Habib GÜRBÜZ, İsmail Hakkı AKÇAY, Hussein ASGHAR, Qays Adnan ALİ

Analysis of bus air conditioning system by finite elements method (ANSYS)

Air conditioning systems used for the cooling of vehicles to create a uniform temperature distribution in terms of providing thermal comfort to people is an important parameter. From this point, realization of appropriate computer simulations of these systems during the design phase provides a significant convenience to the success of the design. In this study, determination of the time required to reduce the bus indoor initial temperature at  310 K ( 37 °C) of a bus for 49 passengers including the driver to  293 K ( 20 °C) gradually with a uniform temperature distribution and the temperature, pressure and velocity distribution were analyzed using finite elements method (ANSYS). In finite element program, developed for this purpose indoor thermal load of 49 people including the driver in the bus has been calculated by using thermal mannequin modeling, the internal conditions were integrated to real conditions. As a result of the temperature pressure and velocity distribution graphics obtained at 5 minutes intervals depending on real conditions case scenario in ANSYS program, it was determined that in about 15 minutes the indoor temperature distribution of the bus has reached to  293 K value uniformly

Keywords:

Bus, Air Conditioning, Finite Elements Analysis,

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Nilsson H., Holmér I., Bohm M., Norén O., Effects on thermal comfort using special glazing-comparison of CFD calculations and manikin measurements, Int. Ata. Conf, 17-19 Nov, Florence, Italy, 1999.
Bohm M., Holmér I., Nilsson H., Norén O., Thermal effect of glazing in driver´s cabs. JTIRapport, Uppsala, Sweden, No: 5, 2002.
Wyon D., Tennstedt C., Lundgren I., Larsson S., A new method for the detailed assessment ofhuman heat balance in vehicles - Volvo's thermal manikin,Voltman, SAE Technical Paper 850042, 1985.
Elnäs S., Thermal climate in confined spaces-measurement and assessment using a thermalmanikin, SAE Technical Paper 881111, 1988.
Nilsson H., Holmér I., Impact of seat on thermal comfort, Proceedings of Indoor Air 93: The 6th International Conference on Indoor Air Quality and Climate, 6,127-132 Helsinki, Finland, 1993.
Bohm, M., Comparison of ınstruments for measurement of equivalent temperature in an experimental cab in a climatic chamber, EQUIV Report, Uppsala, Sweden, No: 3,1999.
Murakami, S., Kato, S. and Zeng, J., Flow and Temperature Fields Around Human Body with Various Room Air Distribution: CFD Study on Computational Thermal Manikin Part I. ASHRAE Transactions, 103(1), 3-15, 1997.
Murakami S., Kato, S., Zeng, J., Numerical simulation of contaminant distribution around a modelled human body: CFD Study on computational thermal manikin - Part II. ASHRAE Transactions, 104 (2), 226-233,1998.
Ashrae Handbook, Heating, Ventilating, and air conditioning, Applications SI Edition, Tullie Circle, 136-138, Atlanta, 2011.
Madsen T, Olesen B., Reid K., Otomotiv araçlarda termal çevre değerlendirilmesinde yeni yöntemler. ASHRAE Transactions, 92(1B), 38-54, 1986.