Experimentally validated two dimensional numerical model for the solidification of PCM along a horizontal long tube
TL;DR: In this article, the authors presented the results of a numerical study validated by experimental measurements on the solidification of PCM along a horizontal tube by using the boundary immobilization technique.
About: This article is published in International Journal of Thermal Sciences.The article was published on 2014-01-01. It has received 49 citations till now. The article focuses on the topics: Finite volume method & Discretization.
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TL;DR: In this paper, the effect of number of inner tubes as a geometrical parameter during charging process was investigated and the consequences of increasing operational parameters including the HTF mass flow rate and inlet temperature were studied.
154 citations
TL;DR: In this paper, the authors assumed that there is no slip velocity between nanoparticles and paraffin and used FVM to show the treatment of NEPCM during melting and for verification, previous article was tested.
151 citations
TL;DR: In this article, a comprehensive review of cold storage technologies using solid-liquid phase change materials is presented, and the key issues to be solved in further research on cold storage technology are proposed.
100 citations
TL;DR: In this paper, a comparative thermal performance assessment is reported for vertical and horizontal orientation of shell and tube type Latent Heat Storage Unit (LHSU) using stearic acid (melting point of 55.7-56.6°C) and water as Heat Transfer Fluid (HTF).
Abstract: A comparative thermal performance assessment is reported for vertical and horizontal orientation of shell and tube type Latent Heat Storage Unit (LHSU) using stearic acid (melting point of 55.7–56.6 °C) as Phase Change Material (PCM) and water as Heat Transfer Fluid (HTF). Total 45 thermocouples are used in radial, axial and angular directions to measure the temperature distribution in the PCM. In horizontal LHSU, temperature in the upper half of the horizontal diametric plane reaches the melting point faster due to natural convection. As a result, the upper half melts earlier than the lower half. In order to demonstrate the motion of solid-liquid interface, liquid fraction contours are presented. For vertical LHSU, melting front moves in a conical fashion around the vertical plane with faster melting at upper axial locations. Experimental analysis suggests that horizontal LHSU is better for part load operation as compared to vertical LHSU, as it requires lesser time to melt half of the PCM mass. Energy storage/retrieval rate during melting and solidification is also compared for both the LHSU configurations.
73 citations
TL;DR: An attempt is made to assess the performance of multiple PCM based thermal storage systems by carrying out a comprehensive review of available literature on the topic.
Abstract: Latent heat thermal storage (LHTS) systems employing phase change materials (PCMs) offer several advantages compared to sensible heat storage units. However, they exhibit an inherent poor thermal performance owing to poor heat transfer, poor thermal conductivity of PCMs, and so on. Methods such as replacing single PCMs with multiple PCMs, addition of fins, micro/macro/nano-encapsulated composite PCMs and dispersion of high conductivity particles to PCMs have been suggested and studied in the past by different authors as a means for performance enhancement of LHTS systems. While extensive literature is available on the last three methods, studies on multiple PCMs are very limited. It is rather difficult at this stage to conclude on the benefits and merits/demerits of the method, given the limited data available in the open literature. Therefore, there is a need for consolidation and compilation of the existing literature to understand and assess the performance of LHTS units operating with multiple PCMs. An attempt is made in this paper to assess the performance of multiple PCM based thermal storage systems by carrying out a comprehensive review of available literature on the topic. Studies have evinced that single PCM units replaced with multiple PCMs offered superior performance with enhanced charging/discharging rates and better energy/exergy efficiencies. Also, past investigations reveal optimal melting temperatures of PCMs, optimal melting temperature difference between PCMs, optimal mass and so on to obtain an optimal performance of multiple PCM systems. Relevant published data were compared and discussed to understand the research trend over the years. Discussions were extended covering the challenges involved with multiple PCMs highlighting the scope for further research. An overall summary based on the survey has been presented for a concise understanding of key findings published in the open literature.
65 citations
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01 Jan 1980
TL;DR: In this article, the authors focus on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms.
Abstract: This book focuses on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms. Using simple algebra and elementary calculus, the author develops numerical methods for predicting these processes mainly based on physical considerations. Through this approach, readers will develop a deeper understanding of the underlying physical aspects of heat transfer and fluid flow as well as improve their ability to analyze and interpret computed results.
21,858 citations
TL;DR: In this article, a review of thermal energy storage (TES) for cold storage applications using solid liquid phase change materials has been carried out, focusing on different aspects: phase change material (PCM), encapsulation, heat transfer enhancement, and the effect of storage on food quality.
851 citations
20 Jul 2017
TL;DR: Finite Difference Methods in Heat Transfer as mentioned in this paper presents a step-by-step delineation of finite difference methods for solving engineering problems governed by ordinary and partial differential equations, with emphasis on heat transfer applications.
Abstract: Finite Difference Methods in Heat Transfer presents a clear, step-by-step delineation of finite difference methods for solving engineering problems governed by ordinary and partial differential equations, with emphasis on heat transfer applications The finite difference techniques presented apply to the numerical solution of problems governed by similar differential equations encountered in many other fields Fundamental concepts are introduced in an easy-to-follow mannerRepresentative examples illustrate the application of a variety of powerful and widely used finite difference techniques The physical situations considered include the steady state and transient heat conduction, phase-change involving melting and solidification, steady and transient forced convection inside ducts, free convection over a flat plate, hyperbolic heat conduction, nonlinear diffusion, numerical grid generation techniques, and hybrid numerical-analytic solutions
636 citations
622 citations