Design and Optimization of Compact Heat Exchanger – A … · A parametric study conducted using...

© Subros Limited. All rights reserved MATLAB EXPO 2014, PUNE

Design and Optimization of Compact Heat Exchanger – A Parametric Study

Anuj K Garg & Yogendra S KushwahNew Technology DepartmentSubros Limited, Noida, India


1. Subros Product Range OverviewNew Products RangeExisting Products Range

Compressors

Condenser Hose & Tubes

Car Aircon Systems Engine Cooling Systems

Refer Container+ AC

Rail A/C

Bus A/C

Cooling module

Commercial Vehicle ACs


Subros Heat Exchangers

RadiatorEvaporator Charge Air CoolerHeater Core Condenser


Aluminum Radiator


Heat Exchangers Fins

www.electronics-cooling.com

Offset Fin

Louvered Fin Plain Fin

Wave Fin


Louvered Fin type Heat Exchanger

Air InletVelocity

Air outlet

Velocity Vector Colored by static Temperature on central plane

Velocity Vector on central plane

Louvered Type fins

* Turbulence causes the much better mixing of air.


Objective : To understand the effect of broad parameters for the determination of the mostoptimum core matrix configuration for the fixed configuration (Configuration 1) based on thefollowing criteria:

Air Side Pressure dropQ/AWater Side Pressure DropQ/WQ/V

Method : A parametric (mathematical) model is developed to incorporate the effect of thefollowing parameters on the performance of the HX:

Fin PitchFin HeightTube HeightTube/Fin widthFin thicknessTube wall thickness

Data generated for 13650 cases with full factorial design of the experimentData Filtered based on the above mentioned design & optimization criterionResults & Discussion

Parametric Study


Wolverine Data Book

Mathematical Model– Air Side Heat transfer Coefficient


Wolverine Data Book

Mathematical Model– Water Side Heat transfer Coefficient


Wolverine Data Book

Mathematical Model– Air Side Pressure Drop Coefficient


SN Parameters Step Remarks1 Fin Height 0.1

2 Fin Pitch 0.1 Range in coherence with CFD results3 Fin Width 0.5 Kept same as tube width

4 Tube Height 0.1

5 Tube Width 0.5 Kept same as fin width

Parametric analysis to determine ideal core matrix –Input Parameters

Factorial design of experiment is chosen with 4 direct parameters with 21 levels of FinHeight x13 levels of Fin Pitch x 10 levels of Tube Height x 5 levels of Tube/Fin widthlevel totaling to 13650 test cases


Parametric study of radiator using Matlab


A parametric study conducted using Matlab shows that there exists a ratio of Fin height & Fin pitch for which theQ/A, Q/W, Q/V, Qv, etc maximizes. This is due to the fact that the Air side capacity and Coolant side capacitybecomes equal at this point.

For Fin height to Fin pitch equal to a certain value the Q/A, Q/W, Q/V, Qv becomes independent of the tubeheight

Also as the tube height is reduced the Q/A increases and Air side pressure drop decreases. However the waterside pressure drop increases significantly



Above graph shows saturation of the Q/A value fora given fin pitch for different values of the tubeheight thus giving an indication of the cutoff valuesfor the tube height. This graph along with pressuredrop curves will assist in selection of tube height

Multi-constraint – multi-objective optimization isconducted in order to narrow down on the mostfavorable core matrix for the given desiredperformance criteria.



Results and Conclusion


Results and Conclusion

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1790

100

110

120

130

140

150

160

170

180

190

Pa airQ/APa waterQ/WQ/VQv

Case

Per

form

ance

Per

cent

age

(%)


Thank You

Design and Optimization of Compact Heat Exchanger – A … · A parametric study conducted using...

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