Experimental research on a kind of novel high temperature phase change storage heater

Wang, Xin; Liu, Jing; Zhang, Yinping; Di, Honggui; Jiang, Yi

doi:10.1016/j.enconman.2005.12.004

Cited by 105 publications

(41 citation statements)

References 14 publications

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“…Here, the density q s of the a-Al 2 O 3 shell is 3.98 g/cm 3 [31] and the density q c of the Al-Si alloy core is 2.7 g/cm 3 [11]. Meanwhile, it is considered that the mass proportion between the shell and the core/shell structure can be regarded as a declined percentage of the latent heat, which can be illustrated by:…”

Section: Phase Change Characteristicmentioning

confidence: 99%

“…Traditionally, the methods of corrosion resistant are applied to store Al-Si alloy in a container or protect it by the corrosion layers. For example, Wang [11] developed a kind of novel high-temperature phase change storage heater by storing Al-Si alloy in a clay and ceramic container. Chen [12] researched corrosion behavior of low-pressure plasma-sprayed MoB/CoCr coatings on the stainless steel and summarized that the coatings have excellent durability in the Al-12.07 wt%Si alloy.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of structure and phase change characteristic of microencapsulated core/shell Al–Si alloy microparticles synthesized by two methods

Sui

et al. 2015

J Sol-Gel Sci Technol

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Pre-oxidation process and modification with silane coupling agent (SCA) of original Al-Si alloy particles were selected to synthesize inorganic microencapsulated core/shell Al-Si alloy microparticles based on the sol-gel technology, respectively. The microstructure and phase change characteristic were measured and investigated by means of Fourier transform infrared spectra, X-ray diffraction, scanning electron microscopy, thermogravimetry and differential scanning calorimeter. These two methods can both realize the microencapsulation and form stable dense a-Al 2 O 3 shell. It is speculated that the microencapsulated reason is mainly attributed to the change in surface electric behaviors of Al-Si alloy particles according to the results of zeta potential measure. The latent heats are 416.92 and 307.21 kJ/kg for specimens treated by pre-oxidation and the modification of SCA, respectively. The latter renders thicker and more uniform shell layer. Graphical Abstractalumina gel particles

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Section: Phase Change Characteristicmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of structure and phase change characteristic of microencapsulated core/shell Al–Si alloy microparticles synthesized by two methods

Sui

et al. 2015

J Sol-Gel Sci Technol

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“…[53][54][55][56] Molten salts were the most popular PCMs, and they had a high phase-change point. In addition, several metallic materials have been proposed as PCMs with high phasechange points, 52,66) for applications in solar power generation systems and for the recovery of waste heat at high temperatures over 200°C. Table 2 lists the thermophysical properties of the proposed PCM candidates for high-temperature applications over 100°C.…”

Section: Classification Of Pcmmentioning

confidence: 99%

“…47,58,61,65,66) The tree-like classification diagram shows that single-component materials include organic and inorganic materials; organic PCMs include paraffins and nonparaffins such as fatty acid and sugar alcohol, and inorganic PCMs include hydrates, molten salts, and metal.…”

Section: Required Conditions For Pcmmentioning

confidence: 99%

Technology of Latent Heat Storage for High Temperature Application: A Review

2010

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Table 2. Thermophysical properties of proposed PCM candidates-sugar alcohol, molten salt, and metallicwith phase-changing point over 100°C.from steelworks 2) has more enthalpy at lower temperature but more exergy at a higher temperature over 100°C. Table 3 lists frequently selected keywords from the collected papers. Papers on LHS and PCM frequently used general keywords such as "phase-change material", "PCM", "thermal energy storage", and "latent heat". Apart from these, interestingly, "solar energy" was also frequently used; these papers dealt with PCMs that can store solar energy through melting for various utilities. Keywords such as "phase-change composites", "thermal conductivity", "shape-stabilized" should be noteworthy in that these are related to general problems encountered during the use of PCMs, that is, capsulation and low thermal conductivity. Recent Advancements in LHS Technology PCM CapsulesGenerally, because LHS mainly utilizes the phase change between solid and liquid, the encapsulation of the PCM is necessary to avoid the leakage of a liquid PCM. In addition, Regin et al. 70) noted the functions and requirements of PCM containment: (i) meeting the requirements of strength, flexibility, corrosion resistance, and thermal stability; (ii) acting as a barrier to protect the PCM from harmful interactions with the environment; (iii) providing a sufficient surface for heat transfer, and (iv) providing structural stability and easy handling. PCM capsules are classified into macroand microcapsules.Macrocapsules are the most conventional PCM capsules, and many papers have reported various shell materials such as metal and plastics, and various shapes such as spherical [71][72][73][74][75] and cylindrical. 72,[76][77][78] In contrast, micro-encapsulation of PCM has recently attracted considerable attention [79][80][81][82][83][84][85] because it reduces the reactivity of the PCMs with the outside environment, increases the heat transfer area of the PCMs, and enables the core material to withstand frequent changes in the volume of the storage material during phase change. Table 4 lists trends in manufacturing methods for PCM capsules. Many papers have reported the production of various microcapsules, and the manufacturing methods, core PCM materials, shell materials, thermophysical properties, and capsule sizes of the same have been studied. Micro-interfacial polymerization, 80) in-situ polycondensation, [81][82][83][84][85] and complex coacervation 79) are the most popular microen- ISIJ International, Vol. 50 (2010), No. 9 79,80) 1232© 2010 ISIJ proposed the encapsulation of spherical metal PCMs such as Cu and Pb with an electroplated Ni layer to recover industrial hightemperature waste heat such as combustion offgas. The PCM spherical capsule with Ni coverage provided hybrid functions of both heat storage and catalysis. Nickel worked well as a catalyst of the gas phase reaction CH 4 ϩH 2 Oϭ 3H 2 ϩCO at 1000°C.In summary, the encapsulation of low-temperature PCMs is a state-of-the-art technology; in p...

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“…Data can be obtained from literature for elements and well known compounds, but are not always readily available or consistent for new PCMs under consideration. Differential scanning calorimetry (DSC), which is typically used to determine phase transformations and associated energies (glass transition temperature, melting temperature, heat 575 [9] 560 [9] 180/70 [10] Metal alloyA l 12Si 5Mg 560 [11] 545 [11] 200/70 [11] Al 33Cu 548 [11] 351 [11] 130/80 [11] NaNO 3 306 [8] 172 [8] 0.6 [8] Salts NaCl 800 [8] 492 [8] 5 [8] Na 2 CO 3 854 [8] 275.7 [8] 2 [8] HTF energy storage research in switzerland -the sccer heat & electricity storage same temperature boundary conditions as in Fig. 2 were used and a heat transfer coefficient of 300 W/m 2 /K between surrounding air and cylinder was assumed.…”

Section: Phase Change Materials (Pcm)mentioning

confidence: 99%

Phase Change Material Systems for High Temperature Heat Storage

Perraudin

Binder

Rezaei

et al. 2015

Chimia

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Efficient, cost effective, and stable high-temperature heat storage material systems are important in applications such as high-temperature industrial processes (metal processing, cement and glass manufacturing, etc.), or electricity storage using advanced adiabatic compressed air energy storage. Incorporating phase change media into heat storage systems provides an advantage of storing and releasing heat at nearly constant temperature, allowing steady and optimized operation of the downstream processes. The choice of, and compatibility of materials and encapsulation for the phase change section is crucial, as these must guarantee good and stable performance and long lifetime at low cost. Detailed knowledge of the material properties and stability, and the coupled heat transfer, phase change, and fluid flow are required to allow for performance and lifetime predictions. We present coupled experimental-numerical techniques allowing prediction of the long-term performance of a phase change material-based high-temperature heat storage system. The experimental investigations focus on determination of material properties (melting temperature, heat of fusion, etc.) and phase change material and encapsulation interaction (stability, interface reactions, etc.). The computational investigations focus on an understanding of the multi-mode heat transfer, fluid flow, and phase change processes in order to design the material system for enhanced performance. The importance of both the experimental and numerical approaches is highlighted and we give an example of how both approaches can be complementarily used for the investigation of long-term performance.

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Experimental research on a kind of novel high temperature phase change storage heater

Cited by 105 publications

References 14 publications

Comparison of structure and phase change characteristic of microencapsulated core/shell Al–Si alloy microparticles synthesized by two methods

Comparison of structure and phase change characteristic of microencapsulated core/shell Al–Si alloy microparticles synthesized by two methods

Technology of Latent Heat Storage for High Temperature Application: A Review

Phase Change Material Systems for High Temperature Heat Storage

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