Comparison of the Experimental Performance of Round and Flat Tube Automobile Radiators for Various Coolants

Yıl 2020, Cilt: 23 Sayı: 4, 1121 - 1130, 01.12.2020

Erkan Keklik , Murat Hoşöz

https://doi.org/10.2339/politeknik.555878

Cited By: 1

Öz

A
radiator test system was developed to test the heat transfer performance of automobile
radiators for various engine coolants. The system was made up from a
circulation pump, coolant reservoir, axial fan, electric heaters, PLC
controlled drivers and instruments for various mechanical measurements along
with the tested radiators. Two different radiators, namely round and flat tube
ones, and four different engine coolants, namely water, ethylene glycol, their
50/50 mixture and a commercial heat transfer oil, were tested. The experimental
heat dissipation rates of the radiators were evaluated under a broad range of
operating conditions. The air speed was changed between 2 and 4 m s^-1,
the coolant flow rate was varied between 0.1 and 0.3 l s^-1, and the
air temperature at the inlets of the radiators was changed between 25 and 35
°C, while the coolant temperature was fixed at 90 °C in all tests. The flat
tube radiator dissipated on average 4.8% more heat than the circular tube one
for water coolant, while it rejected on average 66.4% more heat than the
circular tube one for ethylene glycol. Furthermore, when the heat transfer oil
was used as coolant, the flat tube radiator dissipated on average 101.6% more
heat than the circular tube one. 

Anahtar Kelimeler

Engine cooling, radiator, coolant, automobile, ethylene glycol

Kaynakça

• [1] Heywood J. B., “Internal Combustion Engine Fundamentals”, Mc-Graw-Hill, Inc., New York, (1998).
• [2] Gollin M. and Bjork D., “Comparative performance of ethylene glycol/water and propylene glycol/water coolants in automobile radiators”, International Congress & Exposition, Detroit, Michigan, U.S.A., February 26-29, (1996).
• [3] Oliet C., Oliva A., Castro J. and Segarra C. D. P., “Parametric studies on automotive radiators”, Applied Thermal Engineering, 27: 2033-2043, (2007).
• [4] Sany A. R. E., Saidi M. H. and Neyestani J., “Experimental prediction of Nusselt number and coolant heat transfer coefficient in compact heat exchanger performed with ε-NTU method”, The Journal of Engine Research, 18: 62-70, (2010).
• [5] Peyghambarzadeh S. M., Hashemabadi S. H., Hoseini S. M. and Jamnani M. S., “Experimental study of heat transfer enhancement using water/ethylene glycol based nanofluids as a new coolant for car radiators”, International Communications in Heat and Mass Transfer, 38: 1283-1290, (2011).
• [6] Amrutkar P. S. and Patil S. R., “Automotive radiator sizing and rating – simulation approach”, IOSR Journal of Mechanical and Civil Engineering, 01-05, (2013).
• [7] Nieh H. M., Teng T. P. and Yu C. C., “Enhanced heat dissipation of a radiator using oxide nano-coolant”, International Journal of Thermal Sciences, 77: 252-261, (2014).
• [8] Sheikhzadeh G., Hajilou M. and Jafarian H., “Analysis of thermal performance of a car radiator employing nanofluid”, International Journal of Mechanical Engineering and Applications, 2: 47-51, (2014).
• [9] Vajjha R. S., Das D. K. and Ray D. R., “Development of new correlations for the Nusselt number and the friction factor under turbulent flow of nanofluids in flat tubes”, International Journal of Heat and Mass Transfer, 80: 353–367, (2015).
• [10] Ahmed S. A., Ozkaymak M., Sözen A., Menlik T. and Fahed A., “Improving car radiator performance by using TiO2-water nanofluid”, Engineering Science and Technology, an International Journal, 21: 996-1005, (2018).
• [11] Keklik E. and Hosoz M., “Development of a test rig for automotive radiators and preliminary tests using various engine coolants”, 9th international Automotive Technologies Congress, 559-568, Bursa, May 7-8, (2018).
• [12] Klein, S.A., “Engineering Equation Solver (EES) Software”, F-Chart Software, Madison, WI, (2016).
• [13] Patel B. M., Modi A. J. and Rathod P. P., “Analysis of engine cooling waterpump of car & significance of its geometry”, International Journal of Mechanical Engineering and Technology, 4: 100-107, (2013).
• [14] Tasuni M. L. M., Latiff Z. A., Nasution H., Perang M. R. M., Jamil H. M. and Misseri M. N., “Performance of a water pump in an automotive engine cooling system”, UTM Jurnal Teknologi, 78: 47-53, (2016).