| 1. |
- Amiri, Shahnaz, 1962-
(författare)
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Economic and Environmental Benefits of CHP-based District Heating Systems in Sweden
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Future energy systems and thus the climate are affected by many factors, such as energy resources, energy demand, energy policy and the choice of energy technologies. Energy systems of the future are facing three main challenges; the steady growth of global energy demand, the energy resource depletion, as well as the increasing emissions of carbon dioxide (CO2) and other greenhouse gases and their impact on climate change. To meet the mentioned challenges with sustainability in mind, actions that increase energy efficiency and choosing an energy-efficient energy system which is cost efficient will be essential. Combined heat and power (CHP) plants and district heating and cooling could contribute greatly to increased system efficiency by using energy otherwise wasted.The aim of this study is to increase the understanding of how CHP-based district heating and cooling systems using different primary energy sources can contribute to more cost-efficient energy systems, which reduce global CO2 emissions, and to highlight the impact of some important parameters and measures on Swedish municipal district heating systems. An important assumption in this study is the estimation of CO2 emissions from electricity production, which is based on marginal electricity perspectives. In the short term, the marginal electricity is assumed to come from coal-fired condensing power plants while in the long term it consists of electricity produced by natural gas-fired combined cycle condensing power plants. This means that the local electricity production will replace the marginal electricity production. The underlying assumption is an ideal fully deregulated European electricity market where trade barriers are removed and there are no restrictions on transfer capacity.The results show that electricity generation in CHP plants, particularly in higher efficiency combined steam and gas turbine heat and power plants using natural gas, can reduce the global environmental impact of energy usage to a great extent. The results confirm, through the scenarios presented in this study, that waste as a fuel in CHP-based district heating systems is fully utilised since it has the lowest operational costs. The results also show how implementation of a biogas-based CHP plant in a biogas system contributes to an efficient system, as well as lowering both CO2 emissions and system costs. The results show that replacing electricity-driven (e.g. compression) cooling by heat-driven cooling using district heating (e.g. absorption chillers) in a CHP system is a cost-effective and climate friendly technology as electricity consumption is reduced while at the same time the electricity generation will be increased. The results of the study also show that there is potential to expand district heating systems to areas with lower heat density, with both environmental and economic benefits for the district heating companies.The results reveal that the operation of a studied CHP-based district heating system with an imposed emission limit is very sensitive to the way CO2 emissions are accounted, i.e., local CO2 emissions or emissions from marginal electricity production. The results show how the electricity production increases in the marginal case compared with the local one in order to reduce global CO2 emissions. The results also revealed that not only electricity and fuel prices but also policy instruments are important factors in promoting CHP-based district heating and cooling systems. The use of electricity certificates has a large influence for the introduction of biogas-based cogeneration. Another conclusion from the modelling is that present Swedish policy instruments are strong incentives for cogeneration with similar impact as applying external costs.
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| 2. |
- Amiri, Shahnaz, et al.
(författare)
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Possibilities and consequences of deregulation of the European electricity market for connection of heat sparse areas to district heating systems
- 2010
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Ingår i: Applied Energy. - : Elsevier BV. - 0306-2619 .- 1872-9118. ; 87:7, s. 2401-2410
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Tidskriftsartikel (refereegranskat)abstract
- The objective of the study is to analyse the conditions for connection of residential buildings in heat sparse areas to district heating systems in order to increase electricity production in municipal combined heat and power plants. The European electricity market has been assumed to be fully deregulated. The relation between connection of heat sparse areas, increased electricity and heat production as well as electricity prices, fuel prices and emissions rights is investigated. The results of the study show that there is potential to expand the district heating market to areas with lower heat concentrations in the cities of Gavle, Sandviken and Borlange in Sweden, with both economic and environmental benefits. The expansion provides a substantial heat demand of approximately 181 GWh/year, which results in an electricity power production of approximately 43 GWh/year. Since the detached and stand-alone houses in the studied heat sparse areas have been heated either by oil boiler or by direct electricity, connection to district heating also provides a substantial reduction in emissions of CO(2). The largest reductions in CO(2) emissions are found to be 211 ktonnes/year assuming coal-fired condensing power as marginal electricity production. Connection of heat sparse areas to district heating decrease the system costs and provide a profitability by approximately 22 million EURO/year for the studied municipalities if the price of electricity is at a European level, i.e. 110 EURO/MWh. Sensitivity analysis shows, among other things, that a strong relation exists between the price of electricity and the profitability of connecting heat sparse areas to district heating systems.
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| 3. |
- Amiri, Shahnaz, et al.
(författare)
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Simulation and introduction of a CHP plant in a Swedish biogas system
- 2013
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Ingår i: Renewable energy. - Oxford : Elsevier. - 0960-1481 .- 1879-0682. ; 49:SI, s. 242-249
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Tidskriftsartikel (refereegranskat)abstract
- The objectives of this study are to present a model for biogas production systems to help achieve a more cost-effective system, and to analyse the conditions for connecting combined heat and power (CHP) plants to the biogas system. The European electricity market is assumed to be fully deregulated. The relation between connection of CHP. increased electricity and heat production, electricity prices, and electricity certificate trading is investigated. A cost-minimising linear programming model (MODEST) is used. MODEST has been applied to many energy systems, but this is the first time the model has been used for biogas production. The new model, which is the main result of this work, can be used for operational optimisation and evaluating economic consequences of future changes in the biogas system. The results from the case study and sensitivity analysis show that the model is reliable and can be used for strategic planning. The results show that implementation of a biogas-based CHP plant result in an electricity power production of approximately 39 GW h annually. Reduced system costs provide a profitability of 46 MSEK/year if electricity and heat prices increase by 100% and electricity certificate prices increase by 50%. CO2 emission reductions up to 32,000 ton/year can be achieved if generated electricity displaces coal-fired condensing power.
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| 4. |
- Andersson, Kristina
(författare)
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"It's Funny that We Don't See the Similarities when that's what We're Aiming for"-Visualizing and Challenging Teachers' Stereotypes of Gender and Science
- 2012
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Ingår i: Research in science education. - : Springer Science and Business Media LLC. - 0157-244X .- 1573-1898. ; 42:2, s. 281-302
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Tidskriftsartikel (refereegranskat)abstract
- This study illuminates teachers' conceptions of gender and science and possibilities to challenge these conceptions. Since 2005, a group of teachers (K-6) in Sweden have met approximately once a month in two-hour seminars to discuss and develop their instruction in science and technology based on a gender perspective. The present data consist mainly of audio-recordings of the teacher seminars and video-recordings of science activities with students. Analysis of the empirical data has been carried out in several stages and was inspired by thematic analysis, the theoretical framework of which is based on Hirdman's and Beauvoir's theories of gender. The results show that the teachers' ideas about gender/equity and science exist on several levels, within which various conceptions are represented. On the one hand, "reasoning around similarity", where teachers consider that both girls and boys should have the same prerequisites for working with science. In contrast, stereotypical conceptions of girls and boys occur when the teachers evaluate their activities with students, and condescending attitudes toward girls are also observed. The girls' ways of working with science are not as highly valued as the boys', and this outlook on children can ultimately have consequences for girls' attitudes towards the subject. When teachers are allowed to read their own statements about the girls, they get "a glimpse of themselves", and their condescending ideas about girls are made visible. In this way, the teachers can begin their active work towards change, which may lead to new outlooks on and attitudes towards students.
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| 5. |
- Andersson, Kristina, 1962-
(författare)
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Lärare för förändring : att synliggöra och utmana föreställningar om naturvetenskap och genus
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Lärares genusmedvetenhet i relation till naturvetenskaplig verksamhet är fokus för denna avhandling, som belyses genom två studier: en longitudinell aktionsforskningsstudie som genomfördes tillsammans med en grupp förskollärare/lärare och en studie där verksamma förskollärare/lärare under en fortbildningskurs fick tillämpa en genusteori på en verklig klassrumshändelse. Studierna visar att genusarbete är komplicerat eftersom det inbegriper många aspekter av livet och en viktig del av genusmedvetenheten är att förhålla sig till dessa olika aspekter. Det är av avgörande betydelse att utmana föreställningar om genus, där utmaningarna resulterar i att föreställningarna blir verbaliserade och därmed synliggjorda. Vidare visar studierna att genom att ta avstamp i feministisk vetenskapskritik och pedagogik kan ett alternativt sätt att förhålla sig till lärande och undervisning i naturvetenskap bli möjligt. För lärare som inte har en naturvetenskaplig bakgrund, men som ska genomföra aktiviteter eller undervisa i ämnena, blir de didaktiska och pedagogiska kompetenser de redan besitter en startpunkt för att utveckla sina ämnesdidaktiska förmågor. Kompetensutveckling med ett feministiskt anslag kan ge lärarna ”empowerment” som medför att de känner större delaktighet i den naturvetenskapliga praktiken och därmed kan bidra till att utveckla såväl dess kultur som kunskapsstoffet. Avhandlingen ger också nya metodologiska kunskapsbidrag om aktionsforskning. Ett resultat är att tid är en viktig faktor som man måste ta hänsyn till beroende på vilken förändring man vill åstadkomma. Forskaren som deltar i aktionsforskningen som en ”outsider” har en viktig funktion genom att kunna överblicka processen samt uppmärksamma och använda sig av kritiska händelser för att driva förändringsarbetet framåt.
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| 6. |
- Andersson, Lars, 1947-, et al.
(författare)
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Jämlik ålderdom? : I samtiden och framtiden
- 2012. - 1
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Ojämlikheten bland äldre tar sig många uttryck. I bokens kapitel ställs frågor om möjligheter att arbeta längre, och hur det går för dem som måste sluta arbeta i förtid. Andra frågor är hur det nya pensionssystemet fungerar ur rättvisesynpunkt, liksom hur jämlikt samhället egentligen är när det gäller ekonomi, hälsa och äldreomsorg. Boken visar att ojämlikhet i ålderdomen existerar i varierande grad och inom flera välfärdsområden. Med mer jämlika livsvillkor skapas förutsättningar för en god ålderdom för fler.Boken vänder sig till studerande inom socialt arbete, sociologi, vårdvetenskap och närliggande ämnen, i synnerhet på kurser med inriktning på äldre och välfärdsfrågor.
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| 7. |
- Andersson, Lars, 1947-, et al.
(författare)
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Äldre arbetstagares delaktighet i arbetslivet
- 2012
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Ingår i: Social delaktighet. - Helsingfors : Arcada. - 9789525260342 - 9789525260359 ; , s. 41-58
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 8. |
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| 9. |
- Bengtson, Anna, et al.
(författare)
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Managing stability and crises in business relationships : The case of Ericsson in an emerging market
- 2013
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Ingår i: European Business Review. - : Emerald Group Publishing Limited. - 0955-534X .- 1758-7107. ; 25:6, s. 518-535
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Tidskriftsartikel (refereegranskat)abstract
- Purpose – Adding to the theoretical view of relationship development, this paper holds the view that relationship change encompasses not only smooth incremental change but also includes crises which can trigger relationship weakening, dissolution and/or recovery. The aim is to develop a theoretical view that allows understanding of both smooth incremental and critical changes in the process of relationship development.Design/methodology/approach – Based on a business network perspective, the paper's relationship view holds uncertainty, commitment and trust as central explanatory elements. The process view is composed of three episodes: incremental relationship development; relationship crisis; and ending or survival. The paper employs a longitudinal case study method and discusses how the relationship between the Swedish firm, Ericsson, and its counterpart, Telefónica, develops in the emerging market of Argentina during the period of 1998-2004. Findings – Conclusions demonstrate the vulnerability of relationships due to counterparts' behaviour and network embeddedness. This is a risk of commitment deterioration, and remedial actions like investment in new commitments will reduce distrust and uncertainty. Re-energizing relationships incrementally requires behaviour like waiting strategies, when otherwise the choice is to exit.Originality/value – Few researchers have combined the findings from stable relationship development studies with the findings from research on crisis into one model handling both stability and instability in business relationships. This is despite the fact that episodes of turbulence and instability are becoming more common in business relationships, due to entrance into more unstable markets, and markets crises of various types.
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| 10. |
- Bengtsson, Lars, et al.
(författare)
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Combining Master and Apprentice Roles : Potential for Learning in Distributed Manufacturing Networks
- 2010
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Ingår i: Creativity and Innovation Management. - Chichester, West Sussex, United Kingdom : Wiley-Blackwell. - 0963-1690 .- 1467-8691. ; 19:4, s. 417-427
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this paper is to explore possible effects for learning when a manufacturing plant takes a double role, as being both master plant and apprentice plant, in a globally distributed industrialization process. Industrialization is here understood as the process of preparing new products for volume manufacturing. Two research questions are addressed. The first is what characterizes the dual roles. The second concerns how the dual roles affect knowledge integration and learning processes, and whether this arrangement facilitates learning between master and apprentice. Based on a study of a global telecom equipment company, the paper provides insights into some of the challenges and effects of dynamic switching of roles. By separating the network function from the strategic role of the plant, the study identifies four options for learning. The case adds to the literature on learning in manufacturing networks and to previous research on how distributed processes affect innovation capability.
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