Multi-channel heat exchanger

Abstract

A flat tube, a multi-channel heat exchanger, and an air conditioning and refrigeration system. The flat tube has n groups of flow channels extending in a length direction of the flat tube, and the n groups of flow channels are distributed to be spaced apart in a width direction of the flat tube; and a flow cross-sectional area of a first group of the flow channels is A1, . . . , a flow cross-sectional area of kth group of the flow channels is Ak, . . . , a flow cross-sectional area of an nth group of the flow channels is An, 1<k≤n, Ak≥1.2Ak-1, and k is an integer greater than 1.

1 . A multi-channel heat exchanger, comprising:
 a first header, a second header, and a plurality of flat tubes,   wherein for each of the plurality of flat tubes, the flat tube has a first longitudinal side face and a second longitudinal side face opposite to and parallel to each other in a thickness direction of the flat tube, and a third longitudinal side face and a fourth longitudinal side face opposite to and parallel to each other in a width direction of the flat tube; a distance between the first longitudinal side face and the second longitudinal side face is less than a distance between the third longitudinal side face and the fourth longitudinal side face; the flat tube has n groups of flow channels extending in a length direction of the flat tube, and the n groups of flow channels are distributed to be spaced apart in the width direction of the flat tube; and a flow cross-sectional area of a first group of the flow channels is A 1 , a flow cross-sectional area of k th  group of the flow channels is A k , a flow cross-sectional area of an n th  group of the flow channels is An, 1<k≤n, A k ≥1.2A k-1  and k is an integer greater than 1;   wherein the plurality of flat tubes are arranged in parallel in a thickness direction of the flat tubes, a first end of each flat tube is connected to the first header, and a second end of each flat tube is connected to the second header, so as to connect the first header and the second header; and   the first group of flow channels, the k th  group of flow channels, the n th  group of flow channels of the flat tube are sequentially arranged in an air direction from an air inlet side to an air outlet side, the first group of flow channels being arranged close to the air inlet side; and   wherein a plurality of fins are arranged in parallel and spaced apart in a length direction of the flat tube, one side of each fin has a plurality of notches, and a part of each flat tube is inserted into a corresponding notch; and   each fin has first to m th  sections in the width direction of the plurality of flat tubes, and the first to m th  sections are sequentially arranged in the air direction, and m≤n,   each section of the fin has a plurality of slats arranged in the width direction of the flat tube; wherein the first section of the fin has a plurality of first slats arranged in the width direction of the flat tube, the h th  section of the fin has a plurality of h th  slats arranged in the width direction of the flat tube, the m th  section of the fin has a plurality of m th  slats arranged in the width direction of the flat tube; 1<h≤m, a flow cross-sectional area of a group of flow channels corresponding to the h th  section is greater than a flow cross-sectional area of another group of flow channels corresponding to the (h−1) th  section; and   an air-side heat transfer coefficient of the h th  section of the fin is greater than an air-side heat transfer coefficient of the (h−1) th  section of the fin.   
     
     
         2 . The multi-channel heat exchanger according to  claim 1 , wherein each group comprises a plurality of the flow channels, and flow cross-sectional areas of at least two flow channels in a same group are equal. 
     
     
         3 . The multi-channel heat exchanger according to  claim 1 , wherein shapes of at least two flow channels in a same group are the same. 
     
     
         4 . The multi-channel heat exchanger according to  claim 1 , wherein a louver angle of each first slat is R 1 , a louver angle of each h th  slat is Rh, a louver angle of each m th  slat is Rm, and Rh>R(h−1). 
     
     
         5 . The multi-channel heat exchanger according to  claim 1 , wherein a louver length of each first slat is L 1 , a louver length of each h th  slat is Lh, a louver length of each m th  slat is Lm, and Lh>L(h−1). 
     
     
         6 . The multi-channel heat exchanger according to  claim 1 , wherein a distance between each two adjacent first slats is D 1 , a distance between each two adjacent h th  slats is Dh, a distance between each two adjacent m th  slats is Dm, and Dh<D(h−1). 
     
     
         7 . The multi-channel heat exchanger according to  claim 1 , wherein heights of all of the flow channels in the thickness direction of the flat tube are the same. 
     
     
         8 . The multi-channel heat exchanger according to  claim 1 , wherein each fin has two sections. 
     
     
         9 . An air conditioning and refrigeration system, comprising a multi-channel heat exchanger, comprising:
 a first header, a second header, and a plurality of flat tubes,   wherein for each of the plurality of flat tubes, the flat tube has a first longitudinal side face and a second longitudinal side face opposite to and parallel to each other in a thickness direction of the flat tube, and a third longitudinal side face and a fourth longitudinal side face opposite to and parallel to each other in a width direction of the flat tube; a distance between the first longitudinal side face and the second longitudinal side face is less than a distance between the third longitudinal side face and the fourth longitudinal side face; the flat tube has n groups of flow channels extending in a length direction of the flat tube, and the n groups of flow channels are distributed to be spaced apart in the width direction of the flat tube; and a flow cross-sectional area of a first group of the flow channels is A 1 , a flow cross-sectional area of k th  group of the flow channels is A k , a flow cross-sectional area of an n th  group of the flow channels is An, 1<k≤n, A k ≥1.2A k-1  and k is an integer greater than 1;   wherein the plurality of flat tubes are arranged in parallel in a thickness direction of the flat tubes, a first end of each flat tube is connected to the first header, and a second end of each flat tube is connected to the second header, so as to connect the first header and the second header; and   the first group of flow channels, the k th  group of flow channels, the n th  group of flow channels of the flat tube are sequentially arranged in an air direction from an air inlet side to an air outlet side, the first group of flow channels being arranged close to the air inlet side; and   wherein a plurality of fins are arranged in parallel and spaced apart in a length direction of the flat tube, one side of each fin has a plurality of notches, and a part of each flat tube is inserted into a corresponding notch; and   each fin has first to m th  sections in the width direction of the plurality of flat tubes, and the first to m th  sections are sequentially arranged in the air direction, and m≤n, each section of the fin has a plurality of slats arranged in the width direction of the flat tube; wherein the first section of the fin has a plurality of first slats arranged in the width direction of the flat tube, the h th  section of the fin has a plurality of h th  slats arranged in the width direction of the flat tube, the m th  section of the fin has a plurality of m th  slats arranged in the width direction of the flat tube; 1<h≤m, a flow cross-sectional area of a group of flow channels corresponding to the h th  section is greater than a flow cross-sectional area of another group of flow channels corresponding to the (h−1) th  section; and   an air-side heat transfer coefficient of the h th  section of the fin is greater than an air-side heat transfer coefficient of the (h−1) th  section of the fin.   
     
     
         10 . The air conditioning and refrigeration system according to  claim 9 , wherein each fin has two sections. 
     
     
         11 . The air conditioning and refrigeration system according to  claim 9 , wherein a louver angle of each first slat is R 1 , a louver angle of each h th  slat is Rh, a louver angle of each m th  slat is Rm, and Rh>R(h−1). 
     
     
         12 . The air conditioning and refrigeration system according to  claim 9 , wherein a louver length of each first slat is L 1 , a louver length of each h th  slat is Lh, a louver length of each m th  slat is Lm, and Lh>L(h−1). 
     
     
         13 . The air conditioning and refrigeration system according to  claim 9 , wherein a distance between each two adjacent first slats is D 1 , a distance between each two adjacent h th  slats is Dh, a distance between each two adjacent m th  slats is Dm, and Dh<D(h−1). 
     
     
         14 . The air conditioning and refrigeration system according to  claim 9 , wherein each group comprises a plurality of the flow channels, and flow cross-sectional areas of at least two flow channels in a same group are equal. 
     
     
         15 . The air conditioning and refrigeration system according to  claim 9 , wherein shapes of at least two flow channels in a same group are the same.