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We describe the results of simple modelling and some laboratory experiments of the natural ventilation flows which can develop in an office building when air is supplied from a central atrium, passes through the floor-space of the building, and then vents through stacks at the perimeter of the building.

The aiflows driven by a revolving door that links two rooms of initially uniform temperature are examined. Two situations are considered, the first in which the rooms are at equal temperature, and the second in which there is a temperature difference between the rooms.
The flows were examined using a small-scale model of a revolving door and with fresh- and
salt-water solutions to represent temperature differences. The results presented herein reveal
how the transfer of air across a revolving doorway depends on the rotation rate and temperature

A comprehensive modelling of a compact double skin facade equipped with a venetian blind is proposed here. The modelling is done using CFD approach to asses the air movement inside the ventilated facade channel and appropriate radiation model for long and short wave exchanges. The impact of solar radiation on temperature and velocity fields as a function of some parameters such as beam radiation incidence angle, blade angle of solar protection, etc. is analysed.

In this study, the effect of the thermal mass and thermal insulation of a ventilated building onthe indoor environment is investigated. A simplified model of the thermal interaction between a building structure and the interior is developed. Three important parameters are determined, and analytic expressions for the attenuation and phase lag of harmonic external forcing are derived for an unventilated interior. The effect of forced or stack-driven natural ventilation on the interior response is then investigated.

The contribution deals with the research on temperature fields in rooms heated in differentways at heating-up as well as in steady state conditions. The investigations are being carried out byphysical modelling with the use of interferometry, numerical modelling as well as measuring real rooms by thermocouples. The results show that interferometric research of two-dimensional temperature fields can be used for modelling in smaller heated rooms, in cars and various air-conditioned boxes. Numerical modelling seems to be more effective and can be used in wider range of application.

We present in this paper an advanced formulation of zonal models for calculating room airtemperature and airflow distributions. It is based on a new way of sub-dividing the room usings the Octree method. It allows us to obtain a partitioning based on airflow patterns. The behaviour of the room is represented by the connection of SPARK calculation objects according to its partitioning. The SPARKs objects represent sub-zones of the room or interfaces between sub-zones. We developed an automatic generator of zonal models.

This paper presents an exploratory study on flow pattern selection in unmixed flows, resulting in aset of rules that are used to decide between flow regime during and before a simulation. The development of this set of decision rules had several goals: to define simple criteria to distinguish between flows, to assist non-expert users in the selection of the correct flow pattern model and finally to automate the choice of models during numerical simulations in energy simulation software.

This paper presents a simple model for vertical temperature profile and heat transfer predictionin displacement ventilation. The fully-mixed room air approximation that is currently used in most whole building analysis tools is extended to a three node approach, with the purpose of obtaining a first order precision model for displacement ventilation systems. The use of three nodes allows for improved prediction of thermal comfort and overall building energy performance in low energy cooling strategies that make use of unmixed stratified ventilation flows.

The behaviour of solid contaminants in air flow is important for identifying those in variouslocations in ventilated space. The main reason for this study is to find out where different-sized particles can be found in a room using a simple particle-settling model. In this investigation two distinctive particle sizes are considered, i.e. 0.5 m and 10 m. Additionally, two different ventilation configurations are used to examine how this influences the particle concentration.

This paper outlines the extension of a CFD model using DBM modelling approach. Primarily adynamic CFD model is proposed for adiabatic ventilation system. At the inlet a step rise in temperature of the incoming air with steady flow rate is used for the CFD simulation and temperature responses at 36 monitoring locations were extracted. In the second stage, the inlet and the extracted temperature profiles were used to develop DBM models at individual locations. Finally the developed compact DBM model was used to construct model based predictive control algorithm.