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FEASIBILITY OF LOW COST VENTILATION TECHNIQUES
STANFORD RESEARCH INST MENLO PARK CA
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The specific objective of the work project was to evaluate the use of a punkah to distribute air within a fallout shelter and to determine its flow characteristics. The punkah is an oscillating panel, with a series of simple one-way valves, that can be hung from a ceiling or in an open doorway. In the experiments, the punkah was used not only to distribute air within a room, but also to move air from one room to another. Punkahs were tried in various parts of the rooms that comprised the experimental shelter, and various paneling configurations for improving the air delivery were investigated. Of special interest was the problem of ventilating a dead-end compartment, this being the most difficult type of room to ventilate because its only air inlet is a single inside doorway. The internal heat load provided was all sensible heat. Dry- bulb temperature readings were taken at six room levels to evaluate the cooling effect of the punkah. The punkah was capable of ventilating a dead-end room and also of mixing the air within such a room sufficiently to maintain a climatic condition very near to that of the adjacent room. Flow tests were made on the half-door sized punkah. For purposes of controlling flow and providing measurements of velocity and pressure, tests were performed using a ducted housing. Performance curves for the punkah operating in four different modes were developed.
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