This document presents a parametric study on automotive radiators. It discusses the importance of cooling engines and describes the types and geometry of radiators. It then examines the effects of varying air and coolant mass flow, air inlet temperature, coolant type, fin pitch, louver angle, and coolant flow layout on the radiator's performance. The studies show that heat transfer and cooling capacity increase with higher air and coolant flows. Coolant type, fin pitch, louver angle, and flow layout also impact radiator efficiency. The document concludes that parametric studies help design high performance radiators and that heat exchange depends on temperature gradients between the radiator and inlet air.

1. WELCOME

2. 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

3. CONTENTS
1. INTRODUCTION
2. NECESSITY OF COOLING
3. TYPES OF RADIATOR
4. GEOMETRY DESCRIPTION
5. WORKING CONDITION
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4. 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
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5.  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
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6.  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
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7. 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.
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8. Types of automotive radiators
Down flow radiator type
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9.  Cross flow radiator type
• Advantage :
Lower styling
profile.
Reduce
pressure.
Efficient cooling
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10. 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

11. working conditions for the automobile
radiator under study
 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
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12. Parametric studies
Air and coolant mass flow influence
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13. 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 .
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14. • 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.
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15.  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.
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16. 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
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17.  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
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18.  Fin pitch influence
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19.  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.
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20.  Louver angle influence
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21.  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.
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22.  Coolant flow lay-out influence
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23.  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).
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24.  2 pass increase cooling capacity.
 Design can be carried out by the with help
of pumping power.
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25. 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.
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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, 08222 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 (2000-01-
0579), 2000.
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27.  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, 1999-01-0129,
 M. Gollin, D. Bjork, Comparative performance of ethylene
glycol/ water and propylene glycol/water coolants in automobile
radiators,SAE Technical Paper Series SP-1175, 960372, 1996, pp.
115–123.
 Dr.Kripal Singh,automobile engineering,vol-2.
 www.howautowork.com
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