldehyde and ammonia concentration as well as thetemperature, relative humidity and the air exchange rate were defined for the newly finishedbuilding.

A pilot study on VOCs and carbonyl compounds in Chinese residences

The concentrations of volatile organic compounds (VOCs) and carbonyl compounds were measuredat 40 residences in three cities of China (30 from Chengdu, five each from Changsha and Beijing).Indoor, outdoor and personal exposure samples were simultaneously collected at each site. The average concentrations of benzene, toluene, xylene, especially benzene, were significantly higher than those of other countries both indoor and outdoor. There is significant correlation between indoor concentration and personal exposure of VOCs and carbonyl compounds.

Aldehydes and VOCs in newly-built unoccupied houses in Tokyo

The Ministry of Health, Labor and Welfare in Japan have published the guideline values for14 chemical compounds including formaldehyde, toluene, xylenes etc., in order to solve theSick house syndrome problem. In this study, field measurements on indoor air quality wereconducted in newly-built houses which had not been occupied.The concentrations of aldehydes and VOCs, the ventilation rate, the emission rate offormaldehyde from each surface material, temperature and humidity were measured in threehouses in summer and in two houses in winter.

Measurements of indoor concentrations of aldehydes, VOCs and fungi in newly built apartment houses in Tokyo

The purpose of this study is to identify the causality explaining indoor concentrations offormaldehyde, VOCs and fungi which have significant health effects. In the rainy season(July), summer (August), autumn (October) and winter (December), measurements werecarried out in three newly built apartment complexes. In each complex the same buildingmaterials were used.

Evaluation and demonstration of domestic ventilation systems. VENSET program.

VENSET is a VENtilation Sytems Evaluation Tool for dwellings and is the final result of IEA Annex 27 evaluation and demonstration of domestic ventilation systems.The main idea for this annex was to develop tools to better evaluate domestic ventilation systems in dwellings in various situations. Different systems in various climates must handle situations with a large range of residential behaviour.

Ventilation in dutch houses, a study in a representative sample of the dutch housing stock

The goal of this study was the determination of the existing situation in houses with regard to air quality and energy used for ventilation in relation to the health of inhabitants. For the energy policy the Government is considering increased energy requirements for dwellings. They are permanently opposed in doing so by people who are concerned about negative health effect due to increased requirements on for instance air tightness of buildings. To have at least a reference point, they are interested in the existing situation.

Analysis of a ventilated residential building by means of an air based radiative cooling system

The thermal performance of a monozone building located in Lisbon is studied when night ventilation combined with radiative cooling is used in order to remove the heat from indoors. For simulating the thermal behaviour of the building, a commercial energy building software is used. The potential for radiative cooling in Lisbon, as well as the efficiency of the radiative cooling system were investigated previously. A validated numerical model is used in order to predict the temperature of the air at the outlet of the radiative system.

Energy efficient residential ventilation control

A concept is investigated for the energy efficient control of residential mechanical ventilation in response to outdoor air temperature and the corresponding stack-driven infiltration. The control concept takes advantage of the natural air leakage characteristics of a house and the ability of temperature-driven stack infiltration to provide ventilation air to the house. As the outdoor to indoor temperature difference increases and natural infiltration increases, the fan operation is reduced, thereby minimizing over-ventilation.

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