Files:DescriptionFile size FormatBrowse
Fulltext0.75 MBPDF (requires Acrobat Reader)Previous | Next
  
Authors:Arnav Pathak: Fraunhofer Institute for Building Physics, Dept. Indoor Climate, Germany
Victor Norrefeldt: Fraunhofer Institute for Building Physics, Dept. Indoor Climate, Germany
Gunnar Grün: Fraunhofer Institute for Building Physics, Dept. Indoor Climate, Germany
Publication title:Modelling of Radiative Heat Transfer in Modelica with a Mobile Solar Radiation Model and a View Factor Model
Conference:Proceedings of the 9th International MODELICA Conference; September 3-5; 2012; Munich; Germany
Publication type: Abstract and Fulltext
Issue:076
Article No.:027
Abstract:This paper presents a model to estimate the solar radiation under clear sky conditions over stationary; moving as well as flying objects. For the latter it is important to predict the peak solar irradiance under clear sky condition to calculate maximum possible solar thermal loading. In this paper results of irradiation over surface on ground and over aircraft windows and windshields at cruise altitude are presented. Another model implemented here; calculates the view factor between two or more surfaces. Determination of the long-wave radiant heat exchange between two or more surfaces or heat exchange with a surface itself requires a view factor matrix. There are several analytical solutions available to calculate view factor for simple and known configurations. Many building simulation programs estimate the view factors in a simplified way; especially when complex geometries are involved. The simplified approach may result in high errors of surface temperatures; which can further cause error in energy balance and estimation of comfort level. The purpose of creating this model is to calculate the view factor between complex geometries. The view factor matrices of an enclosed space and geometry with openings on its surfaces are presented in this paper. A sensitivity analysis of a view factor matrix is also presented.
Language:English
Keywords:Solar radiation modeling; View factor calculation; Modelica models; Long-wave radiant heat exchange
Year:2012
No. of pages:8
Pages:271-278
ISBN:978-91-7519-826-2
Series:Linköping Electronic Conference Proceedings
ISSN (print):1650-3686
ISSN (online):1650-3740
File:http://www.ep.liu.se/ecp/076/027/ecp12076027.pdf
Available:2012-11-19
Publisher:Linköping University Electronic Press; Linköpings universitet

REFERENCE TO THIS PAGE
Arnav Pathak, Victor Norrefeldt, Gunnar Grün (2012). Modelling of Radiative Heat Transfer in Modelica with a Mobile Solar Radiation Model and a View Factor Model, Proceedings of the 9th International MODELICA Conference; September 3-5; 2012; Munich; Germany http://dx.doi.org/10.3384/ecp12076271 (accessed 10/22/2014)