23 results on '"Djuric Ilic, Danica"'
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2. Using flexible energy system interactions amongst industry, district heating, and the power sector to increase renewable energy penetration
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Cruz, Igor, Djuric Ilic, Danica, Johansson, Maria, Cruz, Igor, Djuric Ilic, Danica, and Johansson, Maria
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Swedens goal of 100% renewable electricity generation by 2040 requires investments in intermittent electricity production (e.g. wind power). However, increasing the share of intermittent electricity production presents challenges, including reduced flexibility of electricity production. A strategy for overcoming this issue is developing flexibility in electricity consumption. This study analyses the potential for using flexible industrial processes, heat pumps (HP), and combined heat and power (CHP) plants in Swedish district heating systems to increase the share of wind power capacity without compromising grid stability. The simulation tool EnergyPLAN was used to assess the potential contribution of these strategies. The analysis includes a range of annual wind power production between 45 and 60 TWh. The required electricity imports and critical excess electricity (that can neither be used nor exported due to transmission line limitations) were used to evaluate the systems stability. Managing the operation of CHP plants, HPs, and industrial processes in a flexible way is challenging, but these strategies may still play a decisive role in increasing the share of renewable electricity production and reducing demand peaks in cities. Whilst HP regulation is better at reducing excess electricity production at lower wind power capacities (from 32 to 15% for the analysed interval of wind power production), CHP regulation becomes more relevant when wind power capacity increases (from 14 to 39%). Like HP regulation, flexibility in electricity demand in industrial processes had a greater percentage contribution at lower wind power capacities. Combining HP, CHP regulation, and flexible electricity demands in industry can reduce excess electricity production by 68-80% and electricity imports by 14-26%. Wind power contributing to grid stabilisation reduces excess electricity production but does not reduce electricity imports.
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- 2023
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3. Towards a Sustainable Future: A Review of Heating and Cooling Solutions
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Djuric Ilic, Danica, Ödlund, Louise, Johansson, Maria, Djuric Ilic, Danica, Ödlund, Louise, and Johansson, Maria
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- 2023
4. Sustainable Business Strategies for District Heating
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Ödlund, Louise, Djuric Ilic, Danica, Ödlund, Louise, and Djuric Ilic, Danica
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The European Commission has been recognized DH technology of essential importance to reach the sustainability. A flexibility in the fuel mix, and possibilities of industrial waste heat utilization, combined heat and power (CHP) production and energy recovery through waste incineration, are only some of the benefits which characterize DH technology. The aim of this study is to provide an overview of the possible business strategies which would enable for DH to have an important role towards future sustainable energy systems. The study includes a system approach where DH is seen as a part of an integrated system which consists of transport‑, industrial-, and electricity sectors as well. Converting energy for running the industrial processes from fossil fuels and electricity to DH and delivering excess heat from industrial processes, would make the industry less dependent on fossil fuels and fossil fuel-based electricity, as well as increase energy efficiency and reduce production costs. Reducing the electricity use in the industry sector while at the same time increasing the CHP production in the local DH systems would (1) replace fossil-based electricity production with electricity in biomass- or waste-fueled CHP plants, and reduce the capacity requirements from the national electricity grid (i.e. it would reduce the pressure on the bottle necks in the grid). Furthermore, by operating their central controlled heat pumps and CHP plants depending on the intermittent electricity production variation the DH companies may enable an increased share of intermittent electricity production in the national electricity grid.
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- 2023
5. Towards Sustainable Energy Systems in a Backcasting Perspective
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Ödlund, Louise, Johansson, Maria, Djuric Ilic, Danica, Ödlund, Louise, Johansson, Maria, and Djuric Ilic, Danica
- Published
- 2023
6. Economic and environmental benefits of converting industrial processes to district heating
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Djuric Ilic, Danica and Trygg, Louise
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- 2014
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7. Integration of biofuel production into district heating – part I: an evaluation of biofuel production costs using four types of biofuel production plants as case studies
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Djuric Ilic, Danica, Dotzauer, Erik, Trygg, Louise, and Broman, Göran
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- 2014
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8. Integration of biofuel production into district heating – Part II: an evaluation of the district heating production costs using Stockholm as a case study
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Djuric Ilic, Danica, Dotzauer, Erik, Trygg, Louise, and Broman, Göran
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- 2014
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9. Introduction of large-scale biofuel production in a district heating system – an opportunity for reduction of global greenhouse gas emissions
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Djuric Ilic, Danica, Dotzauer, Erik, Trygg, Louise, and Broman, Göran
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- 2014
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10. Classification of Measures for Dealing with District Heating Load Variations-A Systematic Review
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Djuric Ilic, Danica
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Energiteknik ,district heating ,load management ,demand side measures ,demand response ,Energy Engineering - Abstract
The highly varying character of district heating (DH) demand results in low capacity utilization of the DH plants, as well as increased use of fossil fuels during peak demand. The aim of this study is to present an overview and a comprehensive classification of measures intended to manage these load variations. A systematic literature review was conducted based on previously defined search strings as well as inclusion and exclusion criteria. Two scientific databases were used as data sources. Based on 96 detected publications, the measures were categorized as (1) complementing DH production in heat-only boilers (HOBs), or geothermal or booster heat pumps (HPs) (usually controlled by the DH company), (2) thermal energy (TE) storage in storage units or in the network (controlled by the company), and (3) demand side measures, which can be strategic demand increase, direct demand response (DR), or indirect DR. While the company has control over direct DR (e.g., thermal storage in the thermal mass of the buildings), indirect DR is based on communication between the customer and the company, where the customer has complete control. The multi-disciplinary nature of this topic requires an interdisciplinary approach.
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- 2021
11. No zero burden assumption in a circular economy
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Djuric Ilic, Danica, Eriksson, Ola, Ödlund, Louise, Åberg, Magnus, Djuric Ilic, Danica, Eriksson, Ola, Ödlund, Louise, and Åberg, Magnus
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A majority of previous studies on environmental problems caused by waste generation have focused on waste disposal issues without fully highlighting the primary reasons behind the problems. As a consequence, efforts to reduce these problems are usually directed towards the stakeholders that provide waste treatment and disposal instead of the stakeholders that contribute to waste generation. In order to detect connections between different problems of sustainability and to suggest measures which may contribute to their solutions, this study provides a simplified overview of the mechanisms behind waste generation and management. The results from the study show that the only way to eliminate problems of sustainability is to apply an upstream approach by dealing with the primary problems which occur in the early stages of the system (e.g. overconsumption of products, as well as use of finite resources, toxic materials, and non-recyclable materials). By dealing with these problems, the emergence of secondary problems would be prevented. Thereby, stakeholders who have the highest possibility to contribute to the sustainable development of the waste generation and management are the stakeholders from the origin of the products life cycles, such as product developers, manufacturing companies, product users and policy makers. Different trade-off situations such as contradictions between economics, recyclability, energy efficiency, make it even harder to deal with issues of sustainability related to the system and to detect the stakeholders who may contribute to the development. One of the main conclusions from this study is that when transforming society towards a circular economy, the traditional view of separate systems for production and waste management must be changed. In order to refer to all problems of sustainability and also cover the top steps of the waste hierarchy, life cycle assessment of waste management should include manufacture and use of products ending up, Funding Agencies|Swedish Energy Company: Tekniska Verken; Swedish Energy Company: Goteborg Energi
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- 2018
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12. Method for allocation of carbon dioxide emissions from waste incineration which includes energy recovery
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Djuric Ilic, Danica, Ödlund, Louise, Djuric Ilic, Danica, and Ödlund, Louise
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Presently, waste is regarded as any other fuel in the Swedish district heating (DH) plants where it is treated in combination with energy recovery. Consequently, all carbon dioxide (CO2) emissions that occur during waste treatment are allocated to DH producers even though two simultaneous services are provided - waste treatment and energy recovery. As the focus today is on phasing out fossil fuels from Swedish DH sector, energy recovery from waste turns out to be less desirable than heat production using biofuel and renewable electricity. This article discusses whether the existing allocation method of CO2 emissions contributes to sustainable development and if it does not, to recommend a new method that will. To do this type of assessment, we used the principles from Framework for Strategic Sustainable Development. Results showed that the existing allocation method does not consider the problem of waste generation. The method shifts the responsibility from waste producers to DH customers. To prevent this burden shifting, a broader system perspective and an upstream approach should be applied. In addition, the method should be designed in ways that would give incentives to responsible stakeholders to act properly, which requires identifying the reasons why waste is not being recycled and to find a way to apply the allocation. Considering resource efficiency, waste treatment through combustion should always include energy recovery. To encourage energy recovery, the produced heat should not be burdened with CO2 emissions. (C) 2018 The Authors. Published by Elsevier Ltd., Funding Agencies|Goteborg Energi, Goterborg, Sweden; Tekniska Verken, Linkoping, Sweden
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- 2018
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13. Review of sustainable development of the road transport sector : Are there geographical differences?
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Johansson, Maria, Djuric Ilic, Danica, Johansson, Maria, and Djuric Ilic, Danica
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Even though the share of renewable energy in the transport sector has increased during the last decade, the sector is still highly dependent on fossil fuels. Consequences are for example emissions of greenhouse gases, particulates, carbon monoxide and nitrogen oxides. This is of great concern for the environment, climate change, and human health. This study reviews scientific publications about sustainable development of the road transport sector, published 2005-2018. The aim of the study is to investigate if there are differences in the measures and strategies presented in the publications depending on the geographical areas studied, and to analyse if there are differences depending on year of publication. The authors analysed to what extent local conditions influence the choice of proposed measures and strategies. A system perspective was applied in order to include measures related to the whole life cycle of the road transport, as well as other sectors, which influence or are influenced by the transport sector. A literature review was performed using the search-engine Web of Science. Results show that important local conditions that may influence the research focus within the area of sustainable development of the road transport sector are for example: energy supply security (e.g. availability of biomass and renewable electricity, as well as access to domestic fossil fuel resources), possibilities for developing infrastructure for biofuel supply and charging of electric vehicles, political priorities and approaches, and traditions.
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- 2018
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14. Corporate greenhouse gas inventories, guarantees of origin and combined heat and power production - Analysis of impacts on total carbon dioxide emissions
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Nordenstam, Lena, Djuric Ilic, Danica, Ödlund, Louise, Nordenstam, Lena, Djuric Ilic, Danica, and Ödlund, Louise
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The Greenhouse Gas Protocol Corporate Accounting and Reporting Standard (Corporate Standard) and the EU frameworks of guarantees of origin (GO) and emissions disclosure of energy carriers are intended to inform decision -making and reduce GHG emissions. This study analyses how decisions on purchases of electricity and district heating and decisions on combined heat and power (CHP) production are incentivised by the Corporate Standard and EU frameworks. It also analyses how the EU frameworks relate to CO2 emissions reductions through CHP production. Using a consequential CO2 assessment method for comparison, the study shows that purchasing decisions supported by the Corporate Standard or the GO scheme can increase total CO2 emissions. It also shows that the Corporate Standard and EU frameworks can counteract CHP production and its contribution to CO2 emissions reduction. We recommend that consequential GHG assessment methods be used for emissions reduction decisions, including when designing policy instruments aimed at emissions reduction. (C) 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license., Funding Agencies|Tekniska verken i Linkoping AB
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- 2018
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15. Corporate greenhouse gas inventories, guarantees of origin and combined heat and power production – Analysis of impacts on total carbon dioxide emissions
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Nordenstam, Lena, primary, Djuric Ilic, Danica, additional, and Ödlund, Louise, additional
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- 2018
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16. No zero burden assumption in a circular economy
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Djuric Ilic, Danica, primary, Eriksson, Ola, additional, Ödlund (former Trygg), Louise, additional, and Åberg, Magnus, additional
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- 2018
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17. Socioeconomic potential for introducing large-scale heat pumps in district heating in Denmark
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Lund, Rasmus, Djuric Ilic, Danica, Trygg, Louise, Lund, Rasmus, Djuric Ilic, Danica, and Trygg, Louise
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Denmark has a national political goal of a 100% renewable energy supply in 2050. This requires a comprehensive transition of the energy system. For some decades, district heating in Denmark has been contributing to high fuel efficiency as well as to the integration of the electricity and heating sectors. Large-scale compression heat pumps would improve the integration between the district heating and power sectors by utilising the fluctuations in the supply from wind power, solar photo voltaic and other sources. Previous studies indicate that the introduction of heat pumps in Denmark will have a positive impact on the total costs for energy supply in the transition towards 100% renewable energy. In this paper, this is further investigated to assess the feasibility of heat pumps in the Danish energy system. The assessment is made by applying two different energy system analysis tools, named EnergyPLAN and MODEST. The comparison and discussion of these tools is a secondary purpose of the study. In general, the results show a potential for introducing heat pumps in Denmark between 2 and 4 GW-thermal power and a total potential benefit around 100 M(sic)/year in 2025. (C) 2016 Elsevier Ltd. All rights reserved., Funding Agencies|Innovation Fund Denmark [0603-00498B]
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- 2016
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18. With district heating toward a sustainable future : System studies of district heating and cooling that interact with power, transport and industrial sectors
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Djuric Ilic, Danica
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Teknik och teknologier ,Engineering and Technology - Abstract
The aim of this thesis is to identify measures which should be taken in DH systems (DHSs) in order to contribute to the development of the DHSs and other energy systems (especially transport, industrial and power sectors) toward sustainability. Four business strategies were analysed: delivering excess heat from biofuel production industry to DHSs, conversion of industrial processes to DH, integration of biofuel production in DHSs and integration of DHdriven absorption cooling technology in DHSs. Delivering excess heat from biofuel production industry to DHSs was analysed with a focus on the biofuel production costs for four biofuel production technologies. Integration of biofuel production and integration of DH-driven absorption cooling technology in DHSs were analysed with a focus on Stockholm’s DHS, using an optimisation model framework called MODEST. When the conversion of industrial processes to DH was analysed, DHSs and industrial companies in Västra Götaland, Östergötland and Jönköping counties were used as case studies; a method for heat load analysis called MeHLA was used to analyse the effects on the local DHSs. The results showed that when considering biomass an unlimited resource, by applying the abovementioned business strategies DH has a potential to reduce global fossil fuel consumption and global GHG emissions associated with power, industrial and transport sectors. DH producers may contribute to the sustainable development of the transport sector by buying excess heat from the biofuel production industry. This business strategy results in lower biofuel production costs, which promotes development of biofuel production technologies that are not yet commercial. Moreover, introduction of large-scale biofuel production into local DHSs enables development of local biofuel supply chains; this may facilitate the introduction of biofuel in the local transport sectors and subsequently decrease gasoline and fossil diesel use. Conversion of industrial processes from fossil fuels and electricity to DH is a business strategy which would make the industry less dependent on fossil fuels and fossil fuelbased electricity. DH may also contribute to the sustainable development of the industry by buying waste heat from industrial processes, since this strategy increases the total energy efficiency of the industrial processes and reduces production costs. Furthermore, DH has a possibility to reduce fossil fuel consumption and subsequently GHG emissions in the power sector by producing electricity in biomass- or waste-fuelled CHP plants. When the marginal electricity is associated with high GHG emissions (e.g. when it is produced in coal-fired condensing power (CCP)) plants, the reduction of the marginal electricity production (due to the conversion of industrial processes from electricity to DH and due to the conversion of compression cooling to DHdriven absorption cooling) results in higher environmental benefits. On the other hand, the introduction of biofuel production into DHSs becomes less attractive from an environmental viewpoint, because the investments in biofuel production instead of in CHP production lead to lower electricity production in the DHSs. The increased DH use in industry and introduction of the biofuel production and DH-driven absorption cooling production into the DHSs lead to increased biomass use in the DHSs. Because of this, if biomass is considered a limited resource, the environmental benefits of applying these business strategies are lower or non-existent. Syftet med denna avhandling är att identifiera åtgärder som bör vidtas i FJV-system (FJVS) för att bidra till en hållbar utveckling av FJV och andra relaterade energisystem som transport, industri- och energisektorn. Fyra affärsstrategier är analyserade: att leverera överskottsvärme från produktion av biobränsle för transportsektorn, konvertering av industriella processer till FJV, integration av biobränsleproduktion för transportsektorn i FJVS och integration av FJV-driven absorptionskylteknik i FJVS. Att leverera överskottsvärme från produktion av biobränsle till transportsektorn analyserades med fokus på kostnader för fyra olika produktionstekniker. Integration av biobränsleproduktion till transportsektorn och integration av FJV-driven absorptionskylteknik i FJVS analyserades på Stockholms FJVS med optimeringsmodellen MODEST. När konvertering av industriella processer till FJV analyserades, användes FJVS och industriföretag i Västra Götaland, Östergötlands och Jönköpings län som fallstudier. Metoden MeHLA som används för analys av värmebelastning tillämpades för att analysera effekterna på de lokala FJVS. Resultaten från studierna visar att när biomassa anses vara en obegränsad resurs har FJV en potential att minska den globala konsumtionen av fossila bränslen och de globala utsläppen av växthusgaser som förknippas med transport-, industri- och energisektorn, for samtliga analyserade affärsstrategierna. FJV producenter kan bidra till en hållbar utveckling av transportsektorn genom användningen av överskottsvärme från produktion av transportbiobränsle. Den analyserade affärsstrategin ger lägre produktionskostnader för transportbiobränsle vilket främjar utvecklingen av produktionsteknik som ännu inte är kommersiell. Dessutom möjliggörs utveckling av lokala försörjningskedjor av transportbiobränsle på grund av den storskaliga produktionen av transportbiobränsle i lokala FJVS. Detta kan sedan underlätta införandet av transportbiobränsle i lokala transporter och även minska användningen av bensin och fossil diesel. Konvertering av industriella processer från fossila bränslen och el till FJV är en affärsstrategi som skulle göra FJV-branschen mindre beroende av fossila bränslen. Att använda spillvärme från industriprocesser ökar den totala energieffektiviteten i de industriella processerna och minskar produktionskostnaderna. Genom att dessutom öka FJV-användningen inom industriella produktionsprocesser och genom att konvertera eldriven kompressionskyla till FJV driven komfortabsorptionskyla, minskar säsongsvariationerna av FJV lasten, vilket leder till ett bättre utnyttjande av produktionsanläggningar för FJV. Om produktionsanläggningarna för baslast i FJVS är kraftvärmeverk, leder dessa två affärsstrategier till en ökad elproduktion i FJVS. När marginalproducerad el förknippas med höga utsläpp av växthusgaser (t.ex. när det produceras i koleldade kondenskraftverk), resulterar en minskning av den marginella elproduktionen (på grund av konvertering av industriella processer från el till FJV och på grund av konvertering eldriven kompressionskyla till FJV-driven absorptionkyla) i minskade globala emissioner av växthusgas. Om man däremot tittar på införandet av produktion av transportbiobränsle i FJVS är denna affärsstrategi mindre attraktiv ur ett miljöperspektiv. Orsaken till detta är att investering i produktion av transportbiobränsle istället för i kraftvärmeproduktion, leder till minskad elproduktion i FJVS. Den ökade FJV-användningen inom industrin och införandet av produktion av biobränsle för transportsektorn och FJV driven absorptionskylproduktion i FJVS leder till en ökad användning av biomassa i FJVS. När biomassa anses vara en begränsad resurs, är de miljömässiga fördelarna med att tillämpa dessa affärsstrategier relativt låga eller till och med obefintliga.
- Published
- 2014
19. Stockholms fjärrvärmenät idag och imorgon : en tvärvetenskaplig studie av ett regionalt energisystem
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Djuric Ilic, Danica, Henriksson, Malin, and Magnusson, Dick
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Technology and social change ,Teknik och social förändring - Abstract
Fjärrvärme spelar en viktig roll i strävan mot ett hållbart samhälle. Därför har vi i denna studie studerat Stockholms fjärrvärmenät och de aktörer som påverkar dess utformning. Syftet med studien har varit att undersöka drivkrafter och hinder för att utveckla fjärrvärmenäten i Stockholm. Vidare har syftet varit att studera hur aktörerna samverkar på kommunal och regional nivå för att bibehålla och/ eller vidareutveckla energisamarbeten. Fjärrvärmenätet har modellerats utifrån sex olika scenarier i optimeringsprogrammet MODEST. Genom scenarierna har vi kunnat testa dagens nät med bättre sammankopplingar, byggande av kraftvärmeverk samt naturgas som bränsle i kraftvärmeverken. Vidare har kvalitativa intervjuer med kommuner, energibolag, intresse- och branschorganisationer samt regionala aktörer genomförts. Studien visar att Stockholms fjärrvärmenät redan idag är väl sammankopplat vilket innebär att de ekonomiska vinsterna med ytterligare sammankopplingar inte är särskilt stora. Modelleringarna pekar dock på att byggande av kraftvärme, både med biobränsle och med naturgas, har en viss ekonomisk potential. En positiv effekt är också minskningen av de globala utsläppen av växthusgaser. Vinster med samarbeten och sammankopplingar från energibolagens sida är framförallt ökad driftsäkerhet och driftsoptimering samt möjligheten att samordna revisioner. För att samarbeten ska fungera är dock ekonomisk vinst för samtliga parter samt jämlika förhållanden dem emellan en förutsättning. Det är inte tekniska problem som hindrar utökade sammankopplingar, snarare är det ökat behov av planering och administration som försvårar utökat samarbete mellan bolag. Genom resultatet från intervjuerna kan slutsatsen dras att ett glapp finns i synen på samverkan mellan bolag och kommuner. Detta oavsett om bolagen är kommunalt eller privat ägda. Att energibolagen ska drivas på bolagsmässiga grunder kan vara en förklaring till detta. Energiplanering från kommunernas perspektiv har kommit att handla om klimatfrågan i hög utsträckning och ses ofta som synonymt med miljöarbete. Energiplaneringen har därmed fått högre status och flyttats närmre kommunledning. Samtidigt sker energiplanering på många olika nivåer, inom och mellan kommunerna samt på regional nivå, vilket gör det svårt att få ett samlat grepp om frågan. Också bolagen har olika syn på det regionala perspektivet vilket pekar på att det saknas ett fungerande regionalt organ där bolag och kommuner kan samverka. Även om både energibolagen och kommunerna är positivt inställda till fjärrvärme som teknik ser framtiden för fjärrvärmebranschen något osäker ut. Minskade värmelaster på grund av energieffektiviseringar och klimatförändringar bidrar till osäkerheten. Samtidigt väntar en utredning om tredjepartstillträde som potentiellt kan innebära stora förändringar för branschen. Genom att alla bygger kraftvärme kan det vara ett sätt att ändra marknadsinriktning från värme till el för att ge ökad lönsamhet. Det går inte heller att bortse från att Stockholmsregionen har goda förutsättningar för att införa ett tredjepartstillträde där kunderna själva kan välja fjärrvärmeleverantör. District heating (DH) plays an important role when aiming for a sustainable society. Due to this the focus in this study is on the Stockholm region district heating systems and the actors who influence the shaping of it. The aim of the study is to explore driving forces and obstacles in order to develop the district heating systems in Stockholm. Moreover we investigate energy collaborations on the regional and municipal level. Method used for the study includes modelling and qualitative semi-structured interviewing. The district heating systems has been modelled from sex different scenarios in the optimization program MODEST. We have been able to test the present network with better level of connections, with the building of new combined heat and power plants and with natural gas and bio fuels as fuels. Interviews with municipalities, energy companies and interest groups have been performed. The result of the study indicates that the central heating systems in Stockholm today are well connected and the gains of further connections are relatively small. The optimizations imply that the establishment of new combined heat and power plants, with either natural gas or bio fuels, has an immense economic potential. Another positive effect is lower emissions of greenhouse gases. The gains of collaborations and further connections of the nets from the view of the energy companies are above all an increased dependability and optimizing of the operation as a whole. Also the possibility to co-operate with company revisions is regarded as an advantage. In order to get well functioning co-operations between the companies economical profit for all parties, as well as equal conditions, is required. Worth mentioning is the fact that it’s not technical difficulties that restrains further connections of the DH-systems. The need of extended management and planning are a more plausible obstruction for increased co-operation between companies. An existing gap between the companies and the municipalities due to how they co-operate is visualized through the interviews. Whether the companies are owned by the municipalities or not is in this regard not important. That the energy companies are to be managed under businesslike conditions could explain this. Municipal planning has from the view of the municipalities come to be synonymous with environmental work. This trend has increased the status of energy planning, and has also moved within the organisation closer to the municipal executive board. At the same time energy planning is carried out at many different levels, within and between the municipalities but also on the region level. A consequence of this is that energy planning is hard to get a grip off. The companies also have different approaches to the regional perspectives, which point to the conclusion that a working regional body for coordination of the joint interest of the municipalities and the energy companies is needed. Even though both the energy companies and the municipalities are positive towards the technology of district heating the future for the district heating business is somewhat uncertain. Decreasing heath loads due to increasing energy efficiency and climate change is contributing to the uncertainness. Also the upcoming commission of what is called “Third Part Access” (TPA) could change the business at a large extend. Changing business orientation is an alternative that the energy companies may have to consider. The current trend of new establishment of combined power and heating plants makes it’s possible for the companies to start producing and selling electricity. The Third Part Access can also be an advantage for the businesses in the Stockholm region since it opens up the possibility for customers to choose which district heating provider they want.
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- 2009
20. District heating and ethanol production through polygeneration in Stockholm
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Djuric Ilic, Danica, Dotzauer, Erik, Trygg, Louise, Djuric Ilic, Danica, Dotzauer, Erik, and Trygg, Louise
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Ethanol can be produced with little impact on the environment through the use of polygeneration technology. This paper evaluates the potential of integrating a lignocellulosic ethanol plant into a district heating system by case study; the plant has an ethanol capacity of 95 MW with biogas. electricity and heat as by-products. Stockholms district heating system is used as the case study, but the results may be relevant also for other urban areas. The system has been studied using MODEST - an optimisation model framework. The results show that introducing the plant would lead to a significant reduction in the cost of heat production. The income from the biofuels and electricity produced would be about (sic)76 million and (sic)130 million annually, respectively, which is an increase of 70% compared to the income from the electricity produced in the system today. Assuming that the electricity produced will replace marginal electricity on the European electricity market and that the biofuel produced will replace gasoline in the transport sector, the introduction of the polygeneration plant in the district heating system would lead to a reduction of global CO(2) emissions of about 0.7 million tonnes annually.
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- 2012
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21. Introducing of absorption cooling process in CHP systems : an opportunity for reduction of global CO2 emissions
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Djuric Ilic, Danica, Trygg, Louise, Djuric Ilic, Danica, and Trygg, Louise
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The purpose of this research study is to examine the potential for reduction of global CO2 emissions (GECO2) by converting from vapour compression chillers to absorption chillers in Stockholm’s district cooling (DC) system and in Stockholm’s industrial sector. The analysis of the cooling production is made through optimizations in MODEST, a model framework developed for analysis of dynamic energy systems. The results show that more than 95% of the cooling demand that is currently met by compression chillers during the months from April to October should be produced by district heat (DH)-driven absorption cooling chillers in order to lower GECO2. As a consequence of this conversion, the utilization time of the combined heat and power (CHP) plants in Stockholm’s district heating (DH) system would be prolonged and at the same time the electricity used for compression cooling production would be reduced. Assuming coal condensing production as the marginal electricity production in the common electricity market and considering both the increase in electricity production and the reduction in electricity used, the potential for the reduction of GECO2 would be about 0.15 million tonnes annually. Rising cooling demand would make the introduction of absorption technology in the system even more interesting. If the comfort cooling demand in the region increases by 30%, electricity production in the system during the summer would be about 70% higher, which would lead to a reduction of GECO2 by 0.2 million tonnes annually compared with GECO2 today.
- Published
- 2011
22. Modelling District Heating Cooperations in Stockholm : An Interdisciplinary Study of a Regional Energy System
- Author
-
Magnusson, Dick, Djuric Ilic, Danica, Magnusson, Dick, and Djuric Ilic, Danica
- Abstract
In this paper, a combination of methods from social science (interviews) and technical science (modelling) have been used to analyse the potential for cooperation in the present and future district heating system in Stockholm. The aim of the paper is to explore barriers and driving forces for energy cooperation in the Stockholm district heating system and to analyse the potential for combined heat and power generation in the system. In the study it was found that with better connectivity in existing systems, the annual system cost would decrease by approximately 10 million €, and with new CHP plants a similar potential exists. There is also a large potential for decreasing the local and global emissions of CO2 with CHP plants. The results from the interviews showed that the existing cooperation has a long history and is working well today. The advantages are higher supply security and economic benefits, while disadvantages are a need for more administration and control because of a more complex system. That the barriers to cooperation are seldom technical is another conclusion. With the combination of methods, we have gained a better understanding of the actual potential for the development of the system.
- Published
- 2010
23. District heating and ethanol production through polygeneration in Stockholm
- Author
-
Djuric Ilic, Danica, primary, Dotzauer, Erik, additional, and Trygg, Louise, additional
- Published
- 2012
- Full Text
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