HEAT EXCHANGER

PURPOSE:To make the thickness of a partition wall smaller as well as increase the number of parallel refrigerant paths by forming the partition wall in the porous refrigerant tube into a latticed shape. CONSTITUTION:In a porous refrigerant tube 2 of a flat cross section, made of aluminum by extrusion molding, latticed internal partition walls 4a and 4b are provided to form many refrigerant paths 5. Since the thickness t1 and t2 of the internal partition walls 4a and 4b are sufficient small to prevent the lowering of the strength, the raduction of the cross section of the refrigerant paths 5 can be avoided. When the thickness t1 of the partition wall 4a is uniform, the buckling resistance of the partition wall 4a is more greatly raised, th shorter the length of the wall 4a becomes.