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Research Papers: Forced Convection

Real-Time Determination of Convective Heat Transfer Coefficient Via Thermoelectric Modules

[+] Author and Article Information
Nataporn Korprasertsak

School of Manufacturing Systems
and Mechanical Engineering,
Sirindhorn International Institute of Technology,
Thammasat University,
P.O. Box 22, Thammasat-Rangsit Post Office,
Pathum Thani 12121, Thailand
e-mail: nataporn.korp@gmail.com

Thananchai Leephakpreeda

School of Manufacturing Systems and
Mechanical Engineering,
Sirindhorn International Institute of Technology,
Thammasat University,
P.O. Box 22, Thammasat-Rangsit Post Office,
Pathum Thani 12121, Thailand
e-mail: thanan@siit.tu.ac.th

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 13, 2017; final manuscript received May 3, 2017; published online June 1, 2017. Assoc. Editor: Dr. Antonio Barletta.

J. Heat Transfer 139(10), 101701 (Jun 01, 2017) (8 pages) Paper No: HT-17-1020; doi: 10.1115/1.4036734 History: Received January 13, 2017; Revised May 03, 2017

In this paper, the determination of convective heat transfer coefficient under actual convection processes is proposed by using thermoelectric modules. The thermoelectric modules are positioned where cooling/heating processes take place. Based on the Seebeck effect and energy balance, voltage signals are mathematically related to the convective heat transfer coefficient in real time. In experiments, convective heat transfer coefficients of airflow in a wind tunnel are determined under heating/cooling processes at various wind speeds. The relative mean difference of the convective heat transfer coefficients between the proposed methodology and empirical formula is 2.31%. For real-time implementation, convective heat transfer coefficients of a copper plate, which is exposed to outdoor conditions during a whole day, are determined to predict copper plate temperatures from a governing equation. The performance of temperature prediction is confirmed by a coefficient of determination R2 of 0.9992. Analytical and experimental results show the effectiveness of the proposed thermoelectric modules in determining the convective heat transfer coefficient for air under actual cooling/heating conditions, in time.

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References

Figures

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Fig. 1

Convective heat transfer on a surface

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Fig. 2

Schematic diagram of thermoelectric module: (a) thermal part and (b) electrical part

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Fig. 3

Schematic structures: (a) lumped parameter models of thermoelectric module coupled with heat sink and (b) proposed thermoelectric modules

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Fig. 4

Determination of overall heat transfer coefficient via thermoelectric modules

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Fig. 5

Experimental rig for convective heat transfer under steady-state airflow

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Fig. 6

Plots of convective heat transfer coefficients against wind speed

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Fig. 7

Experiment of copper plate under heating/cooling air: (a) schematic diagram and (b) actual setup

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Fig. 8

Input data in time: (a) irradiance and air temperature, (b) voltages and temperatures of thermoelectric modules, (c) convective heat transfer coefficient, and (d) error function

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Fig. 9

Experimental results of temperature prediction for copper plate in time

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Fig. 10

Performance of temperature prediction via: (a) real-time determination of convective heat transfer coefficient and (b) constant convective heat transfer coefficient

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