AIVC - Air Infiltration and Ventilation Centre

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outdoor air

The penetration of gaseous pollutants into buildings in the case of a sudden contamination of the outdoor air.

A sudden contamination of the outdoor air by some toxic gas can have several causes. The primary goal of the investigation was to determine the protection afforded by sheltering indoors. The object of a computational approach was a single family house with two floors. Three different models were utilized as computing tools: MOVECOMP to calculate the infiltration air flows, MULTIC to calculate the contaminant transport inside the building and TDYN to calculate the temperature decay of the building.

METOP - Energy efficient office building.

A prototype of a low cost, low energy office building was built using a new Finnish component system building technology. Thanks to the energy efficient windows, the thermal insulation of the building envelope and the demand-controlled variable outdoor air flow HVAC system with heat recovery and energy-storing structures, the need for heating and cooling energy has been reduced to such a level that a low energy office can be cooled with outdoor air and with the aid of a heat recovery device. The building is kept warm with the support of its own operations almost throughout the year.

Indoor ozone concentrations: ventilation rate impacts and mechanisms of outdoor concentration attenuation.

The classification of outdoor (ambient) air as fresh for the purposes of ventilation is not always appropriate, particularly in urban areas. In many cities of the world, urban air frequently violates health-based air quality standards due to high ozone concentrations. The degree of protection from exposure to ozone offered by the indoor environment depends on the relationship between indoor and outdoor ozone levels. Existing concentration data indicates that indoor/outdoor ozone ratios range between 10 and 80%.

Effectiveness of hard connected duct into a forced air duct system as a means of providing ventilation and make-up air.

The primary purpose of this project was to determine if furnace heat exchangers were prematurely or excessively rusting due to condensation when fresh air ducts are hard connected to the return air system; In addition, occupants were to be interviewed to ascertain whether such systems were  causing cool drafts. The energy impact of this type of ventilation system and the practicality of installing high inside wall supply outlets was also to be investigated.