This paper aims at developing and implementing a fuzzy controller for naturally ventilated building.The first objective of this research was to develop and then validate a rule based controller which can vary the resistance of ventilation opening in order to maximise comfort conditions.
The effect of a solar chimney along with a solar screen on the effectiveness of natural ventilation is investigated in this paper.The benefit of the combination of both systems is that it enhances the natural ventilation flow through the building and improves the environmental comfort.
This paper presents the results of the performance of a wall-mounted natural ventilation convector under real winter weather conditions. The monitoring results were used as boundary conditions for CFD simulation to investigate the air movement in the test room. The results proved that the convector contributed greatly to the improvement of the indoor air quality.
A newly proposed method for evaluating ventilation performance of various types of window openings is presented with its experimental validation. The experimental system has been designed by means of wind tunnel techniques. The local similarity model of cross-ventilation is used for the application of that method.
This paper is a description of a numerical method that aims at analysing three-dimensional natural convection in rooms with wide openings.A 3D CFD tool is proposed to predict the airflow pattern and the heat and mass transfer inside a heated office room connected to a corridor via a doorway.Results have been compared to experimental data obtained in full-scale : the CFD predictions agree with the experimentally observed features.
Experimental set-up and measurement procedures were carried out to evaluate the performance of a windcatcher, using an open working section wind tunnel. Then CFD simulations were made to be compared with experimental results.The performance of the windcatcher depends on the wind speed. The wind direction also has importance
This paper is built on the hypothesis that, as the heated area increases from a point source, a displacement flow is maintained until the heated area reaches a critical fraction of the floor area, after which there is a transition to mixing flow.This hypothesis is tested in a series of laboratory experiments with the investigation of thermal stratification and flow patterns produced by a range of area heat sources located on the floor of a naturally ventilated enclosure.
Investigation by means of CFD and small-scale laboratory experiments showed that flow bifurcations could occur in building spaces ventilated by buoyancy force with large opening ceiling.A theoretical model has been developed to determine the ceiling opening size at which the flow bifurcation occurs.The predictions were in good agreement with the experimental results obtained in this work.
This paper studies the climatic suitability to natural ventilation, which depends on energy saved for cooling and on the presence of driving forces such as wind and buoyancy. It may be assessed by estimating the distribution of temperature differences : difference between indoor and upper limit of comfort zone temperature for the energy saved, difference between indoor and outdoor temperature for the buoyancy effect.
This paper is a presentation of a detailed mathematical simulation along with an experimental investigation of airflow in solar chimneys carried out with an experimental apparatus whose most of the variables could be changed during the experiments. It is a chimney channel with changeable channel thickness and inclination angle.
The simulation model used proved very useful to simulate solar chimneys performance. It can predict flow rates for a wide range of variables.
Login