10 results on '"Djuric Ilic, Danica"'
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2. Economic and environmental benefits of converting industrial processes to district heating
- Author
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Djuric Ilic, Danica and Trygg, Louise
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- 2014
- Full Text
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3. 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
- Full Text
- View/download PDF
4. Integration of biofuel production into district heating – Part II: an evaluation of the district heating production costs using Stockholm as a case study
- Author
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Djuric Ilic, Danica, Dotzauer, Erik, Trygg, Louise, and Broman, Göran
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- 2014
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5. Introduction of large-scale biofuel production in a district heating system – an opportunity for reduction of global greenhouse gas emissions
- Author
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Djuric Ilic, Danica, Dotzauer, Erik, Trygg, Louise, and Broman, Göran
- Published
- 2014
- Full Text
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6. Classification of Measures for Dealing with District Heating Load Variations-A Systematic Review
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Djuric Ilic, Danica
- Subjects
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.
- Published
- 2021
7. With district heating toward a sustainable future : System studies of district heating and cooling that interact with power, transport and industrial sectors
- Author
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Djuric Ilic, Danica
- Subjects
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
8. 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, and Ödlund, Louise
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COGENERATION of electric power & heat & the environment , *GREENHOUSE gas mitigation , *CARBON dioxide mitigation , *CORPORATE accounting , *DECISION making in business , *ENVIRONMENTAL policy - Abstract
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 CO 2 emissions reductions through CHP production. Using a consequential CO 2 assessment method for comparison, the study shows that purchasing decisions supported by the Corporate Standard or the GO scheme can increase total CO 2 emissions. It also shows that the Corporate Standard and EU frameworks can counteract CHP production and its contribution to CO 2 emissions reduction. We recommend that consequential GHG assessment methods be used for emissions reduction decisions, including when designing policy instruments aimed at emissions reduction. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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9. No zero burden assumption in a circular economy.
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Djuric Ilic, Danica, Eriksson, Ola, Ödlund (former Trygg), Louise, and Åberg, Magnus
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WASTE management , *SUSTAINABLE development , *SUSTAINABILITY , *ENERGY consumption , *WASTE products - Abstract
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 product's 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 as waste. Waste entering the waste management system with “zero burden”, by releasing the previous actors of the waste life cycle from any responsibility related to the environment (i.e. by shifting the total environmental burden into the waste management system), does not capture the problems with waste generation. [ABSTRACT FROM AUTHOR]
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- 2018
- Full Text
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10. District heating and ethanol production through polygeneration in Stockholm
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Djuric Ilic, Danica, Dotzauer, Erik, and Trygg, Louise
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HEATING from central stations , *ETHANOL fuel industry , *LIGNOCELLULOSE , *ELECTRIC power , *EMISSIONS (Air pollution) , *HEATING , *CARBON dioxide - Abstract
Abstract: 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 95MW with biogas, electricity and heat as by-products. Stockholm’s 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 €76million and €130million 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 CO2 emissions of about 0.7million tonnes annually. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
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