This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Ventilation Improvement in a Non-AC Bus
Technical Paper
2013-01-2457
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Ventilation is a crucial factor affecting passenger comfort in any vehicle. In a non-air-conditioned bus, ventilation caters to the dual requirement of fresh breathing air as well as providing a cooling sensation by enhanced evaporation of sweat. The higher the velocity of air around the passengers, the greater the cooling effect experienced by them. The ventilation mechanism of a non-air-conditioned bus is primarily the air flow through the windows due to relative motion between the bus and the air around it. This paper describes studies carried out to identify the right combination of open windows which would provide optimum air flow at the passenger head level plane in a bus. A bus model with 12 windows, 6 on each side is used for the study and air velocity at certain points in the head level plane, arising out of different combination of window openings is evaluated using CFD. The minimum value of velocity observed among the points, which is indicative of the minimum level of comfort provided by the combination, is compared for different combinations of openings and the optimum identified. Since a comparison of all possible combinations would involve evaluating 312 CFD runs, Design of Experiments (DOE) is used to obtain the optimum using a reduced number of analyses. Through this study it is attempted to place windows only at few strategic locations that would contribute to optimum air flow at all points within the bus by eliminating the non contributing windows without reduction in passenger comfort, thereby changing bus design philosophies and providing greater freedom in bus design. The optimum configuration of windows was found to provide ∼17% reduction in window area.
Recommended Content
Technical Paper | Evaluation of Bus Ventilation Methods Using CFD |
Technical Paper | Side Window Buffeting Characteristics of an SUV |
Technical Paper | Reconstruction of Formula 1 Engine Instantaneous Speed by Acoustic Emission Analysis |
Authors
Topic
Citation
John, P., Sriram, B., R, S., Kumar, S. et al., "Ventilation Improvement in a Non-AC Bus," SAE Technical Paper 2013-01-2457, 2013, https://doi.org/10.4271/2013-01-2457.Also In
References
- Kale , S. R. , Veeravalli , S. V. , Punekar , H. D. and Yelmule , M. M. Air Flow through a Non-airconditioned Bus with Open Windows Sadhana 32 4 347 363 2007
- Visagavel , K. and Srinivasan , P. S S. Analysis of Cross and Single Sided Naturally Ventilated Rooms using CFD American Journal of Environmental Sciences 3 4 188-19 2007
- Hoof , T.V. and Blocken , B. CFD Analysis of Natural Ventilation in Large Semi-enclosed Buildings Proc. 11 th International IBPSA Conference Glasgow, Scotland 2009
- Karki , K.C. , Patankar , S.V. , Rosenbluth , E.M. and levy , S.S. CFD Model for Jet Fan Ventilation Systems Proc. 10 th International Symposium on Aerodynamics and ventilation of Vehicle tunnels, Principles, analysis and Design Boston, U.S.A. 2000
- Thomas , M. , Sharma , R.N. and Kilduff , M. Aerodynamic Effects on Different Types of Ventilations Systems Proc. of The Fourth International Symposium on Computational Wind Engineering Yokohama 2006
- Lin , B. , Wang X. and Hu , X. Research on the Effect of Natural Ventilation on Buses in Summer Based on Numerical Simulation Method Advanced Materials Research 1056 1060 2012 10.4028/www.scientific.net/AMR.361-363.1056
- S , V. , C , V. , and P , S. Evaluation of Bus Ventilation Methods Using CFD SAE Technical Paper 2013-26-0043 2013 10.4271/2013-26-0043
- Liu , Y. and Moser , A. Numerical Modeling of Airflow Over the Ahmed Body Proceedings of the 11 th Annual Conference of the CFD Society of Canada Canada 507 512 2003
- Ahmed , S. , Ramm , G. , and Faltin , G. Some Salient Features Of The Time-Averaged Ground Vehicle Wake SAE Technical Paper 840300 1984 10.4271/840300