Multi-pipe heat exchanger apparatus and method of producing...

Heat exchange – Casing or tank enclosed conduit assembly – Manifold formed by casing section and tube sheet of assembly

Reexamination Certificate

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Details

C165S125000, C029S890030

Reexamination Certificate

active

11317823

ABSTRACT:
In a heat exchanger, a plurality of heat conductive pipes forming first passages are provided between an outer wall plate and an inner wall plate. Air flows through the first passages. Second passages are formed between the heat conductive pipes. An exhaust gas flows through the second passages. Each of the heat conductive pipes has opposite walls limiting the passage width of the first passage. The walls are formed along involute curves. The second passages are formed by providing adjacent heat conductive pipes along the involute curves.

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International Search Report for Application No. PCT/JP2005/024181, dated Jul. 28, 2006.
International Preliminary Report on Patentability and Written Opinion for International Application No. PCTJP2005/024180, dated Aug. 23, 2007.

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