Influence of fin orientation on the natural convection of aqueous-based nano-encapsulated PCMs in a heat exchanger equipped with wing-like fins

Shehzad, Sabir Ali; Alshuraiaan, Bader; Kamel, Mohammed Saad; Izadi, Mohsen; Ambreen, Tehmina

doi:10.1016/j.cep.2020.108287

Cited by 62 publications

(12 citation statements)

References 36 publications

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“…Using fins accelerate the melting and solidification processes, which shorten the time to reach the complete cycle. The thermal performance of PPCM is influenced by different parameters of fins such as their type, dimensions, spacing and number of fins [109,110]. Figure 7 shows the main shapes and designs of fins used for PPCM thermal conductivity enhancement purposes.…”

Section: Metallic Foam Paraffin/copper and Nickel Foamsmentioning

confidence: 99%

Paraffin As a Phase Change Material to Improve Building Performance: An Overview of Applications and Thermal Conductivity Enhancement Techniques

Al-Yasiri

Szabó

2021

Renew. Energy Environ. Sustain.

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In recent years, phase change materials (PCMs) have increasingly received attention in different thermal energy storage and management fields. In the building sector, paraffin as a phase change material (PPCM) has been introduced as an efficient PCM incorporated in a building envelope, which showed remarkable results. However, the poor thermal conductivity of PPCM is still the topmost drawback in experimental and numerical investigations. In this paper, a general assessment of paraffins, their common uses and applications, have been presented with a particular focus on their potential in building envelope applications. Moreover, the general and desired properties of PPCM are highlighted and evaluated. The primary practical limitation of PPCM of poor thermal conductivity and their effect on PPCM performance is presented and discussed. Correspondingly, the popular techniques applied to improve the poor thermal conductivity are presented and discussed in four categories: the dispersion of nanoparticles, expanded graphite, metallic foam, and extended surfaces technique (fins). All in all, the analysed research works indicated that PPCM based building envelope applications could remarkably improve the thermal performance of buildings in terms of thermal load reduction, energy-saving and thermal comfort. Furthermore, the adoption of enhancement techniques is essential to improve the thermal performance of PPCM in building applications for better utilisation. This review provides a clear vision for the newcomers and interested parties about the main application aspects of PPCM in the building sector for further investigations towards technology commercialisation.

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Section: Metallic Foam Paraffin/copper and Nickel Foamsmentioning

confidence: 99%

Paraffin As a Phase Change Material to Improve Building Performance: An Overview of Applications and Thermal Conductivity Enhancement Techniques

Al-Yasiri

Szabó

2021

Renew. Energy Environ. Sustain.

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“…It is commonly known that all PCMs have low thermal conductivity by nature. Therefore, many enhancement techniques have been applied to improve PCM thermal conductivity such as emersion of nanoparticles, metallic foam, expanded graphite, metal inserts, fins, and macroencapsulation with high thermal conductivity containers [29]- [34].…”

Section: Thermal Conductivitymentioning

confidence: 99%

Performance Assessment of Phase Change Materials Integrated with Building Envelope for Heating Application in Cold Locations

Al-Yasiri

Szabó

2021

EJENERGY

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Phase change materials (PCMs) are increasingly investigated in the last years as successful in many thermal energy storage applications. In the building sector, PCMs are utilised to improve building efficiency by reducing cooling/heating loads and promoting renewable energy sources, such as solar energy. This paper shows the recent research works on integrating PCMs with building envelope for heating purposes. The main PCM categories and their main characteristics are presented, focusing on PCM types applied for building heating applications. The main methods adopted to incorporate PCMs with building elements and materials are mentioned, and the popular passive and active incorporation techniques are discussed. Lastly, the main contribution to building energy saving is discussed in terms of heating applications. The analysed studies indicated that all PCMs could improve the building energy saving in the cold climates by up to 44.16% regardless of their types and techniques. Several conclusions and recommendations are derived from the analysed studies that are believed to be a guideline for further research.

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“…Sun et al [ 29 ] suggested and assessed novel fin architectures for PCM-based battery thermal control systems. They observed that the PCM-Fin system is capable of regulating the battery’s temperature increase even at a heat production rate of 20 W. Shehzad et al [ 30 ] investigated the impact of fin inclination and placement on the free convection of aqueous-based nano-encapsulated PCMs in a fin-equipped heat exchanger. The findings indicate that vertically oriented fin designs have superior thermal performance.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of a Melting Rate Enhancement inside a Thermal Energy Storage System of Finned Heat Pipe with Nano-Enhanced Phase Change Material

et al. 2022

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Thermal energy storage via the use of latent heat and phase transition materials is a popular technology in energy storage systems. It is vital to research different thermal enhancement techniques to further improve phase transition materials’ weak thermal conductivity in these systems. This work addresses the creation of a basic shell and a tube thermal storage device with wavy outer walls. Then, two key methods for thermal augmentation are discussed: fins and the use of a nano-enhanced phase change material (NePCM). Using the enthalpy–porosity methodology, a numerical model is developed to highlight the viability of designing such a model utilizing reduced assumptions, both for engineering considerations and real-time predictive control methods. Different concentrations of copper nanoparticles (0, 2, and 4 vol%) and wavenumbers (4,6 and 8) are investigated in order to obtain the best heat transmission and acceleration of the melting process. The time required to reach total melting in the studied TES system is reduced by 14% and 31% in the examined TES system, respectively, when NePCM (4 vol% nanoparticles) and N = 8 are used instead of pure PCM and N = 4. The finding from this investigation could be used to design a shell-and-tube base thermal energy storage unit.

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Influence of fin orientation on the natural convection of aqueous-based nano-encapsulated PCMs in a heat exchanger equipped with wing-like fins

Cited by 62 publications

References 36 publications

Paraffin As a Phase Change Material to Improve Building Performance: An Overview of Applications and Thermal Conductivity Enhancement Techniques

Paraffin As a Phase Change Material to Improve Building Performance: An Overview of Applications and Thermal Conductivity Enhancement Techniques

Performance Assessment of Phase Change Materials Integrated with Building Envelope for Heating Application in Cold Locations

A Numerical Investigation of a Melting Rate Enhancement inside a Thermal Energy Storage System of Finned Heat Pipe with Nano-Enhanced Phase Change Material

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