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Assessing the techno-economic impact of low-temperature subnets in conventional district heating networks
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
École des Mines de Nantes - EMN, Energy Systems and Environment - DSEE.
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
2017 (English)In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 116, no C, 260-272 p.Article in journal (Refereed) Published
Abstract [en]

The 4th generation Low-Temperature District Heating (LTDH) is envisioned as a more efficient and environmentally friendly solution to provide heating services to the building stock. Specifically, in countries already with a large share of well-established DH systems, conventional DH and LTDH technologies will be operating simultaneously in the near future. Newly built or refurbished buildings have lower heat demands, which in combination with LTDH brings potential savings compared to conventional DH. This work explores the advantages in DH operation by connecting these loads via LTDH subnets to a conventional DH system, supplied by a Combined Heat and Power (CHP) plant. A techno-economic analysis was performed, through modelling and simulation, by estimating the annual DH operating costs and revenues achieved by the reduction in return temperatures that LTDH would bring. The savings are related to: (1) the reduction in distribution heat losses in the return pipe; and (2) lower pumping power demand. Likewise, additional revenues are assessed from: (3) improved Power-to-Heat ratio for electricity production; and (4) enhanced heat recovery through Flue Gas Condensation (FGC). The annual savings per kWh of delivered heat are estimated as a function of the penetration percentage of ‘energy efficient’ loads over the conventional DH network. Key outcomes show the trade-offs between the potential savings in operating costs and the reduction in heat demand: relative losses in this scenario are maintained at 13.1% compared to 15.3% expected with conventional DH; and relative pumping power demand decreased as well. In other words, the costs of supplying heat decrease, even though the total heat supplied is reduced.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 116, no C, 260-272 p.
Keyword [en]
district heating; low-temperature; subnet; energy savings; techno-economic assessment
National Category
Engineering and Technology
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-210802DOI: 10.1016/j.egypro.2017.05.073OAI: oai:DiVA.org:kth-210802DiVA: diva2:1120131
Conference
15th International Symposium on District Heating and Cooling, DHC15-2016, 4-7 September 2016, Seoul, South Korea
Projects
SELECT+
Available from: 2017-07-05 Created: 2017-07-05 Last updated: 2017-07-05

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