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  • 101.
    Wallin, Fredrik
    Mälardalens högskola, Institutionen för samhällsteknik.
    Added Values of Remote Collected Electricity Consumption Data: Software Solutions for Demand-Side Management2005Licentiatavhandling, med artikler (Annet vitenskapelig)
  • 102.
    Wallin, Fredrik
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik.
    Bartusch, Cajsa
    Mälardalens högskola, Institutionen för samhällsteknik.
    Thorin, Eva
    Mälardalens högskola, Institutionen för samhällsteknik.
    Bäckström, Tobias
    Smedjebacken Energi Nät AB.
    Dahlquist, Erik
    Mälardalens högskola, Institutionen för samhällsteknik.
    The Use of Automatic Meter Readings for a Demand-Based Tariff2005Inngår i: Proceedings of the 2005 IEEE/PES Transmission and Distribution Conference & Exhibition: Asia and Pacific, 2005, s. 1-6Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A determining factor for a successful implementation of a demand-based pricing model or control strategy in electricity markets is not only the effects of peak load management, but also the financial consequences for the utility operator and the end customer. In this economic modelling a subset of 460 residential customers has been implemented in a software tool analysing the economic outcome of three different tariffs. Two demand-based tariffs were investigated and compared with a traditional energy-based tariff. The demand-based tariffs transform the flat income curve into a more complex, due to a stronger economic dependency to the system peak loads. The demand-based tariffs move the revenues to the high-peak period, November – March, and the utility operator gains a good matching between system peaks and distribution of incomes.

  • 103.
    Wallin, Fredrik
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik.
    Dahlquist, Erik
    Mälardalens högskola, Institutionen för samhällsteknik.
    A Web-Based Dynamic Simulator For Applications In Process Industry And For Education.2002Inngår i: Proceedings of the 43rd Conference on Simulation and Modelling: SIMS 2002, 2002, s. 151-158Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a project with a purpose to develop an energy process simulator with a Web-based interface. The advantage with a Web-based interface is that the user can access simulation tools with only a Web browser. The cost for any organisation would also be reduced due to smaller fees and less maintenance time as only a central server needs to be updated. The system architecture has been divided into three major parts; Graphical User Interface (GUI), storage of data and calculating applications. This object-oriented design has shown to be very useful due to its high flexibility. Two different pplications are described in the paper; one energy model used to simulate an energy process and one system with remote electricity data collection (both power and energy) and processing, both displaying the results in a Web-based GUI. The two applications have recently been evaluated with a promising result and will therefore form the basis for future research projects.

  • 104.
    Wallin, Fredrik
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik.
    Dahlquist, Erik
    Mälardalens högskola, Institutionen för samhällsteknik.
    Ekwall, Håkan
    ABB Industry, Västerås, Sweden.
    Dynamic simulators for process control and optimization as well as for operator training in pulp and paper industry2002Inngår i: Proceedings of the 43rd Conference on Simulation and Modelling: SIMS 2002, 2002Konferansepaper (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    By using a dynamic physical model, that is adapted to real process data, robust mathematical process models can be created. By doing this it is possible to build in process know how from many different sources, and also to include factors, that are not easy to measure. From the dynamic model a training simulator can be made. From the dynamic model it may also be possible to do a model reduction to get an MPC, a Model Predictive Control. Data reconciliation is needed, to keep control of the measurements of all kind. A decision support system keeps control over the process status, to support operators. The production is also optimized at several levels. These functions may also be achieved by using principally the same mathematical models and algorithms.

  • 105.
    Wang, Chuan
    et al.
    Luleå University of Technology, Luleå, Sweden.
    Zeng, Lei
    Luleå University of Technology, Luleå, Sweden.
    Yan, Jinyue
    Mälardalens högskola, Institutionen för samhällsteknik.
    Lundgren, Joakim
    Luleå University of Technology, Luleå, Sweden.
    Potential Carbon Dioxide Emission Reduction in China by Using Swedish Bioenergy Technologies2006Inngår i: GHGT-8 Conference, 19-22 June 2006Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    During recent years, an increased attention has been given by industries and governments from industrialized as well as developing countries to reduce greenhouse gas (GHG) emissions through the clean development mechanism (CDM). As China has increasing demands on bioenergy and Sweden has good practices and competence in developing and utilizing bioenergy technologies, this paper studies the resulting consequence if implementing Swedish bioenergy technologies in China. The potential CO2 emission reduction from each technology in China is studied. A few priority areas for future CDM projects selection by using Swedish technologies are recommended.

  • 106.
    Wennström, Lina
    Mälardalens högskola, Institutionen för samhällsteknik.
    En analys av Eurokod 1990: - användarråd, jämförelser samt en intervjuundersökning2008Oppgave
    Abstract [en]

    The EN Eurocodes are a new series of standards for construction design in Europe. The development of these codes started originally in 1975 and in present time the progressing work is at the national calibration stage. The goal is to create a common standard for the design of buildings and other civil engineering works throughout Europe and beyond. The purpose is to increase the free circulation of construction products and engineering services. Since the transition to the new standards is getting closer, the constructing engineers and companies will soon stand before great changes. This is why Kadesjös Ingenjörsbyrå AB asked me to do an analysis of the first part of the new standard, i.e. Eurocode 1990, and look at the differences among the existing standards in Sweden and the Eurocodes. The result of this is summarized not only in the report but also in a “User’s manual” which is presented in appendix 1 attached to the report. A limited study of the environmental effects of the transition to Eurocode EN 1990 has also been done. By comparing design calculations of a normal beam in three different materials, steel, concrete and glued laminated timber, one can, for instance, get a general view of how the differences of the two standards affect the required quantity of material. To get an insight of the different opinions that might exist concerning the new standard, a survey based on interviews of a few constructional engineers has been done. There was also discussed if any, and in that case what kind of preparations constructors and design companies are performing to be well prepared when the transition comes.

  • 107.
    Widarsson, Björn
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik.
    Karlsson, Christer
    Mälardalens högskola, Institutionen för samhällsteknik.
    Dahlquist, Erik
    Mälardalens högskola, Institutionen för samhällsteknik.
    Bayesian Network for Decision Support on Soot Blowing Superheaters in a Biomass Fuelled Boiler2004Inngår i: 2004 International Conference on Probabilistic Methods Applied to Power Systems, 2004, s. 212-217Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    In a process for combined heat and power generation there is a need for fault detection, decision support and risk assessment to prevent operational disturbances and reduction in performance. A method to achieve decision support is to use Bayesian networks, where knowledge about the process is combined with operational experience. The network covers the convectional superheaters in the flue gas train, which is a major problem domain in biomass-fuelled boilers. The superheaters are exposed to fouling from flue gases. Fouling reduces the heat transfer and result in a decreased power plant performance. The Bayesian network is constructed to give decision support on preventive action to reduce abnormal fouling. Validation of the Bayesian network show that the prediction of hard fouling works well under uncertainty.

  • 108.
    Zeng, Lei
    Mälardalens högskola, Institutionen för samhällsteknik.
    Clean development Mechanism (CDM) Policy and Implementation in China2006Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    China is the second largest emitter of greenhouse gases (GHG) in the world. Since 68% of its primary energy is from coal, China’s average energy intensity is 7.5 times higher than the EU and 4.3 times higher than the US (EU, 2003). Therefore, introducing advanced clean technologies and management to China represents opportunities for Annex I countries to obtain low-cost CERs through CDM projects, and access to one of the largest energy conservation markets in the world.

    The Chinese government considers that the introduction of CDM projects can bring advanced energy technologies and foreign investment to China, thereby helping China’s sustainable development. As energy efficiency is generally low and carbon intensity is high in both China’s energy supply and demand sectors, numerous options exist for cost-effective energy conservation and GHG mitigation with CDM.

    This study has focused on the following areas:

     Clean development Mechanism (CDM) Policy and Implementation in ChinaClean development Mechanism (CDM) Policy and Implementation in ChinaChina’s energy development strategy and climate change, how to make CDM work for sustainable development in China?

     CDM projects in China: policies assessment and recommendations for improvement.

     Energy efficiency CDM projects and renewable CDM projects in China: case studies

    Firstly, this thesis reviewed the current CDM developments in China, attentions were given to the renewable energy, energy efficiency and methane capture project opportunities in China.

    Secondly, this study introduced China’s current policy on CDM implementation, and reviewed its permission requirements, institutional arrangements and project procedures. Based on the observations, this study analyzed the current problems and pointed out the shortfalls of the existing Chinese CDM policies and institutional settings. Options to remove these barriers were given as recommendations. This thesis also looked at the problem of that CDM was designed to have double dividends, to reduce the compliance cost of the Annex I countries and to contribute to sustainable development in Non Annex I Parties, but in reality, CDM has caused concerns about whether it could really support sustainable development in host countries. This study analyzed the reasons underpin this problem.

    Thirdly, based on the analysis made on energy efficiency and renewable CDM project development in China, case study was given on China’s landfill gas to energy project. This study analyzed the perspective of GHG mitigation through landfill gas capture and utilization in China, its opportunities and challenges. Moreover, this study demonstrated how CDM can add value to landfill gas-to-energy projects in China.

  • 109.
    Zeng, Lei
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik.
    Wang, Chuan
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Develop Landfill Gas-to-Energy Project under CDM in ChinaManuskript (Annet vitenskapelig)
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