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Nanomaterials
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Nano-Enhanced Phase Change Materials
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Nano-Enhanced Phase Change Materials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanocomposite Materials".

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 5566

Special Issue Editors

Dr. Lioua Kolsi

E-Mail Website
Guest Editor
Department of Mechanical Engineering, College of Engineering, University of Hail, Hail, Saudi Arabia
Interests: heat and mass transfer; renewable energy; heat exchangers; CFD; nanofluids
Special Issues, Collections and Topics in MDPI journals
Dr. Hussein A. Mohammed

E-Mail Website
Guest Editor
WA School of Mines-Minerals, Energy & Chemical Engineering, Curtin University, Bentley 6102, WA, Australia
Interests: aerodynamics; instrumentation design/development and testing; fundamentals and advanced heat transfer aspects; fluid flow; refrigeration and air-conditioning; renewable energy studies (solar energy); nanomaterials (nanofluids) synthesis and characterisation; MEMS engineering and combustion science
Dr. Nidhal Ben Khedher

E-Mail Website
Guest Editor
Department of Mechanical engineering, University of Hail, Hail, Saudi Arabia
Interests: energy storage; phase change materials; NEPCM characterization; CFD; heat and mass transfer; renewable energy; drying; porous medium

Special Issue Information

Dear Colleagues,

Latent thermal energy storage using Phase Change Materials (PCM) has been known mainly as one of the best remedies to renewable energy intermittency. During the last decade, these promising PCM materials have attracted the attention of many researchers from different areas of interests. Therefore, PCMs are widely used in many industrial and engineering applications such as solar energy, air-conditioning, building envelopes, heat exchangers, thermoelectric cooling, refrigeration, etc.

Nevertheless, the main limitation of the use of PCMs in thermal systems is their low conductivity, which causes slow charging and discharging rate. To overcome this challenge, researchers have found that the dispersion of nanoparticles in PCMs, widely known as Nano-Enhanced-PCM (NEPCM), is an innovative solution allowing the enhancement of the PCMs thermophysical properties. Consequently, the performance of the thermal systems and devices working with NEPCM would be highly improved.

In this context, the present Special Issue will be dedicated to the latest advances in all the aspects related to the use of NEPCM.

The SI includes (but is not limited to) the following topics:

  • Renewable energy systems: Solar collectors, PV, PVT…
  • NEPCM Synthesis and Characterization
  • Energy storage
  • Theoretical, numerical, and experimental studies dealing with NEPCM
  • Thermoelectric cooling
  • Heat exchangers using PCM
  • Energy saving processes
  • Building envelopes and HVAC
  • Refrigeration systems using NEPCM

Dr. Lioua Kolsi 
Dr. Hussein A. Mohammed
Dr. Nidhal Ben Khedher
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • PCM
  • Nanoparticles
  • Nanofluid
  • Energy Applications

Published Papers (2 papers)

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Research

25 pages, 16684 KiB  
Article
Melting Enhancement in a Triple-Tube Latent Heat Storage System with Sloped Fins
by Mustafa Z. Mahmoud, Hayder I. Mohammed, Jasim M. Mahdi, Dmitry Olegovich Bokov, Nidhal Ben Khedher, Naif Khalaf Alshammari, Pouyan Talebizadehsardari and Wahiba Yaïci
Nanomaterials 2021, 11(11), 3153; https://doi.org/10.3390/nano11113153 - 22 Nov 2021
Cited by 32 | Viewed by 2118
Abstract
Due to the potential cost saving and minimal temperature stratification, the energy storage based on phase-change materials (PCMs) can be a reliable approach for decoupling energy demand from immediate supply availability. However, due to their high heat resistance, these materials necessitate the introduction [...] Read more.
Due to the potential cost saving and minimal temperature stratification, the energy storage based on phase-change materials (PCMs) can be a reliable approach for decoupling energy demand from immediate supply availability. However, due to their high heat resistance, these materials necessitate the introduction of enhancing additives, such as expanded surfaces and fins, to enable their deployment in more widespread thermal and energy storage applications. This study reports on how circular fins with staggered distribution and variable orientations can be employed for addressing the low thermal response rates in a PCM (Paraffin RT-35) triple-tube heat exchanger consisting of two heat-transfer fluids flow in opposites directions through the inner and the outer tubes. Various configurations, dimensions, and orientations of the circular fins at different flow conditions of the heat-transfer fluid were numerically examined and optimized using an experimentally validated computational fluid-dynamic model. The results show that the melting rate, compared with the base case of finless, can be improved by 88% and the heat charging rate by 34%, when the fin orientation is downward–upward along the left side and the right side of the PCM shell. The results also show that there is a benefit if longer fins with smaller thicknesses are adopted in the vertical direction of the storage unit. This benefit helps natural convection to play a greater role, resulting in higher melting rates. Changing the fins’ dimensions from (thickness × length) 2 × 7.071 mm2 to 0.55 × 25.76 mm2 decreases the melting time by 22% and increases the heat charging rate by 9.6%. This study has also confirmed the importance of selecting the suitable values of Reynolds numbers and the inlet temperatures of the heat-transfer fluid for optimizing the melting enhancement potential of circular fins with downward–upward fin orientations. Full article
(This article belongs to the Special Issue Nano-Enhanced Phase Change Materials)
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16 pages, 4579 KiB  
Article
Numerical Simulation of the Impact of the Heat Source Position on Melting of a Nano-Enhanced Phase Change Material
by Tarek Bouzennada, Farid Mechighel, Kaouther Ghachem and Lioua Kolsi
Nanomaterials 2021, 11(6), 1425; https://doi.org/10.3390/nano11061425 - 28 May 2021
Cited by 18 | Viewed by 2355
Abstract
A 2D-symmetric numerical study of a new design of Nano-Enhanced Phase change material (NEPCM)-filled enclosure is presented in this paper. The enclosure is equipped with an inner tube allowing the circulation of the heat transfer fluid (HTF); n-Octadecane is chosen as phase change [...] Read more.
A 2D-symmetric numerical study of a new design of Nano-Enhanced Phase change material (NEPCM)-filled enclosure is presented in this paper. The enclosure is equipped with an inner tube allowing the circulation of the heat transfer fluid (HTF); n-Octadecane is chosen as phase change material (PCM). Comsol-Multiphysics commercial code was used to solve the governing equations. This study has been performed to examine the heat distribution and melting rate under the influence of the inner-tube position and the concentration of the nanoparticles dispersed in the PCM. The inner tube was located at three different vertical positions and the nanoparticle concentration was varied from 0 to 0.06. The results revealed that both heat transfer/melting rates are improved when the inner tube is located at the bottom region of the enclosure and by increasing the concentration of the nanoparticles. The addition of the nanoparticles enhances the heat transfer due to the considerable increase in conductivity. On the other hand, by placing the tube in the bottom area of the enclosure, the liquid PCM gets a wider space, allowing the intensification of the natural convection. Full article
(This article belongs to the Special Issue Nano-Enhanced Phase Change Materials)
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