A numerical investigation on thermal analysis of RPC based solar thermochemical reactor for two-step H2O splitting cycle for hydrogen production

IF 1.1 Q3 Engineering

Journal of Thermal Engineering Pub Date : 2023-05-15 DOI:10.18186/thermal.1297556

Jeet Sharma, R. Jilte, Ravinder Kumar

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引用次数: 1

Abstract

Ceria based solar thermochemical cycle is a high-temperature based redox chemical reactions to split H2O or CO2to produce hydrogen and/or syngas. The redox reactions are carried out in a reactor cavity thus the analysis and optimization of design as well as thermal analysis is a crucial factor to improve the solar-to-fuel conversion efficiency. This paper proposes the hybrid design of cylindrical and hemispherical cavity and its effects of geometrical parame-ters such as reticulated porous ceria (RPC) thickness (15 mm, 20 mm, and 25 mm) and gas flow gap (5 mm&10 mm) on temperature and flux distribution and solar-to-fuel efficiency for both steady-state and transient condition. A numerical computational fluid dynamics (CFD) analysis is carried out to study heat and mass transfer as well as geometrical design consid-eration of the STCR cavity under SolTrace generated Gaussian distributed concentrated solar flux. Two-step water-splitting reaction in the Solar Thermochemical cavity reactor (STCR) using ceria (CeO2) has been modeled to explore the oxygen evolution/reaction rate and to estimate solar-to-fuel efficiency and its relationship with geometrical factors. The RPC of 25 mm thickness yields the highest oxygen evolution rate of 0.34 mL/min/gCeO2 and solar-to-fuel efficiencies are 7.82%, 12.07% and 16.18% for 15 mm, 20 mm and 25 mm of RPC thickness, respectively without heat recovery. The operating conditions and optimized geometric factors, based on result analysis and comparison, are discussed in detail.

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基于RPC的太阳能热化学反应器两步裂解制氢的热分析数值研究

基于铈的太阳能热化学循环是一种基于高温的氧化还原化学反应，用于分解H2O或CO2以产生氢气和/或合成气。氧化还原反应是在反应器腔内进行的，因此设计的分析和优化以及热分析是提高太阳能-燃料转换效率的关键因素。本文提出了圆柱形和半球形空腔的混合设计，以及网格多孔二氧化铈（RPC）厚度（15 mm、20 mm和25 mm）和气流间隙（5 mm和10 mm）等几何参数对稳态和瞬态条件下温度和通量分布以及太阳能-燃料效率的影响。通过数值计算流体动力学（CFD）分析，研究了SolTrace产生的高斯分布集中太阳通量下STCR腔体的传热传质以及几何设计考虑。使用二氧化铈（CeO2）对太阳能热化学腔反应器（STCR）中的两步水分解反应进行了建模，以探索析氧/反应速率，并估计太阳能与燃料的效率及其与几何因素的关系。在没有热回收的情况下，25mm厚度的RPC产生0.34mL/min/gCeO2的最高析氧率，并且对于15mm、20mm和25mm的RPC厚度，太阳能与燃料的效率分别为7.82%、12.07%和16.18%。在分析比较结果的基础上，详细讨论了运行条件和优化几何因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Thermal Engineering THERMODYNAMICS-

CiteScore

2.40

自引率

18.20%

发文量

审稿时长

4 weeks

期刊介绍： Journal of Thermal Enginering is aimed at giving a recognized platform to students, researchers, research scholars, teachers, authors and other professionals in the field of research in Thermal Engineering subjects, to publish their original and current research work to a wide, international audience. In order to achieve this goal, we will have applied for SCI-Expanded Index in 2021 after having an Impact Factor in 2020. The aim of the journal, published on behalf of Yildiz Technical University in Istanbul-Turkey, is to not only include actual, original and applied studies prepared on the sciences of heat transfer and thermodynamics, and contribute to the literature of engineering sciences on the national and international areas but also help the development of Mechanical Engineering. Engineers and academicians from disciplines of Power Plant Engineering, Energy Engineering, Building Services Engineering, HVAC Engineering, Solar Engineering, Wind Engineering, Nanoengineering, surface engineering, thin film technologies, and Computer Aided Engineering will be expected to benefit from this journal’s outputs.