Information
-
Patent Grant
-
6561264
-
Patent Number
6,561,264
-
Date Filed
Thursday, March 15, 200123 years ago
-
Date Issued
Tuesday, May 13, 200321 years ago
-
Inventors
-
Original Assignees
-
Examiners
- Bennett; Henry
- McKinnon; Terrell
Agents
- Harness, Dickey & Pierce, PLC
-
CPC
-
US Classifications
Field of Search
US
- 165 140
- 165 176
- 165 135
-
International Classifications
-
Abstract
A condenser core portion carries out a heat exchange between refrigerant and air. The condenser core portion includes a plurality of condenser tubes through which the refrigerant flows and condenser fins disposed between each pair of adjacent condenser tubes. A radiator core portion is disposed in series with the condenser core portion in an external fluid flow direction with a predetermined clearance therebetween, to carry out a heat exchange between engine coolant and the air. The radiator core portion includes a plurality of radiator tubes through which the engine coolant flows and radiator fins disposed between each pair of adjacent radiator tubes. A connecting portion integrates each of condenser fins and radiator fins. The condenser fins disposed at an upper area of the condenser core portion introduce cooling performances more than the condenser fins disposed at a lower area thereof.
Description
CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application Nos. 2000-79350 filed on Mar. 16, 2000, and 2001-67002 filed on Mar. 9, 2001.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a compound heat exchanger including a plurality of heat exchangers suitable for use in an automotive cooling module in which a condenser is integrated with a radiator.
2. Description of Related Art
JP-A-10-253276 discloses a compound heat exchanger in which a condenser is integrated with a radiator. In the conventional compound heat exchanger, fin of a condenser core portion and fin of a radiator core portion are integrally formed, and a louver arrangement of the condenser fin is different from a louver arrangement of the radiator fin for adjusting heat exchanging performances of the radiator and the condenser.
Here, the louver arrangement includes etching angle, louver etching length, width dimension, the number of louvers, and the like.
However, in the conventional compound heat exchanger, heat exchanging performance does not vary within the condenser or within the radiator. Thus, when required heat exchanging performances are different between at one area and another area within the condenser or within the radiator, the conventional compound heat exchanger cannot satisfy such a request.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a compound heat exchanger easily attaining required heat exchanging performance between at one area and another area within a heat-exchanging core.
According to the present invention, a first core portion to carries out a heat exchange between a first fluid and an external fluid. The first core portion includes a plurality of first tubes through which the first fluid flows and first cooling fins disposed between each pair of adjacent first tubes. A second core portion is disposed in series with the first core portion in an external fluid flow direction with a predetermined clearance therebetween, to carry out a heat exchange between a second fluid and the external fluid. The second core portion includes a plurality of second tubes through which the second fluid flows and second cooling fins disposed between each pair of adjacent second tubes. A connecting portion integrates each of first cooling fins and second cooling fins. At least one of the first cooling fins and the second cooling fins introduce different cooling performances between at one area and another area within at least one of the first core portion and the second core portion. Thus, the compound heat exchanger easily attains the required heat exchanging performance being different between at one area and another area within at least one of the first core portion and the second core portion.
BRIEF DESCRIPTION OF THE DRAWINGS
Additional objects and advantages of the present invention will be more readily apparent from the following detailed description of preferred embodiments thereof when taken together with the accompanying drawings in which:
FIG. 1
is a perspective view showing a compound heat exchanger viewing from a radiator side (first embodiment);
FIG. 2
is a perspective view showing the compound heat exchanger viewing from a condenser side (first embodiment);
FIG. 3A
is a cross-sectional view showing an upper area of a heat exchanging core portion with respect to line III—III in
FIG. 1
(first embodiment);
FIG. 3B
is a cross-sectional view showing a lower area of the heat exchanging core portion with respect to line III—III in
FIG. 1
(first embodiment);
FIG. 4
is a perspective view showing an integrated fin (first embodiment);
FIG. 5A
is a schematic view showing a roller forming apparatus (first embodiment);
FIG. 5B
is an enlarged view of V-portion in
FIG. 5A
(first embodiment);
FIG. 6
is a graph showing heat exchanging performances of the condenser and the radiator in accordance with a ratio of integrated fins
300
a
to integrated fins
300
b
(first embodiment);
FIG. 7
is a perspective view showing a compound heat exchanger (second embodiment);
FIG. 8
is a cross-sectional view showing a heat exchanging core portion (second embodiment), and
FIG. 9
is a cross-sectional view showing a heat exchanging core portion (second embodiment).
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
First Embodiment
As shown in
FIGS. 1 and 2
, a heat exchanger
700
includes a condenser
100
and a radiator
200
. The condenser
100
cools a refrigerant (first fluid) circulating in a vehicle refrigerating cycle, and the radiator
200
cools an engine coolant (second fluid). In the heat exchanger
700
, the condenser
100
and the radiator
200
are integrated with each other.
FIG. 1
is a perspective view showing the heat exchanger
700
viewing from the radiator
200
side (downstream side of air flow), and
FIG. 2
is a perspective view showing the heat exchanger
700
viewing from the condenser
100
side (upstream side of air flow).
As shown in
FIG. 2
, the condenser
100
includes a condenser core portion (first core portion)
110
. In the condenser core portion
110
, condenser tubes
111
and corrugate fins
112
are provided. The condenser tube
111
is made of aluminum and formed in a flat. The condenser tube
111
has a refrigerant passage therein. The fin
112
is formed in a wave, and brazed to the condenser tube
111
.
As shown in
FIG. 1
, the radiator
200
includes a radiator core portion (second core portion)
210
. In the radiator core portion
210
, radiator tubes
211
and corrugate fins
212
are provided. The radiator tube
211
is made of aluminum and formed in a flat. The radiator tube
111
has an engine coolant passage therein. The fin
212
is formed in a wave, and brazed to the radiator tube
211
. The condenser tube
111
and the radiator tube
211
are arranged perpendicularly to the air flow, and arranged in parallel with each other.
In both core portions
110
,
210
, as shown in
FIG. 3
, a predetermined gap δ is provided between the condenser tube
111
and the radiator tube
211
for preventing the heat of the radiator core portion
210
from being transmitted to the condenser core portion
110
.
The fins
112
and
212
are integrally roller-formed, and as shown in
FIG. 4
, include a plurality of peaks
112
a
,
212
a
, a plurality of valleys
112
b
,
212
b
, and a plurality of flat portions
112
c
,
212
c
. The flat portions
112
c
,
212
c
are formed between the peaks
112
a
,
212
a
and valleys
112
c
,
212
c
adjacent thereto.
Hereinafter, the fins
112
,
212
integrally formed and extending over both core portions
110
,
210
is referred as an integrated fin
300
, and both core portions
110
,
210
integrated by the integrated fin
300
is referred as an heat exchanging portion
330
.
As shown in
FIG. 3
, the flat portions
112
c
,
212
c
, include louvers
112
d
,
212
d
, respectively, to disorder the air-flow passing through the fins
112
,
212
for preventing thermal boundary layer from increasing. The louvers
112
d
,
212
d
are formed by etching a part of flat portions
112
c
,
212
c
. Further, as shown in
FIG. 4
, connecting portions
310
are partially provided between the flat portions
112
c
and
212
c
for partially connecting the condenser fin
112
to the radiator fin
212
while keeping the condenser fin
112
apart from the radiator fin
212
by a predetermined gap W.
Here, the predetermined gap W is at least larger than plate thickness of both fins
112
,
212
. A slit
320
is provided by keeping the condenser fin
112
apart from the radiator fin
212
, and the slit
320
suppresses the heat transmission from the radiator core portion
210
to the condenser core portion
110
.
In the integrated fin
300
, arrangements and design of the louvers
112
d
and
212
d
are different between at an upper area and a lower area of one-dotted chain line III—III in FIG.
1
. For example, as shown in
FIG. 3A
, at the upper area of the line III—III, the arrangements and design of the louvers
112
d
are the same as of the louvers
212
d
. That is, etching angle, etching length, width dimension, and the number of louvers
112
d
are the same as of the louvers
212
d
. At the lower area of the line III—III, as shown in
FIG. 3B
, the number of louvers
112
d
is smaller than that of louvers
212
d
, and remaining arrangements and design thereof are the same as of the louvers
212
d.
As shown in
FIGS. 1 and 2
, a side plate
400
is provided at the bottom of both core portions
110
,
210
for supporting both core portions
110
,
210
. The side plate
400
includes a bracket
410
for attaching the heat exchanger
500
to a vehicle.
A first radiator tank
220
is disposed at one end of the radiator core portion
210
. The first radiator tank
220
distributes the engine coolant into each radiator tube
211
. A second radiator tank
230
is disposed at the other end of the radiator core portion
210
. The second radiator tank
230
receives the engine coolant having been heat-exchanged with the air.
The first radiator tank
220
includes an inlet port
221
at the upper area thereof. The engine coolant flowing out of the engine is introduced into the first radiator tank
220
through the inlet port
221
. The second radiator tank
230
includes an outlet port
231
at the lower area thereof. The engine coolant flows out of the second radiator tank
230
through the outlet port
231
, and flows to the engine.
A joint pipe
222
,
232
is brazed to each radiator tank
220
,
230
for connecting outside pipes (not illustrated) to each radiator tank
220
,
230
.
A first condenser tank
120
is disposed at one end of the condenser core portion
110
. The first condenser tank
120
distributes the refrigerant into each condenser tube
111
. A second condenser tank
130
is disposed at the other end of the condenser core portion
110
. The second condenser tank
130
receives the refrigerant having heat-exchanged with the air.
The first condenser tank includes an inlet port
121
at the upper area thereof. The refrigerant discharged from a compressor (not illustrated) is introduced into the first condenser tank
120
through the inlet port
121
. The second condenser tank
130
includes an outlet port
131
at the lower area thereof. The refrigerant having heat-exchanged with the air flows into an expansion valve (not illustrated) through the outlet port
131
.
A joint pipe
122
,
132
is brazed to each condenser tank
120
,
130
for connecting outside pipes (not illustrated) to each condenser tank
120
,
130
.
Next, a method for manufacturing the integrated fin
300
will be explained.
FIG. 5
is a schematic view showing a roller-forming apparatus. As shown in
FIG. 5
, fin material
1
a
is rolled around a material roll
1
. A tension apparatus
2
gives a predetermined tension force to the fin material
1
a
fed from the material roll
1
. The tension apparatus
2
includes a weight tensioner
2
a
, and a roller tensioner
2
d
having a roller
2
b
and a spring
2
c
. The weight tensioner
2
a
gives a predetermined tension force to the fin material
1
a
due to gravity force. The roller
2
b
rotates along the proceeding of the fin material
1
a
. The spring
2
c
gives a predetermined tension force to the fin material
1
a
through the roller
2
b.
Since the tension apparatus
2
gives a predetermined tension force to the fin material
1
a
, fin height h of the corrugate fin bending-formed by a fin forming apparatus
3
is constantly attained. Here, the fin height h is defined by a height difference between the peak
112
a
,
212
a
and the valley
112
b
,
212
b
adjacent thereto.
The fin forming apparatus
3
bends the fin material
1
a
to form a plurality of rectangular peaks
112
a
,
212
a
and rectangular valleys
112
b
,
212
b
. Hereinafter, the peak
112
a
,
212
a
and the valley
112
b
,
212
b
are referred as a bent potion
1
b
. Further, the fin forming apparatus
3
forms louvers
112
d
,
212
d
on the flat portions
112
c
,
212
c.
The fin forming apparatus
3
includes a pair of gear-like forming rollers
3
a
having a cutter (not illustrated) on the tooth flank thereof. The cutter forms the louvers
112
d
,
212
d
. When the fin material
1
a
passes through the forming rollers
3
a
, the teeth of the forming roller
3
a
bends the fin material
1
a
to form the bent portion
1
b
, and the cutter forms the louvers
112
d
,
212
d
simultaneously.
A cutting apparatus
4
cuts the fin material
1
a
including the bent portions
1
b
and the louvers
112
d
,
212
d
. The fin material
1
a
is cut every predetermined length such that each corrugate fin has a predetermined number of bent portions
1
b
. A feeder
5
feeds the predetermined length fin material
1
a
toward a straightening apparatus
6
.
The feeder
5
includes a pair of gear-like feeding rollers
5
a
having a standard pitch being substantially the same as a distance between the adjacent bent potions
1
b.
When a fin pitch (distance between adjacent bent portions
1
b
) of the corrugate fin is designed small, pressure angle of the forming roller
3
a
is designed large, and when the fin pitch is designed large, the pressure angle is designed small. Here, a module difference between the forming roller
3
a
and the feeding roller
5
a
is within 10%, the corrugate fin is formed without changing the feeding roller
5
a.
The straightening apparatus
6
presses the bent portion
1
b
from a direction perpendicular to a ridge direction of the bent portion
1
b
to remove concaves and convexes from the bent portion
1
b
. The straightening apparatus
6
includes a pair of straightening rollers
6
a
,
6
b
catching the fin material
1
a
therebetween. The straightening rollers
6
a
,
6
b
rotates in accordance with the proceeding of the fin material
1
a
. The straightening rollers
6
a
,
6
b
are arranged in such a manner that a line extending through the rotation centers of the straightening rollers
6
a
,
6
b
is perpendicular to the proceeding direction of the fin material
1
a.
A brake apparatus
7
includes brake faces
7
a
,
7
b
. The brake faces
7
a
,
7
b
contact the plurality of bent portions
1
b
to generate friction force against the proceeding of the fin material
1
a
. The brake apparatus
7
is disposed at the proceeding forward side of the fin material
1
a
more than straightening apparatus
6
. The brake apparatus
7
presses to gather the fin material
1
a
such that the bent portions
1
b
contact each other, by feeding force of the feeding apparatus
5
and friction force generated at the brake faces
7
a
,
7
b.
A brake shoe
7
c
having the brake face
7
a
is rotatably supported at one end thereof, and a spring
7
d
is provided at the other end of the brake shoe
7
c
. The friction force generated at the brake faces
7
a
,
7
b
is adjusted by adjusting the deflection amount of the spring
7
d
. The brake shoe
7
c
and a plate
7
e
including the brake face
7
b
are made of die steel having good wear resistance.
An operation of the corrugate fin forming apparatus will be explained.
The fin material
1
a
is drawn from the material roll
1
(drawing process). The tension apparatus
2
gives the predetermined tension force to the fin material
1
a
in the proceeding direction of the fin material
1
a
(tensioning process). The fin forming apparatus
3
forms the bent portions
1
b
and the louvers of the fin material
1
a
(fin forming process). The cutting apparatus
4
cuts the fin material
1
a
every predetermined length.
Next, the feeding apparatus
5
feeds the predetermined length fin material
1
a
toward the straightening apparatus
6
(feeding process), and the straightening apparatus
6
presses the bent portions
1
b
to remove the concaves and convexes from the bent portions
1
b
(straightening process). After that, the brake apparatus
7
presses to gather the fin material
1
a
so that the adjacent bent portions
1
b
contact each other (gathering process).
After the gathering process, the fin material
1
a
expands, due to the resilient force thereof, to have a predetermined fin pitch, and after an inspection, the corrugate fin forming is completed.
FIG. 6
is a graph showing heat exchanging performances of the condenser core portion
110
and the radiator core portion
210
in accordance with a ratio of the integrated fin
300
shown in
FIG. 3A
(hereinafter, referred as integrated fin
300
a
) to the integrated fin
300
shown in
FIG. 3B
(hereinafter, referred as integrated fin
300
b
). A linier line L
1
extending through point A and point 0 denotes the heat exchanging performances when the integrated fin
300
a
is used for the entire heat exchanging portion
330
.
While the ratio of the integrated fin
300
b
relative to the integrated fin
300
a
increases, linier line denoting the heat exchanging performances of the condenser core portion
110
and the radiator core portion
210
slides from L
1
to L
3
through L
2
. The linier line L
3
denotes the heat exchanging performances when the integrated fin
300
b
is used for the entire heat exchanging portion
330
.
As described above, according to the present embodiment, since the integrated fin
300
a
,
300
b
introducing different heat exchanging performances are appropriately arranged, required heat exchanging performance is easily attained with low cost.
Second Embodiment
In the second embodiment, a compound heat exchanger
700
is used for a hybrid car. The hybrid car includes an engine and an electric motor, and switches them to attain a driving source. The engine is mainly used to generate electric power for the motor, and the motor is mainly used for driving the hybrid car.
In the hybrid car, in addition to the engine, an electronic part such as an inverter controlling the motor has to be also cooled. For cooling the engine, the radiator has to be designed such that engine coolant temperature is less than 100-110° C. For cooling the electronic part, the radiator has to be designed such that electric part coolant is less than 60-70° C. which is lower than the engine coolant temperature.
In a vehicle having an automotive air conditioner, since the maximum refrigerant temperature is 80-90° C. which is lower than the engine coolant, the condenser for cooling the high-pressure refrigerant is disposed at air upstream side more than the radiator.
In the second embodiment, as shown in
FIG. 7
, a second radiator
500
for cooling the electric part is provided in addition to a first radiator
200
for cooling the engine coolant. The second radiator
500
has the same structure as the first radiator
200
, and is integrated with the first radiator
200
by tanks.
As shown in
FIG. 7
, the second radiator
500
includes a second radiator core portion
510
where the electric part coolant is heat-exchanged with the air. The second radiator core portion
510
has a plurality of second radiator tubes
511
through which the electric part coolant flows, and a plurality of second radiator fins
512
provided between the adjacent second radiator tubes
511
. A second radiator inlet tank
520
is disposed at one end of the second radiator tubes
511
, and a second radiator outlet tank
530
is disposed at the other end of the second radiator tubes
511
. The second radiator inlet tank
520
distributes the electric part coolant into each second radiator tube
511
, and the second radiator outlet tank
530
receives the electric part coolant from each second radiator tube
511
.
The first radiator inlet tank
220
and the second radiator inlet tank
520
are integrated within a cylindrical inlet tank having rectangular shape in cross section. Similarly, the first radiator outlet tank
230
and the second radiator outlet tank
530
are integrated within a cylindrical outlet tank having rectangular shape in cross section. Inside the inlet tank, a partition plate
521
partitions the second radiator inlet tank
520
from the first radiator inlet tank
220
. Similarly, inside the outlet tank, a partition plate
531
partitions the second radiator outlet tank
530
from the first radiator outlet tank
230
.
In this way, the first radiator core
210
and the second radiator core
510
are disposed in parallel with the air flow direction, and the condenser core
110
is disposed at the air upstream side of both radiator cores
210
,
510
in series therewith.
The integrated fin
300
, as shown in
FIG. 8
, is connected to the outer surface of the tubes
111
,
211
, and
511
for promoting the heat exchanging performance, and extends over the tubes
111
and
211
, and the tubes
111
and
511
. According to an example shown in
FIG. 8
, the number of the louvers
212
d
and
512
d
are different between in the first radiator
200
and the second radiator
500
. That is, the integrated fin
300
a
is used for the first radiator
200
, and the integrated fin
300
b
is used for the second radiator
500
.
Here, alternatively, as shown in
FIG. 9
, the number of louvers may be different within the condenser core
110
.
Modifications
According to the above-described embodiments, the number of louvers is different within the heat exchanging portion
330
. Alternatively, etching angle of the louver, etching length of the louver, fin pitch P of the louver may be different between at one area and another area within the heat exchanging core portion
330
.
According to the above-described embodiments, the roller forming apparatus produces the integrated fin
300
. Alternatively, a pressing apparatus or the like may produce the integrated fin.
According to the above-described embodiments, the compound heat exchanger is used for the cooling module including the condenser and the radiator. Alternatively, the double heat exchanger may be used for other heat exchangers.
According to the above-described embodiments, arrangements of louvers are different between at the upper area and the lower area with respect to the line III—III in FIG.
1
. Alternatively, arrangements of the louvers may be different between at right area and left area in
FIG. 1
, or the louvers
300
a
and
300
b
may be alternately arranged.
Claims
- 1. A heat exchanger comprising:a first core portion to carry out a heat exchange between a first fluid and an external fluid, said first core portion including a plurality of first tubes through which the first fluid flows and first cooling fins disposed between said each pair of adjacent first tubes; and a second core portion disposed in series with said first core portion in an external fluid flow direction with a predetermined clearance therebetween, to carry out a heat exchange between a second fluid and the external fluid, said second core portion including a plurality of second tubes through which the second fluid flows and second cooling fins disposed between said each pair of adjacent second tubes, wherein each of said first cooling fins and said second cooling fins is integrated by a connecting portion, and one of said first cooling fins and said second cooling fins introduce different cooling performances between a first area and a second area within a respective one of said first core portion and said second core portion.
- 2. A heat exchanger according to claim 1, whereinsaid first cooling fins and said second cooling fins include a plurality of louvers, respectively, and arrangements of said louvers within said one of said first cooling fins and said second cooling fins are different between said first area and said second area of said respective one of said first core portion and said second core portion.
- 3. A heat exchanger according to claim 2, wherein the number of said louvers within said one of said first cooling fins and said second cooling fins are different between said first area and said second area of said respective one of said first core portion and said second core portion.
- 4. A heat exchanger according to claim 1, wherein said first and second cooling fins are formed by a roller forming apparatus for continuously forming a plate material into a predetermined shape while rotating.
- 5. A compound heat exchanger including a refrigerant condenser and an engine coolant radiator, comprising:a condenser core portion to carry out a heat exchange between a refrigerant and air, said condenser core portion including a plurality of condenser tubes through which the refrigerant flows and condenser fins disposed between said each pair of adjacent condenser tubes; and a radiator core portion disposed in series with said condenser core portion in an air flow direction with a predetermined clearance therebetween, to carry out a heat exchange between an engine coolant and the air, said radiator core portion including a plurality of radiator tubes through which the engine coolant flows and radiator fins disposed between said each pair of adjacent radiator tubes; wherein each of said condenser fins and said radiator fins are integrated by a connecting portion, and one of said condenser fins and said radiator fins introduce different cooling performances between a first area and a second area within a respective one of said condenser core portion and said radiator core portion.
- 6. A compound heat exchanger according to claim 5, whereinsaid condenser fins and said radiator fins include a plurality of louvers, respectively, and arrangements of said louvers within said one of said condenser fins and said radiator fins are different between said first area and said second area said respective one of said condenser core portion and said radiator core portion.
- 7. A compound heat exchanger according to claim 6, wherein the number of said louvers within said one of said condenser fins and said radiator fins are different between said first area and said second area of said respective one of said condenser core portion and said radiator core portion.
- 8. A compound heat exchanger according to claim 5, whereinsaid radiator core portion includes a first radiator core portion and a second radiator core portion, said first radiator core portion includes a plurality of first radiator tubes through which the engine coolant flows and first radiator fins disposed between said each pair of adjacent first radiator tubes; said second radiator core portion includes a plurality of second radiator tubes through which an electronic part coolant flows and second radiator fins disposed between said each pair of adjacent second radiator tubes, and said first radiator fins and said second radiator fins introduce cooling performances different from each other.
- 9. A compound heat exchanger according to claim 8, wherein said first radiator fins introduce cooling performance is more than said second radiator fins.
- 10. A heat exchanger comprising:a heat exchanging core portion including: a first core portion to carry out a heat exchange between a first fluid and an external fluid, said first core portion including a plurality of first tubes through which the first fluid flows and first cooling fins disposed between said each pair of adjacent first tubes; a second core portion disposed in series with said first core portion in an external fluid flow direction with a predetermined clearance therebetween, to carry out a heat exchange between a second fluid and the external fluid, said second core portion including a plurality of second tubes through which the second fluid flows and second cooling fins disposed between said each pair of adjacent second tubes; and a third core portion disposed in series with said first core portion in the external fluid flow direction with a predetermined clearance therebetween, and disposed in parallel with said second core portion in the external fluid flow direction to carry out a heat exchange between a third fluid and the external fluid, said third core portion including a plurality of third tubes through which the third fluid flows and third cooling fins disposed between said each pair of adjacent third tubes, wherein each of some first cooling fins and said second cooling fins is integrated by a connecting portion, each of remaining first cooling fins and said third cooling fins is integrated by a connecting portion, and said first cooling fins, said second cooling fins and said third cooling fins introduce different cooling performances between one area and another area within said heat exchanging core portion.
- 11. A heat exchanger according to claim 10, wherein said second cooling fins and said third cooling fins introduce different cooling performances from each other.
- 12. A heat exchanger according to claim 10, wherein said first cooling fins introduce different cooling performances between at one area and another area within said first core portion.
- 13. A heat exchanger comprising:a core portion to carry out heat exchange between an internal fluid and an external fluid, said core portion including a first plurality of tubes through which the first fluid flows and a first plurality of cooling fins disposed between said each pair of adjacent first tubes, wherein said first cooling fins are arranged to achieve a first cooling performance; and a second plurality of tubes through which the first fluid flows and a second plurality of cooling fins disposed between each pair of adjacent second tubes, wherein said second plurality of cooling fins are arranged to achieve a second cooling performance, wherein said second cooling performance is different from said first cooling performance.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-079350 |
Mar 2000 |
JP |
|
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0 866 298 |
Sep 1998 |
EP |