English

Displacement ventilation is a method that provides conditioned air to indoor environments with the view to improve air quality whilst reducing energy usage. These systems have been employed in industrial applications, notably in Scandinavia, for many years and have gained in popularity in office building spaces in recent years. Measurements of velocity and temperature fields have been performed in three modern office spaces to analyse the performance of the incorporated displacement ventilation system0>, based on thermal comfort and temperature gradient assessment<2>.

Ventilation is fundamental to indoor air quality. But what kind of ventilation, and how does one respond to heat gains? Nigel Aitkinson considers the issues.

Radon can enter a new extension or conservatory by a number of routes, with the result that radon levels may also increase inside the existing house. This leaflet describes how to minimise  the amount of radon entering the new building, and discusses the additional protective measures it may be necessary to install during its construction. It will be of interest to anyone involved in reducing indoor radon levels.

This document provides an overview of the energy technology and R & D collaboration programme established by the International Energy Agency to facilitate co-operation among IEA member and non-member countries to develop new and improved energy technologies and introduce them into a market. The collaboration programme aims to bring together experts on specific technologies wishing to work on common problems and to share the results of their endeavors.