Sodium nitrate – Diatomite composite materials for thermal energy storage

Xu, Guizhi; Leng, Guanghui; Yang, Caiming; Qin, Yue; Wu, Yuting; Chen, Haisheng; Cong, Lin; Ding, Yulong

doi:10.1016/j.solener.2017.03.003

Cited by 97 publications

(28 citation statements)

References 24 publications

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“…Obviously, the thermal conductivity of the fs‐CPCMs was lower than that of the corresponding pure nitrate PCMs, which might be caused by the low thermal conductivity of EVM (usually 0.04–0.08 (W/m K)). Based on previous research, the thermal conductivity of fs‐CPCMs was a reasonable and acceptable level, which allowed relatively fast heat transfer during the melting/solidification process of fs‐CPCMs.…”

Section: Resultsmentioning

confidence: 94%

Expanded Vermiculite: A Promising Natural Encapsulation Material of LiNO₃, NaNO₃, and KNO₃ Phase Change Materials for Medium‐Temperature Thermal Energy Storage

Deng

Nian

2018

Adv Eng Mater

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In the study, with LiNO 3 , NaNO 3 , and KNO 3 as medium-temperature phase change materials (PCMs) and expanded vermiculite (EVM) as the encapsulation material, form-stable composite PCMs (fs-CPCMs) are prepared. The experimental value of maximum encapsulation mass fractions of LiNO 3 -EVM, NaNO 3 -EVM, and KNO 3 -EVM is, respectively, 84.6, 85.7, and 87.0 wt%, which is lower than the theoretical value since the pore structures of EVM are not fully filled by PCMs. SEM results indicate that the PCMs are uniformly distributed and embedded into the pores or on the surfaces of EVM. The excellent chemical compatibility of PCMs with EVM is confirmed by XRD and FT-IR results. DSC tests indicate the phase change temperatures of three fs-CPCMs are between 243.1 and 325.1 C and that latent heats are between 83.1 and 295.4 J g À1 . After 100 melting/solidification cycles, the decrease in latent heats of fs-CPCMs are below 1.91%, exhibiting desirable thermal reliability. The thermal conductivity of LiNO 3 -EVM, NaNO 3 -EVM, and KNO 3 -EVM is, respectively, 0.51, 0.44, and 0.33 W/(m K), indicating acceptable thermal energy charging/discharging rate. TGA analysis reveal that fs-CPCMs show good thermal stability within the designed working temperature range. Therefore, EVM is a promising natural encapsulation material for medium-temperature heat storage.

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Section: Resultsmentioning

confidence: 94%

Expanded Vermiculite: A Promising Natural Encapsulation Material of LiNO₃, NaNO₃, and KNO₃ Phase Change Materials for Medium‐Temperature Thermal Energy Storage

Deng

Nian

2018

Adv Eng Mater

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“…In addition, several studies were conducted for the improvement of thermal conductivity of PCM/diatomite composites by the inclusion of various carbon nanostructures like single-and multi-walled carbon nanotubes [105][106][107][108], graphite [109], graphene oxide [110], reduced graphene oxide [111], and expanded graphite [112]. The summary of the thermal properties of some PCM/MMT composites mentioned in this section is given in Table 4.…”

Section: Diatomite-based Pcm Compositesmentioning

confidence: 99%

Clay Composites for Thermal Energy Storage: A Review

et al. 2020

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The development of novel materials and approaches for effective energy consumption and the employment of renewable energy sources is one of the current trends in modern material science. With this respect, the number of researches is focused on the effective harvesting and storage of solar energy for various applications. Phase change materials (PCMs) are known to be able to store thermal energy of the sunlight due to adsorption and release of latent heat through reversible phase transitions. Therefore, PCMs are promising as functional additives to construction materials and paints for advanced thermoregulation in building and industry. However, bare PCMs have limited practical applications. Organic PCMs like paraffins suffer from material leakage when undergoing in a liquid state while inorganic ones like salt hydrates lack long-term stability after multiple phase transitions. To avoid this, the loading of PCMs in porous matrices are intensively studied along with the thermal properties of the resulted composites. The loading of PCMs in microcontainers of natural porous or layered clay materials appears as a simple and cost-effective method of encapsulation significantly improving the shape and cyclic stability of PCMs. Additionally, the inclusion of functional clay containers into construction materials allows for improving their mechanical and flame-retardant properties. This article summarizes the recent progress in the preparation of composites based on PCM-loaded clay microcontainers along with their future perspectives as functional additives in thermo-regulating materials.

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“…The formation process of composite materials also underwent uniaxial cold compression and high temperature sintering at 900 ℃ for an hour. They used the same method to fabricate NaNO 3 /diatomite composite materials at a sintering temperature of 370 ℃ which held for an hour [11] and NaCl-KCl/diatomite composite materials at a sintering temperature of 680 ℃ which also held for one hour [12]. They stated that the melted PCMs were absorbed into the nanoscale pores of diatomite in the fabrication process to prevent their leakage.…”

Section: Introductionmentioning

confidence: 99%

A novel low-temperature fabrication approach of composite phase change materials for high temperature thermal energy storage

Zhu

Cong

et al. 2019

Applied Energy

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Sodium nitrate – Diatomite composite materials for thermal energy storage

Cited by 97 publications

References 24 publications

Expanded Vermiculite: A Promising Natural Encapsulation Material of LiNO₃, NaNO₃, and KNO₃ Phase Change Materials for Medium‐Temperature Thermal Energy Storage

Expanded Vermiculite: A Promising Natural Encapsulation Material of LiNO₃, NaNO₃, and KNO₃ Phase Change Materials for Medium‐Temperature Thermal Energy Storage

Clay Composites for Thermal Energy Storage: A Review

A novel low-temperature fabrication approach of composite phase change materials for high temperature thermal energy storage

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Sodium nitrate – Diatomite composite materials for thermal energy storage

Cited by 97 publications

References 24 publications

Expanded Vermiculite: A Promising Natural Encapsulation Material of LiNO3, NaNO3, and KNO3 Phase Change Materials for Medium‐Temperature Thermal Energy Storage

Expanded Vermiculite: A Promising Natural Encapsulation Material of LiNO3, NaNO3, and KNO3 Phase Change Materials for Medium‐Temperature Thermal Energy Storage

Clay Composites for Thermal Energy Storage: A Review

A novel low-temperature fabrication approach of composite phase change materials for high temperature thermal energy storage

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Product

Resources

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Expanded Vermiculite: A Promising Natural Encapsulation Material of LiNO₃, NaNO₃, and KNO₃ Phase Change Materials for Medium‐Temperature Thermal Energy Storage

Expanded Vermiculite: A Promising Natural Encapsulation Material of LiNO₃, NaNO₃, and KNO₃ Phase Change Materials for Medium‐Temperature Thermal Energy Storage