Numerical Study of the Natural Ventilation in House: Cases of Three Rectangular Scale Models

2011 ◽  
Vol 4 (2) ◽  
pp. 137-154 ◽  
Author(s):  
Augustin Memeledje ◽  
Maurice Djoman ◽  
Alhassane Fofana ◽  
Aboudramane Gbane ◽  
Aboubakar Sako
Keyword(s):  
Natural Ventilation ◽  
Numerical Study ◽  
Scale Models

scholarly journals Performance Characteristics of Solid-Desiccant Evaporative Cooling Systems

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2574 ◽  
Author(s):  
Ramadas Narayanan ◽  
Edward Halawa ◽  
Sanjeev Jain
Keyword(s):  
Air Conditioning ◽  
Natural Ventilation ◽  
Waste Heat ◽  
Numerical Study ◽  
Evaporative Cooling ◽  
Peak Load ◽  
Dew Point ◽  
Low Grade ◽  
Subtropical Climate ◽  
Cooling Systems

Air conditioning accounts for up to 50% of energy use in buildings. Increased air-conditioning-system installations not only increase total energy consumption but also raise peak load demand. Desiccant evaporative cooling systems use low-grade thermal energy, such as solar energy and waste heat, instead of electricity to provide thermal comfort. This system can potentially lead to significant energy saving, reduction in carbon emissions, and it has a low dew-point operation and large capacity range. Their light weight, simplicity of design, and close-to-atmospheric operation make them easy to maintain. This paper evaluates the applicability of this technology to the climatic conditions of Brisbane, Queensland, Australia, specifically for the residential sector. Given the subtropical climate of Brisbane, where humidity levels are not excessively high during cooling periods, the numerical study shows that such a system can be a potential alternative to conventional compression-based air-conditioning systems. Nevertheless, the installation of such a system in Brisbane’s climate zone requires careful design, proper selection of components, and a cheap heat source for regeneration. The paper also discusses the economy-cycle options for this system in such a climate and compares its effectiveness to natural ventilation.

scholarly journals Numerical Study on Coupled Operation of Stratified Air Distribution System and Natural Ventilation under Multi-Variable Factors in Large Space Buildings

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8130
Author(s):  
Ziwen Dong ◽  
Liting Zhang ◽  
Yongwen Yang ◽  
Qifen Li ◽  
Hao Huang
Keyword(s):  
Thermal Comfort ◽  
Working Conditions ◽  
Distribution System ◽  
Distribution Systems ◽  
Natural Ventilation ◽  
Numerical Study ◽  
Air Distribution ◽  
Large Space ◽  
Air Conditioners ◽  
Air Supply

Stratified air distribution systems are commonly used in large space buildings. The research on the airflow organization of stratified air conditioners is deficient in terms of the analysis of multivariable factors. Moreover, studies on the coupled operation of stratified air conditioners and natural ventilation are few. In this paper, taking a Shanghai Airport Terminal departure hall for the study, air distribution and thermal comfort of the cross-section at a height of 1.6 m are simulated and compared under different working conditions, and the effect of natural ventilation coupling operation is studied. The results show that the air distribution is the most uniform and the thermal comfort is the best (predicted mean vote is 0.428, predicted percentage of dissatisfaction is 15.2%) when the working conditions are 5.9% air supply speed, 11 °C cooling temperature difference and 0° air supply angle. With the coupled operation of natural ventilation, the thermal comfort can be improved from Grade II to Grade I.

Numerical Study of Optimal Building Scales With Low Cooling Load in Both Hot and Mild Climatic Regions

Solar Energy ◽  
2006 ◽  
Author(s):  
Zhiqiang Zhai
Keyword(s):  
Los Angeles ◽  
Natural Ventilation ◽  
Numerical Study ◽  
Energy Requirement ◽  
Building Energy ◽  
Energy Performance ◽  
Climatic Regions ◽  
Scale Ratio ◽  
Building Cooling ◽  
Energy Efficient Building

Natural ventilation is one of the primary strategies for buildings in hot and mild climatic regions to reduce building cooling energy requirement. This paper uses a building energy simulation program and a computational fluid dynamics program to investigate the influence of building scales on building cooling energy consumption with and without natural ventilation. The study examines the energy performance of buildings with different L/W and H/W ratios in both Miami, FL and Los Angeles, CA. The simulation results show the varying trends of natural ventilation potential with increased building scale ratio of L/W and H/W. The comparison of the predicted energy consumptions for twenty buildings discloses the most energy-efficient building scales for rectangular-shape buildings in both hot and mild climates with and without natural ventilation. The study indicates that natural ventilation is more effective in mild climates than in hot climates, which may save cooling energy by 50% and vent fan energy by 70%. The paper analyzes the most suitable seasons for natural ventilation in Miami and Los Angeles. Further simulations indicate that extra cooling benefits associated with more natural ventilation cannot compensate additional heat gains through larger windows.

scholarly journals Numerical Study of Flow Pattern in Buildings with Different Heights

2016 ◽  
Vol 2 (3) ◽  
pp. 95-101
Author(s):  
Ali Hooshmand Aini
Keyword(s):  
Flow Pattern ◽  
Natural Ventilation ◽  
Numerical Study ◽  
Flow Patterns ◽  
Accurate Analysis ◽  
Air Movement ◽  
Fluent Software

Understanding the flow pattern around the building, results in an accurate analysis of structure performance. Furthermore, having a proper configuration of the buildings next to each other we can provide a situation in which the buildings use the wind to make the air movement and natural ventilation. In this paper we use the FLUENT software to verify numerical flow pattern in buildings with different heights, and the results are provided in the form of distribution of velocities, velocity in Y direction, flow patterns and counters of turbulent.  

Experimental and numerical study on fire-induced smoke temperature in connected area of metro tunnel under natural ventilation

2019 ◽  
Vol 138 ◽  
pp. 84-97 ◽  
Author(s):  
Chang Liu ◽  
Maohua Zhong ◽  
Xiangliang Tian ◽  
Peihong Zhang ◽  
Yan Xiao ◽  
...  
Keyword(s):  
Natural Ventilation ◽  
Numerical Study ◽  
Connected Area ◽  
Metro Tunnel

Numerical study of natural ventilation in urban shallow tunnels: Impact of shaft cross section

2018 ◽  
Vol 42 ◽  
pp. 521-537 ◽  
Author(s):  
Baochao Xie ◽  
Yaxiong Han ◽  
He Huang ◽  
Linna Chen ◽  
Yang Zhou ◽  
...  
Keyword(s):  
Cross Section ◽  
Natural Ventilation ◽  
Numerical Study ◽  
Shallow Tunnels

Analytical and numerical study on natural ventilation performance in single- and gable-slope city tunnels

2019 ◽  
Vol 45 ◽  
pp. 258-270 ◽  
Author(s):  
Yang Zhou ◽  
Yang Yang ◽  
Zhanli Mao ◽  
Rongwei Bu ◽  
Junhui Gong ◽  
...  
Keyword(s):  
Natural Ventilation ◽  
Numerical Study ◽  
Ventilation Performance
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