The Nucleus Hospital programme has been progressed by the Department of Health for over a decade. The Maidstone District General Hospital was the first project which involved the construction of a complete hospital using the Nucleus design concept. Within a hospital, air movement patterns and air change rates are a prime concern in the case of Maidstone, the interest in these parameters was much greater in view of the fact that a natural ventilation strategy had been chosen for ward units.
Radon is the largest source of risk to human health caused by an indoor pollutant, at least in the industrial countries. Subslab Ventilation (SSV) is one of the most effective and common methods of reducing indoor Rn concentrations in houses with a basement. In this paper, we first quantify the impact of this technique on the air exchange rate, through numerical modeling of a prototype house with basement for a range of permeabilities of soil and subslab aggregate and various sizes of the cracks in the basement floor.
The present paper reports on tracer gas measurements performed in five large buildings during normal operating conditions. In all buildings air was supplied through ceiling diffusers and returned through a ceiling plenum. The measurements were taken during summer with the systems in cooling mode, i.e. the supply temperature was lower than the room temperature. The global air change effectiveness and the occupied zone average air change effectiveness were calculated based on the age-of-air concept.
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