Abstract
This study investigates the effect of opening position on the indoor airflow of a natural ventilated isolated building model. Furthermore, the opening configuration which generate the highest ventilation is to be determined. Seven different opening configurations were considered by varying the opening position on the windward and leeward walls which include three cases of aligned openings and four non-aligned openings. Models with different opening position were simulated using Computational Fluid Dynamics (CFD) with 3D RANS turbulence model Shear Stress Transport (SST) k- ω. Simulation result indicates the indoor air velocity as well as pressure distribution highly depends on both inlet and outlet opening positioning. Different opening configuration influences the recirculation zone generated within the building model. Comparison shows openings located near the roof generate 6.52% higher ventilation rate compared to openings located near the ground. The study concludes that opening position holds a crucial role in affecting internal airflow pattern, air recirculation and ventilation rate for a natural cross ventilated building.
Highlights
IntroductionThe excess use of mechanical ventilation to maintain thermal comfort has become one of the causes of global warming [1] due to high energy consumption to power the mechanical ventilation systems
In recent years, global warming has worsened
Based on the velocity vector from all seven cases shown in Figure 6, there is a small standing vortex formed at the bottom part outside of the building due to the no-slip condition on the ground
Summary
The excess use of mechanical ventilation to maintain thermal comfort has become one of the causes of global warming [1] due to high energy consumption to power the mechanical ventilation systems. According to Agrawal, mechanical ventilation appliances such as fans and air conditioners in HVAC system consume high amount of energy for buildings [4]. Based on the report of World Business Council for Sustainable Development (WBCSD), buildings consume a total of 40% of the world’s energy use. Compare a natural ventilated house to air-conditioned house, the carbon released and the energy consumption is about 67% higher for air-conditioned house. WBSCD has advised the building sector to fuse innovative designs, technological innovation, and public policies to incorporate natural ventilation in order to obtain better energy efficiency [5]
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