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2006 IEEE Instrumentation and Measurement Technology Conference Proceedings
Mälardalen University, Department of Public Technology. (PRO)
(PRO)ORCID iD: 0000-0002-3485-5440
2006 (English)In: IEEE Instrumentation and Measurement Technology Conference Proceedings, 2006, p. 175-179Conference paper, Published 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.

Place, publisher, year, edition, pages
2006. p. 175-179
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-960DOI: 10.1109/IMTC.2006.328364ISI: 000244176700033Scopus ID: 2-s2.0-36048959237ISBN: 978-0-7803-9359-2 (print)OAI: oai:DiVA.org:mdh-960DiVA, id: diva2:161
Conference
23rd IEEE Instrumentation and Measurement Technology Conference, Sorrento, ITAL, APR 24-27, 2006
Available from: 2008-09-04 Created: 2008-09-05 Last updated: 2016-06-07Bibliographically approved
In thesis
1. Water content measurement in woody biomass: using dielectric constant at radio frequencies
Open this publication in new window or tab >>Water content measurement in woody biomass: using dielectric constant at radio frequencies
2008 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The will for replacement of fossil fuels increased the use of woody biomass as fuel in heating and power plants. An important parameter for the use woody biomass as fuel is the water content of biomass as it influences the heating value and thereby the combustion control and pricing. Currently, water content is determined using the gravimetric method by drying samples  in an oven. This method is neither fast nor representative, as the water content can vary largely in different parts of the container which raised the need to develop sensors that are able to measure water content of biomass on-line and in a representative way.This thesis presents results from studies on the measurement of water content of woody biomass with radio frequency. Included are the study on the influence of temperature in the measurements, the use of dielectric mixing models to explain the dielectric behavior of woody biomass and the application of the measurement principle to full-scale.

It was found that varying temperature between 1 and 62 °C did not influence the prediction of water content in biomass. It was possible to explain the behavior of the dielectric constant of woody biomass with a model with physical basis using empirically obtained parameters. Application of the principle to full-scale had positive results but larger prediction error than laboratory-scale measurements.

Publisher
p. 57
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 90
Research subject
Energi- och miljöteknik
Identifiers
urn:nbn:se:mdh:diva-963 (URN)978-91-86135-01-0 (ISBN)
Presentation
Delta, Mälardalens högskola, Västerås (English)
Opponent
Supervisors
Available from: 2009-02-26 Created: 2008-09-05 Last updated: 2009-02-26Bibliographically approved

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Thorin, Eva

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CiteExportLink to record
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Citation style
  • apa
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  • vancouver
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Language
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  • nn-NO
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  • Other locale
More languages
Output format
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