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Abstract: There is a lack of studies concerning both the quality of air entering buildings from light shafts and its impact on energy consumption. A combined isothermal analysis of several factors such as urban environment and wind, along with the dimensional conditions of the building, facilitated the assessment of the light shaft to promote air change. The aim of this study was on the impact of architectural design on the quality of the incoming air from light shafts. The capacity of light shafts to provide air change with urban air was evaluated using the concept of air change efficiency. This is determined by the environment, the dimensions, and the proportions of the building containing a light shaft. These were simulated using computation fluid dynamics (CFD) techniques which were experimentally validated. This concept requires the definition of an ideal control domain for comparative evaluation in different cases. For the case studies evaluated, it was verified through numerical analysis that the longer the light shaft in the wind direction was, the better the air change efficiency. It was confirmed that light shafts up to 12 m high and with height/length (H/L) rates lower than 3 were those achieving the best efficiency. The study provided several evaluation tools of a design of this type of outdoor space according to the criteria of air change content. An equation is presented defining the value of the air change efficiency for the outline of architectural design strategies intended for buildings with air shafts.

The paper entitled "An application model for the ventilation of buildings with light shafts. Proposal based on a study of cases" investigates the ability of the light shaft to produce the air change under isothermal conditions. The aim focuses on the impact of architecture in the quality of the incoming air from light shafts. The capacity of light shafts to promote the air change with urban air is evaluated using the concept of air change efficiency. It is numerically verified that the longer the light shaft in the wind direction is, the better the air change efficiency is compared with other options. It is confirmed that the light shafts up to 12 meters high with rates height/length (H/L) lower than 3 are the ones that obtain the best efficiency results. An equation that approximates the value of the air change efficiency for the definition of the strategies of architectural design of buildings with air shafts is presented.

利用采光井进行建筑通风的新型应用模型: 基于案例研究评估的建议

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