Water-cooled air conditioner

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

FIG. 1 is an air view illustrating a state where a water-cooled air conditioner according to an embodiment of the present invention is installed in a building;

FIG. 2 is a view illustrating flows of air and water in a building when an integral type water-cooled air conditioner according to an embodiment of the present invention operates;

FIG. 3 is an air view illustrating a state where a multiple water-cooled air conditioner according to another embodiment of the present invention is installed in a building;

FIG. 4 is a perspective view of an outdoor unit of a water-cooled air conditioner according to an embodiment of the present invention;

FIG. 5 is an exploded perspective view of an internal structure of the outdoor unit of FIG. 4;

FIG. 6 is a schematic view of the outdoor unit according to an embodiment of the present invention; and

FIG. 7 is a view illustrating flow of refrigerant during an air heating operation of a water-cooled air conditioner according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

FIG. 1 shows an air view illustrating a state where a water-cooled air conditioner according to an embodiment of the present invention is installed in a building, and FIG. 2 is a view illustrating flows of air and water in a building when an integral type water-cooled air conditioner according to an embodiment of the present invention operates.

Referring to FIGS. 1 and 2, a water-cooled air conditioner is installed in an enclosed space 52 formed in a building 50. The enclosed space 52 is completely isolated from an external side of the building 50 and communicates with an indoor space 62 through an air intake 60 formed through a ceiling to suck in indoor air.

A duct 70 is connected to the indoor space 62 to allow air heat-exchanged by the water-cooled air conditioner to be discharged into the indoor space 62. That is, the water-cooled air conditioner includes an indoor unit 100 for sucking in the indoor air and discharging it after a heat-exchanging process has been performed, and an outdoor unit 200 connected to the indoor unit 100 by a refrigerant pipe (130 of FIG. 3) that allows the refrigerant introduced through the refrigerant pipe to be heat exchanged with water. The duct 70 provides fluid communication between the indoor unit 100 and the indoor space 62.

The outdoor unit 200 includes a compressor 210, an accumulator (270 of FIG. 5), a second heat exchanger 290, and an outdoor linear expansion valve (234 of FIG. 6). The indoor unit 100 includes a first heat exchanger 120 and an expansion valve (not shown).

When the water-cooled air conditioner operates, the indoor air is introduced into the indoor unit 100 through the air intake H formed in the ceiling of the building.

For this indoor air circulation, an indoor fan 110 for making an indoor air current is installed in the indoor unit 100. In addition, the first heat exchanger 120 is installed to be inclined at a lower side of the indoor fan 110.

The first heat exchanger 120 is provided to condition the indoor air using the refrigerant flowing inside the first heat exchanger 120. The first heat exchanger 120 is connected to the second heat exchanger by the refrigerant pipe 130.

The refrigerant pipe 130 is designed to circulate the refrigerant between the indoor and outdoor units 100 and 200. A common liquid pipe (132 of FIG. 6) directs the flow of a liquid-phase refrigerant and a common gas pipe (134 of FIG. 6) directs the flow of a gas-phase refrigerant. Both pipes 132 and 134 may be of a single pipe design and are provided between the indoor and outdoor units 100 and 200.

That is, the common liquid pipe 132 connects the second heat exchanger 290 to the first heat exchanger 120 and the common gas pipe 134 connects the compressor 210 to the first heat exchanger 120.

Although the installing location of the indoor unit 100 may vary depending on a type of the water-cooled air conditioner (integral type or split type), an internal structure thereof is almost identical to that of a conventional indoor unit. Therefore, a detailed description of the indoor unit 100 will be omitted herein.

The outdoor unit 200 is provided under the indoor unit 100. The compressor 210 of the outdoor unit 200 compresses the refrigerant into a high temperature and a high pressure state. The second heat exchanger 290 of the outdoor unit 200 allows the refrigerant introduced from the compressor 210 to be heat-exchanged with water directed from a cooling tower 80 installed on, for example, a building top. The second heat exchanger 290 is provided with a waterway 202 communicating with an inside of the cooling tower 80. The waterway 202 includes a water inflow passage 202′ for directing the water from the cooling tower 80 to the second heat exchanger 290 and a water outflow passage 202″ for directing the water into the cooling tower 80 after it has been heat-exchanged with the refrigerant while passing through an inside of the second heat exchanger 290.

The following will describe a case where multiple water-cooled air conditioners are employed with reference to FIG. 3. FIG. 3 is an air view illustrating a situation where multiple water-cooled air conditioners are installed in a building according to another embodiment of the present invention.

As shown in FIG. 3, when multiple water-cooled air conditioners are provided, the indoor and outdoor units 100 and 200 are separated from each other and connected by a refrigerant pipe 130. That is, the indoor unit 100 is installed on the ceiling of the indoor space 62, and the outdoor unit 200 is installed in the enclosed space 52. The indoor and outdoor units 100 and 200 are connected to each other by the refrigerant pipe 130 so that the refrigerant can circulate and allow the indoor air to be heat-exchanged.

A first heat exchanger (not shown in FIG. 3) by which the indoor air is heat-exchanged with the refrigerant is provided in the indoor unit 100. An indoor fan 110 (similar to FIG. 2) is further provided to allow the heat-exchanged air to be discharged into the indoor space 62.

Like the integral type water-cooled air conditioner, the multiple water-cooled air conditioner includes a second heat exchanger for allowing the refrigerant to be heat-exchanged with the water. Since the circulations of the refrigerant and water in the second heat exchanger is identically realized to the integral type water-cooled air conditioner, a detailed description thereof will be omitted herein.

The following will describe the outdoor unit 200 in more detail with reference to the accompanying drawings.

FIG. 4 illustrates a perspective view of an outdoor unit of a water-cooled air conditioner according to an embodiment of the present invention, FIG. 5 illustrates an exploded perspective view of an internal structure of the outdoor unit of FIG. 4, and FIG. 6 illustrates a structure of the outdoor unit and flows of refrigerant and water in the cooling operation of the water-cooled air conditioner.

Referring to FIGS. 4 through 6, the outdoor unit 200 includes a top cover 204 formed in a rectangular shape that serves to divide the indoor unit 100 and the outdoor unit 200 from each other. Front and rear panels 205 and 207 define respectively front and rear outer appearances, side panels 208 define left and right outer appearances, and a base pan 209 is provided to support a plurality of components.

The top cover 204 is located at a top of the outdoor unit 200 to prevent the air passing through the indoor unit 100 from being introduced into the outdoor unit 200. That is, the top cover 204 is formed in a rectangular plate and acts as a barrier, free from any apertures.

The top cover 204 also functions to support the indoor unit 100 provided thereon. Therefore, the top cover 204 is provided with a reinforcing beam 204′ at a bottom edge for reinforcing strength thereof.

The front panel 205 is attached under a front end of the top cover 204. Service panels 206 are formed at a central left side and a lower left/right side of the front panel 205. The service panels 206 are provided to allow access to an interior of the outdoor unit 200 when a maintenance service is required due to a malfunctioning of a component installed in the outdoor unit 200. Each of the service panels 206 are provided with slits except for one side.

Therefore, the service panels 206 pivot on a side where no slit is formed to allow the interior of the outdoor unit 200 to communicate with an exterior, thereby allowing for the maintenance service.

The side panels 208 contact rear-left and rear-right ends of the front panel 205. Each of the side panels 208 are provided with a plurality of heat dissipation holes 208′ at an upper portion thereof, through which the heat generated by the operation of the compressor 210 is dissipated to the external side.

Although not shown in the drawings, the top cover 204, the front panel 205, the rear panel 207, and the side panel 208 may be provided with connection holes through which the common gas pipe 134 and the common liquid pipe 132 may pass and connect to the indoor unit 100.

The base pan 209 is provided to contact lower ends of the front, rear, and side panels 205, 207, and 208. The base pan 209 is provided to support a plurality of components. Particularly, the compressor 210 is provided on a top center of the base pan 209.

The compressor 210 is designed to compress the refrigerant to a high temperature/pressure state. The compressor 210 is comprised of left and right units. That is, the compressor 210 includes a constant speed compressor 212 operated at a constant speed and installed at a relatively right side and an inverter compressor 214 that is a variable speed heat pump installed to the left side of the constant speed compressor 212 and operated with a variable speed.

A pair of uniform fluid pipes 216 are installed between the constant speed compressor 212 and the inverter compressor 214 to fluidly connect them with each other. Therefore, when one of the compressors 212 and 214 is short of fluid, the fluid of the other is directed to the compressor that is short of the fluid, thereby preventing the compressor 210 from being damaged.

A scroll compressor where noise is not so intrusive may be used as the compressor 210. Particularly, an inverter scroll compressor whose RPM is controlled depending on a load capacity may be used as the inverter compressor 214.

Therefore, when the load applied to the compressor 210 is low, the inverter compressor 214 will operate first. Then, as the load capacity applied to the compressor 210 gradually increases and thus the inverter compressor 214 is unequal to the increased load capacity, the constant speed compressor 212 operates.

The compressor 210 is provided at an outlet side with a compressor discharge temperature sensor 217 for detecting a temperature of the refrigerant discharged from the compressor 210 and an oil separator 218. The oil separator 218 filters oil mixed in the refrigerant discharged from the compressor 210 and allows the filtered oil to be returned to the compressor 210.

That is, the oil used for cooling the frictional heat generated during the operation of the compressor 210 is discharged together with the refrigerant through an outlet of the compressor 210. The oil mixed with the refrigerant is separated by the oil separator 218 and returned to the compressor 210 through an oil recovery pipe 219.

The oil separator 218 is provided at an outlet with a check valve 232 for preventing the refrigerant from flowing back. That is, when only one of the constant speed compressor 212 and the inverter compressor 214 operates, the check valve 232 prevents the refrigerant from flowing into the other of the compressors.

The oil separator 218 is designed to communicate with a four-way valve 240 by a pipe. The four-way valve 240 is provided to convert the flow of the refrigerant according to an operation mode (cooling or heating mode) of the air conditioner. The four-way valve 240 includes an inlet port 242, a first outlet port 244, a second outlet port 246, and a third outlet port 248. The ports are connected to an outlet of the compressor 210 (or the oil separator 218), an inlet of the compressor 210 (or an accumulator 270), the second heat exchanger 290, and the indoor unit 100, respectively.

Therefore, the refrigerant discharged from the inverter compressor 214 and the constant speed compressor 212 is collected in a location and then directed to the four-way valve 240. The four-way valve 240 is provided at an inlet with a high pressure sensor 240′ for detecting the pressure of the refrigerant discharged from the compressor 210.

Meanwhile, a hot gas pipe 250 is installed for bypassing the four-way valve 240 to allow a portion of the refrigerant introduced into the four-way valve 240 to be directed to the accumulator 270 that will be described in more detail later.

The hot gas pipe 250 is provided to direct the high pressure refrigerant from an outlet side of the compressor 210 to the inlet of the hot gas pipe 250 when there is a need to increase the pressure of the low pressure refrigerant introduced into the accumulator 270 during the operation of the air conditioner. A hot gas valve 252 is installed on the hot gas pipe 250 to open and close the gas flow.

An over-cooler 260 is installed in the right, rear section of the base pan 209 (FIG. 5). The over-cooler 260 is provided to further cool the refrigerant that is heat-exchanged in the second heat exchanger 290. The over-cooler 260 is disposed on a portion of the outdoor liquid pipe 262, which is connected to the outlet of the second heat exchanger 290.

The over-cooler 260 is formed in a dual-pipe structure. That is, the over-cooler 260 includes an inner pipe (not shown) fluidly connected to the outdoor liquid-phase pipe 262, and an outer pipe surrounding the inner pipe.

A reverse transfer pipe 264 is branched off from the outlet of the over-cooler 260. The reverse transfer pipe 264 allows a portion of the refrigerant flowing along the outdoor liquid-phase pipe 262 to flow back through the outer pipe of the over-cooler 260.

An over-cooler expansion valve 266, for expansion cooling the refrigerant, is installed on the reverse transfer pipe 264. Therefore, a portion of the refrigerant flowing along the outdoor liquid-phase pipe 262 is re-directed into the reverse transfer pipe 264 and cools as it passes through the over-cooler expansion valve 266. The cooled refrigerant is then directed through the outer tube of the over cooler 260 and thus the refrigerant flowing along the inner tube is further cooled. The re-directed refrigerant that is discharged from the outer tube of the over-cooler is fed back to the accumulator 270, via over cooler recovering pipe 267.

The over-cooler 260 has a liquid pipe temperature sensor 263 at an outlet thereof (FIG. 6) for detecting the temperature of the refrigerant discharged from the outdoor unit 200. The over-cooler expansion valve 266 is located adjacent to an over-cooler inlet sensor 265, which detects the temperature of the re-directed refrigerant entering the over-cooler 260. The over-cooler recovering pipe 267, for guiding the re-directed refrigerant from the over-cooler 260 to the accumulator 270, is provided with an over-cooler outlet sensor 267′.

The accumulator 270 is installed in the left section of the base pan 209,—i.e., to the left of the inverter compressor 214 (FIG. 5). The accumulator 270 functions to filter out the liquid phase refrigerant and allow only the gas-phase refrigerant to be introduced into the compressor 210.

If the liquid-phase refrigerant that is directed from the indoor unit 100 is not vaporized before it is introduced into the compressor 210, it will be overloaded and thus damaged. The liquid-phase refrigerant that is introduced into the accumulator 270 is relatively heavier than the gas-phase refrigerant. Therefore, the liquid phase refrigerant will settle down at a lower portion of the accumulator 270 and only the gas-phase refrigerant is introduced into the compressor 210.

The accumulator 270 is provided with an intake pipe temperature sensor 272 near an inlet thereof, for detecting the temperature of the entering refrigerant, and a low pressure sensor 274 for detecting the pressure of the refrigerant.

Meanwhile, a control box 280 is installed behind the front panel 205. The control box 280 is formed in a rectangular shape and is selectively closed by a control cover 282 pivotally fixed on a top end of the control box 280.

Control components such as a voltage transformer, a printed circuit board, and a capacitor are provided in the control box 280 and a heat dissipation unit 284 with heat dissipation fins (not shown) formed on a rear surface of the control box 280.

The second heat exchanger 290 is provided at a rear side of the control box 280 to allow the refrigerant and the water to exchange heat with each other while passing therethrough. The second heat exchanger 290 is formed in a rectangular “plate-like” shape.

A plurality of water flow pipes and refrigerant flow pipes (not shown) are provided in the second heat exchanger 290 to prevent the refrigerant and the water from being mixed with each other. The water and refrigerant flow pipes are alternately arranged to be adjacent to each other so that the heat-exchange between the refrigerant and water can be effectively realized.

That is, the refrigerant flow pipes (not shown) are arranged to surround the water pipes (not shown) while the water pipes are arranged to surround the refrigerant flow pipes. Therefore, it will be preferable that the water and refrigerant pipes are designed to be substantially identical in a sectional shape and size with each other.

For example, the water and refrigerant flow pipes are formed in a hexagonal shape so that they can create a honeycomb arrangement.

The second heat exchanger 290 is provided at a front surface with water inflow and outflow pipes 292 and 293 through which the water is introduced into or discharged from the second heat exchanger 290 and refrigerant inflow and outflow pipes 294 and 295 through which the refrigerant is introduced into or discharged from the second heat exchanger 290.

That is, the water inflow and outflow pipes 292 and 293 are formed on front-right upper and lower portions of the second heat exchanger 290 and extend into the second heat exchanger to guide the water to and from the second heat exchanger 290. The water inflow pipe 292 is positioned below the water outflow pipe 293.

In addition, the refrigerant inflow and outflow pipes 294 and 295 are formed on front-left upper and lower portions of the second heat exchanger 290 and extend into the second heat exchanger 290 to guide the refrigerant to and from the second heat exchanger 290. The refrigerant inflow pipe 294 is positioned below the water outflow pipe 295.

When the water and refrigerant are introduced into the second heat exchanger 290, the water flows from a lower side to an upper side along the water flow pipe disposed in the second heat exchanger 290. The refrigerant introduced into the second heat exchanger 290 flows from the lower side to the upper side along the refrigerant flow pipe.

As the water and the refrigerant flow in opposite directions with respect to each other in the second heat exchanger 290, the heat exchange efficiency will be maximized.

An outdoor temperature sensor 296 is provided at a side of the second heater exchanger 290, i.e., adjacent to the water outflow pipe 293. The outdoor temperature sensor 296 is provided to detect the temperature of the water that is discharged through the water outflow pipe 293 after being heat exchanged with the refrigerant.

Meanwhile, according to a feature of the present invention, a refrigerant bypassing unit 300 is provided between the second heat exchanger 290 and the compressor 210. The refrigerant bypassing unit 300 is selectively operated when the water-cooled air conditioner is in the heating mode operation (FIG. 7). That is, the refrigerant bypassing unit 300 is designed to selectively operate depending on a temperature of water passing through the second heat exchanger 290.

The refrigerant bypassing unit 300 allows the refrigerant that is compressed to a high temperature/pressure state by the compressor to be directed to the second heat exchanger 290, thereby preventing the water in the second heat exchanger 290 from freezing.

To this end, the refrigerant bypassing unit 300 includes a refrigerant bypassing pipe 320 having a first end communicating with a lower portion of the second heat exchanger 290 and a second end communicating with the outlet of the compressor 210 and a bypassing blocking valve 340 for selectively preventing flow to the refrigerant bypassing pipe 320.

The refrigerant bypassing pipe 320 is provided to guide a portion of the refrigerant discharged from the compressor 210 into the second heat exchanger 290. Therefore, opposite ends of the refrigerant bypassing pipe 320 are respectively connected to a refrigerant outflow portion of the inverter compressor 214 and a refrigerant inflow portion of the second heat exchanger 290. That is, the opposite ends of the refrigerant bypassing pipe 320 communicate with the refrigerant outflow pipe 295 and the hot gas pipe 250, respectively.

Therefore, when the water-cooled air conditioner is in the heat mode operation, as shown in FIG. 7, a portion of the refrigerant discharged from the inverter compressor 214 may be directed to the indoor unit 100 through the four-way valve 240 just as it is on the cooling cycle. The rest of the refrigerant is introduced into the second heat-exchanger 290 along the refrigerant bypassing pipe 320, which is connected to the hot gas pipe 250 via the refrigerant outflow pipe 295.

One end (in FIG. 6) of the refrigerant bypassing pipe 320 is located to the right of the hot gas valve 252 so that the refrigerant can be introduced into the refrigerant bypassing pipe 320 regardless, if the hot gas valve 252 is opened or closed.

The bypassing blocking valve 340 is located at the end of the refrigerant bypassing pipe 320 closest to the inverter compressor 214. The bypassing blocking valve 340 is designed to operate depending on the temperature detected by the outdoor temperature sensor 296.

That is, when the temperature of the water outflow pipe 293 (when it is regarded that the temperature of the water outflow pipe 293 is same as that of the water in the water outflow pipe 293) is lowered to 0° C., the outdoor temperature sensor 296 generates a signal and transmits the same to the printed circuit board. Then, the printed circuit board opens the bypassing blocking valve 340.

Therefore, even when the water-cooled air conditioner is not used for many days and the outside temperature drops equal to or lower than 0° C., the damage to the second heat exchanger 290, due to the freezing of the water, can be prevented.

A heat exchanger support 298 is provided under the second heat exchanger 290 (FIG. 5) to ensure that the second heat exchanger 290 is spaced apart from the base pan 209. The top surface of the heat exchanger support 298 is slightly larger than the bottom surface of the second heat exchanger 290. A rear half of the heat exchanger support 298 is formed to extend and be inclined toward a lower-rear side from the top rear end. The lower end of the heat exchanger support 298 is fixedly coupled to the base pan 209.

The following will describe an operation of the above described water-cooled air conditioner with reference to FIGs. through 7. FIG. 7 is a view illustrating flow of refrigerant during an air heating operation of the water-cooled air conditioner according to an embodiment of the present invention, in which a refrigerant flow by the refrigerant bypassing unit is illustrated.

The following will describe the refrigerant flow in the outdoor unit in the cooling mode operation of the air conditioner.

As shown in FIG. 6, the outdoor electronic valve 234 is closed and the refrigerant discharged from the second heat exchanger 290 flows toward the outdoor unit. In addition, the bypassing blocking valve 340 is closed to prevent the refrigerant from being introduced into the refrigerant bypassing pipe 320.

Describing the refrigerant flow in the outdoor unit 200 with reference to FIG. 6, the gas-phase refrigerant is introduced from the indoor unit 100 into the four-way valve 240 through the third outlet port 248 and is directed to the accumulator 270 through the second outlet port 246. The gas-phase refrigerant coming out of the accumulator 270 goes into the compressor 210.

The refrigerant is compressed in the compressor 210 and discharged to pass through the oil separator 218. The oil contained in the refrigerant is separated and recovered into the compressor 210 through the oil recovery pipe 219. That is, as the refrigerant is compressed in the compressor 210, it is mixed with the oil. At this point, since the oil is in a liquid-phase, it can be separated from the refrigerant by the oil separator 218, that is a gas/liquid separator.

Then, the refrigerant discharged from the oil separator 218 is introduced into the four-way valve 240 through the inlet port 242 and is then directed to the second heat exchanger 290 through the first outlet port 244 of the four-way valve 240.

The discharged refrigerant is introduced into the second heat exchanger 290 through the refrigerant inflow pipe 294 and is heat-exchanged with the water introduced from the cooling tower 80 via water inflow pipe 292. The refrigerant is thereby converted into the liquid-phase refrigerant. Then, this liquid-phase refrigerant is directed to the over-cooler 260 to be further cooled.

At this same time, the water that is warmed during the heat exchange with the refrigerant in the second heat exchanger 290 is discharged out of the second heat exchanger 290. It is guided through water outflow pipe 293 and is then introduced into the cooling tower 80 via water outflow passage 202″.

The water introduced into the cooling tower 80 is cycled back into the second heat exchanger 290 through the water inflow passage 202′. This process is continuously repeated.

Meanwhile, the refrigerant passing through the over cooler 260 also passes through a dryer (not shown) where the moisture contained in the refrigerant is removed and is then introduced into the indoor unit 100. Then, the refrigerant is reduced in pressure by an expansion valve (not shown) and is heat-exchanged in the first heat exchanger 120 (FIG. 2). At this point, the first heat exchanger 120 functions as an evaporator and the refrigerant is changed into a low-pressure gas-phase.

The resulting low pressure, gas phase then refrigerant flows along the common gas-phase pipe 134 and is then introduced into the accumulator 270 via the four-way valve 240. The accumulator 270 filters off the liquid-phase refrigerant so that only the gas-phase refrigerant can be fed to the compressor 210. By the above-described series of processes, one cooling cycle is completed.

The following will describe a heat mode operation of the water-cooled air conditioner.

As shown in FIG. 7, in the heating mode operation, the outdoor electronic valve 234 and the bypassing blocking valve 340 are opened, allowing the refrigerant to flow through the refrigerant bypassing pipe 320.

Describing the refrigerant flow in the outdoor unit 200 in more detail with reference to FIG. 7, the refrigerant is introduced from the indoor unit 100 into the outdoor unit 200 along the common liquid-phase pipe 132.

The refrigerant introduced into the outdoor unit 200 is directed into the second heat exchanger 290 through the refrigerant outflow pipe 295. The refrigerant introduced into the second heat exchanger 290 is heat-exchanged with the water and discharged from the second heat exchanger 290 through the refrigerant inflow pipe 294.

Meanwhile, the water passing through the second heat exchanger 290 circulates to and from the cooling tower 80 via water in flow pipe 292 and water out flow pipe 293. The water introduced from the cooling tower 80 into the second heat exchanger 290 is cooled by heat-exchanging with the refrigerant flowing therein. The cooled water is then discharged out of the second heater exchanger 290 and returned to the cooling tower 80 via water outflow passage 202″.

The water introduced in the cooling tower 80 increases in temperature by heat-exchanging with the outdoor air and is cycled back into the second heat exchanger 290 through the water inflow passage 202′. The process is repeated.

Meanwhile, the refrigerant discharged from the second heat exchanger 290 is introduced into the accumulator 270 via the first and second outlet ports 244 and 246 of the four-way valve 240. The accumulator 270 filters off the liquid-phase refrigerant so that only the gas-phase refrigerant can be fed to the compressor 210.

A portion of the refrigerant discharged from the inverter compressor 214 (i.e., that which is not diverted into the refrigerant bypassing pipe 320) and the refrigerant discharged from the constant speed compressor 212 are introduced into the indoor unit 100 through the common gas-phase pipe 134. More specifically, the compressed refrigerant exiting compressor 210 is directed to the inlet portion 242 of the four-way valve 240 and exits through the third outlet portion 248, which is fluidly connected to the common gas-phased pipe 134.

The refrigerant introduced into the indoor unit 100 is then condensed while passing through the first heat exchanger 120, after which it is re-introduced into the outdoor unit 200 along the common liquid-phase pipe 132. The refrigerant introduced into the outdoor unit 200 is directed again into the second heat exchanger 290. By the above-described series of processes, one heating cycle is completed.

The air conditioner is generally operated with the heating mode during winter. The outdoor temperature sensor 296 keeps operating year-round to detect the water temperature of the water outflow pipe 293. When the water temperature detected by the outdoor temperature sensor 296 is equal to or less than 0° C., the water in the second heat exchanger 290 may be frozen. Therefore, the temperature of the refrigerant introduced into the second heat exchanger 290 is controlled using the refrigerant bypassing unit 300.

That is, when the temperature of the water discharged through the second heat exchanger 290 is equal to or less than 0° C., this is detected by the outdoor temperature sensor 296 and a signal is generated. This signal is transmitted to the printed circuit board which opens the refrigerant bypassing pipe 320 by applying the electric power to the bypassing blocking valve 340. Therefore, a portion of the high temperature/pressure refrigerant compressed by and discharged from the inverter compressor 214 is introduced into the second heat exchanger 290 through the refrigerant bypassing pipe 320.

In more detail, the temperature of the refrigerant that is discharged from the indoor unit 100 and passes through the outdoor electronic valve 234 is relatively low. Therefore, this low temperature refrigerant is mixed with the high temperature refrigerant introduced through the refrigerant bypassing pipe 320. The mixed refrigerant is then introduced into the second heat exchanger 290.

Accordingly, the temperature of the refrigerant passing through the second heat exchanger 290 becomes higher than it would be if no refrigerant bypassing unit 300 were used. As a result, the temperature of the water that is heat-exchanged with the heated refrigerant in the second heat exchanger 290 becomes relatively higher. Thus, the freezing of the water can be prevented.

During the operation of the refrigerant bypassing unit 300, when the water temperature detected by the outdoor temperature sensor 296 becomes greater than Or, the bypassing blocking valve 340 is closed to block the refrigerant bypassing pipe 320, thereby stopping the operation of the refrigerant bypassing unit 300.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

For instance, the threshold temperature (0° C.), described above, that is set to control operation of the refrigerant bypassing unit 300 may vary if desired. That is, the preferable threshold temperature may be 1° C. or 3° C. In addition, the outdoor temperature sensor 296 may be designed to detect a temperature of outdoor air instead of detecting the temperature of the water.

It will be apparent to those skilled in the art that various modifications and variation can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Water-cooled air conditioner

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CPC

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Priority Claims (1)