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Sjödin, Jörgen
Publications (7 of 7) Show all publications
Sjödin, J. & Henning, D. (2004). Calculating the marginal costs of a district-heating utility. Applied Energy, 78(1)
Open this publication in new window or tab >>Calculating the marginal costs of a district-heating utility
2004 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 78, no 1Article in journal (Refereed) Published
Abstract [en]

District heating plays an important role in the Swedish heat-market. At the same time, the price of district heating varies considerably among different district-heating utilities. A case study is performed here in which a Swedish utility is analysed using three different methods for calculating the marginal costs of heat supply: a manual spreadsheet method, an optimising linear- programming model, and a least-cost dispatch simulation model. Calculated marginal-costs, obtained with the three methods, turn out to be similar. The calculated marginal-costs are also compared to the actual heat tariff in use by the utility. Using prices based on marginal costs should be able to bring about an efficient resource-allocation. It is found that the fixed rate the utility uses today should be replaced by a time-of-use rate, which would give a more accurate signal for customers to change their heat consumptions.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22977 (URN)10.1016/S0306-2619(03)00120-X (DOI)2349 (Local ID)2349 (Archive number)2349 (OAI)
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2017-12-13
Sjödin, J. & Grönkvist, S. (2004). Emissions accounting for use and supply of electricity in the Nordic market. Energy Policy, 32(13), 1555-1564
Open this publication in new window or tab >>Emissions accounting for use and supply of electricity in the Nordic market
2004 (English)In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, Vol. 32, no 13, p. 1555-1564Article in journal (Refereed) Published
Abstract [en]

In the deregulated Nordic electricity market, countries have varying kinds of power generation. In Norway, hydropower generation dominates, while the Swedish electricity production largely consists of equal shares of hydro and nuclear power production. There is a larger share of fossil fuel power generation in Finland and, especially, in Denmark. Cross-border trade between the countries is considerable. Increased use of electricity anywhere in the region may thus entail augmented emissions of greenhouse gases. The amount of increased emissions due to additional electricity usage will depend on the type of generation supplying the additional electricity. Similarly, a decrease in electricity usage may involve reduced greenhouse gas emissions. In this paper, we discuss some different ways to account for changes in greenhouse gas emissions because of a changed use or supply of electricity. A comprehensive accounting scheme should provide an accurate link between various types of energy measures and their related emissions in order to facilitate cost-effective carbon dioxide mitigation procedures.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22934 (URN)10.1016/S0301-4215(03)00129-0 (DOI)2301 (Local ID)2301 (Archive number)2301 (OAI)
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2017-12-13
Gronkvist, S., Sjödin, J. & Westermark, M. (2003). Models for assessing net CO2 emissions applied on district heating technologies. International journal of energy research (Print), 27(6), 601-613
Open this publication in new window or tab >>Models for assessing net CO2 emissions applied on district heating technologies
2003 (English)In: International journal of energy research (Print), ISSN 0363-907X, E-ISSN 1099-114X, Vol. 27, no 6, p. 601-613Article in journal (Refereed) Published
Abstract [en]

Methodologies to assess the effects of energy projects on global carbon dioxide emissions will be an important feature of a future international carbon dioxide trading system. In this paper, we present and discuss four different models for assessing the net carbon dioxide emissions resulting from a certain energy project. These models are applied to different district heating technologies. To judge the mitigation performance of a project, the amount of carbon dioxide released in kilograms is expressed per megawatt-hour of useful district heating produced. All the models consider the marginal change caused by the project on the electric power system. The different model perspectives are discussed, and it is shown that the choice of model is very critical for assessing the net carbon dioxide emissions from an energy project.

Keywords
CO2, Crediting, District heating, Marginal power, Model
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-46641 (URN)10.1002/er.898 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Sundberg, G. & Sjödin, J. (2003). Project financing consequences on cogeneration: Industrial plant and municipal utility co-operation in Sweden. Energy Policy, 31(6), 491-503
Open this publication in new window or tab >>Project financing consequences on cogeneration: Industrial plant and municipal utility co-operation in Sweden
2003 (English)In: Energy Policy, ISSN 0301-4215, E-ISSN 1873-6777, Vol. 31, no 6, p. 491-503Article in journal (Refereed) Published
Abstract [en]

The liberalisation of the European electricity market influences investment decisions in combined heat and power plants. Energy companies modify their business strategies and their criteria for investments in power generation capacity. In this paper, the gains from a co-operation between a paper mill and municipal utility are studied. We find that a widened system boundary, including both the industrial plant and the district heating company, increases cost-effectiveness by 7-11%, compared to a situation with two separately optimised systems. Furthermore, optimal investments are strongly in.uenced by the actors' different required returns. With a relatively low required rate of return on energy investments, typical for a municipally owned utility, the most profitable investment is a wood chips-fuelled cogeneration plant. With a higher rate of return on capital, typical for a competitive industry, the optimal investment is mainly a heat-only steam boiler. Finally, some general influences on required rate of return caused by electricity market deregulation are observed. Whilst tending to increase companies' required returns, deregulation may, besides extending the outlet for locally generated electricity, also obstruct long-termhigh-cost investments such as cogeneration based on conventional technology. © 2002 Published by Elsevier Science Ltd.

Keywords
Cogeneration, District heating, Optimisation
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-46653 (URN)10.1016/S0301-4215(02)00074-5 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Sjödin, J. (2002). Modelling the impact of energy taxation. International journal of energy research (Print), 26(6), 475-494
Open this publication in new window or tab >>Modelling the impact of energy taxation
2002 (English)In: International journal of energy research (Print), ISSN 0363-907X, E-ISSN 1099-114X, Vol. 26, no 6, p. 475-494Article in journal (Refereed) Published
Abstract [en]

Energy taxation in Sweden is complicated and strongly guides and governs district energy production. Consequently, there is a need for methods for accurate calculation and analysis of effects that different energy tax schemes may have on district energy utilities. Here, a practicable method to analyse influence of such governmental policy measures is demonstrated. The Swedish Government has for some years now been working on a reform of energy taxation, and during this process, several interest groups have expressed their own proposals for improving and developing the system of energy taxation. Together with the present system of taxation, four new alternatives, including the proposed directive of the European Commission, are outlined in the paper. In a case study, an analysis is made of how the different tax alternatives may influence the choice of profitable investments and use of energy carriers in a medium-sized district-heating utility. The calculations are made with a linear-programming model framework. By calculating suitable types and sizes of new investments, if any, and the operation of existing and potential plants, total energy costs are minimized. Results of the analysis include the most profitable investments, which fuel should be used, roughly when during a year plants should be in operation, and at what output. In most scenarios, the most profitable measure is to invest in a waste incineration plant. However, a crucial assumption is, with reference to the new Swedish waste disposal act, a significant income from incinerating refuse. Without this income, different tax schemes result in different technical solutions being most profitable. An investment in cogeneration seems possible in only one scenario. It is also found that particular features of some alternatives seem to oppose both main governmental policy goals, and intentions of the district heating company. Copyright (C) 2002 John Wiley Sons, Ltd.

Keywords
energy taxation, district heating, cogeneration, optimization
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-47882 (URN)10.1002/er.797 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Wren, J., Karlsson, M., Loyd, D., Sjödin, J. & Erlandsson, B.-E. (2000). A Heat Transfer Analysis of Microwave Thermal Therapy of the Prostate. In: Annual International Conference of the IEEE Engineering in Medicine biology Society,2000.
Open this publication in new window or tab >>A Heat Transfer Analysis of Microwave Thermal Therapy of the Prostate
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2000 (English)In: Annual International Conference of the IEEE Engineering in Medicine biology Society,2000, 2000Conference paper, Published paper (Other academic)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-35261 (URN)26019 (Local ID)26019 (Archive number)26019 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2016-03-14
Palm, J., Gyberg, P., Sjödin, J. & Wahlund, B. (1999). Borlänges energisystem - påverkan och förändring. Linköping: Program Energisystem
Open this publication in new window or tab >>Borlänges energisystem - påverkan och förändring
1999 (English)Report (Other academic)
Place, publisher, year, edition, pages
Linköping: Program Energisystem, 1999
Series
Arbetsnotat / Program Energisystem, ISSN 1403-8307 ; 3
Keywords
energi, kommun, Borlänge, system, makt, handlingsutrymme
National Category
Social Sciences Interdisciplinary Other Social Sciences not elsewhere specified
Identifiers
urn:nbn:se:liu:diva-24411 (URN)6514 (Local ID)6514 (Archive number)6514 (OAI)
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2018-01-13
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