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Conceptual study of a solar-assisted low-temperature district heating substation
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
École des Mines de Nantes - EMN, Energy Systems and Environment - DSEE.
École des Mines de Nantes - EMN, Energy Systems and Environment - DSEE.
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2015 (English)In: Book of abstracts: International Conference on Smart EnergySystems and 4th Generation District Heating: Low-temperature district heating and buildings / [ed] Lund, H. (Ed.), & Mathiesen, B. V., Copenhagen, DK: Aalborg Universitetsforlag, 2015Conference paper, Abstract (Refereed)
Abstract [en]

At present, the viability of Low-Temperature District Heating (LTDH) systems has already been tested and demonstrated. Even so, for LTDH to be successfully implemented, further ideas are needed in order to improve the flexibility and effectiveness. In this study, we analyze the performance of a local LTDH network for a multi-dwelling low-energy building supplied by both a roof-mounted solar collector and the conventional DH network via a LTDH substation. The DH network serves as a short-term storage buffer, so no heat storages are required. The collector’s size is chosen based on the available roof area, independently from the building’s loads, and three possible connection configurations were simulated. A mix of both the existing DH forward and return flows are used as thermal energy sources. The results show that more than 15% of the summer heat demand in the LTDH network can be covered by the roof-mounted solar collector. With a feed-in contract, heat costs savings range 3-6% annually according to the Swedish system. System integration in LTDH from the design phase has the potential to enhance the recovery of solar thermal energy, increase its conversion efficiency, and in general, to improve the utilization of low-grade thermal energy sources.

Place, publisher, year, edition, pages
Copenhagen, DK: Aalborg Universitetsforlag, 2015.
Keyword [en]
Low-Temperature District Heating (LTDH), Solar Collector, Substation, Network Storage
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-185713OAI: oai:DiVA.org:kth-185713DiVA: diva2:922991
Conference
International Conference on Smart Energy Systems and 4th Generation District Heating: Aalborg University, Copenhagen Campus on 25-26 August 2015.
Note

QC 20160510

Available from: 2016-04-25 Created: 2016-04-25 Last updated: 2016-08-16Bibliographically approved

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