Abstract
This thesis is devoted to a study of active solar thermal systems, and focuses on analysis and design tools. The main part of this work is concerned with development of algorithms for modeling flat-plate collectors that use monolithic silica aerogel (MSA) as part of cover glazing. This study of MSA collectors also includes evaluation of the performance of the collector component, and simulation studies of solar systems with and without the use of MSA collectors. The other parts of the thesis involves evaluation of analysis and design tools algorithm concerning the solar performance prediction. Accuracy and ease-of-use has been assessed. MSA is an absorbing and scattering material in the solar part of the spectrum (0.3 to 3.0 {mu}). It is shown that isotropic scattering may be assumed, as long as the cover thickness is less than 50 mm. Analysis of scattering is usually mathematically very complex and requires a great deal of computational effort. However, a relatively fast and simple method for isotropic scattering within an absorbing and scattering medium has been proposed. MSA has a very low thermal conductivity. However, the material is partially transparent in the infrared between 3 and 5 {mu}. Due to large spectral variation in
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Citation Formats
Nordgaard, A.
Performance prediction of solar thermal systems and the use of monolithic silica aerogel to improve collector efficiency.
Norway: N. p.,
1991.
Web.
Nordgaard, A.
Performance prediction of solar thermal systems and the use of monolithic silica aerogel to improve collector efficiency.
Norway.
Nordgaard, A.
1991.
"Performance prediction of solar thermal systems and the use of monolithic silica aerogel to improve collector efficiency."
Norway.
@misc{etde_10120643,
title = {Performance prediction of solar thermal systems and the use of monolithic silica aerogel to improve collector efficiency}
author = {Nordgaard, A}
abstractNote = {This thesis is devoted to a study of active solar thermal systems, and focuses on analysis and design tools. The main part of this work is concerned with development of algorithms for modeling flat-plate collectors that use monolithic silica aerogel (MSA) as part of cover glazing. This study of MSA collectors also includes evaluation of the performance of the collector component, and simulation studies of solar systems with and without the use of MSA collectors. The other parts of the thesis involves evaluation of analysis and design tools algorithm concerning the solar performance prediction. Accuracy and ease-of-use has been assessed. MSA is an absorbing and scattering material in the solar part of the spectrum (0.3 to 3.0 {mu}). It is shown that isotropic scattering may be assumed, as long as the cover thickness is less than 50 mm. Analysis of scattering is usually mathematically very complex and requires a great deal of computational effort. However, a relatively fast and simple method for isotropic scattering within an absorbing and scattering medium has been proposed. MSA has a very low thermal conductivity. However, the material is partially transparent in the infrared between 3 and 5 {mu}. Due to large spectral variation in this region, the radiative transport will not be a local phenomenon anymore, and direct radiative communication between the boundaries may occur. The results of a simulation study of a solar heating system and a combined solar heating and cooling system are presented. In particular, the predicted performance obtained using conventional solar collectors is compared with the predicted performance using MSA collectors. 91 refs., 66 figs., 9 tabs.}
place = {Norway}
year = {1991}
month = {Mar}
}
title = {Performance prediction of solar thermal systems and the use of monolithic silica aerogel to improve collector efficiency}
author = {Nordgaard, A}
abstractNote = {This thesis is devoted to a study of active solar thermal systems, and focuses on analysis and design tools. The main part of this work is concerned with development of algorithms for modeling flat-plate collectors that use monolithic silica aerogel (MSA) as part of cover glazing. This study of MSA collectors also includes evaluation of the performance of the collector component, and simulation studies of solar systems with and without the use of MSA collectors. The other parts of the thesis involves evaluation of analysis and design tools algorithm concerning the solar performance prediction. Accuracy and ease-of-use has been assessed. MSA is an absorbing and scattering material in the solar part of the spectrum (0.3 to 3.0 {mu}). It is shown that isotropic scattering may be assumed, as long as the cover thickness is less than 50 mm. Analysis of scattering is usually mathematically very complex and requires a great deal of computational effort. However, a relatively fast and simple method for isotropic scattering within an absorbing and scattering medium has been proposed. MSA has a very low thermal conductivity. However, the material is partially transparent in the infrared between 3 and 5 {mu}. Due to large spectral variation in this region, the radiative transport will not be a local phenomenon anymore, and direct radiative communication between the boundaries may occur. The results of a simulation study of a solar heating system and a combined solar heating and cooling system are presented. In particular, the predicted performance obtained using conventional solar collectors is compared with the predicted performance using MSA collectors. 91 refs., 66 figs., 9 tabs.}
place = {Norway}
year = {1991}
month = {Mar}
}