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Presentation by

VASANTH Vailoorof TRP Inc.

Nov - 2004

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Product Testing LabProduct Testing Lab

Need Recognized Over Two Years Ago

Characterize performance of Cooling Systems

Identify variables

Develop more effective products

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Engineering/Product DevelopmentEngineering/Product Development

Heat Transfer Expert Hired mid-2003

Lab Operational since January 2004

Phase One - Focus on baseline & Comparative Test Data

Aggressive Schedule

Phase Two - Product Enhancements and New Product

Development

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TestingTestingSchematicSchematic

101

105

100

104

106

107

103

102

Sketch not to Scale

Heater Tank

Radiator

108 to 115

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Association with External AgencyAssociation with External Agency

Diagnostic Solutions Condition Appraisal

Cooling SystemsFailure Analysis

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Laboratory facility: StateLaboratory facility: State--ofof--thethe--artart

The Heating Chamber

Flexible connectors

Adequate Heaters

The Test Articles

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The Monitoring and Control SystemThe Monitoring and Control System

64 Channels of Thermocouples

4 Thermalwells

LabView Software

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2 Energy metersThe Monitoring and Control System (contd)The Monitoring and Control System (contd)

2 Variacs

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Steady State ModelSteady State Model

Q = U*A*T - - - - (1)

Q and T are measured

A is a relatively simple calculated geometric factor

Determining the U or the heat transfer coefficient isthe final objective of this exercise

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Temperature ApproximationTemperature Approximation

))T)/(TTln((T

)T(T)T(TT

AmbAirBotOilHotAirTopOil

AmbAirBotOilHotAirTopOil

LM

=

- - (2)

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Steady State VerificationSteady State Verification

Temperature vers us Ti me

38.75

38.80

38.85

38.90

38.95

39.00

39.05

0 200 400 600 800 1000

T ime in s econds

Tempera

tureinC

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Heat Dissipation CurveHeat Dissipation Curve

Heat dissipated Q versus TAvg

0

2500

5000

7500

10000

12500

0 10 20 30 40 50 60 70

TAvg[C]

Heatdis

sipated,

Q[W]

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Heat Transfer CoefficientHeat Transfer Coefficient

Heat transfer Coefficient U versus

TAv g

y = 8.653E-03x + 7.108E-01

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

0 10 20 30 40 50 60 70

TAvg[C]

Heattransfercoefficient,U

[W*ft-2*C-1]

U = 8.653E-03*TAvg + 7.108E-01

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The Transient TestThe Transient Test

The transient test consists of two parts.

a) The Ramp test and

b) The Decay test

Q = m*Cp*(T/t) - - - - (3)

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The Transient Test (contd)The Transient Test (contd)

T = T0*(1-exp*t) - - - - (4)

= m*Cp/(U*A) - - - - - (5)

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The logThe log--log plot for Ulog plot for U

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Performance TablePerformance Table

Summary

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Summary (contd)Summary (contd)

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Manifolds for mounting Multiple RadiatorsManifolds for mounting Multiple Radiators

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Compare 15 and 520mm wide RadiatorsCompare 15 and 520mm wide Radiators

Reasons

a) Reduced plate spacing

b) End effects of finning

c) Smaller diameter of header

d) Oil passage / Oil holding capacity

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Initial Test ResultsInitial Test Results

19 Gage vs 18 Gage

15 Wide TRP Radiators have better HeatDissipation Characteristics than 520mm

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RecapRecap

Factors affecting the amount of heat dissipated

Width

Length/Height

Number of Plates

Header Size

Oil flow Capacity

Empty weight

Heat transfer area

Distance between plates

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Further DiscussionsFurther Discussions

QuestionsQuestions