Using CFD to Evaluate Natural Ventilation through a 3D Parametric Modeling Approach

Sakiyama, Nayara Rodrigues Marques; Frick, Jürgen; Béjat, Timea; Garrecht, Harald

doi:10.3390/en14082197

Cited by 24 publications

(11 citation statements)

References 86 publications

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“…The urban built intensity determines the ventilation efficiency of the ventilation path [ 35 , 36 ]. As a morphological characteristic of the built environment, the urban built intensity has an obvious correlation with ventilation potential [ 37 , 38 ]. The characteristics have significance for urban planning.…”

Section: Discussionmentioning

confidence: 99%

The Ventilation Efficiency of Urban Built Intensity and Ventilation Path Identification: A Case Study of Wuhan

Yin

Zhan

Tayyab

et al. 2021

IJERPH

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Urban ventilation is being hampered by rough surfaces in dense urban areas, and the microclimate and air quality of the urban built environment are not ideal. Identifying urban ventilation paths is helpful to save energy, reduce emissions, and improve the urban ecological environment. Wuhan is the capital city of Hubei, and it has a high urban built intensity and hot summers. Taking Wuhan city, with a size of 35 km ×50 km, as an example, the built environment was divided into grids of 100 m × 100 m and included the building density, floor area ratio, and average building height. The ventilation mechanism of the urban built intensity index has previously been explained. The decrease in building density is not the sole factor causing an increase in wind speed; the enclosure and width of the ventilation path and the height of the front building are also influential. Twelve urban built units were selected for CFD numerical simulation. The ventilation efficiency of each grid was evaluated by calculating the wind speed ratio, maximum wind speed, average wind speed, and area ratio of strong wind. The relationship between the urban built intensity index and ventilation efficiency index was established using the factor analysis method and the Pearson correlation coefficient; building density and average building height are the most critical indexes of ventilation potential. In addition, the layout of the building also has an important impact on ventilation. A suitable built environment is that in which the building density is less than 30%, the average building height is greater than 15 m, and the floor area ratio is greater than 1.5. The urban built intensity map was weighted to identify urban ventilation paths. The paper provides a quantitative reference for scientific planning and design of the urban spatial form to improve ventilation.

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Section: Discussionmentioning

confidence: 99%

The Ventilation Efficiency of Urban Built Intensity and Ventilation Path Identification: A Case Study of Wuhan

Yin

Zhan

Tayyab

et al. 2021

IJERPH

View full text Add to dashboard Cite

show abstract

“…In order to be efficient, the approach must deliver the airflow required to meet the indoor air quality criteria and external air thermal comfort parameters. However, natural ventilation is very variable, due to the climate force of wind (wind effect) and temperature (stack effect), which is an essential element for evaluating natural ventilation rates [46]. Envelope design is an important factor in deciding the energy usage in service of a building, and choices on its components often play a critical role in the energy costs needed for cooling as well as the necessary passive cooling [33].…”

Section: Experimental Study Methodsmentioning

confidence: 99%

Eco-lodging as a Solution for Sustainable Ecotourism Development in Al-Fayoum Egypt: Indoor Air Quality Simulation

بسيوني

مسعد

هاني

2021

الدورية العلمية لکلية الفنون الجميلة

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Ecotourism development provides opportunities to diversify the tourist base, particularly in desert areas such as Egypt's Al-Fayoum Oasis. Therefore, the study's aim is to enhance Ecotourism in Al-Fayoum, Tunis Village, by providing environmental Eco-lodges, which are an important aspect of sustainable ecotourism development process. Thus, the study investigates three successful examples for Eco-lodges that clarify key principles for Eco-lodging design guidelines with respect to pillars of sustainability. Moreover, a concluded framework is proposed as assessment tool for new or renovated Eco-lodges in Al-Fayoum. The study focuses on Tunis village Eco-lodges' rooms indoor air quality and the excessive use of air-condition units, therefore the study examines the natural cross-ventilation airflow circulation system for two Eco-lodge's indoor rooms using Ansys Fluids/ computational fluid dynamics (CFD) simulation program. The simulation embodied the indoor air movement of each room thus the final configurations of contour lines of parameters, such as velocity and pressure, are observed. Based on simulation results, Kom El-Dikka is estimated to provide for approximately 57% of total internal ventilation performance, whereas Zad El-Mosafer accounts for around 42%, implying that the Kom El-Dikka room is better ventilated. The study proposes recommendations for optimizing thermal comfort in Ecolodges in Al-Fayoum through natural ventilation patterns.

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“…Moreover, the complete settings of the E+ model, including the occupancy schedule and the .idf file, are available in the Data in Brief article [93]. Based on a one-week monitoring campaign (19-25 August 2014), an E+ numerical model was created, calibrated, and used to perform annual energy and natural ventilation assessments in [91,92], which also provide a detailed description of the measurement equipment, experimental protocol, construction, and the climatic data recorded on-site and used at the simulation. Moreover, the complete settings of the E+ model, including the occupancy schedule and the .idf file, are available in the Data in Brief article [93].…”

Section: Base-case Building Modelmentioning

confidence: 99%

Building Optimization through a Parametric Design Platform: Using Sensitivity Analysis to Improve a Radial-Based Algorithm Performance

et al. 2021

Self Cite

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Performance-based design using computational and parametric optimization is an effective strategy to solve the multiobjective problems typical of building design. In this sense, this study investigates the developing process of parametric modeling and optimization of a naturally ventilated house located in a region with well-defined seasons. Its purpose is to improve its thermal comfort during the cooling period by maximizing Natural Ventilation Effectiveness (NVE) and diminishing annual building energy demand, namely Total Cooling Loads (TCL) and Total Heating Loads (THL). Following a structured workflow, divided into (i) model setting, (ii) Sensitivity Analyses (SA), and (iii) Multiobjective Optimization (MOO), the process is straightforwardly implemented through a 3D parametric modeling platform. After building set up, the input variables number is firstly reduced with SA, and the last step runs with an innovative model-based optimization algorithm (RBFOpt), particularly appropriate for time-intensive performance simulations. The impact of design variables on the three-performance metrics is comprehensively discussed, with a direct relationship between NVE and TCL. MOO results indicate a great potential for natural ventilation and heating energy savings for the residential building set as a reference, showing an improvement between 14–87% and 26–34% for NVE and THL, respectively. The approach meets the current environmental demands related to reducing energy consumption and CO2 emissions, which include passive design implementations, such as natural or hybrid ventilation. Moreover, the design solutions and building orientation, window-to-wall ratio, and envelope properties could be used as guidance in similar typologies and climates. Finally, the adopted framework configures a practical and replicable approach for studies aiming to develop high-performance buildings through MOO.

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Using CFD to Evaluate Natural Ventilation through a 3D Parametric Modeling Approach

Cited by 24 publications

References 86 publications

The Ventilation Efficiency of Urban Built Intensity and Ventilation Path Identification: A Case Study of Wuhan

The Ventilation Efficiency of Urban Built Intensity and Ventilation Path Identification: A Case Study of Wuhan

Eco-lodging as a Solution for Sustainable Ecotourism Development in Al-Fayoum Egypt: Indoor Air Quality Simulation

Building Optimization through a Parametric Design Platform: Using Sensitivity Analysis to Improve a Radial-Based Algorithm Performance

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