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R. Bahrampoury

Bio: R. Bahrampoury is an academic researcher from K.N.Toosi University of Technology. The author has contributed to research in topics: Phase-change material & Heat exchanger. The author has an hindex of 21, co-authored 33 publications receiving 1262 citations.

Papers
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TL;DR: In this article, a combined experimental and numerical study has been designed to study thermal behavior and heat transfer characteristics of Paraffin RT50 as a phase change material (PCM) during constrained melting and solidification processes inside a shell and tube heat exchanger.

210 citations

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TL;DR: In this paper, a numerical investigation on geometric optimization of PCM-based pin fin heat sinks is presented, where Paraffin RT44HC is used as PCM while the fins and heat sink base is made of aluminum.

182 citations

Journal ArticleDOI
TL;DR: In this article, the effect of longitudinal fins in a double-pipe heat exchanger containing PCM is examined during charging process, where eight rectangular fins are mounted around the HTF (heat transfer fluid) carrying tube.

159 citations

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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

Journal ArticleDOI
TL;DR: In this article, the performance of a shell and tube heat exchanger subjected to inclination angle variation was investigated for modified Stefan numbers of 0.47, 0.53 and 0.59 and inclination angle rang from 0° to 90°.

103 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the authors focused on the classification of various paraffins and salt hydrates, and provided an understanding on how to maximize thermal utilization of PCM and how to improve the phase transition rate, thermal conductivity, latent heat storage capacity and thermo-physical stability.

484 citations

Journal ArticleDOI
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.

403 citations

Journal ArticleDOI
TL;DR: In this article, a comparative review of phase change material (PCM) based LHS performance enhancement methods is presented, which can be classified into three categories: using high thermal conductivity additives and porous media to enhance PCM thermal conductivities, using finned tubes and encapsulated PCMs to extend heat transfer surface, using multistage or cascaded LHS technique and thermodynamic optimization to improve the heat transfer uniformity.
Abstract: Latent heat storage (LHS) is considered as the most promising technique for thermal energy storage, due to its high energy storage density and nearly constant working temperature. However, the lower thermal conductivity of the phase change material (PCM) used in LHS system seriously weakens thermal energy charging and discharging rates. In order to improve the thermal performance of LHS system, a lot of research on performance enhancement have been carried out. This review paper will concern on the development of PCMs and performance enhancement methods for LHS system in the last decade. The available enhancement methods can be classified into three categories: using high thermal conductivity additives and porous media to enhance PCM thermal conductivity, using finned tubes and encapsulated PCMs to extend heat transfer surface, using multistage or cascaded LHS technique and thermodynamic optimization to improving the heat transfer uniformity. The comparative reviews on PCMs, corresponding performance enhancement methods and their characteristics are presented in present paper. That will help in selecting reliable PCMs and matching suitable performance enhancement method to achieve the best thermal performance for PCM based LHS system. In addition, the research gaps in performance enhancement techniques for LHS systems are also discussed and some recommendations for future research are proposed.

327 citations

Journal ArticleDOI
TL;DR: In this article, a review of heat transfer enhancement techniques between phase change material (PCM) and the heat transfer fluid (HTF) based on the application of fins embedded in the PCM is presented.
Abstract: The continuous increase in the level of green-house gas emissions and the depletion of fossil ‎fuels are identified, as the major driving forces behind efforts to effectively utilize different sources of renewable energy. Solar energy ‎considered one of the most prospective sources of this energy. This review paper mainly focuses on the majority of heat-transfer enhancement techniques between the phase-change material (PCM) and the heat-transfer fluid (HTF) based on the application of fins embedded in the PCM. This study ‎also investigated the geometrical dimensions, dimensionless numbers, and fin location through numerical ‎and experimental works conducted to assess the influences of these parameters on the thermal performance of PCM-latent heat thermal energy storage (LHTES) containers. The best enhancement is ‎achieved using the longitudinal finned configurations because of its easy design and fabrication, especially along circumference of the cylindrical PCM containers. The circular-finned tube was also more effective than the pinned-tube for different shell and tube. PCMs based on heat sinks with internal pin fins were widely used for the thermal ‎management of various pieces of electronic products. The heat enhancement factor was effectively dependent on increasing the numbers and dimensions ‎of these fins. Further researches still require to explore the ‎possible geometrical designs of fins and their key findings, which have more effect on the thermal performance of the ‎finned-LHTES system.

248 citations