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Method to investigate and plan the application of low temperature district heating to existing hydraulic radiator systems in existing buildings

Author

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  • Tunzi, Michele
  • Østergaard, Dorte Skaarup
  • Svendsen, Svend
  • Boukhanouf, Rabah
  • Cooper, Edward

Abstract

This study presents a method to adapt existing hydronic systems in buildings to take advantage of low temperature district heating (LTDH). Plate radiators connected to double string heating circuits were considered in an optimization procedure, based on supply and return temperatures, to obtain the required logarithmic mean temperature difference (LMTD) for a low temperature heating system. The results of the analysis are presented as the average reduction of LMTD over the heating season compared to the base case design conditions. Two scenarios were investigated based on the assumption of a likely cost reduction in the end users' energy bills of 1% for each 1 °C reduction of return and average supply and return temperatures. The results showed possible discounts of 14% and 16% respectively, due to more efficient operation of the radiators. These were achieved without any intervention in the thermal envelope or to the heating systems, through simply adjusting the temperatures according to demand and properly controlling the plate radiators with thermostatic radiator valves (TRVs).

Suggested Citation

  • Tunzi, Michele & Østergaard, Dorte Skaarup & Svendsen, Svend & Boukhanouf, Rabah & Cooper, Edward, 2016. "Method to investigate and plan the application of low temperature district heating to existing hydraulic radiator systems in existing buildings," Energy, Elsevier, vol. 113(C), pages 413-421.
    • Handle: RePEc:eee:energy:v:113:y:2016:i:c:p:413-421
    DOI: 10.1016/j.energy.2016.07.033
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    References listed on IDEAS

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    1. Dalla Rosa, A. & Christensen, J.E., 2011. "Low-energy district heating in energy-efficient building areas," Energy, Elsevier, vol. 36(12), pages 6890-6899.
    2. Lund, Henrik & Werner, Sven & Wiltshire, Robin & Svendsen, Svend & Thorsen, Jan Eric & Hvelplund, Frede & Mathiesen, Brian Vad, 2014. "4th Generation District Heating (4GDH)," Energy, Elsevier, vol. 68(C), pages 1-11.
    3. Brand, Marek & Svendsen, Svend, 2013. "Renewable-based low-temperature district heating for existing buildings in various stages of refurbishment," Energy, Elsevier, vol. 62(C), pages 311-319.
    4. Dalla Rosa, A. & Li, H. & Svendsen, S., 2011. "Method for optimal design of pipes for low-energy district heating, with focus on heat losses," Energy, Elsevier, vol. 36(5), pages 2407-2418.
    5. Dalla Rosa, A. & Boulter, R. & Church, K. & Svendsen, S., 2012. "District heating (DH) network design and operation toward a system-wide methodology for optimizing renewable energy solutions (SMORES) in Canada: A case study," Energy, Elsevier, vol. 45(1), pages 960-974.
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