Thermal performance of a water-phase change material solar collector

Kürklü, Ahmet; Özmerzi, Aziz; Bilgin, Sefai

doi:10.1016/s0960-1481(01)00130-6

Cited by 113 publications

(37 citation statements)

References 6 publications

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“…If the shape stabilization is performed with a metallic or a carbon based material, this also leads to an increase of the overall thermal conductivity [27,28]. TES systems based on PCMs find applications in buildings [29,30], hot/cold water storage [31], solar thermal power plants [32], smart thermoregulating textiles [25,33], and thermal management of electronic devices [22]. In most of these applications, the TES function is performed by a dedicated added module, containing PCMs.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional glass fiber/polyamide composites with thermal energy storage/release capability

Fredi¹,

Dorigato²,

Pegoretti³

2018

Express Polym. Lett.

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Abstract. Thermoplastic composite laminates with thermal energy storage (TES) capability were prepared by combining a glass fabric, a polyamide 12 (PA12) matrix and two different phase change materials (PCMs), i.e. a paraffinic wax microencapsulated in melamine-formaldehyde shells and a paraffin shape stabilized with carbon nanotubes. The melt flow index of the PA12/PCM blends decreased with the PCM concentration, especially in the systems with shape stabilized wax. Differential scanning calorimetry showed that, for the matrices with microcapsules, the values of enthalpy were approximately the 70% of the theoretical values, which was attributed to the fracture of some microcapsules. Nevertheless, most of the energy storage capability was preserved. On the other hand, much lower relative enthalpy values were measured on the composites with shape stabilized wax, due to a considerable paraffin leakage or degradation. The subsequent characterization of the glass fabric laminates highlighted that the fiber and void volume fractions were comparable for all the laminates except for that with the higher amount of shape stabilized wax, where the high viscosity of the matrix led to a low fiber volume fraction and higher void content. The mechanical properties of the laminates were only slightly impaired by PCM addition, while a more sensible drop of the elastic modulus, of the stress at break and of the interlaminar shear strength could be observed in the shape stabilized wax systems.

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Section: Introductionmentioning

confidence: 99%

Multifunctional glass fiber/polyamide composites with thermal energy storage/release capability

Fredi¹,

Dorigato²,

Pegoretti³

2018

Express Polym. Lett.

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“…one filled with water and the other one with PCM was investigated by Kürklü et al [24]. Paraffin wax, with a melting and freezing range between 45-50…”

Section: 2mentioning

confidence: 99%

Towards development of a prototype high-temperature latent heat storage unit as an element of a RES-based energy system (part 1)

Bogucka-Bykuć¹,

Włosiński²,

Bykuć³

2014

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. This paper presents briefly the state of the art literature review with respect to research in the field of latent heat storage systems as elements of heat only, power only or combined heat and power (CHP) plants utilizing renewable energy sources (RES) for residential applications. Next, a paper introduces initial research carried out in IMP PAN in Gdańsk, Poland, aimed at development of a prototype latent heat storage unit. Identification of the suggested application for the storage unit in a given system is presented. The first stage of development of a prototype heat storage unit, namely a process of PCM pre-selection is discussed.

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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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Thermal performance of a water-phase change material solar collector

Cited by 113 publications

References 6 publications

Multifunctional glass fiber/polyamide composites with thermal energy storage/release capability

Multifunctional glass fiber/polyamide composites with thermal energy storage/release capability

Towards development of a prototype high-temperature latent heat storage unit as an element of a RES-based energy system (part 1)

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

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