AIVC - Air Infiltration and Ventilation Centre

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Modelling large openings with COMIS.

Conjunction of Multizone Infiltration Specialists (COMIS) is a model that can be used to simulate air flow and pollutant patterns in a multizone structure. Experimental data from air flow measurements in single sided naturally ventilated spaces, common in urban environments, and from cross-ventilated spaces, are compared against predictions from COMIS. The single sided ventilation experiments were performed in a full scale building and a test cell, which led to the definition of a correction factor for COMIS.

Natural Ventilation through Large Openings - Measurements at Model Scale and Envelope Flow Theory

An overview is given of the current position regarding the use of wind tunnel modelling and envelope flow theory for determining natural ventilation through large openings. The overview is, to a large extent, a personal one and is illustrated primarily by recent research carried out in Nottingham, some of which has yet to be published in full.

Air conditioning in buildings - two words of caution.

Two specific areas are addressed: (1) The necessity for effective estimates of infiltration rates in buildings; and (2) The dependence of vapor compression air conditioning systems on refrigerant charge. It is shown that the estimate of air infiltration rates through simple tests such as "blower-tests" are not applicable. In addition, there may be measurable drops in the capacity of air conditioning systems (on the order of up to 10%) for noni significant variations in the refrigerant charge from the optimum value.

Airflow through horizontal openings.

This paper deals with the interzonal air movement in a building, throughhorizontal openings, under natural convective conditions. These airflow phenomena areinvestigated experimentally, through a series of experiments in the stairwell of a full-scalebuilding, using tracer gas technique. The resulting time-dependent concentration evolutionoffers a means of analyzing the flow field. These cases are also simulated by a CFD code, thatuses the finite-volume method and incorporates a low-Reynolds k-E two equation turbulencemodel.

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