{"title":"Short-chained ZnO nanostructures intensify heat transfer in d-mannitol based thermal energy storage systems","authors":"","doi":"10.1016/j.icheatmasstransfer.2024.108130","DOIUrl":null,"url":null,"abstract":"<div><div>Nanostructures as additives can enhance the performance of thermal energy storage systems that employ organic phase change materials. A composite (ZnO-Mannitol) containing short-chained zinc oxide nanostructures dispersed in <span>d</span>-Mannitol has been prepared with the concentration of dispersed phase ranging between 0.5 and 5 wt%. The composites were characterized for morphology, dispersed phase-Mannitol interactions and the latent heat of phase transition. The performance of the composites was compared with that of <span>d</span>-Mannitol during the discharge cycle by measuring the overall heat transfer coefficient for latent heat and solid phase sensible heat release under identical test conditions. With the parameters of planetary milling employed for the preparation of composites, those containing ZnO nanostructures at 0.5 wt% and 1 wt% reduced the degree of supercooling by 6.3 °C and 6.5 °C, respectively. The presence of short-chained nanostructures as clustered networks, heterogeneous nucleation and possible elevation in thermal conductivity enhanced the discharge rate for all the compositions of the composites investigated. This work clearly demonstrates 88.4 % and 98 % relative increase in the overall heat transfer coefficient for 1 wt% and 2 wt% ZnO-Mannitol composite, when discharged through a vertical cylindrical surface, in contact with a well-stirred liquid maintained at a constant temperature.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":6.4000,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Communications in Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0735193324008923","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 0
Abstract
Nanostructures as additives can enhance the performance of thermal energy storage systems that employ organic phase change materials. A composite (ZnO-Mannitol) containing short-chained zinc oxide nanostructures dispersed in d-Mannitol has been prepared with the concentration of dispersed phase ranging between 0.5 and 5 wt%. The composites were characterized for morphology, dispersed phase-Mannitol interactions and the latent heat of phase transition. The performance of the composites was compared with that of d-Mannitol during the discharge cycle by measuring the overall heat transfer coefficient for latent heat and solid phase sensible heat release under identical test conditions. With the parameters of planetary milling employed for the preparation of composites, those containing ZnO nanostructures at 0.5 wt% and 1 wt% reduced the degree of supercooling by 6.3 °C and 6.5 °C, respectively. The presence of short-chained nanostructures as clustered networks, heterogeneous nucleation and possible elevation in thermal conductivity enhanced the discharge rate for all the compositions of the composites investigated. This work clearly demonstrates 88.4 % and 98 % relative increase in the overall heat transfer coefficient for 1 wt% and 2 wt% ZnO-Mannitol composite, when discharged through a vertical cylindrical surface, in contact with a well-stirred liquid maintained at a constant temperature.
期刊介绍:
International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.