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Numerical Heat Transfer And Fluid Flow

An overview of thermal energy storage systems

Potential of macroencapsulated PCM for thermal energy storage in buildings: A comprehensive review

Solidification enhancement with multiple PCMs, cascaded metal foam and nanoparticles in the shell-and-tube energy storage system

As a class of thermal energy-storage materials, phase change materials (PCMs) play an important role in sustainable development of economy and society with a rapid increase in energy demand. Microencapsulation of solid–liquid PCMs has been recognized as a vital technology to protect them from leakage and running off and to give them a shape stability in the liquid state to offer the ease of handling and thus received tremendous attention from fundamental studies to industrial development in recent decades. Aiming to provide the most complete and reliable source of information on recent progress and current development in microencapsulated PCMs, this review focuses on methodologies and technologies for the encapsulation of PCMs with a variety of wall materials from traditional organic polymers to novel inorganic materials to pursue high encapsulation efficiency, excellent thermal energy-storage performance and long-term operation durability. We attempt to clearly summarize the selection of core and wall materials, synthetic methods, formation mechanisms and characteristic performance of microencapsulated PCMs to help scientists better understand their design principles and synthetic mechanisms. This review also highlights the diverse design of bi- and multi-functional PCM-based microcapsules by fabricating various functional shells in a multilayered or hierarchical structure to provide a great potential to meet the growing demand for versatile applications. We also provide insights on the future research and development direction of microencapsulated PCMs with multifunctional applications in energy efficiency, sustainable processes, high-tech energy management and specific physicochemical effectiveness.

Innovative design of microencapsulated phase change materials for thermal energy storage and versatile applications: a review

Generally, the commercial and industrial electronic devices are required to be operated under 100 °C.Therefore, there is a need to remove heat effectively from these devices under different loading conditions. Till now, Phase Change Material (PCM) based heat sinks are emerging as one of the effective techniques for removal of heat from the electronic devices. However, the low thermal conductivity of PCM situates a hindrance to the development. Thus, current research focuses on improving the thermal performance of PCM using thermal conductivity enhancer (TCE). At present internal fins, metallic foams and nano particles are mixed with PCM to enhance the performance of heat sinks. These are called as thermal conductivity enhancers. This article reviews methodologically various papers on the methods used for enhancement of PCM performance in cooling of electronic components. The effect of various parameters influencing the performance of the TCE-PCM based heat sinks are discussed in systematic order. The performance of these heat sinks under constant and variable thermal load are also evaluated. Out of these three TCE, metallic foams in heat sinks provides a higher surface area to volume ratio, good thermal conductivity and considerable weight advantage.

Application of TCE-PCM based heat sinks for cooling of electronic components: A review

Phase change materials for pavement applications: A review

Application of the discrete transfer method is extended to solve transient radiative transport problems with participating medium. A one-dimensional gray planar absorbing and anisotropically scattering medium is considered. Both boundaries of the medium are black. The incident boundary of the medium is subjected to pulse-laser irradiation, while the other boundary is cold. For radiative parameters such as optical thickness, scattering albedo, anisotropy factor, transmittance, and reflectance at the boundaries are found. Results obtained from the present work are compared with those available in the literature. The discrete transfer method has been found to give an excellent agreement.

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Discrete Transfer Method Applied To Transient Radiative Transfer Problems in Participating Medium

A pore-scale numerical model is presented for simulating the melting of phase change material (PCM) in a PCM-metal foam composite energy storage system. Instead of considering volume averaged domain for simulating the melting process, the present model resolves the geometry of the metal foam. Thus it can capture the effects of geometrical parameters such as the pore size and pore distribution as well as the localized heat transfer at the metal foam PCM interface more accurately. The model also incorporates the effect of convection on the melting process. The developed model comprises of a geometry creation model for generating the foam structure considering metal foam as overlapping circular pores of different pore radius. Heat transfer, phase change and convection are solved using an enthalpy based finite volume model. The model is validated with experimental results given in literature. Subsequently, the effect of convection on melting and energy storage rate in PCM-metal foam composite systems is studied for different pore size and different porosity of metal foam. Results indicate that the effect of convection is higher for higher porosity and larger pore size.

Prasenjit Rath

Papers

Application of TCE-PCM based heat sinks for cooling of electronic components: A review

Phase change materials for pavement applications: A review

Discrete Transfer Method Applied To Transient Radiative Transfer Problems in Participating Medium

Effect of convection on melting characteristics of phase change material-metal foam composite thermal energy storage system

Numerical study of phase change material based orthotropic heat sink for thermal management of electronics components