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Title: Lessons learned on closed cavity thermophotovoltaic system efficiency measurements

Abstract

Previous efficiency measurements have highlighted that to accurately measure and predict thermophotovoltaic (TPV) integrated cell or array efficiencies, a thorough understanding of the system is required. This includes knowledge of intrinsic diode and filter characteristics, radiative surface properties of all materials used within the cavity, and an intimate knowledge of the radiator/photon source. As a result of these and other lessons learned, the cavity test fixture used in earlier experiments was redesigned. To reduce radiator temperature gradients, the radiator was oversized and thickened, cavity walls were eliminated, the diode heat sink and shielding material were separated, and the cold side was redesigned to incorporate a steady state heat absorbed measurement technique. This redesigned test fixture provides an isothermal radiator and significantly enhances calorimetry capabilities. This newly designed cavity test fixture, in conjunction with the Monte Carlo Photon Transport code RACER-X, was used to improve and demonstrate the understanding of in-cavity TPV diode/module system efficiency testing. A single TPV diode was tested in this new fixture and yielded good agreement between measurements and predictions.

Authors:
; ;  [1]
  1. Lockheed Martin Corp., Schenectady, NY (United States)
Publication Date:
Research Org.:
Knolls Atomic Power Lab. (KAPL), Niskayuna, NY (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
OSTI Identifier:
307873
Report Number(s):
KAPL-P-000126; K-98170; CONF-981055-
ON: DE99001633; TRN: AHC29905%%50
DOE Contract Number:  
AC12-76SN00052
Resource Type:
Conference
Resource Relation:
Conference: 4. National Renewable Energy Laboratory (NREL) conference on thermophotovoltaic generation of electricity, Denver, CO (United States), 11-14 Oct 1998; Other Information: PBD: Oct 1998
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; THERMOPHOTOVOLTAIC CONVERTERS; TEST FACILITIES; MODIFICATIONS; DESIGN; CALORIMETRY; ENERGY EFFICIENCY; ENERGY ABSORPTION; THERMAL RADIATION

Citation Formats

Gethers, C K, Ballinger, C T, and DePoy, D M. Lessons learned on closed cavity thermophotovoltaic system efficiency measurements. United States: N. p., 1998. Web.
Gethers, C K, Ballinger, C T, & DePoy, D M. Lessons learned on closed cavity thermophotovoltaic system efficiency measurements. United States.
Gethers, C K, Ballinger, C T, and DePoy, D M. Thu . "Lessons learned on closed cavity thermophotovoltaic system efficiency measurements". United States. https://www.osti.gov/servlets/purl/307873.
@article{osti_307873,
title = {Lessons learned on closed cavity thermophotovoltaic system efficiency measurements},
author = {Gethers, C K and Ballinger, C T and DePoy, D M},
abstractNote = {Previous efficiency measurements have highlighted that to accurately measure and predict thermophotovoltaic (TPV) integrated cell or array efficiencies, a thorough understanding of the system is required. This includes knowledge of intrinsic diode and filter characteristics, radiative surface properties of all materials used within the cavity, and an intimate knowledge of the radiator/photon source. As a result of these and other lessons learned, the cavity test fixture used in earlier experiments was redesigned. To reduce radiator temperature gradients, the radiator was oversized and thickened, cavity walls were eliminated, the diode heat sink and shielding material were separated, and the cold side was redesigned to incorporate a steady state heat absorbed measurement technique. This redesigned test fixture provides an isothermal radiator and significantly enhances calorimetry capabilities. This newly designed cavity test fixture, in conjunction with the Monte Carlo Photon Transport code RACER-X, was used to improve and demonstrate the understanding of in-cavity TPV diode/module system efficiency testing. A single TPV diode was tested in this new fixture and yielded good agreement between measurements and predictions.},
doi = {},
url = {https://www.osti.gov/biblio/307873}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {10}
}

Conference:
Other availability
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