Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Ricklefs, Alex; Thiele, Alexander M.; Falzone, Gabriel; Sant, Gaurav; Pilon, Laurent

doi:10.1016/j.ijheatmasstransfer.2016.08.013

Cited by 74 publications

(24 citation statements)

References 48 publications

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“…A general discussion with many examples was done by Felske [184], addressing an evaluation of the effective thermal conductivity when composite spheres were merged in continuous media. The proposal by Felske [184] has been recently extended and verified by Thiele et al [185] and Ricklefs et al [186] for predicting the effective thermal conductivity of composite materials with PCM capsules. The Mori-Tanaka principles were then used by [187] for obtaining the macroscopic thermal conductivity of composites considering the effect of the interfacial particle resistance and their size distribution.…”

Section: Macro-scale Modelsmentioning

confidence: 88%

Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites

2018

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Accumulating solar and/or environmental heat in walls of apartment buildings or houses is a way to level-out daily temperature differences and significantly cut back on energy demands. A possible way to achieve this goal is by developing advanced composites that consist of porous cementitious materials with embedded phase change materials (PCMs) that have the potential to accumulate or liberate heat energy during a chemical phase change from liquid to solid, or vice versa. This paper aims to report the current state of art on numerical and theoretical approaches available in the scientific literature for modelling the thermal behavior and heat accumulation/liberation of PCMs employed in cement-based composites. The work focuses on reviewing numerical tools for modelling phase change problems while emphasizing the so-called Stefan problem, or particularly, on the numerical techniques available for solving it. In this research field, it is the fixed grid method that is the most commonly and practically applied approach. After this, a discussion on the modelling procedures available for schematizing cementitious composites with embedded PCMs is reported.

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Section: Macro-scale Modelsmentioning

confidence: 88%

Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites

2018

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“…In most studies, paraffin as the PCM core material is encapsulated in a polymeric shell. Most microencapsulated PCMs used in concrete have either a polymethyl methacrylate (PMMA) [ 59 , 60 , 61 , 62 , 63 , 64 , 65 ] or melamine formaldehyde (MF) shell [ 63 , 66 , 67 , 68 , 69 , 70 ]. In one study, urea formaldehyde was used as a shell material [ 71 ].…”

Section: Phase Change Materials In Concrete Technologymentioning

confidence: 99%

“…For composites incorporating microencapsulated PCMs, Ricklefs et al [ 67 ] proposed the use of an equation based on Felske’s model [ 116 ]:

…”

Section: Modeling Of Pcm Compositesmentioning

confidence: 99%

Smart Crack Control in Concrete through Use of Phase Change Materials (PCMs): A Review

Šavija

2018

Materials

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Cracks in concrete structures present a threat to their durability. Therefore, numerous research studies have been devoted to reducing concrete cracking. In recent years, a new approach has been proposed for controlling temperature related cracking—utilization of phase change materials (PCMs) in concrete. Through their ability to capture heat, PCMs can offset temperature changes and reduce gradients in concrete structures. Nevertheless, they can also influence concrete properties. This paper presents a comprehensive overview of the literature devoted to using PCMs to control temperature related cracking in concrete. First, types of PCMs and ways of incorporation in concrete are discussed. Then, possible uses of PCMs in concrete technology are discussed. Further, the influences of PCMs on concrete properties (fresh, hardened, durability) are discussed in detail. This is followed by a discussion of modelling techniques for PCM-concrete composites and their performance. Finally, a summary and the possible research directions for future work are given. This overview aims to assure the researchers and asset owners of the potential of this maturing technology and bring it one step closer to practical application.

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“…In this case, the outer shell made of polymer (such as melamine formaldehyde) protects the encapsulated PCM. The thermal and mechanical properties of mortar incorporated with a micro encapsulated PCM have been extensively studied in literature [4][5][6][7][8][9][10]. A major drawback of using micro encapsulated PCMs is their negative influence on strength: The higher the amount of PCMs, the lower the strength.…”

Section: Introductionmentioning

confidence: 99%

Thermal Response of Mortar Panels with Different Forms of Macro-Encapsulated Phase Change Materials: A Finite Element Study

et al. 2019

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This paper presents a numerical investigation of thermal response of mortar panels, incorporating macro-encapsulated paraffin in different forms. Two types of macro capsules were fabricated and tested in this study using an instrumented hot plate device. The experimental results show that macro encapsulated paraffin reduced the temperature and increased time lag in the mortar panels due to the latent heat capacity of paraffin. Finite element models adopting the effective heat capacity method to model phase change effects were able to capture the overall thermal response of panels incorporated with paraffin well. Then, a parametric study was conducted using the validated finite element (FE) modelling technique to investigate the effects of different forms of macro capsules, the quantity of paraffin and the position of macro capsules. It was found that the tube and sphere macro capsules showed similar thermal responses, while the plate shaped capsules may cause a non-uniform temperature distribution in mortar panels. The quantity and position of paraffin have significant effects on the thermal response of the mortal panels. A higher paraffin content results in a significantly longer temperature lag and a lower temperature during the phase transition of paraffin. Furthermore, placing the paraffin away from the heating face can cause a longer temperature lag on the other face, which is desirable for building façade applications.

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Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Cited by 74 publications

References 48 publications

Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites

Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites

Smart Crack Control in Concrete through Use of Phase Change Materials (PCMs): A Review

Thermal Response of Mortar Panels with Different Forms of Macro-Encapsulated Phase Change Materials: A Finite Element Study

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