Elaboration of Conductive Thermal Storage Composites Made of Phase Change Materials and Graphite for Solar Plant

Pincemin, Sandrine; Py, Xavier; Olivès, Régis; Christ, Martin; Oettinger, O.

doi:10.1115/1.2804620

Cited by 56 publications

(44 citation statements)

References 6 publications

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“…Different approaches have been proposed to overcome this problem: use of metal thin strips (Hoogendoorn and Bart, 1992), thin walled rings (Velraj et al 1999), porous metals (Weaver and Viskanta, 1986) porous graphite (Tayeb, 1996), metal foam matrix (Calmidi and Mahajan, 1999) and carbon fibers (Fukai et al 2000 and are among the common techniques used to enhance the effective thermal conductivity of PCMs. The presence of the nanoparticles in the PCM increases significantly the effective thermal conductivity of the fluid and consequently enhances the heat transfer characteristics (Cabeza et al , 2002;Mettawee, and Assassa, 2007;Khodadadi, and Hosseinizadeh, 2007;Zeng et al 2007;Pincemin et al, 2008;Kim and Drzal, 2009;Ho and Gao, 2009). …”

Section: Introductionmentioning

confidence: 99%

THERMAL PERFORMANCE ENHANCEMENT OF PARAFFIN WAX WITH AL2O3 AND CuO NANOPARTICLES – A NUMERICAL STUDY

Amirtham¹,

Sasmito²,

Mujumdar³

2012

Frontiers in Heat and Mass Transfer

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The heat transfer enhancement of paraffin wax, a cheap and widely used latent heat thermal energy storage material, using nanoparticles is investigated. The effects of nanoparticle volume fraction on both the melting and solidification rates of paraffin wax are analysed and compared for Al 2 O 3 and CuO nanoparticles. Present results show that dispersing nanoparticles in smaller volumetric fractions increase the heat transfer rate. The enhancement in thermal performance of paraffin wax is greater for Al 2 O 3 compared with that for CuO nanoparticles. .

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Section: Introductionmentioning

confidence: 99%

THERMAL PERFORMANCE ENHANCEMENT OF PARAFFIN WAX WITH AL2O3 AND CuO NANOPARTICLES – A NUMERICAL STUDY

Amirtham¹,

Sasmito²,

Mujumdar³

2012

Frontiers in Heat and Mass Transfer

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“…LHS has been widely applied in building materials, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] free cooling, [19][20][21][22] electronics cooling, [23][24][25][26][27][28][29][30][31][32][33][34] solar water heating, [35][36][37][38][39][40][41][42] solar power generation, [43][44][45][46][47][48][49] and waste heat utilization. [50][51][52][53][54]…”

Section: Technology Of Latent Heat Storage For High Temperature Applimentioning

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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“…as PCM and expanded graphite by Pincemin, et al [45] and Steinmann, et al [49]. Pincemin et al [43] result showed that a composite with 20% ENG has a radial thermal conductivity of 40 W/mK and 22 W/mK at 47 o C and 200 o C respectively.…”

Section: Composite Materials (Micro Encapsulation)mentioning

confidence: 99%

“…• Cold compression involves compressing a mixture of the solid PCM with the high thermal conductivity material powder at ambient temperature to form a solid composite. This method do not require thermal energy during production and there is no corrosion of equipment [45].…”

Section: Composite Materials (Micro Encapsulation)mentioning

confidence: 99%

“…Pincemin et al [45] used the infiltration method for the production of a NaNO3/KNO3-ENG (Expanded Natural Graphite) composite by soaking of the graphite matrix in the melted PCM under atmospheric and vacuum conditions, at industrial and lab scale. After 15 hours of soaking, ~40% by volume of the graphite pores is empty.…”

Section: Composite Materials (Micro Encapsulation)mentioning

confidence: 99%

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Review of PCMS and heat transfer enhancement methods applied in parabolic trough solar plants thermal storage systems

Muhammad¹

2018

Nig. J. Tech.

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Solar thermal power generation requires a cost effective thermal storage system. The existing two tank system is very expensive due to the storage material inventory. The use of phase change materials (PCMs) offers higher storage density. A review of potential PCMs was conducted in order to come up with commercially available ones having suitable properties. Most available PCMs have low thermal conductivity making heat transfer enhancement necessary for power applications. The various methods of heat transfer enhancement in latent heat storage systems were also reviewed systematically. The review showed that three commercially-available PCMs are suitable in the operating temperature range of parabolic trough plants. Many heat transfer enhancement methods have been investigated in the literature but the use of aluminium fins is the most promising in the temperature range of 250-330 o C. Many eutectic mixtures of materials have potential for use but discrepancies exist in their reported melting temperature and latent heat of fusion.Keywords: Latent heat, high temperature, thermal conductivity enhancement 1. INTRODUCTION Solar thermal power generation is one the most sustainable and renewable source of electricity. It has the potential of fulfilling the world's electricity needs due to the availability of solar energy in sufficient quantity in various regions of the world [1 -3]. Various solar thermal technologies have been developed over the years for the generation of electricity [4]. The parabolic dish [5 -7] power tower [8,9] and the parabolic trough [10 -12] are the most advanced and have been commercialized. The parabolic trough technology using synthetic oil as the heat transfer fluid (HTF) with operating temperature range between 290 and 400 o C is the most matured and cost effective technology for capacities <200 MW. This can partly be attributed to the experience gained in the operation and maintenance of the 354 MW Solar Electric Generating Station (SEGS) plants for over two (2) decades [4,13]. Most commercial solar plants in operation and under construction are of the parabolic trough technology [9]. The stable and sustainable operation of a solar thermal plant requires a back-up thermal energy source in order to produce thermal energy when that from the sun is insufficient. For cost effective operation there is also the need to avoid energy wastage when the

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Elaboration of Conductive Thermal Storage Composites Made of Phase Change Materials and Graphite for Solar Plant

Cited by 56 publications

References 6 publications

THERMAL PERFORMANCE ENHANCEMENT OF PARAFFIN WAX WITH AL2O3 AND CuO NANOPARTICLES – A NUMERICAL STUDY

THERMAL PERFORMANCE ENHANCEMENT OF PARAFFIN WAX WITH AL2O3 AND CuO NANOPARTICLES – A NUMERICAL STUDY

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

Review of PCMS and heat transfer enhancement methods applied in parabolic trough solar plants thermal storage systems

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