Fin structure, heat-transfer tube having the fin structure...

Heat exchange – With agitating or stirring structure

Reexamination Certificate

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C165S183000

Reexamination Certificate

active

11221235

ABSTRACT:
A fin structure, a heat-transfer tube and a heat exchanger are formed of plate fins housed in a heat-transfer tube and have an excellent cooling efficiency by making the distribution and flow velocity of a flow uniform and by promoting an efficient heat-exchanging action. The fin structure includes plate fins housed in a heat-transfer tube and having a square section and a free shape in the longitudinal direction for dividing a passage for a fluid composed of a cooled medium or a cooling medium to flow in the heat-transfer tube, into a plurality of small passages. In the fin structure, notches, through holes, raised portions, ridges and/or troughs are formed in the sides or the upper or lower walls of the plate fins. The heat-transfer tube has the fin structure housed therein. The heat exchanger has the heat-transfer tube assembled therein.

REFERENCES:
patent: 3451473 (1969-06-01), Urie et al.
patent: 3521707 (1970-07-01), Brown
patent: 3636607 (1972-01-01), DeMarco
patent: 4059882 (1977-11-01), Wunder
patent: 5560424 (1996-10-01), Ogawa
patent: 2002/0174979 (2002-11-01), Haegele et al.
patent: 2004/0099408 (2004-05-01), Shabtay et al.
patent: 11-23181 (1999-01-01), None
patent: 2000-111277 (2000-04-01), None
patent: 2002-107091 (2002-04-01), None

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