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Economic benefits of fourth generation district heating
Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).ORCID iD: 0000-0003-2885-0923
Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).ORCID iD: 0000-0001-9069-0807
2020 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 193, article id 116727Article in journal (Refereed) Published
Abstract [en]

The main impetus for lower distribution temperatures in district heating systems is the lower heat supply costs obtained by these lower temperatures. In this paper, the differences in heat supply costs for two different temperature levels have been estimated for various future heat supply options. The estimations were obtained by modelling a district heating system characterised by typical climate conditions for Central Europe. High sensitivity to lower supply costs from lower temperatures was found for geothermal heat, industrial excess heat, and heat pumps, whereas low cost sensitivity was estimated for combined heat and power plants using waste or biomass. Lower heat distribution loss constitutes a minor component of the total cost reductions. The current use of high heat distribution temperatures was identified as an important barrier for the transition to renewable and recycled heat supply in district heating systems. Hence, lower distribution temperatures would facilitate this required transition because lower distribution temperatures provide higher profitability for these renewable and recycled heat sources. © 2019 The Authors. Published by Elsevier Ltd.

Place, publisher, year, edition, pages
London, UK: Elsevier, 2020. Vol. 193, article id 116727
Keywords [en]
Low temperature, district heating, cost reduction gradients, 4GDH, economic motivation
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:hh:diva-41287DOI: 10.1016/j.energy.2019.116727Scopus ID: 2-s2.0-85076847499OAI: oai:DiVA.org:hh-41287DiVA, id: diva2:1381113
Funder
EU, Horizon 2020, 768936
Note

Other funding: International Energy Agency Technology Collaboration Programme on District Heating and Cooling including Combined Heat and Power, IEA-DHC|CHP Annex TS2 Implementation of low-temperature district heating systems.

Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2020-02-25Bibliographically approved
In thesis
1. Low-temperature District Heating: Various Aspects of Fourth-generation Systems
Open this publication in new window or tab >>Low-temperature District Heating: Various Aspects of Fourth-generation Systems
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

With decreasing heat demand and less availability of high-temperature heat supply in future energy systems, the current district heating systems may experience increased competition on the heat market. A viable option to mitigate increasing competition is to operate systems with lower temperature levels, and the most conceivable way to achieve lower temperature levels is to decrease return temperatures.In this thesis, aspects of improvements in district heating systems are assessed. Three aspects, in particular, have been analysed. These are integration between energy systems, improvements in heat distribution technology, and economic benefits of low-temperature district heating systems.An increasing interest in integrating different energy systems has been prompted by the rapid introduction of intermittent renewable electricity supply in the energy system. Large-scale conversion of power to heat in electric boilers and heat pumps is a feasible alternative to achieve the balancing capacities required to maintain system functioning. Analysis of the unique Swedish experience using large heat-pump installations connected to district heating systems shows that, since the 1980s, 1527 MW of heat power has been installed, and about 80% of the capacity was still in use in 2013. Thus, a cumulative value of over three decades of operation and maintenance exists within Swedish district heating systems.Increased competition prompted by changes in the operation environment necessitates improved heat distribution. This thesis focuses on three system-embedded temperature errors: first, the temperature error that occurs due to recirculation in distribution networks at low heat demands; second, the temperature error that occurs due to hot-water circulation in multi-family buildings; third, the temperature error that occurs due to lower heat transfer than is possible in heat exchangers (i.e. too-short thermal length). To address these temperature errors, three technology changes have been proposed (i) a three-pipe distribution network to separate the recirculation return flow from the delivery return flow, (ii) apartment substations to eliminate hot-water circulation use, and (iii) improved heat exchangers for lower return temperatures. The analysis of the proposed changes indicates annual average return temperatures between 17°C and 21°C.The final analysed aspect is the economic benefits of low-temperature district heating. It was identified that strong economic motives for lower operating temperatures in future heat supply exist, whereas the economic motives are significantly weaker for the traditional heat supply.The five papers presented in this thesis are related to future district heating systems through the five abilities of fourth-generation district heating (4GDH), which are documented in the definition paper on 4GDH.

Place, publisher, year, edition, pages
Lund: Lund University, 2019. p. 31
Keywords
District heating, low temperature, three-pipe systems, 4GDH-3P
National Category
Energy Engineering
Identifiers
urn:nbn:se:hh:diva-41080 (URN)978-91-7895-316-5 (ISBN)978-91-7895-317-2 (ISBN)
Public defence
2019-12-11, M:B, M-huset, Ole Römers väg 1, Lund, 13:15 (English)
Opponent
Supervisors
Note

ISRN: LUTMDN/TMHP-19/1153-SE. I publikationen felaktigt: ISSN 0282-1990

Available from: 2020-02-18 Created: 2019-12-03 Last updated: 2020-02-18

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Averfalk, HelgeWerner, Sven

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