Effect of inclination angle on the performance of a shell and tube heat storage unit – An experimental study

Kousha, N.; Hosseini, M.J.; Aligoodarz, Mohammad Reza; Pakrouh, R.; Bahrampoury, R.

doi:10.1016/j.applthermaleng.2016.10.203

Cited by 131 publications

(42 citation statements)

References 28 publications

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“…As commonly known, the heat transfer rate between the HTF and PCM is directly proportional to the heat transfer surface area, the temperature difference between the HTF and PCM, and the overall heat transfer coefficient. Regarding the heat transfer inside the PCM, the convection and conduction are the dominant heat transfer mechanisms during melting and solidification, respectively [12][13][14][15][16][17]. Hence, it was confirmed by numerous scientists that the melting process is faster than the solidification process [13,14,[18][19][20][21][22][23][24][25], and the heat exchangers should be designed in such a way that do not suppress the natural convection inside the PCM [16,26].…”

Section: Basics Of Heat Transfer In Lhtesmentioning

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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Section: Basics Of Heat Transfer In Lhtesmentioning

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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“…This is because natural convection dominates the charging process in the area above the heat transfer fluid (HTF) surface in the horizontal LHSU while the heat exchange in the area below the HTF surface is mainly by conduction. The discharging rate is, however, not affected by change in orientation as it is conduction dominant 29‐31 . Moreover, the poor thermal conductivity of PCMs influences the charging and discharging process.…”

Section: Introductionmentioning

confidence: 99%

Enrichment of heat transfer in a latent heat storage unit using longitudinal fins

et al. 2020

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The charging and discharging rates of a phase change material (PCM) in a horizontal latent heat storage unit (LHSU) is largely influenced by the lower thermal conductivity of the PCM. In the present research, four different configurations of longitudinal fins are proposed to augment the heat transfer in horizontal shell and tube type LHSUs. Numerical investigations are reported to establish the thermal performance augmentation with rectangular, triangular, and Y‐shaped (bifurcated) fins. From the results, it has been inferred that all fin configurations provide a faster charging and discharging rate. In the present set of geometric dimensions of LHSU considered, a reduction in charging time of 68.71% is evaluated for case III (three rectangular fins with one fin positioned in the area of the heat transfer fluid [HTF] surface) and case V (two bifurcated fins with one fin positioned in the area of the HTF surface). Moreover, overall cycle (charging + discharging) time is reduced by 58.3% for case III. Employment of fins results in a faster rate of absorption and extraction of energy from the PCM.

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“…[15][16][17][18][19] In this method, the governing equation is the same for both solid and liquid phases, and the solid-liquid interface is indicated by a mushy zone instead of being explicitly tracked. 18 The governing equations for the PCM are given as follows:…”

Section: Governing Equationmentioning

confidence: 99%

“…They concluded that the horizontal arrangement had superior thermal performance during the charging. Similarly, Kousha et al 19 experimentally studied the performance of a system subjected to various inclination angles. It was found that the angle variation affected the melting process more than the solidification process as a result of the dominance of convective heat transfer.…”

Section: Introductionmentioning

confidence: 99%

“…10 The main objectives of the researches on the shelland-tube system are to provide the guidelines for system optimization, [11][12][13][14] improve the total TES performance, 15,16 and analyze the parametric effects on the system. [17][18][19][20] Trp 11 numerically investigated the transient forced convective heat transfer between the tube wall and the HTF with moderate Prandtl numbers. Results showed that the heat transfer from the HTF to the PCM was limited by the Prandtl number.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of dynamic melting process in a thermal energy storage system using U-tube heat exchanger

Xiong

Yong

Yang

2017

Advances in Mechanical Engineering

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A thermal energy storage system using U-tube heat exchanger is proposed and compared with the system using singletube heat exchanger. Based on the enthalpy-porosity method, three-dimensional numerical models using computational fluid dynamics approach are developed to simulate the dynamic melting of phase change material in the two systems. Variable specific heat technique and combined conduction-convection heat transfer models are applied to achieve precise simulation. The model is first validated using published data, and then, the heat flux across the tube is used to evaluate the heat transfer performance of the two systems. Moreover, parametric studies are performed to analyze the effect of heat transfer fluid flow rate on the U-tube system by six different cases. The results show that during the melting of phase change material, vertical temperature stratification occurs in both systems as a result of the intensified natural convection. The results also demonstrate that the U-tube system has better heat transfer performance than the singletube system which has the same heat transfer area and boundary conditions, reducing the total charging time by 25%. Increasing the heat transfer fluid flow rate greatly enhances the heat transfer performance for the U-tube system, but further enhancement is limited by the fixed heat transfer area. This study provides an effective method to investigate the thermal behavior of thermal energy storage using phase change materials, and the results can be helpful in optimizing the future thermal energy storage design and practical applications.

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Effect of inclination angle on the performance of a shell and tube heat storage unit – An experimental study

Cited by 131 publications

References 28 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

Enrichment of heat transfer in a latent heat storage unit using longitudinal fins

Numerical investigation of dynamic melting process in a thermal energy storage system using U-tube heat exchanger

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