Article | Proceedings of the 10<sup>th</sup> International Modelica Conference; March 10-12; 2014; Lund; Sweden | The Modelica Thermal Model Generation Tool for Automated Creation of a Coupled Airflow; Radiation Model and Wall Model in Modelica Linköping University Electronic Press Conference Proceedings
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Title:
The Modelica Thermal Model Generation Tool for Automated Creation of a Coupled Airflow; Radiation Model and Wall Model in Modelica
Author:
Arnav Pathak: Fraunhofer Institute for Building Physics, Deptartment Indoor Climate, Germany Victor Norrefeldt: Fraunhofer Institute for Building Physics, Deptartment Indoor Climate, Germany Abdellah Lemouedda: Fraunhofer Institute for Building Physics, Deptartment Indoor Climate, Germany Gunnar Grün: Fraunhofer Institute for Building Physics, Deptartment Indoor Climate, Germany
DOI:
10.3384/ecp14096115
Download:
Full text (pdf)
Year:
2014
Conference:
Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden
Issue:
096
Article no.:
012
Pages:
115-124
No. of pages:
10
Publication type:
Abstract and Fulltext
Published:
2014-03-10
ISBN:
978-91-7519-380-9
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet

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This paper presents the Modelica Thermal Model Generation Tool. The aim of this tool is to enable the user to set up a geometrically correct thermal model for complex geometries that allows predicting the impact of heated/heating devices and their location both in terms of airflow pattern and radiation distribution. Using a geometry file exported from CAD software; the tool distributes wall facets; air nodes and computes the long-wave radiant view factor matrix for obstructed and unobstructed surfaces. This information is exported as ready to use Modelica code. The zonal model VEPZO is used to model airflow within a domain (enclosed space). This model allows predicting airflow and air temperature distribution in space on a coarse mesh and thus computes faster than classical CFD computations. Walls are subdivided on the same grid as the zonal model is set upon. For each wall facet; the Modelica Thermal Model Generation Tool computes the view factors to the other facets in the domain.

Comparison of simulated results with test data and application of the Modelica Thermal Model Generation Tool for a room with radiant heating and for the cooling of an aircraft cockpit are presented in this paper.

Keywords: Thermal Model; VEPZO; Airflow Simulation; View Factor Calculation; Long-wave Radiant Heat Exchange; LowRad

Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden

Author:
Arnav Pathak, Victor Norrefeldt, Abdellah Lemouedda, Gunnar Grün
Title:
The Modelica Thermal Model Generation Tool for Automated Creation of a Coupled Airflow; Radiation Model and Wall Model in Modelica
DOI:
http://dx.doi.org/10.3384/ecp14096115
References:

[1] Norrefeldt, V., Andersson, D., Pathak, A. et al.: The Indoor Climate Library and its application to heat and moisture transfer in a vehicle cabin, 9th Modelica Conference, Munich, Germany, 03.-05. september 2012.

[2] Wetter, M.: Modelica library for building heating, ventilation and air-conditioning systems, 7th International Modelica Conference, Como, Italy, 20.-22. september
2009.

[3] Wetter, M.: Multizone airflow model in Modelica, 5th Modelica Conference, Vienna, 4.-5.september 2006.

[4] Bonvini, M., Leva, A.: Object-oriented subzonal room models for energy-related building simulation, 8th Modelica Conference, 20.-22. march 2011, Dresden,
Germany. DOI: 10.3384/ecp11063276

[5] Wetter, M., Zuo, W., Nouidui, T.: Modeling of heat transfer in rooms in the Modelica"Buildings" Library, Building Simulation, Sydney, Australia, 14.-16. november 2011.

[6] Norrefeldt, V., Grün, G.: VEPZO - Velocity Propagating Zonal Model for the prediction of airflow pattern and temperature distribution in enclosed spaces, 9th Modelica Conference, Munich, Germany, 03.-05. september 2012.

[7] Pathak, A., Norrefeldt, V., Grün, G.: Modelling of radiative heat transfer in Modelica with a mobile solar radiation model and a view factor model, 9th Modelica Conference, September 3-5, Munich, Germany.

[8] Paraview: Paraview, www.paraview.org, page consulted 05.12.2013.

Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden

Author:
Arnav Pathak, Victor Norrefeldt, Abdellah Lemouedda, Gunnar Grün
Title:
The Modelica Thermal Model Generation Tool for Automated Creation of a Coupled Airflow; Radiation Model and Wall Model in Modelica
DOI:
https://doi.org10.3384/ecp14096115
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