Thermal Behavior Mapping of a Phase Change Material Between the Heating and Cooling Enthalpy-temperature Curves

Delcroix, Benoit; Kummert, Michaël; Daoud, Ahmed

doi:10.1016/j.egypro.2015.11.612

Cited by 28 publications

(15 citation statements)

References 7 publications

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“…The transition process between the heating and cooling enthalpy-temperature curves in the case of incomplete phase change was investigated by Delcroix et al [34]. In their experiment, the PCM-equipped wall sample was quickly transferred from a cold to a hot environment and conversely.…”

Section: Pcm Use Efficiencymentioning

confidence: 99%

Novel Simulation Algorithm for Modeling the Hysteresis of Phase Change Materials

2020

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Latent heat thermal energy storage (LHTES) using phase change materials (PCM) is one of the most promising ways for thermal energy storage (TES), especially in lightweight buildings. However, accurate control of the phase transition of PCM is not easy to predict. For example, neglecting the hysteresis or the effect of the speed of phase change processes reduces the accuracy of simulations of TES. In this paper, the authors propose a new software module for EnergyPlus™ that aims to simulate the hysteresis of PCMs during the phase change. The new module is tested by comparing simulation results with experimental tests done in a climatic chamber. A strong consistency between experimental and simulation results was obtained, while a discrepancy error of less than 1% was obtained. Moreover, in real conditions, as a result of quick temperature changes, only a partial phase transformation of the material is often observed. The new model also allows the consideration of the case with partial phase changes of the PCM. Finally, the simulation algorithm presented in this article aims to represent a better way to model LHTES with PCM.

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Section: Pcm Use Efficiencymentioning

confidence: 99%

Novel Simulation Algorithm for Modeling the Hysteresis of Phase Change Materials

2020

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“…In this case, as well as in the opposite one, when the solidification procedure is interrupted, the `' behaviour may be ambiguous. For this reason, a specific approach has been used to describe interrupted heating and cooling phenomena based on the studies carried out by (Delcroix et al, 2015) and (D'Avignon and Kummert, 2016). According to them, when heating or cooling is stopped while the PCM goes through a phase transition, the specific heat curve (as well as the enthalpy curve) lies in between the melting and freezing ones.…”

Section: Phase Change Modellingmentioning

confidence: 99%

“…When the cooling process is stopped before the PCM had reached the solid state (point 2) and is heated up, `' trend will follow the average curve (black line) as in the interrupted heating phenomenon. Figure 11 -Interrupted cooling model for specific heat (Delcroix et al, 2015) All the energy balances equations just presented and used to describe the physical behaviour of the prototype have been implemented in the EES environment, forming a system of non-linear equations that are solved simultaneously by the software.…”

Section: Phase Change Modellingmentioning

confidence: 99%

Modelling and performance analysis of a new concept of integral collector storage (ICS) with phase change material

et al. 2019

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Solar Domestic Hot Water (SDHW) systems represent a constantly evolving technology in today's applications. With the new directives promoted by the European Union the renewable energy share produced in buildings will tend to increase further. Research on how to increase the efficiency of the thermal production from renewable energy are therefore of the foremost importance. This study aims to investigate the energy performance of an integral collector storage (ICS) prototype for DHW production. This ICS represents a new concept technology, integrating inside the same device a flat plate absorber and a storage section with phase change material (PCM) connected by heat pipes filled with methanol. An objective of this study was to investigate a possible alternative to conventional solar systems, with the aim of reducing investment costs and improving system reliability without compromising energy performance. The energy assessment was carried out using a numerical model in the Engineering Equation Solver (EES) environment, following an electrical analogy scheme. After a validation process by means of experimental data, a yearly simulation was launched in order to estimate the productivity and the solar fraction of the prototype. The results obtained allowed a global energy evaluation and a comparison with similar systems and to identify the pros and cons of this new technology.

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“…They further investigated and optimized different parameters of the phase change material, including the phase change temperature, phase change latent heat, thermal conductivity, and surface heat transfer coefficient. Delcroix 22 studied the transient characteristics of a phase change heat storage model using numerical simulations. He measured the heat storage time of different materials at the same working condition and developed a heat transfer model of the wall with the enthalpy method.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Thermal Performance of the Embedded Composite Phase Change Energy Storage Wall

et al. 2020

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In this study, the phase change paraffin and metal powder were mixed to form the composite phase change energy-storing material. This composite material was then injected into metal coil tubings at different coil spacings to form a composite phase change energy storage tubing system, which was then embedded in a wall. The thermal performance of the embedded phase change energy storage wall was investigated at various temperatures. The results showed that among the four types of aforementioned walls, the energy storage tubes at a spacing of 20 mm exhibited the smallest heat transfer and the largest surface heat storage coefficients. Therefore, this wall can block heat flow and temperature propagation effectively, and it exhibits excellent thermal insulating and heat storage performances and increased resistance to temperature fluctuations.

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Thermal Behavior Mapping of a Phase Change Material Between the Heating and Cooling Enthalpy-temperature Curves

Cited by 28 publications

References 7 publications

Novel Simulation Algorithm for Modeling the Hysteresis of Phase Change Materials

Novel Simulation Algorithm for Modeling the Hysteresis of Phase Change Materials

Modelling and performance analysis of a new concept of integral collector storage (ICS) with phase change material

Analysis of the Thermal Performance of the Embedded Composite Phase Change Energy Storage Wall

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