Enhanced single-sided ventilation with overhang in buildings

Jinsoo Park, Jung-il Choi, Gwang Hoon Rhee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number122
JournalEnergies
Volume9
Issue number3
DOIs
Publication statusPublished - 2016 Mar 1

Fingerprint

Ventilation
Wind Speed
Flow Separation
Buildings
Flow separation
Unsteady Flow
Energy Efficient
Turbulent Flow
Turbulent flow
Vortex
Vortex flow
Numerical Simulation
Numerical Results
Three-dimensional
Computer simulation
Air

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Cite this

Park, Jinsoo ; Choi, Jung-il ; Rhee, Gwang Hoon. / Enhanced single-sided ventilation with overhang in buildings. In: Energies. 2016 ; Vol. 9, No. 3.
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Enhanced single-sided ventilation with overhang in buildings. / Park, Jinsoo; Choi, Jung-il; Rhee, Gwang Hoon.

In: Energies, Vol. 9, No. 3, 122, 01.03.2016.

Research output: Contribution to journalArticle

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AB - 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.

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