Heat transfer tube and heat exchanger using same

Abstract

A heat transfer tube is formed with a corrugated water tube to be used in a heat exchanger, and satisfying 0.04≦Hc/OD, where Hc is the corrugated groove depth of the corrugated tube and OD is the corrugation outside diameter thereof.

1 . A heat transfer tube, comprising:
 a corrugated water tube to be used in a heat exchanger, and satisfying 0.04≦Hc/OD, where Hc is a corrugated groove depth of the corrugated tube and OD is a corrugation outside diameter thereof.   
   
   
       2 . The heat transfer tube according to  claim 1 , wherein:
 0.04≦Hc/OD≦0.1.   
   
   
       3 . The heat transfer tube according to  claim 1 , wherein:
 a twist angle βc defined between a corrugated groove of the corrugated tube and a tube axis thereof is βc≧40°.   
   
   
       4 . A heat exchanger, comprising:
 a heat transfer tube comprising a corrugated water tube to be used in a heat exchanger, and satisfying 0.04≦Hc/OD, where Hc is a corrugated groove depth of the corrugated tube and OD is a corrugation outside diameter thereof.   
   
   
       5 . The heat exchanger according to  claim 4 , further comprising:
 an outer tube provided outside of the heat transfer tube that is used as an inner tube, the heat exchanger formed so that a refrigerant flows through an annular portion between the heat transfer tube and the outer tube.   
   
   
       6 . The heat exchanger according to  claim 4 , further comprising:
 a plain tube sheathed on the heat transfer tube to form a leak detection portion; and   an outer tube arranged outside of the plain tube, the heat exchanger formed so that a refrigerant flows through an annular portion between the plain tube and the outer tube.   
   
   
       7 . The heat exchanger according to  claim 5 , wherein:
 the outer tube comprises a corrugated tube.   
   
   
       8 . The heat exchanger according to  claim 6 , wherein:
 the outer tube comprises a corrugated tube.   
   
   
       9 . A heat exchanger, comprising:
 a heat transfer tube comprising a corrugated water tube to be used in a heat exchanger, and satisfying 0.04≦Hc/OD, where Hc is a corrugated groove depth of the corrugated tube and OD is a corrugation outside diameter thereof; and   a refrigerant-conducting heat transfer tube wound around on the heat transfer tube.