Dynamic Investigation of a Solar-Driven Brayton Cycle with Supercritical CO2

IF 3.8 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Applied System Innovation Pub Date : 2023-08-10 DOI:10.3390/asi6040071
Christos Sammoutos, Angeliki Kitsopoulou, Panagiotis Lykas, Evangelos Bellos, C. Tzivanidis
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Abstract

The exploitation of solar irradiation is a critical weapon for facing the energy crisis and critical environmental problems. One of the most emerging solar technologies is the use of solar towers (or central receiver systems) coupled with high-performance thermodynamic cycles. In this direction, the present investigation examines a solar tower coupled to a closed-loop Brayton cycle which operates with supercritical CO2 (sCO2) as the working medium. The system also includes a storage system with two molten salt tanks for enabling proper thermal storage. The sCO2 is an efficient fluid that presents significant advancements, mainly reduced compression work when it is compressed close to the critical point region. The novelty of the present work is based on the detailed dynamic investigation of the studied configuration for the year period using adjustable time step and its sizing for achieving a continuous operation, something that makes possible the establishment of this renewable technology as a reliable one. The analysis is conducted with a developed model in the Modelica programming language by also using the Dymola solver. According to the simulation results, the yearly solar thermal efficiency is 50.7%, the yearly thermodynamic cycle efficiency is 42.9% and the yearly total system efficiency is 18.0%.
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超临界CO2太阳驱动Brayton循环动力学研究
利用太阳能是应对能源危机和严重环境问题的关键武器。最新兴的太阳能技术之一是使用与高性能热力学循环相结合的太阳能塔(或中央接收器系统)。在这个方向上,本研究考察了一个与闭环布雷顿循环相连的太阳能塔,该循环以超临界CO2(sCO2)为工作介质运行。该系统还包括具有两个熔融盐罐的存储系统,用于实现适当的热存储。sCO2是一种高效的流体,具有显著的进步,主要是在接近临界点区域压缩时减少了压缩功。本工作的新颖性是基于对所研究的配置在一年内的详细动态调查,使用可调节的时间步长及其大小来实现连续运行,这使得这种可再生技术成为可能。通过使用Dymola求解器,使用Modelica编程语言开发的模型进行分析。根据模拟结果,年太阳能热效率为50.7%,年热力循环效率为42.9%,年系统总效率为18.0%。
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来源期刊
Applied System Innovation
Applied System Innovation Mathematics-Applied Mathematics
CiteScore
7.90
自引率
5.30%
发文量
102
审稿时长
11 weeks
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