SEMINAR ON RADIATOR ABOUT DIFFERENT CONDITIONS.

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
1/26

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
2/26

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
3/26

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
4/26

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.
5/26

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

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

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
9/26

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

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 .
11/26

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.
12/26

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.
13/26

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
14/26

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
15/26

18.  Fin pitch influence
16/26

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.
17/26

20.  Louver angle influence
18/26

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.
19/26

22.  Coolant flow lay-out influence
20/26

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).
21/26

24.  2 pass increase cooling capacity.
 Design can be carried out by the with help
of pumping power.
22/26

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.
23/26

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.
24/26

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
25/26

28. 26/26