scholarly journals MONITORING POINT OF EXTERNAL WIND VELOCITY AROUND BUILDING ROOF TOP FOR NATURAL VENTILATION CONTROL

2021 ◽  
Vol 86 (783) ◽  
pp. 537-547
Author(s):  
Hajime AKASHI ◽  
Tomohiro KOBAYASHI ◽  
Toshio YAMANAKA ◽  
Kana SATO
Keyword(s):  
Wind Velocity ◽  
Natural Ventilation ◽  
Monitoring Point ◽  
Ventilation Control ◽  
Building Roof

Effects of different wind directions on ventilation of surrounding areas of two generic building configurations in Hong Kong

2021 ◽  
pp. 1420326X2110160
Author(s):  
Kai Yip Lee ◽  
Cheuk Ming Mak
Keyword(s):  
Wind Velocity ◽  
Natural Ventilation ◽  
Urban Environments ◽  
Air Pressure ◽  
Pressure Distributions ◽  
Air Intake ◽  
Dynamics Simulations ◽  
Surrounding Areas ◽  
Effective Use ◽  
Velocity Zone

This study investigated effects of incident wind angles on wind velocity distributions in wakes of two generic building configurations, namely, ‘T’- and ‘+’-shaped, and the air pressure distributions along their leeward walls by using computational fluid dynamics simulations. Results show that when the wind approaches laterally (90°) (vs. when the wind is direct (0°)), the downwind length and maximum bilateral width of the low-wind velocity zone in the wake of ‘T’-shaped building decrease by 11.5% and 37.9%, respectively. When the incident wind is oblique (45°) (vs. when it is direct), the length and width of this low-wind velocity zone in the wake of ‘+’-shaped building decrease by 15.0% and 30.9%, respectively. Furthermore, results show that the air pressure on the leeward walls of the ‘T’- and ‘+’-shaped buildings gradually decreases along with the building height. The resulting low-wind conditions on upper floors of buildings reduce the fresh air intake of their leeward units utilizing natural ventilation. It is particularly apparent in the case of direct approaching wind. Thus, the appropriate selection of building configurations and their orientations allows for the most effective use of wind to enhance ventilation in indoor and urban environments.

scholarly journals Optimalisasi Penghawaan Alami melalui Tata Ruang di Rumah Susun Bertingkat Rendah

Jurnal IPTEK ◽  
2018 ◽  
Vol 2 (1) ◽  
pp. 150-160
Author(s):  
Fuad Rizal
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Public Housing ◽  
Wind Velocity ◽  
Indoor Air ◽  
Natural Ventilation ◽  
Electricity Consumption ◽  
Building Design ◽  
Maintenance Cost ◽  
Housing Design

ABSTRACT Quality of natural ventilation in low rise public housing in Jakarta tends to be low. Situation mentioned above presumably caused by several case, among other form and unadequate opening placement, unadequate furniture placement, form and orientation of public housing mass and minimum building protection from sun radiation. Whereas natural ventilation have an importent role in increasing indoor air quality, increasing occupant healthy and help increasing electricity consumption eficiency. The objective of this research is attempt solving natural ventilation problems in low rise public housing architecturally through designs that could used for occupant activity precisely and presenting good natural ventilation simultaneously so it can support occupant activity in public housing as efficiently, comfortable, healthy and secure. Research begins with conduct an observation towards existing public housing in Jakarta through interview, documentation of existing public housing condition and studying public housing designs through working documents and related standards. Collecting climate data especially wind velocity conducted to get illustration of condition that take place in definite period. Those data then analyzed to produce a model formula of public housing building that tested later with computer. The result of research show that the problems of natural ventilation in low rise public housing can be solved by accurately building design that can adapt with surrounding nature. Quite significant positive change occurs after modification does to the existing unit. Hopefully government through certain official can produce public housing design which more optimal, especially in natural ventilation. People also could knowing the caused of natural ventilation problems inside the room also could solving it by simply, efficiently and accurately through the result of this research. Some advantages occupant could gained are good and prevalent airflow inside the room, reducing air conditioning equipment utilization frequency, less maintenance cost and can it can works all the time.  Keywords: natural ventilation, sun radiation, electricity consumption efficiency, indoor air quality, low rise public housing, wind velocity

scholarly journals Influence of the ecological conditions on breeding in closed covered brick barn of black-and-white cows and some ethological reactions

2008 ◽  
Vol 24 (5-6) ◽  
pp. 23-31
Author(s):  
K. Krastev ◽  
K. Boychev
Keyword(s):  
Relative Humidity ◽  
Wind Velocity ◽  
Natural Ventilation ◽  
Abiotic Factors ◽  
Production Environment ◽  
Ecological Conditions ◽  
Black And White ◽  
Milk Cows

This study was done with the aim to establish the season dynamics of ethological indicators: lying, standing, feeding and drinking of milk cows with is result of such abiotic factors as: temperature, relative humidity and wind velocity movement in production environment. The animals were bred during the year in closed covered brick barn with natural ventilation. From the analysis of the received results is clear that the parameters of the ethological reactions are changing in a cycle during the seasons of the year. This is an expression of the reaction towards the influence of the abiotic factors of the environment.

Window geometry impact on a room's wind comfort

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Reza Fallahtafti ◽  
Mohammadjavad Mahdavinejad
Keyword(s):  
Wind Velocity ◽  
Natural Ventilation ◽  
Control Volume ◽  
Simple Algorithm ◽  
Small Scale ◽  
Solar Absorption ◽  
Content Type ◽  
Velocity Magnitude ◽  
Architectural Element ◽  
The Impact

PurposeNatural ventilation is an environmentally friendly effective way of improving thermal comfort and the quality of indoor conditions if applied properly. This study aims to investigate the physical mechanism of the air movement and also the influence of building geometry in a cross-ventilated room through a parametric study of window geometrical characteristics using computational fluid dynamics.Design/methodology/approachMomentum and continuity equations are solved by the control volume method using a commercially available software. Standard k−ɛ turbulence model is employed to simulate the incompressible airflow and SIMPLE algorithm to solve the conservation equations. Mean air velocity magnitude is measured at three different surfaces of different heights, and the effect of incoming wind velocity inside the building is studied.FindingsThe research concluded that window hood and sill projections reduce indoor wind velocity magnitude, play a major role in incoming wind direction and thus have a crucial impact on wind circulation and indoor air quality.Social implicationsThe paper has evaluated redesigning of a both practical and ornamental architectural element named Palekaneh, which is found in many historical buildings in several hot places in the world. Its optimal design could increase indoor natural ventilation quality and decrease a space's cooling load. Therefore, a new passive cooling architectural element could be re-introduced to the regions previously enjoying such ornaments. This is economically efficient because it eventually saves a considerable amount of energy in the long run and is socially important because of the revitalization of architectural identity.Originality/valueThe role of a building envelope's physical features, although being studied for solar absorption and daylight availability, has rarely been investigated for natural ventilation, especially in a small scale, thus making the paper novel in this regard. This provides a guideline for designers to assess the impact of their design on redirecting wind-induced natural ventilation the very early stages of design.

The Impact of Gymnasium Form’s Tilting Side Interfaces on Natural Ventilation and Thermal Comfort of Exercise Site

2014 ◽  
Vol 587-589 ◽  
pp. 490-497
Author(s):  
Jin Li ◽  
Yuan You
Keyword(s):  
Thermal Comfort ◽  
Wind Velocity ◽  
Natural Ventilation ◽  
Change Rate ◽  
Symmetrical Mode ◽  
Air Change Rate ◽  
Window Opening ◽  
Symmetrical Model ◽  
Ventilation Strategies ◽  
The Impact

To improve air change rate and exercise site’s thermal comfort of gymnasium under natural ventilation in hot and humid areas, taking Guangzhou as an example, symmetrical model, unsymmetrical model, and unsymmetrical model with corbel table were simulated and calculated with Fluent and other software. The result indicates that, compared with symmetrical mode, unsymmetrical model and unsymmetrical model with corbel table can improve exercise site’s wind velocity and integral air change rate, and the latter model improves more. Based on unsymmetrical model with corbel table, window-opening ventilation strategies for competition are further put forward. In the end, it discusses about the influence towards thermal comfort of exercise site by natural ventilation in different form models and different use modes.

The effects of wind velocity and building geometry on air change efficiency in light shafts: Case studies

2016 ◽  
Vol 38 (1) ◽  
pp. 5-20 ◽  
Author(s):  
Miguel Ángel Padilla-Marcos ◽  
Jesús Feijó-Muñoz ◽  
Alberto Meiss
Keyword(s):  
Wind Velocity ◽  
Natural Ventilation ◽  
Efficiency Index ◽  
Practical Applications ◽  
Building Shape ◽  
Building Geometry ◽  
Outdoor Environments ◽  
Wind Velocities ◽  
External Conditions ◽  
Light Shaft

The evaluation of the air quality in light shafts requires a specific study of its air renewal ability due to building shape, dimensions and other external conditions. This research has studied the capacity of light shafts to provide natural ventilation through the air change efficiency concept. A methodology based on the limitation of the computational urban domain is used to adapt the indoor air change efficiency index for outdoor environments. Numerical simulations were performed using CFD and a model that was experimentally validated. The aim is to evaluate the effect of the centreline building width and light shaft dimensions in the air change quality within several wind climates. Results would provide a numerically proven tool for designers, summarised in some design-based strategies in order to select which one improves the air change quality. The results indicate that the light shaft dimension perpendicular to the wind direction has a negligible effect on efficiency. For the range of wind velocities studied (0.75–9.00 m/s), the efficiency decreases at higher velocities, up to −7.41% with respect to the mean. For variations in the wind velocity and the centreline building width, a mean variation of ± 18.77% in the efficiency is obtained. Practical applications: The present methodology defines a proceeding to numerically evaluate the air change efficiency in light shafts inside different dimensional cases of buildings within several urban wind conditions.

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