In this thesis, computational modelling and numerical simulations are developed for construction architecture, to make possible project configuration evaluations and testing of possible improvements, both in the pre-occupancy and in the post-occupancy phases, aiming at comfort of building environments. These improvements are introduced here by simple changes to original designs targeting the functional quality increasing of the buildings with low financial and environmental costs.Attention is paid, in this work, to the following comfort variables: air circulation (velocity field), temperature and pollutant concentration, considering radiation, convection and building envelope materials.A coupled mathematical model is presented for velocity, temperature and concentration variables through the conservation equations for mass, momentum, energy and species, and variable boundary conditions can be used.Numerical solutions for the mathematical model are obtained by a stabilyzed mixed finite element method that allows to deal with the diffulties in constructing approximation spaces for problems with internal constraint and non-linearities of the convective type.It is also proposed in this thesis a global circulation index capable of identifying, from the simulation results, the windd intensity by level ranges and by rooms.Changes are proposed to original internal environmentes through openings locations, wall shapes and outdoor volumes placements. Some wind-catcher models, typical from north Africa, are studied, and it is suggested here the potentiality of theis usage in the hot and dry regions of Brazil. The usefulness of this alternative system is also proposed and tested here for some buildings located in the city of Rio de Janeiro.