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Alberto Meiss


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Journal of Zhejiang University SCIENCE A 2018 Vol.19 No.10 P.796-810


A new application model of building ventilation with light shafts: a proposal based on case study assessment

Author(s):  Miguel Ángel Padilla-Marcos, Alberto Meiss, Jesús Feijó-Muñoz

Affiliation(s):  Research Group of Architecture & Energy, Universidad de Valladolid, Valladolid 47014, Spain

Corresponding email(s):   miguelangel.padilla@uva.es

Key Words:  Outdoor air quality, Light shaft, Natural ventilation, Computation fluid dynamics (CFD), Air change efficiency

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Miguel Ángel Padilla-Marcos, Alberto Meiss, Jesús Feijó-Muñoz. A new application model of building ventilation with light shafts: a proposal based on case study assessment[J]. Journal of Zhejiang University Science A, 2018, 19(10): 796-810.

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DOI - 10.1631/jzus.A1700258

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

目的:1. 探究如何在有限的室外空间下简便地计算换气质量; 2. 建立利用采光井进行建筑通风的应用模型.
创新点:1. 案例研究评估的成熟方法论应用; 2. 得到采光井对室内空气通风促进度的速算图表.
方法:1. 采用风洞分析的两步确认法; 2. 对实际采光井模型进行计算流体动力学应用.
结论:1. 高长比小于3的采光井表现出了不错的换气能力; 2. 对空气质量要求更高的居住空间(如卧室和起居室)而言,室内通风口必须被设在高度低于24米的采光井的上半部分或者其他采光井中距离顶部12米以内的位置.


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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