Latent heat thermal energy storage using cylindrical capsule: Numerical and experimental investigations

Regin, A. Felix; Solanki, S.C.; Saini, J.S.

doi:10.1016/j.renene.2005.10.011

Cited by 156 publications

(28 citation statements)

References 30 publications

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“…Sensible heat storage is used in pebble bed, packed bed or molten salts for thermal solar power plants [3], in water heater storage [4], in blast or glass furnace regenerators [5], and it is the most used technology for heating and cooling of buildings [3]. Latent heat storage is used in buildings for passive storage systems such as phase change material walls, wallboards, and shutters [3], in solar latent heat storage unit [6,7], or for the cooling of transient thermal load of electronic devices [8].…”

Section: Introductionmentioning

confidence: 99%

A thermal energy storage process for large scale electric applications

Desrues¹,

Ruer²,

Marty³

et al. 2010

Applied Thermal Engineering

208

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To cite this version:T Desrues, J Ruer, P Marty, Jf Fourmigué.A thermal energy storage process for large scale electric applications.Applied Thermal Engineering, Elsevier, 2009, 30 (5) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract: A new type of thermal energy storage process for large scale electric applications is presented, based on a high temperature heat pump cycle which transforms electrical energy into thermal energy and stores it inside two large regenerators, followed by a thermal engine cycle which transforms the stored thermal energy back into electrical energy. The storage principle is described, and its thermodynamic cycle is analyzed, leading to the theoretical efficiency of the storage system. A numerical model is developed, and the results show the feasibility of the process, even with sub-optimal parameters. Finally, key factors for improving the process performances are identified. ACCEPTED MANUSCRIPT

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Section: Introductionmentioning

confidence: 99%

A thermal energy storage process for large scale electric applications

Desrues¹,

Ruer²,

Marty³

et al. 2010

Applied Thermal Engineering

208

View full text Add to dashboard Cite

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“…Regin et al [16] show that thermal sensors used to measure the temperature profile will disturb the actual process of melting. Visualization technique was applied to acquire the time of complete melting.…”

Section: Methodsmentioning

confidence: 99%

Theoretical and experimental study of volumetric change rate during phase change process

Qiaoling

Che

2009

Int. J. Energy Res.

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SUMMARYThe solid-to-liquid phase change material can be used to convert the thermal energy of low quality into mechanical energy. Its volumetric change rate has a great effect on the converting efficiency. The mathematical model of the volumetric change rate for the phase change processes of hexadecane within a cylindrical container was presented. A special experimental device was designed and constructed to verify the numerical model. The results at different Stefan numbers of the experiments matched well with those from the numerical simulations. The influences of Stefan number, Biot number and radius of cylinder on the volumetric change rate were studied and analyzed. The results showed that the volumetric change rate depends on the mass fraction of liquid phase and the difference between liquid and solid density of the materials. All the factors affecting the phase change rate will influence the volumetric change rate. The volumetric expansion rate is less than theoretical value under an external pressure. While a high-pressure situation is taken into consideration, the numerical model should also be modified by adding a function calculating density varying with pressure to ensure that the model operates properly. The power output can be enhanced by reducing the total time of melting. It can also be improved when the phase change material is partly melted at a volumetric expansion rate less than 100% of the total value.

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“…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.…”

Section: Pcm Capsulesmentioning

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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Latent heat thermal energy storage using cylindrical capsule: Numerical and experimental investigations

Cited by 156 publications

References 30 publications

A thermal energy storage process for large scale electric applications

A thermal energy storage process for large scale electric applications

Theoretical and experimental study of volumetric change rate during phase change process

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

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