Flow Regimes and Thermal Comfort Around Spectators in Air Conditioned Squash Courts

2011 ◽  
Author(s):  
Hesham S. A. Munem ◽  
ElSayed K. Abou El Kassem ◽  
Essam E. Khalil
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Air Flow ◽  
Flow Regimes ◽  
Flow Properties ◽  
Simulation Techniques ◽  
Heated Air ◽  
Computational Fluid Dynamics Cfd ◽  
Humidity Profiles

Although there are still a number of squash arenas that are not air-conditioned or heated; Air conditioning of squash courts has become a trend when design and establishing new squash courts as well as other sporting arena. The current paper numerically investigates the influence of location and number of air conditioning supply and extracts openings on air flow properties in spectators’ area within a squash area. The present work focuses on predicting air flow patterns and thermal behaviour through investigating of the air flow regimes and moisture content inside the spectators’ area. Furthermore, the work investigates the heat transfer behaviour through analysing temperature and relative humidity profiles within the area. Moreover, carbon dioxide dispersion is investigated in order to recommend design features that aid to achieve the thermal comfort environment inside the studied area. The present investigation made use of Computational Fluid Dynamics (CFD) simulation techniques as embedded in the commercially available code (FLUENT 6.2).

A Study on the Performance of Stratified Air Conditioning Design in Assembly Halls – A Case Study at the Dazhi Cultural Center in Taiwan

2013 ◽  
Vol 368-370 ◽  
pp. 599-602 ◽  
Author(s):  
Ian Hung ◽  
Hsien Te Lin ◽  
Yu Chung Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Indoor Temperature ◽  
Cultural Center ◽  
Computational Fluid Dynamics Cfd

This study focuses on the performance of air conditioning design at the Dazhi Cultural Center and uses a computational fluid dynamics (CFD) simulation to discuss the differences in wind velocity and ambient indoor temperature between all-zone air conditioning design and stratified air conditioning design. The results have strong implications for air conditioning design and can improve the indoor air quality of assembly halls.

scholarly journals Air Flow Regimes and Thermal Comfort in Vehicle Cabin Considering Solar Radiation

2017 ◽  
Vol 04 (04) ◽  
Author(s):  
Ibrahim Reda ◽  
Essam E Khalil ◽  
Taher M Aboudeif ◽  
Ahmed El Degwy
Keyword(s):  
Solar Radiation ◽  
Thermal Comfort ◽  
Air Flow ◽  
Flow Regimes ◽  
Vehicle Cabin

Comparative research on the air pollutant prevention and thermal comfort for different types of ventilation

2020 ◽  
pp. 1420326X2092552
Author(s):  
Yang Zhang ◽  
Wenxuan Yu ◽  
Youli Li ◽  
Han Li
Keyword(s):  
Thermal Comfort ◽  
Cfd Simulation ◽  
Thermal Sensation ◽  
Side Wall ◽  
Air Pollutant ◽  
Indoor Thermal Comfort ◽  
Subjective Experiment ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd ◽  
Indoor Comfort

In this article, a comparative study on the outdoor air pollutant prevention and indoor thermal comfort for different types of ventilation was carried out. Both objective experiment, subjective experiment and computational fluid dynamics (CFD) simulation were conducted to investigate the differences in air pollutant prevention and thermal comfort between four common ventilation methods, namely supplying on the ceiling and returning on the ceiling (SC-RC), supplying on the ceiling and returning on the side wall (SC-RSW), supplying on the side wall and returning on the ceiling (SSW-RC), and supplying on the side wall and returning on the side wall (SSW-RSW). Results show that SSW-RSW can provide the highest indoor air quality according to the indoor average PM2.5 concentration. Overall thermal sensation was introduced to evaluate the indoor comfort under the four ventilation methods. The voting results show that the indoor thermal comfort can be enhanced by 29–36% under SSW-RSW and SSW-RC. Therefore, SSW-RSW is more suitable for providing a healthy and comfortable indoor environment.

CFD SIMULATION OF THERMAL COMFORT USING INDIVIDUALIZED AIR CONDITIONING SYSTEMS

2015 ◽  
Author(s):  
Rafael Prata Ritzinger ◽  
Nathane Ventura de Miranda ◽  
Álvaro M. Bigonha Tibiriçá ◽  
Alexandre Navarro da Silva ◽  
Henrique Márcio Pereira Rosa ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Air Conditioning Systems

Numerical Investigation on Ventilation Strategy for Laboratories: An Approach to Control Thermal Comfort and Air Quality Using Active Chilled Beams

2007 ◽  
Author(s):  
Farhad Memarzadeh ◽  
Jane Jiang ◽  
Andy Manning
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Flow Rate ◽  
Cfd Simulation ◽  
Washington Dc ◽  
Ventilation Strategy ◽  
Flow Rates ◽  
Beam System ◽  
Computational Fluid Dynamics Cfd ◽  
Lower Flow Rate

Laboratories are usually equipment intensive. The supply flow rates required to cool these laboratories are generally higher than in a less equipment intensive zone of the building. The thermal comfort of occupants in laboratories can be controlled by the choice of ventilation strategy. This study employs Computational Fluid Dynamics (CFD) simulation to assess the performance of active chilled beams in a general laboratory layout with some equipment intensive areas and the removal effectiveness of such a system. The chilled beam performance is also compared with at of ceiling diffusers. The results from this study show that the chilled beams improve thermal comfort, and they can be operated at as low as 4 ACH while maintaining very satisfactory average PPD (around 10%) in the occupied zones. The chilled beam system also improves removal effectiveness because of the inherent higher total supply flow rate that results in a better mixing in the room than ceiling diffusers. The chilled beams in the cases studied are seen to have an insignificant effect on the hood containment. As satisfactory thermal comfort and air quality can be achieved at a lower flow rate in comparison with all-air ceiling diffusers, a 14% saving is estimated in annual energy cost for cooling and ventilating a typical lab in the Washington DC area.

scholarly journals The Examination of Air Blowing Method and Thermal Comfort of Variable Air Conditioning System using Coanda Effect

2019 ◽  
Vol 111 ◽  
pp. 01079
Author(s):  
Hikari Sakakibara ◽  
Takashi Akimoto ◽  
Hitomi Igarashi ◽  
Shunsuke Nakamura ◽  
Madoka Kimura
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Air Flow ◽  
Building Design ◽  
Upper Body ◽  
Coanda Effect ◽  
Subjective Perception ◽  
Air Conditioning System ◽  
Air Blowing ◽  
Coandǎ Effect

The “Strategic Energy Plan” implemented by the Cabinet of Japan in 2014 strives for zero energy building design for typical new construction by 2030. The present study focuses on a ductless and variable air conditioning system, using the Coanda effect, with the aim of reducing fan power, and saving of resources by reducing the space between the ceiling. In this study, we examined the air blowing method and evaluated thermal comfort using computational fluid dynamics as well as subjective perception of coolness in a midsize office. A draft zone was reduced by extending the interval between conditioned air outlets. However, if the extension of throw length was excessive, hot space would be formed near the air outlets, and there would be a risk of impacting thermal comfort. Moreover, we confirmed that the thermal comfort was generally favourable. In particular, perceived thermal comfort was better at the position in the office where the air flow landed on the upper body of the subjects. On the other hand, it decreased when the influence of the air flow was small, and at the point where air flow landed on the lower body of the subjects.

CFD SIMULATION OF FLOW THROUGH AN OPEN CELL FOAM

2008 ◽  
Vol 19 (05) ◽  
pp. 703-715 ◽  
Author(s):  
G. TABOR ◽  
O. YEO ◽  
P. YOUNG ◽  
P. LAITY
Keyword(s):  
Computational Analysis ◽  
Cfd Simulation ◽  
Flow Speed ◽  
Flow Properties ◽  
Pressure Drops ◽  
Open Cell Foam ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Through ◽  
First Time ◽  
Unit Pressure

A sample of an open-celled plastic foam has been examined using a combination of experimental, microscopic and computational methods. The aim was to use image-based meshing techniques to generate for the first time geometrically faithful models of the microstructure of the foam, and to use Computational Fluid Dynamics (CFD) to compute flow properties and pressure drops across the sample. The microstructure of the foam was also investigated experimentally and using SEM to provide further information for the computational analysis. A comparison was made with existing experimental data on flows through foams, and the unit pressure drop was found to correlate with the flow speed in the appropriate manner.

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