Thermal Performance Testing of a Solar Water Heating System Using Core-Shell Structured Nanofluids

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Nanoscale and Microscale Thermophysical Engineering Pub Date : 2022-10-02 DOI:10.1080/15567265.2022.2146025

İbrahim Atmaca, Osman Samet Özdemir, A. Çağlar, Sezgi Koçak Soylu, M. Asiltürk

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引用次数: 1

Abstract

ABSTRACT This study investigates the impact of core-shell based nanofluids on the thermal performance of a solar water heating system by studying the changes in the useful heat gain and collector efficiency. This work would be the first to report the use of core-shell nanoparticles in solar water heating systems. The core-shell structure allows for dual improvements in thermal conductivity and better nanofluid stability, even without a surfactant. Therefore, three novel nanofluids were prepared by adding 2 wt% TiO2@SiO2, Fe3O4@SiO2, and ZnO@SiO2 core-shell nanoparticles to pure water to be used in the experiments. The experimental thermal performances of the nanofluids were individually compared with pure water by the simultaneous operation of two identical systems. The results showed that the nanofluids with Fe3O4@SiO2 and ZnO@SiO2 particles had better performance than the base fluid. In particular, 16.65% and 5.40% increase in the useful energy gain and a 17.12% and 7.39% increase in the collector efficiency were observed with Fe3O4@SiO2 and ZnO@SiO2 core-shell based nanofluids, respectively. It is possible to conclude that, with their improved performance, the Fe3O4@SiO2-based nanofluids have great potential to be used in solar hot water systems instead of water.

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核壳结构纳米流体太阳能热水系统的热性能测试

摘要本研究通过研究有效热增益和收集器效率的变化，研究了核壳基纳米流体对太阳能热水系统热性能的影响。这项工作将是第一次报道核壳纳米颗粒在太阳能热水系统中的应用。核壳结构允许热导率的双重提高和更好的纳米流体稳定性，即使没有表面活性剂。因此，通过添加2wt%，制备了三种新型纳米流体TiO2@SiO2，Fe3O4@SiO2和ZnO@SiO2核-壳纳米颗粒到纯水中，以在实验中使用。通过同时操作两个相同的系统，分别将纳米流体的实验热性能与纯水进行了比较。结果表明，具有Fe3O4@SiO2和ZnO@SiO2颗粒具有比基础流体更好的性能。特别是，观察到有用能量增益分别增加了16.65%和5.40%，收集器效率分别增加了17.12%和7.39%Fe3O4@SiO2和ZnO@SiO2基于核壳的纳米流体。可以得出这样的结论：随着性能的提高Fe3O4@SiO2-based纳米流体在太阳能热水系统中代替水具有巨大的应用潜力。

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来源期刊

Nanoscale and Microscale Thermophysical Engineering 工程技术-材料科学：表征与测试

CiteScore

5.90

自引率

2.40%

发文量

审稿时长

3.3 months

期刊介绍： Nanoscale and Microscale Thermophysical Engineering is a journal covering the basic science and engineering of nanoscale and microscale energy and mass transport, conversion, and storage processes. In addition, the journal addresses the uses of these principles for device and system applications in the fields of energy, environment, information, medicine, and transportation. The journal publishes both original research articles and reviews of historical accounts, latest progresses, and future directions in this rapidly advancing field. Papers deal with such topics as: transport and interactions of electrons, phonons, photons, and spins in solids, interfacial energy transport and phase change processes, microscale and nanoscale fluid and mass transport and chemical reaction, molecular-level energy transport, storage, conversion, reaction, and phase transition, near field thermal radiation and plasmonic effects, ultrafast and high spatial resolution measurements, multi length and time scale modeling and computations, processing of nanostructured materials, including composites, micro and nanoscale manufacturing, energy conversion and storage devices and systems, thermal management devices and systems, microfluidic and nanofluidic devices and systems, molecular analysis devices and systems.