AIVC - Air Infiltration and Ventilation Centre

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mathematical modelling

Research into air flows, heating systems and ventilation

Use of computers for simulation of air flows in buildings, leading to production of a mathematical model for analysing the stability of ventilation systems subjected to external forces, and for simulation of heating systems toproduce a mathematical model of heat release and water flow in radiator systems. Investigation of fire ventilation.

Analysis of low particulate size concentration levels in office environments

Simulation methods and test results are presented here to confirm projections of actual total suspended particulate (TSP) concentration levels for representative office buildings, with particular emphasis on the 0.3 to 5 micron particulate si

Pressure fluctuations on a square building model in boundary layer flows

Spatio-temporal measurements of a fluctuating pressure field acting on the side faces of a square prism of finite height in boundary-layer flows are presented for a zero degree angle of attack. Two typical neutral atmospheric flow conditions

A mathematical model of indoor air pollution due to formaldehyde from urea-formaldehyde glued particle boards.

Presents a mathematical model of the formaldehyde concentrations in rooms containing particle boards with known emission rates of formaldehyde. Tests the model in 3 rooms in a new house. Finds agreement within +-15% between calculated and measured formaldehyde concentrations in the rooms before painting and without furniture, carpets etc. Concludes that the combined mathematical model and the analytical method may be suitable for the classification of particle boards according to their emission of formaldehyde and for predictions of formaldehyde concentrations in the indoor environment.

Radon in dwellings - a method for the calculation of radon daughter contents in the building. Radon i bostader. Metod for berakning av radondotterhalter i bostader.

Describes a mathematical model for the calculation of the expected values of radon and radon daughter concentrations in indoor air. Presupposes that it is possible to obtain or measure the parameters necessary for the calculation eg the radon emanation of the building material, the radon content of the soil air, and the leakage of air from the soil into the building. Research in these areas is in progress both in Sweden and abroad.

An overview of ventilation research in large non-residential buildings.

A short treatment of the concepts and aspects that play a role in ventilation is followed by a brief description of the investigation methods employed. Gives a concise survey of the equipment and mathematical models used. Reviews the ventilation research carried out by the IMG-TNO. Covers factories, laboratories, hospitals, auction halls and similar buildings.

Thermal performance of residential attic insulation.

Describes a series of experiments performed on a residential attic under controlled laboratory experiments to obtain a better understanding of attics and attic insulation. Studies type and level of ceiling insulation, mean temperature and heat flow direction (summer v winter) and ventilation rate Describes the experimental set-up and the weather conditions simulated. Gives details of the mathematical models of thermal performance that are developed from finite difference analyses of the ceiling-insulation system. Compares experimental results with the predictions of these models.

HOTCAN - A computer program for estimating the space heating requirements of residences.

Lists the HOTCAN computer program devised for use in the Division of Building Research (NRC) program on low energy houses. It is written in BASIC and is capable of estimating the space heating requirements of residences. Gives basic equations and assumptions, and weather data required, along with a listing of the program and a sample run.

Ventilation in buildings - calculation methods. Luftungsverluste in Gebauden - Berchnungsmethode.

Describes a mathematical model for the detailed calculation of ventilation losses in buildings. The model takes account of the prevailing wind and buoyancy forces, the leakiness of the building facades and internal doors and the effect of exhaust installations. Derives a simplified calculation method for practical calculations by heating engineers which is applied in the new SIA Recommendation 384/2 "Heat demand of buildings".

Mark XI energy research project. Summary of results 1978-1981.

Reports on a study carried out by HUDAC and DBR on four identical detached houses built in Ontario in 1977. House 1 was built according to the insulation requirements of the 1975 Ontario Building Code, the others were constructed with increased levels of insulation and air tightness. Some of the aims are: