Synthesis and Characterization of Nanoalumina and CNTs-Reinforced Microcapsules with <i>n</i>-Dodecane as a Phase Change Material for Cold Energy Storage

Dong, Beibei; Li, Songlin; Zhang, Xinwen; Wang, Jinghang; Peng, Hao

doi:10.1021/acs.energyfuels.0c01381

Cited by 21 publications

(7 citation statements)

References 43 publications

(62 reference statements)

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“…Microencapsulation methods can generally be divided into physical or chemical methods. At present, the most commonly used methods are spray drying, , sol–gel method, , complex coacervation, , interfacial polymerization, , in situ polymerization, , suspension polymerization, , microemulsion polymerization, − and self-assembly method …”

Section: Methodsmentioning

confidence: 99%

Minireview on Application of Microencapsulated Phase Change Materials with Reversible Chromic Function: Advances and Perspectives

Zhai

Peng

2022

Energy Fuels

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Microencapsulated phase change materials (MEPCMs) have been widely used in the fields of slurry, buildings, and textiles, because of their excellent durability, impermeability, and high thermal conductivity. However, the microencapsulation also makes the phase change process difficult to observe. In recent years, many scholars have attempted to add chromic materials into microcapsules in order to realize the visualization of the phase change process. This paper gives a brief review of extant chromic MECPMs and their applications. Three main types of chromic materials were introduced: thermochromic, photochromic, solvatochromic. Their specific classification and chromic principle are shown. The commonly used preparation method of chromic MEPCMs was presented. The current advance in applications of chromic MEPCMs are briefly discussed. The discussion covers several frontier areas of focus, including thermal control fabric, energy-efficient buildings, wearable temperature sensors, and low-temperature energy storage. A detailed analysis about the application effect and potential of chromic MEPCMs in these areas was given. This Review may provide a guideline for the future study about preparation and application of chromic MEPCMs.

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Section: Methodsmentioning

confidence: 99%

Minireview on Application of Microencapsulated Phase Change Materials with Reversible Chromic Function: Advances and Perspectives

Zhai

Peng

2022

Energy Fuels

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“…The latent heat decreased very little, and the performance of the material was stable after 100 cycles of experiments. Dong et al 107 prepared microcapsules based on C12 and added nanoalumina and CNTs to it. It was found that the addition of nanoparticles greatly increased the TC and reduced the degree of subcooling, but the addition of CNTs reduced the latent heat of the material.…”

Section: Role Of Additives and Comparativementioning

confidence: 99%

Comparative Analysis of Additives for Increasing Thermal Conductivity of Phase Change Materials: A Review

Zhang

et al. 2022

Energy Fuels

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The use of cold storage devices to store energy at low peaks of power usage and release it at peaks is an economic measure. It is also one of the main means to solve the imbalance between electricity shortages during the day and abundance at night. Adding cold storage balls equipped with phase change materials (PCMs) into water cold storage devices can utilize the sensible heat of water and the latent heat of PCMs for cold storage, which has a high energy storage density and can provide cold water with a suitable temperature. PCMs can be divided into organic phase change materials (OPCMs) and inorganic phase change materials (IPCMs), but both have defects. Adding additives or other materials to them to form composite phase change materials (CPCMs) can obtain suitable thermal properties. In the process of material application, some PCMs have problems of poor thermal conductivity (TC) and liquid leakage. The use of additives such as expanded graphite (EG), metal foam, and nanoparticles is a better solution to the above problems. In recent years, many scholars have researched PCMs and additives for increasing thermal conductivity (AITC). However, there is still a lack of detailed comparison among EG, metal foam, and nanoparticles. This article will introduce the PCMs used in the temperature zone (TZ) of cold storage air-conditioning systems (CSASs) and analyze their advantages, disadvantages, and improvement methods. This paper will focus on the latest research on the effect of additives such as nanoparticles, EG, and metal foam on the TC of PCMs. It will also compare the special effects of AITC in preventing supercooling, preventing phase separation, preventing leakage of liquid PCMs, and flame retarding. The future research directions of AITC will be discussed.

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“…Q to =τ over is the instantaneous heat transfer rate, while Q to =ðτ over A cs Þ is the heat flux q av , q av =ðT s À T cs Þ is the equivalent heat transfer coefficient. The equivalent heat transfer coefficient is defined as the cold energy charging coefficient, as shown in Equation (18).…”

Section: Cold Energy Charging Coefficientmentioning

confidence: 99%

“…[16,17] The microscale research object is called a microcapsule. [18,19] 4) The external convective heat transfer coefficient is increased by increasing the flow rate of HTF. [20] These measures strengthen the heat transfer capacity…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Charging Method for Cold Energy Storage Using Foam Freezing

et al. 2021

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Phase change cold energy storage can effectively stabilize the peak value of the power grid, but the cold energy charging rate of phase change material decreases seriously which will reduce the energy efficiency of the system. The cold energy charging performance can be effectively improved by foam freezing, and the foam freezing model is proposed to explore the influence factors and the advantages of this method. Foam freezing is compared with other methods based on the novel concept of cold energy charging coefficient which is carried on the analogy to heat transfer coefficient. It is found that the cold energy charging rate of foam freezing are exponential functions of the height based on e. The foam cold energy charging coefficient is affected by the superposition of convective heat transfer intensity and bubble terminal velocity. The technical path of increasing the cold energy charging coefficient by continuously reducing the bubble size is not feasible. When foam freezing at the radius of 0.6 mm, the cold energy charging coefficient is 237.1 W m−2 K−1, the water equivalent height is 18 mm, and it is the most economical. Foam freezing has advantages over the ice ball and ice‐on‐coil in cold energy charging performance.

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Synthesis and Characterization of Nanoalumina and CNTs-Reinforced Microcapsules with n-Dodecane as a Phase Change Material for Cold Energy Storage

Cited by 21 publications

References 43 publications

Minireview on Application of Microencapsulated Phase Change Materials with Reversible Chromic Function: Advances and Perspectives

Minireview on Application of Microencapsulated Phase Change Materials with Reversible Chromic Function: Advances and Perspectives

Comparative Analysis of Additives for Increasing Thermal Conductivity of Phase Change Materials: A Review

High‐Performance Charging Method for Cold Energy Storage Using Foam Freezing

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