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Investigating influential techno-economic factors for combined heat and power production using optimization and metamodeling
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.ORCID iD: 0000-0001-5574-8372
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.ORCID iD: 0000-0003-3472-4210
2018 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 232, p. 555-571Article in journal (Refereed) Published
Abstract [en]

This paper investigates the interaction of a wide range of electricity and fuel prices and technical factors of combined heat and power production in a district heating system. A linear programming-based optimization model with the objective to minimize system cost was used to study the energy systems in the cities of Gävle and Sandviken in Sweden. The comprehensive outcomes from optimization and parametric studies have been analyzed using a polynomial-based metamodel. System costs include variable costs for the production and revenues for sale of heat and electricity. The metamodel is used as an analytical and explanatory tool to interpret input-output relationships. Municipal district heating systems of Gävle and Sandviken in Sweden are studied as an interconnected regional system with improved and new combined heat and power plants. The results show that effects from electricity and fuel prices are important, but that variations in energy system cost may also be caused by many cross-factor interactions with technical factors. A comparative system performance analysis with defined cases and optimal factor setting shows a substantial increase in the electricity production, here by up to 650 GWh annually. The profitability of investing in a new plant depends highly on the considered investment risk and electricity and fuel market prices. CO2 emission savings by up to 466 kton annually can be accomplished if marginal electricity production from coal-condensing power plants is avoided and biofuel is released at the same time.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 232, p. 555-571
Keywords [en]
Metamodel; Optimization; Energy system cost; Sensitivity analysis; Cogeneration; District heating
National Category
Energy Systems
Research subject
Sustainable Urban Development
Identifiers
URN: urn:nbn:se:hig:diva-28141DOI: 10.1016/j.apenergy.2018.09.206ISI: 000451356200040Scopus ID: 2-s2.0-85054461705OAI: oai:DiVA.org:hig-28141DiVA, id: diva2:1254699
Available from: 2018-10-10 Created: 2018-10-10 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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Weinberger, GottfriedMoshfegh, Bahram

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