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  • 1.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering.
    Fluidized bed combustion and gasification modeling and utilization of the models for diagnostics, control and decision support2009In: Proceedings Mathmod 2009, February 4-7 in Vienna., 2009Conference paper (Refereed)
  • 2.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering.
    Modeen, P-E.
    Applications of simulation models for diagnostics and model based control in pulp and paper and power plant applications2009Conference paper (Refereed)
  • 3.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering.
    Modén, P.
    Forskning kring pannstyrning med on-line fukthaltsmätning på biobränsle2008In: Varmeforsk project publication series, no 1073Article in journal (Other academic)
  • 4.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Wallin, Fredrik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Effect of different renovation actions, their investment cost and future potential2017In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 143, p. 73-79Article in journal (Refereed)
    Abstract [en]

    65% of the buildings in Västerås, situated in the region of Mälardalen, Sweden were built before 1970. It is thus time for renovation. The situation is the same in most cities in Sweden and Northern Europe. The depth of renovation can be quite different. In this paper we evaluate some examples where cost is compared to energy saving effect. How to plan renovation to make use of the available capital in the cities is discussed. As a complement to direct renovation actions also behavior change with respect to energy is discussed and exemplified. The cost for energy actions in relation to other renovation aspects is discussed especially for the passive house case in Allingsås, Sweden. The passive house center calculate an extra cost for passive house standard to be 10 000 €/apartment while an external consultant has the figure 40 000 € of the total cost of 120 000 €. With this space heating can be 18 kWh/m2.year, or a reduction by 84 % with respect to space heating and 62% for overall heat and hot water demand. If you use the latter cost figure passive house standard is not motivated from an energy savings perspective while if using the lower figure it is very interesting. For the other less deep renovations we see that adding more insulation and three glass windows is motivated if the degradation has been strong, while a simpler renovation may be ok if the outer surface coating is not too bad. For these less deep renovations we see cost figures of 65 €/m2 respectively 28 €/m2 with reduction of heating and hot water demand of 56 % respectively 34 %. 

  • 5.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Jansson, J.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Use of mathematical models and simulators for on-line applications in pulp and paper industry2006Conference paper (Refereed)
  • 6.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Jansson, J.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering.
    Use of modelica for “multi phase flow” in complex systems, with application for continuous pulp digesters2009In: Proceedings of APMMCT. Kleminski, Ukraine,  May 17-18, 2005., 2009Conference paper (Refereed)
  • 7.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Jansson, J.
    Mälardalen University, School of Business, Society and Engineering.
    Dotzauer, Erik
    Mälardalen University, School of Business, Society and Engineering.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering.
    Use of combined physical and statistical models for online applications in the pulp and paper industry2009In: Mathematical and Computer Modelling of Dynamical Systems, Vol. 15, no 5, p. 425-434Article in journal (Refereed)
    Abstract [en]

    This paper discusses the accuracy of different types of models. Statistical models are based on process data and/or observations from lab measurements. This class of models are called black box models. Physical models use physical relationships to describe a process. These are called white box models or first principle models. The third group is sometimes called grey box models, being a combination of black box and white box models. Here we discuss two examples of model types. One is a statistical model where an artificial neural network is used to predict NOx in the exhaust gases from a boiler at Mlarenergi AB in Vsters, Sweden. The second example is a grey box model of a continuous digester. The digester model includes mass balances, energy balances, chemical reactions and physical geometrical constraints to simulate the real digester. We also propose that a more sophisticated model is not required to increase the accuracy of the predicted measurements.

  • 8.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Skvaril, Jan
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Aulin, Robert
    Swedish University of Agricultural Sciences, Sweden.
    Odlare, Monica
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Forest biomass for bioenergy production – comparison of different forest species2014In: / [ed] J. Yan, 2014Conference paper (Refereed)
    Abstract [en]

    Forest biomass is a renewable and sustainable source of energy that can be used for producing electricity, heat, and biofuels. The production of biomass for energy is considered to be an important step in developing sustainable communities and managing greenhouse gas emissions effectively. Biomass properties vary and are commonly associated with plant species. Hence, efficient methods to predict biofuel characteristics will greatly affect the utilization and management of feedstock production. In this paper attempt was made to correlate various chemical characteristics with NIR spectra. Wood chips from various plant species was analyzed for lignin content, heating value, ash content and NIR and the results were evaluated with correlation, PCA and PCR. Initial evaluation showed promising results where chemical components in the wood correlate to NIR spectra. A selection of results will be presented in this paper. Further analysis as well as results from PCA and PCR models will be presented in the full paper version.

  • 9.
    Avelin, Anders
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Widarsson, Björn
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Lilja, Reijo
    VTT, Espoo, Finland.
    Time based data reconciliation and decision support for a CFB boiler2009In: IFAC Proceedings Volumes (IFAC-PapersOnline), 2009 / [ed] Yrjö Majanne, Tampere: Tampere University Press , 2009, p. 338-343Conference paper (Refereed)
    Abstract [en]

    This paper covers a method for operator decision support, where physical simulation models are used to connect different physical variables to each other. By comparing energy and material balances for a larger process area inconsistencies in single process parts and sensor measurements can be detected, by following the development between single measurements and values predicted from the simulations. This information then can be used as input to e.g. a BN, Bayesian Network, for decision support. The application has been for a CFB boiler at Mälarenergi AB. The simulators have been made in Modelica respectively a more advanced model in APROS.

  • 10.
    Bartusch, Cajsa
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Odlare, Monica
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Wallin, Fredrik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Electricity consumption and load demand in single-family house2008Conference paper (Refereed)
  • 11.
    Berglund, Karin
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Innovation, Design and Engineering.
    Bjurström, Erik
    Mälardalen University, School of Innovation, Design and Engineering.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Hallén, Lars
    Mälardalen University, School of Business, Society and Engineering.
    Johanson, Ulf
    Mälardalen University, School of Business, Society and Engineering.
    Segelod, Esbjörn
    Mälardalen University, School of Business, Society and Engineering.
    Conclusions and Directions for Future Research on Industrial Renewal2011In: Studies in Industrial Renewal: Coping with Changing Contexts / [ed] Esbjörn Segelod, Karin Berglund, Erik Bjurström, Erik Dahlquist, Lars Hallén and Ulf Johanson, Västerås: Mälardalen University , 2011, 200, p. 455-471Chapter in book (Refereed)
  • 12. Blanco, A.
    et al.
    Dahlquist, Erik
    Kappen, J.
    Manninen, J.
    Negro, C.
    Ritala, R.
    Use of modelling and simulation in the pulp and paper industry2006Conference paper (Refereed)
  • 13. Blanco, A.
    et al.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Kappen, J.
    Manninen, J.
    Negro, C.
    Ritala, R.
    Use of modelling and simulation in the pulp and paper industry2008In: Mathematical and Computer Modelling of Dynamical Systems, ISSN 1387-3954, E-ISSN 1744-5051, Vol. 15, no 5, p. 409-423Article in journal (Refereed)
    Abstract [en]

    In pulp and paper the modelling and simulation of the pulp production processes was the first major application. Since then several other applications have been realised though papermaking has never been on the lead concerning the use of computer-based modelling and simulation. The complex nature of the materials is one of the most demanding challenges and the biggest hurdle for any electronic description of the papermaking process or paper itself. So other industries took the lead and it is now for the paper industry to learn from these industries what can be done with the help of computers to control or optimise processes or to design new grades. The application of results gained with the use of modelling and simulation techniques in pulp and paper manufacturing processes has helped the industry to, for example, reduce emissions and increase the productivity and cost-efficiency of the processes. Still there are many important tasks open. A better understanding of the mechanisms of the processes and their control loops has to be achieved in order to further improve the paper quality, stabilise the wet-end chemistry, and enhance the runnability. Important features to be developed are new process designs, efficient process monitoring and systems that offer decision support during operation. In this paper a review of the state of the art on modelling and simulation in the pulp and paper industry is presented as well as further research needs.

  • 14. Blanco, Angeles
    et al.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Kappen, Johannes
    Manninen, Jussi
    Negro, Carlos
    Rittala, Risto
    Chapter 12: Modelling and simulation in the Pulp andPaper Industry: Current state and future perspectives2009In: Handbook of Control Room Design and Ergonomics: A Perspective for the Future / [ed] Toni Ivergård and Brian Hunt, Taylor & Francis Group, 2009, 2nd, p. 311-326Chapter in book (Other academic)
  • 15.
    Bruch, Jessica
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Rösiö, Carin
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Kurdve, Martin
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Bengtsson, Marcus
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Granlund, Anna
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Swanström, Lennart
    Mälardalen University.
    Development of Robust Production Equipment: A guide to strong collaboration between users and suppliers2016Report (Other academic)
    Abstract [en]

    The result of today’s global and increasingly tough competition is narrow market windows and a demand for quick volume increases in production. This in turn means increased demands for a rapid and effective development of production equipment that ensures high performance right at the start of production. Robust production equipment with a high level of production efficiency and reduced costs for operation and maintenance therefore make up one of the most important factors for strong competitiveness and high profitability for Swedish industrial enterprises. Strong collaboration between users and suppliers is the key to success in this type of investment project. This handbook therefore presents a model that can be used by manufacturing companies who want to develop robust production equipment. The model and the other recommendations of the handbook focus on projects that are to be carried out in strong collaboration and are targeted at both users and suppliers. The model has been deve-loped through “EQUIP – User-supplier integration in production equipment design”, which has received funding from the Knowledge Foundation 2013–2016. The model consists of seven development phases based on the production equipment life cycle: Phase 1 – Preliminary study Phase 2 – Concept study Phase 3 – Procurement Phase 4 – Detailed design Phase 5 – Construction Phase 6 – Installation and commissioning Phase 7 – Production In each phase, critical activity steps and recommendations are presented for how to distribute responsibility within and between the parties involved. The model adopts a life cycle perspective for development projects in order to facilitate collaboration and to more clearly visualise the link between activities and their impact on the project success. Within the scope of an investment project, there is a great potential for developing sustainable production solutions. For this reason, this handbook also presents seven guidelines that may provide you with support in developing production equipment that remains secure, lean and sustainable throughout the equipment life cycle. The main purpose of the handbook is to facilitate collaboration through the whole investment project in a way that benefits both parties and which contributes to lasting relationships. The results of the research project show that there is a great interest in improved collaboration from both users and suppliers. For this reason, support, tools and preparedness from both parties are required to venture into investing time and resources in collaboration from the beginning, in the early phases of a new development project. This is then the potential to lay the foundation for long-term collaboration and for designing the best possible production equipment in the shortest time possible.

  • 16.
    Bruch, Jessica
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. IPR (Innovation and Product Realisation).
    Rösiö, Carin
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. IPR (Innovation and Product Realisation).
    Kurdve, Martin
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. IPR (Innovation and Product Realisation).
    Bengtsson, Marcus
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. IPR (Innovation and Product Realisation).
    Granlund, Anna
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. IPR (Innovation and Product Realisation).
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Swanström, Lennart
    Mälardalen University.
    Utveckling av Robust Produktionsutrustning: En guide för god samverkan mellan beställare och leverantör2016Report (Other academic)
    Abstract [en]

    Av dagens globala och allt hårdare konkurrens följer korta marknadsfönster och krav på snabb volym- uppgång i produktion. Det innebär i sin tur ökade krav på snabb och effektiv utveckling av produktions- utrustning som säkerställer hög prestanda direkt vid produktionsstart. Robust produktionsutrustning med hög produktionseffektivitet och minskade kostnader för drift och underhåll är därför en av de viktigaste faktorerna för stark konkurrenskraft och hög lönsamhet för svenska industriföretag. God samverkan mellan beställare och leverantör är nyckeln till framgång i denna typ av investerings- projekt. Denna handbok presenterar därför en modell som kan användas av tillverkande företag som vill utveckla robust produktionsutrustning. Modellen och övriga rekommendationer i handboken fokuserar på projekt som ska genomföras i stark samverkan och riktar sig till både beställaren och leverantören. Den har utvecklats i forskningsprojektet ”EQUIP – kund- och leverantörsintegration i utformning av produktionsutrustning” som finansierats av KK-stiftelsen under 2013-2016. Modellen består av sju utvecklingsfaser som är baser- ade på produktionsutrustnings livscykel: Fas 1 – Förstudie Fas 2 – Konceptstudie Fas 3 – Upphandling Fas 4 – Detaljerad utformning Fas 5 – Uppbyggnad Fas 6 – Installation och driftsättning Fas 7 – Produktion I varje fas presenteras kritiska aktivitetssteg och rekommendationer för hur ansvaret för dessa bör fördelas inom och emellan deltagande parter. Modellen använder ett livscykelperspektiv för utvecklingsprojekt för att underlätta samverkan samt tydligare visualisera sambandet mellan aktiviteter och deras påverkan på projektets framgång. Inom ramen för ett investeringsprojekt finns stor potential att utveckla hållbara produktionslösningar. Därför presenterar denna handbok även sju guider som kan stödja er i att ta fram produktionsutrustning som är säker, lean och hållbar under hela utrustningens livscykel. Huvudsyftet med handboken är att underlätta samverkan under hela investeringsprojektet på ett sätt som gagnar båda parter och bidrar till varaktiga relationer. Forskningsprojektets resultat visar att det finns ett stort intresse för främjad samverkan från både beställ- are och leverantör. Därför behövs stöd, verktyg och beredskap från båda parter för att våga investera tid och resurser på samverkan redan från början, i de tidiga faserna av ett nytt utvecklingsprojekt. Det är då potentialen att lägga grunden till långsiktig samverkan och utforma bästa möjliga produktionsutrustning på kortast möjliga tid är som störst.

  • 17.
    Campillo, Javier
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Danilov, D. L.
    University of Technology Eindhoven, Eindhoven, MB, Netherlands.
    Ghaviha, Nima
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Notten, P. H. L.
    University of Technology Eindhoven, Eindhoven, MB, Netherlands.
    Zimmerman, Nathan
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Battery technologies for transportation applications2016In: Technologies and Applications for Smart Charging of Electric and Plug-in Hybrid Vehicles, Springer International Publishing , 2016, p. 151-206Chapter in book (Other academic)
    Abstract [en]

    More than a fifth of the greenhouse emissions produced worldwide come from the transport sector. Several initiatives have been developed over the last few decades, aiming at improving vehicles’ energy conversion efficiency and improve mileage per liter of fuel. Most recently, electric vehicles have been brought back into the market as real competitors of conventional vehicles. Electric vehicle technology offers higher conversion efficiencies, reduced greenhouse emissions, low noise, etc. There are, however, several challenges to overcome, for instance: improving batteries’ energy density to increase the driving range, fast recharging, and initial cost. These issues are addressed on this chapter by looking in depth into both conventional and non-conventional storage technologies in different transportation applications. 

  • 18.
    Campillo, Javier
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Ralf, Späth
    ABB.
    Smart Homes as Integrated Living Environments2015In: Handbook of Clean Energy Systems: Volume 4 - Intelligent Energy Systems: / [ed] Jinyue Yan, John Wiley & Sons, 2015Chapter in book (Refereed)
  • 19.
    Campillo, Javier
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Vassileva, Iana
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Technology capacity assessment tool for developing city action plans to increase efficiency in mid-sized cities in Europe2016In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 88, p. 16-22Article in journal (Refereed)
    Abstract [en]

    Transition towards energy efficient cities requires an effective upgrade of all the different areas of urban energy production, distribution and use. The paper presents a method for collecting the information required for analysing the technical variation of strengths and weaknesses in infrastructure capabilities in European medium-sized cities, as well as to help identify best practices and tools for enhancing the energy performance of city energy systems.

  • 20.
    Campillo, Javier
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Wallin, Fredrik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Vassileva, Iana
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Is real-time electricity pricing suitable for residential users without demand-side management?2016In: Energy Journal, ISSN 0195-6574, E-ISSN 1944-9089, Vol. 109, p. 310-325Article in journal (Refereed)
    Abstract [en]

    The smart metering infrastructure in Sweden allows electricity providers to offer electricity RTP (real time pricing) to homeowners, together with other dynamic pricing contracts across the country. These contracts are supposed to encourage users to shift power consumption during peak hours to help balance the load in the power system. Of all the available contracts in Sweden, monthly-average price holds the largest share, in response to the low electricity prices during the last three years. It is not clear if RTP will become a popular dynamic pricing scheme since daily price fluctuations might keep customers away from this type of contract. Literature review suggests that RTP adoption is only beneficial when combined with the use of customer demand flexibility, but it does not provide enough information about users adopting RTP without changing their electricity usage profile. This paper studies the economic impact if customers would shift to RTP contracts without adopting demand-side management. To achieve this, electricity costs from a large group of households were calculated and compared between both pricing schemes using the hourly consumption data of a 7-year period. Results suggest that the RTP electricity contract offer a considerable economic savings potential even without enabling consumer demand-side management. 

  • 21.
    Campillo, Javier
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Ghaviha, Nima
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Zimmerman, Nathan
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Flow batteries use potential in heavy vehicles2015In: Electrical Systems for Aircraft, Railway and Ship Propulsion, ESARS, 2015, p. Article number 7101496-Conference paper (Refereed)
    Abstract [en]

    Although batteries have been used in personal vehicles for more than a hundred years, the cost of the technology, limitation in range, absence of sufficient recharging infrastructure and rapid development of internal combustion engines during the mid-twentieth century limited its use to very niche applications. More recently, a global need for reducing CO2 emissions from fossil fuel usage and the great developments in power systems as well as in battery technology offers electric vehicles the possibility to return to the market, not just for personal use but also for a wide variety of transportation applications. In the present paper, a feasibility study for using flow batteries in heavy vehicles, more specifically, construction equipment is presented. The authors used measured energy demand profiles for different operation conditions of a wheel loader and developed a simulation model for a vanadium redox flow battery to test the performance of this vehicle using a flow battery. Additionally, the authors did a short theoretical analysis for the potential for flow batteries in train transportation, focusing on the requirements and limitations of the technology for this application.

  • 22.
    Campillo, Javier
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Vassileva, Iana
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Lundström, Lukas
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Thyghesen, Richard
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Beyond the building–understanding building renovations in relation to urban energy systems2016In: Journal of Settlements and Spatial Planning, ISSN 2069-3419, Vol. 2016, no Spec. Iss. 5, p. 31-39Article in journal (Refereed)
    Abstract [en]

    About 35% of Europe’s building stock is over 50 years old and consumes about 175 kWh/m2 for heating, between 3-5 times the amount required by the newly constructed buildings. Annually, between1 and 1.5% new buildings are built and only between 0.2 and 0.5% are removed, therefore the focus needs to be put on the renovation of the existing building stock. The implementation of energy conservation measures (ECMs) in the residential sector becomes a very important strategy to meet the EU´s 20% energy consumption reduction of the 20-20-20 goals. The main challenge, however, is to determine which of the ECMs strategies are the best to provide not just with the best energy consumption reduction, but also with the best environmental impact and economic benefits. This paper addresses this issue and analyses the impact of different ECMs by focusing not only on the buildings themselves, but on the energy supply network and the overall energy system as a whole. To achieve this, we review five case studies in Sweden that use different ECMs as well as other alternatives, such as: distributed generation (DG) and energy storage. Results suggest that although there is no standard protocol that would fit all renovation projects, the existing methodologies fall short to provide the best overall impact on the energy system and that a broader analysis of the local conditions should be carried out before performing large building renovation projects.

  • 23.
    Campillo, Javier
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Wallin, Fredrik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Vassileva, Iana
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Economic Impact of Dynamic Electricity Pricing Mechanisms Adoption fo rHouseholds in Sweden2013Conference paper (Refereed)
    Abstract [en]

    Global smart metering market growth has increased significantly over the past few years and the trend is expected to continue. Smart metering technology enables energy consumption feedback and the adoption of dynamic pricing mechanisms that encourages users to shift power consumption from peak-use times to lower-use times, in order to help balance the load in the power system. In Sweden particularly, the introduction of the new legislation and adoption of remote meters in 2009, in combination with more flexible pricing schemes, offer a great opportunity for users to reduce energy consumption during peak times, increase their energy efficiency and therefore reduce their overall cost. More recently, in 2012, Swedish energy providers started offering hourly spot-based electricity price to homeowners in order give them access to pricing mechanisms that are closer to the real cost of electricity supply. Additionally to hourly pricing, other dynamic pricing contracts are available for consumers all across the country; however, conventional agreements that use fixed-rates for electricity are still the most common. This paper analyzes the economic impact for consumers, if dynamic pricing, enabled through smart metering technologies, is adopted. To achieve this, electricity costs from a large group of households were calculated, using users’ hourly consumption data with both conventional fixed rates and real time pricing, in order to understand their impact on customers’ bills. Obtained results suggest that real time pricing has great savings potential, especially for years where summer rainfall and winter conditions are within average. However, in order to increase savings and have them consistent year after year, changes in user time-of-use consumption profile are required. Moreover, this research work leads to further analysis on dynamic pricing combined with demand response in order to optimize electricity costs.

  • 24.
    Campillo, Javier
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Wallin, Fredrik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Vassileva, Iana
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Electricity Demand Impact from Increased use of Ground Sourced Heat Pumps2012In: IEEE PES Innovative Smart Grid Technologies Conference Europe, 2012, p. Artnr. 6465876-Conference paper (Refereed)
    Abstract [en]

    The use of ground-sourced heat pumps as main heating systems has increased in Sweden in the last fifteen years to the point that it is the country with the highest amount of GSHP in Europe. Heat pumps are chosen by many households due to their economic savings value; In contrast, electricity prices in Sweden have almost doubled since 2006, threatening their economic benefits. It is therefore, essential to understand GSHPs impact on the user´s electricity consumption and provide suitable demand-response programs that could help develop a model capable of forecasting consumption and provide decision support information to make the best use of the technology. This paper analyses questionnaire surveys and consumption patterns were evaluated for 322 households with installed GSHPs and different pricing schemes in order to increase the understanding of mass use of this type of heating system.

  • 25.
    Chukwu, C.
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Natere, G.
    Rosen, M.
    Dahlquist, Erik
    Thermal Optimization and Economic analysis of a Marncoh Heat Engine2008Conference paper (Refereed)
  • 26.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    An overview of thermal biomass conversion technologies2013In: Technologies for Converting Biomass to Useful Energy: Combustion, gasification, pyrolysis, torrefaction and fermentation / [ed] Erik Dahlquist, CRC Press, 2013, 1, p. 1-4Chapter in book (Refereed)
    Abstract [en]

    Officially the use of biomass for energy use globally is only 10-13 % of the total energy demand of 140 000 TWh/y. Still, the production of biomass annually is in the range of 270 000 TWh/y. Most of it obviously is not used very efficiently, although some is also used as food. There is thus a need for new methods for converting biomass into refined products like chemicals, fuels, wood and paper products, heat, cooling and electric power. The different type of conversion methods covered is biogas production, bio-ethanol production, torrefaction, pyrolysis, high temperature gasification and combustion. These methods are covered as well as principals for controlling the processes. The suitability for the different methods for different type of biomass as well as different versions of the methods is presented – both existing methods and those being developed for the future. System optimization using modeling methods and simulation is covered as well as analysis of advantages of different solutions. Many key-experts from all over the world are presenting the keys of their specialties to give us an up-to-date view of the situation all over the world. This book has the aim to give facts and inspiration to professionals like engineers and researchers, students as well as those working for different type of authorities or societal organizations.

  • 27.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Biomass as Energy Source: Resources, Systems and Applications2013Collection (editor) (Refereed)
    Abstract [en]

    The use of energy is approximately 140 000 TWh per year globally. It is then interesting to note that biomass production is approximately 270 000 TWh/year, or roughly twice as much. This shows that biomass is not a marginal energy resource but more than enough to cover all our needs for both energy and food, if just the biomass is used efficiently. There has been a lot of discussion about using food for energy. This is quite relevant, and if we look at all resources like agricultural and forestry waste, the need to use food for energy is not needed. We can cover all our needs anyhow. The resources we have available and some other aspects like using the energy efficiently is covered in this book. One way of using energy efficiently is to use waste biomass or cellulosic materials in bio refineries, where production of fibers and products from fibers is combined with production of most chemicals we need in our daily life. This includes clothes, soap, perfume, medicines etc. Conventional pulp and paper applications are also covered. But it also includes bio-fuel for vehicles and even fuel for aviation is covered. It also includes production of heat, cool and electricity. That is, biomass can cover all our needs. The difficulty is to use the resources efficiently without harming the productivity long term. This book has the aim to give facts and inspiration to professionals like engineers and researchers, students as well as those working for different type of authorities or societal organizations.

  • 28.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    COMBINATION OF STATISTICAL AND PHYSICAL MODELS FOR MODEL BASED CONTROL AND DECISION SUPPORT IN PULP AND PAPER INDUSTRY2007Other (Refereed)
  • 29.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Energy, different forms2017In: Natural Resources Available Today and in the Future: How to Perform Change Management for Achieving a Sustainable World, Springer International Publishing , 2017, p. 245-264Chapter in book (Other academic)
  • 30.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Energy resources and regional balances2017In: Natural Resources Available Today and in the Future: How to Perform Change Management for Achieving a Sustainable World, Springer International Publishing , 2017, p. 157-179Chapter in book (Other academic)
  • 31.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Environment friendly contribution of the microbes to energy conversion2016In: Microbiological Industrial Hygiene, Nova Science Publishers, Inc. , 2016, p. 349-359Chapter in book (Other academic)
    Abstract [en]

    There is enough biomass annual growth to replace all fossil fuels used principally. Still, only a small portion of this is actually used efficiently. In this chapter we discuss the resources and how they can be utilized in different ways. Especially use in bio-refineries is discussed, where both full scale plants and future directions is addressed. Concerning future directions for bio-refineries an EU project ABOWE demonstrated how organic waste can be used for production of chemicals like 2,3-butanediol, valeric acid, hydrogen and other organic acids. After this crops for food is discussed and how waste from agriculture can be utilized as source for production of the chemicals and crops with different metabolic paths are discussed briefly, C3, C4 and CAM crops. C3 crops are the most common while C4 and CAM have more efficient systems for CO2 fixation and also have much higher efficiency from sun to chemicals. Also other applications are presented like extraction of metals using microorganisms and production of meat replacement using fungi. Finally obstacles for the efficient utilization of biomass are discussed. 

  • 32.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Experience from on-line applications of process simulation in P&P industry.2007Conference paper (Refereed)
  • 33.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Från industri till akademi2013In: Bilden av ingenjören / [ed] Yvonne Eriksson och Ildiko Asztalos Morell, Stockholm: Carlsson , 2013, 1, p. 116--129Chapter in book (Refereed)
    Abstract [sv]

    Ingenjörens roll i samhället. Genusaspekter, historiska orsaker, internationella och nationella perspektiv.

  • 34.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    How to become independent of fossil fuels in Sweden2008Conference paper (Refereed)
    Abstract [en]

    Sweden has got the toughest demand in the whole of Europe recently. In 2020 minimum 49 % of the energy should be renewable energy. To achieve the goal biogas production is being optimized, utilizing organic wastes and crops, to produce methane for cars and buses. In Vasteras a 200 MW waste gasification plant will be built to replace coal in an existing 600 MW PC-boiler with biogas. The plant will start up 2011. There will be co-firing with also peat, aside of the biogas. In Sweden 120 TWh/y of biomass is consumed, which is almost 1/3 of the total 400 TWh energy utilized annually. Most of it is used in co-generation (CHP) or pulp and paper industry. Now the plan is to increase production of liquid fuels for vehicles. Energy balances for production of bio ethanol in Sweden will be discussed. This can be an interesting part of poly-generation systems. Plug-in hybrid car are foreseen to be introduced on a large scale within the next 10 years. Here liquid fuels are used in a combustor with e.g. a turbine and generator primarily to produce electricity, while electric engines fed by electricity from batteries drive the vehicle. Today 60 % of the new cars are "environmental", that is low consuming diesel, ethanol or biogas. Seven years ago it was only 5 % of the new cars! Cities, county authorities and government are working together with companies and universities to drive the transfer away from fossil fuels.

  • 35.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    How to communicate in a more efficient way over long distances2007Conference paper (Refereed)
  • 36.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    How to develop a sustainable fossil fuel free Stockholm-Malardalen region2010In: World Renewable Energy Congress XI 25-30 September 2010, Abu Dhabi, UAE / [ed] Ali Sayigh, Abu Dhabi: WREC/WREN , 2010Conference paper (Refereed)
    Abstract [en]

    First the energy balance of today is determined in a way that is possible to follow up from year to year. The second phase is to determine what available renewable energy resources we have and how these can be utilised. Hydro power already gives 5 TWh/y in the region, but new resources and enhancements of the existing as different wastes and crops are reviewed. The possibility to use solar power and TPV (Thermo Photo Voltaic) is discussed. Next step is to make a scenario for how to reach a consumption that is less than the available resources, and here different consumption patterns as well as ways to change these are considered. Energy efficient buildings and smart homes can give major impact on one of the major needs as heating is of major importance winter time, and cooling summer time. The pros and cons for different solutions are discussed.

     

  • 37.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    HOW TO MAKE A REGION FOSSIL FUEL FREE – ENERGY CONSERVATION COMBINED WITH BIOGAS PRODUCTION FROM CROPS AND WASTE2010In: 5th International Ege Energy Symposium and Exhibition (IEESE-5), 27-30 June 2010, Pamukkale University, Denizli, Turkey / [ed] Ibrahim Dincer, 2010Conference paper (Refereed)
    Abstract [en]

    In Malardalen, Sweden a work is on-going to drive the region towards becoming fossil fuel free. To get rid of coal a decision has been made to build a waste combustion plant. The plant will have a fuel capacity of 200 MW thermal. There are also a number of biogas plants. One is recycling all the organic waste in the region, and combining with crop residues from the farmers. With planned expansions we will produce some 7 million Nm3/y, corresponding to some 9-10 MW HHV. This would make a total of some 500 GWh/y. Today the total consumption of fuels for vehicles is 2 TWh. With new technologies for cars and other vehicles we could take the consumption down to at least some 1 TWh/y. The methane then would cover 50% of the need. To this we add some 0.25 TWh extra electricity for cars used primarily in cities. Possibilities to reduce energy consumption and build renewable power like wind and solar power for both Sweden and EU27 is also discussed, where a special emphasis is made on possibilities to reduce energy consumption in process industries like metal, pulp and paper and cement. This includes increasing production efficiency by using on-line applications of simulation models. This also includes power plants. The conclusion is that it is possible to reach a balance in Malardalen region including Stockholm, and with a total of 3 million people, but also all Sweden.

  • 38.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    How to reach a global energy balance with only renewable energy sources2012In: World Renewable Energy Forum, WREF 2012, vol. 6, 2012, p. 4644-4651Conference paper (Refereed)
    Abstract [en]

    An overview of population distribution, economy, crop production, forestry and use of energy in the countries of the world is first presented. From this an estimate is made of the present situation and possible potential production of biomass for different geographic and economic zones. This is complemented with potential for wind, solar and hydro power. Next the present use of energy is given and the potential for future new energy technologies for both production of electricity and saving potential for energy in industry, transportation, offices and households. The balance between production and consumption is discussed with the perspective of long term production possibilities without destroying nature. Means to sustain agriculture long term by better use of fertilizers is one aspect discussed and exemplified. Some specific technologies are discussed more in detail like biogas production from house hold waste and crop waste; high temperature gasification of biomass to produce methane in combination with large scale CHP; TPV (Thermo Photo Voltaic) where electricity is produced from biomass at the same time as heating and cooling is implemented for small scale applications. The potential for covering house roofs with solar cells and implement energy efficient buildings and smart grids are other aspects, as well as systems for electric and hybrid electric vehicles using biogas as fuel.

  • 39.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Impact on climate and environment2017In: Natural Resources Available Today and in the Future: How to Perform Change Management for Achieving a Sustainable World, Springer International Publishing , 2017, p. 265-268Chapter in book (Other academic)
  • 40. Dahlquist, Erik
    Measurement and Models2013In: Reference Module in Earth Systems and Environmental Sciences, Elsevier, 2013Chapter in book (Other academic)
    Abstract [en]

    In environmental science and engineering, we need both relevant measurements and mathematical models describing relations between measurements and chemical/biological reactions taking place in conversion processes and nature. This article gives a very short summary of suitable measurement methods and different modeling methods. Also, the use of measurements together with models is discussed. These are exemplified with improved process understanding, diagnostics, advanced control, and optimization.

  • 41.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    MODELLING AND CONTROL OF A DRY BLACK LIQUOR GASIFICATION PROCESS2006Conference paper (Refereed)
  • 42.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Modelling and design of a dry black liquor gasification process2006In: Proceedings of IFAC, ALSIS06, Helsinki, 2006, p. 64-69Conference paper (Refereed)
    Abstract [en]

    The purpose of this paper is to present modelling and design of a new type of black liquor gasification process with significant benefits compared to existing Tomlinson boilers and wet gasification processes. The organics are gasified by mainly steam reforming, as the temperature is relatively low (below 850 °C) and the water content of the black liquor relatively high (> 20 % water). The gasification can be with or without direct caustization. Sulphates are reduced to first Na2S, and then most of the sulphur is evaporated as H2S (Hydrogen sulphide), after reaction with CO2 + H 2O.The hydrogen sulphide is absorbed in a and used for preimpregnation of the wood chips, to give modified cooking with stronger and brighter fibres out from the digester. With TiO2 added, sodium carbonate is converted into Na2O.TiO2, which dissolved in water gives 4 NaOH + Na2O.(TiO2)3. The direct caustization makes the lime kiln unnecessary. The gas may be combusted in a gas turbine /steam turbine cycle, to produce 2-3 times more electricity than conventional recovery boilers, that is an electrical efficiency of 30-35.

  • 43.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Nonorganic and fossil resources: Known and estimated resources2017In: Natural Resources Available Today and in the Future: How to Perform Change Management for Achieving a Sustainable World, Springer International Publishing , 2017, p. 181-205Chapter in book (Other academic)
  • 44.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Population development, demography and historical perspective2017In: Natural Resources Available Today and in the Future: How to Perform Change Management for Achieving a Sustainable World, Springer International Publishing , 2017, p. 73-92Chapter in book (Other academic)
  • 45.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    PROCEEDINGS FROM SCIENTIFIC CONFERENCE ON GREEN ENERGY AND IT2008Conference proceedings (editor) (Other academic)
    Abstract [en]

    Scientific session on Energy saving and Green energy

    Chairman: Erik Dahlquist, Mälardalen University

    1. Investigations on CO2 absorption using amine solvents in hollow fiber membrane contactors by experiments .

    Yuexia Lv1, Xinhai Yu1*, Shan-tung Tu1, J. Yan2, E. Dahlquist2,School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; 2. Dept. IST, Mälardalen University, Västerås, Sweden

    2. Intensification of transesterification for synthesis of biodiesel using microchannel reactors.

    Zhenzhong Wen1, Xinhai Yu1*, Shan-tung Tu1, J. Yan2, E. Dahlquist2 1. School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; 2. Dept. IST, Mälardalen University, Västerås

    3. Continuous bioethanol production by fermentation

    . Bernt Lie, Juan I. Videla.Telemark University College, Porsgrunn, Norway

    4. Optimization and Economic Analysis of Marnoch Thermal Energy Conversion System,

    C.C. Chukwu1, G.F Naterer2, M.A. Rosen3, E. Dahlquist4 I.A Marnoch5 ,1,2,3,4 University of Ontario Institute of Technology, Oshawa. Ontario, Canada, 4 Malardalen University, Vasteras Sweden, 5 Marnoch Thermal Power Inc. Toronto, Ontario, Canada,

    5. Analysis of the coal based polygeneration system of hybrid type

    Guoqiang Zhang1,2, Lin GAO1, Hongguang JIN1,* 1 Institute of Engineering Thermophysics, Chinese Academy of Sciences

    6. Power transformer parameters identification using extended kalman filter

    Kourosh Mousavi Takami, TDI researcher and phd student in Malardalen University , Jafar Mahmoudi , Erik Dahlquist, Malardalen University

    7. An advanced energy saving method for Aluminium - iron - copper bonding using explosive welding

    Scientific session on Energy savings in houses

    Chairman: Jurek Pyrko, Lund University

    . Mohammad Tabatabaee. TDI institute, Teheran, Iran and Mälardalen University

    8. Design of hot water user profiles for Swedish households based on time diaries.

    751 21 Uppsala, Sweden

    Magdalena Lundh, Ewa Wäckelgård, Kajsa Ellegård. Department of Engineering Sciences The Ångström Laboratory Box 534

    9. Modeling Household Electricity Load from Time-Use Data

    . Joakim Widén, Kajsa Ellegård och Ewa Wäckelgård. Department of Engineering Sciences,Solid State Physics,Uppsala University

    10. Investigation of electricity consumption in single houses with electrical heating alone and together with complementary heating systems

    . Cajsa Bartusch, Fredrik Wallin, Erik Dahlquist, Mälardalen University.

    11. Differences in electricity and hot water consumption in apartments of different sizes.

    Iana Vassileva, Cajsa Bartusch, Erik Dahlquist. Mälardalen University.

    12. Novel Architect Designs Energy-Saving Iranian Homes

    . S.M. Esmail Mousavi-Takami, TDI Technical Development Institute, Teheran, Iran

    13. Inform me please! - Energy use information to households and Demand Response

    . Jurek Pyrko, Energy Sciencees, Lunds University

    14. "Consumers, energy and IT. IT and other tools to support efficient energy consumption"

    I.C. MariAnne Karlsson Chalmers University of Technology, Product and Production Development

    15. Influence of Residential Ventilation on Radon Mitigation with Energy Saving emphasis

    Keramatollah Akbari, Mälardalen University and TDI in Teheran, Iran

    16

    . Extracting alumina from bauxite ore in jajarm factory process simulation using aspen software

    Mohammad Farrokh and Jafar Mahmoudi, Mälardalen University and TDI in Teheran, Iran

    17. Description of techniques for hot spot monitoring and detection in power transformers

    Hassan gholinejad, Kourosh Mousavi Takami and Jafar Mahmoudi, Mälardalen University and Tanesh Company, Iran

  • 46.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Process simulation for Pulp and Paper Industries:Current practice and future trend2008In: Chemical Product and Process Modeling, ISSN 1934-2659, Vol. 3, no 1Article in journal (Refereed)
  • 47.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Regional fossil free energy systems2007In: IGEC III Conf, 2007Conference paper (Refereed)
  • 48.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Technologies for Converting Biomass to Useful Energy: combustion, gasification, pyrolysis, torrefaction and fermentation2013Collection (editor) (Refereed)
    Abstract [en]

    Officially the use of biomass for energy use globally is only 10-13 % of the total energy demand of 140 000 TWh/y. Still, the production of biomass annually is in the range of 270 000 TWh/y. Most of it obviously is not used very efficiently, although some is also used as food. There is thus a need for new methods for converting biomass into refined products like chemicals, fuels, wood and paper products, heat, cooling and electric power. The different type of conversion methods covered is biogas production, bio-ethanol production, torrefaction, pyrolysis, high temperature gasification and combustion. These methods are covered as well as principals for controlling the processes. The suitability for the different methods for different type of biomass as well as different versions of the methods is presented – both existing methods and those being developed for the future. System optimization using modeling methods and simulation is covered as well as analysis of advantages of different solutions. Many key-experts from all over the world are presenting the keys of their specialties to give us an up-to-date view of the situation all over the world. This book has the aim to give facts and inspiration to professionals like engineers and researchers, students as well as those working for different type of authorities or societal organizations.

  • 49.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    the 52 nd International Conference of Scandinavian Simulation Society: SIMS 20112011Conference proceedings (editor) (Refereed)
    Abstract [en]

    The 52nd conference on mathematical modeling of proceses. 20 papers.

  • 50.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Use of process simulation in pulp and paper industry2008Collection (editor) (Other (popular science, discussion, etc.))
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