Direct measurements of the magnetocaloric effect

Kaspar Kirstein Nielsen, Christian R.H. Bahl, Henrique Neves Bez, Rasmus Bjørk, Lars von Moos, Dan Eriksen

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Abstract

We present an experimental setup recently developed at DTU Energy Conversion for measuring specific heat and direct isothermal entropy change in a varying magnetic field (DSC device) using calorimetry. The device operates in high vacuum (~1e-6 mbar) and measurements are fully automated with respect to magnetic field and temperature control. A magnetic field source comprised of two concentric Halbach type magnets that are fixed with respect to each other through a mechanical gear supply the applied magnetic field. The applied field range is 0.001 to 1.57 T with a minimum field step size smaller than 0.01 T. The magnet control is fully integrated in software allowing measurement scans to be automated. This device is an upgrade of an existing device where it is now possible to install a sample and then run temperature scans at different magnetic fields (specific heat measurement) as well as magnetic field scans under isothermal conditions (direct isothermal entropy change measurements).
Original languageEnglish
Title of host publicationProceedings of the 6th IIF-IIR international Conference on Magnetic Refrigeration
Number of pages2
PublisherInternational Institute of Refrigeration
Publication date2014
Publication statusPublished - 2014
Event6th IIR/IIF International Conference on Magnetic Refrigeration - Fairmont Empress Conference Center, Victoria, Canada
Duration: 7 Sep 201410 Sep 2014
http://www.iesvic.uvic.ca/events/ThermagVI/

Conference

Conference6th IIR/IIF International Conference on Magnetic Refrigeration
LocationFairmont Empress Conference Center
CountryCanada
CityVictoria
Period07/09/201410/09/2014
Internet address

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