Heat transfer performance of paraffin wax based phase change materials applicable in building industry

Sobolčiak, Patrik; Abdelrazeq, Haneen; Özerkan, Nesibe Gözde; Ouederni, Mabrouk; Nógellová, Zuzana; Al-Maadeed, Somaya; Karkri, Mustapha; Krupa, Igor

doi:10.1016/j.applthermaleng.2016.07.050

Cited by 55 publications

(18 citation statements)

References 43 publications

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“…Moreover, the height of the peak is lower for the samples with PW ( Figure 9 ), indicating that even though these samples show lower thermal conductivity, the considerable heat consumption of the PW plays a crucial role. In this respect, there is no visible peak of the PW phase change due to the fact that measurements were performed upon constant heating of 45 °C and checking the heat flow passing through the material and have different principle than that published by Sobolciak et al [ 42 ]. A combination of the capability to significantly reduce the amount of the heat energy passing through the sample and further possibility to store this energy within the sample structure provide a promising approach to the passive heat energy storage systems with excellent mechanical properties.…”

Section: Resultsmentioning

confidence: 90%

Foamed Phase Change Materials Based on Recycled Polyethylene/Paraffin Wax Blends

et al. 2021

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Foamed phase-change materials (FPCMs) were prepared using recycled linear low-density polyethylene (LLDPE) blended with 30 wt.% of paraffin wax (PW) and foamed by 1,1′-azobiscarbamide. The protection of pores’ collapse during foaming process was insured through chemical cross-linking by organic peroxide prior foaming. This work represents one of very few attempts for a preparation of polymeric phase change foams without a use of micro-encapsulated phase change component leading to the enhancement of the real PCM component (PW) within a final product. The porous structure of fabricated foams was analyzed using micro-computed tomography, and direct observation, and reconstruction of the internal structure was investigated. The porosity of FPCMs was about 85–87 vol.% and resulting thermal conductivity 0.054–0.086 W/m·K. Differential Scanning Calorimetry was used to determine the specific enthalpies of melting (22.4–25.1 J/g) what is the latent heat of materials utilized during a heat absorption. A stability of samples during 10 heating/cooling cycles was demonstrated. The phase change changes were also investigated using the dynamic mechanical analysis from 0° to 65 °C during the 10 cycles, and the mechanical stability of the system and phase-change transition were clearly confirmed, as proved by DSC. Leaching test revealed a long-term release of PW (around 7% of its original content) from samples which were long term stored at temperatures over PW melting point. This is the usual problem concerning polymer/wax blends. The most common, industrially feasible solution is a lamination of products, for instance by aluminum foils. Finally, the measurement of the heat flow simulating the real conditions shows that samples containing PW decrease the energy passing through the sample from 68.56 to 34.88 kJ·m−2. In this respect, FPCMs provide very effective double functionality, firstly common thermal insulators, and second, as the heat absorbers acting through melting of the PW and absorbing the excessive thermal energy during melting. This improves the heat protection of buildings and reduces temperature fluctuations within indoor spaces.

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Section: Resultsmentioning

confidence: 90%

Foamed Phase Change Materials Based on Recycled Polyethylene/Paraffin Wax Blends

et al. 2021

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“…However, while the temperature continued to rise to 100 °C or even higher, the portion of the thermal motion in the subsequent process constantly increases and overcomes the restriction. When the temperature decreases, the thermal motion of all the molecular chains is affected and the energy release becomes larger …”

Section: Resultsmentioning

confidence: 99%

Hyperbranched polyester-modified montmorillonite: a novel phase change material for energy storage

2017

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Hyperbranched polymer, montmorillonite (MMT) and phase change material (PCM) were used in the preparation of a novel energy storage clay material (H‐PCM). 1,3‐Diamino‐2‐propanol and methyl acrylate were firstly used in the synthesis of an AB2 intermediate. Then, Na‐MMT was modified by an intercalation agent, l‐glutamic acid. Third, hyperbranched polymer‐modified Na‐MMT (H‐MMT) was successfully fabricated using the amino acid‐modified Na‐MMT and AB2 intermediate. Subsequently, liquid paraffin was incorporated into H‐MMT, and non‐corrosive organic H‐PCM was prepared. This H‐PCM was systematically characterized using various methods, such as diffusion‐oozing circle test, differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, scanning electron microscopy, Fourier transform infrared spectroscopy and X‐ray diffraction (XRD). The diffusion‐oozing circle and DSC results revealed that H‐PCM possessed good heat storage and release capacity. In XRD analysis, expansions of the spacings in the plane were observed for all samples. TG analysis of this clay illustrated that it could be suitable for industrial applications due to its high thermal stability. © 2017 Society of Chemical Industry

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“…Some of these compounds have a low thermal conductivity which limits heat transmission, this latter representing a significant drawback in thermal exchange applications. However, the addition of fillers with high thermal conductivity could solve this problem; for instance, expanded graphite is widely used to increase the thermal conductivity of the PCMs [99,100,101,136].…”

Section: Pcms In Mortars: Potential and Issuesmentioning

confidence: 99%

Phase Change Materials for Energy Efficiency in Buildings and Their Use in Mortars

Frigione

Lettieri²,

Sarcinella³

2019

Materials

138

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The construction industry is responsible for consuming large amounts of energy. The development of new materials with the purpose of increasing the thermal efficiency of buildings is, therefore, becoming, imperative. Thus, during the last decades, integration of Phase Change Materials (PCMs) into buildings has gained interest. Such materials can reduce the temperature variations, leading to an improvement in human comfort and decreasing at the same time the energy consumption of buildings, due to their capability to absorb and release energy from/in the environment. In the present paper, recent experimental studies dealing with mortars or concrete-containing PCMs, used as passive building systems, have been examined. This review is mainly aimed at providing information on the currently investigated materials and the employed methodologies for their manufacture, as well as at summarizing the results achieved so far on this subject.

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Heat transfer performance of paraffin wax based phase change materials applicable in building industry

Cited by 55 publications

References 43 publications

Foamed Phase Change Materials Based on Recycled Polyethylene/Paraffin Wax Blends

Foamed Phase Change Materials Based on Recycled Polyethylene/Paraffin Wax Blends

Hyperbranched polyester-modified montmorillonite: a novel phase change material for energy storage

Phase Change Materials for Energy Efficiency in Buildings and Their Use in Mortars

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