AIVC - Air Infiltration and Ventilation Centre

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mathematical modelling

Computer simulation of wind flow around buildings.

Describes the relationship between wind flow round a building and heat loss from it. The relative merits of numerical and wind tunnel models are discussed and various numerical techniques, including the vortex method and the control volume method, are examined.

Natural ventilation of parking garages.

A combination of a wind-tunnel investigation and a mathematical simulation technique conducted on models of two-storey parking garage situated beneath alarge block of buildings (consisting of houses, shopping centre and offices) shows that wind penetrating the partly open garage facades can provide sufficient ventilation. Studies the effects on ventilation of varying the open area of the facades and of fitting openings in the garage roofs. Measures the effect of such ventilation means on air quality close to buildings.

Numerical modelling of a low concentration chemical species or contaminant in a ventilated, heated, two-dimensional room.

Numerically predicts air quality and thermal comfort in 2-dimensional ventilated air spaces of several geometries when conditions on the various room surfaces are taken to be either adiabatic or constant temperature. 

Influence of different parameters on infiltration and infiltration heat loss.

This parameter study with the IMG calculation model for ventilation is an attempt at forming some background for decisions relating to the preparation of a standard in the Netherlands. From the results one can see that air tightness and the heat loss caused by infiltration cannot be considered as a simple linear relationship .

Natural ventilation of auction halls in Bleiswijk, the Netherlands.

TNO Research Institute for Environmental Hygiene have developed a mathematical model (based on an electrical analogue model) for deciding on the best ventilation system (natural v. mechanical) for a building while it is still atthe design stage. This model has been applied to an auction complex situated at Bleiwijk to deduce the best ventilation system for the building. Conclusions are that a natural ventilation system can be realized by placing ventilating devices exclusively in the roof.

Operating experience with a residential mechanical ventilation system with heat recovery.

Assesses the efficacy of an engineered mechanical ventilation system in controlling indoor humidity in one of the HUDAC Mark XI houses. Develops a mathematical model of the home, which is used to demonstrate the interaction between outdoor humidity, infiltration and ventilation rates, and indoor moisture generation and their influence on indoor humidity levels. Discusses the operating effectiveness of the rotary heat exchanger and the energy saved through its use.

Simplified heating and cooling energy analysis calculations for residential applications.

Demonstrates a simplified energy calculation procedure (suitable for a handheld calculator) developed for the evaluation of home retrofitting with respect to energy conservation. 

Calculating energy utilization in residential housing.

The aim of this research effort was to develop a mathematical model and digital computer program for accurately calculating the energy required by residential housing units. This model was used to establish an accurate procedure for determining the monthly and seasonal energy requirements of alltypes of residential structures. The mathematical model and digital computer program developed were verified by extensive calculations and field measurements applied to nine residential dwelling units.

Room flow tests in a reduced scale.

The study concerns the problems and prediction of room flow in air-conditioning. It is shown how difficult it is to form mathematical models, especially of the three-dimensional flow field occurring in practice. After basic definitions, an explanation of the influence of different air flow systems on the structure of room flow is given. The microstructure of the flowis so complex that a precise mathematical model formation seems to be impossible. Measurements on isothermal and models(reduced from the original)supply reliable three-dimensional results.

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