Spectral emittance measurements of micro/nanostructures in energy conversion: a review
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REVIEW ARTICLE
Shiquan SHAN, Chuyang CHEN, Peter G. LOUTZENHISER, Devesh RANJAN, Zhijun ZHOU, Zhuomin M. ZHANG
Spectral emittance measurements of micro/nanostructures in energy conversion: a review
© Higher Education Press 2020
Abstract Micro/nanostructures play a key role in tuning the radiative properties of materials and have been applied to high-temperature energy conversion systems for improved performance. Among the various radiative properties, spectral emittance is of integral importance for the design and analysis of materials that function as radiative absorbers or emitters. This paper presents an overview of the spectral emittance measurement techniques using both the direct and indirect methods. Besides, several micro/nanostructures are also introduced, and a special emphasis is placed on the emissometers developed for characterizing engineered micro/nanostructures in high-temperature applications (e.g., solar energy conversion and thermophotovoltaic devices). In addition, both experimental facilities and measured results for different materials are summarized. Furthermore, future prospects in developing instrumentation and micro/nanostructured surfaces for practical applications are also outlined. This paper provides a comprehensive source of information for the application of micro/nanostructures in high-temperature energy conversion engineering. Keywords concentrating solar power (CSP), emittance measurements, high temperature, micro/nanostructure, Received Mar. 19, 2020; accepted Jun. 8, 2020; online Aug. 30, 2020 Shiquan SHAN State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta GA 30332, USA Chuyang CHEN, Peter G. LOUTZENHISER, Devesh RANJAN,
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Zhuomin M. ZHANG ( ) George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta GA 30332, USA E-mail: [email protected]
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Zhijun ZHOU ( ) State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China E-mail: [email protected]
selective absorber, selective emitter, thermophotovoltaics (TPV)
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Introduction
In recent years, renewed interest in power generation using solar energy has attracted widespread attention as a means to expedite the transition away from fossil fuels while increasing electricity production and mitigating anthropogenic CO2 emissions. Of special interest are two solar technologies for producing electricity as schematically depicted in Fig. 1: the concentrating solar power (CSP) system [1,2], and the thermophotovoltaics (TPV) system [3–5]. CSP is a relatively mature technology for solar energy thermal utilization. Figure 1(a) shows a schematic of a typical solar power tower CSP system consisting of three subsystems: a heliostat field, a molten salt thermal energy storage system, and a thermal power cycle. Direct solar irradiation impinges upon the heliostat mirrors during operation that is redirected to a solar receiver m
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