Anti-short-circuit device: A new solution for short-circuiting in windcatcher and improvement of natural ventilation performance

Nejat, Payam; Calautit, John Kaiser; Majid, Muhd Zaimi Abd; Hughes, Ben Richard; Jomehzadeh, Fatemeh

doi:10.1016/j.buildenv.2016.05.023

Cited by 43 publications

(17 citation statements)

References 37 publications

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“…As for the influence on thermal comfort and indoor air quality, natural ventilation provides thermal control [9], free cooling [10] and contaminant removal benefits [11]. Finally, it is necessary to review the multiple configurations of building façades [12] and available conditioning devices [13,14]. The main objective of this paper is to present the use of a steady model able to both qualify and quantify available natural ventilation flows applied to the energy retrofitting of urban residential districts.…”

Section: Introductionmentioning

confidence: 99%

Methodology Applied to the Evaluation of Natural Ventilation in Residential Building Retrofits: A Case Study

2017

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Abstract:The primary objective of this paper is to present the use of a steady model that is able to qualify and quantify available natural ventilation flows applied to the energy retrofitting of urban residential districts. In terms of air quality, natural ventilation presents more efficient solutions compared to active systems. This method combines numeric simulations, through the utilization of Ansys Fluent R15.0 ® and Engineering Equation Solver EES ® , with on-site pressurization tests. Testing consists of the application of the seasonal pressure gradient on the building's envelope and the calculation of the ventilation flows in three climatic representative conditions (summer, winter, and annual average). Through the implementation of this methodology to existing buildings it is possible to evaluate the influence of the built environment, as well as key parameters (relative height of the dwelling, number of vertical ventilation ducts, and airtightness of windows) of available natural ventilation.

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Section: Introductionmentioning

confidence: 99%

Methodology Applied to the Evaluation of Natural Ventilation in Residential Building Retrofits: A Case Study

2017

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“…Boundary conditions were set using the guidelines proposed by the Architectural Institute of Japan (AIJ) for practical applications of CFD modelling to urban wind environment around buildings (Tominaga, 2008;Nejat et al, 2016a;Aquino et al, 2017). The dome building was assumed to be located in the city of Yazd, located in the central part of Iran in 31° N latitude, 54° E longitude and 1230m altitude.…”

Section: Boundary Condition Settingsmentioning

confidence: 99%

Climatic analysis of ventilation and thermal performance of a dome building with roof vent

Soleimani

Calautit

et al. 2018

Proceedings of the Institution of Civil Engineers - Engineering

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The paper presents the climatic analysis of a naturally ventilated geodesic-type dome building situated in a hot climate. A comprehensive review of the literature was conducted to provide an overview of previous related research on dome-type roofs buildings. The two-floor geodesic dome building assessed in this study was based on a 3v Icosahedron type and had a roof vent for natural ventilation. The airflow and temperature distributions inside the building were simulated using Computational Fluid Dynamics (CFD) modelling with the standard k-epsilon turbulence model. The computational modelling was verified using sensitivity analysis and flux balance analysis. Validation was carried out by using a similar dome-shaped building model from the literature. The atmospheric boundary layer (ABL) flow was simulated in the computational domain for a more realistic predictions of wind conditions. The thermal comfort level was assessed using the Predicted Mean Vote (PMV) method. The results showed that integration of the roof vents was advantageous and could reduce the indoor temperature and also introduce fresh air particularly during winter. The results also revealed that natural ventilation using roof vents could not satisfy the thermal requirements during summer periods and potential cooling solutions that could be integrated into the system are discussed.

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“…(3) Natural ventilation: To implement nZEB, an architectural design for inducing the reduction of the building energy demand through the effective influx of the outdoor air (i.e., natural ventilation) should be considered in the initial design stage. Generally, natural ventilation can be categorized based on two mechanisms: (i) buoyancy-driven ventilation by the vertical and horizontal temperature difference; and (ii) wind-driven ventilation by the pressure difference between the front and the back of the building (refer to Table 3) [29][30][31][32][33][34][35][36][37][38]. First, there are various previous studies related to buoyancy-driven ventilation [29][30][31][32][33][34].…”

Section: Part A-1: Passive Sustainable Designmentioning

confidence: 99%

“…The dimensionless charts that can determine the combination of design variables were developed as a guideline for realizing natural a ventilated building [30]. Second, there are various previous studies related to wind-driven ventilation [35][36][37][38]. conducted a comparative analysis of the wind-catcher-integrated wing wall (i.e., new design) and the conventional wind catcher via the Computational Fluid Dynamics (CFD) software program and wind tunnel testing.…”

Section: Part A-1: Passive Sustainable Designmentioning

confidence: 99%

Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle

Hong

Kim

et al. 2017

Sustainability

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Abstract:To cope with 'Post-2020', each country set its national greenhouse gas (GHG) emissions reduction target (e.g., South Korea: 37%) below its business-as-usual level by 2030. Toward this end, it is necessary to implement the net-zero energy building (nZEB) in the building sector, which accounts for more than 25% of the national GHG emissions and has a great potential to reduce GHG emissions. In this context, this study conducted a state-of-the-art review of nZEB implementation strategies in terms of passive strategies (i.e., passive sustainable design and energy-saving technique) and active strategies (i.e., renewable energy (RE) and back-up system for RE). Additionally, this study proposed the following advanced strategies for nZEB implementation according to a building's life cycle: (i) integration and optimization of the passive and active strategies in the early phase of a building's life cycle; (ii) real-time monitoring of the energy performance during the usage phase of a building's life cycle. It is expected that this study can help researchers, practitioners, and policymakers understand the overall implementation strategies for realizing nZEB.

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Anti-short-circuit device: A new solution for short-circuiting in windcatcher and improvement of natural ventilation performance

Cited by 43 publications

References 37 publications

Methodology Applied to the Evaluation of Natural Ventilation in Residential Building Retrofits: A Case Study

Methodology Applied to the Evaluation of Natural Ventilation in Residential Building Retrofits: A Case Study

Climatic analysis of ventilation and thermal performance of a dome building with roof vent

Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle

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