Conferences
Articles
report a problemDetermination of optimum network layout for low-energy district heating systems with different substation types
Publication Date: 28.10.2011
| Pages: 7-12
Tol, H.İ.1, Svendsen, S.1
1 Technical University of Denmark, Department of Civil Engineering, Section of Building Physics and Services, Brovej, Bygning 118, DK-2800, Kgs. Lyngby, Denmark
e-mail: hatol@byg.dtu.dk, ss@byg.dtu.dk
DOI: -
Abstract
In this paper three different District Heating (DH) network types, which comprise substations with storage tank and with instantaneous heat exchanger (each for domestic hot water production); and booster pumps installed in the beginning section of each street at the latter network type, are pointed out with comparisons given in the point of dimensions and energy efficiency of the DH network. Also, two different network layouts –branched network with bypasses, installed at the end-users, and looped network without bypasses–, which are used to prevent the excessive temperature drop in the supply line during summer months are presented with the focus given to comparison of them in the point of energy efficiency. Results of dynamic simulations, carried out in the Termis software by use of randomly generated heat demand scenarios based on simultaneity factor effect in each pipe segment of the DH network are reported.
Keywords
District Heating System, Low-Energy, Network Layout, Substation, Dynamic AnalysesReferences
[1] H. Lund, Renewable energy systems: the choice and modeling of 100% renewable solutions, Elsevier Science & Technology, MA, USA, 2009, ISBN: 978-0-12-375028-0.
[2] H. Lund, B. Möller, B.V. Mathiesen and A. Dyrelund, "The role of district heating in future renewable energy systems", Energy, vol. 35, no. 3, pp. 1381-1390, March 2010.
[3] U. Persson and S. Werner, "Heat distribution and the future competitiveness of district heating", Applied Energy, vol. 88, no. 3, pp. 568-576, March 2011.
[4] A. Dalla Rosa, H. Li and S. Svendsen, "Method for optimal design of pipes for low-energy district heating,with focus on heat losses", Energy, vol. 36, no. 5, pp.2407-2018, 2011.
[5] A. Dalla Rosa, H. Li and S. Svendsen, "Steady state heat losses in pre-insulated pipes for low-energy district heating", Proceedings of The 12th International Symposium on District Heating and Cooling, Talinn, Estonia, Sep. 5 - 7, 2010, p. 83.
[6] H. Li, A. Dalla Rosa and S. Svendsen, "Design of low temperature district heating network with supply water recirculation", Proceedings of The 12th International Symposium on District Heating and Cooling, Talinn, Estonia, Sep. 5 - 7, 2010, pp. 73-80.
[7] P. Alberg Østergaard, B.V. Mathiesen, B. Möller and H. Lund, "A renewable energy scenario for Aalborg Municipality based on low-temperature geothermal heat, wind power and biomass", Energy, vol. 35, no. 12, pp. 4892-4901, Dec. 2010.
[8] A. Poredos and A. Kitanovski, "Exergy loss as a basis for the price of thermal energy", Energy Conversion and Management, vol. 43, no. 16, pp. 2163-2173, Nov. 2002.
[9] K. Çomaklı, B. Yüksel and Ö. Çomaklı, "Evaluation of energy and exergy losses in district heating network", Applied Thermal Engineering, vol. 24, no. 7, pp. 1009-1017, May 2004.
[10] P.K. Olsen, H. Lambertsen, R. Hummelshøj, et al., "A new low-temperature district heating system for lowenergy buildings", Proceedings of The 11th International Symposium on District Heating and Cooling, Reykjavik, Iceland, Aug. 31 - Sep. 2, 2008.
[11] T. Karlsson and A. Ragnarsson, "Use of Very Low Temperature Geothermal Water in Radiotor Heating Systems", Proceedings of World Geothermal Congress, Firenze, Italy, May 18 - 31, 1995, pp. 2195-2198.
[12] O. Paulsen, J. Fan, S. Furbo and J.E. Thorsen, "Consumer Unit for Low Energy District Heating Net", Proceedings of The 11th International Symposium on District Heating and Cooling, Reykjavik, Iceland, Aug. 31 - Sep. 2, 2008.
[13] H.İ. Tol and S. Svendsen, "Improving the Dimensioning of Piping Networks and Network Layouts in Low-Energy District Heating Systems Connected to Low-Energy Buildings: A case study in Roskilde, Denmark", Unpublished Raw Data, 2011.
[14] H.İ. Tol and S. Svendsen, "Design of low-energy district heating system for a settlement with lowenergy buildings", The 3rd International Symposium on Environmental Management towards Sustainable Technologies, Zagreb, Croatia, Oct. 26 - 28, 2011.
[15] "Danish Building Regulation 2010", 2011.
[16] M. Brand, J.E. Thorsen, S. Svendsen and C.H. Christiansen, "A direct heat exchanger unit used for domestic hot water supply in a single-family house supplied by low energy district heating", Proceedings of The 12th International Symposium on District Heating and Cooling, Talinn, Estonia, Sep. 5 - 7, 2010, pp. 60-68.
[17] M. Brand, A. Dalla Rosa and S. Svendsen, "Performance of low temperature district heating systems for low energy houses", International Energy Agency Energy Conversation in Buildings and Community Systems Annex 49, 2010, pp. 174-183.
[18] C.H. Christiansen, J. Worm, H. Jørgensen, J.E. Thorsen, et al., "Demonstration of low energy district heating system for low energy building in Ringgårdens Afd. 34 in Lystrup [Demonstration af lavenergifjernvarme til lavenergibyggeri i boligforeningen Ringgårdens afd. 34 i Lystrup] [in Danish]", Final Report 2011 Maj. Copenhagen: Teknologisk Institut: 2011 Maj. 104 p. Report No.: EUDP 2008-II. Available from: http://www.ibe.dtu.dk/upload/institutter/byg/publications/rapporter/byg-r250.pdf.
[19] C.H. Christiansen, O. Paulsen, B. Bøhm, et al., "Development and demonstration of low-energy district heating for low-energy buildings. Main report and appendices [Udvikling og demonstration af lavenergi-fjernvarme til lavenergibyggeri. Hovedrapport og bilag] [In Danish]", Teknologisk Institut; 2009 March. Report No: EFP 2007. Available from : www.teknologisk.dk/_root/media/34221_EFP%202007.pdf.
[20] H.V. Larsen, H. Pálsson, B. Bøhm and H.F. Ravn, "Aggregated dynamic simulation model of district heating networks", Energy Conversion and Management, vol. 43, no. 8, pp. 995-1019, May 2002.
[21] E.H. Mathews, H.F. Brenkman and P.A.J. Köhler, "Optimization of pipe networks using standardized pipes", R&D Journal, vol. 10, no. 1- 3, pp. 45-51, July 1994.
[22] A. Benonysson, B. Bøhm and H.F. Ravn, "Operational optimization in a district heating system", Energy Conversion and Management, vol. 36, no. 5, pp. 297-314, May 1995.
[23] J. Overgaard and S. Knudsen, "District heating networks - choosing the right pipe dimensions", DBDH, 2006.
[24] G. Genon, M.F. Torchio, A. Poggio and M. Poggio, "Energy and environmental assessment of small district heating systems: Global and local effects in two case-studies", Energy Conversion and Management, vol. 50, no. 3, pp. 522-529, March 2009.
[25] M. Rämä and K. Sipilä, "Challenges on low heat density district heating network design", Proceedings of The 12th International Symposium on District Heating and Cooling, Talinn, Estonia, Sep. 5 - 7, 2010, pp. 69-72.
[26] R. Langendries, "Low return temperature (LRT) in district heating", Energy and Buildings, vol. 12, no. 3, pp. 191-200, Nov. 1988.
[27] H.V. Larsen, B. Bøhm and M. Wigbels, "A comparison of aggregated models for simulation and operational optimization of district heating networks", Energy Conversion and Management, vol. 45, no. 7-8, pp. 1119-1139, May 2004.
Content from this work may be used under the terms of the
Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, proceedings citation and DOI.
Open Access
Citation Download
2021-02-07
PUPLISHED
Metrics
- 9 Total Downloads
- 909 Total Scanning
Share this article
 network types, which comprise substations with storage tank and with instantaneous heat exchanger (each for domestic hot water production); and booster pumps installed in the beginning section of each street at the latter network type, are pointed out with comparisons given in the point of dimensions and energy efficiency of the DH network.)
