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Multi-stage honeycomb heater

  • US 5,465,573 A
  • Filed: 07/16/1993
  • Issued: 11/14/1995
  • Est. Priority Date: 07/29/1992
  • Status: Expired due to Term
First Claim
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1. A multi-stage honeycomb heater for heating fluid flowing therethrough, comprising:

  • at least two honeycomb heaters electrically connected with each other to enable simultaneous energization of said at least two honeycomb heaters, which are disposed along a stream of fluid and include a furthest upstream honeycomb heater and an adjacent honeycomb heater which is adjacent to and downstream of the furthest upstream honeycomb heater;

    each of said at least two honeycomb heaters having a honeycomb structure comprised of an electrically conductive material, the honeycomb structure having a periphery and two ends, including a plurality of passages which are defined by partition walls and extend in an axial direction between the ends;

    the honeycomb structure of the furthest upstream honeycomb heater having at least one member selected from the group consisting of means for adjusting an electrical resistance of the honeycomb structure and means for adjusting a heat capacity of the honeycomb structure so that the ratio of applied power to heat capacity of the furthest upstream honeycomb heater is larger than the ratio of applied power to heat capacity of the adjacent honeycomb heater when said furthest upstream and adjacent honeycomb heaters are simultaneously energized.

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