Research Papers

Optimal Design of Wavelength Selective Thermal Emitter for Thermophotovoltaic Applications

[+] Author and Article Information
Alok Ghanekar

Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881

Mingdi Sun, Zongqin Zhang

Research and Development Center,
CANATAL Environ Technical Co.,
88 Suyuan Avenue, Jiangning District,
Nanjing 21102, Jiangsu, China

Yi Zheng

Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
e-mail: zheng@uri.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received November 29, 2016; final manuscript received January 12, 2017; published online June 27, 2017. Assoc. Editor: Jingchao Zhang.

J. Thermal Sci. Eng. Appl 10(1), 011004 (Jun 27, 2017) (4 pages) Paper No: TSEA-16-1350; doi: 10.1115/1.4036790 History: Received November 29, 2016; Revised January 12, 2017

We theoretically and numerically demonstrate optimal design of wavelength selective thermal emitter using one-dimensional (1D) and two-dimensional (2D) metal-dielectric gratings for thermophotovoltaic (TPV) applications. Proposed design consists of tungsten (W) and silicon dioxide (SiO2) gratings which can withstand high temperatures. Radiative properties of 1D grating were calculated using a numerical method, while effective medium approximation was used for 2D gratings. Optimal designs were obtained such that output power is maximum for GaSb photovoltaic (PV) cell at emitter temperature of 1500 K and radiated energy for longer wavelengths is limited to a low value. A constrained optimization was performed using genetic algorithm (GA) to arrive at optimal design.

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Grahic Jump Location
Fig. 1

Schematics of proposed designs consisting W/SiO2 gratings on W substrate: (a) a 1D rectangular grating and (b) symmetric 2D grating

Grahic Jump Location
Fig. 2

Emission spectrum of a typical thermal emitter is shown in comparison with EQEof GaSb cell. Spectral heat flux, maximum available heat flux, and power output are calculated at emitter temperature of 1500 K and typical values of VOC and FF.

Grahic Jump Location
Fig. 3

Spectral response of 1D and 2D optimal designs in comparison with EQE of GaSb cell. Emission spectra of suboptimal designs are shown for reference. (1D suboptimal: Λ = 0.5 μm, ϕ = 0.3, and t = 0.5 μm; 1D optimal: Λ = 446 nm, ϕ  = 0.17, and t = 630 nm; 2D suboptimal: Λ = 100 nm, ϕ  = 0.1, and t = 0.5 μm; 2D optimal: ϕ  = 0.71 and t = 95 nm.)



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