Over the years there has been significant advance in the development of experimental methods and analysis for the use of tracer gases in the evaluation of ventilation systems. As a rule, these advances have been in the direction of greater complexity and more sophisticated data analysis methods. Most of these advances are difficult for buildings researchers to understand, not to mention the confusion they have created for practitioners.
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.
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