Study on sodium acetate trihydrate-expand graphite-carbon nanotubes composite phase change materials with enhanced thermal conductivity for waste heat recovery

Sun, Wanchun; Liang, Guohao; Feng, Fenglan; He, Hong‐Ping; Gao, Zhiming

doi:10.1016/j.est.2022.105857

Cited by 20 publications

(4 citation statements)

References 28 publications

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“…During the phase change process of PCMs, the nucleating agent remained in a solid state. These particles acted as crystal nucleus and provided nucleation sites, helping to promote the formation and growth of more crystal nucleus, thereby reducing the supercooling degree of PCMs [32,43,44]. When the content of nucleating agent was insufficient, it could not provide sufficient driving force and surface area to promote nucleation.…”

Section: Pore Structure Analysis and Particle Size Distributionmentioning

confidence: 99%

“…However, inorganic hydrated salts suffer from phase instability, supercooling, issue of corrosion and vaporization, and low optical absorbance [29][30][31]. Especially the problems of phase instability and supercooling can affect the thermal properties of PCMs, but these issues can be resolved through appropriate methods [32][33][34][35]. The inorganic hydrated salt PCM is composed of inorganic salts and water molecules.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Performance of Inorganic Hydrated Salt-Based Composite Materials for Temperature and Humidity Regulation

Ye,

Wang,

et al. 2024

International Journal of Energy Research

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In this work, it was first proposed to combine hydrated salt phase change materials (PCMs) with humidity control materials to prepare the temperature and humidity control material. The composite PCM was prepared by absorbing Na2HPO4·12H2O with colloidal silicon dioxide, and diatomite was selected as the humidity control material. The humidity performance tests found that diatomite had good moisture absorption/desorption capacity and excellent moisture buffering capacity. The supercooling degree tests showed that Na2SiO3·9H2O as nucleating agent effectively reduced the supercooling degree, and the addition of deionized water improved the water loss problem of composite PCMs. The DSC tests showed that the enthalpy and melting temperature of composite PCMs were 153.1 J/g and 28.9°C, respectively. By placing the temperature and humidity control material in different humidity, it was found that the moisture content of diatomite affected the thermal properties of composite PCMs. Diatomite could not only transfer moisture to hydrated salts but also absorb moisture from hydrated salt. The application performance tests of the temperature and humidity control material in the room model showed that it could simultaneously regulate indoor temperature and humidity. Overall, this temperature and humidity control material was more suitable for environments with high relative humidity such as greenhouses.

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Section: Pore Structure Analysis and Particle Size Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of Inorganic Hydrated Salt-Based Composite Materials for Temperature and Humidity Regulation

Ye,

Wang,

et al. 2024

International Journal of Energy Research

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“…In an SAT composite, Sun et al [82] reported that the addition of 4 wt% of urea could inhibit phase segregation, and 4 wt% of disodium hydrogen phosphate dodecahydrate (Na 2 HPO 4 •12H 2 O, DHPD) nucleation agents could reduce the supercooling degree to 0.6 • C. To improve thermal conductivity and prevent leakage, they compounded the PCMs with mixed EG and CNTs. Interestingly, they found that the addition of 2 wt% of CNTs could further increase the thermal conductivity of the composites from 6.141 W/(m•K) to 7.178 W/(m•K) because they filled the gaps between the hydrated salts and the pores of the EG.…”

Section: Hydrated Salt-cnt Compositesmentioning

confidence: 99%

Carbon-Enhanced Hydrated Salt Phase Change Materials for Thermal Management Applications

Liu,

Li,

et al. 2024

Nanomaterials

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Inorganic hydrated salt phase change materials (PCMs) hold promise for improving the energy conversion efficiency of thermal systems and facilitating the exploration of renewable thermal energy. Hydrated salts, however, often suffer from low thermal conductivity, supercooling, phase separation, leakage and poor solar absorptance. In recent years, compounding hydrated salts with functional carbon materials has emerged as a promising way to overcome these shortcomings and meet the application demands. This work reviews the recent progress in preparing carbon-enhanced hydrated salt phase change composites for thermal management applications. The intrinsic properties of hydrated salts and their shortcomings are firstly introduced. Then, the advantages of various carbon materials and general approaches for preparing carbon-enhanced hydrated salt PCM composites are briefly described. By introducing representative PCM composites loaded with carbon nanotubes, carbon fibers, graphene oxide, graphene, expanded graphite, biochar, activated carbon and multifunctional carbon, the ways that one-dimensional, two-dimensional, three-dimensional and hybrid carbon materials enhance the comprehensive thermophysical properties of hydrated salts and affect their phase change behavior is systematically discussed. Through analyzing the enhancement effects of different carbon fillers, the rationale for achieving the optimal performance of the PCM composites, including both thermal conductivity and phase change stability, is summarized. Regarding the applications of carbon-enhanced hydrate salt composites, their use for the thermal management of electronic devices, buildings and the human body is highlighted. Finally, research challenges for further improving the overall thermophysical properties of carbon-enhanced hydrated salt PCMs and pushing towards practical applications and potential research directions are discussed. It is expected that this timely review could provide valuable guidelines for the further development of carbon-enhanced hydrated salt composites and stimulate concerted research efforts from diverse communities to promote the widespread applications of high-performance PCM composites.

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“…A typical detached house was modelled according to Chilean building codes, and an energy assessment was conducted via dynamic calculations, with environmental impact determined using the ReCiPe methodology. Jin et al [31] and Sun et al [32] investigated the heat transfer mechanisms of both distributed and coupled PCM systems to provide an in-depth understanding and presented solutions for system performance enhancement of novel PCM-based systems. The authors also presented a systematic overview of novel PCM-based strategies for thermal performance enhancement, together with the technical challenges of widespread applications.…”

Section: Temperaturementioning

confidence: 99%

A Novel Molecular PCM Wall with Inorganic Composite: Dynamic Thermal Analysis and Optimization in Charge–Discharge Cycles

Yang,

Xiong,

Mao

et al. 2023

Materials

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The combination of electric heating and thermal energy storage (TES) with phase change material (PCM) can achieve load shifting for air conditioning energy saving in building sectors. Their non-flammability, relatively good mechanical properties, and low cost make inorganic PCMs attractive in construction engineering. However, PCMs often show poor thermal conductivity, low heat transfer efficiency, leakage risk, etc., in applications. Moreover, the practical thermal performance of PCM–TES sometimes fails to meet demand variations during charge and discharge cycles. Therefore, in this study, a novel integrated electric PCM wall panel module is proposed with quick dynamic thermal response in space heating suitable for both retrofitting of existing buildings and new construction. Sodium–urea PCM composites are chosen as PCM wall components for energy storage. Based on the enthalpy–porosity method, a mathematical heat transfer model is established, and numerical simulation studies on the charge–discharge characteristics of the module are conducted using ANSYS software. Preliminary results show that the melting temperature decreases from 50 °C to approximately 30 °C with a 30% urea mixing ratio, approaching the desired indoor thermal comfort zone for space heating. With declining PCM layer thickness, the melting time drops, and released heat capacity rises during the charge process. For a 20 mm thick PCM layer, 150 W/m2 can maintain the average surface temperature within a comfort range for 12.1 h, about half the time of a 24 h charge–discharge cycling periodicity. Furthermore, placing the heating film in the unit center is preferable for improving overall heat efficiency and shortening the time to reach the thermal comfort temperature range. This work can provide guidance for practical thermal design optimization of building envelopes integrated with PCM for thermal insulation and energy storage.

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Study on sodium acetate trihydrate-expand graphite-carbon nanotubes composite phase change materials with enhanced thermal conductivity for waste heat recovery

Cited by 20 publications

References 28 publications

Preparation and Performance of Inorganic Hydrated Salt-Based Composite Materials for Temperature and Humidity Regulation

Preparation and Performance of Inorganic Hydrated Salt-Based Composite Materials for Temperature and Humidity Regulation

Carbon-Enhanced Hydrated Salt Phase Change Materials for Thermal Management Applications

A Novel Molecular PCM Wall with Inorganic Composite: Dynamic Thermal Analysis and Optimization in Charge–Discharge Cycles

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