J. A. Gil Saraiva

AN EROSION TECHNIQUE FOR ASSESSING GROUND LEVEL WINDS

Previous research as well as practical evidence has shown that due attention should be given to ground level wind effects produced in the vicinity of tall buildings. An experimental method suitable for use as a wind tunnel technique is presented and some typical results shown. The method is based on the erosion patterns formed by the saltation of fine grains of sand uniformly spread on a smooth ground plate.

Wind action and temperature difference effects on the ventilation rate and internal pressure of two communicating low-rise buildings

Abstract In this paper an analytical model for the prediction of ventilation rates, internal pressures and temperatures as influenced by the combined effects of heat dissipation inside industrial buildings and natural wind action is presented. The model inputs are external pressure distribution, pressure drop coefficients of the openings and thermal conductance of the walls and roof assumed to be known from experimental data. A simple example is worked out. It consists of a two-span long building, equipped with a natural ventilation system and limiting two internal spaces differntly heated. The results emphasize the relative importance of thermal and dynamical variables, including wind incidence and the role of the opening in the internal partition wall.

Ventilation rates of two communicating low rise buildings as affected by terrain roughness

Abstract In this paper an analytical model for the prediction of ventilation rates and internal temperatures as influenced by the combined effects of heat dissipation inside industrial buildings and natural wind action is applied to a simple example of practical importance. It consists in a two span low building equipped with a natural ventilation system and limiting two internal spaces differently heated. The results emphasize the relative importance of thermal and dynamic variables including wind incidence, terrain roughness and the role of the opening in the internal partition wall.