Thermal and geometrical investigation of an original double-pipe helical coil heat storage system with kock snowflake cross-section containing phase-change material

Najafabadi, Maryam Fallah; Rostami, Hossein Talebi; Ganji, D.D.

doi:10.1016/j.applthermaleng.2023.120244

Cited by 9 publications

(2 citation statements)

References 41 publications

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“…Studies on different internal and external duct geometries in SPPPES are quite limited. Mahdi et al and Nafajabadi et al obtained an increase in melting performance with spiral inner tube geometry with different cross-sectional areas [3,4].…”

Section: Introductionmentioning

confidence: 98%

Effect of inner channel geometry on solidification performance of phase change material (PCM) in double-pipe thermal energy storage

Kurşun,

Balta

2023

IJPTE

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Advantages such as high energy storage density and low heat losses have made phase change materials (PCMs) preferable in energy storage. However, the very low thermal conductivity of PCMs is the most important obstacle to improving melting and solidification performance of PCMs. To improve the thermal conductivity of PCM, the combination of PCM with nanoparticles, fins, and metal foam is among the methods widely researched in the literature. The innovation of this study was to examine the effect of inner and outer channel configurations on the solidification rate in double-pipe energy storage with PCM. Thus, it was aimed to benefit from the same amount of stored energy more and at a lower cost. In this regard, solidification analyses were carried out for three different basic inner channel geometries. With the triangle-in-circle configuration, the solidification rate was increased by 5.5% to 13.2% compared to other configurations. It is anticipated that the data obtained in this study will be a guide for novel inner channel geometry designs that will increase solidification performance and heat transfer in double-pipe energy storage with PCM.

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Section: Introductionmentioning

confidence: 98%

Effect of inner channel geometry on solidification performance of phase change material (PCM) in double-pipe thermal energy storage

Kurşun,

Balta

2023

IJPTE

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“…It was found that when the nanoparticles are homogeneously distributed in the cases with higher mixing, the heat transfer enhancement was augmented. Najafabadi et al 22 suggested shapes that raised the effective contact area at a constant volume to enhance the heat rate between water in the inner pipe and the phase-change material on the annulus side. Several geometrical and fluid parameters were examined to find the optimum case.…”

Section: Introductionmentioning

confidence: 99%

Enhancing heat transfer in double tube heat exchanger by nail rod inserts: numerical and experimental study

Marzouk,

Sharaf,

Almehmadi

et al. 2024

Preprint

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Double-tube heat exchanger (DTHX) is extensively utilized in many applications because of their small size, easy maintenance, and suitability for high-pressure applications. In this study, the heat transfer enhancement in a DTHX is studied experimentally and numerically by adding a nail rod insert (NRI). The study is performed with a steel nails rod insert 1000 mm long and a turbulence flow with a Reynolds number ranging from 3200 to 5700. Three different pitches of NRI such as 100 mm, 50 mm, and 25 mm are investigated. The attained results reveal that inserting nail rods raises the Nu number, and additional improvement can be attained by reducing pitch length. Nu number enhancement ratios for 25 mm pitch NRI are 1.81–1.9 times higher than the plain tube. Pressure drop rises in all configurations with NRI due to turbulence and obstructive NRI area. Among various pitch lengths, 25 mm exhibits the highest values of pressure drop where these values are overlooked concerning potential heat transfer improvements. Exergy efficiency rises across all cases with NRI, correlating with increased heat transfer, resulting in a 128% improvement in exergy efficiency for 25 mm pitch length. The numerical findings elucidate that the novel insert augments flow turbulence with secondary flows, thereby improving heat transfer in DTHX. A comprehensive analysis is presented with temperature, velocity, and pressure drop distributions from the numerical results.

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Efficient utilization of cold energy enabled by phase change cold storage brine gels with superior thermophysical properties towards biochemical reagent cold chain

Liu,

Wang,

et al. 2024

Applied Energy

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Thermal and geometrical investigation of an original double-pipe helical coil heat storage system with kock snowflake cross-section containing phase-change material

Cited by 9 publications

References 41 publications

Effect of inner channel geometry on solidification performance of phase change material (PCM) in double-pipe thermal energy storage

Effect of inner channel geometry on solidification performance of phase change material (PCM) in double-pipe thermal energy storage

Enhancing heat transfer in double tube heat exchanger by nail rod inserts: numerical and experimental study

Efficient utilization of cold energy enabled by phase change cold storage brine gels with superior thermophysical properties towards biochemical reagent cold chain

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