Comparison of heat transfer between cylindrical and conical vertical shell-and-tube latent heat thermal energy storage systems

Seddegh, Saeid; Tehrani, S. Saeed Mostafavi; Wang, Xiaolin; Cao, Feng; Taylor, Robert A.

doi:10.1016/j.applthermaleng.2017.11.130

Cited by 123 publications

(14 citation statements)

References 24 publications

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“…The shell-and-coil TES with coil arranged at the bottom region of the tank has comparable performance to the simple annular TES geometry. A similar result has been received by Seddegh et al [19]. They have been experimentally studied cylindrical and conical-coil TES units during the melting and solidification process.…”

Section: Visual Analysis Of Solidification Processessupporting

confidence: 83%

Experimental Investigations on the Influence of Coil Arrangement on Melting/Solidification Processes

Andrzejczyk¹,

Kozak²,

Muszyński³

2020

Energies

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The latent heat thermal energy storage units are very popular because of their high energy density and almost close to constant temperature during the charging/discharging. In the present study has been proposed new shell-and-coil geometry with a shifted coil position to enhance the performance of phase change thermal magazine. The experimental investigations have been performed both for the melting and solidification process of coconut oil for constant wall temperature conditions. The experiments have been carried out for cylindrical as well as coil shape geometry of the TES unit. In the case of annular TES, the copper tube with outer diameter d = 10 mm and total length equal to 165 mm were used (4). In the case of shell-and-coil TES the coil has been also made of a copper tube but with an outer diameter d = 6 mm. The total length of the tube was 460 mm. However, the length of the tube element that has been used in the process of bending the coil had a total length equal to 360 mm. The rest of the tube was straight. The coil pitch was 15 mm and the outer coil diameter was 26 mm. The experiments have been conducted for the coil position at the top and the bottom of the tank. The results showed the influence of heat transfer geometry for phase change efficiency. The article presents the thermal characteristic of melting and solidification phenomena as well as their visual analysis. A significant impact of heat transfer geometry at the shape of the melting and solidification profile. The optimal performance has been achieved for shell-and-coil TES with a coil arranged at the top of the tank.

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Section: Visual Analysis Of Solidification Processessupporting

confidence: 83%

Experimental Investigations on the Influence of Coil Arrangement on Melting/Solidification Processes

Andrzejczyk¹,

Kozak²,

Muszyński³

2020

Energies

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“…The effect of geometric configuration on the thermal behavior of a vertical shell-and-tube LHTESS has been evaluated by S. Seddegh et al [17]. Two cylindrical and conical systems were compared experimentally to illustrate the effects of natural convection on heat transfer in the PCM during melting and solidification.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Fadl

Eames

2020

Energies

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In this study, the thermal performance of latent heat thermal energy storage system (LHTESS) prototype to be used in a range of thermal systems (e.g., solar water heating systems, space heating/domestic hot water applications) is designed, fabricated, and experimentally investigated. The thermal store comprised a novel horizontally oriented multitube heat exchanger in a rectangular tank (forming the shell) filled with 37.8 kg of phase change material (PCM) RT62HC with water as the working fluid. The assessment of thermal performance during charging (melting) and discharging (solidification) was conducted under controlled several operational conditions comprising the heat transfer fluid (HTF) volume flow rates and inlet temperatures. The experimental investigations reported are focused on evaluating the transient PCM average temperature distribution at different heights within the storage unit, charging/discharging time, instantaneous transient charging/discharging power, and the total cumulative thermal energy stored/released. From the experimental results, it is noticed that both melting/solidification time significantly decreased with increase HTF volume flow rate and that changing the HTF inlet temperature shows large impacts on charging time compared to changing the HTF volume flow rate. During the discharging process, the maximum power output was initially 4.48 kW for HTF volume flow rate of 1.7 L/min, decreasing to 1.0 kW after 52.3 min with 2.67 kWh of heat delivered. Based on application heat demand characteristics, required power levels and heat demand can be fulfilled by employing several stores in parallel or series.

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“…Compared to the HX with the circular inner tube (Figure 7a), the greatest reduction, by 11.6%, of complete melting-solidification time was obtained for the HX with the horizontal ellipse inner tube ( Figure 7b). Seddegh et al [85] compared the thermal performance of two DTHXs: Cylindrical and conical. Both HXs were oriented vertically and the same mass of PCM was placed in each HX.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

et al. 2020

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An application of latent heat thermal energy storage systems with phase change materials seems to be unavoidable in the present world. The latent heat thermal energy storage systems allow for storing excessive heat during low demand and then releasing it during peak demand. However, a phase change material is only one of the components of a latent heat thermal energy storage system. The second part of the latent heat thermal energy storage is a heat exchanger that allows heat transfer between a heat transfer fluid and a phase change material. Thus, the main aim of this review paper is to present and systematize knowledge about the heat exchangers used in the latent heat thermal energy storage systems. Furthermore, the operating parameters influencing the phase change time of phase change materials in the heat exchangers, and the possibilities of accelerating the phase change are discussed. Based on the literature reviewed, it is found that the phase change time of phase change materials in the heat exchangers can be reduced by changing the geometrical parameters of heat exchangers or by using fins, metal foams, heat pipes, and multiple phase change materials. To decrease the phase change material’s phase change time in the tubular heat exchangers it is recommended to increase the number of tubes keeping the phase change material’s mass constant. In the case of tanks filled with spherical phase change material’s capsules, the capsules’ diameter should be reduced to shorten the phase change time. However, it is found that some changes in the constructions of heat exchangers reduce the melting time of the phase change materials, but they increase the solidification time.

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Comparison of heat transfer between cylindrical and conical vertical shell-and-tube latent heat thermal energy storage systems

Cited by 123 publications

References 24 publications

Experimental Investigations on the Influence of Coil Arrangement on Melting/Solidification Processes

Experimental Investigations on the Influence of Coil Arrangement on Melting/Solidification Processes

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

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