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Comparison of direct numerical simulation with volume-averaged method on composite phase change materials for thermal energy storage
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China; School of Sustainable Development of Society and Technology, Mälardalen University, 721 23 Västerås, Sweden.
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2018 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 229, p. 700-714Article in journal (Refereed) Published
Abstract [en]

Melting heat transfer in open-cell metal foams embedded in phase-change materials (PCMS) predicted by the volume-averaged method (VAM) was systematically compared with that calculated using direct numerical simulation (DNS), with particular attention placed upon the contribution of natural convection in the melt region to overall phase change heat transfer. The two-temperature model based on the assumption of local thermal non-equilibrium was employed to account for the large difference of thermal conductivity between metallic ligaments and PCM (paraffin). The Forchheimer extended Darcy model was employed to describe the additional flow resistance induced by metal foam. For the DNS, a geometric model of metal foam based on tetrakaidehedron cells was reconstructed. The DNS results demonstrated significant temperature difference between ligament surface and PCM, thus confirming the feasibility of local thermal non-equilibrium employed in VAM simulations. Relative to the DNS results, the VAM combined with the two-temperature model could satisfactorily predict transient solid-liquid interface evolution and local temperature distribution, although pore-scale features of phase change were lost. The presence of natural convection affected significantly the melting front shape, temperature distribution and full melting. The contribution of natural convection to overall phase change heat transfer should be qualitatively and quantitatively given sufficient consideration from both macroscopic (VAM) and microscopic (DNS) point of views. Besides, practical significance and economic prospective using metal foam in TES unit for WHR system to provide residential heating or hot water is discussed and analyzed.

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 229, p. 700-714
Keywords [en]
Direct numerical simulation, Natural convection, Open-cell metal foam, Phase change, Volume averaged method, Flow of fluids, Heat storage, Melting, Metal foams, Metals, Numerical methods, Numerical models, Phase interfaces, Temperature distribution, Thermal conductivity, Composite phase change materials, Local thermal non-equilibrium, Open-cell metal foams, Phase change heat transfer, Solid-liquid interfaces, Temperature differences, Phase change materials, comparative study, composite, energy storage, heat transfer, heating, numerical method, simulation, thermal power
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236600DOI: 10.1016/j.apenergy.2018.08.012ISI: 000449891500054Scopus ID: 2-s2.0-85051406435OAI: oai:DiVA.org:kth-236600DiVA, id: diva2:1265741
Note

Export Date: 22 October 2018; Article; CODEN: APEND; Correspondence Address: Jin, L.; Institute of the Building Environment & Sustainability Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong UniversityChina; email: lwjin@xjtu.edu.cn; Funding details: xjj2016042; Funding details: TC-2016A-092; Funding details: 2016T90916, Aeronautical Science Foundation of China; Funding details: 2015M580845, Aeronautical Science Foundation of China; Funding details: NR2016K01; Funding details: CSC, China Scholarship Council; Funding details: KTH, Kungliga Tekniska Högskolan; Funding details: 2016BSHYDZZ54, Natural Science Foundation of Shaanxi Province; Funding details: 51506160, NSFC, National Natural Science Foundation of China; Funding text: This work was supported by the National Natural Science Foundation of China ( 51506160 ), China Post-doctoral Science Foundation Funded Project ( 2015M580845 , 2016T90916 ), Shaanxi Province Post-Doctoral Science Foundation Project ( 2016BSHYDZZ54 ), China Northwest Architecture Design and Research Institute CO. Ltd ( TC-2016A-092 ), the fundamental research funds for central universities (xjj2016042) and the Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering ( NR2016K01 ). Xiaohu Yang is financially supported by China Scholarship Council (CSC) to conduct research in Royal Institute of Technology (KTH) and Mälardalen University (MDH), Sweden. QC 20181126

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-12-07Bibliographically approved

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