Phase change behavior of latent heat storage media based on calcium chloride hexahydrate composites containing strontium chloride hexahydrate and oxidation expandable graphite

Li, Xiang; Yuan, Zhenhong; Nian, Hongen; Ren, Xiaopeng; Ouyang, Deqin; Hai, Chunxi; Shen, Yanjun; Zeng, Jinbo

doi:10.1016/j.applthermaleng.2016.03.098

Cited by 46 publications

(17 citation statements)

References 19 publications

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“…However, its supercooling degree is up to 20 • C. Sutjahja [24] used SrCl 2 ·6H 2 O (1.0 wt %), Ba 2 CO 3 (0.5 wt %), and K 2 CO 3 (0.5 wt %) as additives to CaCl 2 ·6H 2 O. It was found that SrCl 2 ·6H 2 O exerted the best effect on CaCl 2 ·6H 2 O, this result was consistence with paper [25]. Palittin [26] adopted sonocrystallization method which used ultrasound radiation for promoting CaCl 2 ·6H 2 O to crystallize and results indicated this technique made crystals have uniform distribution and dense arrangement.…”

Section: Supercooling Of Salt Hydratessupporting

confidence: 55%

Inorganic Salt Hydrate for Thermal Energy Storage

et al. 2017

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Using phase change materials (PCMs) for thermal energy storage has always been a hot topic within the research community due to their excellent performance on energy conservation such as energy efficiency in buildings, solar domestic hot water systems, textile industry, biomedical and food agroindustry. Several literatures have reported phase change materials concerning various aspects. Among these materials, salt hydrates are worthy of exploring due to their high-energy storage density, rational price, multiple sources and relatively good thermal conductivity. This paper reviews the present state of salt hydrates PCMs targeting classification, properties, defects, possible solutions as well as their idiographic features which are suitable for applications. In addition, new trends of future research are also indicated.

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Section: Supercooling Of Salt Hydratessupporting

confidence: 55%

Inorganic Salt Hydrate for Thermal Energy Storage

et al. 2017

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“…It can be inferred that CaCl 2 ·2H 2 O, as an effective nucleation agent, can reduce the substantial supercooling of the PCM system, while nano SiO 2 particles have a positive effect in reducing supercooling. With the synergistic action of the two materials, the performances and properties of the newly developed PCM system can be better—especially in terms of supercooling—than reported in previous research [ 7 , 14 , 22 , 23 ]. We would like to mention here that no segregation occurred for all of the PCMs that were used in this research.…”

Section: Resultsmentioning

confidence: 88%

Preparation and Supercooling Modification of Salt Hydrate Phase Change Materials Based on CaCl2·2H2O/CaCl2

Dong

Memon

et al. 2017

Materials

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Salt hydrates have issues of supercooling when they are utilized as phase change materials (PCMs). In this research, a new method was adopted to prepare a salt hydrate PCM (based on a mixture of calcium chloride dihydrate and calcium chloride anhydrous) as a novel PCM system to reduce the supercooling phenomenon existing in CaCl2·6H2O. Six samples with different compositions of CaCl2 were prepared. The relationship between the performance and the proportion of calcium chloride dihydrate (CaCl2·2H2O) and calcium chloride anhydrous (CaCl2) was also investigated. The supercooling degree of the final PCM reduced with the increase in volume of CaCl2·2H2O during its preparation. The PCM obtained with 66.21 wt % CaCl2·2H2O reduced the supercooling degree by about 96.8%. All six samples, whose ratio of CaCl2·2H2O to (CaCl2 plus CaCl2·2H2O) was 0%, 34.03%, 53.82%, 76.56%, 90.74%, and 100% respectively, showed relatively higher enthalpy (greater than 155.29 J/g), and have the possibility to be applied in buildings for thermal energy storage purposes. Hence, CaCl2·2H2O plays an important role in reducing supercooling and it can be helpful in adjusting the solidification enthalpy. Thereafter, the influence of adding different percentages of Nano-SiO2 (0.1 wt %, 0.3 wt %, 0.5 wt %) in reducing the supercooling degree of some PCM samples was investigated. The test results showed that the supercooling of the salt hydrate PCM in Samples 6 and 5 reduced to 0.2 °C and 0.4 °C respectively. Finally, the effect of the different cooling conditions, including frozen storage (−20 °C) and cold storage (5 °C), that were used to prepare the salt hydrate PCM was considered. It was found that both cooling conditions are effective in reducing the supercooling degree of the salt hydrate PCM. With the synergistic action of the two materials, the performance and properties of the newly developed PCM systems were better especially in terms of reducing the supercooling degree of the PCM. The novel composite PCMs are promising candidates for thermal energy storage applications.

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“…For instance, some researchers [7,8,9] found that adding graphene (0.02 wt %) could reduce the supercooling degree of pure water. On other studies, Li et al [10,11] confirmed that SrCl 2 ·6H 2 O could reduce the supercooling of inorganic PCM. Therefore, it has been suggested that the usage of graphene oxide (GO) can be greatly reduced with the presence of SrCl 2 ·6H 2 O to have the effect on supercooling reduction.…”

Section: Introductionmentioning

confidence: 97%

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Jin

Tian

et al. 2018

Materials

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Although the inorganic salt hydrate phase change materials (PCMs) such as CaCl2·6H2O have promising potential for thermal energy storage in building application, the issue of supercooling has restricted their practical application. In this study, graphene oxide (GO) and SrCl2·6H2O as binary nucleation agents were used to modify CaCl2·6H2O and reduce its supercooling degree. Compared with pure CaCl2·6H2O, the incorporation of graphene oxide (GO)/SrCl2·6H2O reduced the supercooling degree to 0.3 °C significantly. In addition, the supercooling degree of modified CaCl2·6H2O after 200 thermal cycles was still much lower than that of non-modified CaCl2·6H2O. From the results of differential scanning calorimetry (DSC), the latent heat value and phase change temperature of the modified CaCl2·6H2O were 207.88 J/g and 27.6 °C, respectively. Aluminum capsules were used to encapsulate the modified PCM and placed inside the composite wallboard. The thermal performances of the composite wallboard with modified PCM were investigated using infrared thermography. Experimental results showed that the average temperature difference between the top and bottom surfaces of modified CaCl2·6H2O/wallboard composite after 1 h heating was kept around 15.8 °C, while it was 4.9 °C for the control wallboard. The above test results proved that the modified CaCl2·6H2O demonstrated good thermal performance and can be used in buildings to maintain thermal comfort.

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Phase change behavior of latent heat storage media based on calcium chloride hexahydrate composites containing strontium chloride hexahydrate and oxidation expandable graphite

Cited by 46 publications

References 19 publications

Inorganic Salt Hydrate for Thermal Energy Storage

Inorganic Salt Hydrate for Thermal Energy Storage

Preparation and Supercooling Modification of Salt Hydrate Phase Change Materials Based on CaCl2·2H2O/CaCl2

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

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