IDEAS home Printed from https://ideas.repec.org/a/caa/jnlrae/v63y2017ispecialissueid34-2017-rae.html
   My bibliography  Save this article

Dielectric properties of hops - an effect of bulk density

Author

Listed:
  • Jakub Lev

    (Department of Physics,)

  • František Kumhála

    (Departmen of Agricultural Machines, Faculty of Engineering, Czech University of Life Sciences Prague, Czech Republic Corresponding auhtor: kumhala@tf.czu.cz)

Abstract

Continuous detection of basic physical properties of freshly picked and cleaned wet hop cones would be very helpful for better control and automation of harvesting processes. That is why the main aim of this article was to determine the effects of bulk density changes on dielectric properties of freshly picked hop cones. Relative permittivity and loss factor were measured using a newly developed capacitance measuring device. A strong linear correlation between fresh hops relative permittivity and bulk density was found. This finding could be used e.g. for consequent hop drying process control. Significant differences between tested hop varieties were observed for both relative permittivity and loss factor measurements. These differences cannot be explained only by a slightly different moisture content of the measured varieties and ambient temperature changes. Measured material loss factor was only slightly affected by bulk density changes. However, relative permittivity was affected by bulk density changes significantly. These facts could be used for other properties of wet hop cones estimation.

Suggested Citation

  • Jakub Lev & František Kumhála, 2017. "Dielectric properties of hops - an effect of bulk density," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 63(SpecialIs), pages 18-23.
    • Handle: RePEc:caa:jnlrae:v:63:y:2017:i:specialissue:id:34-2017-rae
    DOI: 10.17221/34/2017-RAE
    as

    Download full text from publisher

    File URL: http://rae.agriculturejournals.cz/doi/10.17221/34/2017-RAE.html
    Download Restriction: free of charge
    File URL: http://rae.agriculturejournals.cz/doi/10.17221/34/2017-RAE.pdf
    Download Restriction: free of charge
    File URL: https://libkey.io/10.17221/34/2017-RAE?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:caa:jnlrae:v:63:y:2017:i:specialissue:id:34-2017-rae. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Ivo Andrle (email available below). General contact details of provider: https://www.cazv.cz/en/home/ .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.