U.S. patent application number 14/353754 was filed with the patent office on 2014-10-16 for in-chamber condenser.
The applicant listed for this patent is SANDEN CORPORATION. Invention is credited to Yusuke Iino, Shinji Kouno, Yuuichi Matsumoto.
Application Number | 20140305158 14/353754 |
Document ID | / |
Family ID | 48289946 |
Filed Date | 2014-10-16 |
United States Patent
Application |
20140305158 |
Kind Code |
A1 |
Kouno; Shinji ; et
al. |
October 16, 2014 |
In-Chamber Condenser
Abstract
An interior condenser (1, 32) which is accommodated in an HVAC
unit of a vehicle air-condoning heat pump system, the interior
condenser including: a heat exchange core (6) that is composed of
stacked tubes (2) and fins (4); a refrigerant inflow/outflow-side
tank (10, 34) to which one end portions of the tubes are connected;
a refrigerant turn-side tank (12) to which the other end portions
of the tubes are connected; a partition wall (14) that separates an
inner portion of the refrigerant inflow/outflow-side tank into a
refrigerant inflow chamber (16) and a refrigerant outflow chamber
(18); a refrigerant inlet tube (28) that is connected to the
refrigerant inflow/outflow-side tank to communicate with the
refrigerant inflow chamber; and a refrigerant outlet tube (30) that
is connected to the refrigerant inflow/outflow-side tank to
communicate with the refrigerant outflow chamber, wherein the
refrigerant outlet tube is connected to the refrigerant
inflow/outflow-side tank at a position below the core.
Inventors: |
Kouno; Shinji; (Isesaki-shi,
JP) ; Iino; Yusuke; (Isesaki-shi, JP) ;
Matsumoto; Yuuichi; (Isesaki-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SANDEN CORPORATION |
Gunma |
|
JP |
|
|
Family ID: |
48289946 |
Appl. No.: |
14/353754 |
Filed: |
November 2, 2012 |
PCT Filed: |
November 2, 2012 |
PCT NO: |
PCT/JP2012/078490 |
371 Date: |
April 23, 2014 |
Current U.S.
Class: |
62/506 ;
165/151 |
Current CPC
Class: |
F28F 1/126 20130101;
F28F 9/0214 20130101; F28D 1/05325 20130101; F25B 2500/09 20130101;
F25B 2500/01 20130101; F28D 2021/0084 20130101; F25B 39/04
20130101; F25B 40/02 20130101; F28D 1/05391 20130101 |
Class at
Publication: |
62/506 ;
165/151 |
International
Class: |
F28D 1/053 20060101
F28D001/053; F28F 1/12 20060101 F28F001/12; F25B 39/04 20060101
F25B039/04 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 7, 2011 |
JP |
2011-243557 |
Claims
1. An interior condenser which is accommodated in an HVAC unit of a
vehicle air-conditioning heat pump system, the interior condenser
comprising: a heat exchange core that is composed of stacked tubes
and fins; a refrigerant inflow/outflow-side tank to which one end
portions of the tubes are connected; a refrigerant turn-side tank
to which the other end portions of the tubes are connected; a
partition wall that separates an inner portion of the refrigerant
inflow/outflow-side tank into a refrigerant inflow chamber and a
refrigerant outflow chamber; a refrigerant inlet tube that is
connected to the refrigerant inflow/outflow-side tank to
communicate with the refrigerant inflow chamber; and a refrigerant
outlet tube that is connected to the refrigerant
inflow/outflow-side tank to communicate with the refrigerant
outflow chamber, wherein the refrigerant outlet tube is connected
to the refrigerant inflow/outflow-side tank at a position below the
core.
2. The interior condenser according to claim 1, wherein the core is
composed of a forward-side core section in which a refrigerant
performs heat exchange after passing through the refrigerant
inflow/outflow-side tank from the refrigerant inlet tube, and a
return-side core section in which the refrigerant performs heat
exchange after passing through the forward-side core section and
the refrigerant turn-side tank, and the refrigerant inlet tube and
the refrigerant outlet tube are connected to the refrigerant
inflow/outflow-side tank at a point-symmetrical position with
respect to the partition wall as a symmetrical axis, and at a
position overlapping each other as viewed from a direction
perpendicular to the partition wall.
3. The interior condenser according to claim 2, wherein the
refrigerant inlet tube and the refrigerant outlet tube are
connected to the refrigerant inflow/outflow-side tank at a
line-symmetrical position with respect to the partition wall as the
symmetrical axis.
Description
TECHNICAL FIELD
[0001] The present invention relates to an interior condenser, and
more particularly to an interior condenser accommodated in an HVAC
unit of a vehicle air-conditioning heat pump system.
BACKGROUND ART
[0002] As this type of condenser, for example, there is known a
heat exchanger used in a refrigerant circuit of a vehicle
air-conditioning system, and including a heat exchange core
composed of vertically-stacked tubes and fins, a refrigerant
inflow/outflow-side tank where one end portions of the tubes are
connected to a side portion, a refrigerant turn-side tank where the
other end portions of the tubes are connected to a side portion, a
partition wall that separates an inner portion of the refrigerant
inflow/outflow-side tank into a refrigerant inflow chamber and a
refrigerant outflow chamber, a refrigerant inlet tube connected to
the refrigerant inflow/outflow-side tank to communicate with the
refrigerant inflow chamber, and a refrigerant outlet tube connected
to the refrigerant inflow/outflow-side tank to communicate with the
refrigerant outflow chamber (for example, see Patent Document
1).
[0003] The core is composed of a forward-side core section in which
a refrigerant performs heat exchange after passing through the
refrigerant inflow/outflow-side tank from the refrigerant inlet
tube, and a return-side core section in which the refrigerant
performs heat exchange after passing through the forward-side core
section and the refrigerant turn-side tank, and employs a so-called
counter flow-type refrigerant horizontal flow in which the
refrigerant flows in a horizontal direction sequentially from the
forward-side core section to the return-side core section, thereby
enabling effective heat exchange between air ventilating the core
and the refrigerant.
PRIOR ART DOCUMENT
Patent Document
[0004] Patent Document 1: Japanese Patent No. 4334311
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0005] When the heat exchanger of the above conventional technique
is accommodated in an HVAC (Heating Ventilation & Air
Conditioning) unit of a vehicle air-conditioning heat pump system
and used as an interior condenser whose so-called subcool degree
S.C (deg) is increased, a refrigerant temperature can be
effectively decreased in the core, and a liquid refrigerant can be
increased. Accordingly, the liquid refrigerant can be reliably
caused to flow into an expansion valve provided downstream of the
condenser in the refrigerant circuit.
[0006] However, in the conventional technique, the refrigerant
outlet tube is connected above a lower end portion of the core, so
that the liquid refrigerant may be accumulated in a tube located
below the refrigerant outlet tube, or may flow back in the tube. A
refrigerant flow in the return-side core section is thereby
deteriorated, resulting in an uneven refrigerant temperature
distribution in a low-temperature region (subcool region)
particularly near the refrigerant outlet tube in the return-side
core section. Therefore, a temperature of air blown off from an air
outlet of the vehicle air-conditioning system into a vehicle
interior may differ, for example, between a driver-seat air outlet
and a passenger-seat air outlet, and a blowoff air temperature in
the HVAC unit may become uneven.
[0007] Also, in the conventional technique, the refrigerant inlet
tube is connected to the side portion of the refrigerant
inflow/outflow-side tank at a misaligned position above the
refrigerant outlet tube, so that a high temperature region
(superheat region) near the refrigerant inlet tube having a
relatively high temperature in the forward-side core section, and
the low temperature region (subcool region) near the refrigerant
outlet tube having a relatively low temperature in the return-side
core section exist at a misaligned position without overlapping
each other. Therefore, a temperature offset through heat exchange
between sensible heat portions of the superheat region in the
forward-side core section and the subcool region in the return-side
core section is not smoothly performed. As a result, the unevenness
in the refrigerant temperature distribution in the subcool region
particularly near the refrigerant outlet tube in the return-side
core section, and eventually, variation in the blowoff air
temperature may be further increased.
[0008] The present invention has been made based on the above
circumstances, and an object of the present invention is to provide
an interior condenser capable of reducing variation in a blowoff
air temperature at respective air outlets in an HVAC unit.
Means for Solving the Problems
[0009] In order to achieve the above object, an interior condenser
of the present invention is an interior condenser which is
accommodated in an HVAC unit of a vehicle air-conditioning heat
pump system, the interior condenser including: a heat exchange core
that is composed of stacked tubes and fins; a refrigerant
inflow/outflow-side tank to which one end portions of the tubes are
connected; a refrigerant turn-side tank to which the other end
portions of the tubes are connected; a partition wall that
separates an inner portion of the refrigerant inflow/outflow-side
tank into a refrigerant inflow chamber and a refrigerant outflow
chamber; a refrigerant inlet tube that is connected to the
refrigerant inflow/outflow-side tank to communicate with the
refrigerant inflow chamber; and a refrigerant outlet tube that is
connected to the refrigerant inflow/outflow-side tank to
communicate with the refrigerant outflow chamber, wherein the
refrigerant outlet tube is connected to the refrigerant
inflow/outflow-side tank at a position below the core.
[0010] Preferably, the core is composed of a forward-side core
section in which a refrigerant performs heat exchange after passing
through the refrigerant inflow/outflow-side tank from the
refrigerant inlet tube, and a return-side core section in which the
refrigerant performs heat exchange after passing through the
forward-side core section and the refrigerant turn-side tank, and
the refrigerant inlet tube and the refrigerant outlet tube are
connected to the refrigerant inflow/outflow-side tank at a
point-symmetrical position with respect to the partition wall as a
symmetrical axis, and at a position overlapping each other as
viewed from a direction perpendicular to the partition wall.
[0011] Preferably, the refrigerant inlet tube and the refrigerant
outlet tube are connected to the refrigerant inflow/outflow-side
tank at a line-symmetrical position with respect to the partition
well as the symmetrical axis.
Advantageous Effects of the Invention
[0012] According to the present invention, since the refrigerant
outlet tube is connected to the refrigerant inflow/outflow-side
tank at a position below the core, the refrigerant flowing through
the core can be sequentially guided to the refrigerant
inflow/outflow-side tank and the refrigerant outlet tube by
gravity, thereby preventing accumulation of a liquid refrigerant in
a tube due to the tube being located below the refrigerant outlet
tube, and backward flow of the liquid refrigerant in the tube.
Therefore, the refrigerant can be caused to smoothly flow through
all the tubes, thereby suppressing unevenness in a refrigerant
temperature distribution in a subcool region particularly near the
refrigerant outlet tube in the return-side core section, and
eventually suppressing unevenness in a refrigerant temperature
distribution in the entire core. Accordingly, variation in a
blowoff air temperature at respective air outlets in the HVAC unit
can be reduced.
[0013] Also, according to the present invention, since the
refrigerant inlet tube and the refrigerant outlet tube are
connected to the refrigerant inflow/outflow-side tank at a
point-symmetrical position with respect to the partition wall as a
symmetrical axis, and at a position overlapping each other as
viewed from a direction perpendicular to the partition wall, the
core can be formed such that a superheat region near the
refrigerant inlet tube having a relatively high temperature in the
forward-side core section, and the subcool region near the
refrigerant outlet tube having a relatively low temperature in the
return-side core section overlap each other in at least one
portion. Therefore, the unevenness in the refrigerant temperature
distribution in the entire core can be effectively suppressed by a
temperature offset through heat exchange between sensible heat
portions of the superheat region in the forward-side core section
and the subcool region in the return-side core section. The
variation in the blowoff air temperature at the respective air
outlets in the HVAC unit can be effectively reduced.
[0014] Also, according to the present invention, since the
refrigerant inlet tube and the refrigerant outlet tube are
connected to the refrigerant inflow/outflow-side tank at a
line-symmetrical position with respect to the partition wall as the
symmetrical axis, the core can be formed such that the superheat
region and the subcool region completely overlap each other.
Therefore, the unevenness in the refrigerant temperature
distribution in the entire core can be more effectively suppressed
by the temperature offset through the heat exchange between the
sensible heat portions of the superheat region in the forward-side
core section and the subcool region in the return-side core
section. The variation in the blowoff air temperature at the
respective air outlets in the HVAC unit can be more effectively
reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a front view illustrating a schematic
configuration of a condenser according to one embodiment of the
present invention.
[0016] FIG. 2 is a bottom view of the condenser in FIG. 1 as viewed
from below.
[0017] FIG. 3 is a sectional view of the condenser in FIG. 1 in a
direction of A-A.
[0018] FIG. 4 is a graph illustrating a maximum temperature
difference .DELTA.Tmax (.degree. C.) of outlet air ventilating a
conventional condenser and the condenser of the present embodiment
in relation to an increase in a subcool degree S.C (deg).
[0019] FIG. 5 is a front view illustrating a schematic
configuration of a condenser according to another embodiment of the
present invention.
[0020] FIG. 6 is a bottom view of the condenser in FIG. 5 as viewed
from below.
[0021] FIG. 7 is a side view of the condenser in FIG. 5 as viewed
from a right side.
[0022] FIG. 8 is a sectional view of the condenser in FIG. 5 in a
direction of B-B.
MODE FOR CARRYING OUT THE INVENTION
[0023] In the following, a condenser 1 according to one embodiment
of the present invention is described by reference to the
drawings.
[0024] FIG. 1 is a front view schematically illustrating a
schematic configuration of the condenser 1. FIG. 2 is a bottom view
of the condenser 1 in FIG. 1 as viewed from below. FIG. 3 is a
sectional view of the condenser 1 in FIG. 1 in a direction of
A-A.
[0025] For example, the condenser 1 is an interior condenser that
is incorporated in a refrigerant circuit constituting a heat pump
cycle of an unillustrated vehicle air-conditioning heat pump
system, and accommodated in an unillustrated HVAC (Heating
Ventilation & Air Conditioning) unit of the vehicle
air-conditioning heat pump system.
[0026] In the condenser 1, a plurality of tubes 2 forming a
refrigerant channel are arranged in a vertical direction, and a
colligated fin (fin) 4 is bonded between the respective tubes 2.
The fin 4 forms an air ventilation channel in the condenser 1,
thereby promoting heat exchange between a refrigerant flowing
through the respective tubes 2 and outside air. The tubes 2 and the
fins 4 are alternately arrayed and stacked in the vertical
direction, to form a heat exchange core 6, the upper and lower end
portions of which are covered with side plates 8.
[0027] While a refrigerant inflow/outflow-side tank 10, to which
right end portions of the tubes 2 are connected, is arranged at a
right end portion of the core 6, a refrigerant turn-side tank 12,
to which left end portions of the tubes 2 are connected, is
arranged et a left end portion of the core 6.
[0028] As shown in FIGS. 2 and 3, an inner portion of the
refrigerant inflow/outflow-side tank 10 is completely separated
into a refrigerant inflow chamber 16 and a refrigerant outflow
chamber 18 by a partition wall 14 that is extended in an array
direction of the tubes 2, i.e., a longitudinal direction of the
refrigerant inflow/outflow-side tank 10. Meanwhile, an inner
portion of the refrigerant turn-side tank 12 is also separated into
a refrigerant inflow chamber 24 and a refrigerant outflow chamber
26 by a partition wall 22 that is extended in the array direction
of the tubes 2, i.e., a longitudinal direction of the refrigerant
turn-side tank 12, and through which a plurality of communication
holes 20 are pierced.
[0029] Also, a refrigerant inlet tube 28 and a refrigerant outlet
tube 30 are connected to a bottom end portion 10a of the
refrigerant inflow/outflow-side tank 10. The refrigerant inlet tube
28 communicates with the refrigerant inflow chamber 16, and the
refrigerant outlet tube 30 communicates with the refrigerant
outflow chamber 18.
[0030] Also, the core 6 is composed of a forward-side core section
6A into which the refrigerant flows after passing through the
refrigerant inflow chamber 16 of the refrigerant
inflow/outflow-side tank 10 from the refrigerant inlet tube 28, and
a return-side core section 6B into which the refrigerant flows
after passing through the refrigerant inflow chamber 24, the
communication holes 20, and the refrigerant outflow chamber 26 of
the refrigerant turn-side tank 12 from the forward-side core
section 6A.
[0031] The condenser 1 having the above configuration employs a
so-called counter flow type in which the refrigerant flows in a
horizontal direction sequentially from the forward-side core
section 6A to the return-side core section 6B, thereby enabling
effective heat exchange between air ventilating the core 6 and the
refrigerant flowing through the core 6.
[0032] Here, in the present embodiment, the refrigerant inlet tube
28 and the refrigerant outlet tube 30 are connected to the bottom
end portion 10a of the refrigerant inflow/outflow-side tank 10 as
described above, and the bottom end portion 10a of the refrigerant
inflow/outflow-side tank 10 is located below a bottommost tube 2a
out of the respective tubes 2. In other words, the refrigerant
inlet tube 28 and the refrigerant outlet tube 30 are connected to
the refrigerant inflow/outflow-side tank 10 at a position below the
core 6.
[0033] Also, as shown in FIG. 3, the refrigerant inlet tube 28 and
the refrigerant outlet tube 30 are connected to the refrigerant
inflow/outflow-side tank 10 at a line-symmetrical position with
respect to the partition wall 14 as a symmetrical axis with
distances d from the partition wall 14 to tube centers of the
refrigerant inlet tube 28 and the refrigerant outlet tube 30 being
almost the same.
[0034] Moreover, an inner diameter Do of the refrigerant outlet
tube 30 is set to an inner diameter Di of the refrigerant inlet
tube 28 or more in advance.
[0035] In the condenser 1 of the present embodiment, since the
refrigerant outlet tube 30 is connected to the refrigerant
inflow/outflow-side tank 10 at a position below the core 6 as
described above, the refrigerant flowing through the core 6 can be
sequentially guided to the refrigerant inflow/outflow-side tank 10
and the refrigerant outlet tube 30 by gravity thereby preventing
accumulation of a liquid refrigerant in a tube 2 due to the tube 2
being located below the refrigerant outlet tube 30, and backward
flow of the id refrigerant in the tube 2. Therefore, the
refrigerant can be caused to smoothly flow through all the tubes 2,
thereby suppressing unevenness in a refrigerant temperature
distribution in a low-temperature region (subcool region)
particularly near the refrigerant outlet tube in the return-side
core section, and eventually suppressing unevenness in a
refrigerant temperature distribution in the entire core 6.
Accordingly, variation in a blowoff air temperature at respective
air outlets such as a foot air outlet in the HVAC unit can be
reduced.
[0036] Also, since the refrigerant inlet tube 28 and the
refrigerant cutlet tube 30 are connected to the refrigerant
inflow/outflow-side tank 10 at a line-symmetrical position with
respect to the partition wall 14 as a symmetrical axis, the core 6
can be formed such that a high-temperature region (superheat
region) near the refrigerant inlet tube 28 having a relatively high
temperature in the forward-side core section 6A, and the
low-temperature region (subcool region) near the refrigerant outlet
tube 30 having a relatively low temperature in the return-side core
section 6B completely overlap each other. Therefore, the unevenness
in the refrigerant temperature distribution in the entire core 6
can be more effectively suppressed by a temperature offset through
heat exchange between sensible heat portions of the superheat
region in he forward-side core section 6A and the subcool region in
the return-side core section 6B. The variation in the blowoff air
temperature at the respective air outlets in the HVAC unit can be
more effectively reduced.
[0037] Also, since the inner diameter Do of the refrigerant outlet
tube 30 is equal to or more than the inner diameter Di of the
refrigerant inlet tube 28, the refrigerant easily flows out of the
refrigerant outlet tube 30, so that the refrigerant can be caused
to flow more smoothly in the tubes 2. Therefore, the unevenness in
the refrigerant temperature distribution in the entire core 6 can
be more effectively suppressed, and the variation in the blowoff
air temperature at the respective air outlets in the HVAC unit can
be more effectively reduced.
[0038] The effect is specifically described by reference to a graph
illustrating a maximum temperature difference .DELTA.Tmax (.degree.
C.) of outlet air that is air after ventilating the condenser 1 in
relation to an increase in a subcool degree S.C (deg) in FIG. 4. In
the graph, a dashed line indicates a case of a conventional counter
flow-type condenser having the core 6 in which the refrigerant
vertically flows, and a solid line indicates the case of the
present embodiment. A case in which the condenser 1 shown in FIG. 1
is used in a state rotated clockwise through 90.degree. is assumed
as the conventional condenser, whereby the refrigerant cannot be
guided by use of gravity due to the arrangement position of the
refrigerant outlet tube. Thus, the refrigerant is accumulated or
flows back around the refrigerant outlet tube in the return-side
core section.
[0039] As is clear from the result, in the case of the present
embodiment, the maximum temperature difference .DELTA.Tmax of the
outlet air can be made lower by about 10.degree. C. than that of
the conventional condenser at any value of the sub-cool decree S.
C. It is understood that the unevenness in the refrigerant
temperature distribution in the entire core 6 can be effectively
suppressed.
[0040] The present invention should not be limited to the
aforementioned embodiment, and various modifications may be made
therein.
[0041] For example, although the refrigerant inlet tube 28 and the
refrigerant outlet tube 30 are connected to the bottom end portion
10a of the refrigerant inflow/outflow-side tank 10 in the above
embodiment, the present invention is not limited to the above
embodiment as long as the refrigerant outlet tube 30 is connected
to the refrigerant inflow/outflow-side tank 10 at a position below
the core 6.
[0042] To be more specific, a condenser of another embodiment of
the present invention is described by reference to FIGS. 5 to 8.
FIG. 5 is a front view schematically illustrating a schematic
configuration of a condenser 32. FIG. 6 is a bottom view of the
condenser 32 in FIG. 5 as viewed from below. FIG. 7 is a side view
of the condenser 32 in FIG. 5 as viewed from a right side. FIG. 8
is a sectional view of the condenser 32 in FIG. 5 in a direction of
B-B. The same components as those of FIG. 1 are assigned the same
reference numerals, and description is omitted.
[0043] As shown in FIGS. 5 to 7, a refrigerant inflow/outflow-side
tank 34 of the present embodiment has a larger longitudinal length
than the refrigerant turn-side tank 12, and a side portion 34a of
the refrigerant inflow/outflow-side tank 34 has a sufficient length
to a lower side from the bottommost tube 2a. Therefore, the
refrigerant inlet tube 28 and the refrigerant outlet tube 30 are
connected to a portion of the side portion 34a of the refrigerant
inflow/outflow-side tank 34 below the bottommost tube 2a, that is,
connected to the refrigerant inflow/outflow-side tank 34 at a
position below the core 6.
[0044] Also, as shown in FIG. 8, the refrigerant inlet tube 28 and
the refrigerant outlet tube 30 are connected to the refrigerant
inflow/outflow-side tank 34 at a line-symmetrical position with
respect to the partition wall 14 as a symmetrical axis with
distances d from the partition wall 14 to tube centers of the
refrigerant inlet tube 28 and the refrigerant outlet tube 30 being
almost the same. An inner diameter Do of the refrigerant outlet
tube 30 is set to an inner diameter Di of the refrigerant inlet
tube 2B or more in advance.
[0045] In the condenser 32 of the present embodiment, since the
refrigerant outlet tube 30 is connected to the refrigerant
inflow/outflow-side tank 34 at a position below the core 6 as
described above, the accumulation of the liquid refrigerant in the
tube 2, and the backward flow of the liquid refrigerant in the tube
2 can be prevented. Furthermore, the unevenness in the refrigerant
temperature distribution in the entire core 6 can be suppressed by
the temperature offset through the heat exchange between the
sensible heat portions of the superheat region in the forward-side
core section 6A and the subcool region in the return-side core
section 6B, and the variation in the blowoff air temperature at the
respective air outlets in the HVAC unit can be effectively
reduced.
[0046] Also, in the aforementioned respective embodiments, the
refrigerant inlet tube 28 and the refrigerant outlet tube 30 are
connected to the refrigerant inflow/outflow-side tank 34 at the
line-symmetrical position with respect to the partition wall 14 as
the symmetrical axis with the distances d from the partition wall
14 to the tube centers of the refrigerant inlet tube 28 and the
refrigerant outlet tube 30 being almost the same. However, the
present invention is not limited thereto, and the refrigerant inlet
tube 28 and the refrigerant outlet tube 30 may be connected to the
refrigerant inflow/outflow-side tank 34 at a point-symmetrical
position with respect to the partition wall 14 as the symmetrical
axis, and at a position overlapping each other as viewed from a
direction perpendicular to the partition wall 14.
[0047] In this case, the distances d from the partition wall 14 to
the tube centers of the refrigerant inlet tube 28 and the
refrigerant outlet tube 30 are almost the same. The core 6 can be
formed such that the superheat region near the refrigerant inlet
tube 28 having a relatively high temperature in the forward-side
core section 6A, and the subcool region near the refrigerant outlet
tube 30 having a relatively low temperature in the return-side core
section 6B overlap each other in at least one portion. Therefore,
the unevenness in the refrigerant temperature distribution in the
entire core 6 can be more effectively suppressed by the temperature
offset through the heat exchange between the sensible heat portions
of the superheat region in the forward-side core section 6A and the
subcool region in the return-side core section 6B. The variation in
the blowoff air temperature at the respective air outlets in the
HVAC unit can be effectively reduced.
[0048] Also, although the condensers 1 and 32 employing the counter
flow type in which the refrigerant flows in the horizontal
direction sequentially from the forward-side core section 6A to the
return-side core section 6B have been described in the
aforementioned respective embodiments, the condenser is not limited
to the forms of the condensers 1 and 32. To be more specific, the
same effects as those described above can be of course obtained
even in a counter flow-type condenser, such as the conventional
condenser assumed in the description of FIG. 4, in which the
refrigerant vertically flows, by connecting the refrigerant outlet
tube 30 to the refrigerant inflow/outflow-side tank 10 at a
position below the core 6, and connecting the refrigerant inlet
tube 28 and the refrigerant outlet tube 30 to the refrigerant
inflow/outflow-side tank 10 at a line-symmetrical position with
respect to the partition wall 14 as a symmetrical axis, or at a
point-symmetrical position with respect to the partition wall 14 as
the symmetrical axis, and at a position overlapping each other as
viewed from a direction perpendicular to the partition wall 14.
EXPLANATION OF REFERENCE SIGNS
[0049] 1, 32 Condenser (Interior condenser)
[0050] 2 Tube
[0051] 2a Bottommost tube (Tube)
[0052] 4 Fin
[0053] 6 Core
[0054] 6A Forward-side core section
[0055] 6B Return-side core section
[0056] 10, 34 Refrigerant inflow/outflow-side tank
[0057] 12 Refrigerant turn-side tank
[0058] 14 Partition well
[0059] 16 Refrigerant inflow chamber
[0060] 18 Refrigerant outflow chamber
[0061] 28 Refrigerant inlet tube
[0062] 30 Refrigerant outlet tube
* * * * *