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DA Silva, F. M. et al. Simplified models for natural ventilation estimates. In: INTERNATIONAL CONFERENCE ON PASSIVE AND LOW ENERGY ARCHITETURE, 18., 2001, Florianópolis. Anais... Florianópolis, 2001. p. 235-240.
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Abstract

Natural ventilation is a wind passive technology and one of the most efficient techniques in the rational use of energy concerning comfort conditions inside buildings for hot and even temperate climates.Furthermore is an essential issue in what concerns air quality. Though specific and good bibliography exists is not as widely used as one can expect because Architects and Engineers find difficult to apply the somewhat random characteristics of the process.The paper presents a first analysis of the wind rhythms (relating them with those from the sun)so that the idea of randomness can be looked upon as an advantage.The pressure forces as arriving from the wind action over buildings are modelled together with thermal actions so that the basic driving forces of internal flow are easily understood.Models for internal airflow are presented in a direct analogy with ducted flows.Final results are simplified models where compatibility between the strength of the flow sources and the characteristics resistance particles find out in their paths is established.A graphical representation of these models is presented so that its main features can be easily accessed when applied to case studies.
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