Solidification behavior and thermal conductivity of bulk sodium acetate trihydrate composites with thickening agents and graphite

Dannemand, Mark; Furbo, Simon

doi:10.1016/j.solmat.2015.10.038

Cited by 97 publications

(39 citation statements)

References 30 publications

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“…With the continuous cold-thermal cycle, the sediments will continue to increase, resulting in gradually declining of thermal storage capacity. Thus, phase separation is another major problem of salt hydrate PCMs [40].…”

Section: Phase Separation Of Salt Hydratesmentioning

confidence: 99%

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: Phase Separation Of Salt Hydratesmentioning

confidence: 99%

Inorganic Salt Hydrate for Thermal Energy Storage

et al. 2017

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“…Enhancing the thermal [36]. Dannemand et al also suggest adding oil to the PCM chamber to increase heat transfer as the oil could fill in insulating cavities in the solid PCM [15].…”

Section: Heat Transfermentioning

confidence: 99%

Experimental investigations on cylindrical latent heat storage units with sodium acetate trihydrate composites utilizing supercooling

2016

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h i g h l i g h t sThermal energy storage units with supercooled of sodium acetate trihydrate are characterized. Heat exchange capacity rates were lower for units with PCM with thickening agents. Phase separation of sodium acetate trihydrate was avoided by thickening agent. a b s t r a c t Latent heat storage units utilizing stable supercooling of sodium acetate trihydrate (SAT) composites were tested in a laboratory. The stainless steel units were 1.5 m high cylinders with internal heat exchangers of tubes with fins. One unit was tested with 116 kg SAT with 6% extra water. Another unit was tested with 116.3 kg SAT with 0.5% Xanthan rubber as a thickening agent and 4.4% graphite powder. The heat exchange capacity rate during charge was significantly lower for the unit with SAT and Xanthan rubber compared to the unit with SAT and extra water. This was due to less convection in the thickened phase change material after melting. The heat content in the fully charged state and the heat released after solidification of the supercooled SAT mixtures at ambient temperature was higher for the unit with the thickened SAT mixture. The heat discharged after solidification of the supercooled SAT with extra water decreased over repeating charge and discharge cycles while the heat discharged from the SAT with Xanthan rubber remained stable. In both units, the solidification started spontaneously in the majority of the test cycles. This was due to the design of the unit or the method for handling the expansion and contraction of the SAT during charge and discharge.

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“…In addition to the methods listed above, using suitable thickening agent is another possible approach to reduce supercooling degree, especially for salt hydrates. The addition of thickening agent is benefit for preventing incongruent melting, interfering phase segregation,, enhancing lifetime and changing the interaction of molecules . M. Dannemand declared that sodium acetate trihydrate (SAT) containing at least 5% CMC or 1% xanthan rubber and graphite flakes had no supercooling owing to the contraction of composites during solidification caused by the formation of cavities in the central upper part of the samples.…”

Section: Introductionmentioning

confidence: 99%

“…The addition of thickening agent is benefit for preventing incongruent melting, interfering phase segregation,, enhancing lifetime and changing the interaction of molecules . M. Dannemand declared that sodium acetate trihydrate (SAT) containing at least 5% CMC or 1% xanthan rubber and graphite flakes had no supercooling owing to the contraction of composites during solidification caused by the formation of cavities in the central upper part of the samples. H. K. Shin declared that the thermal conductivity of SAT enhanced with increasing of expanded graphite (EG) and CMC concentration, and the thermal conductivity of the composite containing 2.5 wt% EG and 5 wt% CMC is 1.85 W m −1 K −1 .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Erythritol/Graphene Oxide Shape‐Stable Composites with Improved Thermal‐Physical Property

Wang

Zhang

et al. 2019

ChemistrySelect

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In order to improve thermal-physical properties of erythritol (ET), two kinds of shape-stabilized phase change materials (SSPCMs) were fabricated and the effects of graphene oxide (GO), carboxymethyl cellulose (CMC) on supercooling degree and heat release performance of ET were discussed. The results revealed that the encapsulated ET displays excellent shape stability and slightly improved thermal-physical performance, while the capsules containing 0.7 wt% CMC exhibit significant enhancement in thermal-physical properties. The optimal composites, with ET content as high as 97 wt%, melt at 121.9°C with latent heat of 316.8 J g À 1 and freeze at 104.0°C with enthalpy of 295.1 J g À 1 . The heat release percentage increased to 93.2% and the supercooling degree decreased to 17.9°C due to the heterogeneous nucleation of GO and the inhibition of CMC on components separation. Also, the two composites present similar core-shell-like structure, excellent thermal reliability and stability during repeated utilization. In a word, GO can be used as shell to improve thermal conductivity and prevent leakage while CMC can be employed to relax the supercooling degree of ET.

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Solidification behavior and thermal conductivity of bulk sodium acetate trihydrate composites with thickening agents and graphite

Cited by 97 publications

References 30 publications

Inorganic Salt Hydrate for Thermal Energy Storage

Inorganic Salt Hydrate for Thermal Energy Storage

Experimental investigations on cylindrical latent heat storage units with sodium acetate trihydrate composites utilizing supercooling

Preparation and Characterization of Erythritol/Graphene Oxide Shape‐Stable Composites with Improved Thermal‐Physical Property

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