Natural ventilation is often a highly unsteady phenomenon, therefore steady criteria, very helpful for mechanical systems, cannot be used. This paper presents ideas for evaluating transient flow situations. The theory of the air exchange efficiency is extended to transient flows.
Three flow regimes encountered in hybrid ventilation systems, depending on the external temperature along with the imposed heating and cooling loads, are investigated . A theoretical model is used and small-scale laboratory experiments are visualised. The transitions between those naturally ventilated flows may vary according the seasons.
This paper presents a procedure that allows to look at the influence of atmospheric turbulence in natural ventilation. This procedure uses wind time series. The results of the estimated turbulence influence on air change rates are compared with field measurements both from the references and from the tests conducted in real buildings in order to validate that procedure.
In natural ventilation, the airflows stream in opposite directions. One enters the room while the other leaves it. A neutral zone exists where pressure difference between the inside of the room and the outdoor environment is equal to zero. This paper deals with an experiment conducted with a model of a room in order to investigate the influence of the height of the neutral zone on thermal comfort.
This thesis was based on numerous experiments operated in a full-size cell in order to study ventilation efficiency and thermal comfort associated with several positions of air inlet and outlet, taking into account different sources of disturbance (heating systems, occupants, etc.).
This CD gives information to understand and apply the new French Thermal Regulations RT 2000, which are applicable to new residential and commercial buildings and which mainly concern the calculation of energy consumption of buildings and comparison with reference values.
The CD includes the official texts of the regulations, a slide presentation of the regulations, software tools enabling the user to make sensitivity analysis of the calculation results to various parameters of the building.
The Airinstruct project objective was to understand the thermal performance of ventilated building components, namely ventilated roof, ventilated wall, solar roof and dynamic insulation.
The aim of this workshop organised by BBRI was to identify recent developments in ventilation systems/strategies and to analyse how such innovative systems are at present treated in regulations and how they could be better treated in the future.
This article describes a new system developed and patented by a Belgian firm for air purification, using photocatalysis (UVA radiation + titania dioxide) for VOC and odour removal. Results from degradation tests are presented.
A new room model has been developed and validated in order to be used for the assessment of HVAC sensors, assuming non-homogeneous room conditions and distinguishing between different sensor positions. .
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