An approximate analytical solution for the movement of the phase change front in latent thermal energy storage heat exchangers

Beyne, Wim; Tassenoy, Robin; Paepe, Michel De

doi:10.1016/j.est.2022.106132

Cited by 10 publications

(22 citation statements)

References 34 publications

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“…The distinct melting regimes described in literature can be seen in the obtained front movement-curve. The experimental results are compared to a predicted phase change front behavior, based on an analytical model developed by Beyne et al [10]. It is seen that the analytical model overestimates the movement speed of the phase change front.…”

Section: Discussionmentioning

confidence: 99%

“…Next, this solution is integrated to determine the overall phase change fraction of the complete LTES heat exchanger. In [10] this analytical solution is verified for a planar geometry by comparing it to a numerical simulation. The results had small average deviations for the phase change fraction and effectiveness.…”

Section: Introductionmentioning

confidence: 88%

“…series of experiments on a tube in tube heat exchanger are conducted while the position of the phase change front is tracked over time. The observed results regarding the phase change front position are compared to the expected front position, based on the correlations from Beyne et al[10] and Mehling and Cabeza[11], mentioned above. The accuracy of the proposed analytical model is investigated.…”

mentioning

confidence: 91%

“…Therefore, there is a need for further research to develop more accurate and cost-effective analytical methods that can be used to design LTES heat exchanger systems with high efficiency and performance, for specific applications. Recently, Beyne et al [10] developed an analytical solution to predict the performance of LTES heat exchangers based on the heat transfer model of a cross section. A model is used for the local heat transfer under constant boundary conditions, based on the solution to the Stefan problem.…”

Section: Introductionmentioning

confidence: 99%

“…When this solution is integrated over the heat exchanger, the overall phase change fraction of the complete LTES system can be determined. Beyne et al [10] states that the phase change front moves linearly in time over the length of the tube. The time for the front to reach a certain vertical position is then given by Equation 1.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Prediction of the Phase Change Front Movement to Characterize Tube in Tube Phase Change Material Heat Exchangers

Goderis,

Van Zele,

Couvreur

et al. 2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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Tube in tube phase change material (PCM) heat exchangers have great potential as latent thermal energy storage (LTES) systems. However, sizing and designing these systems is still a challenge. Standard heat exchanger models cannot be applied due to the non-linear and transient heat transfer behavior of the PCM. Several alternative methods are suggested but these models are unable to predict the complete outlet state as a function of time. To fill this gap, an analytical model is derived to estimate the phase change front position as a function of time. It is proposed that the time the front needs to reach a certain vertical position is a linear function of the position. To validate the proposed analytical model, experiments are performed on a vertical tube in tube heat exchanger with varying inlet conditions. In the inner tube, water flows as heat transfer fluid (HTF). A paraffin is used as PCM in the outer tube. The phase change front position is evaluated at the outside of the tube. The movement of the phase change front is represented by plotting the vertical position of the front as a function of time. The position of the front is determined based on visual measurements using a camera placed next to the tube. By predicting the front position as a function of time, the performance of the heat exchanger can be determined. Different designs can be compared more easily, without needing to experimentally test or simulate, leading to a shorter and less expensive design phase for LTES systems, enhancing their large-scale roll-out.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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