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  • 1.
    Nyström, Jenny
    Mälardalen University, Department of Public Technology.
    Fuel characterisation with radio-frequency spectroscopy2003Licentiate thesis, comprehensive summary (Other scientific)
  • 2.
    Nyström, Jenny
    Mälardalen University, Department of Public Technology.
    Methods for feed forward determination of moisture content in woodchips for power plants - state of the artIn: Fuel, ISSN 0016-2361, E-ISSN 1873-7153Article in journal (Refereed)
  • 3.
    Nyström, Jenny
    Mälardalen University, Department of Public Technology.
    Rapid measurements of the moisture content in biofuel2006Doctoral thesis, comprehensive summary (Other scientific)
    Abstract [en]

    An increasing number of power plants in Scandinavia are beginning to use biofuel instead of coal or oil. The material in the new fuel is a mixture of woodchips, mostly Pine, Spruce and Salix, bark, GROT (tops and branches from felling waste) and sawdust from sawmills. It is heterogeneous, having a moisture content varying from 15% up to 65%. The moisture content affects the combustion of the fuel and therefore its commercial value. The industry is now interested in obtaining a method for measuring the moisture content of biofuel, quickly and reliably; preferably on delivery at the power plant.

    The measuring technique presented in this thesis is the first reported in the literature capable of measuring the moisture content of a large sample of such an heterogeneous material as biofuel. The equipment is today calibrated for a sample volume of 0.1 m3. A radio frequent signal is supplied from an antenna and penetrates the biofuel. Its reflection is modeled using partial least squares.

    As part of the work presented in this thesis, a new type of measuring rig and an analysis method for measurement of the moisture content of large samples of heterogeneous material have been developed. A statistical model for moisture content measurements of five different biofuel materials using radio waves has been built, having a root mean square error of prediction of 2.7. The interactions between biofuels and radio frequent signals have been demonstrated, indicating a variation of the reflection with varying types of biofuel material and variation in the reflection and delay of the signal with varying moisture content.

  • 4.
    Nyström, Jenny
    et al.
    Mälardalen University, Department of Public Technology.
    Axrup, Lars
    Dahlquist, Erik
    Mälardalen University, Department of Public Technology.
    Långtidsutvärdering av nya on-line fukthaltsmätare för biobränsle [Long-term evalution of on-line sensors for determination of moistrue in biomass]2002Report (Other academic)
  • 5.
    Nyström, Jenny
    et al.
    Mälardalen University, Department of Public Technology.
    Dahlquist, Erik
    Methods for determination of moisture content in woodchips for power plants - a review2004In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 83, no 7-8, p. 773-779Article in journal (Refereed)
  • 6.
    Nyström, Jenny
    et al.
    Mälardalen University, Department of Public Technology.
    Franzon, Bo
    Methods for Analysis of Radio-Frequency Measurements of Moisture Content in BiofuelManuscript (Other scientific)
  • 7.
    Nyström, Jenny
    et al.
    Mälardalen University, Department of Public Technology.
    Franzon, Bo
    Radio Frequency System for Measuring Characteristics of Biofuels2005In: IMTC 2005 – Proceedings of the IEEE Instrumentation and Measurement Technology Conference Ottawa, Canada, 17-19 May 2005, IEEE , 2005, Vol. 2, p. 978-983Conference paper (Refereed)
  • 8.
    Nyström, Jenny
    et al.
    Mälardalen University, Department of Public Technology.
    Thorin, E.
    Backa, S.
    Dahlquist, Erik
    Filling level measurement in woodchips bins with radio-frequency spectroscopy2003In: Nordic seminar on thermochemical conversion of biofuels, Nov. 12, 2002, 2003Chapter in book (Other academic)
  • 9.
    Nyström, Jenny
    et al.
    Mälardalen University, Department of Public Technology.
    Thorin, Eva
    RF-Measurements of Moisture Content of Biofuel using Time Domain SignalsManuscript (Other scientific)
  • 10.
    Nyström, Jenny
    et al.
    Mälardalen University, Department of Public Technology.
    Thorin, Eva
    Backa, Stefan
    Dahlquist, Erik
    Moisture Content Measurements on Sawdust with Radio Frequency Spectroscopy2005In: Proceedings of ASME Power, Chicago, Illinois, USA, April 5-7, 2005(2005), 2005Conference paper (Refereed)
  • 11.
    Paz, Ana
    et al.
    Mälardalen University, Department of Public Technology.
    Nyström, Jenny
    Thorin, Eva
    2006 IEEE Instrumentation and Measurement Technology Conference Proceedings2006In: IEEE Instrumentation and Measurement Technology Conference Proceedings, 2006, p. 175-179Conference paper (Refereed)
    Abstract [en]

    A method that permits the determination of moisture content in biofuel in a fast and representative way is under development. Vie method uses radio frequency waves within the range of 310 MHz to 800 MHz and measures the reflection coefficient in samples with volume of about 0.1 m(3). The influence of sample temperature in the measurements is shown in this study. Two biofuel types were used, with moisture content varying between 31% and 63% and temperature varying between 1 degrees C and 63 degrees C. The data was evaluated with multivariate data analysis. Results show that it is not possible to identify the sample temperature as a principal component in a principal component analysis and partial least squares regression shows no correlation between temperature and the radio frequency data. For the frequency interval and the temperature range studied, it was not possible to detect any influence of sample temperature on moisture content prediction with the radio frequency method.

  • 12.
    Paz, Ana
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Thorin, Eva
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Nyström, Jenny
    Eskilstuna Energi och Miljö.
    Complex Permittivity of Woody Biomass at Radio FrequenciesManuscript (preprint) (Other (popular science, discussion, etc.))
  • 13.
    Paz, Ana
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Thorin, Eva
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Nyström, Jenny
    Eskilstuna Energi och Miljö.
    Dielectric Properties of Woody Biomass at Radio Frequencies2009In: Proceedings of the 8th International Conference on. Electromagnenetic Wave Interaction with Water and Moist Substances, Helsinki, 2009Conference paper (Refereed)
    Abstract [en]

    Electromagnetic sensing has been found an interesting technique for the characterization of woody biomass. The knowledge of the dielectric properties is useful for this characterization and to improve the understanding of the dielectric behavior of the material. This study presents the dielectric properties of woody biomass at a center frequency of 555 MHz. A measurement system, previously developed, to determine the water content of biomass was used. This system uses a reflection method and measures a biomass volume of about 0.11 m3. The dielectric properties were extracted from attenuation and velocity of the electromagnetic waves in three types of woody biomass with varying water content.

  • 14.
    Wang, Weilong
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Hu, Yukun
    Royal Institute of Technology, Stockholm, Sweden.
    Yan, Jinyue
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Nyström, Jenny
    Eskilstuna Energi och Miljo AB, Eskilstuna, Sweden.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Combined heat and power plant integrated with mobilized thermal energy storage (M-TES) system2010In: Frontiers of Energy and Power Engineering in China, ISSN 1673-7393, Vol. 4, no 4, p. 469-474Article in journal (Refereed)
    Abstract [en]

    Energy consumption for space heating and hot tap water in residential and service sectors accounts for one third of total energy utilization in Sweden. District heating (DH) has been used for heat supply to areas with high energy demand. However, there are still a lot of detached houses and sparse areas with no connection to a DH network where electrical heating or oil/pellet boilers are used to meet heat demand. Sometimes, extending the existing DH network to those spare areas is not economically feasible because of the small heat demands and the large investment. Mobilized thermal energy storage (M-TES) system is an alternative way to supply heat for detached buildings or sparse areas by using industrial heat. In this paper, integration of a combined heat and power (CHP) plant and an M-TES system is analyzed. The impacts of four options of the integrated system are discussed including the power and heat output in the CHP plant, as well as the performance of M-TES system.

1 - 14 of 14
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