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PARAMETRIC STUDIES ON AUTOMOTIVE RADIATORS PRESENTED BY JACKSON JOHNY Roll No:127 GUIDED BY Mr. SUMESH C.K Assistant professor SREE CHITRA THIRUNAL COLLEGE OF ENGINEERING TVM-18

CONTENTS 1.INTRODUCTION 2.NECESSITY OF COOLING 3.TYPES OF RADIATOR 4.GEOMETRY DESCRIPTION 5.WORKING CONDITION 1/26

6. PARAMETRIC STUDIES ON RADIATOR  AIR AND COOLANT MASS FLOW INFERENCE  AIR INLET TEMPERATURE INFLUENCE  COOLANT FLUID INFUENCE  FIN PITCH INFLUENCE  LOUVER ANGLE INFERENCE  COOLANT FLOW LAYOUT INFLUENCE 7.CONCLUSION 8.REFERENCE 2/26

 An important role in its weight and also in the design of its front-end module.  The automotive industry is continuously involved in a strong competitive career to obtain the best automobile design in multiple aspects.  An experimental testing on two radiators of the same flow area but with the tubes in vertical or horizontal position. INTRODUCTION 3/26

 There are two type of automotive radiator. o Down flow type. o Cross flow type.  Parameters radiator are: o Air flow o Coolant flow o Material o Size 4/26

Necessity of cooling IC engine  To keep the engine at its most efficient operating temperature.  To control the pollution.  Safe guard the engine parts.  Higher the fuel efficiency.  To avoid excess engine oil consumption. 5/26

Types of automotive radiators  Down flow radiator type 6/26

 Cross flow radiator type Advantage : Lower styling profile. Reduce pressure. Efficient cooling 7/26

Geometry description of the automobile radiator under study  Core depth (mm) :23  Core height (mm) :133  Core length (mm) :184  Circuiting (passes) :I  Rows (no) :1  Total tubes (no) :12  Tube dimensions (mm) :22 *2.1  Tube thickness (mm) :0.32  Tube pitch (mm) :10.40  Fin pitch (mm) :1.19  Fin thickness (mm) :0.1  Louver angle ( O ) :26  Louver pitch (mm) :0.9 8/26

working conditions for the automobile radiator under stud y  Air inlet temperature (C) :25  Air inlet humidity (%) :50  Air mass flow (kg/s) :0.08/0.14/0.21/0.28/0.40  Coolant fluid :Water/ethylene glycol (50%)  Coolant inlet temperature (C) :95.0  Coolant mass flow (kg/h) :500/1000/1500/2000/2500 9/26

Parametric studies  Air and coolant mass flow influence 10/26

 Performance maps obtained for a parametric study (fin pitch, Fp, in this case). On the left, heat transfer dependence on air and coolant flow rates. On the right, overall enhancement vs. air and coolant flow. 11/26

The heat transfer and fluid-dynamic performance of an automotive radiator is strongly dependent on both thermal fluids mass flow. Cooling capacity increases with both air and coolant flow. Pressure drop on mass flow. 12/26

 AIR INLET TEMPERATURE INFLUENCE  The maximum coolant flow (2500 kg/h)has been selected.  The temperature ranges from 0to40C.  Heat transfer decreases with air inlet temperature raises. 13/26

 Coolant fluid influence  The selection of a particular coolant fluid is depend on the environmental conditions of certain country.  The radiator is analysed working with seven different thermal fluids: water, ethylene glycol,and propylene glycol 14/26

 The impact on the cooling capacity and the overall heat transfer coefficient is notable.  while ethylene glycol and propylene glycol report similar values for the same water content  little impact on the overall coolant pressure drop 15/26

 Fin pitch influence 16/26

 Fin pitch is one of the most important design parameters in this kind of heat exchangers.  Fin pitches from 0.6 to 2.4 mm have been considered.  UA has been taken as the enhancement parameter.  smaller fin spacing imply higher heat transfer capacity and air pressure drop at fixed air flow rate.  High coolant flow is provided. 17/26

 Louver angle influence 18/26

 The heat transfer enhancement mechanisms involved in a louvered automotive radiator.  Louver angle varies from 15 to35 degrees.  Best design solution could depend on the need of compactness and available pumping power. 19/26

 Coolant flow lay-out influence 20/26

 The proposed radiator has been studied under five liquid flow arrangements: 1 pass (I), 2 passes (U), 2 passes with bypass of different diameters: 3, 5 and 7 mm (Uby-3,Uby-5, Uby-7). 21/26

 2 pass increase cooling capacity.  Design can be carried out by the with help of pumping power. 22/26

Conclusions  Parametric study on automotive radiator help to design high performance radiator.  Performance of cooling system increases with increase in coolant circulation.  Heat exchange rate depend on the temperature gradient between radiator temperature and inlet air temperature.  Better coolant can increase cooling capacity. 23/26

REFERENCE  C. Oliet, A. Oliva *, J. Castro, C.D. Pe´rez-Segarra,Parametric studies on automotive radiators, Centre Tecnolo` gic de Transfere`ncia de Calor (CTTC), Universitat Polite`cnica de Catalunya (UPC), ETSEIAT, Colom 11, Terrassa (Barcelona), Spain.  C. Lin, J. Saunders, S. Watkins, The effect of changes in ambient and coolant radiator inlet temperatures and coolant flowrate on specific dissipation, SAE Technical Paper Series ( ), /26

 J.J. Juger, R.F. Crook, Heat transfer performance of propylene glycol versus ethylene glycol coolant solutions in laboratory testing, SAE Technical Paper Series SP-1456, ,  M. Gollin, D. Bjork, Comparative performance of ethylene glycol/ water and propylene glycol/water coolants in automobile radiators,SAE Technical Paper Series SP-1175, , 1996, pp. 115–123.  Dr.Kripal Singh,automobile engineering,vol-2.  25/26

26/26 TANK YOU