Multipath cross flow heat exchanger

Abstract

The present invention relates to a multipath cross flow heat exchanger and, more particularly, to a multipath cross flow heat exchanger, capable of preventing degradation of the cooling performance for cooling a superconductor which may occur when circulation of liquid nitrogen in a circulation tube is not efficient, by forming a cooling tube, in which a refrigerant for cooling liquid nitrogen flows, to intersect multiple times with the circulation tube, in which the liquid nitrogen is circulated, to thereby freeze the liquid nitrogen by the refrigerant.

What is claimed is: 
     
         1 . A multipath cross flow heat exchanger comprising:
 a circulation tube in which cooling fluid for cooling a superconducting cable flows; and   a cooling tube defining a flowing path intersecting the circulation tube multiple times and in which a refrigerant that exchanges heat with the cooling fluid flows.   
     
     
         2 . The multipath cross flow heat exchanger of  claim 1 , wherein the circulation tube and the cooling tube intersect each other while being isolated from each other so that the cooling fluid in the circulation tube and the refrigerant in the cooling tube are prevented from being mixed together. 
     
     
         3 . The multipath cross flow heat exchanger of  claim 1 , wherein the cooling tube is constructed in such a manner that when the cooling fluid flows from a first end to a second end of the circulation tube, a position at which the refrigerant flowing in the cooling tube primarily intersects the circulation tube is located at the second end of the circulation tube, and another position at which the refrigerant completing heat exchange with the cooling fluid in the cooling tube secondarily intersects the circulation tube is located at the first end of the circulation tube. 
     
     
         4 . The multipath cross flow heat exchanger of  claim 1 , wherein the cooling tube is constructed to have a diameter larger than a diameter of the circulation tube, and the circulation tube is located in the cooling tube at positions at which the circulation tube and the cooling tube intersect each other, so that heat exchange between the cooling fluid and the refrigerant occurs at an outer surface of the circulation tube at portions at which the circulation tube intersects the cooling tube. 
     
     
         5 . The multipath cross flow heat exchanger of  claim 1 , wherein the cooling tube comprises:
 a body part having a housing-shaped structure and defining a space part therein, the space part including a predetermined part of the circulation tube;   a supply part provided on a position of an outer surface of the body part and supplying the refrigerant to the space part; and   a discharge part provided on another position of an outer surface of the body part and through which the refrigerant supplied to the space part is discharged.   
     
     
         6 . The multipath cross flow heat exchanger of  claim 5 , wherein the circulation tube is divided into multiple branch tubes in an area at which the circulation tube intersects the cooling tube, wherein each of the multiple branch tubes has a diameter smaller than the diameter of the circulation tube. 
     
     
         7 . The multipath cross flow heat exchanger of  claim 5 , wherein the supply part and the discharge part are located at one side based on the circulation tube passing through the body part, and are spaced apart from each other on an outer surface of the cooling tube. 
     
     
         8 . The multipath cross flow heat exchanger of  claim 6 , wherein the body part further comprises: a partition wall arranged in the space part defined in the body part at a location between the supply part and the discharge part, wherein the partition wall is provided with an opening part through which the refrigerant passes such that the refrigerant supplied to the space part through the supply part can be discharged through the discharge part.