KR100744504B1 - cooling and heating system - Google Patents

Abstract

The present invention relates to an air conditioning system, and more particularly, to a cooling and heating system capable of performing heating using district heating hot water without providing a separate heating indoor unit.

To this end, the present invention, the compressor, the indoor heat exchanger, the expansion device and the outdoor heat exchanger are sequentially connected by the refrigerant pipe, and during the heating operation to exchange the flow refrigerant with hot water on the refrigerant pipe, the refrigerant between the expansion device and the compressor The pipe is composed of first and second parallel pipes connected in parallel, the first parallel pipe is installed with an outdoor heat exchanger, the second parallel pipe is installed with a first heating device for heating the refrigerant by hot water. It provides a cooling and heating system.

Air conditioning and heating system

Description

Cooling and heating system

Figure 1a is a block diagram showing a first embodiment of a heating and cooling system according to the present invention.

Figure 1b is a block diagram showing a modification of the air conditioning system of Figure 1a.

Figure 2a is a block diagram showing a second embodiment of the heating and cooling system according to the present invention.

Figure 2b is a block diagram showing a modification of the air conditioning system of Figure 2a.

Figure 2c is a block diagram showing the operation of the heating and cooling system of Figure 2a.

Figure 3a is a block diagram showing a third embodiment of a heating and cooling system according to the present invention.

Figure 3b is a block diagram showing a modification of the air conditioning system of Figure 3a.

Figure 4a is a block diagram showing a fourth embodiment of a heating and cooling system according to the present invention.

Figure 4b is a block diagram showing a modification of the air conditioning system of Figure 4a.

Figure 4c is a block diagram showing the operation of the air conditioning system of Figure 4a.

Explanation of symbols on the main parts of the drawings

111 compressor 112 indoor heat exchanger

113: expansion device 114: outdoor heat exchanger

121: first parallel tube 122: second parallel tube

123: connecting pipe 124, 125: refrigerant pipe

131: first heating device 132: second heating device

133: third heating device 134: fourth heating device

131a, 132a, 133a, 134a: temperature sensing means 131b, 132b, 133b, 134b: valve

The present invention relates to a cooling and heating system, and more particularly to a cooling and heating system that can perform heating without having a separate heating system.

In general, an air conditioning system is a device that cools and / or heats an indoor space by performing a process of compressing, condensing, expanding, and evaporating a refrigerant.

The air conditioning system is divided into a general air conditioning system in which one indoor unit is connected to an outdoor unit, and a multi air conditioning system in which a plurality of indoor units are connected to an outdoor unit. In addition, the air conditioning system is divided into a cooling system for supplying only cold air to the room by operating the refrigerant cycle in only one direction, and a cooling and heating system for supplying cold or warm air to the room by selectively operating the refrigerant cycle in both directions.

In recent years, buildings have been concentrated such as apartment complexes, or many apartment complexes have been concentrated in neighboring areas. In these dense areas, hot water is supplied centrally for energy saving or convenience of living. In the district heating method, heating is performed using hot water.

In districts using district heating, there are cases where the building has both air conditioning and heating systems. In this manner, a cooling only system using a refrigerant pipe is disposed for each building, and a heating exclusive indoor unit using a hot water pipe is disposed separately from the cooling only system. Therefore, in the heating operation, the district heating hot water is circulated to the heating-only indoor unit to perform heating, while in the cooling operation, the cooling exclusive system is operated to perform cooling.

However, the conventional air conditioning system has the following problems.

First, since the conventional regional air-conditioning system installs an indoor unit dedicated to heating separately from a system for exclusive use of air conditioning, there is a problem in that a double installation cost is required to equip all of the air conditioning systems.

Second, the conventional district heating and cooling system has a problem that the heating dedicated system and the cooling dedicated system is arranged separately, the cost is increased to maintain and repair them.

Third, the conventional general air conditioning system compresses and circulates a refrigerant by a compressor during a heating operation, thereby increasing the compression work by the compressor, thereby increasing power consumption.

Fourth, in the conventional general air conditioning system, the frost is frozen in the outdoor heat exchanger during the heating operation. Therefore, since the defrosting operation of circulating the refrigerant in the cooling mode is performed, there is a problem in that the heating operation cannot be continuously implemented.

In order to solve the above-mentioned problems, it is an object of the present invention to provide a heating and cooling system that does not need to provide a separate indoor unit for hot water heating, maintenance and repair costs are reduced.

Another object of the present invention is to provide a heating and cooling system that can reduce the work of the compressor to reduce the power consumption.

Still another object of the present invention is to provide a cooling and heating system capable of continuously performing a heating operation.

In order to achieve the above object, according to one embodiment of the present invention, a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are sequentially connected by a refrigerant pipe, and during the heating operation, the flowing refrigerant is exchanged with hot water on the refrigerant pipe, The refrigerant pipe between the expansion device and the compressor is composed of first and second parallel pipes connected in parallel, the first parallel pipe is provided with an outdoor heat exchanger, and the second parallel pipe is configured to heat the refrigerant by hot water. It provides a heating and cooling system, characterized in that the heating device is installed.

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A predetermined portion of the first and second parallel tubes may be provided with a connecting tube for communicating the refrigerant passage, and the connecting tube may be provided with a valve to open and close the refrigerant passage. In addition, it is preferable that a second heating device for heating the refrigerant by hot water is provided in the first parallel tube between the outdoor heat exchanger and the compressor. Preferably, a third heating device for heating the refrigerant by hot water is installed in the refrigerant pipe between the compressor and the indoor heat exchanger.

In addition, a bypass pipe is connected to the refrigerant pipe between the expansion device and the indoor heat exchanger, and the refrigerant pipe between the compressor and the outdoor heat exchanger, and the fourth heating device for heating the refrigerant by hot water to the bypass pipe. It is preferable to install more.

The bypass pipe is preferably provided with a check valve that is opened when the pressure of the refrigerant is higher than the predetermined pressure. At this time, the check valve is more preferably installed on the refrigerant suction side of the fourth heating device.

Further, it is preferable that a temperature sensing means is provided on the refrigerant discharge side of the first, second, third and fourth heating devices.

According to another aspect of the present invention, the refrigerant pipe between the expansion device and the outdoor heat exchanger is composed of first and second parallel pipes connected in parallel, and the second parallel pipe has a first heating for heating the refrigerant by hot water. The device is installed.

The second parallel tube is preferably provided with a valve to open and close the refrigerant passage. At this time, the valve is more preferably installed on the refrigerant suction side of the first heating device.

In the refrigerant pipe between the outdoor heat exchanger and the compressor, a second heating device for heating the refrigerant by hot water is preferably provided. In addition, it is preferable that a third heating device for heating the refrigerant by hot water is installed in the refrigerant pipe between the compressor and the indoor heat exchanger.

In addition, a bypass pipe is connected to the refrigerant pipe between the expansion device and the indoor unit, and the refrigerant pipe between the compressor and the outdoor heat exchanger, and the fourth heating device is installed in the bypass pipe to heat the refrigerant by hot water. It is desirable to be.

The bypass pipe is preferably provided with a check valve that is opened when the pressure of the refrigerant is higher than the predetermined pressure. More preferably, the check valve is installed on the refrigerant suction side of the fourth heating device.

At this time, it is more preferable that a temperature sensing means is installed on the refrigerant discharge side of the first, second, third and fourth heating devices.

According to another aspect of the present invention, a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are sequentially connected by a refrigerant pipe, and a bypass between the refrigerant pipe between the expansion device and the indoor unit and the compressor and the outdoor heat exchanger is provided. A pipe is connected, and the bypass pipe provides a heating and cooling system, characterized in that a heating device is installed to heat exchange the flow refrigerant with hot water.

The bypass pipe is preferably provided with a check valve that is opened when the pressure of the refrigerant is higher than the predetermined pressure. At this time, the check valve is more preferably installed on the refrigerant suction side of the heating device.

Still another aspect of the present invention provides a control method of a cooling and heating system, wherein, during a defrosting operation, the valve of the second parallel tube is opened and hot water is supplied to the first heating device.

In addition, when it is determined that hot water is introduced into the fourth heating device of the bypass pipe during the heating operation, the control method of the cooling and heating system is characterized by supplying hot water to the fourth heating device.

In addition, during the heating operation, if it is determined that the refrigerant sucked into the heating device is less than the predetermined temperature set in the control unit provides a control method of a cooling and heating system, characterized in that for supplying hot water to the heating device.

Therefore, according to the present invention, there is no need to provide a separate indoor indoor unit for heating, maintenance and repair costs can be reduced, power consumption can be reduced, and heating operation can be continuously performed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to Figure 1a, the first embodiment of the air conditioning system according to the present invention will be described.

 In the air-conditioning system, the compressor 111, the indoor heat exchanger 112, the expansion device 113, and the outdoor heat exchanger 114 are sequentially connected by a refrigerant pipe, and heat exchange the flow refrigerant with hot water during the heating operation. Here, the hot water means hot water for district heating supplied from the outside of a cooling and heating system such as a cogeneration plant or a waste heat generating plant. This hot water is maintained at a temperature of about 70 ~ 90 ℃ when it reaches the building. Therefore, such hot water can be effectively applied to the refrigerant cycle. Hereinafter, hot water will be referred to.

In this case, the refrigerant pipe between the expansion device 113 and the compressor 111 is composed of first and second parallel pipes 121 and 122 connected in parallel, and the first parallel pipe 121 has an outdoor heat exchanger 114. Is installed.

In addition, the second parallel tube 122 is preferably provided with a first heating device 131 for heating the refrigerant by hot water. The first heating device 131 heats the refrigerant expanded in the expansion device 113 during the heating operation so that the refrigerant in the gaseous state flows into the compressor 111 through the second parallel tube 122.

Predetermined portions of the first and second parallel pipes 121 and 122 are provided with a connection pipe 123 for communicating a refrigerant flow path, and a valve 135 is installed at the connection pipe 123 to open and close the refrigerant flow path. Do. At this time, the valve 135 of the connecting pipe applies an ON / OFF valve that can open and close the refrigerant passage. Of course, a solenoid valve that can adjust the opening degree of the refrigerant passage may be applied. In addition, the valve 135 of the connecting pipe is installed at the connecting portion of the connecting pipe 123 and the second parallel pipe 122, the refrigerant passing through the first heating device 131 connecting pipe 123 And a three way valve selectively switching to the second and second parallel pipes 122.

In addition, it is preferable that a second heating device 132 for heating the refrigerant by hot water is installed in the first parallel pipe 121 between the outdoor heat exchanger 114 and the compressor 111. In addition, it is preferable that a third heating device 133 for heating the refrigerant by hot water is installed in the refrigerant pipe 124 between the compressor 111 and the indoor heat exchanger 112.

In addition, it is preferable that the temperature sensing means 131a, 132a, and 133a are provided on the refrigerant discharge side of the first, second, and third heating devices 131, 132, and 133, respectively. In addition, only one or two of the first, second and third heating devices may be provided with a temperature sensing means. For example, the temperature sensing means is installed only in the first heating device 131, the second heating device 132, or the third heating device 133, or the first and second heating devices, the second and third heating devices, or the third heating device. It can only be installed in 1, 3 heating devices

The first, second, and third heating devices 131, 132, and 133 may be formed in a structure in which hot water flows to form heat conduction fins on the outer surface of the refrigerant pipe, and heat exchange with heat conduction fins of the refrigerant pipe. In addition, the refrigerant pipe and the hot water pipe can be implemented in the form of a double pipe. In the double pipe structure, the flow directions of the refrigerant and the hot water may be the same or opposite. In terms of heat exchange efficiency, however, it is preferable that the flow directions of the refrigerant and the hot water are reversed. Such a heating device can be changed into various forms as long as the refrigerant and hot water are in thermal contact.

In addition, the first, second, third heating devices (131, 132, 133) have an independent hot water flow path as shown in Figure 1a. At this time, valves (131b, 132b, 133b) are respectively installed in the hot water flow path. Therefore, when the coolant temperature of each heater is lower than that of the hot water, hot water is supplied to the heater, otherwise the hot water is shut off.

Also, as shown in FIG. 1B, at least two or more heating devices among the first, second, and third heating devices 131, 132, and 133 may have hot water flow paths connected to each other. At this time, the hot water flow passage is preferably connected to the first via the most required heating device for heating the refrigerant during the heating operation.

The operation of the above-described heating and cooling system will be described with reference to FIG. 1A.

When the heating operation is started, the refrigerant flows in the dotted line in Fig. 1A.

That is, the refrigerant compressed by the compressor 111 flows into the third heating device 133. At this time, in the third heating device 133, the hot water is introduced only when it is determined that the temperature of the refrigerant is out of the temperature range preset by the controller. Accordingly, when the temperature of the refrigerant is low, the temperature of the refrigerant is increased, and when the temperature of the refrigerant is high, the temperature of the refrigerant is lowered, so that the temperature of the refrigerant discharged from the compressor 111 can be maintained within a predetermined range. do.

The refrigerant of the third heating device 133 flows into the indoor heat exchanger 112 and condenses. At this time, the indoor heat exchanger 112 heats the indoor space as it is heat-exchanged with the indoor air.

The refrigerant of the indoor heat exchanger 112 is expanded in the expansion device 113 and then flows into the second parallel tube 122. The refrigerant of the second parallel tube 122 is heated while passing through the first heating device 131 to be in a gas phase in a two phase state. The refrigerant of the second parallel pipe 122 is introduced into the compressor 111 again. At this time, since the refrigerant flowing into the compressor 111 is a gaseous refrigerant having a higher temperature than the expanded refrigerant, the compression work of the compressor is reduced.

While this heating operation is continued for a predetermined time, the outdoor heat exchanger 114 is exposed to the outside air. At this time, when the outdoor temperature is very low (about −15 ° C. or less), frost is frozen on the surface of the outdoor heat exchanger 114. Therefore, defrosting to melt frost must be performed.

When the defrosting operation is started, the refrigerant flows in the solid direction of FIG. 1A.

That is, the control unit opens the valve 135 of the connecting pipe. The expansion refrigerant introduced into the second parallel pipe 122 is heat-exchanged with the hot water in the first heating device 131 and then branched into the connection pipe 123 and the second parallel pipe 122. At this time, some of the expansion refrigerant melts the frost while passing through the outdoor heat exchanger 114, is heated in the second heating device 132, and then the compressor is introduced. In addition, some of the expansion refrigerant is introduced into the compressor through the second parallel tube 9922. Therefore, the compression work of the compressor is reduced by supplying a relatively high temperature refrigerant to the compressor 111. Further, by performing the defrosting operation simultaneously with the heating operation, the continuous heating operation can be executed.

On the other hand, although not shown in the case of the cooling operation, the refrigerant compressed by the compressor 111 is introduced into the first parallel tube 121. The refrigerant of the first parallel tube 121 is sequentially passed through the second heating device 132 and the outdoor heat exchanger 114 to be introduced into the expansion device 113. The refrigerant expanded in the expansion device 113 is introduced into the compressor 111 through the indoor heat exchanger 112 and the third heating device 133.

2A, a second embodiment of a cooling and heating system according to the present invention will be described.

The second embodiment is characterized in that the bypass tube 141 is further installed in the first embodiment.

That is, in the air conditioning system, the compressor 111, the indoor heat exchanger 112, the expansion device 113, and the outdoor heat exchanger 114 are sequentially connected by a refrigerant pipe. The refrigerant pipe between the expansion device 113 and the compressor 111 is composed of first and second parallel pipes 121 and 122. In this case, an outdoor heat exchanger 114 is installed in the first parallel tube 121, and a first heating device 131 is installed in the second parallel tube 122. In addition, a connecting pipe 123 is installed to connect the first and second parallel pipes 121 and 122, and a valve 135 is installed at the connecting pipe 123. In addition, a third heating device 133 is installed in the refrigerant pipe 124 between the compressor 111 and the indoor heat exchanger 112. At this time, the temperature sensing means (131a, 132a, 133a) is installed on the refrigerant discharge side of the first, second, third heating devices (131, 132, 133). Since these components are substantially the same as described above in the first embodiment, detailed descriptions of these components will be omitted.

At this time, the bypass pipe 141 is connected to the refrigerant pipe 125 between the expansion device 113 and the indoor heat exchanger 112 and the refrigerant pipe between the compressor 111 and the outdoor heat exchanger 114. . The bypass pipe 141 is preferably provided with a fourth heating device 134 for heating the refrigerant by hot water. Here, the fourth heating device 134 heats the bypassed refrigerant to perform the function of introducing the refrigerant in the gaseous state into the compressor 111.

In addition, the bypass pipe 141 is preferably provided with a check valve 142 that is opened when the pressure of the refrigerant is above a predetermined pressure. In this case, when the compressor 111 compresses the refrigerant in two stages, the check valve 142 is opened by the pressure of the primary compressed refrigerant, and a part of the primary compressed refrigerant opens the bypass pipe 141. Through the compressor 111 is introduced, the refrigerant of the compressor 111 is secondarily compressed. When the refrigerant is compressed in two stages, the compression efficiency is significantly increased.

The check valve 142 is more preferably installed on the refrigerant suction side of the fourth heating device (134). Of course, the check valve 142 may be installed on the refrigerant discharge side of the fourth heating device (134). However, when the check valve is installed on the refrigerant discharge side, the fourth heating device 134 may unnecessarily accumulate refrigerant in the fourth heating device 134 and may cause a refrigerant shortage. In order to fundamentally block the refrigerant shortage phenomenon, the check valve 142 is installed on the refrigerant suction side.

In addition, it is preferable that a temperature sensing means 134a is installed on the refrigerant discharge side of the fourth heating device 134. The temperature sensing means 134a determines the temperature of the refrigerant discharged from the fourth heating device 134 and controls the flow rate of the hot water according to the discharge temperature. For example, when the refrigerant temperature is low, a relatively large amount of hot water is supplied to the fourth heating device 134.

In addition, the first, second, third and fourth heating devices 131, 132, 133 and 141 may have independent hot water flow paths as shown in FIG. 2A. In this case, valves 131b, 132b, 133b, and 141b are installed in the hot water flow paths, respectively. Therefore, when the coolant temperature of each heater is lower than that of the hot water, hot water is supplied to the heater, otherwise the hot water is shut off.

Also, as shown in FIG. 2B, at least two or more heating devices among the first, second, third, and fourth heating devices 131, 132, 133, and 141 may have hot water flow paths connected to each other. At this time, the hot water flow passage is preferably connected to the first via the most required heating device for heating the refrigerant during the heating operation.

The operation of the second embodiment of the air-conditioning system described above will be described. The second embodiment is substantially the same as described in the first embodiment. That is, in the heating operation, the flow of the refrigerant flows in the dotted line direction in FIG. 2A and in the defrosting operation, the flow of the refrigerant flows in the solid line direction of FIG. 2A. A portion of the refrigerant primarily compressed by the compressor 111 as shown in 2c flows into the bypass pipe 141 to apply a predetermined pressure to the check valve 142. As the pressure opens the check valve 142, a part of the refrigerant flows into the fourth heating device 134 through the bypass pipe 141. As the refrigerant of the fourth heating device is heat-exchanged with hot water, the refrigerant becomes a gaseous refrigerant, and the gaseous refrigerant is compressed into the compressor 111 and then secondarily compressed. This two-stage compressed refrigerant flows through the system.

The control method of the above-described air conditioning system will be described.

If it is determined that hot water flows into the fourth heating device 134 during the heating operation, the hot water is supplied to the fourth heating device 134.

In the heating operation, when it is determined that the refrigerant sucked into the heating device (first, second, third, fourth heating device) is equal to or lower than the predetermined temperature set in the controller, the control unit supplies hot water to the heating device. The temperature of the corresponding heating apparatus should be appropriately set in consideration of the heating capacity and the refrigerant capacity.

3A, a third embodiment of a cooling and heating system according to the present invention will be described.

In the air conditioning system, the compressor 161, the indoor heat exchanger 162, the expansion device 163, and the outdoor heat exchanger 164 are sequentially connected by a refrigerant pipe, and heat exchange the flow refrigerant with hot water during the heating operation.

In this case, the refrigerant pipe between the expansion device 163 and the outdoor heat exchanger 164 is composed of first and second parallel pipes 171 and 172 connected in parallel, and the second parallel pipe 172 is supplied with refrigerant by hot water. A first heating device 181 for heating is installed. The second parallel tube is provided with a valve to control the refrigerant passage. Here, the valve applies an ON / OFF valve that can open and close the refrigerant passage. Of course, it is possible to apply a solenoid valve that can adjust the opening degree of the refrigerant passage. In addition, the valve is installed in the branched portions of the first and second parallel pipes 171 and 172, and the refrigerant passing through the expansion device 163 to the first parallel pipe 171 and the second parallel pipe 172. Optionally, three way valves may be employed.

In addition, it is preferable that a second heating device 172 for heating the refrigerant by hot water is installed in the refrigerant pipe between the outdoor heat exchanger 164 and the compressor 161. In addition, it is preferable that a third heating device 183 for heating the refrigerant by hot water is installed in the refrigerant pipe 174 between the compressor 161 and the indoor heat exchanger 162.

In addition, it is preferable that temperature sensing means 181a, 182a, and 183a are provided on the refrigerant discharge side of the first, second, and third heating devices 181, 182, and 183, respectively. In addition, only one or two of the first, second and third heating devices may be provided with a temperature sensing means. For example, the temperature sensing means is installed only in the first heating device 181, the second heating device 182, or the third heating device 183, or the first and second heating devices, the second and third heating devices, or the first heating device. It can only be installed in 1, 3 heating devices

Meanwhile, the first, second, third heating devices 181, 182, and 183 may have a structure in which hot water flows to form heat conduction fins on the outer surface of the refrigerant pipe and heat exchange with heat conduction fins of the refrigerant pipe. In addition, the refrigerant pipe and the hot water pipe can be implemented in the form of a double pipe. In the double pipe structure, the flow directions of the refrigerant and the hot water may be the same or opposite. In terms of heat exchange efficiency, however, it is preferable that the flow directions of the refrigerant and the hot water are reversed. Such a heating device can be changed into various forms as long as the refrigerant and hot water are in thermal contact.

In addition, the first, second, and third heating devices 181, 182, and 183 each have independent hot water flow paths as shown in FIG. 3A. In this case, valves 181b, 182b, and 183b are installed in the respective hot water flow passages. Therefore, when the coolant temperature of each heating device is lower than that of the hot water, it is preferable to supply hot water to the heating device, and to shut off the hot water.

In addition, as shown in FIG. 3B, at least two or more heating devices among the first, second, and third heating devices 181, 182, and 183 may have hot water flow paths connected to each other. At this time, the hot water flow passage is preferably connected to the first via the most required heating device for heating the refrigerant during the heating operation.

The operation of the above-described heating and cooling system will be described.

When the heating operation is started, the flow of the refrigerant flows in the dotted line in Fig. 3a.

That is, the refrigerant compressed by the compressor 161 flows into the third heating device 183. At this time, the third heating device 183 flows hot water only when it is determined that the temperature of the refrigerant is outside the temperature range preset by the controller. Accordingly, when the temperature of the refrigerant is low, the temperature of the refrigerant is increased, and when the temperature of the refrigerant is high, the temperature of the refrigerant is decreased, so that the temperature of the refrigerant discharged from the compressor 161 can be maintained within a predetermined range. do.

The refrigerant of the third heating device 183 flows into the indoor heat exchanger 162 to condense. At this time, the indoor heat exchanger 162 heats the indoor space as it heat-exchanges with the indoor air.

The refrigerant of the indoor heat exchanger 162 is expanded by the expansion device 163 and then flows into the first parallel tube 171. The refrigerant of the first parallel tube 171 is exchanged with outdoor air while passing through the outdoor heat exchanger 164. Subsequently, the refrigerant enters a gas phase in a two phase while passing through the second heating device 182, and the refrigerant flows back into the compressor 161. At this time, the refrigerant flowing into the compressor 161 is a gaseous refrigerant having a higher temperature than the expanded refrigerant, thereby reducing the compression work of the compressor.

While this heating operation is continued for a predetermined time, the outdoor heat exchanger 164 is exposed to the outside air. At this time, when the outdoor temperature is very low (about -15 ° C or less), since the low-temperature refrigerant is continuously introduced into the outdoor heat exchanger 164, frost is frozen on the surface. Therefore, defrosting to melt frost must be performed.

When the defrosting operation is started, the flow of the refrigerant flows in the solid line of FIG. 3A.

The control unit opens the valve 185 of the second parallel pipe 172. The expansion refrigerant introduced into the second parallel tube 172 is heat-exchanged with the hot water in the first heating device 181 and then flows into the outdoor heat exchanger 164. At this time, the expanded refrigerant is introduced into the second heating device 182 after melting the frost while passing through the outdoor heat exchanger (164). At the same time, the expansion refrigerant of the first parallel tube 171 is introduced into the second heating device 182 through the outdoor heat exchanger (164). The expansion refrigerant introduced into the second heating device 182 is heated and then flows into the compressor 161. Therefore, the compression work of the compressor 161 is reduced by supplying a relatively high temperature refrigerant to the compressor 161.

Meanwhile, in the cooling operation, the refrigerant compressed by the compressor 161 may include the second heating device 182, the outdoor heat exchanger, the expansion device 163, the indoor heat exchanger 162, and the third heating device 183. It flows into the compressor 161 sequentially.

4A, a fourth embodiment of a cooling and heating system according to the present invention will be described.

The fourth embodiment is characterized in that the bypass tube 191 is further installed in the third embodiment.

That is, in the air-conditioning system, the compressor 161, the indoor heat exchanger 162, the expansion device 163, and the outdoor heat exchanger 164 are sequentially connected by a refrigerant pipe. The refrigerant pipe between the expansion device 163 and the outdoor heat exchanger 164 includes first and second parallel pipes 171 and 172. In this case, a first heating device 181 is installed in the second parallel pipe 172. In addition, the second parallel pipe 172 is provided with a valve. In addition, a third heating device 183 is installed in the refrigerant pipe 174 between the compressor 161 and the indoor heat exchanger 162. At this time, the temperature sensing means (181a, 182a, 183a) is installed on the refrigerant discharge side of the first, second, third heating devices (181, 182, 183). In addition, valves 181b, 182b, and 183b are installed in the first, second, and third heating devices 181, 182, and 183. Since these components are substantially the same as described above in the third embodiment, detailed descriptions of these components will be omitted.

At this time, the bypass pipe 191 is connected to the refrigerant pipe 175 between the expansion device 163 and the indoor heat exchanger 163 and the refrigerant pipe between the compressor 161 and the outdoor heat exchanger 164. . The bypass pipe 191 is preferably provided with a fourth heating device 184 for heating the refrigerant by hot water. Here, the fourth heating device 184 heats the bypassed refrigerant to perform the function of introducing the refrigerant in the gaseous state into the compressor 161.

In addition, the bypass pipe 191 is preferably provided with a check valve 192 that is opened when the pressure of the refrigerant is above a predetermined pressure. In this case, when the compressor 161 compresses the refrigerant in two stages, the check valve 192 is opened by the pressure of the primary compressed refrigerant, and a part of the primary compressed refrigerant is configured to bypass the bypass pipe 191. Through the compressor 161 is introduced, the refrigerant of the compressor 161 is secondarily compressed. When the refrigerant is compressed in two stages, the compression efficiency is significantly increased.

The check valve 192 is more preferably installed on the refrigerant suction side of the fourth heating device (184). Of course, the check valve 192 may be installed on the refrigerant discharge side of the fourth heating device (194). However, when the check valve is installed on the refrigerant discharge side, the fourth heating device 184 may unnecessarily accumulate refrigerant in the fourth heating device 184 and may cause a refrigerant shortage. In order to fundamentally block the refrigerant shortage phenomenon, the check valve 192 is installed at the refrigerant suction side.

In addition, it is preferable that a temperature sensing means 184a is provided on the refrigerant discharge side of the fourth heating apparatus 184. The temperature sensing means 184a determines the temperature of the refrigerant discharged from the fourth heating device 184 and controls the flow rate of the hot water according to the discharge temperature. For example, when the refrigerant temperature is low, a relatively large amount of hot water is supplied to the fourth heating device 184.

In addition, the first, second, and third heating devices 181, 182, and 183 have independent hot water flow paths as shown in FIG. 4A. In this case, valves 181b, 182b, and 183b are installed in the respective hot water flow passages. Therefore, when the coolant temperature of each heating device is lower than that of the hot water, it is preferable to supply hot water to the heating device, and to shut off the hot water.

In addition, as shown in FIG. 4B, at least two or more heating devices among the first, second, and third heating devices 181, 182, and 183 may have hot water flow paths connected to each other. At this time, the hot water flow passage is preferably connected to the first via the most required heating device for heating the refrigerant during the heating operation.

The operation of the fourth embodiment of the above-described air conditioning and heating system will be described. In the fourth embodiment, the flow of the refrigerant during the heating operation is substantially the same as described in the third embodiment. That is, the flow of the refrigerant in the heating operation flows in the dotted line direction in FIG. 4A, and the flow of the refrigerant in the defrosting operation flows in the solid line direction in FIG. 4B. However, when the compressor 161 compresses the refrigerant in two stages during the heating operation, some of the refrigerant primarily compressed by the compressor flows into the bypass pipe 191 to apply a predetermined pressure to the check valve 192. . As the pressure opens the check valve, a portion of the refrigerant flows into the fourth heating device 184 through the bypass pipe 191 as shown in FIG. 4C. The refrigerant of the fourth heating apparatus 184 becomes a gaseous refrigerant as it is heat-exchanged with hot water, and the gaseous refrigerant is introduced into the compressor 161 and then secondarily compressed. The two stage pressure-reduced refrigerant flows through the entire system.

The control method of the above-described air conditioning system will be described.

When it is determined that hot water flows into the fourth heating device 184 during the heating operation, the hot water is supplied to the fourth heating device.

In the heating operation, when it is determined that the refrigerant sucked into the heating device (first, second, third, fourth heating device) is equal to or lower than the predetermined temperature set in the controller, the control unit supplies hot water to the heating device. The temperature of the corresponding heating apparatus should be appropriately set in consideration of the heating capacity and the refrigerant capacity.

 As described above, the air conditioning and heating system according to the present invention has the following effects.

First, according to the present invention, there is no need to provide a separate indoor unit for hot water heating, there is an effect that the maintenance and repair costs are reduced.

Second, according to the present invention, since the refrigerant flowing into the compressor is heated by hot water, it is possible to reduce the work of the compressor, it is possible to reduce the power consumption.

Third, according to the present invention, since the defrosting operation is performed at the same time as the heating operation, there is an effect that can implement a continuous heating operation.

Claims (44)

The compressor, the indoor heat exchanger, the expansion device and the outdoor heat exchanger are sequentially connected by the refrigerant pipe, and during the heating operation, the flowing refrigerant is exchanged with hot water on the refrigerant pipe. The refrigerant pipe between the expansion device and the compressor is composed of first and second parallel pipes connected in parallel, the first parallel pipe is provided with an outdoor heat exchanger, and the second parallel pipe is configured to heat the refrigerant by hot water. 1 Heating and cooling system, characterized in that the heating device is installed. delete delete The method of claim 1, Predetermined portions of the first and second parallel pipes are provided with connecting pipes for communicating the refrigerant passages. Cooling and heating system characterized in that the valve is installed to open and close the refrigerant passage. The method of claim 4, wherein The first parallel tube between the outdoor heat exchanger and the compressor, a second heating device for heating the refrigerant by hot water is installed. The method of claim 5, And a third heating device for heating the refrigerant by hot water in the refrigerant pipe between the compressor and the indoor heat exchanger. The method according to any one of claims 4 to 6, Cooling and heating system, characterized in that the temperature sensing means is installed on the refrigerant discharge side of the first heating device. The method of claim 7, wherein Cooling and heating system characterized in that the temperature sensing means is installed on the refrigerant discharge side of the second heating device and / and the third heating device. The method according to any one of claims 4 to 6, Cooling and heating system characterized in that the temperature sensing means is installed on the refrigerant discharge side of the second heating device and / and the third heating device. The method according to any one of claims 4 to 6, Bypass pipe is connected to the refrigerant pipe between the expansion device and the indoor heat exchanger, and the refrigerant pipe between the compressor and the outdoor heat exchanger, And the fourth heating device is installed in the bypass pipe to heat the refrigerant by hot water. The method of claim 10, The bypass pipe is provided with a check valve for opening when the pressure of the refrigerant is greater than the predetermined pressure. The method of claim 11, The check valve is a cooling and heating system, characterized in that installed on the refrigerant suction side of the fourth heating device. The method of claim 11, Cooling and heating system characterized in that the temperature sensing means is installed on the refrigerant discharge side of the fourth heating device. The method of claim 13, Cooling and heating system, characterized in that the temperature sensing means is installed on the refrigerant discharge side of the first heating device. The method of claim 14, Cooling and heating system characterized in that the temperature sensing means is installed on the refrigerant discharge side of the second heating device and / or the third heating device. The method of claim 13, Cooling and heating system characterized in that the temperature sensing means is installed on the refrigerant discharge side of the second heating device and / or the third heating device. The method of claim 10, Each heating device has an independent hot water flow path, characterized in that the heating and cooling system. The method of claim 10, At least two heating devices of the heating devices, the heating and cooling system, characterized in that the interconnected hot water. The control method of the air-conditioning and heating system according to claim 4, wherein the valve of the connecting pipe is opened and the hot water is supplied to the first heating device during the defrosting operation. The control method of the air-conditioning and heating system according to claim 10, wherein, in the heating operation, when it is determined that hot water is introduced into the fourth heating device, the hot water is supplied to the fourth heating device. The control method of the air-conditioning system according to claim 10, wherein during the heating operation, when the refrigerant sucked into the heating device is determined to be lower than or equal to the preset temperature in the control unit, hot water is supplied to the heating device. The compressor, the indoor heat exchanger, the expansion device and the outdoor heat exchanger are sequentially connected by the refrigerant pipe, and during the heating operation, the flowing refrigerant is exchanged with hot water on the refrigerant pipe. The refrigerant pipe between the expansion device and the outdoor heat exchanger is composed of first and second parallel pipes connected in parallel, The second parallel tube is a heating and heating system, characterized in that the first heating device for heating the refrigerant by hot water is installed. The method of claim 22, The second parallel tube is a heating and cooling system, characterized in that the valve is installed to open and close the refrigerant passage. The method of claim 23, wherein The valve is installed on the refrigerant suction side of the first heating device. The method of claim 24, And a second heating device for heating the refrigerant by hot water in the refrigerant pipe between the outdoor heat exchanger and the compressor. The method of claim 25, And a third heating device for heating the refrigerant by hot water in the refrigerant pipe between the compressor and the indoor heat exchanger. The method according to any one of claims 23 to 26, Cooling and heating system, characterized in that the temperature sensing means is installed on the refrigerant discharge side of the first heating device. The method of claim 27, Cooling and heating system characterized in that the temperature sensing means is installed on the refrigerant discharge side of the second heating device and / and the third heating device. The method according to any one of claims 23 to 26, Cooling and heating system, characterized in that the temperature sensing means is installed on the refrigerant discharge side of the second heating device. The method according to any one of claims 22 to 26, Bypass pipe is connected to the refrigerant pipe between the expansion device and the indoor unit, and the refrigerant pipe between the compressor and the outdoor heat exchanger, And the fourth heating device is installed in the bypass pipe to heat the refrigerant by hot water. The method of claim 30, The bypass pipe is provided with a check valve for opening when the pressure of the refrigerant is greater than the predetermined pressure. The method of claim 31, wherein The check valve is a cooling and heating system, characterized in that installed on the refrigerant suction side of the fourth heating device. 33. The method of claim 32, Cooling and heating system characterized in that the temperature sensing means is installed on the refrigerant discharge side of the fourth heating device. The method of claim 33, wherein Cooling and heating system, characterized in that the temperature sensing means is installed on the refrigerant discharge side of the first heating device. The method of claim 34, wherein Cooling and heating system characterized in that the temperature sensing means (131a) is installed on the refrigerant discharge side of the second heating device and / or the third heating device. The method of claim 33, wherein Cooling and heating system, characterized in that a temperature sensing means is installed on the second heating device and / or the refrigerant discharge side. The method of claim 30, Each heating device has an independent hot water flow path, characterized in that the heating and cooling system. The method of claim 30, At least two heating devices of the heating devices, the heating and cooling system, characterized in that the interconnected hot water. The control method of the cooling and heating system according to claim 23, wherein the defrosting operation opens the valve of the second parallel pipe and supplies hot water to the first heating device. The control method according to claim 30, wherein the hot water is supplied to the fourth heating device when it is determined that the hot water is introduced into the fourth heating device of the bypass pipe during the heating operation. The control method according to claim 30, wherein, during the heating operation, when the refrigerant sucked into the heating device is determined to be lower than or equal to the preset temperature in the control unit, hot water is supplied to the heating device. A compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are sequentially connected by a refrigerant pipe, and a bypass pipe is connected between the refrigerant pipe between the expansion device and the indoor unit and the compressor and the outdoor heat exchanger. The heating and heating system is characterized in that the heating device is installed to heat exchange the refrigerant with hot water. The method of claim 42, wherein The bypass pipe is installed in the cooling and heating system, characterized in that the check valve is opened when the pressure of the refrigerant is greater than the predetermined pressure. The method of claim 43, The check valve is a heating and cooling system, characterized in that installed on the refrigerant suction side of the heating device.

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