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Fundamentals of Electroheat pp 287–352Cite as

Direct Resistance Heating

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Abstract

This chapter deals with Direct Resistance Heating (DRH) installations used for heating electrical conductive materials, metallic or non-metallic, by means of an electrical current flowing directly in the workpiece to be heated. According to the process technological requirements, the installation can be with still or moving workpieces and DC or AC supply at convenient frequency (mostly 50 Hz). The chapter is subdivided into four paragraphs. The first paragraph deals with installations with DC supply: the basic equations are first given, then the influence of variations material characteristics with temperature and the heating transient in the workpiece are analyzed. In the second paragraph installations with AC supply are considered, analyzing current and power density distributions in the workpiece, heating transients in non-magnetic and magnetic materials, efficiency and energy consumption. The third paragraph deals with the equivalent circuit of DRH installations and the calculation through numerical models of the influence of the installation design on the transient temperature distribution in steel bars. In the fourth paragraph data for DRH of tubes, bars with rectangular or square cross-section and continuous heaters for metal wires and strips are presented.

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Authors and Affiliations

  1. University of Padua, Padova, Italy

    Sergio Lupi

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  1. Sergio Lupi
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Correspondence to Sergio Lupi .

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Lupi, S. (2017). Direct Resistance Heating. In: Fundamentals of Electroheat. Springer, Cham. https://doi.org/10.1007/978-3-319-46015-4_5

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  • DOI: https://doi.org/10.1007/978-3-319-46015-4_5

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-46014-7

  • Online ISBN: 978-3-319-46015-4

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