US2024219067A1PendingUtilityA1
Heat exchanger, air-conditioning apparatus outdoor unit including heat exchanger, and air-conditioning apparatus including air-conditioning apparatus outdoor unit
Est. expiryMay 28, 2041(~14.9 yrs left)· nominal 20-yr term from priority
Inventors:Yoji OnakaTetsuji SaikusaRihito AdachiNanami KishidaTaisaku GomyoYuki NakaoShingo KasakiAtsushi KibeHiroyuki Morimoto
F25B 39/04F25B 2500/19F25B 49/02F25B 2600/2519F25B 2600/2513F25B 2313/0294F25B 2313/0293F25B 13/00F25B 47/025F28F 1/40F28F 2215/04F28F 1/126F28F 1/022F25B 39/00F24F 13/22F28D 1/05391
44
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Claims
Abstract
A heat exchanger mounted in an outdoor unit of an air-conditioning apparatus includes at least one heat exchanger core and a hot-gas refrigerant inlet formed in lower part of the heat exchanger and in which refrigerant flows when the heat exchanger functions as a condenser. Each heat exchanger core includes flat tubes extending in an up-down direction and are placed along a direction of flow of air. When a total flow passage cross-sectional area of each heat exchanger core is A [m 2 ]=a×N [m 2 ], where a [m 2 ] is a flow passage cross-sectional area of each flat tube and N is a number of the flat tubes, a height of each of the heat exchanger cores is H [m], a differential pressure of a refrigerant flow passage is ΔP HEX , and a liquid head is ΔP HEAD , ΔP HEX /ΔP HEAD =(5.94635×10 −4 ×A −1.75030 )/(8.4303H+0.8779)>1 is satisfied.
Claims
exact text as granted — not AI-modified1 . A heat exchanger that is mounted in an outdoor unit of an air-conditioning apparatus, the heat exchanger comprising one heat exchanger core or two or more heat exchanger cores each including a plurality of flat tubes that extend in an up-down direction and through which refrigerant flows as upward flows when the heat exchanger functions as a condenser, the two or more heat exchanger cores being placed along a direction of flow of air,
wherein in a case in which a total flow passage cross-sectional area of each of the heat exchanger cores is defined as A [m 2 ]=a×N [m 2 ], where a [m 2 ] is a flow passage cross-sectional area of each of the flat tubes and N is a number of the flat tubes, a height of each of the heat exchanger cores is defined as H [m], a differential pressure of a refrigerant flow passage is defined as ΔP HEX , and a liquid head is defined as ΔP HEAD ,
Δ
P
HEX
/
Δ
P
HEAD
=
(
5.94635
×
10
-
4
×
A
-
1.7503
)
/
(
8.4303
H
+
0.8779
)
>
1
is
satisfied
.
2 . The heat exchanger of claim 1 , further comprising a hot-gas refrigerant inlet formed in a lower part thereof when the heat exchanger functions as a condenser.
3 . The heat exchanger of claim 1 , further comprising a hot-gas refrigerant merging region formed in a lower part thereof when the heat exchanger functions as a condenser.
4 . The heat exchanger of claim 2 , comprising:
the one heat exchanger core; a first header provided at a lower end of the heat exchanger core; and a second header provided at an upper end of the heat exchanger core, wherein the hot-gas refrigerant inlet is formed at one end of the first header, the heat exchanger further comprising a liquid refrigerant outlet that is formed at one end of the second header located opposite the one end of the first header and through which refrigerant flows out when the heat exchanger functions as a condenser.
5 . The heat exchanger of claim 1 , comprising:
the one heat exchanger core; a first header provided at a lower end of the heat exchanger core; a second header provided at an upper end of the heat exchanger core; and a partition plate provided in at least the first header and configured to divide a flow passage of the heat exchanger core into a plurality of regions in a width direction, wherein in a case in which a width of the heat exchanger core is defined as L [m] and a width of a furthest downstream region of the heat exchanger core is defined as L 1 ,
20[%]≤ L 1 /L≤ 50[%] is satisfied.
6 . The heat exchanger of claim 2 , comprising:
the two or more heat exchanger cores placed along the direction of flow of air; a first header provided at a lower end of one of the heat exchanger cores that is located on a furthest leeward side; and a second header provided at an upper or lower end of one of the heat exchanger cores that is located at a furthest windward side, wherein the hot-gas refrigerant inlet is formed at one end of the first header, the heat exchanger further comprising: a liquid refrigerant outlet that is formed at one end of the second header located on a same side as the one end of the first header and through which refrigerant flows out when the heat exchanger functions as a condenser; and a bridging header provided at upper or lower ends of two adjacent ones of the heat exchanger cores and configured so that refrigerant converging from the flat tubes of one of the heat exchanger cores that is located on a leeward side is distributed to the flat tubes of one of the heat exchanger cores that is located on a windward side.
7 . The heat exchanger of claim 6 , wherein
an upper or lower end of each of the flat tubes of the two adjacent heat exchanger cores is inserted in the bridging header, and in a case in which a gap between the upper or lower end of the flat tube and a wall portion of the bridging header that faces the upper or lower end is defined as δ, δ≤3 [mm] is satisfied.
8 . The heat exchanger of claim 1 , wherein in a case in which a width of each of the heat exchanger cores is defined as L [m], H/L>1 is satisfied.
9 . The heat exchanger of claim 1 , wherein H≥0.42 [m] is satisfied.
10 . The heat exchanger of claim 1 , wherein each of the flat tubes is provided with a plurality of partition posts configured to partition an internal flow passage and an inward projecting portion provided between adjacent ones of the partition posts.
11 . The heat exchanger of claim 1 , wherein each of the flat tubes has a distal portion subjected to tube shrinking so that an outer diameter of the flat tube decreases toward a distal end.
12 . A heat exchanger that is mounted in an outdoor unit of an air-conditioning apparatus, the heat exchanger comprising one heat exchanger core or two or more heat exchanger cores each including a plurality of flat tubes that extend in an up-down direction and through which refrigerant flows as upward flows when the heat exchanger functions as a condenser, the two or more heat exchanger cores being placed along a direction of flow of air,
wherein in a case in which a total flow passage cross-sectional area of each of the heat exchanger cores in an upward flow region is defined as A r [m 2 ]=a×N r [m 2 ], where a [m 2 ] is a flow passage cross-sectional area of each of the flat tubes and N r is a number of the flat tubes through which hot-gas refrigerant flows as upward flows in the heat exchanger, a height of each of the heat exchanger cores is defined as H [m], a differential pressure of a refrigerant flow passage is defined as ΔP HEX , and a liquid head is defined as ΔP HEAD ,
Δ
P
HEX
/
Δ
P
HEAD
=
(
5.94635
×
10
-
4
×
A
r
-
1.7503
)
/
(
8.4303
H
+
0.8779
)
>
1
is
satisfied
.
13 . An outdoor unit of an air-conditioning apparatus comprising the heat exchanger of claim 1 .
14 . An air-conditioning apparatus comprising:
the outdoor unit of the air-conditioning apparatus of claim 13 ; an indoor unit of an air-conditioning apparatus; and a refrigerant circuit that is constituted by the outdoor unit of the air-conditioning apparatus and the indoor unit of the air-conditioning apparatus and through which refrigerant circulates.
15 . The air-conditioning apparatus of claim 14 , wherein the outdoor unit of the air-conditioning apparatus includes a plurality of the heat exchangers,
the air-conditioning apparatus further comprising a controller configured so that during a defrosting operation, a flow of the refrigerant through one or more of the plurality of heat exchangers is in series with a flow of the refrigerant through an other of the heat exchangers and configured so that when the heat exchangers function as evaporators, a flow of the refrigerant through each of the heat exchangers is in parallel with a flow of the refrigerant through an other of the heat exchangers.
16 . The air-conditioning apparatus of claim 15 , wherein
the controller is configured so that during a defrosting operation, a flow of the refrigerant through one or more of the plurality of heat exchangers is in series with a flow of the refrigerant through an other of the heat exchangers and configured so that a flow of the refrigerant through rest of the heat exchangers is in parallel with the flow of the refrigerant through the other of the heat exchangers, and in a case in which there are a plurality of the heat exchangers configured so that during a defrosting operation, flows of the refrigerant through the heat exchangers are in parallel with one another, the refrigerant is stopped from flowing through at least one of the heat exchangers and an other of the heat exchangers is preferentially subjected to the defrosting operation.
17 . The air-conditioning apparatus of claim 14 , wherein the refrigerant is a pure refrigerant selected from the group consisting of HFO1123, HFO1132(E), R1234yf, R1234ze(E), R1234ze(Z), R1233zd(E), propane (R290), and fluoroethane (R161).Join the waitlist — get patent alerts
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