skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Modeling of flat-plate collectors based on monolithic silica aerogel

Abstract

This paper presents a new method for predicting the radiative transfer in an absorbing and isotropically scattering, non-gray plane-parallel atmosphere. The technique is based upon the {cflx F} ( F-hat') concept and was developed to determine the radiative transfer at short wavelengths for the transparent insulation material, monolithic silica aerogel. The angular dependence of solar transmittance of diffuse and ground reflected radiation is evaluated along with the 'transmittance-absorptance product' of a collector. The {cflx F} technique is also used to determine the IR transmission of the cover from which the overall loss coefficient for a flat-plate collector constructed with aerogel filled covers is determined. The performance of a system using aerogel collectors is compared to systems using other types of high performing collectors. It is shown that, at least for the system investigated, the decrease in solar transmittance of monolithic silica aerogel is more than compensated by the decrease in thermal losses.

Authors:
 [1];  [2]
  1. Univ. of Trondheim (Norway)
  2. Univ. of Wisconsin, Madison (United States)
Publication Date:
OSTI Identifier:
6967220
Resource Type:
Journal Article
Journal Name:
Solar Energy (Journal of Solar Energy Science and Engineering); (United States)
Additional Journal Information:
Journal Volume: 49:5; Journal ID: ISSN 0038-092X
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; FLAT PLATE COLLECTORS; MATHEMATICAL MODELS; SILICON OXIDES; RADIANT HEAT TRANSFER; THERMAL INSULATION; ISOTROPY; SOLAR RADIATION; CHALCOGENIDES; ENERGY TRANSFER; EQUIPMENT; HEAT TRANSFER; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; SILICON COMPOUNDS; SOLAR COLLECTORS; SOLAR EQUIPMENT; STELLAR RADIATION; 141000* - Solar Collectors & Concentrators; 990200 - Mathematics & Computers

Citation Formats

Nordgaard, A, and Beckman, W A. Modeling of flat-plate collectors based on monolithic silica aerogel. United States: N. p., 1992. Web. doi:10.1016/0038-092X(92)90111-M.
Nordgaard, A, & Beckman, W A. Modeling of flat-plate collectors based on monolithic silica aerogel. United States. https://doi.org/10.1016/0038-092X(92)90111-M
Nordgaard, A, and Beckman, W A. Sun . "Modeling of flat-plate collectors based on monolithic silica aerogel". United States. https://doi.org/10.1016/0038-092X(92)90111-M.
@article{osti_6967220,
title = {Modeling of flat-plate collectors based on monolithic silica aerogel},
author = {Nordgaard, A and Beckman, W A},
abstractNote = {This paper presents a new method for predicting the radiative transfer in an absorbing and isotropically scattering, non-gray plane-parallel atmosphere. The technique is based upon the {cflx F} ( F-hat') concept and was developed to determine the radiative transfer at short wavelengths for the transparent insulation material, monolithic silica aerogel. The angular dependence of solar transmittance of diffuse and ground reflected radiation is evaluated along with the 'transmittance-absorptance product' of a collector. The {cflx F} technique is also used to determine the IR transmission of the cover from which the overall loss coefficient for a flat-plate collector constructed with aerogel filled covers is determined. The performance of a system using aerogel collectors is compared to systems using other types of high performing collectors. It is shown that, at least for the system investigated, the decrease in solar transmittance of monolithic silica aerogel is more than compensated by the decrease in thermal losses.},
doi = {10.1016/0038-092X(92)90111-M},
url = {https://www.osti.gov/biblio/6967220}, journal = {Solar Energy (Journal of Solar Energy Science and Engineering); (United States)},
issn = {0038-092X},
number = ,
volume = 49:5,
place = {United States},
year = {1992},
month = {11}
}