Wind Driven Ventilation for Enhanced Indoor Air Quality

Lien, Jason; Ahmed, Noor A.

doi:10.5772/17059

Cited by 30 publications

(12 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wind induced cross-ventilation has been utilized in traditional and modern buildings for air-quality improvement (Lien and Ahmed 2011;Heracleous and Michael 2019;Aflaki et al 2019;Aydin and Mirzaei 2016) and building energy reduction (Mochida et al 2006;Mohammadreza Shirzadi, Naghashzadegan, and Mirzaei 2019;Zhang, Mirzaei, and Jones 2018;Ohba and Lun 2010;Lo and Novoselac 2013;Li et al 2014). Different methods are used for analyzing cross-ventilation, including simplified correlations based on the orifice flow theory (Kobayashi et al 2009;Karava, Stathopoulos, and Athienitis 2004;Martins and da Graça 2016), field measurement (H. Park 2013;Mochida et al 2005), wind tunnel measurement (Tominaga and Blocken 2016;Mohammadreza Shirzadi, Tominaga, and Mirzaei 2019c;Katayama, Tsutsumi, and Ishii 1992; C.-R. Chu and Chiang 2014; C. R. Chu, Chiu, and Wang 2010;Tominaga and Blocken 2015;Mohammadreza Shirzadi, Tominaga, and Mirzaei 2019a;S Murakami 1991), and computational fluid dynamics (CFD) (T van Hooff, Blocken, and Tominaga 2017;Twan van Hooff, Blocken, and Tominaga 2016;Mohammadreza Shirzadi, Tominaga, and Mirzaei 2020;Ramponi and Blocken 2012a;James Lo, Banks, and Novoselac 2013;Kosutova et al 2019;Lo 2011;Hua, Ohbab, and Yoshiec 2006;Bazdidi-Tehrani et al 2019).…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of cross-ventilation flow in a group of generic buildings: Comparison between steady RANS, LES and wind tunnel experiments

2020

View full text Add to dashboard Cite

Computational fluid dynamics (CFD) results generated by the steady Reynolds-averaged Navier-Stokes equations (SRANS) model and large eddy simulation (LES) are compared with wind tunnel experiments for investigating a cross-ventilation flow in a group of generic buildings. The mean flow structure and turbulence statistics are compared for SRANS based on different two-equation turbulence models with LES based on the Smagorinsky subgrid-scale turbulence model. The LES results show very close agreement with the experimental results in the prediction of the time-averaged velocity, wind surface pressure around and inside the building, and crossing flow through the openings. In contrast, SRANS fails to predict the most important features of cross-ventilation. LES reproduced well the anisotropic turbulence property around and inside the cross-ventilated building, which is closely related to the transient momentum transfer caused in street canyon flows and has a significant influence on the mean flow structure. In contrast, SRANS could not inherently reproduce such transient fluctuations and anisotropic turbulence property, and it results in low accurate predictions for the time-average velocity components, wind surface pressure distribution and crossing airflow rate up to 100% error.

show abstract

Section: Introductionmentioning

confidence: 99%

CFD analysis of cross-ventilation flow in a group of generic buildings: Comparison between steady RANS, LES and wind tunnel experiments

2020

View full text Add to dashboard Cite

show abstract

“…Lien et al experimental and numerical analysis results indicate that the efficiency and reliability of a turbine ventilator operation may require boosting by hybrid system by incorporating other power sources such as solar power to overcome the inertia and friction forces acting on the body to initiate ventilator rotation at lower wind speed [6]. Lai and found increase of ventilation air flow rate at wind speed up to 5 m/s [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Turbine Ventilators Performance under Different Test Conditions

et al. 2018

View full text Add to dashboard Cite

One of the most popular wind driven ventilation devices is a turbine ventilator. Its main construction components usually are air suction duct and impeller. However, there are many different configurations of such devices – different shape of vanes and ratios between main dimensions. In order to develop turbine ventilators there is demand for deeper fundamental researches. Major part of previous experimental investigations compares turbine ventilators performance. The aim of presented experimental investigation is to understand key parameters affecting wind driven ventilators performance. For this purpose, straight and curved vane devices under 4 different test conditions are tested. All tests are performed in modified wind tunnel based on the following methodology: 1) testing devices under normal operation conditions; 2) testing without impeller; 3) testing while impeller is stopped; 4) testing while air suction duct is sealed. Experimental results have shown that the biggest part of extracted air flow rate is impacted due to ejection of wind and air suction duct interaction process. A slight increase in performance of turbine ventilators compared to open duct column has been confirmed. Experiments also revealed differences between tested turbine ventilators rotational speed trends. Presented empirical equations of experiments could be used for design of turbine ventilators or other researches purposes.

show abstract

“…As costs come down, dish CSP holds great promise to replace unsustainable fossil fuel sources [3]. The present work was, therefore, carried out to compliment the extensive efforts of the authors and their colleagues in the quest to develop various methodologies and flow control technologies towards energy production and usage for a pollution free future [82][83][84][85][86][87][88].…”

Section: Introductionmentioning

confidence: 99%

A Novel Solar Concentrating Dish for Reduced Manufacturing Cost

Cameron¹,

Ahmed

2014

AMM

View full text Add to dashboard Cite

This paper presents a novel solar dish configuration which can attain a high concentration factor and also facilitate substantial on board energy storage while being low in projected manufacturing cost. This is due to minimizing the requirement for extreme rigidity and accuracy in the design, in turn through reducing the cantilever distance from dish to receiver. This is done by using a novel split / recombined focus arrangement, enabling rim angles up to 900, thus bringing the focal point much closer to the dish than standard dishes, which typically use approximately 450. This research is potentially significant for dish Concentrating Solar Power (CSP) in general and other emerging CSP systems that require high concentration factors.

show abstract

Wind Driven Ventilation for Enhanced Indoor Air Quality

Cited by 30 publications

References 24 publications

CFD analysis of cross-ventilation flow in a group of generic buildings: Comparison between steady RANS, LES and wind tunnel experiments

CFD analysis of cross-ventilation flow in a group of generic buildings: Comparison between steady RANS, LES and wind tunnel experiments

Experimental Evaluation of Turbine Ventilators Performance under Different Test Conditions

A Novel Solar Concentrating Dish for Reduced Manufacturing Cost

Contact Info

Product

Resources

About