Heat exchanger having a plurality of heat exchange tubes

Abstract

A heat exchanger is provided which may include a first heat exchange tube in a pipe shape, including a first fluid inlet, into which a first fluid may be introduced and flow, and a first fluid outlet, through which the first fluid may be discharged; a second heat exchange tube that passes through the first heat exchange tube, including a second fluid inlet, into which a second fluid may be introduced and flow, and a second fluid outlet, through which the second fluid may be discharged; and a third heat exchange tube that includes a third fluid inlet, into which the second fluid discharged through the second fluid outlet may be introduced and flow, and a third fluid outlet, through which the second fluid may be discharged, the third fluid outlet enclosing an external surface of the first heat exchange tube.

What is claimed is: 
     
         1 . A heat exchanger, comprising:
 a first heat exchange tube including a first fluid inlet, into which a first fluid is introduced, and a first fluid outlet, through which the first fluid is discharged;   a second heat exchange tube that passes through the first heat exchange tube and into which a second fluid is introduced, the second heat exchange tube including a second fluid outlet, through which the second fluid is discharged;   a third heat exchange tube into which the second fluid is introduced and which encloses an external surface of the first heat exchange tube and communicates with the second heat exchange tube, including a third fluid outlet, through which the second fluid is discharged;   a connection tube that connects the second and third heat exchange tubes; and   a second fluid inlet tube, which is connected to the connection tube to provide the second and third heat exchange tubes with the second fluid and to allow a moving direction of the second fluid in the second heat exchange tube to be the same as that in the third heat exchange tube.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the second heat exchange tube includes one of a straight tube section disposed in the first heat exchange tube, a bent tube section that is bent at least once disposed in the first heat exchange tube, or a curved tube section that is curved at least once at a predetermined curvature disposed in the first heat exchange tube. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein the first fluid has a first temperature, and the second fluid has a second temperature which is lower than the first temperature. 
     
     
         4 . A heater comprising the heat exchanger according to  claim 1 . 
     
     
         5 . A cooler comprising the heat exchanger according to  claim 1 . 
     
     
         6 . An evaporator comprising the heat exchanger according to  claim 1 . 
     
     
         7 . A condenser comprising the heat exchanger according to  claim 1 .