Experiment study on the thermal properties of paraffin/kaolin thermal energy storage form-stable phase change materials

Lv, Peizhao; Liu, Chenzhen; Rao, Zhonghao

doi:10.1016/j.apenergy.2016.08.147

Cited by 170 publications

(41 citation statements)

References 42 publications

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“…The crystallinity should also be taken into account due to the huge influence on heat capacity. [38] Figure 2b exhibits the crystallinity of SA in HNO 3 -treated samples, which is calculated according to the equations referred in the earlier study. [39] When the pH level is less than 2, the composites display the slump crystallinity value.…”

Section: Crystallinity Of Compositesmentioning

confidence: 99%

Thermal Performance and Interfacial Aspects of Kaolinite‐Based Stearic Acid Composite in the Presence of Nitric Acid

Yang

Zuo

et al. 2019

ChemistrySelect

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The effect of nitric acid on the thermal performance of stearic acid/kaolinite (SA/Kaol) composite phase change materials (PCMs) was studied. SA/Kaol was subjected to HNO3 manipulations at different acidity conditions. The results indicated that inferior thermal properties were detected at the acid‐treated composites with pH < 2. The latent heat value of SA/Kaol‐0.5 demonstrated an obvious reduction of about 30% compared with that of SA/Kaol, and its supercooling extent could reach as many as 11.2 °C while that of SA/Kaol was only 1.4 °C. Based on interfacial reaction analysis, the reduced crystallinity of SA should be attributed to the confinement effect originated from acid molecular clusters, while the supercooling behavior was caused by external ions. These ions could hinder SA molecules from adsorbing to the surface of crystal nucleus and thus delay the solidification process. As a result of segregation effect, the latent heat value of acid‐treated samples was deteriorated but the supercooling extent was relieved during thermal cycles. This work was the first that reported the effect of nitrogen oxides on PCMs. We believe that the results could play an enlightening role in the stability study of thermal property during PCMs practical applications.

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Section: Crystallinity Of Compositesmentioning

confidence: 99%

Thermal Performance and Interfacial Aspects of Kaolinite‐Based Stearic Acid Composite in the Presence of Nitric Acid

Yang

Zuo

et al. 2019

ChemistrySelect

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“…After they were cooled down to room temperature for 2 h, the composites were formed. Then, the leakage tests were carried out though the simple and effective method reported by the literature 47-50 [47][48][49][50]. Secondly, the CA/CIT sample without leakage and maximum adsorption capacity of CA was mixed with 1 wt.%, 3 wt.%, 3 wt.%, and 7 wt.% CNT in 25 mL beakers, respectively.…”

Section: Preparation Of Fspcmmentioning

confidence: 99%

Fabrication and Thermal Properties of Capric Acid/Calcinated Iron Tailings/Carbon Nanotubes Composite as Form-Stable Phase Change Materials for Thermal Energy Storage

Liu

Zhang

et al. 2019

Minerals

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In this study, a novel form-stable phase change material (FSPCM) consisting of calcination iron tailings (CIT), capric acid (CA), and carbon nanotubes (CNT) was prepared using a simple direct melt impregnation method, and a series of tests have been carried out to investigate its properties. The leakage tests showed that CA can be retained in CIT with a mass fraction of about 20 wt.% without liquid leakage during the phase change process. Moreover, the morphology, chemical structure, and thermal properties of the fabricated composite samples were investigated. Scanning electron microscope (SEM) micrographs confirmed that CIT had a certain porous structure to confine CA in composites. According to the Fourier transformation infrared spectroscope (FTIR) results, the CA/CIT/CNT FSPCM had good chemical compatibility. The melting temperature and latent heat of CA/CIT/CNT by differential scanning calorimeter (DSC) were determined as 29.70 • C and 22.69 J/g, respectively, in which the mass fraction of CIT and CNT was about 80 wt.% and 5 wt.%, respectively. The thermal gravity analysis (TGA) revealed that the CA/CIT/CNT FSPCM showed excellent thermal stability above its working temperature. Furthermore, the melting and freezing time of CA/CIT/CNT FSPCM doped with 5 wt.% CNT reduced by 42.86% and 54.55% than those of pure CA, and it showed better heat transfer efficiency. Therefore, based on the above analyses, the prepared CA/CIT/CNT FSPCM is not only a promising candidate material for the application of thermal energy storage in buildings, but it also provides a new approach for recycling utilization of iron tailings.

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“…erefore, it is very significant and promising direction of the research to study the characteristic of the PCMs. Lv et al [9] have detailed a study on the thermal properties of paraffin/kaolin PCM. e results showed that the paraffin/kaolin composite with largest particle size of kaolin has the highest thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Microstructure of Potassium Nitrate/Sodium Nitrate Composites for Solar Storage System

Mao

Liu

et al. 2019

Advances in Materials Science and Engineering

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The performance of the material is determined by its structure, i.e., the composition of the material elements of the atomic structure, the molecular structure, and atoms or molecules in space arrangement and the aggregation characteristics. The microstructure of the material has important implications for the material performance. In this paper, five phase change materials, potassium nitrate, sodium nitrate, and the composites of KNO3-NaNO3/graphite (3%, 6%, and 9%), have been studied by the experiment, and the aim is to improve the storage performance of the solar storage system. The results show that potassium nitrate and sodium nitrate are significantly different in microstructure, that is, potassium nitrate is a layered structure and the sodium nitrate is a network structure. And, the graphite as additives can be physically combined with the molten salts, which leads to a different performance and distribution in the mixture. Therefore, it is an effective method in improving the performance of molten salts by using graphite as the supporting material. The results can provide a reference to future choose for solar storage materials.

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Experiment study on the thermal properties of paraffin/kaolin thermal energy storage form-stable phase change materials

Cited by 170 publications

References 42 publications

Thermal Performance and Interfacial Aspects of Kaolinite‐Based Stearic Acid Composite in the Presence of Nitric Acid

Thermal Performance and Interfacial Aspects of Kaolinite‐Based Stearic Acid Composite in the Presence of Nitric Acid

Fabrication and Thermal Properties of Capric Acid/Calcinated Iron Tailings/Carbon Nanotubes Composite as Form-Stable Phase Change Materials for Thermal Energy Storage

Investigation on Microstructure of Potassium Nitrate/Sodium Nitrate Composites for Solar Storage System

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