Enhance heat transfer for PCM melting in triplex tube with internal-external fins
TL;DR: In this paper, the melting process in a triplex-tube heat exchanger with phase-change material (PCM) RT82.26 was numerically investigated using the Fluent 6.3.
About: This article is published in Energy Conversion and Management.The article was published on 2013-10-01. It has received 363 citations till now. The article focuses on the topics: Shell and tube heat exchanger & Plate fin heat exchanger.
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TL;DR: In this article, a wide scope of thermal energy storage field is discussed and the role of TES in the contexts of different thermal energy sources and how TES unnecessitates fossil fuel burning are explained.
707Â citations
TL;DR: In this paper, the authors present a review on various techniques of heat transfer enhancement in latent heat thermal energy storage (LHTES) systems, which can be achieved through either geometric configuration and/or thermal conductivity enhancement.
Abstract: This paper presents a state-of-the-art review on various techniques of heat transfer enhancement in latent heat thermal energy storage (LHTES) systems. Heat transfer enhancement in LHTES systems can be achieved through either geometric configuration and/or thermal conductivity enhancement. The use of extended surfaces such as fins or heat pipes is a common technique for heat transfer enhancement in LHTES systems and therefore, reviewed in details in this paper. Next, we studied the thermal conductivity enhancement techniques, which include the use of porous materials, nanoparticles with high thermal conductivity, and low-density materials. Finally, studies involving combined techniques for heat transfer enhancement are reviewed in the paper. The paper discusses research gaps in the methods of heat transfer enhancement for LHTES systems and proposed some recommendations.
403Â citations
TL;DR: In this paper, the effect of porosity and pore density on heat transfer, thermal conductivity, specific heat, latent heat and charging/discharging time are critically reviewed.
336Â citations
TL;DR: In this article, the experimental and theoretical methods to enhance the thermal conductivity of the phase change materials (PCMs) are summarized, and thermal conductivities inserts/additives in recent investigations are listed and summarized.
Abstract: Thermal energy storage systems have been recognized as one of the most efficient ways to enhance the energy efficiency and sustainability, and have received a growing attention in recent years. The use of phase change materials (PCMs) in building applications can not only improve the indoor thermal comfort but also enhance the energy efficiency. The necessity to enhance thermal conductivity of the PCMs is evident due to its low energy charging/discharging rates. Therefore, the high thermal conductivity additives or inserts to enhance thermal conductivity or to form the composite PCM are sought to achieve high energy charging/discharging rates. In this paper, the experimental and theoretical methods to enhance the thermal conductivity of the PCMs are summarized, and the thermal conductivity inserts/additives in recent investigations are listed and summarized. The evaluation of each thermal conductivity enhancement method is discussed.
279Â citations
TL;DR: In this paper, three mechanisms for augmenting heat transfer and the interaction of these methods to augment the performance of the system have been evaluated based on comparison with experimental data, outputs are very excellent fit with maximum 9.3% deviation.
251Â citations
References
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Book•
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.
21,858Â citations
TL;DR: In this article, the melting of pure gallium in a rectangular cavity has been numerically investigated using the enthalpy-porosity approach for modeling combined convection-diffusion phase change.
Abstract: The melting of pure gallium in a rectangular cavity has been numerically investigated using the enthalpy-porosity approach for modeling combined convection-diffusion phase change. The major advantage of this technique is that it allows a fixed-grid solution of the coupled momentum and energy equations to be undertaken without resorting to variable transformations. In this work, a two-dimensional dynamic model is used and the influence of laminar natural-convection flow on the melting process is considered. Excellent agreement exists between the numerical predictions and experimental results available in the literature. The enthalpy-porosity approach has been found to converge rapidly, and is capable of producing accurate results for both the position and morphology of the melt front at different times with relatively modest computational requirements. These results may be taken to be a sound validation of this technique for modeling isothermal phase changes in metallurgical systems.
1,377Â citations
TL;DR: In this paper, various heat transfer enhancement methods for latent heat thermal storage (LHTS) systems are discussed and three different experiments to augment heat transfer were conducted and the findings are reported.
483Â citations
TL;DR: In this paper, an experimental energy storage system has been designed using a horizontal concentric tube heat exchanger incorporating a medium temperature phase change material (PCM) Erythritol, with a melting point of 117.7°C.
456Â citations
TL;DR: In this paper, the authors investigated a method of enhancing the thermal conductivity of paraffin wax by embedding aluminum powder in it, which reduced the charging time by approximately 60%.
351Â citations