scholarly journals Evaluating single-sided natural ventilation models against full-scale idealised measurements: Impact of wind direction and turbulence

2020 ◽  
Vol 170 ◽  
pp. 106556 ◽  
Author(s):  
H.L. Gough ◽  
J.F. Barlow ◽  
Z. Luo ◽  
M.-F. King ◽  
C.H. Halios ◽  
...  
Keyword(s):  
Wind Direction ◽  
Natural Ventilation ◽  
Full Scale

Effect of natural ventilation mode on thermal comfort and ventilation performance: Full-scale measurement

2017 ◽  
Vol 156 ◽  
pp. 1-16 ◽  
Author(s):  
Sara Omrani ◽  
Veronica Garcia-Hansen ◽  
Bianca R. Capra ◽  
Robin Drogemuller
Keyword(s):  
Thermal Comfort ◽  
Natural Ventilation ◽  
Full Scale ◽  
Ventilation Mode ◽  
Ventilation Performance

Small and Full-Scale Modeling for the Application of Wall Solar Chimneys

2016 ◽  
Author(s):  
David Park ◽  
Francine Battaglia
Keyword(s):  
Natural Ventilation ◽  
Velocity Ratio ◽  
Thermal Conditions ◽  
Ambient Air ◽  
Full Scale ◽  
Scale Model ◽  
Small Scale ◽  
Solar Chimney ◽  
Window Position ◽  
Pi Theorem

A solar chimney is a natural ventilation technique that has a potential to save energy consumption as well as to maintain the air quality in the building. However, studies of buildings are often challenging due to their large sizes. The objective of the current study was to determine relationships between small- and full-scale solar chimney system models. In the current work, computational fluid dynamics (CFD) was utilized to model different building sizes with a solar chimney system, where the computational model was validated with the experimental study of Mathur et al. The window, which controls entrainment of ambient air, was also studied to determine the effects of window position. Correlations for average velocity ratio and non-dimensional temperature were consistent regardless of window position. Buckingham pi theorem was employed to further non-dimensionalize the important variables. Regression analysis was conducted to develop a mathematical model to predict a relationship among all of the variables, where the model agreed well with simulation results with an error of 2.33%. The study demonstrated that the flow and thermal conditions in larger buildings can be predicted from the small-scale model.

scholarly journals Curtain Wall with Solar Preheating of Ventilation Air. Full Scale Experimental Assessment

2020 ◽  
Vol 172 ◽  
pp. 09007
Author(s):  
Roberto Garay-Martinez ◽  
Beñat Arregi
Keyword(s):  
Natural Ventilation ◽  
Integrated Control ◽  
Substantial Reduction ◽  
Systems Design ◽  
Full Scale ◽  
Curtain Wall ◽  
Smart Control ◽  
Scale Experiment ◽  
Ventilated Facade ◽  
Ventilation Systems

Heating load in Commercial buildings is highly related with ventilation systems, while at the same time local discomfort in the vicinity of glass walls occurs due to overheating. In this paper, a novel double envelope curtain wall is presented, which extracts heat from the façade by means of a ventilated cavity which is then incorporated to the ventilation air intake. A substantial reduction of heating loads is achieved. Whenever solar gains are not sought, a bypass element allows the natural ventilation of this air cavity, acting as a ventilated façade. An integrated control system with embedded electronics and actuators allows for a smart control of the system. The system is designed for integration with existing rooftop ventilation systems. Design considerations are discussed, and the outcomes of a full-scale experiment conducted in Bilbao (Spain) along 2019 presented.

Temperature profile of fire-induced smoke in node area of a full-scale mine shaft tunnel under natural ventilation

2017 ◽  
Vol 110 ◽  
pp. 382-389 ◽  
Author(s):  
Chang Liu ◽  
Maohua Zhong ◽  
Congling Shi ◽  
Peihong Zhang ◽  
Xiangliang Tian
Keyword(s):  
Temperature Profile ◽  
Natural Ventilation ◽  
Full Scale ◽  
Mine Shaft

Numerical Simulation of Campus Wind Environment

2010 ◽  
Vol 160-162 ◽  
pp. 280-286
Author(s):  
Ri Chao Liu ◽  
Zhong Hua Tang ◽  
Wei Yang Qi
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Wind Direction ◽  
Natural Ventilation ◽  
Pressure Field ◽  
Field Analysis ◽  
Wind Environment ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method ◽  
Rng Turbulence Model

This paper adopted computational fluid dynamics (CFD) method, used k-ε RNG turbulence model-closed control differential equations for numerical simulation. Through numerical simulation and analysis of wind environment in a middle school campus, the round wind field under dominant wind direction was got in the summer and winter. According to the results of velocity field and pressure field, analysis the wind environment, compared the influence of wind direction and surrounding buildings space to the natural ventilation, provided guidance introduce for the layout of the school.

scholarly journals Effects of Lateral Window Position and Wind Direction on Wind-Driven Natural Cross Ventilation of a Building: A Computational Approach

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
M. Z. I. Bangalee ◽  
J. J. Miau ◽  
S. Y. Lin ◽  
M. Ferdows
Keyword(s):  
Wind Direction ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Ventilation Rate ◽  
Experimental Investigations ◽  
Original Design ◽  
Lateral Direction ◽  
Window Position ◽  
Ventilation Performance ◽  
Moderate Range

Energy is saved when an effective natural ventilation system can provide comfort air to the occupants in a building by replacing a mechanical ventilation system. It also minimizes the risk of the environmental pollution and the global warming. A one story, full scale building was considered to carry out a comparative study of three different cases of wind-driven natural (WDN) cross ventilation with the help of computational fluid dynamics (CFD). In each case, the location of window was changed in lateral direction to predict the probable position for optimum ventilation performance and the angle of wind was varied to check the sensitivity of the wind direction on the flow field. After validating the current methodology through two satisfactory comparisons with the experimental investigations, the governing equations subjected to the corresponding boundary conditions were solved using commercial software and then the results were analyzed. A better location for the windows in each case was proposed. The ventilation purpose was served quite well even if the wind angle was changed in a moderate range from the original design. Furthermore, the velocity components, ventilation rate, surface pressure, ventilation time, and so forth in each case were investigated and compared extensively with those in other cases.

scholarly journals Performance analysis of a new system for night cooling of buildings on a full scale office room - CFD study

2021 ◽  
Vol 2116 (1) ◽  
pp. 012106
Author(s):  
M Lança ◽  
P J Coelho ◽  
J Viegas
Keyword(s):  
Natural Ventilation ◽  
Concrete Slab ◽  
Full Scale ◽  
Energy Saving Potential ◽  
Air Supply ◽  
New Type ◽  
Computational Fluid Dynamics Cfd ◽  
The Difference ◽  
Night Ventilation ◽  
Indoor Conditions

Abstract Night natural ventilation systems have been receiving increased attention in recent years because of their energy saving potential and environmental protection when used in passive instead of active cooling. A recently proposed novel system for cooling the building concrete slab is studied numerically in the present work. It consists of a new type of a Suspended Ceiling (SC) with a peripheral gap between it and the walls, combined with the positioning of the air supply and extraction grilles between the ceiling slab and the SC. The system relies only on night ventilation as a means for cooling down the structure of the building. This study focuses on the use of Computational Fluid Dynamics (CFD) to predict the airflow and thermal performance of this strategy and it is applied to a full scale office room. The calculations show that a SC with a gap can reduce the difference between the average temperatures at the end of the heating and the end of the cooling periods by 25% compared with the case of a full covered slab room scenario (tight SC). CFD proved to be a useful and accurate tool to predict indoor conditions in buildings.

scholarly journals Research on the Impact of Wind Angles on the Residential Building Energy Consumption

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Zou Huifen ◽  
Yang Fuhua ◽  
Zhang Qian
Keyword(s):  
Energy Consumption ◽  
Heat Loss ◽  
Indoor Air ◽  
Wind Direction ◽  
Natural Ventilation ◽  
Building Energy ◽  
Simulation Software ◽  
Outdoor Environment ◽  
Building Energy Consumption ◽  
The Impact

Wind angles affect building’s natural ventilation and also energy consumption of the building. In winter, the wind direction in the outdoor environment will affect heat loss of the building, while in summer the change of wind direction and speed in the outdoor environment will affect the building’s ventilation and indoor air circulation. So, making a good deal with the issue of the angle between local buildings and the dominant wind direction can effectively solve the winter and summer ventilation problems. Thereby, it can enhance the comfort of residential person, improve indoor air quality, solve heat gain and heat loss problems in winter and summer in the severely cold and cold regions, and reduce building energy consumption. The simulation software CFD and energy simulation software are used in the paper. South direction of the building is the prototype of the simulation. The angle between the direction of the building and the outdoor environment wind is changed sequentially. Energy consumption under different wind angle conditions is compared with each other. Combined with natural ventilation under various wind angles, the paper gives the best recommended solution of building direction in Shenyang.

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