TPV efficiency predictions and measurements for a closed cavity geometry

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A thermophotovoltaic (TPV) efficiency measurement, within a closed cavity, is an integrated test which incorporates four fundamental parameters of TPV direct energy conversion. These are: (1) the TPV devices, (2) spectral control, (3) a radiation/photon source, and (4) closed cavity geometry affects. The overall efficiency of the TPV device is controlled by the TPV cell performance, the spectral control characteristics, the radiator temperature and the geometric arrangement. Controlled efficiency measurements and predictions provide valuable feedback on all four. This paper describes and compares two computer codes developed to model 16, 1 cm{sup 2} TPV cells (in a 4x4 configuration) in ... continued below

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17 p.

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Gethers, C.K.; Ballinger, C.T.; Postlethwait, M.A.; DePoy, D.M. & Baldasaro, P.F. May 1, 1997.

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  • Knolls Atomic Power Laboratory
    Publisher Info: Knolls Atomic Power Lab., Schenectady, NY (United States)
    Place of Publication: Schenectady, New York

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Description

A thermophotovoltaic (TPV) efficiency measurement, within a closed cavity, is an integrated test which incorporates four fundamental parameters of TPV direct energy conversion. These are: (1) the TPV devices, (2) spectral control, (3) a radiation/photon source, and (4) closed cavity geometry affects. The overall efficiency of the TPV device is controlled by the TPV cell performance, the spectral control characteristics, the radiator temperature and the geometric arrangement. Controlled efficiency measurements and predictions provide valuable feedback on all four. This paper describes and compares two computer codes developed to model 16, 1 cm{sup 2} TPV cells (in a 4x4 configuration) in a cavity geometry. The first code subdivides the infrared spectrum into several bands and then numerically integrates over the spectrum to provide absorbed heat flux and cell performance predictions (assuming infinite parallel plates). The second utilizes a Monte Carlo Ray-Tracing code that tracks photons, from birth at the radiation source, until they either escape or are absorbed. Absorption depends upon energy dependent reflection probabilities assigned to every geometrical surface within the cavity. The model also has the capability of tallying above and below bandgap absorptions (as a function of location) and can support various radiator temperature profiles. The arrays are fabricated using 0.55 eV InGaAs cells with Si/SiO interference filters for spectral control and at steady state conditions, array efficiency was calculated as the ratio of the load matched power to its absorbed heat flux. Preliminary experimental results are also compared with predictions.

Physical Description

17 p.

Notes

OSTI as DE99001955

Source

  • 3. NREL conference on thermophotovoltaic (TPV) generation of electricity, Colorado Springs, CO (United States), 18-21 May 1997

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  • Other: DE99001955
  • Report No.: KAPL-P--000177
  • Report No.: K--97064;CONF-9705119--
  • Grant Number: AC12-76SN00052
  • DOI: 10.2172/325754 | External Link
  • Office of Scientific & Technical Information Report Number: 325754
  • Archival Resource Key: ark:/67531/metadc688667

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  • May 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 16, 2016, 6:08 p.m.

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Gethers, C.K.; Ballinger, C.T.; Postlethwait, M.A.; DePoy, D.M. & Baldasaro, P.F. TPV efficiency predictions and measurements for a closed cavity geometry, report, May 1, 1997; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc688667/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.