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Techno-economic assessment of Thermal Energy Storage integration into Low Temperature District Heating networks
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Thermal Energy Storage)
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. École des Mines de Nantes - EMN, Energy Systems and Environment - DSEE. (Thermal Energy Storage)ORCID iD: 0000-0002-0194-8317
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Thermal Energy Storage)ORCID iD: 0000-0001-6982-2879
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. (Thermal Energy Storage, Energy Technology)ORCID iD: 0000-0001-9556-552X
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2016 (English)In: Book of abstracts: 2nd International Conference on Smart Energy Systems and 4th Generation District Heating / [ed] Henrik Lund, Aalborg Universitetsforlag, 2016Conference paper, (Other academic)
Abstract [en]

Thermal energy storage (TES) systems are technologies with the potential to enhance the efficiency and the flexibility of the coming 4th generation low temperature district heating (LTDH). Their integration would enable the creation of smarter, more efficient networks, benefiting both the utility and the end consumers. This study aims to develop a comparative assessment of TES systems, both latent and sensible heat based. First, a techno-economic analysis of several TES systems is conducted to evaluate their suitability to be integrated into LTDH. Then, potential scenarios of TES integration are analysed in a case study of a LTDH network. This is complemented with a review of current DH legislation focused on the Swedish case, with the aim of taking into consideration the present situation, and changes that may support some technologies over others. The results of the analysis show that sensible heat storage is still preferred to latent heat when coupled with LTDH: the cost per kWh stored is still 15% higher for latent heat in systems below 5MWh of storage size; though, they require just half of the volume. However, it is expected that the cost of latent heat storage systems will decline in the future, making them more competitive. From a system perspective, the introduction of TES systems into the network results in an increase in flexibility leading to lower heat production costs by load shifting: by running the production units with lower marginal heat production costs for longer periods and with high efficiency, and thus reducing the operating hours of the other more expensive operating units during peak load conditions. These results may also be extended to the case when heat generation is replaced by renewable, intermittent energy sources; thus increasing profits, reducing fuel consumption, and consequently emissions. This study represents a step forward in the development of a more efficient DH system through the integration of TES which will play a crucial role in future smart energy system.

Place, publisher, year, edition, pages
Aalborg Universitetsforlag, 2016.
Keyword [en]
Low-Temperature District Heating (LTDH), Thermal Energy Storage (TES), Latent heat, Sensible heat
National Category
Engineering and Technology
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-210803OAI: oai:DiVA.org:kth-210803DiVA: diva2:1120141
Conference
2nd International Conference on Smart Energy Systems and 4th Generation District Heating, 27-28 September 2016 · Aalborg, Denmark
Projects
SELECT+
Available from: 2017-07-05 Created: 2017-07-05 Last updated: 2017-07-05

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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