Experimental demonstration, modeling and analysis of a novel latent-heat thermal energy storage unit with a helical fin

Rozenfeld, Anatoly; Kozak, Yoram; Rozenfeld, Tomer; Ziskind, G.

doi:10.1016/j.ijheatmasstransfer.2017.03.020

Cited by 99 publications

(11 citation statements)

References 46 publications

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“…Both of them have already been applied to LHTES, with varying results depending on the adopted PCM and the system operating conditions. 26,27 All the geometrical features (fins number, dimensions and pitch, thickness, etc.) are always limited within the feasibility range imposed by the manufacturing company (see Table 3).…”

Section: Heat Transfer Surfacesmentioning

confidence: 99%

“…For the realization of the finned tube heat exchanger, two different possible configurations of the heat transfer surfaces were considered, respectively with radial and longitudinal fins. Both of them have already been applied to LHTES, with varying results depending on the adopted PCM and the system operating conditions 26,27 . All the geometrical features (fins number, dimensions and pitch, thickness, etc.)…”

Section: Context and Design Specificationsmentioning

confidence: 99%

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Experimental and model validation of a phase change material heat exchanger integrated into a real building

Triscari

Santovito²,

Bressan

et al. 2021

Intl J of Energy Research

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Latent heat thermal energy storages (LHTES) are a promising technology with a wide range of applications in the framework of energy efficiency improvement. Phase change materials provide a big storage capacity, but their thermal conductivities are always extremely low. The use of finned tube heat exchangers is nowadays the best solution to enhance PCMs thermal performances. This allows significant charging and discharging rates. The major challenge concerns the balance between thermal performances and high material costs. A proper design of the heat transfer surfaces is essential to limit the system overall cost. Two different heat exchangers solutions, with radial and longitudinal fins are here examined. The design of the LHTES is performed by deploying a simplified FEM numerical model specifically developed for the application. A validation procedure based on laboratory tests with a small LHTES prototype was also carried out. The obtained results confirmed the reliability of the numerical model and justify its adoption as a tool for the design phase. The FEM model allows to effectively simulate the system thermal behaviour and assess the impact of the different HEX geometrical parameters on thermal performances. Based on this information it was possible to perform the optimization of the heat transfer surfaces and to derive the best heat exchanger layout in terms of material usage. The results showed that the solution with longitudinal fins is the most efficient, with 215 kg of steel less required for the realization of the finned heat exchanger.

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Section: Heat Transfer Surfacesmentioning

confidence: 99%

Section: Context and Design Specificationsmentioning

confidence: 99%

Experimental and model validation of a phase change material heat exchanger integrated into a real building

Triscari

Santovito²,

Bressan

et al. 2021

Intl J of Energy Research

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show abstract

“…Fins or extended surfaces are the most common way for performance enhancement. Various fin configurations have been proposed and investigated by researchers, such as longitudinal fin [2], annular fin [3], helical fin [4] and bifurcated fin [5]. The results have demonstrated that the discharging/charging process can be significantly shortened by using fin surfaces.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of different melting performance enhancement structures in a shell-and-tube latent heat thermal energy storage system

et al. 2022

Renewable Energy

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“…Caron-Soupart et al [17] reported that the longitudinal and circular fins reduced the thermal storage density from 49.2 kWh/m 3 for tube with no-fins to 46.5 kWh/m 3 and 45.9 kWh/m 3 , respectively. In addition to longitudinal and circular fins, the other extended surfaces include helical and spiral fins [18,19], branched and snowflake fins [20,21], compact and plate fins [22,23], and pin fins [24,25]. In terms of design effectiveness, the type and orientations of extended surfaces in container are crucially influential for thermal reach and natural convection.…”

Section: Introductionmentioning

confidence: 99%

Role of extended fins and graphene nano-platelets in coupled thermal enhancement of latent heat storage system

Khan

2020

Energy Conversion and Management

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To bring modernisation in low carbon economy, the latent heat storage (LHS) systems are crucial for sustainable future of smart energy generation and management systems for renewable sources. This article provides in-depth numerical analyses of 3-dimensional computational models incorporating coupled thermal enhancement techniques for identifying optimal solution to guarantee higher charging rate, higher total enthalpy and better thermal distribution of LHS system. Paraffin is selected as phase change material (PCM), graphene nano-platelets (GNP) as nano-additives and longitudinal, circular and wire-wound fins as extended surfaces in vertical shell-and-tube configurations. Based on numerical analyses, the extended surfaces have registered better thermal distributions and charging rates as compared to nano-PCMs. The geometrical orientation of extended surfaces and volume concentration of nano-additives have significant influence on melt front movement, natural convection and heat transfer performance. The peak values of heat fluxes are significantly increased from 2.25 kW/m 2 for paraffin without thermal enhancement to 35.86, 47.23 and 88.13 kW/m 2 for nano-PCM with 1% GNP in circular, longitudinal and wire-wound fins configurations. Hence, the charging duration for capturing 11.09 MJ is significantly reduced to mere 1.02 h for wire-wound fins configuration as compared to 23.5 h for paraffin without thermal enhancement. Likewise, the charging rate of wire-wound fins configuration is 20.95%, 35.96% and 89.94% higher than circular fins, longitudinal fins and nano-PCMs without extended surfaces, respectively. Moreover, the increase in volume concentration from 1% to 5% has adverse implications on accumulative enthalpy, natural convection and charging rate. Therefore, the novel design of coupled enhancement with wire-wound fins configuration and nano-PCM with 1% GNP are established as optimum solution for potential wide-ranging practical utilisations of LHS system.

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Experimental demonstration, modeling and analysis of a novel latent-heat thermal energy storage unit with a helical fin

Cited by 99 publications

References 46 publications

Experimental and model validation of a phase change material heat exchanger integrated into a real building

Experimental and model validation of a phase change material heat exchanger integrated into a real building

Evaluation of different melting performance enhancement structures in a shell-and-tube latent heat thermal energy storage system

Role of extended fins and graphene nano-platelets in coupled thermal enhancement of latent heat storage system

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