Heat exchanger device

Abstract

The heat transfer performance of a heat exchanger situated on the downstream side of airflow is improved by utilizing a turbulent flow in a heat exchanger situated on the upstream side of airflow. At least on fins 12 of a heat exchanger 10 on the upstream side of airflow among a plurality of heat exchanger devices 10, 20 arranged in series in the airflow direction, collision walls 12 c cut and raised in an upright position as a turbulent flow forming means for stirring airflow are provided.

1 . A heat exchanger device in which a plurality of heat exchangers are arranged in series in an airflow direction, wherein: 
 the plurality of heat exchangers comprise tubes through which fluids flow, respectively, and fins provided on an outer surface of the tubes for increasing heat exchanging area with air flowing around the tubes; and    the fins of the heat exchanger on an upstream side of airflow among the plurality of heat exchangers are provided with turbulent flow forming means for stirring the airflow.    
   
   
       2 . The heat exchanger device as set forth in  claim 1 , wherein the fins of the heat exchanger on a downstream side of the airflow among the plurality of heat exchangers are also provided with turbulent flow forming means for stirring the airflow.  
   
   
       3 . The heat exchanger device as set forth in  claim 1 , wherein a distance between the plurality of heat exchangers is equal to or less than 20 mm.  
   
   
       4 . The heat exchanger device as set forth in  claim 1 , wherein: 
 the fins have right-angled collision walls formed by cutting and raising in an upright position a portion of flat-shaped plate parts;    the right-angled collision walls are provided in a plural number symmetrically in the airflow direction; and    the right-angled collision walls constitute the turbulent flow forming means.    
   
   
       5 . The heat exchanger device as set forth in  claim 1 , wherein: 
 the fins have V-shaped collision walls formed by cutting and raising into a V-shaped section a portion of the flat-shaped plate parts;    the V-shaped collision walls are provided such that a direction of formation of the V-shaped section is reversed by turns in the airflow direction; and    the V-shaped collision walls constitute the turbulent flow forming means.    
   
   
       6 . The heat exchanger device as set forth in  claim 1 , wherein the heat exchanger on the upstream side of the airflow among the plurality of the heat exchangers is a refrigerant heat dissipater for vehicle air conditioning and the heat exchanger on a downstream side of the airflow is a radiator for cooling vehicle engine.