PR2001

The aim is to develop a new method for comfort in settings with high thermal load in buildings that do not require continuous cooling but cooling only during shorter periods. Example of such buildings is schools. The present ventilation and control systems are designed for supply of air at a constant flowrate or to respond to relatively slow variations in load or step changes in load. The slow variations in load are mainly governed by the diurnal cycle and sudden step changes in load are mainly due to people entering or leaving a room.

Thermal bridges are the typical locations for moisture and mould problems in buildings. Low surface temperatures in combination with a high humidity level in buildings can lead to severe problems and complaints by the occupants. Thermal bridges lead also to a significant increase of the energy losses in well insulated buildings. At present, thermal bridge problems still frequently occur in new buildings but especially in rehabilitation projects. In several countries so-called thermal bridge atlases already exist.

For over 20 years, the AIVC has been a key player in developments in technical knowledge on ventilation and related issues, and has always been very active in the dissemination of information. Since its creation in 1979, there has been a substantial change in the users' expectations of how information on ventilation knowledge should be disseminated. The AIVC has always tried to adapt its strategies to these evolving needs. In the first part of this paper, a brief historic overview is made. It is followed by a more extensive discussion of our envisaged new approach.

Ventilation performances in existing buildings are not well known, in France. They are not often checked. This paper shows how a method for checking the performance of ventilation could be applied in France. Such a method, mainly based on visual inspections and simple measurements has already been used for years in Sweden. The Swedish method has been tested in France, in collaboration with a Swedish inspector, on different commercial buildings of different sizes and ages : two secondary schools, one primary school, one office building, one hotel and one bar.

The "Intelligent Facade" is seen as a central element in the evolution of building form and building fabric to provice environmental control and comfort. Describes the background of bioclimatic architecture and goes on to give an outline of the subject of intelligent skins for buildings. Provides two examples of the case study review which has been performed.

This paper is an overview of the work carried out during a 3year EPSRC funded project investigating the important factors in Supply Air window design. The structure and some of the main conclusions of this work are presented here. The project consisted of alternating experimental and simulation phases; the experimental results contributed to the model validation, and the simulation outputs provided design guidance for the following experiments.

Building-integrated photovoltaic (PV) systems are increasingly common in developed countries and have the potential to contribute significantly to electricity generation as a benign alternative to fossil fuel generation. The University of Nottingham has recently completed a new campus, The Jubilee Campus. PVs are integrated into the roofs of four atria for the teaching buildings in the new campus. This paper presents the performance of roof-integrated PVs using CFD (computational fluid dynamics).

In this study a parametric analysis was carried out of the interaction between louvres and various perforated mesh screens. This type of arrangement is common in through-the-wall ventilators used for natural ventilation in buildings. An airflow testing rig was used to examine the impact on louvre airflow performance of the meshes. The interaction of louvre geometries and blade inclinations with meshes of different hole sizes was also investigated experimentally.

It is expected that there will be in 2003 an energy performance regulation for the Flemish Region. In the framework of the VLIET-EPIGOON project, a proposal for such legislation is under preparation. This paper describes the global context for the envisaged regulation. Moreover, a number of specific issues are briefly presented.

European project pr EN13465 from CEN TC 156/WG2/AH4 gives a monozone model for airflow calculations in dwellings. In order to apply it to natural ventilation systems with adjacent ducts used in dwellings in France, we need to address several issues. First, in adjacent ducts, airflows at each level depend on pressions in the different dwellings. We have to solve by iteration the balanced equation proposed in AH4. Then, cowls and roof outlet performances as well as the wind-pressure coefficient on the roof must be known.