US2011132589A1PendingUtilityA1

Heat exchanger grooved tube

Assignee: YOSHIOKA SHUNPriority: Aug 4, 2008Filed: Jul 28, 2009Published: Jun 9, 2011

Est. expiryAug 4, 2028(~2 yrs left)· nominal 20-yr term from priority

Inventors:Shun Yoshioka Hirokazu Fujino Haruo Nakata Yoshio Oritani

F28F 1/40F28F 1/10B21D 17/00B21C 1/22

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References

Claims

Abstract

A heat exchanger grooved tube is made of a copper alloy having a 0.2% proof stress of greater than or equal to 40 N/mm 2 , and the relationship among the fin width b, the number N of fins (3), and the root thickness t is represented by 8<bN/t<20.

Claims

exact text as granted — not AI-modified

1 . A heat exchanger grooved tube having an internal surface including a plurality of grooves and a plurality of projections adjacent to the grooves,
 wherein the heat exchanger grooved tube is made of a copper alloy having a 0.2% proof stress of greater than or equal to 40 N/mm 2 , and   the relationship among a width b of a root end of each of the projections, a number N of the projections, and a bottom thickness t of each of the grooves is represented by 8&lt;bN/t&lt;20.   
     
     
         2 . The heat exchanger grooved tube of  claim 1 , wherein
 the heat exchanger grooved tube is used for a refrigeration circuit through which carbon dioxide serving as refrigerant circulates and which operates in a vapor compression refrigeration cycle such that a high pressure is greater than or equal to a critical pressure of carbon dioxide.

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