Double-pipe heat exchanger

Abstract

A double-pipe heat exchanger is provided. The double-pipe heat exchanger may include a first heat exchange tube having a first hollow portion, and a second heat exchange tube disposed inside the first heat exchange tube, so as to be co-axial with the first heat exchange tube and having a spiral part in which multiple ridges and grooves are formed at an inner surface of the spiral part.

1 . A double-pipe heat exchanger, comprising:
 a first heat exchange tube having a first hollow portion; and   a second heat exchange tube disposed inside the first heat exchange tube and having a spiral part in which multiple ridges and grooves are formed at an inner surface thereof.   
     
     
         2 . The double-pipe heat exchanger of  claim 1 , wherein the second heat exchange tube is disposed inside the heat exchange tube so as to be co-axial with the first heat exchange tube. 
     
     
         3 . The double-pipe heat exchanger of  claim 1 , wherein the first heat exchange tube comprises:
 a first fluid inlet port through which a first fluid is introduced into the first heat exchange tube; and   a first fluid outlet port through which the first fluid is discharged from the first heat exchange tube.   
     
     
         4 . The double-pipe heat exchanger of  claim 1 , wherein the second heat exchange tube comprises:
 a second fluid inlet port through which a second fluid is introduced into the second heat exchange tube;   a second fluid outlet port through which the second fluid is discharged from the second heat exchange tube; and   the spiral part which extends between the second fluid inlet port and the second fluid outlet port.   
     
     
         5 . The double-pipe heat exchanger of  claim 4 , wherein the second fluid inlet port extends through a first side wall of the first heat exchange tube, and the second fluid outlet port extends through a second side wall of the heat exchange tube. 
     
     
         6 . The double-pipe heat exchanger of  claim 5 , wherein the second side wall is opposite the first side wall. 
     
     
         7 . The double-pipe heat exchanger of  claim 4 , wherein the second fluid inlet pipe and second fluid outlet pipe are cylindrical. 
     
     
         8 . The double-pipe heat exchanger of  claim 1 , wherein a ratio A/W of a pitch W, which is a length between adjacent grooves of the second heat exchange tube, to a distance A between a center portion of the pitch W and a top portion P of the ridge is less than about 0.15. 
     
     
         9 . The double-pipe heat exchanger of  claim 1 , wherein the pitch W is approximately 4 mm<W<10 mm, and a height difference Hc between an adjacent ridge and groove is approximately 1 mm<Hc<3 mm. 
     
     
         10 . The double-pipe heat exchanger of  claim 1 , wherein a temperature of a first fluid provided between the first and second heat exchange tubes is different from a temperature of a second fluid provided in the second heat exchange tube. 
     
     
         11 . The double-pipe heat exchanger of  claim 5 , wherein the second fluid is one of a single-phase fluid or a two-phase fluid. 
     
     
         12 . A heater comprising the double-pipe heat exchanger of  claim 1 . 
     
     
         13 . A cooler comprising the double-pipe heat exchanger of  claim 1 . 
     
     
         14 . An evaporator comprising the double-pipe heat exchanger of  claim 1 . 
     
     
         15 . A condenser comprising the double-pipe heat exchanger of  claim 1 . 
     
     
         16 . A double-pipe heat exchanger, comprising:
 a first heat exchange tube having a first hollow portion; and   a second heat exchange tube disposed inside the first heat exchange tube so as to be coaxial with the first heat exchange tube and having a spiral part in which multiple ridges and grooves are formed at an inner surface thereof, wherein the second heat exchange tube comprises:
 a second fluid inlet port the second heat exchange tube through which a second fluid is introduced into the second heat exchange tube; 
 a second fluid outlet port through which the second fluid is discharged from the second heat exchange tube; and 
 the spiral part which extends between the second fluid inlet port and the second fluid outlet port. 
   
     
     
         17 . The double-pipe heat exchanger of  claim 16 , wherein the second fluid inlet port extends through a first side wall of the first heat exchange tube, and the second fluid outlet port extends through a second side wall of the heat exchange tube. 
     
     
         18 . A double-pipe heat exchanger, comprising:
 a first heat exchange tube having a first hollow portion; and   a second heat exchange tube disposed inside the first heat exchange tube so as to be coaxial with the first heat exchange tube and having a spiral part in which multiple ridges and grooves are formed at an inner surface thereof, wherein the pitch W, which is a length between adjacent grooves of the second heat exchange tube, is approximately 4 mm<W<10 mm, and a height difference Hc between an adjacent ridge and groove is approximately 1 mm<Hc<3 mm.