Investigates a rational method of utilizing recent improvements in wind tunnel techniques and meteorological data, to estimate potential wind-generated air flow through housing in hot humid climates. The method uses mean pressure differences obtained from solid wind tunnel models together with appropriate discharge coefficients for rectangular openings. Changes in pressure distributions due to typical openings through models indicated that the use of pressure data from solid models results in errors similar to those associated with the local wind data.
Reports wind tunnel measurements of the wind-induced internal pressures of models of low-rise buildings of different geometry and internal volume. Three different uniform porosities (0.0 0.5 and 3.0% of the total surface area) have been examined in combination with openings in a wall ranging from 0 to 100% of that wall's area. Two terrain roughnesses were used corresponding to open country and suburban regions.< Finds that internal pressures are variable but generally lower than local external pressures.
Reports experimental measurements carried out in a boundary layer wind tunnel at the University of Western Ontario. Both external and internal pressures on two different models were measured with different porosities for the walls. Discusses results and concludes that mean internal pressures measured in thewind tunnel agree well with analytically predicted values that accurate evaluation of internal pressures is necessary to calculate building air infiltration.
The open ridge is a ventilator commonly used in cattle buildings. Reviews literature on the open ridge. Finds that there is outright disagreement between the sources referenced. Describes wind tunnel study to show whether or not the ridge design could influence the pressure coefficients when subject to wind. Finds there is no practical difference in pressure coefficients generated at the ridge of a building whether there are no upstands, upstands alone or with caps. For a 0deg.
Reports a program of research in progress at the Colorado State University to determine the surface pressures on building models immersed in a simulated atmospheric flow. Pressure data on a model building is taken from 272 tappings and reduced to pressure coefficients. Reports pressure coefficient measurements have been completed for 23 building/boundary layer combinations.
Reports pressure measurements made on five shapes of glasshouses, under natural wind conditions and generally over a 90 deg. range of direction. Gives pressure coefficients from 48 tapping points for four different glasshouses.
Describes apparatus and experimental techniques for full and model scale measurements on test buildings. Discusses "blocking effect" of a large model in a small tunnel. Shows that model law derived in part one is valid forphenomena dependent on wind velocity. Compares model to full-scale tests. Discusses air flow around a house, pressure on walls and different types of roofs
Reports wind-tunnel measurements of wind pressure on a rectangular block. Presents results as mean isobars plotted on an exploded view of the surfaces of the model. Briefly discusses the effect of turbulence and fluctuating pressures. Concludes that mean pressure distribution is only slightly affected by turbulence and shear in the atmospheric wind.
Reports tests of air leakage of windows, made in a wind tunnel. Six different windows were tested, five were of the same design with different manufacturers and materials;two steel, one wood, one aluminium and one cast iron. Gives expression for the airflow through a window. Discusses pressure distribution on buildings and stack effect.
Reports measurements of wind pressure distributions on the surface of a rectangular cylinder model in a wind tunnel. Finds fluctuating character of pressure on roof surface is dependent on the turbulent structure of wind tunnel flow. Experiments were also made on box-shaped models with square section. Finds windpressure distribution on the roof became uniform with increasing height of the model. Gives diagrams of wind pressure coefficients.