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Heater apparatus and process for heating a fluid stream with PTC heating elements electrically connected in series

  • US 5,471,034 A
  • Filed: 03/17/1993
  • Issued: 11/28/1995
  • Est. Priority Date: 03/17/1993
  • Status: Expired due to Fees
First Claim
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1. Heater apparatus for heating a fluid passing through said heater at a selected flow rate comprising first and second elongated frame members, the frame members each formed with a recess aligned with and facing one another and forming a flow passage having an inlet and outlet,a plurality of pairs of electrically conductive heat transfer members having opposite distal end portions received in the respective recesses of the frame members, the heat transfer members each configured to define a plurality of fluid receiving passages communicating with the inlet and outlet of the flow passage, a plurality of standard self-regulating electrical resistance heater elements having opposed upper and lower electrically conductive surfaces, at least one heater element disposed between each pair of heat transfer members, with the upper and lower electrically conductive surfaces thereof in electrical engagement with respective heat transfer members of a pair and having thermally conductive grease placed between the heater elements and contiguous heat transfer members;

  • andelectrical terminals, connected to said heater elements, said heater elements electrically connected in series.

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