Cfd study on the thermal performance of n-octadecane (pcm) doped with graphene nanoparticles as a potential thermal energy storage medium for trombe walls

Chukwumaobi K. Oluah*, Esther T. Akinlabi, Howard O. Njoku

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


Thermal energy storage is one of the methods used in reducing energy consumption and heat recovery from thermal systems. Some of the major applications of heat storage systems are in buildings, solar energy technologies, and waste heat recovery from high-temperature applications. Thermal energy storage could be in the form of sensible heat, latent heat, or chemical heat arising from bond breaking and formation in chemical reactions. Among all these forms of solar energy storage aforementioned, latent heat thermal energy storage is greatly explored because it is generally safe to use and its ability to store a large quantity of heat in a relatively small volume. Phase change materials (PCMs) are widely used in latent heat thermal energy storage systems. Some of the setbacks encountered with the use of PCMs are its low-thermal conductivity and subcooling characteristics. Nanoparticles have been found very useful in improving the thermal conductivity of PCMs, thereby improving its general performance. The nano-PCM considered in this work is (graphene + octadecanol). The top surface of the nano-PCM enclosure was exposed to ambient solar radiation. The solar radiation data for Johannesburg (26.2041° S, 28.0473° E) was used for the simulation. A two-dimensional heat transfer equation was solved numerically using initial, boundary, and phase transition conditions. The effect of volume fractions of nanoparticles on the melt fractions was investigated. From the result obtained, the PCM with 4% loading of nanoparticles yielded the best result.

Original languageEnglish
Title of host publicationAdvances in Manufacturing Engineering - Selected Articles from ICMMPE 2019
EditorsSeyed Sattar Emamian, Farazila Yusof, Mokhtar Awang
Number of pages15
ISBN (Print)9789811557521
Publication statusPublished - 2020
Externally publishedYes
Event5th International Conference on Mechanical, Manufacturing and Plant Engineering, ICMMPE 2019 - Kuala Lumpur, Malaysia
Duration: 19 Nov 201921 Nov 2019

Publication series

NameLecture Notes in Mechanical Engineering
ISSN (Print)2195-4356
ISSN (Electronic)2195-4364


Conference5th International Conference on Mechanical, Manufacturing and Plant Engineering, ICMMPE 2019
CityKuala Lumpur

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