Numerical study on free-surface jet impingement cooling with nanoencapsulated phase-change material slurry and nanofluid

AbstractThe temperature rise of photovoltaic’s cells deteriorates its conversion efficiency. The use of a phase change material (PCM) layer linked to a curved photovoltaic PV panel so-called PV-mirror to control its temperature elevation has been numerically studied. This numerical study was carried out to explore the effect of inner fins length on the thermal and electrical improvement of curved PV panel. So a numerical model of heat transfer with solid-liquid phase change has been developed to solve the Navier–Stokes and energy equations. The predicted results are validated with an available experimental and numerical data. Results shows that the use of fins improve the thermal load distribution presented on the upper front of PV/PCM system and maintained it under 42°C compared with another without fins and enhance the PV cells efficiency by more than 2%.

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Numerical Simulation of the Impact of the Heat Source Position on Melting of a Nano-Enhanced Phase Change Material

Nanomaterials ◽

10.3390/nano11061425 ◽

2021 ◽

Vol 11 (6) ◽

pp. 1425

Author(s):

Tarek Bouzennada ◽

Farid Mechighel ◽

Kaouther Ghachem ◽

Lioua Kolsi

Keyword(s):

Heat Transfer ◽

Phase Change ◽

Phase Change Material ◽

Numerical Study ◽

Melting Rate ◽

Heat Transfer Fluid ◽

Commercial Code ◽

Tube Position ◽

The Impact ◽

Change Material

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.

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Numerical study of the feasibility of coupling vacuum isolation panels with phase change material for enhanced energy-efficient buildings

Energy and Buildings ◽

10.1016/j.enbuild.2021.111369 ◽

2021 ◽

pp. 111369

Author(s):

Mingli Li ◽

Zhibin Lin

Keyword(s):

Phase Change ◽

Phase Change Material ◽

Energy Efficient ◽

Numerical Study ◽

Energy Efficient Buildings ◽

Change Material

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Nanoliquid jet impingement heat transfer for a phase change material (PCM) embedded radial heating system

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4052351 ◽

2021 ◽

pp. 1-10

Author(s):

Fatih Selimefendigil ◽

Hakan F. Oztop

Keyword(s):

Heat Transfer ◽

Phase Change ◽

Phase Change Material ◽

Jet Impingement ◽

Target Surface ◽

Spatial Average ◽

Average Heat ◽

Plate Spacing ◽

Impingement Heat Transfer ◽

Change Material

Abstract Nanoliquid impingement heat transfer with phase change material (PCM) installed radial system is considered. Study is performed by using finite element method for various values of Reynolds numbers (100 ≤ Re ≤ 300), height of PCM (0.25H ≤ hpcm = 0.7H ≤ 0.75H) and plate spacing (0.15H ≤ hpcm = 0.7H ≤ 0.40H). Different configurations with using water, nanoliquid and nanoliquid+PCM are compared in terms of heat transfer improvement. Thermal performance is improved by using PCM while best performance is achieved with nanoliquid and PCM installed configuration. At Re=100 and Re=300, heat transfer improvements of 26% and 25.5% are achieved with nanoliquid+PCM system as compared to water without PCM. Height of the PCM layer also influences the heat transfer dynamic behavior while there is 12.6% variation in the spatial average heat transfer of the target surface with the lowest and highest PCM height while discharging time increases by about 76.5%. As the spacing between the plates decreases, average heat transfer rises and there is 38% variation.

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