Conference article

Lessons Learnt from Network Modelling of a Low Heat Density District Heating System

Itzal del Hoyo Arce
IK4-TEKNIKER, Parke Teknologikoa, Eibar, Spain

Susana López Perez
IK4-TEKNIKER, Parke Teknologikoa, Eibar, Spain

Saioa Herrero López
IK4-TEKNIKER, Parke Teknologikoa, Eibar, Spain

Iván Mesonero Dávila
IK4-TEKNIKER, Parke Teknologikoa, Eibar, Spain

Download articlehttp://dx.doi.org/10.3384/ecp15118393

Published in: Proceedings of the 11th International Modelica Conference, Versailles, France, September 21-23, 2015

Linköping Electronic Conference Proceedings 118:42, s. 393-400

Show more +

Published: 2015-09-18

ISBN: 978-91-7685-955-1

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

This paper presents the lessons learnt during the development of a library for the modelling of district heating systems (DH systems), especially focusing on the distribution network. The library was built based on elements from the Modelica Standard Library (Modelica Association, 2012) and the NewThermal library (Lopez, del Hoyo, 2013). The modelling strategy chosen is described. Furthermore, the requirements established by the DH networks are set out as well as the models created in response to these demands. Finally, the artificial diffusion phenomenon, present in the simulation of this kind of large thermo-fluid systems, is described.

Keywords

district heating modelling; plastic pipe model; buried pipe model; numerical diffusion; courant number; transport delay; thermo-fluid simulation

References

ASHRAE Handbook: Heating, Ventilating & Air-Conditioning Systems, chapter 11. 2008.

Basciotti D., Pol O., A theoretical study of the impact of using small scale thermo chemical storage units in district heating networks. Energy Department AIT, Austria (2012).

Bottorf, J.D. Summary of thermal conductivity as a function of moisture. 1951.

Boysen, Thorsen. Technical paper, Hydraulic balance in a district heating system (2007).

Dassault Systèmes AB. Dymola User Manual (2015).

Svend Frederiksen, Seven Werner. District Heating and Cooling. Studentlitteratur first edition (2013).

R.J. Leveque (2007). Finite Difference Methods for Ordinary and Partial Differential Equations. ISBN 978-0-898716-29-0.

Susana López, Itzal del Hoyo. Proposal for standardization of Heat Transfer Modelling in NewThermal Library. 10th International Modelica Conference (Lund), 2014.

James McCauley. Steam distribution system deskbook (ISBN 0-88173-303-2), 2000.

Modelica Association, (2012). A Unified Object-Oriented Language for Physical System Modeling, Modelica® Emmanuel Onillon, District energy flow optimization taking into account building flexibilities. International Conference Sustainable Places (2014).

Halldór Pálsson. Methods for Planning and Operating Decentralized Combined Heat and Power Plants. Riso National Laboratory, Roskilde, Technical University if Denmark, 2000.

Halldór Pálsson, Helge V. Larsen, et al. Equivalent models of district heating system, Technical University of Denmark and Risø National Laboratory, 1999.

Citations in Crossref