Heat exchanger

Abstract

Disclosed is a heat exchanger that includes a tubular outer wall and partition walls that partition an inner side of the outer wall into heat medium passage cells and gas passage cells extending in an axial direction of the outer wall. The heat exchanger exchanges heat between a liquid heat medium flowing through the heat medium passage cells and a gas flowing through the gas passage cells. The ratio of the number of the heat medium passage cells to the number of the gas passage cells is 1:3 to 1:6.

1 . A heat exchanger, comprising:
 a tubular outer wall; and   partition walls that partition an inner side of the outer wall into heat medium passage cells and gas passage cells extending in an axial direction of the outer wall, wherein   the heat exchanger exchanges heat between a liquid heat medium flowing through the heat medium passage cells and a gas flowing through the gas passage cells, and   the ratio of the number of the heat medium passage cells to the number of the gas passage cells is 1:3 to 1:6.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the outer wall has the form of a rectangular tube that includes two opposing first side walls and two opposing second side walls,   the heat medium passage cells and the gas passage cells are arranged in heat medium passage cell lines and gas passage cell lines that are parallel to the first side walls in a cross section orthogonal to the axial direction of the outer wall, and   three to six of the gas passage cell lines are arranged between two adjacent ones of the heat medium passage cell lines in a direction extending along the second side walls.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein the outer wall has one side including an inlet and an outlet for a heat medium that are connected with the heat medium passage cells. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein the heat medium passage cells each have the same cross-sectional shape and the gas passage cells each have the same cross-sectional shape in a cross section orthogonal to the axial direction of the outer wall. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein each of the heat medium passage cells has a cross-sectional shape that is larger in size than that of each of the gas passage cells in a cross section orthogonal to the axial direction of the outer wall. 
     
     
         6 . The heat exchanger according to  claim 1 , wherein the partition walls include silicon carbide as a main component.