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Abstract
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| The main objective of ventilation systems in tunnels is to reach the highest possible safety level both in service and fire situation; being the fire one, the most relevant when designing the system. When designing a longitudinal ventilation system, the methodology to evaluate the capacity of the system is similar both in service and fire situation, with the exception of the chimney effect and the phenomena of thermal transfer which is responsible of the changes in the density of the air. Air density variation concerns all the terms of the momentum equation, but it is of a crucial importance in the case of jet fans effective thrust, that will have to offset the existing head losses and which performance will be reduced due to the temperature increase of the air. When facing the dimensioning task for longitudinal ventilated tunnels, although similar methodologies are used in different countries, specific hypothesis (aerodynamic, thermal properties, traffic) even if discussed in the literature or current practice, are not usually detailed in the regulations or recommendations. The aim of this paper is to propose a probabilistic approach to the problem which would allow the designer, and the tunnel owner, to understand the uncertainty and sensibility adopted in the results and, eventually, identify possible ways of optimizing the ventilation solution to be adopted. | |
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International
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Si |
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Congress
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15th International Symposium on Aerodynamics and Ventilation of Tunnels |
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960 |
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Place
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Barcelona, España |
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Reviewers
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Si |
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ISBN/ISSN
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978-1-85598-137-9 |
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Start Date
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18/09/2013 |
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End Date
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21/09/2013 |
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From page
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1 |
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To page
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13 |
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Proceedings of the 15th International Symposium on Aerodynamics and Ventilation of Tunnels |