Microstructured tungsten surfaces as selective emitters

Heinzel, Andreas; Boerner, Volkmar; Gombert, Andreas; Wittwer, V.; Luther, Joachim

doi:10.1063/1.57800

Cited by 13 publications

(7 citation statements)

References 1 publication

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“…Firstly, according to Zhao et al [59] and Heinzel et al [60] both TE and TM polarized waves can excite SPPs in 2D gratings. Under normally incident TM polarized wave, SPPs can be excited along the x direction if the dispersion relation in Eq.…”

Section: Mechanisms Of the Near-perfect Selective Performancementioning

confidence: 99%

A high-Temperature Near-Perfect Solar Selective Absorber Combining Tungsten Nanohole and Nanoshuriken Arrays

Qiu¹,

Xu²,

Li³

et al. 2021

ES Energy Environ.

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Solar selective absorber is a key component that directly influences the photothermal efficiency in high-temperature solar energy harvesting. In present work, a solar selective absorber combining tungsten nanohole and nanoshuriken arrays was proposed and studied. Firstly, the geometry of the absorber was optimized, obtaining a near-perfect absorber. Then, evaluation of the near-perfect absorber indicated that it can achieve near unit spectral absorptance within 0.28-1.25 μm and obtain a solar absorptance of 0.9457, thus achieving a photothermal efficiency of 91.52% at 1273 K under 1000 suns. Then, analysis of its absorbing mechanisms revealed that the high solar absorptance is contributed by the impedance matching, and the coupling effects of the cavity resonance, surface plasmon polaritons, magnetic polaritons, and local surface plasmon resonance. In addition, study on the effects of the geometric parameters indicated that the absorber performance is insensitive to the changes in geometric parameters when the changes are within fabrication uncertainties. Finally, effects of the polarization angle and incident angle were examined, indicating that the near-perfect absorber exhibits high insensitivities to wide-angle incidence and all-angle polarization. These results indicate the near-perfect absorber is promising for high temperature solar energy harvesting.

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Section: Mechanisms Of the Near-perfect Selective Performancementioning

confidence: 99%

A high-Temperature Near-Perfect Solar Selective Absorber Combining Tungsten Nanohole and Nanoshuriken Arrays

Qiu¹,

Xu²,

Li³

et al. 2021

ES Energy Environ.

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“…Numerous investigators have pursued development of hot side TPV spectral control technologies which include: selective, textured, filtered, or photonic crystal radiators [27][28][29][30][31][32][33][34][35][36]. Selective radiators (e.g.…”

Section: Wavelength Selective Radiatorsmentioning

confidence: 99%

Thermophotovoltaic Spectral Control

DePoy¹,

Fourspring²,

Brown³

et al. 2004

2nd International Energy Conversion Engineering Conference

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Spectral control is a key technology for thermophotovoltaic (TPV) direct energy conversion systems because only a fraction (typically less than 25%) of the incident thermal radiation has energy exceeding the diode bandgap energy, E g , and can thus be converted to electricity. The goal for TPV spectral control in most applications is twofold:1. Maximize TPV efficiency by minimizing transfer of low energy, below bandgap photons from the radiator to the TPV diode. 2. Maximize TPV surface power density by maximizing transfer of high energy, above bandgap photons from the radiator to the TPV diode.TPV spectral control options include: front surface filters (e.g. interference filters, plasma filters, interference/plasma tandem filters, and frequency selective surfaces), back surface reflectors, and wavelength selective radiators. System analysis shows that spectral performance dominates diode performance in any practical TPV system, and that low bandgap diodes enable both higher efficiency and power density when spectral control limitations are considered. Lockheed Martin has focused its efforts on front surface tandem filters which have achieved spectral efficiencies of ~83% for E g = 0.52 eV and ~76% for E g = 0.60 eV for a 950 o C radiator temperature.

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“…If the energy flux was given the q r (r, z)| B value is determined on the basis of an assumed initial temperature distribution T (0) (r, z)| B . The resulting q (0) r (r, z)| B is substituted in equation (17) to give a new temperature distribution T (1) (r, z)| B as a solution of equation ( 16). This new T (1) (r, z)| B is then used to find a new q (1) r (r, z)| B and the iteration process is repeated until convergence [12].…”

Section: The Tpv Model-ideas For Realistic Simulationmentioning

confidence: 99%

“…The associated internal quantum efficiency value and the absorption spectrum are taken from [4]. A selective tungsten emitter with a calculated emittance [17] is used as the radiator. The reflector is assumed to be ideal, with a reflectance of R = 1.…”

Section: Example Calculationmentioning

confidence: 99%

Realistic modelling of TPV systems

Aschaber

Hebling

Luther

2003

Semicond. Sci. Technol.

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Realistic modelling of a TPV system is a very demanding task. For a rough estimation of system limits many assumptions simplify the complexity of a thermophotovoltaic converter. It is obvious that real systems cannot be described in this way. An alternative approach that can deal with all these complexities such as arbitrary geometries, participating media, temperature distributions, etc is the Monte Carlo method (MCM). This statistical method simulates radiative energy transfer by tracking the history of a number of photons beginning with the emission by a radiating surface and ending with absorption on a surface or in a medium. All interactions are considered in this way. The disadvantage of large computation time compared to other methods is no longer a weakness with the speed of today's computers. If additional heat transfer modes conduction and/or convection are of similar magnitudes the complexity significantly increases. This paper points out different ways for realistic TPV system simulation focusing on statistical methods. This paper includes an example calculation for a combined radiation-conduction problem and a literature survey.

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Microstructured tungsten surfaces as selective emitters

Cited by 13 publications

References 1 publication

A high-Temperature Near-Perfect Solar Selective Absorber Combining Tungsten Nanohole and Nanoshuriken Arrays

A high-Temperature Near-Perfect Solar Selective Absorber Combining Tungsten Nanohole and Nanoshuriken Arrays

Thermophotovoltaic Spectral Control

Realistic modelling of TPV systems

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