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Increased cogeneration of renewable electricity through energy cooperation in a Swedish district heating system - A case study
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system. Department of Management and Engineering, Division of Energy Systems, Linköping University, Linköping, Sweden.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.ORCID iD: 0000-0001-5574-8372
2018 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 116, p. 866-877Article in journal (Refereed) Published
Abstract [en]

The present study of the district heating (DH) system in the city of Kisa, Sweden, shows how, through energy cooperation with a nearby sawmill and paper mill, a local energy company contributes to energy-efficient DH and cost-effective utilization of a new biofuel combined heat and power (CHP) plant. Cases of stand-alone and integrated energy systems are optimized with the linear program MODEST. The European power market is assumed to be fully deregulated. The results show clear advantages for the energy company to cooperate with these industries to produce heat for DH and process steam for industry. The cooperating industries gain advantages from heat and/or biofuel by-product supply as well. The opening to use a biofuel CHP plant for combined heat supply results in cogenerated electricity of almost 29 GWh/a with an increased biofuel use of 13 GWh/a, zero fuel oil use and CO2 emission reductions of 25,800 tons CO2/a with coal-condensing power plant on the margin and biofuel as limited resource. The total system cost decreases by −2.18 MEUR/a through extended cooperation and renewable electricity sales. The sensitivity analysis shows that the profitability of investing in a biofuel CHP plant increases with higher electricity and electricity certificate prices.

Place, publisher, year, edition, pages
2018. Vol. 116, p. 866-877
Keywords [en]
Renewable electricity; Biofuel; Energy cooperation; District heating; CHP; CO2 emission
National Category
Energy Systems
Research subject
Sustainable Urban Development
Identifiers
URN: urn:nbn:se:hig:diva-25460DOI: 10.1016/j.renene.2017.10.003ISI: 000416188200077Scopus ID: 2-s2.0-85031893536OAI: oai:DiVA.org:hig-25460DiVA, id: diva2:1152565
Projects
A project for development of Sustainable Clean Wood Energy in the Central Baltic region
Note

Funding agencies:

Östergötland County Administrative Board  grant no. 304-1677-2012

Linköping University  

University of Gävle  

Available from: 2017-10-25 Created: 2017-10-25 Last updated: 2023-04-03Bibliographically approved
In thesis
1. Energy System Collaboration as a Vital Measure to Improve District Heating Performance
Open this publication in new window or tab >>Energy System Collaboration as a Vital Measure to Improve District Heating Performance
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

With joint commitments by twenty-seven countries under the Paris Agreement, the European Union envisioned a resource-efficient and competitive economy without net emission of greenhouse gases by 2050. Immediate and massive efforts across sectors of energy, industry, and buildings will be required, and district heating (DH), through its ability to integrate efficiency measures on the supply and demand side, can play a central role. The aim of this thesis is to investigate techno-economic effects and environmental impacts of different energy system collaborations (ESCOs) with efficiency measures and their ability to improve DH performance. ESCOs studied in Sweden involve various actors and utilize more industrial excess heat (IEH) or new combined heat and power (CHP) plants and provide energy renovation of multi-story apartment building clusters. Results show benefits from lower use of fuels and electricity when utilizing new supplied IEH in a DH system. Systems integration and new CHP plant in another ESCO study show advantages in cogeneration of electricity (29 GWh/a) and industry fuel supply. A new combined-cycle CHP plant in yet another study with systems integration shows benefits with increased electricity production (650 GWh/a), but is also highly dependent on considered investment risk and energy prices. Findings from cluster energy renovation show reduced primary energy use (36.2 GWh/a) and carbon dioxide emissions (8.4 kton CO2/a) mainly from biofuels substituting for fossil fuels in power plants but also decreased CHP production (35.7 GWh/a heat; 6.5 GWh/a electricity) and financial deficit for building owners, energy companies, and industries (44, 33.9, and 2.2 M€/50a respectively). This work proposes methods and approaches (e.g., optimization, simulation, metamodeling) that have the ability to investigate implications from ESCOs with efficiency measures and to quantify changes in system cost, energy resource use, and CO2 emissions.

 

Abstract [sv]

Den Europeiska Unionen eftersträvar i enlighet med Parisavtalet att bli en resurseffektiv och konkurrenskraftig ekonomi utan nettoutsläpp av växthusgaser till 2050. Omedelbara och massiva insatser kommer att krävas inom sektorerna energi, industri och byggnader. Fjärrvärme med möjlighet att integrera effektiviseringsåtgärder på tillförsel- och efterfrågesidan kan spela en central roll. Syftet med denna avhandling är att undersöka tekniska och ekonomiska effekter, samt miljöpåverkan av energisystemsamverkan (ESCOs) med effektiviseringsåtgärder och dessas möjlighet att förbättra fjärrvärmeprestanda. ESCOs studier i Sverige involverar olika samverkande aktörer och utnyttjar industriell överskottsvärme och nya kraftvärmeverk och de energirenoverar även kluster av flervåningshus. Resultaten visar fördelar med minskad användning av bränsle och elektricitet genom nytillförd industriell överskottsvärme i fjärrvärmesystem. Systemintegration och ett nytt kraftvärmeverk i en annan ESCO-studie visar fördelar med ökad elproduktion (29 GWh/år) och bränsleförsörjning från industrier. Ett nytt kombikraftvärmeverk i en annan studie med systemintegration visar fördelar med ökad elproduktion (650 GWh/år), men även ett starkt beroende av övervägd investeringsrisk samt ändrade energipriser. Resultaten från energirenoveringar av byggnadskluster visar minskad primärenergianvändning (36,2 GWh/år) och koldioxidutsläpp (8,4 kton/år) främst från biobränslen som ersätter fossila bränslen i kraftverk, men även en reducerad kraftvärmeproduktion (35,7 GWh/år värme; 6,5 GWh/år el) och ett ekonomiskt underskott för fastighetsägare, energiföretag och industrier (44, 33,9 respektive 2,2 M€/50 år). Denna avhandling föreslår metoder och tillvägagångssätt såsom optimering, simulering och metamodellering för att undersöka implikationer från ESCOs med effektiviseringsåtgärder, samt kvantifierade förändringar av systemkostnader, energiresursanvändning och koldioxidemissioner.

Place, publisher, year, edition, pages
Gävle: Gävle University Press, 2023. p. 112
Series
Doctoral thesis ; 35
Keywords
Energy system collaboration, District heating, Industrial excess heat, Combined heat and power, Energy system optimization, Metamodeling, Building LCC optimization, Building energy simulation, Cluster energy renovation, Energisystemsamverkan, Fjärrvärme, Industriell överskottsvärme, Kraftvärme, Energisystemoptimering, Metamodellering, Byggnads-LCC-optimering, Byggnadsenergisimulering, Klusterenergirenovering
National Category
Energy Systems Energy Engineering
Research subject
Sustainable Urban Development
Identifiers
urn:nbn:se:hig:diva-41214 (URN)978-91-89593-04-6 (ISBN)978-91-89593-05-3 (ISBN)
Public defence
2023-06-12, 12:108 Lilla Jadwigasalen, Högskolan i Gävle, Kungsbäcksvägen 47, Gävle, 10:00 (English)
Opponent
Supervisors
Available from: 2023-05-22 Created: 2023-04-03 Last updated: 2023-05-22

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Amiri, ShahnazWeinberger, Gottfried

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