AIVC - Air Infiltration and Ventilation Centre

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mathematical modelling

The use of computational modeling techniques for cleanroom design.

This paper presents the results of a computational and experimental study to assess the possible benefits of using mathematical modeling techniques for cleanroom design. A two-dimensional modeling visualization has been used for each of the cases studied. This has the advantage that its relative cheapness allows more design variations to be analyzed than would be possible with a three-dimensional method. Full-scale measurements were also taken in the cleanroom which was the subject of the modeling exercise.

Ventilation aspects of moisture in buildings: a review and assessment of the future role of prediction techniques.

Outlines some of the principles behind air driven aspects of moisture in buildings and illustrates how calculation methods and mathematical modelling techniques may be used to both predict and remedy associated problems. Primary remedies include a reduction in the generation of moisture, ensuring thermal integrity of the building and providing adequate ventilation. The use of dehumidification may also have a role to play. Mathematical models offer an inexpensive method for assessing design ideas at an early stage of development.

Research project "Moisture distribution in buildings".

This paper reviews the work carried out in the Netherlands on moisture problems. In current air flow simulation models for buildings, moisture transfer and diffusion in and between rooms are not taken into account. The aim of the research project is the development of an integral hygrothermal model in which the above mentioned aspects are incorporated.

Characterization of indoor air pollution.

This is a review paper addressing the current state-of-the-art. Concerns that motivate studies of the indoor environment are reviewed in the introduction. The source and typical diurnal variations of the concentration of several air contaminants are discussed in the section on characterization. A dynamic model is described in the section on indoor air quality modelling. Indoor air pollution control techniques are addressed in the last section.

CAD for air flow optimisation in clean room installations and other controlled environments.

This paper describes the development of a computational air flow modelling technique, and identifies applications within clean room installations. Details are given of a validation exercise in which air flow patterns and velocities for a number of simple 2-dimensional configurations were both measured and predicted. The good agreement between measurements and predictions clearly demonstrates the usefulness of the method.

Final report on the Alberta home heating research facility: results of the 1981-82 heating season and part of the 1982-83 heating season to January 1983.

This study used a constant concentration tracer gas measurement system to measure the air infiltration rate of three modules simulating residential buildings in Canada. The results obtained were compared with computer predictions.

Strategy for measuring infiltration rates in large, multicelled and naturally ventilated buildings using a single tracer gas.

Large, multicelled and naturally ventilated buildings pose many inherent problems for the measurement of overall infiltration rates using tracer gases. Considering a single tracer gas decay technique, the most obvious problems are: (a) local variations in infiltration, (b) imperfect internal mixing of the air, and (c) practical difficulties in distributing (ie, seeding) the tracer gas and subsequently obtaining air samples.

Modelling indoor exposure to natural radiation.

Models have been developed to enable prediction to be made of the dose incurred indoors from gamma radiation and from inhalation of radon decay products. 

Air circulation in buildings by the flow in networks method.

Infiltration heat loss has become more important in the energy loss of modern buildings. It depends on a variety of factors. Computer analysis points to the effect of storey number, ground plan features and exhaust ventilation systems. Different rooms exhibit infiltration heat loss maxima at different outdoor temperatures.

Infiltration and indoor air quality in energy efficient houses in Eugene, Oregon.

Twelve energy-efficient houses in Eugene, Oregon, USA, were measured for effective leakage area using blower door fan pressurization. Air exchange rates over a period of several hours were determined by tracer gas decay analysis.