Patent Grant
9127865
The present application claims priority under 35 U.S.C. 119 and 35 U.S.C. 365 to Korean Patent Application No. 10-2008-0083629 (filed on Aug. 27, 2008), which is hereby incorporated by reference in its entirety.
The present disclosure relates to an air conditioning system, and more particularly, to an air conditioning system that can be used for both cooling and heating.
In general, an air conditioning system includes a compressor, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger that are used to perform heat exchange cycles for cooling or heating an indoor area. In heating mode, the outdoor heat exchanger is operated as an evaporator, and the indoor heat exchanger is operated as a condenser. In detail, indoor heating is performed as follows: while refrigerant is evaporated in the outdoor heat exchanger, heat is exchanged between the refrigerant and outdoor air; the refrigerant is then compressed to a high-temperature and high-pressure state by the compressor; and while the compressed refrigerant is condensed at the indoor heat exchanger, heat is exchanged between the refrigerant and indoor air.
A refrigerant heating device can be used to heat the refrigerant evaporated in the outdoor heat exchanger in heating mode. That is, in the case where refrigerant is not smoothly evaporated in the outdoor heat exchanger due to a very low outdoor temperature, the refrigerant is heated before the refrigerant is transferred to the compressor. In more detail, refrigerant condensed at the indoor heat exchanger is evaporated at the outdoor heat exchanger or heated by the refrigerant heating device, and the refrigerant is transferred to the compressor.
Embodiments provide an air conditioning system in which refrigerant is not accumulated in an outdoor heat exchanger in heating mode.
In one embodiment, an air conditioning system includes a compressor; an outdoor heat exchanger that discharges evaporated refrigerant; and a first pipe coupling the outdoor heat exchanger and the compressor, where the first pipe allows the outdoor heat exchanger to receive at least a portion of the compressed refrigerant from the compressor.
In another embodiment, an air conditioning system includes an outdoor heat exchanger; a compressor; a heater; a first pipe coupling the outdoor heat exchanger and the heater; and a second pipe coupling the first pipe and the compressor.
According to the present disclosure, the air conditioning system can be operated more stably.
The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims.
An air conditioning system will now be described in more detail with reference to the accompanying drawings according to a first embodiment.
Referring to
In more detail, the indoor units 100 and 100′ include indoor heat exchangers 110 and 110′, respectively. The indoor heat exchangers 110 and 110′ are operated as condensers in heating mode and evaporators in cooling mode. That is, in heating mode, the indoor heat exchangers 110 and 110′ receive refrigerant compressed by a compressor 220 (described later) and condense the refrigerant. In cooling mode, the indoor heat exchangers 110 and 110′ receive refrigerant condensed by an outdoor heat exchanger 210 and evaporate the refrigerant.
The indoor units 100 and 100′ further include linear expansion valves (LEVs) 120 and 120′, respectively. In cooling mode, the linear expansion valves 120 and 120′ of the indoor units 100 and 100′ are used to expand refrigerant evaporated by the indoor heat exchangers 110 and 110′. In heating mode, the linear expansion valves 120 and 120′ of the indoor units 100 and 100′ are opened so that refrigerant can pass through the linear expansion valves 120 and 120′.
The outdoor heat exchanger 210 is included in the outdoor unit 200. The outdoor heat exchanger 210 is operated as an evaporator in heating mode and a condenser in cooling mode. In other words, in heating mode, the outdoor heat exchanger 210 evaporates refrigerant condensed by the indoor heat exchangers 110 and 110′ and transfers the evaporated refrigerant to the compressor 220. In cooling mode, the outdoor heat exchanger 210 condenses refrigerant and transfers the condensed refrigerant to the indoor heat exchangers 110 and 110′.
The compressor 220 is included in the outdoor unit 200. The compressor 220 compresses refrigerant and discharges the compressed refrigerant to the indoor heat exchangers 110 and 110′ or the outdoor heat exchanger 210. In more detail, the compressor 220 compresses refrigerant and discharges the compressed refrigerant to the indoor heat exchangers 110 and 110′ in heating mode and to the outdoor heat exchanger 210 in cooling mode.
The outdoor unit 200 further includes a linear expansion valve 230. In heating mode, the linear expansion valve 230 of the outdoor unit 200 expands refrigerant condensed by the indoor heat exchangers 110 and 110′ and transfers the refrigerant to the outdoor heat exchanger 210. In cooling mode, the linear expansion valve 230 of the outdoor unit 200 is closed, or the opening of the opened linear expansion valve 230 is adjusted.
The outdoor unit 200 further includes a parallel pipe 240 and a check valve 250. The parallel pipe 240 is connected in parallel to a refrigerant pipe through which refrigerant flows to the outdoor heat exchanger 210 in heating mode. The check valve 250 is disposed at the parallel pipe 240.
The outdoor unit 200 further includes a four-way valve 260. The four-way valve 260 is disposed at refrigerant pipes through which refrigerant compressed by the compressor 220 flows. In heating mode, the four-way valve 260 is positioned in a manner such that refrigerant compressed by the compressor 220 can flow to the indoor heat exchangers 110 and 110′ and refrigerant evaporated by the outdoor heat exchanger 210 can flow to the compressor 220. In cooling mode, the four-way valve 260 is positioned in a manner such that refrigerant compressed by the compressor 220 can be discharged to the outdoor heat exchanger 210 and refrigerant condensed by the outdoor heat exchanger 210 can be transferred to the indoor heat exchangers 110 and 110′.
The outdoor unit 200 further includes first to third connection pipes 271, 273, and 275. The first connection pipe 271 connects the outdoor heat exchanger 210 and the refrigerant heating device 300. In heating mode, refrigerant evaporated by the outdoor heat exchanger 210 flows to the refrigerant heating device 300 through the first connection pipe 271. The second connection pipe 273 connects the refrigerant heating device 300 to a refrigerant pipe connected from the indoor heat exchangers 110 and 110′ to the outdoor heat exchanger 210. In heating mode, refrigerant condensed by the indoor heat exchangers 110 and 110′ flows to the refrigerant heating device 300 through the second connection pipe 273. The third connection pipe 275 connects the compressor 220 and the refrigerant heating device 300. In heating mode, refrigerant heated by the refrigerant heating device 300 flows to the compressor 220 through the third connection pipe 275.
The outdoor unit 200 further includes first and second valves 281 and 283. The first valve 281 is disposed at the first connection pipe 271. In heating mode, the first valve 281 is closed if the refrigerant heating device 300 is used to heat refrigerant. The first valve 281 is opened in cooling mode or in heating mode if the refrigerant heating device 300 is not used. The second valve 283 is disposed at the second connection pipe 273. The second valve 283 is opened in heating mode if the refrigerant heating device 300 is used to heat refrigerant. The second valve 283 is closed in cooling mode or in heating mode if the refrigerant heating device 300 is not used.
The outdoor unit 200 further includes a bypass pipe 291 and a third valve 293. The bypass pipe 291 connects the first connection pipe 271 with a refrigerant pipe through which refrigerant discharged from the compressor 220 flows toward the indoor heat exchangers 110 and 110′ in heating mode. The bypass pipe 291 provides a flow path for refrigerant compressed by the compressor 220 and discharged toward the outdoor heat exchanger 210. The third valve 293 is disposed at the bypass pipe 291. The third valve 293 is opened when refrigerant accumulated in the outdoor heat exchanger 210 is re-circulated in a heat exchange cycle.
In heating mode, the refrigerant heating device 300 heats refrigerant evaporated by the outdoor heat exchanger 210. For this, the refrigerant heating device 300 includes an auxiliary heat exchanger 310 and a heating unit 320.
In more detail, refrigerant flows from the first connection pipe 271 or the second connection pipe 273 to the inside of the auxiliary heat exchanger 310. The heating unit 320 heats the auxiliary heat exchanger 310 so that refrigerant flowing through the auxiliary heat exchanger 310 can be heated.
An exemplary operation of the air conditioning system will now be described in detail according to the first embodiment.
Referring to
In more detail, refrigerant compressed by the compressor 220 is discharged to the indoor heat exchangers 110 and 110′ through the four-way valve 260. Then, at the indoor heat exchangers 110 and 110′, the refrigerant exchanges heat with indoor air and condenses. Therefore, indoor areas can be heated.
Next, the refrigerant condensed at the indoor heat exchangers 110 and 110′ passes through the linear expansion valves 120 and 120′ of the indoor units 100 and 100′ and flows to the auxiliary heat exchanger 310 through the second connection pipe 273. At this time, while the refrigerant flows in the second connection pipe 273 toward the auxiliary heat exchanger 310, the refrigerant expands at the second valve 283. Then, the refrigerant reaches the auxiliary heat exchanger 310 where the refrigerant is heated by the heating unit 320 and is discharged to the third connection pipe 275. The refrigerant flows from the third connection pipe 275 to the compressor 220, thereby completing one cycle of heat exchange. At this time, since the third valve 293 is in a closed state, the refrigerant compressed at the compressor 220 is not discharged to the outdoor heat exchanger 210 through the bypass pipe 291. Furthermore, owing to the check valve 250, the refrigerant compressed at the compressor 220 is not discharged to the outdoor heat exchanger 210 through the parallel pipe 240.
Referring to
In more detail, refrigerant compressed by the compressor 220 is discharged to the indoor heat exchangers 110 and 110′ where the refrigerant is condensed. The refrigerant condensed at the indoor heat exchangers 110 and 110′ is transferred to the auxiliary heat exchanger 310 and heated by the heating unit 320. Then, the refrigerant is sucked by the compressor 220.
Meanwhile, some of the refrigerant compressed by the compressor 220 is transferred to the first connection pipe 271 through the bypass pipe 291. At this time, since the first valve 281 is closed, the refrigerant transferred to the first connection pipe 271 is directed to the outdoor heat exchanger 210. Since the opened linear expansion valve 230 of the outdoor unit 200 is opened, the refrigerant, together with refrigerant accumulated in the outdoor heat exchanger 210, flows from the outdoor heat exchanger 210 to a refrigerant pipe connected from the outdoor heat exchanger 210 to the indoor heat exchangers 110 and 110′ and to the parallel pipe 240 where the check valve 250 is disposed. However, refrigerant condensed at the indoor heat exchangers 110 and 110′ flows toward the outdoor heat exchanger 210 through the refrigerant pipe connected from the outdoor heat exchanger 210 to the indoor heat exchangers 110 and 110′. Therefore, the refrigerant transferred to the outdoor heat exchanger 210 through the bypass pipe 291 and the first connection pipe 271, and the refrigerant accumulated in the outdoor heat exchanger 210 are transferred to the auxiliary heat exchanger 310 through the second connection pipe 273 after they flow along some length of the refrigerant pipe connected from the outdoor heat exchanger 210 to the indoor heat exchangers 110 and 110′. Then, the refrigerant transferred to the auxiliary heat exchanger 310 is heated by the heating unit 320 and sucked by the compressor 220.
Refrigerant accumulated in the outdoor heat exchanger 210 may be re-circulated in this way when insufficient refrigerant circulates in a heat exchange cycle. For example, when the temperature of refrigerant discharged from the compressor 220 is equal to or higher than a reference temperature, it may be determined that the amount of refrigerant circulating in the heat exchange cycle is insufficient.
Referring to
In more detail, refrigerant compressed by the compressor 220 is discharged to the outdoor heat exchanger 210. At the outdoor heat exchanger 210, the refrigerant is condensed by heat exchange with outdoor air.
The refrigerant condensed at the outdoor heat exchanger 210 is transferred to the indoor heat exchangers 110 and 110′. While the refrigerant is transferred from the outdoor heat exchanger 210 to the indoor heat exchangers 110 and 110′, the refrigerant is expanded by the linear expansion valves 120 and 120′ of the indoor units 100 and 100′.
At the indoor heat exchangers 110 and 110′, the refrigerant is evaporated by heat exchange with indoor air. Therefore, the indoor areas can be cooled by heat exchange between the indoor air and the refrigerant at the indoor heat exchangers 110 and 110′.
After the heat exchange, the refrigerant is transferred from the indoor heat exchangers 110 and 110′ to the compressor 220 through the four-way valve 260. The compressor 220 compresses the refrigerant and discharges the compressed refrigerant to the auxiliary heat exchanger 310. At this time, since the heating unit 320 is not operated, the refrigerant discharged to the auxiliary heat exchanger 310 is not heated by the heating unit 320.
Meanwhile, since the first valve 281 is opened, the refrigerant is discharged from the auxiliary heat exchanger 310 to the outdoor heat exchanger 210 through the first connection pipe 271. At the outdoor heat exchanger 210, the refrigerant is condensed by heat exchange with outdoor air. The condensed refrigerant is transferred to the indoor heat exchangers 110 and 110′ through the refrigerant pipe connected from the outdoor heat exchanger 210 to the indoor heat exchangers 110 and 110′, and the parallel pipe 240 connected in parallel to the refrigerant pipe.
An air conditioning system will now be described in detail with reference to the accompanying drawing according to a second embodiment.
Referring to
The opened areas of a second valve 583 and the fourth valve 585 are adjusted according to the heating load of indoor area. In more detail, if the second valve 583 is less opened and the fourth valve 585 is more opened, the amount of refrigerant bypassed through the bypass pipe 577 is increased. On the other hand, if the second valve 583 is more opened and the fourth valve 585 is less opened, the amount of refrigerant bypassed through the bypass pipe 577 is decreased.
Referring to
In the current embodiment, other elements of the air conditioning system, such as an indoor heat exchanger 410 and a linear expansion valve 420 of an indoor unit 400, an outdoor heat exchanger 510 of an outdoor unit 500, a compressor 520, a linear expansion valve 530, a parallel pipe 540, a check valve 550, a four-way valve 560, first to third connection pipes 571, 573, and 575, first and second valves 581 and 583, the bypass pipe 591, and a third valve 593, have similar structures as those of the air conditioning system of the first embodiment. Thus, detailed descriptions thereof will be omitted.
An air conditioning system will now be described in detail with reference to the accompanying drawing according to a third embodiment.
Referring to
The pump 960 forces a working fluid to circulate through the fluid pipe 950 so that refrigerant flowing through the heating pipe 940 can exchange heat with the working fluid at the heat exchange unit 930. At this time, some of the working fluid is bypassed to the heating unit 920 through the second bypass pipe 980.
The fourth valve 970 is disposed at the second bypass pipe 980. The fourth valve 970 is used to adjust heating of the refrigerant flowing through the heating pipe 940 according to the heating load of indoor areas. In more detail, the fourth valve 970 is turned on or off or the opening of the fourth valve 970 is adjusted so as to adjust the amount of working fluid bypassed through the second bypass pipe 980. In other words, if the fourth valve 970 is turned off, the working fluid is not bypassed through the second bypass pipe 980. If the opened area of the fourth valve 970 is increased or decreased, the amount of working fluid bypassed through the second bypass pipe 980 is increased or decreased. Therefore, at the heat exchange unit 930, the amount of working fluid flowing through the fluid pipe 950 for changing heat with the refrigerant flowing through the heating pipe 940 can be adjusted. Accordingly, heating of the refrigerant flowing through the heating pipe 940 can be adjusted. This adjustment of the heating of the refrigerant flowing through the heating pipe 940 may be performed according to the heating load of the indoor areas.
Other elements of the air conditioning system of the current embodiment, such as an indoor heat exchanger 710 and a linear expansion valve 720 of an indoor unit 700, an outdoor heat exchanger 810 of an outdoor unit 800, a compressor 820, a linear expansion valve 830, a parallel pipe 840, a check valve 850, a four-way valve 860, first to third connection pipes 851, 873, and 875, first and second valves 881 and 883, a bypass pipe 891, and a third valve 893, have similar structures as those of the air conditioning systems of the first and second embodiments. Thus, detailed descriptions thereof will be omitted.
As described above, according to the air conditioning system of the present disclosure, if refrigerant is heated by the refrigerant heating device in heating mode, some of refrigerant compressed by the compressor is bypassed to the outdoor heat exchanger. Therefore, owing to the refrigerant bypassed to the outdoor heat exchanger, refrigerant accumulated in the outdoor heat exchanger can be re-circulated in heat exchange cycles so that the amount of refrigerant circulating in the heat exchange cycles does not become insufficient.
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.
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