Balconies are green features commonly used in residential buildings to improve natural ventilation and air quality. Small vents, if mounted with an acoustic silencer, can reduce noise penetration while still allowing natural ventilation to occur. In this study, the computational fluid dynamics method is used to investigate numerically the effect of balconies with small upper and lower vents on the ventilation and air quality of the 4th, 5th and 6th floors of a 10-storey building. The results show that balconies can significantly increase the natural ventilation on these floors and generally have a more positive effect on the improvement of natural ventilation and the reduction in pollutant concentration on the floor on which they are located rather than on the levels above or below.
Practical application: This study will help designers and engineers understand more about the effect of balconies and lower and upper vents on natural ventilation and indoor air quality in buildings. This study will also help them to incorporate with confidence the design of balconies with lower and upper vents.
SantamourisMSynnefaAAsssimakopoulosM. Experimental investigation of the air flow and indoor carbon dioxide concentration in classrooms with intermittent natural ventilation. Energy Build2008; 40: 1833–1843.
2.
CacioloMStabatPMarchioD. Full scale experimental study of single-sided ventilation: analysis of stack and wind effects. Energy Build2011; 43: 1765–1773.
3.
AlloccaCChenQGlicksmanLR. Design analysis of single-sided natural ventilation. Energy Build2002; 35: 785–795.
4.
GanG. Effective depth of fresh air distribution in rooms with single-sided natural ventilation. Energy Build2000; 31: 65–73.
5.
CacioloMStabatPMarchioD. Numerical simulation of single-sided ventilation using RANS and LES and comparison with full-scale experiments. Build Environ2012; 50: 202–213.
6.
ChenQ. Ventilation performance prediction for buildings: a method overview and recent applications. Build Environ2009; 44: 848–858.
7.
AiZTMakCMNiuJL. The effect of balconies on ventilation performance of low-rise buildings. Indoor Built Environ2011; 20(6): 649–660.
8.
MakCMNiuJLLeeCT. A numerical simulation of wing walls using computational fluid dynamics. Energy Build2007; 39: 995–1002.
9.
NiuJL. Some significant environmental issues in high-rise residential building design in urban areas. Energy Build2004; 36: 1259–1263.
10.
MakCMLeungWKJiangGS. Measurement and prediction of road traffic noise at different building floor levels in Hong Kong. Build Serv Eng Res Technol2010; 31(2): 131–139.
11.
BiancaCDAraujoDBistafaSR. Facade elements for natural ventilation and sound insulation. Build Acoust2012; 19(1): 25–43.
12.
MakCMWuJYeC. Flow noise from spoilers in ducts. J Acoust Soc Am2009; 125(6): 3756–3765.
13.
MakCM. A prediction method for aerodynamic sound produced by multiple elements in air ducts. J Sound Vib2005; 287(1-2): 395–403.
14.
ChandIBhargavaPKKrishakNLV. Effect of balconies on ventilation inducing aeromotive force on low-rise buildings. Build Environ1998; 33(6): 385–396.
15.
AiZTMakCMNiuJL. The assessment of the performance of balconies using computational fluid dynamics. Build Serv Eng Res Technol2011; 32(3): 229–243.
16.
FitzgeraldSDWoodsAW. Natural ventilation of a room with vents at multiple levels. Build Environ2004; 39: 505–521.
17.
LomasKJJiY. Resilience of naturally ventilated buildings to climate change: advanced natural ventilation and hospital wards. Energy Build2009; 41: 629–653.
18.
HackerJNSaulles TPDeMinsonAJ. Embodied and operational carbon dioxide emissions from housing: a case study on the effects of thermal mass and climate change. Energy Build2008; 40: 375–384.
19.
ChenQSrebricJ. A procedure for verification, validation, and reporting of indoor environment CFD analyses. HVAC&R Res2002; 8(2): 201–216.
20.
ZhangJSChenQYangX. A critical review on studies of volatile organic compound (VOC) sorption on building materials. ASHRAE Trans2002; 108(1): 162–174.
21.
FunasakaaKMiyazakiaTTsuruhoaK. Relationship between indoor and outdoor carbonaceous particulates in roadside households. Environ Pollut2000; 110: 127–134.
22.
SekharSCGohSE. Thermal comfort and IAQ characteristics of naturally/mechanically ventilated and air-conditioned bedrooms in a hot and humid climate. Build Environ2011; 46: 1905–1916.
23.
NiuJLTungTCW. On-site quantification of re-entry ratio of ventilation exhausts in multi-family residential buildings and implications. Indoor Air2008; 18: 12–26.
24.
ChengYLienFSYeeE. A comparison of large eddy simulations with a standard ɛ−k Reynolds-averaged Navier-Stokes model for the prediction of a fully developed turbulent flow over a matrix of cubes. J Wind Eng Ind Aerodynam2003; 91: 1301–1328.
25.
GaoNPNiuJLPerinoM. The airborne transmission of infection between flats in high-rise residential buildings: tracer gas simulation. Build Environ2008; 43: 1805–1817.
26.
YangTWrightNGEtheridgeDW. A comparison of CFD and full-scale measurements for analysis of natural ventilation. Int J Vent2006; 4: 337–348.
27.
JiangYChenQ. Study of natural ventilation in buildings by large eddy simulation. J Wind Eng Ind Aerodynam2001; 89: 1155–1178.
28.
JiangYAlexanderDJenkinsH. Natural ventilation in buildings: measurement in a wind tunnel and numerical simulation with large-eddy simulation. J Wind Eng Ind Aerodynam2003; 91: 331–353.
29.
ChenFYuSLaiCM. Modeling particle distribution and deposition in indoor environments with a new drift-flux model. Atmos Environ2006; 40: 357–367.
30.
HuntGRLindenPP. The fluid mechanics of natural ventilation—displacement ventilation by buoyancy-driven flows assisted by wind. Build Environ1999; 34(6): 707–720.
