A comparative study on the performances of different shell-and-tube type latent heat thermal energy storage units including the effects of natural convection

Guangshun, Han; Ding, Hongsheng; Huang, Yun; Tong, Lige; Ding, Yulong

doi:10.1016/j.icheatmasstransfer.2017.09.009

Cited by 66 publications

(29 citation statements)

References 22 publications

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“…Double-tube heat exchangers (DTHXs) consist of two usually concentric tubes, which create two regions: The inner tube area, and the annulus area between the inner and the outer tube. Depending on which region a PCM and an HTF are located, there are two possible DTHX models: Pipe model and tube model [77,78], which are shown in Figure 5. Han et al [78] showed that the melting time of the PCM in the horizontal cylinder model DTHX was lower by 23.5% compared to the pipe model if the PCM mass and heat transfer surface area was equal in each case.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

“…Depending on which region a PCM and an HTF are located, there are two possible DTHX models: Pipe model and tube model [77,78], which are shown in Figure 5. Han et al [78] showed that the melting time of the PCM in the horizontal cylinder model DTHX was lower by 23.5% compared to the pipe model if the PCM mass and heat transfer surface area was equal in each case. A similar result was reported by Mahdi et al [79], who found that the melting time of the PCM was 43 and 18 min for pipe and cylinder model, respectively.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

“…However, in their An inclination angle of the DTHX impacts natural convection during melting [80], which might affect the thermal performance of the HX, but the results of research in this area are inconsistent. Han et al [78] concluded that there was almost no difference in melting time when cylinder model DTHX was placed horizontally or vertically. Moreover, it was found that the upward HTF flow direction ensured the shortest melting time in the cylinder and pipe model DTHX.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

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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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Section: Double-tube Heat Exchangersmentioning

confidence: 99%

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

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

et al. 2020

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“…Ebenfalls ist das Prinzip des indirekten Kontakts bereits bekannt. In , wird der Wärmeübergang an einem zylinderförmigen Rohr untersucht, das von Wärmeträgermedium durchflossen und von PCM umgeben ist. In wird als Wärmeträgermedium eine flüssige Salzschmelze und als Speichermedium werden zehn unterschiedliche Mischungen aus Salzen mit Schmelztemperaturen oberhalb 400 °C verwendet.…”

Section: Introductionunclassified

“…In wird als Wärmeträgermedium eine flüssige Salzschmelze und als Speichermedium werden zehn unterschiedliche Mischungen aus Salzen mit Schmelztemperaturen oberhalb 400 °C verwendet. In wird als Wärmeträgermedium Luft und als Speichermedium eine eutektische Mischung aus Kaliumnitrat und Natriumnitrat verwendet. In diesen Untersuchungen dienen die Messdaten als Grundlage für Simulationen, um den Schmelzprozess bzw.…”

Section: Introductionunclassified

Vergleich dreier Latentwärmespeicherkonzepte zur effizienten Nutzung von Niedertemperaturwärme

Kunkel

Kübel‐Heising

Wunder

et al. 2018

Chemie Ingenieur Technik

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Drei Speicherkonzepte, zur Speicherung thermischer Energie auf niedrigem Temperaturniveau, auf Basis der latenten Wärmespeicherung werden vorgestellt und miteinander verglichen. Untersucht werden ein Direktkontaktlatentwärmespeicher, ein Latentwärmespeicher mit gekapseltem Phasenwechselmaterial (PCM) und ein Wasserspeicher mit einem PCM‐Mantel. Die Speicher dienen zur effizienten Nutzung erneuerbarer Energien und Niedertemperaturabwärme. Als Speichermedium kommt ein Salzhydrat mit einem Schmelzpunkt von 27 °C zum Einsatz. Die Konzepte sowie entsprechende Anwendungen werden vorgestellt und experimentelle Ergebnisse diskutiert.

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Numerical analysis and optimization of the charging process on a shell‐and‐tube latent heat thermal energy storage unit for a solar power plant with direct steam generation

Deng

Zhu

Wang

et al. 2022

Energy Science & Engineering

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A two-dimensional model of the charging process on a heat storage unit in a shell-and-tube type latent heat subsystem of a solar power plant with direct steam generation was constructed in this study. The effects of the outer diameter to inner diameter ratio, aspect ratio, phase change material (PCM) thermal conductivity, and heat transfer fluid (HTF) mass flow rate were investigated. Results show that increasing the PCM thermal conductivity, HTF mass flow rate, and aspect ratio of the heat storage unit can shorten heat storage time, but the ratio of the outer diameter to the inner diameter of the heat storage unit has an optimal value of 6 in this problem. Using response surface methodology analysis, the influence of the aspect ratio, outer-to-innerdiameter ratio, PCM thermal conductivity, and HTF mass flow rate on the storage time of the phase change heat storage unit is in descending order.After a genetic algorithm optimization, the storage rate of the heat storage unit increased by 35%. The results of this study can guide the heat storage unit to achieve a better practical application performance.

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A comparative study on the performances of different shell-and-tube type latent heat thermal energy storage units including the effects of natural convection

Cited by 66 publications

References 22 publications

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

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

Vergleich dreier Latentwärmespeicherkonzepte zur effizienten Nutzung von Niedertemperaturwärme

Numerical analysis and optimization of the charging process on a shell‐and‐tube latent heat thermal energy storage unit for a solar power plant with direct steam generation

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