Heat Exchanger

Abstract

Provided is a heat exchanger having improved heat transfer performance. A heat exchanger according to the present invention includes a heat transfer unit configured to perform heat exchange by contact with gas, and a contact surface of the heat transfer unit to be in contact with the gas is provided with a fine structure body which has a height of 10 μm or less and a surface area of 10 times or more of a smooth surface. The gas desirably has a Reynolds number of 30,000 or more, and the fine structure body is desirably formed of the same material as that of a base material forming the contact surface. Moreover, the fine structure body desirably has heat conductivity equal to or larger than the base material forming the contact surface.

1 . A heat exchanger comprising a heat transfer unit configured to perform heat exchange by contact with gas, wherein a contact surface of the heat transfer unit to be in contact with the gas is provided with a fin structure body which has a height of 10 μm or less and a surface area of 10 times or more of a smooth surface. 
     
     
         2 . The heat exchanger according to  claim 1 , wherein the gas has a Reynolds number of 30,000 or more. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein the fine structure body is formed of the same material as that of the base material. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein the fine structure body has heat conductivity equal to or larger than the base material. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein the fine structure body has a shape of a dendritic structure or a needle-like structure. 
     
     
         6 . The heat exchanger according to  claim 1 , wherein the heat transfer unit has a length of 25 times or more of a characteristic length of a flow. 
     
     
         7 . The heat exchanger according to  claim 1 , wherein the base material is copper or copper alloy.