Thermal storage achievement of paraffin wax phase change material systems with regard to novolac aerogel/carbon monofilament/zinc borate form stabilization

被引:20
作者
Nazari, Narges [1 ]
Bahramian, Ahmad Reza [1 ]
Allahbakhsh, Ahmad [2 ]
机构
[1] Tarbiat Modares Univ, Fac Chem Engn, Polymer Engn Dept, POB 14115-143, Tehran, Iran
[2] Hakim Sabzevari Univ, Fac Engn, Dept Mat & Polymer Engn, Sabzevar, Iran
关键词
Phase change composite; Nanocomposite aerogel; Paraffin wax; Carbon monofilaments; Zinc borate; CHANGE COMPOSITES; MECHANICAL PROPERTY; SOL CONCENTRATION; CARBON AEROGELS; MORPHOLOGY; MICROSTRUCTURE; STABILITY;
D O I
10.1016/j.est.2022.104741
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Recently, the development of thermal conductive phase change composites (PCCs) to overcome the limitation of low thermal conductivity and easy leakage of organic phase change materials (PCMs) has led to the wide application of these materials. In this study, a novolac aerogel-based composite was employed as porous support for the encapsulation of paraffin to fabricate a new class of high-performance PCCs. Carbon monofilaments and zinc borate were incorporated into the aerogel as the heat conduction network. Furthermore, zinc borate can act as a flame retardant and nucleation agent. The nanocomposite aerogels were synthesized using the sol-gel technique and then the molten paraffin was impregnated into systems. The structure and thermal properties of the nanocomposite aerogels and PCCs were characterized. Fortunately, no shrinkage was observed during aerogel synthesis. SEM images showed the formation of novolac colloids on the surface of carbon fiber. The presence of conductive fillers results in an enhancement of the thermal conductivity of novolac aerogel. More-over, the thermal conductivity of fabricated aerogels was predicted using a modified series-parallel model for porous composite structures. Furthermore, more porosity and larger pore size of aerogels by incorporation of filler have led to a significant increase in paraffin absorption capacity. So that the highest impregnation was reached to 364.5 wt% that belongs to AC15Z15 sample. The form-stable PCMs had negligible paraffin leakage upon phase change process (less than 1.4 wt%). In addition, the leakage of PCMs composite was less than 2.59 wt % after heating for 10 h showed outstanding cycle stability of synthesized PCCs. The phase transition temper-ature and phase change enthalpy of PCCs were in the range of 85-96 C and 33.94-41.85 J/g, respectively. Moreover, the latent heat of PCCs is in the range of pure paraffin, achieving high energy storage capacity. This type of PCMs system in nanostructure can be used in electrical industry for free cooling of electrical coils in this temperature range.
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页数:10
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共 47 条
[1]   Synthesis and characterization of carbon fiber/silica aerogel nanocomposites [J].
Agnieszka, Slosarczyk ;
Wojciech, Strauchmann ;
Piotr, Ziolkowski ;
Paulina, Jakubowska .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 2015, 416 :1-3
[2]   Laponite/multigraphene hybrid-reinforced poly(vinyl alcohol) aerogels [J].
Alhwaige, Almahdi A. ;
Herbert, Matthew M. ;
Alhassan, Saeed M. ;
Ishida, Hatsuo ;
Qutubuddin, Syed ;
Schiraldi, David A. .
POLYMER, 2016, 91 :180-186
[3]   Graphene-based phase change composites for energy harvesting and storage: State of the art and future prospects [J].
Allahbakhsh, Ahmad ;
Arjmand, Mohammad .
CARBON, 2019, 148 :441-480
[4]   Self-assembly of graphene quantum dots into hydrogels and cryogels: Dynamic light scattering, UV-Vis spectroscopy and structural investigations [J].
Allahbakhsh, Ahmad ;
Bahramian, Ahmad Reza .
JOURNAL OF MOLECULAR LIQUIDS, 2018, 265 :172-180
[5]   Novolac-derived carbon aerogels pyrolyzed at high temperatures: experimental and theoretical studies [J].
Allahbakhsh, Ahmad ;
Bahramian, Ahmad Reza .
RSC ADVANCES, 2016, 6 (76) :72777-72790
[6]   Influences of sodium dodecyl sulfate on vulcanization kinetics and mechanical performance of EPDM/graphene oxide nanocomposites [J].
Allahbakhsh, Ahmad ;
Mazinani, Saeedeh .
RSC ADVANCES, 2015, 5 (58) :46694-46704
[7]   THE INFLUENCE OF OXYGEN-CONTAINING FUNCTIONAL GROUPS ON THE SURFACE BEHAVIOR AND ROUGHNESS CHARACTERISTICS OF GRAPHENE OXIDE [J].
Allahbakhsh, Ahmad ;
Sharif, Farhad ;
Mazinani, Saeedeh .
NANO, 2013, 8 (04)
[8]   Preparation of Boron Nitride-Coated Carbon Fibers and Synergistic Improvement of Thermal Conductivity in Their Polypropylene-Matrix Composites [J].
Badakhsh, Arash ;
Han, Woong ;
Jung, Sang-Chul ;
An, Kay-Hyeok ;
Kim, Byung-Joo .
POLYMERS, 2019, 11 (12)
[9]   Pyrolysis and flammability properties of novolac/graphite nanocomposites [J].
Bahramian, Ahmad Reza .
FIRE SAFETY JOURNAL, 2013, 61 :265-273
[10]   Allotrope carbon materials in thermal interface materials and fuel cell applications: A review [J].
Bahru, Raihana ;
Shaari, Norazuwana ;
Mohamed, Mohd Ambri .
INTERNATIONAL JOURNAL OF ENERGY RESEARCH, 2020, 44 (04) :2471-2498