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(11) | EP 2 613 116 A1 |
(12) | EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | HEAT EXCHANGER AND VEHICLE AIR CONDITIONER WITH SAME |
(57) Provided is a heat exchanger whose air pressure loss is small and whose exchanged
heat is large. The heat exchanger includes flat tubes, each having therein a plurality
of refrigerant circulation holes, and fins fixed to the flat surfaces of the flat
tubes, wherein the flat tubes and the fins are alternately stacked to form the heat
exchanger. (W - t1 - t2) × Hp × Hf / N is set to 3.95 or greater and 10.0 or less,
where de is the equivalent diameter of the plurality of the refrigerant circulation
holes, W is the width of each of the flat tubes, t1 is the wall thickness of each
of the flat tubes at one end in the widthwise direction corresponding to the distance
from the refrigerant circulation hole closest to the one end, t2 is the wall thickness
of each of the flat tubes at the other end in the widthwise direction corresponding
to the distance from the refrigerant circulation hole closest to the other end, Hp
is the height of each of the flat tubes in the stacking direction, Hf is the height
of the fins in the stacking direction, and N is the number of the refrigerant circulation
holes, and the equivalent diameter de is set to 0.5 or more and 0.8 or less, and the
flat tube width W is set to 12 mm or more and 16 mm or less. |
{Technical Field}
{Background Art}
{Citation List}
{Patent Literature}
{Summary of Invention}
{Technical Problem}
{Solution to Problem}
{Advantageous Effects of Invention}
{Brief Description of Drawings}
{Fig. 1} Fig. 1 is a front view of a condenser of a vehicle air conditioner according to an embodiment of the present invention.
{Fig. 2} Fig. 2 is a transverse cross-sectional view of a flat tube in Fig. 1.
{Fig. 3} Fig. 3 is a front view of corrugated fins in Fig. 1.
{Fig. 4} Fig. 4 is a graph showing the simulation results of the condenser shown in Fig. 1 plotted against a polynomial.
{Fig. 5} Fig. 5 is a graph showing the simulation results of the condenser shown in Fig. 1 plotted against an equivalent diameter.
{Description of Embodiment}
inlet air temperature Tai = 35 °C
inlet refrigerant pressure Pri = 1.744 MPa frontal air velocity Fvi = 4.5 m/s
the degree of superheating at refrigerant inlet SH = 20K
the degree of supercooling at refrigerant outlet SC = 10K
fin pitch Pf = 1.6 mm or more and 2.0 mm or less.
W: the width of each of the flat tubes 14
t1: the wall thickness of each of the flat tubes 14 at one end in the widthwise direction corresponding to the distance from the refrigerant circulation hole 20 closest to the one end (the left end in Fig. 2)
t2: the wall thickness of each of the flat tubes 14 at the other end in the widthwise direction corresponding to the distance from the refrigerant circulation hole 20 closest to the other end (the right end in Fig. 3)
Hp: the height of each of the flat tubes 14 in the stacking direction (in the vertical direction)
Hf: the height of the corrugated fins 15 in the stacking direction (in the vertical direction)
N: the number of refrigerant circulation holes 20.
1 | condenser (heat exchanger) |
13 | core portion |
14 | flat tube |
15 | corrugated fins |
W | flat tube width |
t1 | wall thickness at one end |
t2 | wall thickness at the other end |
Hp | height of flat tube in the stacking direction |
Hf | height of corrugated fins in the stacking direction |
Pf | fin pitch of corrugated fins |
N | number of refrigerant circulation holes |
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description