Heat exchanger

1. A heat exchanger, comprising:

a pair of header tanks spaced apart from each other by a predetermined distance and disposed in parallel with each other;

a plurality of tubes having both ends fixed to the pair of header tanks to form channels for a refrigerant; and

fins interposed between the tubes,

wherein a tube of the plurality of tubes is an extrusion tube;

wherein a width W of the extension tube is larger than a height H of the extension tubed;

wherein when the channel in the extension tube is partitioned into a plurality of holes disposed in parallel with each other in a width direction of the extension tube by a plurality of internal walls extending in a height direction of the extension tube;

wherein the heat exchanger has dimensions within a range in which a position X in the width direction from an end portion of the extension tube and a cross-sectional area A of the extension tube in a length direction at the position X in the width direction satisfy the following Expressions:

A≤HL wherein 0< X≤w 0  Expression 1

A≥HL+ 2 rL (√(1−( X/r− 1) 2 −1)· X , wherein 0< X≤r and 0.15 H<r< 0.45 H   Expression 2

in which;

X is a position in the width direction;

A is a cross-sectional area in the length direction;

H is a height of the extension tube;

r is a radius of a rounded corner of the tube;

L is a length of the tube;

w 0 is a thickness of an outer wall in the width direction of the end portion of the extension tube in the width direction; and

wc is a value of X at a tube-fin contact point; and

wherein the end portion of the extension tube has a cross section in a quadrangular shape with rounded corners, each having a radius in a range of 15% to 45% of the height H of the extension tube.

2. The heat exchanger of claim 1 , wherein the heat exchanger has dimensions within a range in which Expressions 1 and 2 are satisfied so that a cross section of the end portion of the extension tube has a quadrangular shape, wherein corners thereof are rounded or a larger shape than the quadrangular shape of which the corners are rounded.

3. The heat exchanger of claim 1 , wherein the heat exchanger has dimensions within a range satisfying the following Expression:

wc≤w 0  Expression 3,

in which wherein w 0 is a thickness of the outer wall in the width direction of the end portion of the extension tube in the width direction, and we is a value of X at the tube-fin contact point.

4. The heat exchanger of claim 3 , wherein the heat exchanger has dimensions within a range in which Expression 3 is satisfied so that a position where the extension tube contacts the fin is located in front of a position of a first hole of the extension tube.

5. The heat exchanger of claim 3 , wherein when an expression expressing a range of positions of first holes to n0-th holes from the opposite end portions with the position X in the width direction is an end portion range expression, the end portion range expression is as follows:

First hole: w 0 ≤X≤w 0 +h 0

n 0- th hole: ( w 0 +h 0)+(( n 0−1) w +( n 0−2) h )≤ X ≤( w 0 +h 0)+( n 0−1)( w+h )

N−n 0+1- th hole: ( w 0 +h 0)+(( N−n 0) w +( N−n 0−1) h )≤ X ≤( w 0 +h 0)+( N−n 0)( w+h )

N - th hole: ( w 0 +h 0)+(( N− 1) w +( N− 2) h )≤ X ≤( w 0+2 h 0)+(( N− 1) w +( N− 2) h )

wherein n is a hole index;

N is a total number of holes; h 0 is a width of a hole of the end portion of the extension tube in the width direction; and

h is a width of a hole at the remaining positions.

6. The heat exchanger of claim 5 , wherein when an expression expressing a range of positions of holes corresponding to the remaining region other than a region corresponding to the range of the end portion range expression with the position X in the width direction is an intermediate portion range expression, the intermediate portion range expression is as follows:

n - th hole: ( w 0 +h 0)+(( n −1) w +( n −2) h )≤ X ≤( w 0 +h 0)+( n −1)( w+h ), n 0 <n<N−n 0+1

wherein n is a hole index;

N is a total number of holes;

h 0 is a width of a hole of the end portion of the extension tube in the width direction;

and h is a width of a hole at the remaining positions.

7. The heat exchanger of claim 6 , wherein the heat exchanger has dimensions within a range in which the position X in the width direction and a thickness t of an outer wall in the height direction at a position of a hole satisfy the following Expression:

t=t 0 (when X is within the range of the end portion range expression)

wherein t 0 is a thickness of an outer wall in the height direction at a position of a hole of the end portion side of the extension tube in the width direction.

8. The heat exchanger of claim 7 , wherein the heat exchanger has dimensions within a range in which the Expression is satisfied so that a thickness t of an outer wall in the height direction at a position of a hole in the range of the end portion range expression is t 0 .

9. The heat exchanger of claim 7 , wherein the heat exchanger has dimensions within a range in which the position X in the width direction and a thickness t of an outer wall in the height direction at a position of a hole satisfy the following Expression:

t=tm (when X is within the range of the intermediate portion range expression)

Expression 4: t 0 >tm

in which t 0 is a thickness of an outer wall in the height direction at a position of a hole of the end portion side of the extension tube in the width direction, and tm is a thickness of an outer wall in the height direction at a position of a hole of the intermediate portion side of the extension tube in the width direction.

10. The heat exchanger of claim 9 , wherein the heat exchanger has dimensions within a range in which the above Expression is satisfied so that tm is a thickness t of an outer wall in the height direction at a position of a hole in the range of the intermediate portion range expression, and

wherein a thickness t of an outer wall in the height direction at a position of a hole in the range of the end portion range expression is larger than a thickness t of an outer wall in the height direction at a position of a hole in the range of the intermediate portion range expression.

11. The heat exchanger of claim 5 , wherein the heat exchanger has dimensions within a range satisfying the following Expression:

2≤ n 0≤

.

12. The heat exchanger of claim 11 , wherein the heat exchanger has dimensions within a range in which the above Expression is satisfied so that the range of the end portion range expression is a range of positions of first holes to second holes or third holes from the opposite end portions.

13. The heat exchanger of claim 11 , wherein 10% to 20% of a total weight of the extension tube is biasedly distributed to a region corresponding to the following range of the position X in the width direction

First hole: w 0 ≤X≤w 0 +h 0

n 0- th hole: ( w 0 +h 0)+(( n 0−1) w +( n 0−2) h )≤ X ≤( w 0 +h 0)+( n 0−1)( w+h )

N−n 0+1- th hole: ( w 0 +h 0)+(( N−n 0) w +( N−n 0−1) h )≤ X ≤( w 0 +h 0)+( N−n 0)( w+h )

N - th hole: ( w 0 +h 0)+(( N− 1) w +( N− 2) h )≤ X ≤( w 0+2 h 0)+(( N− 1) w +( N− 2) h )

2≤ n 0≤3  Expression 5:

in which n is a hole index, N is a total number of holes, h 0 is a width of a hole of the end portion of the extension tube in the width direction, and h is a width of a hole at the remaining positions.

14. The heat exchanger of claim 13 , wherein the heat exchanger has dimensions within a range in which the above Expression is satisfied so that the weight is biasedly distributed to a region corresponding to a range of positions of first holes to second holes or third holes from the opposite end portions.

15. The heat exchanger of claim 1 , wherein the extension tube is formed of an aluminum material.