KR101270816B1 - An air conditioner and a control method the same - Google Patents
An air conditioner and a control method the same Download PDFInfo
- Publication number
- KR101270816B1 KR101270816B1 KR1020110076381A KR20110076381A KR101270816B1 KR 101270816 B1 KR101270816 B1 KR 101270816B1 KR 1020110076381 A KR1020110076381 A KR 1020110076381A KR 20110076381 A KR20110076381 A KR 20110076381A KR 101270816 B1 KR101270816 B1 KR 101270816B1
- Authority
- KR
- South Korea
- Prior art keywords
- refrigerant
- compressor
- heat exchanger
- indoor
- unit
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02791—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using shut-off valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2509—Economiser valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to an air conditioner and a control method thereof.
An air conditioner according to an embodiment of the present invention includes an outdoor unit disposed in an outdoor space and having a first compressor for compressing a refrigerant and an outdoor heat exchanger for exchanging heat with outside air; An indoor unit disposed in an indoor space and having an indoor heat exchanger configured to exchange heat with indoor air; Multi-stage compression unit for connecting the outdoor unit and the indoor unit; An inlet pipe allowing the refrigerant discharged from the outdoor unit or the indoor unit to flow into the multi-stage compression unit; And a discharge pipe for discharging the refrigerant passing through the multi-stage compression unit to the outdoor unit or the indoor unit, wherein the multi-stage compression unit includes: a second compressor configured to further compress the refrigerant discharged from the first compressor; And a supercooled heat exchanger configured to overcool the refrigerant condensed in the outdoor heat exchanger or the indoor heat exchanger.
Description
The present invention relates to an air conditioner and a control method thereof.
The air conditioner is an appliance for keeping the indoor air in the most suitable condition according to the purpose and purpose. For example, in the summer, the room is controlled by a cool air condition, while in winter the room is controlled by a warm heating condition, by the humidity of the room, and by the clean air of the room.
In detail, the air conditioner is driven by a refrigeration cycle that performs the compression, condensation, expansion and evaporation process of the refrigerant, thereby performing the cooling or heating operation of the indoor space.
Such an air conditioner may be classified into a separate type air conditioner that separates the indoor unit and the outdoor unit, and an integrated air conditioner that combines the indoor unit and the outdoor unit into one device, depending on whether the indoor unit and the outdoor unit are separated.
In general, the outdoor unit includes a compressor for compressing a refrigerant, an outdoor heat exchanger for exchanging heat with the outside air, and an outdoor expansion device disposed at the outdoor side to reduce the refrigerant, and the indoor unit includes an indoor heat exchanger for exchanging heat with indoor air and an indoor side. An indoor expansion device disposed to depressurize the refrigerant.
On the other hand, when the air conditioner performs the heating operation, the amount of system refrigerant circulating the refrigeration cycle takes a lot. In this case, an input date to be input in order to achieve sufficient heating capacity, that is, a large amount of refrigerant to be sucked in the compressor is required.
However, according to the conventional air conditioner, when the air conditioner performs the heating operation, due to the limited system capacity (capacity), the amount of refrigerant circulating in the refrigerating system, in particular, the amount of refrigerant sucked into the compressor appeared to be insufficient.
Accordingly, there is a problem that the system capacity does not meet the required heating conditions (for example, increase in the amount of heating airflow, cryogenic outdoor temperature, etc.), and eventually the air conditioner does not achieve sufficient heating capacity.
In addition, when the refrigerant discharge temperature of the compressor is excessively increased according to the heating condition or the driving state of the refrigerant cycle, there is a problem that the compressor is overloaded and the heating efficiency is lowered.
On the other hand, if the degree of condensation of the refrigerant passing through the condenser, that is, the supercooling degree is not secured while the air conditioner performs the cooling operation, there is a problem that the cooling efficiency is lowered.
The present invention has been proposed to solve such a problem, and an object of the present invention is to provide an air conditioner having a multi-stage compression unit in order to improve cooling performance or heating performance.
An air conditioner according to an embodiment of the present invention includes an outdoor unit disposed in an outdoor space and having a first compressor for compressing a refrigerant and an outdoor heat exchanger for exchanging heat with outside air; An indoor unit disposed in an indoor space and having an indoor heat exchanger configured to exchange heat with indoor air; Multi-stage compression unit for connecting the outdoor unit and the indoor unit; An inlet pipe allowing the refrigerant discharged from the outdoor unit or the indoor unit to flow into the multi-stage compression unit; And a discharge pipe for discharging the refrigerant passing through the multi-stage compression unit to the outdoor unit or the indoor unit, wherein the multi-stage compression unit includes: a second compressor configured to further compress the refrigerant discharged from the first compressor; And a supercooled heat exchanger configured to overcool the refrigerant condensed in the outdoor heat exchanger or the indoor heat exchanger.
According to another aspect, a control method of an air conditioner includes: an air conditioner including an outdoor unit having a first compressor and an outdoor heat exchanger and an indoor unit having an indoor heat exchanger, wherein the refrigerant compressed by the first compressor is stored in the outdoor unit. Allowing condensation in the heat exchanger or the indoor heat exchanger; Introducing refrigerant discharged from the outdoor heat exchanger or the indoor heat exchanger into the multistage compression unit; Expanding at least some of the refrigerant introduced into the multistage compression unit; And exchanging the expanded refrigerant in a supercooled heat exchanger.
According to the present invention, since the refrigerant discharged from the outdoor heat exchanger may be supercooled while passing through the heat exchanger while the air conditioner performs the cooling operation, the cooling performance may be improved.
In addition, since the refrigerant discharged from the indoor unit may be bypassed and injected into the compressor while the air conditioner performs the heating operation, the amount of circulating refrigerant of the compressor may be increased, thereby improving heating capacity even in a poor heating condition. There is an effect.
In addition, when the discharge temperature of the compressor is increased, at least a portion of the refrigerant discharged from the indoor unit can be expanded and injected into the compressor, thereby preventing the discharge temperature of the compressor from being excessively increased and improving the heating performance. have.
As such, since the cooling and heating efficiency of the air conditioner is improved during the cooling or heating operation, reliability of the product may be improved and power consumption may be reduced.
1 is a block diagram showing the configuration of an air conditioner according to an embodiment of the present invention.
2 is a system diagram showing the configuration of a multi-stage compression unit according to an embodiment of the present invention.
3 is a system diagram showing the flow of the refrigerant in the cooling operation of the air conditioner according to an embodiment of the present invention.
4 is a system diagram showing the flow of the refrigerant during the heating operation of the air conditioner according to an embodiment of the present invention.
5 is a block diagram showing a control configuration of an air conditioner according to an embodiment of the present invention.
6 is a flowchart illustrating a control method for cooling operation of the air conditioner according to the embodiment of the present invention.
7 is a flowchart illustrating a control method for heating operation of an air conditioner according to an embodiment of the present invention.
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.
1 is a block diagram showing the configuration of an air conditioner according to an embodiment of the present invention.
Referring to FIG. 1, a refrigeration cycle in which a refrigerant circulates is driven in the air conditioner 1 according to the embodiment of the present invention. The air conditioner 1 may be cooled or heated according to the circulation direction of the refrigerant. Hereinafter, the configuration of the air conditioner will be described based on the cooling operation.
In order to drive the refrigeration cycle, the air conditioner 1 includes an
The
The
When the heating operation is performed, the refrigerant discharged from the
The
Hereinafter, the configuration of the
2 is a system diagram showing the configuration of a multi-stage compression unit according to an embodiment of the present invention.
2, in the
The
The
When the
In addition, the third inlet and
On the other hand, when the
And, the third inlet and
In the
The
The
In the
The
In the
In the heating process, since at least some of the refrigerant flowing through the
In the
The
In the
In the cooling process of the
In and out pipes (111, 112, 113, 114) and a plurality of pipes (115, 116, 117, 118, 123) described above may be understood to be a configuration of the refrigerant pipe (110) in a broad sense.
Hereinafter, the refrigerant flow in the
3 is a system diagram showing the flow of the refrigerant in the cooling operation of the air conditioner according to an embodiment of the present invention, Figure 4 is a view showing the flow of the refrigerant in the heating operation process of the air conditioner according to an embodiment of the present invention. System drawing.
Referring to FIG. 3, the refrigerant passing through the
In detail, at least some of the refrigerant flowing through the first entry and
Heat exchange is performed between the first
Then, the refrigerant passing through the second
As such, since the refrigerant may be further cooled in the
The laminated refrigerant may be introduced into the
The refrigerant of the
Referring to FIG. 4, the refrigerant passing through the
The refrigerant flows through the second inlet and
The refrigerant introduced into the
Meanwhile, the refrigerant introduced into the
Then, the
At least some of the refrigerant passing through the
The refrigerant flowing through the second
The refrigerant having passed through the second
As such, since at least some of the refrigerant flowing in the
On the other hand, when the discharge temperature of the
The injected refrigerant may be mixed with the refrigerant introduced through the
5 is a block diagram showing a control configuration of an air conditioner according to an embodiment of the present invention, Figure 6 is a flow chart showing a control method during the cooling operation of the air conditioner according to an embodiment of the present invention, Figure 7 is A flowchart illustrating a control method for heating operation of an air conditioner according to an embodiment of the present invention.
Referring to FIG. 5, the
When the
Therefore, when the outside air temperature is lower than the set temperature, the amount of the coolant circulated to the
On the other hand, when the discharge temperature of the
According to the opening degree of the
On the other hand, as described above, depending on whether the
Referring to FIG. 6, a control method in the case where the
The power of the
And, according to the cooling mode, the on / off of the flow rate control unit, that is, the plurality of valves (141 ~ 145) can be controlled. As described above, the
In addition, the
The refrigerant flowing through the
Referring to FIG. 7, a brief description will be given of a control method when the
The power of the
And, according to the heating mode, the flow rate control unit, that is, the on / off of the plurality of valves (141 ~ 145) can be controlled. As described above, the
A heating condition (outside air condition) may be recognized through the outside temperature sensor 53, and a discharge refrigerant temperature of the
According to the detected heating condition or the discharge temperature, ON / OFF of the
In detail, when the
The refrigerant passing through the
In addition, the amount of the refrigerant injected into the
For example, when the heating condition is not good, that is, when the outside temperature is cryogenic or the discharge temperature is higher than the set temperature, the opening degree of the
As described above, by injecting a part of the refrigerant circulating in the refrigerant system into the compressor in the heating operation mode, the amount of the refrigerant circulating in the compressor can be increased, thereby improving heating capacity and reducing the discharge temperature of the compressor. The effect is that it can.
10: air conditioner 20: outdoor unit
21: first compressor 23: outdoor heat exchanger
25: outdoor expansion device 30: indoor unit
33: indoor heat exchanger 35: indoor expansion device
100: multi-stage compression unit 110: refrigerant piping
111, 112, 113, 114: incoming and outgoing piping 120: supercooled heat exchanger
130:
Claims (12)
An indoor unit disposed in an indoor space and having an indoor heat exchanger configured to exchange heat with indoor air; And
It includes a multi-stage compression unit for connecting the outdoor unit and the indoor unit,
The multistage compression unit,
A second compressor configured to further compress the refrigerant discharged from the first compressor;
A subcooled heat exchanger configured to supercool the refrigerant condensed in the outdoor heat exchanger or the indoor heat exchanger;
A suction pipe for guiding the refrigerant compressed by the first compressor to the second compressor; And
And a valve member provided in the suction pipe, the valve member being selectively opened according to a cooling or heating operation mode.
The multistage compression unit,
An inlet pipe allowing the refrigerant discharged from the outdoor unit or the indoor unit to flow into the multi-stage compression unit;
A main pipe through which the refrigerant passing through the inflow pipe flows;
A branch pipe branched from the main pipe; And
Air conditioner further comprises an expansion device for expanding the refrigerant flowing through the branch pipe.
And the refrigerant passing through the expansion device is heat-exchanged with the condensed refrigerant in the subcooling heat exchanger.
In the heating mode, the air conditioner, the refrigerant heat exchanged with the condensed refrigerant is introduced into the second compressor.
In heating mode, the refrigerant compressed in the first compressor is further compressed in the second compressor.
In the cooling mode, the condensed refrigerant and the heat exchanged refrigerant is characterized in that the laminated to the main pipe.
Further comprising a discharge temperature sensor for detecting the discharge refrigerant temperature of the second compressor and an outside temperature sensor for detecting the temperature of the outside air,
The expansion device is an air conditioner, characterized in that the opening degree is adjusted based on the temperature value recognized by the discharge temperature sensor or the outside temperature sensor.
Allowing the refrigerant compressed in the first compressor to condense in the outdoor heat exchanger or the indoor heat exchanger;
Introducing refrigerant discharged from the outdoor heat exchanger or the indoor heat exchanger into a multistage compression unit having a second compressor;
Expanding at least some of the refrigerant introduced into the multistage compression unit; And
Wherein the expanded refrigerant is heat-exchanged in a subcooling heat exchanger,
The refrigerant compressed in the first compressor in the heating mode is introduced into the second compressor, and the refrigerant compressed in the first compressor in the cooling mode is restricted from entering the second compressor. Control method.
In the cooling mode,
The expanded portion of the refrigerant control method of the air conditioner, characterized in that the heat exchange with the remaining refrigerant of the refrigerant introduced into the multi-stage compression unit.
And after the expanded refrigerant is heat-exchanged in the subcooling heat exchanger, laminating with the remaining refrigerant.
In heating mode,
And the refrigerant exchanged in the subcooled heat exchanger is injected into the second compressor.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110076381A KR101270816B1 (en) | 2011-08-01 | 2011-08-01 | An air conditioner and a control method the same |
PCT/KR2012/006141 WO2013019072A2 (en) | 2011-08-01 | 2012-08-01 | Air conditioner and method of controlling the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110076381A KR101270816B1 (en) | 2011-08-01 | 2011-08-01 | An air conditioner and a control method the same |
Publications (2)
Publication Number | Publication Date |
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KR20130014740A KR20130014740A (en) | 2013-02-12 |
KR101270816B1 true KR101270816B1 (en) | 2013-06-05 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020110076381A KR101270816B1 (en) | 2011-08-01 | 2011-08-01 | An air conditioner and a control method the same |
Country Status (2)
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KR (1) | KR101270816B1 (en) |
WO (1) | WO2013019072A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101702736B1 (en) * | 2015-01-12 | 2017-02-03 | 엘지전자 주식회사 | An air conditioner |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004293813A (en) * | 2003-03-25 | 2004-10-21 | Sanyo Electric Co Ltd | Refrigerant cycle device |
JP2005315506A (en) * | 2004-04-28 | 2005-11-10 | Kobe Steel Ltd | Two-stage screw refrigerator |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05296584A (en) * | 1992-04-23 | 1993-11-09 | Hitachi Ltd | Refrigerating device |
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2011
- 2011-08-01 KR KR1020110076381A patent/KR101270816B1/en active IP Right Grant
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2012
- 2012-08-01 WO PCT/KR2012/006141 patent/WO2013019072A2/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004293813A (en) * | 2003-03-25 | 2004-10-21 | Sanyo Electric Co Ltd | Refrigerant cycle device |
KR100556170B1 (en) | 2003-03-25 | 2006-03-06 | 산요덴키가부시키가이샤 | Coolant cycle device |
JP2005315506A (en) * | 2004-04-28 | 2005-11-10 | Kobe Steel Ltd | Two-stage screw refrigerator |
Also Published As
Publication number | Publication date |
---|---|
WO2013019072A3 (en) | 2013-04-25 |
WO2013019072A2 (en) | 2013-02-07 |
KR20130014740A (en) | 2013-02-12 |
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