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Energies 2016, 9(3), 122;

Enhanced Single-Sided Ventilation with Overhang in Buildings

Department of Energy and Environment System Engineering, University of Seoul, Seoul 02504, Korea
Department of Computational Science and Engineering, Yonsei University, Seoul 03722, Korea
Department of Mechanical and Information Engineering, University of Seoul, Seoul 02504, Korea
Author to whom correspondence should be addressed.
Academic Editor: Nyuk Hien Wong
Received: 1 January 2016 / Revised: 3 February 2016 / Accepted: 15 February 2016 / Published: 23 February 2016
(This article belongs to the Special Issue Energy Efficient Building Design 2016)
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Enhancing the ventilation performance of energy-efficient buildings with single-sided openings is important because their ventilation performance is poor and strongly depends on the wind conditions. We considered an overhang as a potential building façade for improving the single-sided ventilation performance. We performed numerical simulations of three-dimensional unsteady turbulent flows over an idealized building with an overhang in order to investigate the effect of the overhang on the ventilation performance. Parametric studies were systematically carried out where the overhang length, wind speed, and wind direction were varied. The numerical results showed that the overhang drastically enhanced the ventilation rate in the windward direction regardless of the wind speed. This is because, for windward cases, the overhang produces a vortex with strong flow separation near the tip of the overhang, which promotes a net airflow exchange at the entrance and increases the ventilation rate. However, the ventilation rates for the leeward and side cases are slightly decreased with the overhang. Using an overhang with single-sided ventilation greatly reduces the local mean age of air (LMA) in the windward direction but increases it in the leeward direction. View Full-Text
Keywords: single-sided ventilation; overhang; ventilation rate; local mean age of air (LMA); unsteady Reynolds-averaged Navier-Stokes (URANS) single-sided ventilation; overhang; ventilation rate; local mean age of air (LMA); unsteady Reynolds-averaged Navier-Stokes (URANS)

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Park, J.; Choi, J.-I.; Rhee, G.H. Enhanced Single-Sided Ventilation with Overhang in Buildings. Energies 2016, 9, 122.

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