Solidification enhancement of PCM in a triplex-tube thermal energy storage system with nanoparticles and fins

Solidification enhancement of PCM in a triplex-tube thermal energy storage system with... •Solidification enhancement of PCM was modeled, validated, and investigated.•Nanoparticles-in-PCM, fins and combined fins with nanoparticles were applied.•Natural convection and Brownian motion of nanoparticles in PCM were also studied.•Fin/nanoparticle volume fractions were used to make the volume usage comparable. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Energy Elsevier

Solidification enhancement of PCM in a triplex-tube thermal energy storage system with nanoparticles and fins

Solidification enhancement of PCM in a triplex-tube thermal energy storage system with nanoparticles and fins

Applied Energy 211 (2018) 975–986 Contents lists available at ScienceDirect Applied Energy journal homepage: www.elsevier.com/locate/apenergy Solidification enhancement of PCM in a triplex-tube thermal energy storage system with nanoparticles and fins a,b a, Jasim M. Mahdi , Emmanuel C. Nsofor Department of Mechanical Engineering and Energy Processes, Southern Illinois University, Carbondale, IL 62901, USA Department of Energy Engineering, University of Baghdad, Baghdad 10071, Iraq HIGHLIGHTS Solidification enhancement of PCM was modeled, validated, and investigated. Nanoparticles-in-PCM, fins and combined fins with nanoparticles were applied. Natural convection and Brownian motion of nanoparticles in PCM were also studied. Fin/nanoparticle volume fractions were used to make the volume usage comparable. ARTICLE I NFO ABSTRACT Keywords: This study is on the application of nanoparticles and fins for improved phase change material (PCM) solidifi- Thermal energy storage cation in a heat exchanger. A major challenge in using PCMs is their poor thermal conductivities which con- Phase change material sequently prolongs phase change processes giving rise to very slow charging/discharging rates. This seriously Triplex-tube affects energy storage and recovery times, signifying the need for heat transfer enhancement in these systems. A Solidification model that considers heat conduction in the fins, natural convection in the liquid PCM, and Brownian motion of Nanoparticles nanoparticles in the PCM was developed and validated with experimental data in this study. The influence of Fins different dimensions of fins and volume concentrations of nanoparticles on PCM solidification evolution was studied. The effect of using fins alone, nanoparticles alone and combination of both on the solidification was investigated. Because of the extra added volume which limits available volume for PCM storage, the fin, na- noparticle and total volume fractions were...
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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0306-2619
D.O.I.
10.1016/j.apenergy.2017.11.082
Publisher site
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Abstract

•Solidification enhancement of PCM was modeled, validated, and investigated.•Nanoparticles-in-PCM, fins and combined fins with nanoparticles were applied.•Natural convection and Brownian motion of nanoparticles in PCM were also studied.•Fin/nanoparticle volume fractions were used to make the volume usage comparable.

Journal

Applied EnergyElsevier

Published: Feb 1, 2018

References

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