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Research Papers: Heat Exchangers

Thermal Performance of Microencapsulated Phase Change Material Slurry in a Coil Heat Exchanger

[+] Author and Article Information
Min-Suk Kong

Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: mskong1223@tamu.edu

Kun Yu

Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: kuyu2001@163.com

Jorge L. Alvarado

Mem. ASME
Department of Engineering Technology
and Industrial Distribution,
Texas A&M University,
College Station, TX 77843
e-mail: jorge.alvarado@tamu.edu

Wilson Terrell, Jr.

Department of Engineering Science,
Trinity University,
San Antonio, TX 78212
e-mail: wterrell@trinity.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 31, 2014; final manuscript received January 19, 2015; published online March 24, 2015. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 137(7), 071801 (Jul 01, 2015) (8 pages) Paper No: HT-14-1501; doi: 10.1115/1.4029819 History: Received July 31, 2014; Revised January 19, 2015; Online March 24, 2015

An experimental study has been carried out to investigate the convective heat transfer and pressure drop characteristics of microencapsulated phase change material (MPCM) slurry in a coil heat exchanger (CHX). The thermal and fluid properties of the MPCM slurries were determined using a differential scanning calorimeter (DSC) and a rotating drum viscometer, respectively. The overall heat transfer coefficient and pressure drop of slurries at 4.6% and 8.7% mass fractions were measured using an instrumented CHX. A friction factor correlation for MPCM slurry in the CHX has been developed in terms of Dean number and mass fraction of the MPCM. The effects of flow velocity and mass fraction of MPCM slurry on thermal performance have been analyzed by taking into account heat exchanger effectiveness and the performance efficiency coefficient (PEC). The experimental results showed that using MPCM slurry should improve the overall performance of a conventional CHX, even though the MPCM slurries are characterized by having high viscosity.

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References

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Figures

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Fig. 1

Schematic diagram of experimental setup (dashed line denotes boundary for energy analysis)

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Fig. 3

Apparent and relative viscosities of MPCM slurries as a function of temperature

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Fig. 4

Pressure drop of MPCM slurries and water flowing through a CHX at different volumetric flow rates

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Fig. 5

Comparison of the friction factor between correlation and experimental data

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Fig. 6

Heat transfer rates of MPCM slurries and water flowing through a CHX at different volumetric flow rates

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Fig. 7

Overall heat transfer coefficients for MPCM slurries and water flowing through a CHX at different volumetric flow rates

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Fig. 8

Heat exchanger effectiveness of MPCM slurries and water flowing through a CHX as a function of NTU

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Fig. 9

PECs for MPCM slurries and water flowing through a CHX at different volumetric flow rates

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