U.S. patent application number 17/177452 was filed with the patent office on 2021-08-19 for air conditioner and method for controlling an air conditioner.
The applicant listed for this patent is LG ELECTRONICS INC. Invention is credited to Eunjun CHO, Pilhyun YOON, Hyungyul YUM.
Application Number | 20210254880 17/177452 |
Document ID | / |
Family ID | 1000005450405 |
Filed Date | 2021-08-19 |
United States Patent
Application |
20210254880 |
Kind Code |
A1 |
YUM; Hyungyul ; et
al. |
August 19, 2021 |
AIR CONDITIONER AND METHOD FOR CONTROLLING AN AIR CONDITIONER
Abstract
An air conditioner is provided that may include a defrosting
bypass valve disposed at a defrosting bypass pipe having a first
end connected to a middle point of the outdoor heat exchanger and a
second end connected to an inlet pipe of a compressor, and a
processor configured to open and close the defrosting bypass valve
according to a temperature of a refrigerant in an outdoor heat
exchanger. At a beginning of a defrosting operation, the processor
may open the defrosting bypass valve to bypass a portion of the
refrigerant in the outdoor heat exchanger to the inlet pipe of the
compressor, and if the temperature of the refrigerant in the
outdoor heat exchanger exceeds a predetermined temperature, the
processor may close the defrosting bypass valve, thereby achieving
defrosting performance at an early stage of the defrosting
operation.
Inventors: |
YUM; Hyungyul; (Seoul,
KR) ; CHO; Eunjun; (Seoul, KR) ; YOON;
Pilhyun; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LG ELECTRONICS INC |
Seoul |
|
KR |
|
|
Family ID: |
1000005450405 |
Appl. No.: |
17/177452 |
Filed: |
February 17, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F25B 13/00 20130101;
F25D 21/002 20130101; F25B 41/42 20210101 |
International
Class: |
F25D 21/00 20060101
F25D021/00; F25B 13/00 20060101 F25B013/00; F25B 41/42 20060101
F25B041/42 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 17, 2020 |
KR |
10-2020-0019272 |
Claims
1. An air conditioner, comprising: a compressor configured to
compress a refrigerant; an indoor heat exchanger in fluid
communication with the compressor, and configured to perform heat
exchange between the refrigerant and indoor air; an outdoor heat
exchanger in fluid communication with the compressor, and
configured to perform heat exchange between the refrigerant and
outside air; an expansion device disposed in a pipe that connects
the indoor heat exchanger and the outdoor heat exchanger and
configured to expand the refrigerant; a defrosting bypass pipe
having a first end connected at a middle point of the outdoor heat
exchanger, and a second end connected to an inlet pipe of the
compressor; a defrosting bypass valve disposed in the defrosting
bypass pipe; and a processor configured to open and close the
defrosting bypass valve according to a temperature of the
refrigerant in the outdoor heat exchanger.
2. The air conditioner of claim 1, wherein the outdoor heat
exchanger comprises: a first row in which a tube connected to a
pipe connected to the compressor is disposed; a third row in which
a tube connected to a pipe connected to the expansion device is
disposed; and a second row, which is disposed between the first row
and the third row and in which a tube connecting the tube in the
first row and the tube in the third row is disposed, wherein the
defrosting bypass pipe is connected to the tube disposed in the
second row.
3. The air conditioner of claim 2, wherein in the outdoor heat
exchanger, a flow direction of the refrigerant in the first row is
opposite to a flow direction of the refrigerant in the second
row.
4. The air conditioner of claim 2, wherein in the outdoor heat
exchanger, a lower end of the second row communicates with the
first row, and an upper end of the second row communicates with the
third row.
5. The air conditioner of claim 1, wherein in response to the
temperature of the refrigerant in the outdoor heat exchanger being
lower than a predetermined temperature, the processor opens the
defrosting bypass valve, and in response to the temperature of the
refrigerant in the outdoor heat exchanger being higher than or
equal to the predetermined temperature, the processor closes the
defrosting bypass valve.
6. The air conditioner of claim 1, further comprising an
accumulator disposed between the outdoor heat exchanger and the
compressor, wherein the defrosting bypass pipe comprises: a common
bypass pipe connected to the outdoor heat exchanger; a first bypass
pipe branched from the common bypass pipe and connected to the
inlet pipe of the compressor; and a second bypass pipe branched
from the common bypass pipe and connected to an inlet pipe of the
accumulator.
7. The air conditioner of claim 6, wherein the defrosting bypass
valve comprises: a first bypass valve disposed in the first bypass
pipe; and a second bypass valve disposed in the second bypass
pipe.
8. The air conditioner of claim 7, wherein based on the temperature
of the refrigerant in the outdoor heat exchanger, the processor
selectively opens and closes the first bypass valve or the second
bypass valve.
9. The air conditioner of claim 7, wherein in response to the
temperature of the refrigerant in the outdoor heat exchanger being
lower than a predetermined reference temperature, the processor
opens the second bypass valve, and in response to the temperature
of the refrigerant in the outdoor heat exchanger being higher than
or equal to the predetermined reference temperature, the processor
closes the second bypass valve.
10. A method for controlling an air conditioner comprising a
compressor, an outdoor heat exchanger, an expansion device, and an
indoor heat exchanger, the method comprising: performing a
high-speed defrosting operation of opening a defrosting bypass
valve disposed at a defrosting bypass pipe having a first end
connected to a middle point of the outdoor heat exchanger, and a
second end connected to an inlet pipe of the compressor; and in
response to a temperature of a refrigerant in the outdoor heat
exchanger being higher than or equal to a predetermined
temperature, performing a normal defrosting operation of closing
the defrosting bypass valve.
11. The method of claim 10, wherein the defrosting bypass pipe
comprises: a common bypass pipe connected to the outdoor heat
exchanger; a first bypass pipe including a first bypass valve,
branched from the common bypass pipe, and connected to the inlet
pipe of the compressor; and a second bypass pipe including a second
bypass valve, branched from the common bypass pipe, and connected
to an inlet pipe of an accumulator, wherein the performing of the
high-speed defrosting operation comprises selectively opening and
closing the first bypass valve or the second bypass valve according
to the temperature of the refrigerant in the outdoor heat
exchanger.
12. The method of claim 11, wherein the performing of the
high-speed defrosting operation comprises, in response to the
temperature of the refrigerant in the outdoor heat exchanger being
lower than the predetermined reference temperature, opening the
second bypass valve, and in response to the temperature of the
refrigerant in the outdoor heat exchanger being higher than or
equal to the predetermined reference temperature, closing the
second bypass valve.
13. An air conditioner, comprising: a compressor configured to
compress a refrigerant; an indoor heat exchanger in fluid
communication with the compressor and configured to perform heat
exchange between the refrigerant and indoor air; an outdoor heat
exchanger in fluid communication with the compressor and configured
to perform heat exchange between the refrigerant and outside air;
an expansion valve disposed in a pipe that connects the indoor heat
exchanger and the outdoor heat exchanger, and configured to expand
the refrigerant; a defrosting bypass pipe having a first end
connected to a middle point of the outdoor heat exchanger, and a
second end connected to an inlet pipe of the compressor; and a
defrosting bypass valve disposed at the defrosting bypass pipe.
14. The air conditioner of claim 13, wherein the outdoor heat
exchanger comprises: a first row in which a tube connected to a
pipe connected to the compressor is disposed; a third row in which
a tube connected to a pipe connected to the expansion device is
disposed; and a second row, which is disposed between the first row
and the third row and in which a tube connecting the tube in the
first row and the tube in the third row is disposed, wherein the
defrosting bypass pipe is connected to the tube disposed in the
second row.
15. The air conditioner of claim 14, wherein in the outdoor heat
exchanger, a flow direction of the refrigerant in the first row is
opposite to a flow direction of the refrigerant in the second
row.
16. The air conditioner of claim 14, wherein in the outdoor heat
exchanger, a lower end of the second row communicates with the
first row, and an upper end of the second row communicates with the
third row.
17. The air conditioner of claim 13, further comprising an
accumulator disposed between the outdoor heat exchanger and the
compressor, wherein the defrosting bypass pipe comprises: a common
bypass pipe connected to the outdoor heat exchanger; a first bypass
pipe branched from the common bypass pipe and connected to the
inlet pipe of the compressor; and a second bypass pipe branched
from the common bypass pipe and connected to an inlet pipe of the
accumulator.
18. The air conditioner of claim 17, wherein the defrosting bypass
valve comprises: a first bypass valve disposed in the first bypass
pipe; and a second bypass valve disposed in the second bypass pipe.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application claims priority under 35 U.S.C. .sctn. 119
to Korean Application No. 10-2020-0019272 filed on Feb. 17, 2020,
whose entire disclosure is hereby incorporated by reference.
BACKGROUND
1. Field
[0002] An air conditioner and a method for controlling an air
conditioner are disclosed herein.
2. Background
[0003] Generally, an air conditioner is a device for cooling or
heating indoor air by using a refrigeration cycle apparatus
including a compressor, an outdoor heat exchanger, an expansion
device, and an indoor heat exchanger. In the case of cooling the
indoor air, the outdoor heat exchanger functions as a condenser,
and the indoor heat exchanger functions as an evaporator, in which
the refrigerant sequentially circulates through the compressor, the
outdoor heat exchanger, the expansion device, the indoor heat
exchanger, and the compressor. In the case of heating the indoor
air, the outdoor heat exchanger functions as an evaporator, and the
indoor heat exchanger functions as a condenser, in which the
refrigerant sequentially circulates through the compressor, the
indoor heat exchanger, the expansion device, the outdoor heat
exchanger, and the compressor.
[0004] In the case of heating the indoor air, a defrosting
operation may be performed if necessary. For heating the indoor
air, a refrigerant having a lower temperature than the outside air
flows through the outdoor heat exchanger, and absorbs heat from the
outside air. In this process, moisture contained in the outside air
may be condense on a surface of the outdoor heat exchanger, and in
a cold place, the moisture may be frozen on the surface of the
outdoor heat exchanger. When the surface of the outdoor heat
exchanger is frozen, a problem occurs in that heat exchange does
not take place properly, thereby reducing heating efficiency.
Accordingly, if necessary, it is required to perform a defrosting
operation to remove the ice.
[0005] Generally, during the defrosting operation, the refrigerant
circulates in a reverse direction to a direction of a heating
operation, and circulates in a similar direction to a circulation
direction of the refrigerant during a cooling operation. However,
the temperature of the refrigerant during the defrosting operation
is always lower than the temperature of the refrigerant during the
cooling operation, and the refrigerant flowing through an inlet
pipe of the compressor has a very low temperature and a very low
pressure. Accordingly, a rotational speed (Hz) of the compressor is
inevitably reduced, thereby resulting in poor defrosting
performance.
[0006] More particularly, in commonly used air conditioners,
various components are provided at a refrigerant passage to perform
various operation modes. However, such air conditioners have a
problem in that pressure loss increases as the refrigerant passes
through the components. In addition, a combined cooling/heating air
conditioner has a problem in that a refrigerant pipe installed at
an outlet end of an outdoor heat exchanger is designed to have a
small diameter to secure cooling performance, thereby increasing
pressure loss and reducing defrosting performance.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Embodiments will be described in detail with reference to
the following drawings in which like reference numerals refer to
like elements, and wherein:
[0008] FIG. 1 is a schematic diagram illustrating an air
conditioner during a heating operation according to an
embodiment;
[0009] FIG. 1A is a control block diagram of the air conditioner of
FIG. 1;
[0010] FIG. 2 is a schematic diagram illustrating the air
conditioner of FIG. 1 during a cooling operation;
[0011] FIG. 3 is a schematic diagram illustrating the air
conditioner of FIG. 1 during a defrosting operation;
[0012] FIG. 4 is a flow chart of a method for controlling an air
conditioner according to an embodiment;
[0013] FIG. 5 is a schematic diagram illustrating an air
conditioner during a defrosting operation according to another
embodiment;
[0014] FIG. 5A is a control block diagram of the air conditioner of
FIG. 5; and
[0015] FIG. 6 is a flow chart of a method for controlling an air
conditioner according to another embodiment.
DETAILED DESCRIPTION
[0016] Advantages and features of embodiments and methods for
accomplishing the same will be more clearly understood from
embodiments described hereinafter with reference to the
accompanying drawings. However, the embodiments are not limited to
the disclosed embodiments but may be implemented in various
different forms. The embodiments are provided only to complete
disclosure and to fully provide a person having ordinary skill in
the art to which the embodiments pertains with the category, and
embodiments will be defined by the scope of the appended claims.
Wherever possible, the same or like reference numbers have been
used throughout the drawings to refer to the same or like
components.
[0017] Reference will now be made to embodiments, examples of which
are illustrated in the accompanying drawings.
[0018] FIG. 1 is a schematic diagram of an air conditioner
according to an embodiment. FIG. 1A is a control block diagram of
the air conditioner of FIG. 1.
[0019] Referring to FIG. 1, the air conditioner according to an
embodiment may include a compressor 1, an outdoor heat exchanger 2,
an expansion device (valve) 3, and an indoor heat exchanger 4. The
compressor 1, the outdoor heat exchanger 2, the expansion device 3,
and the indoor heat exchanger 4 may be connected by refrigerant
pipes.
[0020] The compressor 1, the outdoor heat exchanger 2, and the
expansion device 3 may form an outdoor unit. The outdoor unit may
include an outdoor blower (fan) (not shown) that blows air to the
outdoor heat exchanger 2. By rotation of the outdoor blower,
outside air may be introduced into the outdoor unit, heat exchanged
with the outdoor heat exchanger 2, and then discharged to the
outside.
[0021] The indoor heat exchanger 4 may be included in an indoor
unit. The indoor unit may further an indoor blower (fan) (not
shown) that blows air to the indoor heat exchanger 4. By rotation
of the indoor blower, indoor air may be introduced into the indoor
unit, heat exchanged with the indoor heat exchanger 4, and then
discharged indoors.
[0022] During a cooling operation of the air conditioner, the
outdoor heat exchanger 2 may function as a condenser, and the
indoor heat exchanger 4 may function as an evaporator. During the
cooling operation of the air conditioner, the refrigerant may
sequentially circulate through the compressor 1, the outdoor heat
exchanger 2, the expansion device 3, the indoor heat exchanger 4,
and the compressor 1.
[0023] During a heating operation of the air conditioner, the
outdoor heat exchanger 2 may function as an evaporator, and the
indoor heat exchanger 4 may function as a condenser. During the
heating operation of the air conditioner, the refrigerant may
sequentially circulate through the compressor 1, the indoor heat
exchanger 4, the expansion device 3, the outdoor heat exchanger 2,
and the compressor 1.
[0024] The compressor 1 may compress the refrigerant. The condenser
may condense the refrigerant having passed through the compressor
1. The expansion device 3 may expand the refrigerant having passed
through the condenser. The evaporator may evaporate the refrigerant
having passed through the expansion device 3.
[0025] The air conditioner may be an air conditioner capable of
both the cooling operation and the heating operation. However, the
air conditioner may also be provided as an air conditioner capable
of only the heating operation.
[0026] The following description will be given using an example in
which the air conditioner is capable of both the cooling operation
and the heating operation.
[0027] The air conditioner according to an embodiment may further
include a cooling/heating switching valve 7. The cooling/heating
switching valve 7 may be included in the outdoor unit. The
cooling/heating switching valve 7 may switch a flow direction of
the refrigerant, discharged from the compressor 1, to either the
outdoor heat exchanger 2 or the indoor heat exchanger 4.
[0028] Compressor intake passages 81, 8, and 85 may connect an
outlet of the outdoor heat exchanger 2 during the heating operation
and an inlet of the compressor 1. The compressor intake passages
81, 8, and 85 may include an accumulator 8 that separates liquid
refrigerant from gaseous refrigerant; first refrigerant pipe 81
that connects an outlet of the outdoor heat exchanger 2 during the
heating operation and an inlet of the accumulator 8; and compressor
inlet pipe 85 that connects an outlet of the accumulator 8 and the
inlet of the compressor 1.
[0029] During the heating operation of the air conditioner, the
liquid refrigerant and the gaseous refrigerant may flow to the
accumulator 8 from the outdoor heat exchanger 2 through the first
refrigerant pipe 81, and the refrigerant, flowing to the
accumulator 8, may be separated into the liquid refrigerant and the
gaseous refrigerant. The liquid refrigerant, separated at the
accumulator 8, may be accommodated in a lower portion of the
accumulator 8, and the gaseous refrigerant separated at the
accumulator 8 may be accommodated above the separated liquid
refrigerant. The gaseous refrigerant, separated at the accumulator
8, may flow into the compressor 1 through the compressor inlet pipe
85, and the liquid refrigerant separated at the accumulator 8, may
remain in the accumulator 8.
[0030] A second refrigerant pipe 82 may connect an outlet of the
indoor heat exchanger 82 during the heating operation and an inlet
of the expansion device 3 during the heating operation. A third
refrigerant pipe 83 may connect an outlet of the expansion device 3
during the heating operation and the inlet of the outdoor heat
exchanger 2 during the heating operation. A fourth refrigerant pipe
84 may connect the outlet of the compressor 1 and the inlet of the
indoor heat exchanger 4 during the heating operation.
[0031] The cooling/heating switching valve 7 may be installed at or
in the first refrigerant pipe 81 and the fourth refrigerant pipe
84.
[0032] The outdoor heat exchanger 2 may be a fin-tube type heat
exchanger. The outdoor heat exchanger 2 may include with a
plurality of fins arranged one above the other, and tubes passing
through the plurality of fins several times. A refrigerant passage,
through which the refrigerant circulates, may be formed in the
tubes.
[0033] Referring to FIG. 1, the outdoor heat exchanger 2 may
include a refrigerant passage divided into a plurality of unit
passages. In this embodiment, the refrigerant passage is divided
into three unit passages; however, embodiments are not limited
thereto, and may also be divided into four or more or two or less
unit passages. In this embodiment, the refrigerant passage of the
outdoor heat exchanger 2 is divided into upper, middle, and lower
passages.
[0034] Referring to FIG. 1, the refrigerant passage of the outdoor
heat exchanger 2 may include a plurality of rows on a side portion
thereof. In this embodiment, three rows are formed; however,
embodiments are not limited thereto, and three or more rows may be
formed, as is known to those skilled in the art.
[0035] The outdoor heat exchanger 2 may include first row 21
connected to the first refrigerant pipe 81 connected to the
compressor 1. The outdoor heat exchanger 2 may include a third row
23 connected to the third refrigerant pipe 83 connected to the
expansion device 3. The outdoor heat exchanger 2 may include second
row 22 disposed between the first row 21 and the third row 23.
[0036] A tube disposed in the first row 21 has one or a first side
connected to the first refrigerant pipe 81 connected to the
compressor 1, and the other or a second side connected to a tube
disposed in the second row 22. A tube disposed in the second row 22
has one or a first side connected to the tube in the first row 21,
and the other or a second side connected to a tube in the third row
23. The tube disposed in the third row 23 has one or a first side
connected to the tube in the second row 22, and the other or a
second side connected to the second refrigerant pipe 82 connected
to the expansion device 3.
[0037] The first refrigerant pipe 81 may be connected to the tube
disposed at an upper side of the first row 21. In the first row 21,
the refrigerant may flow from an upper side to a lower side. The
tube in the second row 22 and the tube in the first row 21 may
communicate with each other at a lower end. In the second row 22,
the refrigerant may flow from the lower side to the upper side. The
tube in the third row 23 and the tube in the second row 22 may
communicate with each other at an upper end. In the third row 23,
the refrigerant may flow from the upper side to the lower side. The
third refrigerant pipe 83 may be connected to the tube disposed at
a lower side of the third row 23.
[0038] A flow direction of the refrigerant in the first row 21 may
be opposite to a flow direction of the refrigerant in the second
row 22. The flow direction of the refrigerant in the second row 22
may be opposite to a flow direction of the refrigerant in the third
row 23. For example, if a flow direction of the refrigerant in the
first row 21 is a downward direction, a flow direction of the
refrigerant in the second row 22 may be an upward direction, and a
flow direction of the refrigerant in the third row 23 may be a
downward direction.
[0039] At least one or more temperature sensors may be disposed in
the outdoor heat exchanger 2. Referring to FIG. 1, the outdoor heat
exchanger 2 may include a first outdoor heat exchanger temperature
sensor 221 and a second outdoor heat exchanger temperature sensor
231. In embodiments disclosed herein, a temperature THEX of the
outdoor heat exchanger 2, which is controlled by a processor 300,
may be a temperature measured by the first outdoor heat exchanger
temperature sensor 221.
[0040] The first outdoor heat exchanger temperature sensor 221 may
be disposed in the second row 22. The first outdoor heat exchanger
temperature sensor 221 may be disposed in the outdoor heat
exchanger 2 at a position adjacent to a defrosting bypass pipe 86.
According to another embodiment which will be described with
respect to FIG. 5, the first outdoor heat exchanger temperature
sensor 221 may be disposed in the outdoor heat exchanger 2 at a
position adjacent to a common bypass pipe 86c. The first outdoor
heat exchanger temperature sensor 221 may be disposed at a
connection point between the common bypass pipe 86c and the outdoor
heat exchanger 2.
[0041] The first outdoor heat exchanger temperature sensor 221 may
measure a temperature of the refrigerant bypassed from the outdoor
heat exchanger 2 to the defrosting bypass pipe 86, and may transmit
the measured data to processor 300. The second outdoor heat
exchanger temperature sensor 231 may be disposed in the third row
23. The second outdoor heat exchanger temperature sensor 231 may be
disposed in the outdoor heat exchanger 2 at a position adjacent to
the third refrigerant pipe 83. The second outdoor heat exchanger
temperature sensor 231 may be disposed at a connection point
between the third refrigerant pipe 83 and the outdoor heat
exchanger 2. The second outdoor heat exchanger temperature sensor
231 may measure a temperature of the refrigerant discharged from
the outdoor heat exchanger 2 to the third refrigerant pipe 83, and
may transmit the measured data to the processor 300.
[0042] Although not illustrated herein, when the refrigerant
passage of the outdoor heat exchanger 2 is divided into upper,
middle, and lower passages as illustrated in FIG. 1, the first
temperature sensor 221 and the second temperature sensor 231 may be
disposed at a position corresponding to the middle refrigerant
passage and may be disposed at a position corresponding to the
lower refrigerant passage.
[0043] The defrosting bypass pipe 86 has one or a first end
connected to the outdoor heat exchanger 2 and the other or a second
end connected to the inlet pipe 85 of the compressor 1. The
defrosting bypass pipe 86 is a device for bypassing a portion of
the refrigerant, flowing through the outdoor heat exchanger 2, to
the compressor 1.
[0044] The first end of the defrosting bypass pipe 86 may be
connected to the outdoor heat exchanger 2, and the refrigerant may
flow therethrough. The defrosting bypass pipe 86 may be connected
to the tube in the second row 22 of the outdoor heat exchanger 2.
When the refrigerant passage of the outdoor heat exchanger 2 is
divided into upper, middle, and lower passages as illustrated in
FIG. 1, the defrosting bypass pipe 86 may be connected in parallel
to each of the upper, middle, and lower passages.
[0045] The defrosting bypass pipe 86 may be connected to a middle
of the tube in the second row 22 of the outdoor heat exchanger 2.
The defrosting bypass pipe 86 may be connected at a center of the
tube of the second row 22, but as illustrated in FIG. 1, the
defrosting bypass pipe 86 may be connected at a position as close
to the center of the tube of the second row 22 as possible.
[0046] The second end of the defrosting bypass pipe 86 may be
connected to the inlet pipe 85 of the compressor 1. The defrosting
bypass pipe 86 may be connected to the inlet pipe 85 of the
compressor 1 to allow the bypassed refrigerant to flow into the
compressor 1.
[0047] The defrosting bypass pipe 86 has effects in that by
bypassing a portion of the refrigerant to the compressor 1, it is
possible to prevent pressure of the refrigerant flowing into the
compressor 1 from dropping to a level lower than a threshold, and
by increasing a temperature of the refrigerant flowing into the
compressor 1 to a sufficient level, defrosting performance may be
improved.
[0048] A defrosting bypass valve 87 may be disposed at or in the
defrosting bypass pipe 86 and is a device for opening and closing
the defrosting bypass pipe 86. The defrosting bypass valve 87 may
open the defrosting bypass pipe 86 during the heating operation of
the air conditioner, and may close the defrosting bypass pipe 86
during the cooling operation hereof. The defrosting bypass valve 87
may be an opening/closing valve, and may control an amount of the
refrigerant flowing through the defrosting bypass pipe 86.
[0049] The processor 300 is a device for controlling operation of
the air conditioner. The processor 300 may be disposed in the air
conditioner.
[0050] The processor 300 may perform controlling operations, such
as controlling operation of the compressor 1, controlling opening
and closing of the expansion device 3, and controlling opening and
closing of an air outlet of the air conditioner or changing a
discharge angle thereof, for example. Further, in addition to the
controlling operations, the processor 300 may perform a control
method which may be easily adopted by those skilled in the art.
[0051] The processor 300 may control the defrosting bypass valve
87. By opening or closing the defrosting bypass valve 87 disposed
at or in the defrosting bypass pipe 86, the processor 300 may
bypass the refrigerant to the inlet pipe 85 of the compressor 1. By
opening the defrosting bypass valve 87 for a predetermined period
of time, the processor 300 may bypass the refrigerant to the inlet
pipe 85 of the compressor 1, and after the predetermined period of
time has elapsed, the processor 300 may close the defrosting bypass
valve 87 so as not to bypass the refrigerant.
[0052] The predetermined period of time is a time corresponding to
a pressure of the refrigerant introduced into the compressor 1, at
which the refrigerant is sufficient to maintain defrosting
performance. During the predetermined period of time, the processor
300 may open the defrosting bypass valve 87 and bypass the
refrigerant to compensate for the pressure of the refrigerant
introduced into the compressor 1. After the predetermined period of
time has elapsed, the processor 300 may close the defrosting bypass
valve 87 so as not to bypass the refrigerant. The processor 300 may
calculate the predetermined period of time according to a
temperature of the outdoor heat exchanger 2.
[0053] If the temperature of the refrigerant in the outdoor heat
exchanger 2 is less than a predetermined reference temperature, the
processor 300 may open the defrosting bypass valve 87, and if the
temperature of the refrigerant in the outdoor heat exchanger 2 is
higher than or equal to the predetermined reference temperature,
the processor 30 may close the defrosting bypass valve 87. The
reference temperature may be stored in the processor 300, and may
be determined through experiment. The reference temperature is a
temperature of the refrigerant in the outdoor heat exchanger 2,
which corresponds to the pressure of the refrigerant at which the
refrigerant introduced into the compressor 1 is sufficient to
achieve defrosting performance although the refrigerant is not
bypassed. That is, if the temperature of the refrigerant passing
through the outdoor heat exchanger 2, is higher than or equal to
the reference temperature, even when the refrigerant is not
bypassed to the inlet pipe 85 of the compressor 1, the refrigerant
introduced into the compressor 1 has a sufficiently high pressure
to achieve required defrosting performance.
[0054] For example, upon starting a high-speed defrosting
operation, the processor 300 may close the defrosting bypass valve
87 when the temperature of the refrigerant, bypassed from the
outdoor heat exchanger 2, reaches 12.degree. C. When the
temperature of the refrigerant is 12.degree. C., a pressure of the
refrigerant introduced into the compressor 1 is sufficient to
achieve defrosting performance even when the refrigerant is not
bypassed.
[0055] The following description will be given of a flow of
refrigerant during the heating operation of the air conditioner.
The refrigerant, compressed by the compressor 1, flows to the
cooling/heating switching valve 7 through a first portion of the
fourth refrigerant pipe 84. The refrigerant, flowing to the
cooling/heating switching valve 7, flows to the indoor heat
exchanger 4 through a second portion of the fourth refrigerant pipe
84. After flowing to the indoor heat exchanger 4, the refrigerant
flows to the expansion device 3 through the second refrigerant pipe
82. The refrigerant flowing to the expansion device 3 flows to the
outdoor heat exchanger 2 through the third refrigerant pipe 83.
After flowing to the outdoor heat exchanger 2, the refrigerant
flows to the cooling/heating switching valve 7 through a first
portion of the first refrigerant pipe 81. After flowing to the
cooling/heating switching valve 7, the refrigerant flows to the
accumulator 8 through a second portion of the first refrigerant
pipe 81. After flowing to the accumulator 8, the refrigerant flows
to the compressor 1 through the compressor inlet pipe 85. During
the heating operation of the air conditioner, the flow of the
refrigerant is repeated in this manner.
[0056] The following description will be given of a flow of
refrigerant during a cooling operation of the air conditioner. The
refrigerant, compressed by the compressor 1, flows to the
cooling/heating switching valve 7 through a first portion of the
fourth refrigerant pipe 84. After flowing to the cooling/heating
switching valve 7, the refrigerant flows to the outdoor heat
exchanger 2 through the first portion of the first refrigerant pipe
81. After flowing the outdoor heat exchanger 2, the refrigerant
flows to the expansion device 3 through the second refrigerant pipe
82. After flowing to the expansion device 3, the refrigerant flows
to the indoor heat exchanger 4 through the second refrigerant pipe
82. After flowing to the indoor heat exchanger 4, the refrigerant
flows to the cooling/heating switching valve 7 through a second
portion of the fourth refrigerant pipe 84. After flowing to the
cooling/heating switching valve 7, the refrigerant flows to the
accumulator 8 through the second portion of the first refrigerant
pipe 81. After flowing to the accumulator 8, the refrigerant flows
to the compressor 1 through the compressor inlet pipe 85. During
the cooling operation of the air conditioner, the flow of
refrigerant is repeated in this manner.
[0057] The following description will be given of a flow of a
refrigerant during a normal defrosting operation of the air
conditioner. The refrigerant, compressed by the compressor 1, flows
to the cooling/heating switching valve 7 through the first portion
of the fourth refrigerant pipe 84. After flowing to the
cooling/heating switching valve 7, the refrigerant flows to the
outdoor heat exchanger 2 through the first portion of the first
refrigerant pipe 81, and removes moisture or ice formed on the
outdoor heat exchanger 2. After flowing to the outdoor heat
exchanger 2, the refrigerant flows to the expansion device 3
through the second refrigerant pipe 82. After flowing to the
expansion device 3, the refrigerant flows to the indoor heat
exchanger 4 through the second refrigerant pipe 82. After flowing
to the indoor heat exchanger 4, the refrigerant flows to the
cooling/heating switching valve 7 through a second portion of the
fourth refrigerant pipe 84. After flowing to the cooling/heating
switching valve 7, the refrigerant flows to the accumulator 8
through the second portion of the first refrigerant pipe 81. After
flowing to the accumulator 8, the refrigerant flows to the
compressor 1 through the compressor inlet pipe 85. During the
normal defrosting operation of the air conditioner, the flow of
refrigerant is repeated in this manner.
[0058] In the normal defrosting operation of the air conditioner, a
high-speed defrosting operation may be partially included. A time
for the high-speed defrosting operation is controlled by the
processor 300. When starting the normal defrosting operation, the
processor 300 may include some of the high-speed defrosting
operation. Upon starting the normal defrosting operation, the
processor 300 may start the high-speed defrosting operation, and
after a predetermined period of time has elapsed, the processor 300
may terminate the high-speed defrosting operation and may start the
normal defrosting operation.
[0059] The following description will be given of a flow of the
refrigerant during the high-speed defrosting operation of the air
conditioner. The refrigerant, compressed by the compressor 1, flows
to the cooling/heating switching valve 7 through the first portion
of the fourth refrigerant pipe 84. After flowing to the
cooling/heating switching valve 7, the refrigerant flows to the
outdoor heat exchanger 2 through the first portion of the first
refrigerant pipe 81. A portion of the refrigerant flowing to the
outdoor heat exchanger 2 flows through the bypass pipe 86 connected
to the second row 22, and the remaining refrigerant passes through
the third row 23 to flow through the second refrigerant pipe
82.
[0060] The portion of the refrigerant flowing through the bypass
pipe 86 is joined with the remaining refrigerant at the inlet pipe
85 of the compressor 1 to flow into the compressor 1. The remaining
refrigerant flows into the compressor 1 by passing through the
expansion device 3 in the same manner as the normal defrosting
operation, and is joined with the portion of the refrigerant at the
inlet pipe 85 of the compressor 1. During the high-speed defrosting
operation of the air conditioner, the flow of the refrigerant is
repeated in this manner.
[0061] In the high-speed defrosting operation, a portion of the
refrigerant is branched while flowing through the outdoor heat
exchanger 2, to be bypassed to the inlet pipe 85 of the compressor
1. A pressure of the remaining refrigerant drops while the
refrigerant passes through the expansion device 3, and while the
refrigerant passes through other components, pressure loss
increases such that the pressure of the refrigerant flowing into
the compressor 1 further drops. Accordingly, the pressure of the
refrigerant at the inlet pipe 85 of the compressor 1 is too low to
provide proper defrosting performance. In this case, the bypassed
portion of the refrigerant is joined to compensate for the pressure
drop, thereby producing an effect of providing defrosting
performance of the air conditioner.
[0062] Further, in order to achieve defrosting performance, the
third refrigerant pipe 83, connected to an outlet end of the
outdoor heat exchanger 2, is required to have a sufficiently large
diameter, but if the third refrigerant pipe 83 is large, there is a
problem in that cooling performance is greatly reduced.
Accordingly, by performing the high-speed defrosting operation
before the normal defrosting operation, defrosting performance may
be provided at an early stage of the defrosting operation even when
the third refrigerant pipe 83 has a sufficiently small diameter,
and cooling performance may also be maintained.
[0063] In this case, however, only a portion of the refrigerant
flows in the outdoor heat exchanger 2 but the remaining refrigerant
does not flow therein, such that a problem occurs in that normal
operation performance is reduced. Further, in the outdoor heat
exchanger 2, a portion of the refrigerant does not flow through the
tube of the third row 23 and a portion of the tube of the second
row 22, such that defrosting may not be performed properly.
Accordingly, by terminating the high-speed defrosting operation at
a proper time and switching the defrosting operation to the normal
defrosting operation, the processor 300 may provide general
defrosting operation performance. The proper time may be a time
when the temperature of the heat exchanger is higher than or equal
to a reference temperature, and may be a time when the pressure of
the refrigerant at the inlet pipe 85 of the compressor 1 is
sufficient to properly provide defrosting performance.
[0064] FIG. 5 is a diagram illustrating an air conditioner
according to another embodiment. FIG. 5A is a control block diagram
of the air conditioner of FIG. 5. In this embodiment, the same
components as those of the previous embodiment will be denoted by
the same or like reference numerals and description thereof has
been omitted, and the following description will be focused on
different points.
[0065] Referring to FIG. 5, the defrosting bypass pipe 86 may be
connected to the middle of the outdoor heat exchanger 2. More
specifically, the common bypass pipe 86c of the defrosting bypass
pipe 86 may be connected to the middle of the outdoor heat
exchanger 2. One or a first end of the common bypass pipe 86c may
be branched into at least two pipes and the branched pipes may be
referred to as a "first bypass pipe 86a" and a "second bypass pipe
86b".
[0066] The first bypass pipe 86a may be branched from the common
bypass pipe 86c, and may be connected to the inlet pipe 85 of the
compressor 1. That is, the first bypass pipe 86a may be connected
to the inlet pipe 85 of the compressor 1 as in the previous
embodiment. A first bypass valve 87a may be disposed on or in the
first bypass pipe 86a.
[0067] The second bypass pipe 86b may be branched from the common
bypass pipe 86c, and may be connected to an inlet pipe of the
accumulator 8. A portion of the refrigerant branched from the
common bypass pipe 86c may pass through the second bypass pipe 86b
to flow into the inlet pipe of the accumulator 8.
[0068] After passing through the second bypass pipe 86b, the
portion of the refrigerant may flow into the accumulator 8 to be
separated into liquid refrigerant and gaseous refrigerant. The
gaseous refrigerant separated at the accumulator 8 may flow into
the compressor 1 through the inlet pipe of the compressor 1, and
the liquid refrigerant separated at the accumulator 8 may remain in
the accumulator 8.
[0069] During the normal defrosting operation of the air
conditioner, the processor 300 may perform a portion of the
high-speed defrosting operation, which is similar to the control
method of the previous embodiment. However, unlike the previous
embodiment, the processor 300 may selectively open and close the
first bypass valve 87a and the second bypass valve 87b.
[0070] More specifically, in this embodiment, unlike the previous
embodiment, if the temperature of the refrigerant in the outdoor
heat exchanger 2 is lower than a predetermined reference
temperature, the processor 300 may open the second bypass valve
87b, and if the temperature of the refrigerant is higher than or
equal to the predetermined reference temperature, the processor 300
may close the second bypass valve 87b.
[0071] By opening the second bypass valve 87b, the processor 300
may guide the bypassed refrigerant to the inlet pipe of the
accumulator 8. The refrigerant bypassed to the inlet pipe of the
accumulator 8 may be mixed with the refrigerant having passed
through the indoor heat exchanger 4, and may flow into the
accumulator 8. The refrigerant flowing into the accumulator 8 may
be separated into liquid refrigerant and gaseous refrigerant. The
gaseous refrigerant separated at the accumulator 8 may pass through
the compressor inlet pipe to flow into the compressor 1, and the
liquid refrigerant separated at the accumulator 8 may remain in the
accumulator 8.
[0072] As described above, the air conditioner according to the
embodiments disclosed herein have an effect of maintaining
defrosting performance by preventing abnormal pressure drop
occurring at the inlet pipe 85 of the compressor 1 at the early
stage of the defrosting operation when the refrigerant, branched
from the middle of the outdoor heat exchanger 2, is bypassed to the
inlet pipe 85 of the compressor 1. In addition, as a portion of the
refrigerant is bypassed directly to the compressor 1 without
circulating through other components of the air conditioner, the
air conditioner also has an effect of improving defrosting
performance at the early stage of the defrosting operation.
Further, in the air conditioner, by further reducing pressure loss
of the refrigerant flowing to a rear end of the outdoor heat
exchanger 2, the third refrigerant pipe 83 having a relatively
small diameter may be designed to have a much smaller diameter,
thereby producing an effect of improving cooling performance.
[0073] Embodiments disclosed herein provide an air conditioner, in
which defrosting performance may be maintained by increasing
pressure of a refrigerant in a compressor inlet pipe at an early
stage of a defrosting operation. Embodiments disclosed herein
further provide an air conditioner capable of rapidly defrosting
the ice frozen on an outdoor heat exchanger by minimizing pressure
loss caused when the refrigerant flows.
[0074] Advantages of embodiments are not limited to the
aforementioned advantages, and other advantages not described will
be clearly understood by those skilled in the art from the
description.
[0075] Embodiments disclosed herein provide an air conditioner that
may include a compressor configured to compress a refrigerant; an
indoor heat exchanger disposed at a pipe connected to the
compressor, and configured to perform heat exchange between the
refrigerant and indoor air; an outdoor heat exchanger disposed at a
pipe which is connected to the compressor and which is different
from the pipe where the indoor heat exchanger is disposed, and
configured to perform heat exchange between the refrigerant and
outside air; and an expansion device disposed at a pipe connecting
the indoor heat exchanger and the outdoor heat exchanger, and
configured to expand the refrigerant. The air conditioner may also
include a defrosting bypass pipe having one or a first end
connected to a middle point of the outdoor heat exchanger, and the
other or a second end connected to an inlet pipe of the compressor;
a defrosting bypass valve disposed at or in the defrosting bypass
pipe; and a processor configured to open and close the defrosting
bypass valve according to a temperature of the refrigerant flowing
into the compressor through an inlet pipe of the compressor.
[0076] Further, embodiments disclosed herein provide an air
conditioner that may include a compressor configured to compress a
refrigerant; an indoor heat exchanger disposed at a pipe connected
to the compressor, and configured to perform heat exchange between
the refrigerant and indoor air; an outdoor heat exchanger disposed
at a pipe which is connected to the compressor and which is
different from the pipe where the indoor heat exchanger is
disposed, and configured to perform heat exchange between the
refrigerant and outside air; an expansion device disposed at a pipe
connecting the indoor heat exchanger and the outdoor heat
exchanger, and configured to expand the refrigerant. The air
conditioner may also include a defrosting bypass pipe having one or
a first end connected to a middle point of the outdoor heat
exchanger, and the other or a second end connected to an inlet pipe
of the compressor; and a defrosting bypass valve disposed at the
defrosting bypass pipe.
[0077] The outdoor heat exchanger may include a first row in which
a tube connected to the pipe connected to the compressor is
disposed; a third row in which a tube connected to a pipe connected
to the expansion device is disposed; and a second row, which is
disposed between the first row and the third row, and in which a
tube connecting the tube in the first row and the tube in the third
row is disposed. The defrosting bypass pipe may be connected to the
tube disposed in the second row.
[0078] In the outdoor heat exchanger, a flow direction of the
refrigerant in the first row may be opposite to a flow direction of
the refrigerant in the second row. Further, in the outdoor heat
exchanger, a lower end of the second row may communicate with the
first row, and an upper end of the second row may communicate with
the third row.
[0079] In response to the temperature of the refrigerant in the
outdoor heat exchanger being lower than a predetermined
temperature, the processor may open the defrosting bypass valve. In
response to the temperature of the refrigerant in the outdoor heat
exchanger being higher than or equal to the predetermined
temperature, the processor may close the defrosting bypass
valve.
[0080] The air conditioner may further include an accumulator
disposed between the indoor heat exchanger and the compressor. In
this case, the defrosting bypass pipe may include a common bypass
pipe connected to the outdoor heat exchanger; a first bypass pipe
branched from the common bypass pipe and connected to the inlet
pipe of the compressor; and a second bypass pipe branched from the
common bypass pipe and connected to an inlet pipe of the
accumulator. The defrosting bypass valve may include a first bypass
valve disposed on the first bypass pipe, and a second bypass valve
disposed on the second bypass pipe.
[0081] According to the temperature of the refrigerant in the
outdoor heat exchanger, the processor may selectively open and
close the first bypass valve or the second bypass valve. In
response to the temperature of the refrigerant in the outdoor heat
exchanger being lower than the predetermined reference temperature,
the processor may open the second bypass valve, and in response to
the temperature of the refrigerant in the outdoor heat exchanger
being higher than or equal to the predetermined reference
temperature, the processor may close the second bypass valve.
[0082] Embodiments disclosed herein provide a method of controlling
an air conditioner including a compressor, an outdoor heat
exchanger, an expansion device, and an indoor heat exchanger. The
method may include performing a high-speed defrosting operation of
opening a defrosting bypass valve disposed at a defrosting bypass
pipe having one or a first end connected to a middle point of the
outdoor heat exchanger, and the other or a second end connected to
an inlet pipe of the compressor; and in response to the temperature
of a refrigerant in the outdoor heat exchanger being higher than or
equal to a reference temperature, performing a normal defrosting
operation of closing the defrosting bypass valve.
[0083] The defrosting bypass pipe may include a common bypass pipe
connected to the outdoor heat exchanger; a first bypass pipe
branched from the common bypass pipe and connected to the inlet
pipe of the compressor; and a second bypass pipe branched from the
common bypass pipe and connected to an inlet pipe of the
accumulator. The performing of the high-speed defrosting operation
may include selectively opening and closing the first bypass valve
disposed on the first bypass pipe or the second bypass valve
disposed on the second bypass pipe according to the temperature of
the refrigerant in the outdoor heat exchanger.
[0084] The performing of the high-speed defrosting operation may
include, in response to the temperature of the refrigerant in the
outdoor heat exchanger being lower than the predetermined reference
temperature, opening the second bypass valve, and in response to
the temperature of the refrigerant in the outdoor heat exchanger
being higher than or equal to the predetermined reference
temperature, closing the second bypass valve.
[0085] An air conditioner according to embodiments disclosed herein
has at least the following advantages.
[0086] First, a portion of the refrigerant may be branched from the
middle of the outdoor heat exchanger at an early stage of the
defrosting operation and is bypassed to the compressor inlet pipe,
such that pressure of the refrigerant flowing into the compressor
through the compressor inlet pipe at the early stage of the
defrosting operation may be secured, thereby maintaining defrosting
performance.
[0087] Second, a portion of the refrigerant may be branched from
the middle of the outdoor heat exchanger, and is bypassed directly
to the compressor inlet pipe without passing through other
components, such that pressure loss of the refrigerant may be
minimized.
[0088] Third, according to another embodiment, a portion of the
refrigerant, branched from a common bypass valve, may be bypassed
to an inlet pipe of an accumulator, so that a condensed
refrigerant, present in the branched portion of the refrigerant,
may be separated at the accumulator, and only a vaporized
refrigerant may be guided to the compressor, thereby achieving
defrosting performance.
[0089] Advantages of embodiments are not limited to the aforesaid,
and other effects not described herein will be clearly understood
by those skilled in the art from the description of the appended
claims.
[0090] While embodiments have been shown and described with
reference to embodiments thereof, it should be understood that the
embodiments are not limited to the aforementioned specific
embodiments, and various modifications and variations may be made
by those skilled in the art without departing from the scope and
spirit as defined by the appended claims, and the modified
implementations should not be construed independently of the
technical idea or prospect.
[0091] It will be understood that when an element or layer is
referred to as being "on" another element or layer, the element or
layer can be directly on another element or layer or intervening
elements or layers. In contrast, when an element is referred to as
being "directly on" another element or layer, there are no
intervening elements or layers present. As used herein, the term
"and/or" includes any and all combinations of one or more of the
associated listed items.
[0092] It will be understood that, although the terms first,
second, third, etc., may be used herein to describe various
elements, components, regions, layers and/or sections, these
elements, components, regions, layers and/or sections should not be
limited by these terms. These terms are only used to distinguish
one element, component, region, layer or section from another
region, layer or section. Thus, a first element, component, region,
layer or section could be termed a second element, component,
region, layer or section without departing from the teachings of
the present invention.
[0093] Spatially relative terms, such as "lower", "upper" and the
like, may be used herein for ease of description to describe the
relationship of one element or feature to another element(s) or
feature(s) as illustrated in the figures. It will be understood
that the spatially relative terms are intended to encompass
different orientations of the device in use or operation, in
addition to the orientation depicted in the figures. For example,
if the device in the figures is turned over, elements described as
"lower" relative to other elements or features would then be
oriented "upper" relative to the other elements or features. Thus,
the exemplary term "lower" can encompass both an orientation of
above and below. The device may be otherwise oriented (rotated 90
degrees or at other orientations) and the spatially relative
descriptors used herein interpreted accordingly.
[0094] The terminology used herein is for the purpose of describing
particular embodiments only and is not intended to be limiting of
the invention. As used herein, the singular forms "a", "an" and
"the" are intended to include the plural forms as well, unless the
context clearly indicates otherwise. It will be further understood
that the terms "comprises" and/or "comprising," when used in this
specification, specify the presence of stated features, integers,
steps, operations, elements, and/or components, but do not preclude
the presence or addition of one or more other features, integers,
steps, operations, elements, components, and/or groups thereof.
[0095] Embodiments of the disclosure are described herein with
reference to cross-section illustrations that are schematic
illustrations of idealized embodiments (and intermediate
structures) of the disclosure. As such, variations from the shapes
of the illustrations as a result, for example, of manufacturing
techniques and/or tolerances, are to be expected. Thus, embodiments
of the disclosure should not be construed as limited to the
particular shapes of regions illustrated herein but are to include
deviations in shapes that result, for example, from
manufacturing.
[0096] Unless otherwise defined, all terms (including technical and
scientific terms) used herein have the same meaning as commonly
understood by one of ordinary skill in the art to which this
invention belongs. It will be further understood that terms, such
as those defined in commonly used dictionaries, should be
interpreted as having a meaning that is consistent with their
meaning in the context of the relevant art and will not be
interpreted in an idealized or overly formal sense unless expressly
so defined herein.
[0097] Any reference in this specification to "one embodiment," "an
embodiment," "example embodiment," etc., means that a particular
feature, structure, or characteristic described in connection with
the embodiment is included in at least one embodiment. The
appearances of such phrases in various places in the specification
are not necessarily all referring to the same embodiment. Further,
when a particular feature, structure, or characteristic is
described in connection with any embodiment, it is submitted that
it is within the purview of one skilled in the art to effect such
feature, structure, or characteristic in connection with other ones
of the embodiments.
[0098] Although embodiments have been described with reference to a
number of illustrative embodiments thereof, it should be understood
that numerous other modifications and embodiments can be devised by
those skilled in the art that will fall within the spirit and scope
of the principles of this disclosure. More particularly, various
variations and modifications are possible in the component parts
and/or arrangements of the subject combination arrangement within
the scope of the disclosure, the drawings and the appended claims.
In addition to variations and modifications in the component parts
and/or arrangements, alternative uses will also be apparent to
those skilled in the art.
* * * * *