English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The research regarding more efficient renewable energy, including heat recovery is of great importance. Thermophotovoltaic (TPV) converts heat directly into electricity and thus, has great potential for efficient heat recovery. However, at the current stage of research the conversion efficiency of TPV systems is still low and it is uncertain which efficiencies can be achieved. Selective thermal emitters give the opportunity to improve the efficiency of TPV systems if the emission of photons in a certain spectral range matches with a specific TPV cell. Therefore, different dielectric materials and the effects of different design structures are analyzed by calculating the resulting emissivity distributions. The aim is to find a material structure that generates a high emissivity matching the quantum efficiency of the TPV cell. The physical principles of radiation heat transfer, the Maxwell-Garnett-Mie theory and the Effective-Medium theory are implemented into MATLAB to generate a code for calculating the spectral emissivity of different thin films, doped materials and surface gratings. Furthermore, the optical data of suitable materials are implemented in the code to obtain their dielectric functions. The calculation of the spectral emissivity for different design structures shows that materials doped with nanoparticles of reflective metals show a great enhancement of the emissivity in the wavelength range of interest. Developed selective thermal emitter designs of Silicon Carbide or Silicon Dioxide doped with Tungsten nanoparticles and surface gratings of those materials reach emissivity values of up to 0.9 between 0.4 μm and 2 μm.

ANALYSIS OF DIFFERENT SELECTIVE THERMAL EMITTER DESIGNS FOR INCREASING THE EFFICIENCY OF THERMOPHOTOVOLTAIC SYSTEMS