Submit Your Proceedings

Thank you for considering to join us with your high-quality scientific content. Note that our service is free for website users as well as organizers/publishers, the rightsholders nor no membership is required.

You can submit all your questions, opinions, suggestions and complaints using the contact form.

info@conferencearticles.com

Effect of design static pressure level on energy efficiency at low-energy district heating systems

Submit Your Proceedings

You can submit all your questions, opinions, suggestions and complaints using the contact form

Effect of design static pressure level on energy efficiency at low-energy district heating systems

Publication Date: 28.10.2011 |   Pages: 29-36
Hakan İbrahim Tol, Svend Svendsen
Department of Civil Engineering Technical University of Denmark hatol@byg.dtu.dk

DOI: -

Abstract

Low-Energy District Heating (DH) systems with low-temperature operations, such as 55 °C in terms of supply and 25 °C in terms of return, were considered to be the 4th generation of the DH systems for the low-energy future with energy efficiencies focused to be achieved at newly built and existing buildings by the Danish building regulations. Therefore focus has been given to reduce the heat demand of the consumer site with integration of low-energy buildings, to be considered for new settlements and with renovation of existing buildings to low-energy class. The reduction of heat demand increases the ratio of heat loss from the DH network in comparison to the heat supplied to the district. In our former studies, the low-energy DH system was optimized with the aim of reducing the heat loss from the low-energy DH network in a certain limit of static pressure level of 10 bara. Thus, in this present study different levels of static pressure were investigated in design stage to discover the effects of different pressure levels on optimal pipe dimensions observed by use of the dimensioning method defined for low-energy DH networks.

Keywords

Low-Energy, District Heating, Static Pressure, Optimization

References

[1] Aggerholm S, Thomsen KE, Wittchen KB, (2011), "Implementation of the EPBD in Denmark - Status in November 2010". Available from: http://www.buildup.eu/publications/16198 (accessed at 09.10.2011).
[2] Tommerup H, Rose J, Svendsen S, (2007), "Energy-efficient houses built according to the energy performance requirements introduced in Denmark in 2006". Energy and Buildings, 39(10), 1123-1130.
[3] Wiltshire R, (2011), "Low temperature district energy systems". Building Services, Mechanical and Building Industry Days,16, 1-13.
[4] Genon G, Torchio MF, Poggio A, Poggio M, (2009), "Energy and environmental assessment of small district heating systems: Global and local effects in two case-studies". Energy Conversion and Management,50, 522-529.
[5] Lund H, "Renewable energy systems: the choice and modeling of 100% renewable solutions". MA, USA: Elsevier Science & Technology.
[6] Lund H, Mathiesen BV, (2009), "Energy system analysis of 100% renewable energy systems—The case of Denmark in years 2030 and 2050". Energy, 34, 524-531.
[7] Lund H, Möller B, Mathiesen BV, Dyrelund A., (2010), "The role of district heating in future renewable energy systems". Energy, 35, 1381-1390.
[8] Persson U, Werner S., (2011), "Heat distribution and the future competitiveness of district heating". Applied Energy, 88, 568-576.
[9] Christiansen CH, Paulsen O, Bøhm B, Thorsen JE, Ting Larsen C, Jepsen BK et al. (2009), "Development and demonstration of low-energy district heating for low-energy buildings. Main report and appendices [In Danish]". Teknologisk Institut, Report No: EFP 2007, 6-25.
[10] Christiansen CH, Worm J, Jørgensen H, Thorsen JE, Bennetsen J, Larsen CT et al. (2011) "Demonstration of low energy district heating system for low energy building in ringgårdens Afd. 34 in Lystrup [in Danish]". Teknologisk Institut, Report No: EUDP 2008-II, 1-104.
[11] Olsen PK, Lambertsen H, Hummelshøj R, Bøhm B, Christiansen CH, Svendsen S et al. (2008), "A new low-temperature district heating system for low-energy buildings", in The 11th International Symposium on District Heating and Cooling, Aug 31-Sep 2, Reykjavik, Iceland.
[12] Paulsen O, Fan J, Furbo S, Thorsen JE. (2008), "Consumer Unit for Low Energy District Heating Net", in The 11th International Symposium on District Heating and Cooling, Aug 31-Sep 2, Reykjavik, Iceland,1-8.
[13] Foged M. (1999), "Low temperature operation". DBDH , 3-9.
[14] Thorsen JE, Christiansen CH, Brand M, Olesen PK, Larsen CT. (2011), "Experiences on lowtemperature district heating in Lystrup - Denmark", in International Conference on District Heating and Cooling, March 20-22, Portorož, Slovenia.
[15] Thorsen JE, Kristjansson H. (2006), "Cost considerations on storage tank versus heat exchanger for hot water preparation", in 10th International Symposium District Heating and Cooling, Hanover.
[16] Tol Hİ, Svendsen S. (2012), "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". Energy, 38, 276-290.
[17] Tol Hİ, Svendsen S. (2011), "Design of low-energy district heating system for a settlement with low-energy buildings", in 3rd Symposium on Environment Management (SEM-ECO), Oct. 26-28, Zagreb, Croatia, 166-171.
[18] Danfoss, "8 steps - control of heating system".
[19] Stræde B. (2002), "Pressure oscillation in district heating installation", Danfoss, Report No: VF.55, Nordborg, Denmark.
[20] Boysen H. (2003), "Differential pressure controllers as a tool for optimization of heating systems",Danfoss, Report No: VF.CB.U1, Nordborg, Denmark.
[21] Boysen H, Thorsen JE. (2011) "Hydraulic balance in a district heating system", Danfoss, Report No: VF.LR.C2.02, Nordborg, Denmark.
[22] Tol Hİ, Svendsen S. (2012), "Operational Planning of low-energy district heating systems connected to existing buildings", in International Conference on Renewable Energy: Generation and Applications (ICREGA'12), March 4-7, Al-Ain, UAE.
[23] Tol Hİ, Svendsen S. (2011), "Determination of optimum network layout for low-energy district heating systems with different substation types", in The Third International Renewable Energy Congress (IREC 2011), Dec. 20-22, Hammamet, Tunisia, 179-184.
[24] Sanks RL. (1998), "Pumping station design", United States of America: Elsevier Gulf.
[25] Tol Hİ, Svendsen S. (2012), "Optimal dimensioning of low-energy district heating networks with operational planning - Case study for existing buildings" in 11th International Conference on Sustainable Energy Technologies (SET-2012), Sep. 2-5, Vancouver, Canada, Accepted to be Published.
[26] Elmegaard B. (2010), "Exergy Analysis - Lecture Notes of the course 'Energy Systems - Analysis, Design, and Optimization'", Presented at 16/02/2010.
[27] Tol Hİ, Svendsen S. (2012), "A comparative study on substation types and network layouts in connection with low-energy district heating systems". Energy Conversion and Management, Accepted to be Published. Pacific Rim Energy and Sustainability Congress August 6-9, 2012 ANA Crowne Plaza, Hiroshima, Japan

 

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
  • 6 Total Downloads
  • 442 Total Scanning
Share this article
0.0650