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Descripción
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| The aim of a road tunnel ventilation system is to reach the highest safety levels both in fire and service situations. In the first case, the atmosphere of the tunnel must be in a suitable condition of comfort and safety for the users; assuring the dilution of the pollutants from the vehicles to admissible limits, and allowing a suitable reaction capacity in case of a quick demand of flow. On the other hand, in case of fire the goals should be to control the smoke layer as far from the users as possible, to avoid the spreading of the incident to zones not implied in the fire and to support in rescue tasks. When studying a longitudinal ventilation system, the method to evaluate the capacity of the system is basically the same both in service and fire situation, with the exception of the chimney effect and the phenomena of thermal transfer which it?s the responsible of the changes in the air density which will be no longer constant. This thermal transfer concerns all the effects of the balance equation, but it is of a special importance for the jet fans that will have to offset the existing losses along the whole tunnel; and which performance will be decrease due to the temperature?s increase of the air. The aim of this study is to provide a simplified one-dimensional method to estimate the sizing of a longitudinal ventilation system based on jet fans, which could be of help for designers or educational purposes. | |
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Internacional
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No |
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Nombre congreso
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Issues on Mechanical and Civil Engineering |
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Tipo de participación
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960 |
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Lugar del congreso
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Madrid |
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Revisores
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Si |
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ISBN o ISSN
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978-84-939196-7-2 |
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DOI
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Fecha inicio congreso
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16/11/2012 |
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Fecha fin congreso
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16/11/2012 |
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Desde la página
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415 |
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Hasta la página
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424 |
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Título de las actas
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Issues on Mechanical and Civil Engineering |