Patent ID: 8522862
Filing Date: 2013-09-03
Classification: F28D,F28F

Abstract:
1. A coolant cooler for motor vehicles having a soldered cooling network, the cooler comprising: flat pipes and ribs formed from thin sheets of aluminum and having collector boxes arranged at ends of the flat pipes for receiving coolant which flows in the flat pipes and which is cooled by air flowing across the ribs, wherein each flat pipe is composed of at least two shaped sheet metal strips, wherein at least one of the sheet metal strips forms a wall of the flat pipe and the other sheet metal strip constitutes a corrugated internal insert, forming ducts, therein, and in that the ratio of the constriction factor on the coolant side to the constriction factor on the cooling air side is between 0.20 and 0.44, wherein the hydraulic diameter on the coolant side is between 0.8 and 1.5 mm.