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ABSTRACT. A NEW APPROACH TO PROMOTE NATURAL VENTILATION IN HOUSES, BUILDINGS AND INDUSTRIES IS PRESENTED IN THIS PAPER. IN THE DEVICE PROPOSED IN THIS WORK, THE VENTILATION IS CAUSED BY A PRESSURE DIFFERENCE BETWEEN THE BUILDING INTERIOR (WHICH IS NEARLY EQUAL TO AMBIENT PRESSURE) AND THE BASE REGION OF A BLUFF BODY, WHICH, IN THE PRESENT CASE, IS A FLAT PLATE KEPT NORMAL TO THE WIND VELOCITY DIRECTION. IN SUCH REGION, DOMINATED BY THE FORMATION AND SHEDDING OF LARGE VORTICES, THE PRESSURE IS ALWAYS BELOW AMBIENT VALUE. THE FIRST RESULTS OF AN EXPERIMENTAL RESEARCH ARE PRESENTED IN THIS PAPER. THEY WERE CONDUCTED IN A SMALL WIND TUNNEL AND THE MODEL WAS MADE OF PLASTIC WATER TUBES AND CURVES JOINED TO ALUMINUM FLAT PLATES WITH DIFFERENT DIAMETERS, IN ORDER TO VERIFY THE VARIATIONS OF THE FLOW RATE SUCKED DUE TO CHANGES IN THE BLUFF BODY CHARACTERISTIC DIMENSION (EXTERNAL PLATE DIAMETER). SQUARE PLATES WITH AND WITHOUT END PLATES ARE ALSO ANALYZED. NON DIMENSIONAL AND DIMENSIONAL PARAMETERS ARE USED TO PRESENT THE RESULTS. FINALLY, THE PRESENT NATURAL VENTILATION DEVICE IS COMPARED TO A CHIMNEY, THROUGH A NON-DIMENSIONAL FLOW RATE RATIO.
KEY-WORDS: NATURAL VENTILATION, BLUFF BODY, EXPERIMENTAL TECHNIQUE
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