Heat exchanger

Abstract

A heat exchanger comprises: a first header; a second header; a plurality of tubes spaced apart from each other and each connected between the first and second headers in fluid communication therewith; and a plurality of fins each disposed between adjacent tubes, in which the heat exchanger has a bent portion between the first and second headers such that the heat exchanger is divided into first and second heat exchanger portions which are located at two sides of the bent portion respectively, and a heat transfer coefficient of the second heat exchanger portion is greater than that of the first heat exchanger portion. The heat exchanger according to embodiments of the present disclosure is bent into a substantially inverted V-shape, and the capacities of the heat exchanger on two sides of the bending position are identical, thus improving the heat exchange performance.

1 . A heat exchanger, comprising:
 a first header;   a second header;   a plurality of tubes spaced apart from each other and each connected between the first and second headers in fluid communication therewith; and   a plurality of fins each disposed between adjacent tubes;   wherein the heat exchanger has a bent portion between the first and second headers such that the heat exchanger is divided into first and second heat exchanger portions which are located at two sides of the bent portion respectively; and   wherein a heat transfer coefficient of the second heat exchanger portion is greater than that of the first heat exchanger portion.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein each fin is divided into a first fin portion in the first heat exchanger portion and a second fin portion in the second heat exchanger portion, and a heat transfer coefficient of the second fin portions is greater than that of the first fin portions. 
     
     
         3 . The heat exchanger according to  claim 2 , wherein each of the first and second fin portions is formed with louvers, in which a louver angle of the louvers in each second fin portion is greater than that of the louvers in each first fin portion. 
     
     
         4 . The heat exchanger according to  claim 2 , wherein each of the first and second fin portions is formed with louvers, in which a louver length of the louvers in each second fin portion is greater than that of the louvers in each first fin portion. 
     
     
         5 . The heat exchanger according to  claim 2 , wherein each of the first and second fin portions has a substantially corrugated shape, and a fin pitch of each second fin portion is smaller than that of each first fin portion. 
     
     
         6 . The heat exchanger according to  claim 1 , further comprising a third header and a fourth header,
 wherein the first header and the third header are connected together and communicate with each other via the first tube portions, and the second header and the fourth header are connected together and communicate with each other via the second tube portions;   wherein the third header and the fourth header are connected together and communicate with each other via a connection pipe; and   wherein the bent portion is formed by bending the connection pipe.   
     
     
         7 . The heat exchanger according to  claim 1 , wherein the heat exchanger is formed by bending a single heat exchanger of parallel flow type. 
     
     
         8 . The heat exchanger according to  claim 7 , wherein no fins are disposed in the bent portion.