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A bioclimatic approach to designing comfortable buildings in hot and humidtropical regions requires, firstly, some preliminary, important work on thebuilding envelope to limit the energy contributions, and secondly, an airflowoptimization of the building. For the first step, tools such as nodal or zonalmodels have been largely implemented. For the second step, the assessment ofair velocities, in three dimensions and in a large space, can only be performedthrough the use of detailed models such as with CFD. This paper deals with theimprovement of thermal comfort by ventilating around the occupants. For thispurpose, the average velocity coefficient definition is modified to be adaptedto CFD and the areas involving movement or the living spaces. We propose a newapproach based on the derivation of a new quantity: the well-ventilatedpercentage of a living space. The well-ventilated percentage of a space allowsa time analysis of the aeraulic behaviour of the building in its environment.These percentages can be over a period such as one day, a season or a year.These kinds of results are helpful for an architect to configure the rooms of ahouse according to their uses, the environment, the architectural choices andthe constraints related to the design of bioclimatic buildings.

A numerical approach to evaluating what percentage of a living space is well-ventilated, for the assessment of thermal comfort