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Weinberger, GottfriedORCID iD iconorcid.org/0000-0001-5574-8372
Publications (3 of 3) Show all publications
Amiri, S. & Weinberger, G. (2018). Increased cogeneration of renewable electricity through energy cooperation in a Swedish district heating system - A case study. Renewable energy, 116, 866-877
Open this publication in new window or tab >>Increased cogeneration of renewable electricity through energy cooperation in a Swedish district heating system - A case study
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.

Keywords
Renewable electricity; Biofuel; Energy cooperation; District heating; CHP; CO2 emission
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-25460 (URN)10.1016/j.renene.2017.10.003 (DOI)000416188200077 ()2-s2.0-85031893536 (Scopus ID)
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: 2018-03-13Bibliographically approved
Weinberger, G. & Moshfegh, B. (2018). Investigating influential techno-economic factors for combined heat and power production using optimization and metamodeling. Applied Energy, 232, 555-571
Open this publication in new window or tab >>Investigating influential techno-economic factors for combined heat and power production using optimization and metamodeling
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
Keywords
Metamodel; Optimization; Energy system cost; Sensitivity analysis; Cogeneration; District heating
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-28141 (URN)10.1016/j.apenergy.2018.09.206 (DOI)000451356200040 ()2-s2.0-85054461705 (Scopus ID)
Available from: 2018-10-10 Created: 2018-10-10 Last updated: 2019-01-07Bibliographically approved
Weinberger, G., Amiri, S. & Moshfegh, B. (2017). On the benefit of integration of a district heating system with industrial excess heat: an economic and environmental analysis. Applied Energy, 191, 454-468
Open this publication in new window or tab >>On the benefit of integration of a district heating system with industrial excess heat: an economic and environmental analysis
2017 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 191, p. 454-468Article in journal (Refereed) Published
Abstract [en]

Energy-related cooperation using industrial excess heat (IEH) in district heating (DH) networks shows economic and environmental benefits. A rarely investigated approach is the energy cooperation which incorporates a jointly operated CHP plant also producing process steam for nearby industry. The present study aims to evaluate economic and environmental effects on the Hofors DH system with jointly operated CHP plant when the nearby steel mill extends the supply of recovered IEH. Various IEH supply opportunities with different capacities of hot water and steam were designed and compared with existing IEH utilization, plant heat and electricity production and DH system performance. The energy system model MODEST is used for cost-optimization. A parametric study is used to analyze influences of increasing IEH cost and fluctuating electricity prices. The results show advantages for the DH system to utilize IEH for deliveries of DH and process steam and the cogeneration of electricity. Economic and environmental benefits are decreased total system cost (-1.67 MEUR/a), less use of fuels and electricity, and reduced CO2 emissions with a maximal reachable amount of 28,200 ton/a when the use of biofuel is assumed as limited resource and the substituted marginal electricity production is based on coal condensing power plants. The results also show that industrial steam is a preferred heat supply source as long as the steam cost is below the alternative heat production cost, irrespective of the electricity price. While the cost-effective utilization of industrial hot water for DH is more sensitive and affected by a beneficial CHP production based on higher electricity price segments, it is also shown that utilization of continuously supplied industrial hot water is limited during seasons of low DH demand.

Keywords
CHP, MODEST, Marginal electricity, System cost, Energy use, CO2 emission
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-23746 (URN)10.1016/j.apenergy.2017.01.093 (DOI)000395963500036 ()2-s2.0-85012164014 (Scopus ID)
Projects
Ett nytt kylningskoncept för att ta till vara industriellt överskottsvärme från heta kroppar; HIG-FORSK 2012/66
Funder
Swedish Energy Agency
Note

The work has been carried out as part of a project with a new cooling concept in the steel industry, which was financed by the Swedish Energy Agency, the companies Varmevarden AB (Hofors Energi AB), Ovako AB and the Clean Production Center. All companies and participants are greatly acknowledged for their support and contributions.

Available from: 2017-03-14 Created: 2017-03-14 Last updated: 2018-03-13Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-5574-8372

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