Multi-channel heat exchanger and air conditioning refrigeration system

Abstract

A multi-channel heat exchanger includes a plurality of heat exchange tubes, each heat exchange tube includes first to fourth heat exchange tube portions which are distributed along a direction from an airflow inlet side to an airflow outlet side. Each heat exchange tube portion includes at least two flow channels. The heat exchange tube has a cross section defined in a thickness direction and a width direction of the heat exchange tubes, and the cross section includes a flow section. A total area of a flow section of the first heat exchange tube portion is A1, a total area of a flow section of the fourth heat exchange tube portion is A4, and the total area A1 of the flow section of the first heat exchange tube portion is 1.05-1.4 times of the total area A4 of the flow section of the fourth heat exchange tube portion.

1 . A multi-channel heat exchanger, comprising:
 a plurality of heat exchange tubes spaced apart along a thickness direction of the heat exchange tube,   the heat exchange tube having a first longitudinal side face and a second longitudinal side face opposite to and parallel to each other along the thickness direction of the heat exchange tube, and a third longitudinal side face and a fourth longitudinal side face opposite to each other along a width direction of the heat exchange tube, a distance between the first longitudinal side face and the second longitudinal side face being less than a distance between the third longitudinal side face and the fourth longitudinal side face,   the heat exchange tube being divided into four portions with an equal width along the width direction of the heat exchange tube, the four portions comprising a first heat exchange tube portion, a second heat exchange tube portion, a third heat exchange tube portion and a fourth heat exchange tube portion distributed along a direction from an inlet side of an airflow to an outlet side of the airflow, each heat exchange tube portion comprising at least two flow channels, the flow channel extending in a length direction of the heat exchange tube, the respective flow channels of the four portions being spaced apart along the width direction of the heat exchange tube,   the heat exchange tube having a cross section defined in the thickness direction of the heat exchange tube and the width direction of the heat exchange tube, the cross section comprising a flow section, a total area of a flow section of the first heat exchange tube portion being A1, a total area of a flow section of the second heat exchange tube portion being A2, a total area of a flow section of the third heat exchange tube portion being A3, a total area of a flow section of the fourth heat exchange tube portion being A4, and the total area A1 of the flow section of the first heat exchange tube portion being 1.05-1.4 times of the total area A4 of the flow section of the fourth heat exchange tube portion.   
     
     
         2 . The multi-channel heat exchanger according to  claim 1 , wherein distances from at least one of the flow channels in the four heat exchange tube portions to two flow channels adjacent to the at least one of the flow channels are different. 
     
     
         3 . The multi-channel heat exchanger according to  claim 1 , wherein a distance between any two adjacent flow channels in the first heat exchange tube portion is greater than or equal to a distance between any two adjacent flow channels in the second heat exchange tube portion. 
     
     
         4 . The multi-channel heat exchanger according to  claim 1 , wherein a sum of flow sectional areas of the flow channels completely located in the first heat exchange tube portion in the respective flow channels of the first heat exchange tube portion is greater than or equal to a sum of flow sectional areas of the flow channels completely located in the second heat exchange tube portion in the respective flow channels of the second heat exchange tube portion. 
     
     
         5 . The multi-channel heat exchanger according to  claim 1 , further comprising a fin, the fin being arranged between two heat exchange tubes along the thickness direction of the heat exchange tube and connected to the two heat exchange tubes, respectively, the fin comprising first to nth groups of fins, the first to groups of fins being distributed along the direction from the inlet side of the airflow to the outlet side of the airflow, wherein 1≤n, n is an integer, and an air-side heat transfer coefficient of the nth group of fins is less than an air-side heat transfer coefficient of the first group of fins. 
     
     
         6 . The multi-channel heat exchanger according to  claim 5 , wherein the first to nth groups of fins comprise a plurality of louvers arranged along the width direction of the heat exchange tube, and the number of the louvers of the first group of fins is greater than the number of the louvers of the nth group of fins. 
     
     
         7 . The multi-channel heat exchanger according to  claim 6 , wherein the multi-channel heat exchanger comprises at least one of following features:
 a. an opening width of the louver of the first group of fins is greater than an opening width of the louver of the nth group of fins;   b. an opening angle of the louver of the first group of fins is greater than an opening angle of the louver of the nth group of fins; and   c. an opening length of the louver of the first group of fins is greater than an opening length of the louver of the nth group of fins.   
     
     
         8 . The multi-channel heat exchanger according to  claim 6 , wherein a spacing between two adjacent fins in the first group of fins along the length direction of the heat exchange tube is less than a spacing between two adjacent fins in the nth group of fins along the length direction of the heat exchange tube. 
     
     
         9 . The multi-channel heat exchanger according to  claim 1 , wherein a flow sectional area of each flow channel in each the same heat exchange tube portion is the same. 
     
     
         10 . The multi-channel heat exchanger according to  claim 9 , wherein the multi-channel heat exchanger comprises at least one of following features:
 a. a shape of a cross sectional of each flow channel in the same heat exchange tube portion is the same;   b. each heat exchange tube portion comprises a same number of flow channels;   c. sizes of any two flow channels along the width direction of the heat exchange tube are the same, and sizes of the flow channels in different heat exchange tube portions along the thickness direction of the heat exchange tube are different;   d. sizes of any two flow channels along the thickness direction of the heat exchange tube are the same, and sizes of the flow channels in different heat exchange tube portions along the width direction of the heat exchange tube are different; and   e. at least part of the flow channels are provided with an inner rib.   
     
     
         11 . An air conditioning refrigeration system, comprising a multi-channel heat exchanger, a second heat exchanger, a compressor and a throttle valve, one of a first header of the multi-channel heat exchanger and a first end of the second heat exchanger being connected to an inlet end of the compressor, the other one of the first header of the multi-channel heat exchanger and the first end of the second heat exchanger being connected to an outlet end of the compressor, and the throttle valve being connected between a second header of the multi-channel heat exchanger and a second end of the second heat exchanger,
 the multi-channel heat exchanger, comprising a plurality of heat exchange tubes spaced apart along a thickness direction of the heat exchange tube,   the heat exchange tube having a first longitudinal side face and a second longitudinal side face opposite to and parallel to each other along the thickness direction of the heat exchange tube, and a third longitudinal side face and a fourth longitudinal side face opposite to each other along a width direction of the heat exchange tube, a distance between the first longitudinal side face and the second longitudinal side face being less than a distance between the third longitudinal side face and the fourth longitudinal side face,   the heat exchange tube being divided into four portions with an equal width along the width direction of the heat exchange tube, the four portions comprising a first heat exchange tube portion, a second heat exchange tube portion, a third heat exchange tube portion and a fourth heat exchange tube portion distributed along a direction from an inlet side of an airflow to an outlet side of the airflow, each heat exchange tube portion comprising at least two flow channels, the flow channel extending in a length direction of the heat exchange tube, the respective flow channels of the four portions being spaced apart along the width direction of the heat exchange tube,   the heat exchange tube having a cross section defined in the thickness direction of the heat exchange tube and the width direction of the heat exchange tube, the cross section comprising a flow section, a total area of a flow section of the first heat exchange tube portion being A1, a total area of a flow section of the second heat exchange tube portion being A2, a total area of a flow section of the third heat exchange tube portion being A3, a total area of a flow section of the fourth heat exchange tube portion being A4, and the total area A1 of the flow section of the first heat exchange tube portion being 1.05-1.4 times of the total area A4 of the flow section of the fourth heat exchange tube portion.   
     
     
         12 . The air conditioning refrigeration system according to  claim 11 , wherein distances from at least one of the flow channels in the four heat exchange tube portions to two flow channels adjacent to the at least one of the flow channels are different. 
     
     
         13 . The air conditioning refrigeration system according to  claim 11 , wherein a distance between any two adjacent flow channels in the first heat exchange tube portion is greater than or equal to a distance between any two adjacent flow channels in the second heat exchange tube portion. 
     
     
         14 . The air conditioning refrigeration system according to  claim 11 , wherein a sum of flow sectional areas of the flow channels completely located in the first heat exchange tube portion in the respective flow channels of the first heat exchange tube portion is greater than or equal to a sum of flow sectional areas of the flow channels completely located in the second heat exchange tube portion in the respective flow channels of the second heat exchange tube portion. 
     
     
         15 . The air conditioning refrigeration system according to  claim 11 , wherein the multi-channel heat exchanger further comprises a fin, the fin is arranged between two heat exchange tubes along the thickness direction of the heat exchange tube and connected to the two heat exchange tubes, respectively, the fin comprises first to nth groups of fins, the first to nth groups of fins are distributed along the direction from the inlet side of the airflow to the outlet side of the airflow, wherein 1≤n, n is an integer, and an air-side heat transfer coefficient of the nth group of fins is less than an air-side heat transfer coefficient of the first group of fins. 
     
     
         16 . The air conditioning refrigeration system according to  claim 15 , wherein the first to nth groups of fins comprise a plurality of louvers arranged along the width direction of the heat exchange tube, and the number of the louvers of the first group of fins is greater than the number of the louvers of the nth group of fins. 
     
     
         17 . The air conditioning refrigeration system according to  claim 16 , wherein the multi-channel heat exchanger comprises at least one of following features:
 a. an opening width of the louver of the first group of fins is greater than an opening width of the louver of the nth group of fins;   b. an opening angle of the louver of the first group of fins is greater than an opening angle of the louver of the nth group of fins; and   c. an opening length of the louver of the first group of fins is greater than an opening length of the louver of the nth group of fins.   
     
     
         18 . The air conditioning refrigeration system according to  claim 16 , wherein a spacing between two adjacent fins in the first group of fins along the length direction of the heat exchange tube is less than a spacing between two adjacent fins in the nth group of fins along the length direction of the heat exchange tube. 
     
     
         19 . The air conditioning refrigeration system according to  claim 11 , wherein a flow sectional area of each flow channel in the same heat exchange tube portion is the same. 
     
     
         20 . The air conditioning refrigeration system according to  claim 19 , wherein the multi-channel heat exchanger comprises at least one of following features:
 a. a shape of a cross section of each flow channel in the same heat exchange tube portion is the same;   b. each heat exchange tube portion comprises a same number of flow channels;   c. sizes of any two flow channels along the width direction of the heat exchange tube are the same, and sizes of the flow channels in different heat exchange tube portions along the thickness direction of the heat exchange tube are different;   d. sizes of any two flow channels along the thickness direction of the heat exchange tube are the same, and sizes of the flow channels in different heat exchange tube portions along the width direction of the heat exchange tube are different; and   e. at least part of the flow channels are provided with an inner rib.