Heat exchanger and cooling system

Abstract

The invention relates to a heat exchanger ( 2 ), especially for use in a cooling circuit ( 1 ) of a vehicle, comprising at least one heat transfer network ( 3 ), whereby the heat transfer network ( 3 ) comprises at least one tubular device, and a cooling circuit ( 1 ) associated therewith. According to the invention, the tubular device has a characteristic hydraulic diameter which is smaller than or equal to 2.0 mm.

1 . A heat exchanger ( 2 ), in particular for use in a cooling circuit ( 1 ) of a motor vehicle, with at least one heat transmission network ( 3 ), the heat transmission network comprising at least one tube device ( 11 ), and the tube device having a characteristic hydraulic diameter which is smaller than or equal to 2.0 mm.  
   
   
       2 . The heat exchanger as claimed in  claim 1 , characterized in that at least a multiplicity of essentially identical tube devices ( 11 ) is provided.  
   
   
       3 . The heat exchanger as claimed in  claim 1 , characterized in that at least the cross section ( 23 ) of at least one tube device is taken from a group of cross-sectional shapes which comprises round and circular, elliptic, oval, angular, triangular, rectangular, square and rounded modifications of the cross-sectional shapes mentioned.  
   
   
       4 . The heat exchanger as claimed in  claim 1 , characterized in that the cooling medium flows essentially perpendicularly to the flow direction of the coolant.  
   
   
       5 . The heat exchanger as claimed in  claim 1 , characterized in that a characteristic cross-sectional ratio of the depth of a tube device ( 12 ) to the width of a tube device ( 13 ) is between 1 and 100, preferably between 7 and 50.  
   
   
       6 . The heat exchanger as claimed in  claim 1 , characterized in that the coolant contains water as an essential constituent.  
   
   
       7 . The heat exchanger as claimed in  claim 1 , characterized in that the cooling medium is a gas and preferably air.  
   
   
       8 . The heat exchanger as claimed in  claim 1 , characterized in that at least one tube device ( 11 ) has a characteristic hydraulic diameter which is smaller than or equal to 1.8 mm or smaller than or equal to 1.7 mm or smaller than or equal to 1.6 mm or smaller.  
   
   
       9 . A cooling system ( 1 ) with at least one pump device ( 6 ); with at least one heat exchanger device ( 2 ) which comprises at least one heat transmission network device ( 3 ); and with at least one heat source device ( 5 ), the pump device ( 6 ), the heat exchanger device ( 2 ) and the heat source device ( 5 ) being arranged in an essentially closed cooling circuit ( 1 ) through which a coolant flows; a pressure loss in the heat transmission network device ( 3 ) of the heat exchanger device being a proportion of at least 12% of the pressure loss in the coolant circuit.  
   
   
       10 . The cooling system as claimed in  claim 9 , characterized in that the pressure loss of the heat transmission network device ( 3 ) is higher than 20% of the pressure loss in the cooling circuit ( 1 ).  
   
   
       11 . The cooling system as claimed in  claim 9 , characterized in that the heat transmission network device ( 3 ) comprises tube devices ( 11 ), at least one tube device ( 11 ) being taken from a group of tube devices which comprises tubes with hydraulic diameters <2 mm, dimple tubes, tube devices with turbulence insert devices and the like.  
   
   
       12 . The cooling system as claimed in  claim 9 , characterized in that the coolant stream is deflected at least once.  
   
   
       13 . The cooling system as claimed in  claim 9 , characterized in that an electrically operated pump device is provided for conveying the coolant.