KR101198561B1 - Air conditioner using of the subterranean heat - Google Patents

Abstract

The present invention relates to an air conditioner using geothermal heat, and more particularly, to an air conditioner using geothermal heat in which a heat source by district heating is used.

The air conditioner using geothermal heat according to the present invention, at least one outdoor unit; And a plurality of indoor units connected to the outdoor unit by a pipe. A third heat exchanger connected to the outdoor unit and pipes and buried underground to exchange heat between the geothermal and circulating media; And a district heating unit supplying a heat source by district heating; An district heating heat exchanger in which at least one heat source, a circulating medium, and a refrigerant flowing in the district heating unit are heat-exchanged; And a cooling unit connected to the third heat exchanger and the pipe, for cooling the circulating medium. The district heating unit and the cooling unit are configured to be selectively operated. In addition, the district heating heat exchanger is configured to be connected to at least one of the indoor unit and the indoor space to provide a heat source to harmonize the indoor space. According to the air conditioner using the geothermal heat is configured as described above, there is an advantage that the stable cooling, heating is possible, there is an advantage that the convenience of using hot water for hot water supply is maximized.

Geothermal air conditioner, circulation media, district heating, district heating unit, district heating heat exchanger

Description

Air Conditioner using Geothermal Heater {Air conditioner using of the subterranean heat}

1 is an installation state showing an installation state of the air conditioner according to the prior art.

Figure 2 is a block diagram showing the configuration of an air conditioner according to the prior art.

Figure 3 is a state diagram of the air conditioner using geothermal heat employing a preferred embodiment of the present invention.

Figure 4 is a block diagram showing the configuration of an air conditioner using geothermal heat employing a preferred embodiment of the present invention.

Figure 5 is a block diagram showing the internal configuration of the outdoor unit of the air conditioner using geothermal heat employing a preferred embodiment of the present invention.

Figure 6 is a block diagram showing the flow of the circulation medium when using district heating of the air conditioner using geothermal heat employing a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100. Indoor unit 110. First heat exchanger

120. Indoor expansion valve 130. Common liquid pipe

132. Branching pipes 140. Common institutions

142. Branch engine 200. Outdoor unit

210. Constant Speed Compressor 210 '. Inverter Compressor

212.Bactericidal pipe 213.Oil separator

214. Oil return pipe 215. Check valve

216. Hot gas pipe 217. Hot gas valve

220. Accumulator 230. Main refrigerant valve

240. Second heat exchanger 250. Supercooler

260. Dryer 300. Third heat exchanger

310. Circulation piping 312. Supply piping

314. Recovery piping 320. Circulation pump

330. Replenishment tanks 340. Preservation tanks

400. Hot water pump 500. Hot water tank

600. District Heating Unit 610. District Heating Heat Exchanger

The present invention relates to an air conditioner using geothermal heat, and more particularly, to an air conditioner using geothermal heat in which a heat source by district heating is used.

In general, the air conditioning system is a system that cools or heats air in an indoor space such as an office or a house so that the indoor space is kept comfortable, and constitutes a series of refrigerant cycles including compression, condensation, expansion, and evaporation. Such an air conditioning system heat-exchanges refrigerant and air to harmonize air in a desired space.

In recent years, the HVAC system not only harmonizes the air in response to the improvement of quality of life, but also purifies and pollutes the polluted air in the indoor space, and cleans the air back into the indoor space. Additional features are being added, such as a dehumidification function that re-enters the air into the interior space.

As the air conditioner is known, the air conditioner is divided into a separate type air conditioner in which the indoor unit and the outdoor unit are separately installed, and an integrated air conditioner in which the indoor unit and the outdoor unit are integrally installed. This is the preferred trend.

In the separate air conditioner, the refrigerant compressed by the compressor flows to the indoor unit and the outdoor unit by a main refrigerant valve that changes the flow direction of the refrigerant according to heating and cooling operations, and the refrigerant circulating between the indoor unit and the indoor unit is heat exchanged. The indoor space is cooled or heated.

That is, when an air conditioner performs a cooling operation, the refrigerant compressed by the compressor is heat-exchanged with the outside air in the outdoor unit, cooled, and then flows to the indoor unit so that the cooled refrigerant heat-exchanges with the air in the indoor space. It is cooled. The refrigerant exchanged with the air in the indoor space flows to the outdoor unit, thereby forming a cycle.

In addition, when the air conditioner is heated, the refrigerant compressed by the compressor flows to the indoor unit by the main refrigerant valve, and the refrigerant flowing into the indoor unit heats the indoor space while heat-exchanging with the air in the indoor space. do. The refrigerant exchanged with the air in the indoor space flows to the outdoor unit, thereby forming a cycle.

However, according to the prior art configured as described above, the following problems occur.

The temperature of the outside air heat-exchanged with the refrigerant in the indoor unit is formed too low in the heating operation, and is formed too high in the cooling operation. Therefore, a problem arises in that a lot of energy is consumed during the heat exchange of the refrigerant.

As a lot of energy is consumed during the heat exchange of the refrigerant, a problem that takes a long time to heat exchange the refrigerant to a certain temperature also occurs.

In addition, since the air temperature of the external space that is heat-exchanged with the refrigerant is not constant, the refrigerant that is heat-exchanged with the air of the external space cannot maintain a constant temperature, which makes it difficult to stabilize air.

Therefore, a problem arises in that reliable and stable cooling and heating become difficult.

In addition, the temperature of the refrigerant to be heat exchanged is not kept constant so that the problem of not maintaining a constant temperature of the hot water for hot water supply occurs.

By not maintaining a constant temperature of the hot water for hot water supply, there is a problem in which the user's damage is caused by the use of hot water.

The purpose of the air conditioner using geothermal heat according to the present invention for solving the above problems is to provide an air conditioner using geothermal heat is provided with a district heating source unit capable of stable heating.

An air conditioner using geothermal heat according to the present invention for achieving the above object, at least one outdoor unit having a second heat exchanger through which the refrigerant can flow; A plurality of indoor units connected by the outdoor unit and a pipe, each having a first heat exchanger; A third heat exchanger connected to the outdoor unit by pipes and buried underground to exchange heat between the geothermal and circulating media, and wherein the circulating medium exchanges heat with the refrigerant in the second heat exchanger; District heating unit for supplying heat source by district heating; And a district heating heat exchanger connected to the first heat exchanger and the second heat exchanger independently so that the hot water heated by the heat source by the district heating exchanges the circulation medium, and the hot water and the refrigerant exchange heat. do.

The district heating unit and the cooling unit are configured to be selectively operated.

The district heating heat exchanger is configured to be connected to at least one of the indoor unit and the indoor space to provide a heat source that harmonizes the indoor space.

The district heating heat exchanger is connected to the third heat exchanger and configured to heat exchange the circulating medium introduced from the third heat exchanger.

The district heating heat exchanger is configured to supply a heat source for maintaining hot water for hot water supply at a set temperature.

According to the air conditioner using the geothermal heat is configured as described above there is an advantage that more stable cooling, heating is possible, there is an advantage that the convenience of using hot water for hot water supply is maximized.

Recently, in the air conditioning system, research and development on the air conditioning system using geothermal heat provided while maintaining a constant temperature at a certain depth in the basement has been actively conducted. The air conditioner using such geothermal heat is environmentally friendly, and has many advantages such as energy consumption efficiency improvement, size reduction, noise reduction, and air conditioning efficiency, and is being installed in large buildings and large apartments.

In addition, research and development of air conditioning systems using waste heat generated in power plants and waste incinerators are being actively conducted. As such, the air conditioning system using waste heat is expected to be spotlighted as an environmentally friendly and future-oriented air conditioning system in order to save energy and improve the efficiency of power plants and waste incinerators in terms of effective use of energy.

Hereinafter, a representative embodiment of an air conditioner using geothermal heat according to the present invention will be described with reference to the accompanying drawings.

Figure 1 is an installation state diagram showing the installation state of the air conditioner using geothermal heat employing a preferred embodiment according to the present invention, Figure 2 is an air conditioner using geothermal air employing a preferred embodiment according to the present invention A block diagram showing the configuration of is shown.

First, referring to FIG. 1, a state in which an air conditioner using geothermal heat according to the present invention is installed will be described. In the air conditioner using geothermal heat according to the present invention, a plurality of indoor units installed in an indoor space to harmonize air in an indoor space ( 100) is installed in the outdoor space is connected to the outdoor unit 200, the outdoor unit 200 and the piping connected to the indoor unit 100, the pipe is connected to the outdoor unit 200, the underground is buried to a certain depth underground heat and circulating medium heat exchange A third heat exchanger 300 is provided.

In the pipe connected between the indoor unit 100 and the outdoor unit 200, the refrigerant flows to exchange heat with the air in the indoor space to harmonize the indoor space, and between the outdoor unit 200 and the third heat exchanger 300. While the circulating medium is flowing it is heat exchanged with the refrigerant flowing in the indoor unit 100, and the heat exchange with the geothermal heat while passing through the third heat exchanger 300 buried underground.

In addition, a plurality of auxiliary heat sources are installed between the outdoor unit 200 and the third heat exchanger 300 to assist heat exchange between the outdoor unit 200 and the third heat exchanger 300. A boiler is installed in the auxiliary heat source, and the boiler is connected to a pipe for guiding the movement of the circulating medium from the third heat exchanger 300 to the outdoor unit 200. Therefore, a refrigerant flows between the indoor unit 100 and the outdoor unit 200, and a circulating medium flows between the outdoor unit 200 and the third heat exchanger 300 and between the third heat exchanger 300 and the auxiliary heat source. .

In addition, a hot water supply system is configured between the outdoor unit 200 and the third heat exchanger 300 to maintain hot water for hot water at a set temperature. Such a hot water supply system is operated in conjunction with an air conditioner using geothermal heat, and is operated separately from an air conditioner using geothermal heat to provide hot water for hot water supply at a constant temperature.

Looking at the hot water supply system, the heat pump 400 for hot water and the hot water for hot water connected to the pipe guiding the circulation medium between the outdoor unit 200 and the third heat exchanger 300 to exchange heat between the circulation medium and the refrigerant; It is configured to include a hot water tank 500 is stored.

A circulation medium flows between the hot water supply pump 400 and the hot water tank 500 to exchange heat with the hot water refrigerant. That is, the circulating medium that flows into the hot water heat pump 400 is heat-exchanged with the refrigerant circulated in the hot water heat pump 400, and the heat-exchanged refrigerant is again heated with the hot water pump 400 for hot water. Heat exchange with the circulation medium that flows between the tank (500).

The circulating medium heat-exchanged with the hot water refrigerant in the hot water heat pump 400 exchanges heat with the hot water for hot water stored in the hot water tank 500 to maintain the hot water for hot water at a constant temperature.

Looking at the air conditioner using geothermal heat in more detail with reference to Figure 4, the interior of the indoor unit 100 is equipped with a first heat exchanger (110) for heat exchange between the air and the refrigerant in the indoor space. In the indoor unit 100, the refrigerant flowing inside and the air in the indoor space are heat-exchanged, and the heat-exchanged air is discharged into the indoor space to harmonize the indoor space.

An indoor expansion valve 120 is provided on the side of the first heat exchanger 110. The indoor expansion valve 120 lowers the temperature and pressure of the refrigerant by expanding the refrigerant flowing into the first heat exchanger 110, and expands the refrigerant flowing out of the first heat exchanger 110, thereby expanding the refrigerant. This will lower the pressure.

Inside the outdoor unit 100, a plurality of compressors 210 and 210 ′ compressing a refrigerant, which is a working fluid, to high temperature and high pressure, and a refrigerant in a gas state among the refrigerants introduced into the compressors 210 and 210 ′ are filtered out. Accumulator 220 to flow to the main, the main refrigerant valve 230 to switch the flow direction of the refrigerant compressed in the compressor (210, 210 ') during the cooling operation and heating operation, the second heat exchanger 240 in which the refrigerant and the circulating medium heat exchange ) Is mounted.

The compressor (210, 210 ') is composed of a constant speed compressor 210 to operate at a constant speed at a constant speed and an inverter compressor 210' to perform a variable speed drive according to the load capacity. Therefore, when the load capacity required during operation of the air conditioning system is small, the inverter compressor 210 'is first operated, and when the load capacity of the inverter compressor 210' is exceeded, the constant speed compressor 210 is operated. .

The outdoor unit 200 is connected to the plurality of indoor units 100 by a pipe. The pipe includes a common liquid pipe 130 through which a liquid refrigerant flows between the indoor unit 100 and the outdoor unit 200, and a gaseous state. It is composed of a common engine 140 through which the refrigerant flows, the common liquid pipe 130 is branched from the common liquid pipe 130 so that the branch liquid pipe 132 for guiding the flow of the refrigerant to each indoor unit 100 is in communication with each other. The branch engine 142 is branched from the common engine 140 to the common engine 140 so as to communicate with the branch engine 142 for guiding the flow of the refrigerant to each indoor unit 100.

The diameters of the branch pipe 132 and the branch pipe 142 are different depending on the capacity of the indoor unit 100, that is, the size of the indoor space for air conditioning or the amount of air conditioning required in the indoor space for air conditioning. Molded.

The third heat exchanger 300 is formed so that the circulation medium which is buried at a predetermined depth in the basement to flow inside the heat exchange with the geothermal heat, and is connected to the second heat exchanger 240 by a pipe. That is, between the second heat exchanger 240 and the third heat exchanger 300 is connected to the circulation pipe 310 for guiding the circulation of the circulation medium, the circulation medium guided by the circulation pipe 310 is at least Materials having a higher specific heat than air are used, and water is preferably used for such a circulation medium.

The circulation pipe 310 is equipped with a circulation pump 320 so that the circulation medium flows with a constant pressure and speed, and the circulation medium in one direction by the circulation pump 320 operated by the application of an external power source. It is flowed along the circulation pipe 310 while maintaining a constant pressure and speed.

Accordingly, the circulation medium flowing through the inside of the circulation pipe 310 forms a cycle while flowing in one direction, and has the second pressure exchanger 240 and the third heat exchanger 240 having a constant pressure and speed. 300 flows between the refrigerant and the circulation medium in the second heat exchanger 240, and the heat exchange between the geothermal heat and the circulation medium occurs in the third heat exchanger 300. .

The circulation pipe 310 is fastened so as to communicate with the replenishment tank 330 to compensate for the shortage of the circulation medium, and the pressure of the circulation medium which flows inside the circulation pipe 310 at the side of the replenishment tank 330. The storage tank 340 for adjusting the fastening is communicated with the circulation pipe (310).

The replenishment tank 330 is a circulating medium storage device for supplying a circulating medium to the circulation pipe 310. That is, the replenishment tank 330 is provided to replenish the circulation medium shortened by evaporation or leakage while passing through the circulation pipe 310, and the storage tank 340 is instantaneously changed in the circulation pipe 310. It is a buffer area for adjusting the pressure of the internal circulation medium.

The circulation pipe 310 is provided so as to communicate with the boiler to directly heat the circulation medium to prevent freezing of the circulation medium. In addition to these boilers it is possible to be equipped with a variety of auxiliary heat sources as needed.

The air conditioner using geothermal heat is provided with a third heat exchanger (300). The third heat exchanger 300 is buried underground to provide heat exchange between the heat in the ground and the circulation medium that flows inside the circulation pipe 310. The third heat exchanger 300 is buried deep in the basement. In general, it is preferable to be buried between 1m to 200m underground, it is preferable to be buried in a depth that can always maintain the yearly average temperature of the buried region according to the climate of the region where the third heat exchanger 300 is buried. Or the depth of burial depends on the geological structure.

The third heat exchanger 300 may be provided in plural, and may be bent a plurality of times as illustrated to form a zigzag shape. The geothermal heat and the circulating medium exchange heat while flowing in the zigzag third heat exchanger 300. The circulation pipe 310 is connected between the third heat exchanger 300 and the second heat exchanger 240, and the heat exchange medium flows along the circulation pipe 310.

The circulation pipe 310 has a supply pipe 312 for guiding the circulating medium to be introduced into the third heat exchanger 300, and a circulating medium that exchanges heat with the ground heat while passing through the third heat exchanger 300. It is composed of a recovery pipe 314 for guiding the recovery to the second heat exchanger (240).

On the other hand, in the air conditioner using geothermal heat according to the present invention is provided with a district heating unit 600 for providing a district heating heat source.

First, when looking at district heating, district heating generates hot water using waste heat generated from power plants or waste incinerators, and then supplies the generated hot water to supply energy.

That is, water evaporates to water vapor at 100 ° C., but when heated in an enclosed space, the water maintains the state of the fluid while having a temperature of 110 ° C. or more. Water formed in this state is called warm water. In this way, the district heating heat exchanger is installed near the space where energy is needed for the hot water that maintains the fluid state while maintaining a high temperature, that is, in the vicinity of the apartments, large malls, skyscrapers, etc. To flow.

The hot water flowing into the district heating heat exchanger provides energy to the refrigerant or the circulating medium while exchanging heat with the refrigerant or the circulating medium flowing into the district heating heat exchanger via the district heating heat exchanger.

Heavy hot water, which provides energy to the refrigerant or the circulating medium, flows back to a power plant or a waste incineration plant to form a cycle. As such, the circulated heavy hot water is supplied with energy generated from a power plant and a waste incinerator to provide energy to a refrigerant or a circulating medium in the district heating heat exchanger, and then recovered to a power plant or waste incinerator.

In such district heating, hot water is used as a heat source, which is safe to use, has low noise, and enables continuous heating throughout the year, thereby maintaining a comfortable temperature for 24 hours. In addition, the efficiency of the power plant is improved, there are many advantages, such as the use of waste heat is a variety of fuel can be used, environmentally friendly, energy consumption is reduced.

The district heating heat exchanger (610) in which the hot water supplied from the district heating unit (600) is heat-exchanged is connected to the indoor unit (100) by piping to heat the refrigerant that flows through the first heat exchanger (110) to the refrigerant. The energy supplying the energy, the refrigerant to supply the energy is heat-exchanged with the air in the indoor space in the first heat exchanger 110 to provide energy to the air in the indoor space.

The air of the indoor space, which is supplied with energy, heats the indoor space, and the refrigerant that provides energy to the air of the indoor space flows to the district heating heat exchanger 610 again and flows from the district heating unit 600 to the district heating heat exchanger. Heat is exchanged with hot water flowing to 610 to receive energy.

In addition, the hot water heat pump 400 is connected to the district heating heat exchanger 610 by a pipe. The district heating heat exchanger 610 connected to the hot water heat pump 400 is connected to the pipe between the hot water heat pump 400 and the hot water tank 500 to heat the hot water for hot water.

In the case of a heat source using district heating, continuous supply is possible, so that even if the air conditioner using geothermal heat does not operate, continuous heating of hot water for hot water supply is possible. That is, a pipe for guiding circulation of the circulating medium is connected to the district heating heat exchanger 610 between the hot water supply pump 400 and the hot water tank 500.

The circulation medium circulated between the hot water supply pump 400 and the hot water tank 500 flows to the district heating heat exchanger 610 when the air conditioner using geothermal heat does not operate. The circulating medium flowing into the district heating heat exchanger (610) is introduced into the hot water generated in the district heating unit 600, the hot water and the circulation medium is heat-exchanged to provide the energy of the hot water to the circulation medium.

The circulation medium which receives energy from the hot water while passing through the district heating heat exchanger 610 flows into the internal space of the hot water tank 500 and exchanges heat with hot water for hot water stored in the hot water tank 500. And supply the heat exchanged circulating medium again to the district heating heat exchanger (610).

The hot water circulating medium flowing to the district heating heat exchanger 610 exchanges heat with hot water flowing through the district heating unit 600 while receiving energy through the district heating heat exchanger 610.

As such, the hot water circulating medium supplied with energy from the district heating heat exchanger 610 continuously heat exchanges with the hot water for hot water stored in the hot water tank 500 while the hot water is stored in the hot water tank 500. It is possible to maintain the hot water at the set temperature.

In addition, the hot water circulating medium passing through the district heating heat exchanger 610 is supplied with energy by hot water flowing from the district heating unit 600 to the district heating heat exchanger 610, and the hot water supply tank 500. Heat exchange with the hot water for hot water stored in the to provide energy to the hot water for hot water supply.

Therefore, regardless of the operation of the air conditioner using the geothermal heat it is possible to maintain the hot water for hot water stored in the hot water tank 500 at a set temperature.

3 is a block diagram showing the internal configuration of the outdoor unit of the air conditioner using geothermal heat employing a preferred embodiment of the present invention. Looking at the internal configuration of the outdoor unit 200 according to the figure, a plurality of compressors (210, 210 ') are mounted inside the outdoor unit (200). The compressors 210 and 210 'serve to compress the refrigerant to a high temperature and high pressure.

The compressors 210 and 210 'are mainly used in a scroll compressor having good compression efficiency and low noise, and are formed in a cylindrical shape having a predetermined diameter. A coolant injector 211 is provided at the inlet side of the compressors 210 and 210 ', and the coolant injector 211 has a low temperature refrigerant when the internal temperature of the compressors 210 and 210' is increased according to the operating conditions of the compressors 210 and 210 '. Spraying to cool the inside of the compressor (210, 210 ').

The refrigerant injected by the refrigerant injector 211 to the compressors 210 and 210 'is preferably used as the supercooled refrigerant passes through the subcooler 250 to be described later.

A constant oil compressor 212 is provided between the constant speed compressor 210 and the inverter compressor 210 'such that the constant speed compressor 210 and the inverter compressor 210' communicate with each other. When oil supply shortage occurs in one compressor by the fungal oil pipe 212, oil is replenished from another compressor to prevent damage to the compressors 210 and 210 ′ due to oil shortage.

An oil separator 213 for separating oil contained in the refrigerant discharged from the compressors 210 and 210 'is mounted at an outlet side of the compressors 210 and 210' and discharged from the compressors 210 and 210 'by the oil separator 213. Oil contained in the refrigerant contained in the refrigerant and discharged to the outlet side of the compressors 210 and 210 'is separated by the oil separator 213.

The oil separator 213 is equipped with an oil return pipe 214 for guiding oil separated from the oil separator 213 to be recovered to the compressors 210 and 210 '. That is, the refrigerant compressed in the compressors 210 and 210 'passes through the oil separator 213, and oil contained in the refrigerant is separated, and the separated oil is recovered to the compressors 210 and 210' through the oil recovery pipe 214. do.

In other words, when the compressors 210 and 210 'are operated, oil is used to cool the frictional heat generated by the compressors 210 and 210', and the oil used is the outlet of the compressors 210 and 210 'together with the refrigerant compressed to high temperature and high pressure. Discharged. The refrigerant and oil discharged to the outlets of the compressors 210 and 210 'pass through the oil separator 213 to separate the refrigerant and the oil.

The oil separated from the refrigerant while passing through the oil separator 213 is guided by the oil recovery pipe 214 to be recovered into the compressors 210 and 210 'so that the oil recovered into the compressors 210 and 210' is returned. In order to cool the frictional heat of the compressors 210 and 210 'inside the compressors 210 and 210'.

The check valve 215 is mounted on the outlet side of the oil separator 213. When only one of the compressors 210 and 210 'is operated, the check valve 215 prevents the refrigerant discharged from the operated compressor from flowing back to the non-operated compressor.

The outlet side of the oil separator 213 is formed to communicate with one port of the main refrigerant valve 230 which is a four-way valve. The main refrigerant valve 230 is arranged to change the flow direction of the refrigerant according to the operation of the air conditioning system, each port is the outlet side of the oil separator 213, the accumulator 220, the second heat exchanger 240 ), Is connected to the first heat exchanger (110).

That is, the refrigerant compressed to high temperature and high pressure by the constant speed compressor 210 and the inverter compressor 210 ′ is separated from the oil while passing through the oil separator 213, and the refrigerant passed through the oil separator 213 is one. Joined by a pipe and then flows into the main refrigerant valve 230.

In the pipe flowing through the oil separator 213 and introduced into the main refrigerant valve 230, some of the refrigerant compressed to high temperature and high pressure in the compressors 210 and 210 ′ do not pass through the main refrigerant valve 230. The hot gas pipe 216 is formed to communicate with the inlet side of the accumulator 220 across the main refrigerant valve 230 to be introduced into the accumulator 220.

When the hot gas pipe 216 needs to increase the pressure of the refrigerant flowing into the accumulator 220, the hot gas pipe 216 may directly supply the high pressure refrigerant discharged from the compressors 210 and 210 ′ to the inlet side of the accumulator 220. Is formed. The hot gas pipe 216 is equipped with a hot gas valve 217 that is a bypass valve to selectively open and close the hot gas pipe 216.

A subcooler 250 for supercooling a refrigerant is mounted on a pipe formed outside the outdoor unit 200 in the second heat exchanger 240. The supercooler 250 is a subcooling means for cooling the heat exchanged refrigerant while passing through the second heat exchanger 240 when the air conditioner using geothermal heat is cooled, and the outlet side of the second heat exchanger 240. It is formed at any position of the pipe connected to the.

The refrigerant that is connected to the second heat exchanger 240 and flows along the pipe to the first heat exchanger 110 is cooled while a part thereof is expanded. The refrigerant to be cooled exchanges heat with the refrigerant flowing through the inside of the pipe while refluxing the outside of the pipe to supercool the refrigerant flowing inside the pipe.

The dryer 260 is mounted on the side of the subcooler 250. The dryer 260 plays a role of removing water contained in the refrigerant that is supercooled while passing through the subcooler 250.

The accumulator 220 is installed between the constant speed compressor 210 and the inverter compressor 210 ′ to separate the liquid refrigerant and the gas refrigerant. The accumulator 220 separates the refrigerant remaining in a liquid state from the refrigerant flowing into the compressors 210 and 210 'from the gaseous refrigerant and separates the refrigerant in the gas state into the compressors 210 and 210'. To get into

This is because when the refrigerant remaining in the liquid state without being evaporated in the gas state among the refrigerant flowing into the compressors 210 and 210 'is directly introduced into the compressors 210 and 210', the load of the compressors 210 and 210 'is increased, thereby increasing the load of the compressor. (210, 210 ') will cause damage.

Therefore, in order to prevent damage to the compressors 210 and 210 ', the refrigerant that is not evaporated and remaining in the liquid phase is separated from the refrigerant flowing into the accumulator 220 so that only the refrigerant in the gas state of the compressors 210 and 210' is removed. Allow it to enter inside.

Since the refrigerant remaining in the liquid state in the accumulator 220 is relatively heavy than the refrigerant in the gas state, only the gaseous refrigerant stored in the lower portion of the accumulator 220 and positioned above the liquid refrigerant in the liquid state will be described above. It flows into the compressors 210 and 210 '.

The second heat exchanger 240 is provided inside the outdoor unit 200. The second heat exchanger 240 is molded into a water-cooled heat exchanger to exchange heat between the refrigerant and the circulating medium. The second heat exchanger 240 is positioned so that a plurality of thin plates at predetermined intervals, and the refrigerant and the circulating medium alternately flow in the space between the thin plates and the thin plates.

That is, when the refrigerant flows in the space between the thin plate and the thin plate, the circulating medium flows between the thin plate through which the refrigerant flows and the next thin plate, and the refrigerant flows between the thin plate through which the circulating medium flows and the next thin plate. will be. As such, the refrigerant and the circulation medium flowing between the thin plates and the thin plates flow in a direction corresponding to each other.

As such, the coolant and the circulating medium flow between the thin plate and the thin plate in a direction corresponding to each other, and heat exchange occurs between the coolant and the circulating medium.

On the other hand, a cooling unit 500 'is installed on the roof of a building in which an air conditioner using geothermal heat is installed. The cooling unit 500 ′ cools the water supplied from the outside to generate cooling water, and then heats the cooling water with the circulation medium flowing along the recovery pipe 314 to flow along the recovery pipe 314. The energy of the circulating medium is absorbed to cool the circulating medium.

The cooling unit 500 'receives water from the outside to cool the supplied water to form cooling water. The cooling unit 500 ′ cools the water by directly contacting the water with air.

That is, when water comes into contact with cold air, part of the water is evaporated, and the evaporated water cools the temperature of the surrounding water to receive energy. By using this phenomenon, the cooling unit 500 'flows water from above to downward, and injects air from the lower end to cool the water.

The water cooled in the cooling unit 500 'is heat-exchanged with the circulating medium flowing into the recovery pipe 314, or when the circulating medium is water, it is joined with the circulating medium to lower the overall temperature of the circulating medium.

The flow rate of the circulation medium flowing into the cooling unit 500 'is controlled by a three-way valve mounted to the recovery pipe 314. The circulating medium cooled by the cooling unit 500 ′ flows into the second heat exchanger 240 to exchange heat with the refrigerant via the second heat exchanger 240.

The refrigerant is cooled by the circulating medium passing through the second heat exchanger 240, and the cooled refrigerant is supercooled while passing through the subcooler 250 to flow to the indoor unit 100. Heat exchange with the indoor air via the first heat exchanger (110). By the refrigerant that is heat-exchanged with the indoor air, the indoor space harmonizes the indoor space to the temperature desired by the user.

That is, the cooling unit 500 'is a cooling unit 500 while controlling the opening degree of the three-way valve mounted on the recovery pipe 314 when the air conditioner using geothermal heat is cooled to cool the indoor space. It is responsible for cooling the circulating medium flowing inside the ').

Hereinafter will be described the operation of the air conditioner using geothermal heat employing a preferred embodiment of the present invention configured as described above.

First, let's look at the air conditioner using geothermal heat to operate the cooling.

The air compressed by the compressors 210 and 210 ′ flows along the pipe to the second heat exchanger 240, and exchanges heat with the circulating medium while passing through the second heat exchanger 240. The refrigerant, which exchanges heat with the circulating medium, flows into the indoor unit 100 through the subcooler 250 and the dryer 263.

The refrigerant flowing into the indoor unit 100 is expanded while passing through the indoor expansion valve 120, and the expanded refrigerant flows into the first heat exchanger 110 to exchange heat with air in the indoor space. The refrigerant heat-exchanged with the air in the indoor space flows into the compressors 210 and 210 'along a pipe, thereby forming a cycle.

In addition, referring to the circulating medium that circulates between the second heat exchanger 240 and the third heat exchanger 300, the circulating medium that is heat-exchanged with the geothermal heat via the third heat exchanger 300 may include a second heat exchanger ( Guided by a pipe connected to 240 is to pass through the second heat exchanger (240). The refrigerant passing through the second heat exchanger 240 exchanges heat with the refrigerant, and the circulation medium exchanged with the refrigerant is introduced into the third heat exchanger while being guided by a pipe.

As such, the circulating medium is circulated between the second heat exchanger 240 and the third heat exchanger 300 to receive or supply energy. In more detail, the refrigerant that supplies energy to the second heat exchanger 240 flows into the third heat exchanger 300 to receive energy while exchanging heat with geothermal heat.

The circulating medium heat-exchanged with the geothermal heat in the third heat exchanger 300 is directed to the second heat exchanger 240 along the recovery pipe 314. The circulating medium heading to the second heat exchanger 240 flows to the district heating heat exchanger 610 and heat exchanges with the hot water supplied from the district heating unit 600 in the district heating heat exchanger 610 and then recovers the piping 314. Will flow).

The circulating medium heat-exchanged with hot water in the district heating heat exchanger (610) flows to the recovery pipe (314) while receiving energy to flow to the second heat exchanger (240). The circulation medium that flows from the recovery pipe 314 to the district heating heat exchanger 610 is controlled by the three-way valve.

That is, when it is determined that the energy of the circulating medium heat-exchanged with the geothermal heat in the third heat exchanger 300 is required, the circulating medium for supplying the necessary energy to the district heating heat exchanger 610 is provided. While flowing and heat-exchanged with hot water, the energy is supplied, and when the energy of the circulating medium heat-exchanged with geothermal heat is sufficient, the fluid is not flowed to the district heat exchanger 610 but flows to the second heat exchanger 240.

Therefore, by controlling the opening degree of the three-way valve, it is possible to control the amount of the circulating medium heat-exchanged with the geothermal heat to the district heating heat exchanger (610) via the third heat exchanger (300).

A pipe through which the circulation medium flows between the hot water supply pump 400 and the hot water tank 500 is connected to the district heating heat exchanger 610 so that the circulation medium can flow. A part or all of the circulating medium flowing between the hot water supply pump 400 and the hot water supply tank 500 flows to the district heating heat exchanger 610 along the pipe, so that the district heating heat exchanger in the district heating unit 600. Heat is exchanged with hot water supplied to 610 to receive energy.

The circulating medium provided with energy exchanges heat with the hot water for hot water stored in the hot water tank 500 to provide the energy that the circulating medium has as hot water for hot water. In this way, the hot water for hot water supply maintains the set temperature, and the user can use the hot water for hot water in which the set temperature is maintained by providing energy that the circulation medium has as hot water for hot water supply.

Then, the hot water for hot water supply can maintain the set temperature by controlling the amount of the refrigerant directed to the district heating heat exchanger (610). In other words, when hot water for hot water supply is sufficient to be provided by heat exchange with hot water supplied from the district heating unit 600 in the district heating heat exchanger 610, the hot water supply heat pump 400 and the entire air conditioning system are operated. It is possible to maintain the hot water for hot water supply to the set temperature by controlling the amount of the circulating medium flowing to the district heating heat exchanger (610).

In addition, when hot water for hot water supply requires more energy, the district heating heat exchanger 610 flows more circulation medium to receive more energy, thereby heating hot water for hot water to a set temperature, and The heat pump 400 is operated to supply more energy to the hot water for hot water supply.

If the temperature of the hot water for hot water maintained at the set temperature is maintained without falling below the set temperature, by controlling the flow direction of the refrigerant directed to the district heating heat exchanger 610, constant energy is continuously supplied to the hot water for hot water supply The hot water can maintain the set temperature.

In this way, the hot water for hot water supply can be maintained at a set temperature by controlling the amount of circulating medium flowing to the district heating heat exchanger 610 and controlling the operation of the hot water supply heat pump 400.

On the other hand, the district heating heat exchanger 610 is connected to the indoor unit 100 by the pipe. When the indoor unit 100 and the district heating heat exchanger 610 are connected to a pipe directly connected to the indoor space, the pipe is installed to heat the indoor space by directly heating the floor of the indoor space and the like.

In addition, when the district heating heat exchanger 610 is connected to the indoor unit 100 by a pipe, the district heating unit 600 in the district heating unit 600 to the refrigerant flowing between the indoor unit 100 and the outdoor unit 200. To provide the energy supplied to 610.

Energy from the hot water flowing from the outdoor unit 200 to the indoor heat exchanger 610 from the district heating unit 600 while the refrigerant flowing from the outdoor unit 200 to the indoor unit 100 passes through the district heat exchanger 610. The supplied energy is supplied to the first heat exchanger 110 to exchange heat with air in the indoor space, thereby harmonizing the indoor space.

In addition, when the indoor space is maintained at a desired set temperature by the user, the indoor space is continuously supplied with constant energy by controlling the amount of the refrigerant flowing to the district heating heat exchanger 610 without operating the outdoor unit 200. Can be maintained at a set temperature.

Referring to the air conditioner using the geothermal heat as a whole, when the air conditioner using the geothermal heat is cooled to operate the circulation medium via the third heat exchanger 300 is cooled while heat exchange with the geothermal heat, the cooled circulation medium is the second heat exchange It is directed to group 240. The circulating medium flowing to the second heat exchanger 240 is cooled by heat exchange with the cooling water via the cooling unit 500 'and then flows to the second heat exchanger 240.

The circulating medium flowing to the second heat exchanger 240 exchanges heat with the refrigerant via the second heat exchanger 240 to cool the refrigerant. The cooled refrigerant is heat-exchanged with the indoor air while passing through the first heat exchanger 110 mounted inside the indoor unit 100 in the supercooled state while passing through the subcooler 250 to exchange indoor air to a user's setting. The interior space is harmonized to fit.

At this time, the temperature of the indoor space by controlling the amount of the circulating medium flowing to the cooling unit (500 ') by the three-way valve mounted to the recovery pipe 314 when the indoor space is lower than the desired set temperature. Can be maintained at the desired set temperature.

On the other hand, when the air conditioner using geothermal heat is heated, the circulating medium that heat-exchanges with geothermal heat while passing through the third heat exchanger 300 receives energy while passing through the district heating heat exchanger 610, thereby increasing the temperature. Done. The circulating medium at which the temperature rises flows along the recovery pipe and flows into the second heat exchanger 240. The circulating medium flowing into the second heat exchanger 240 heats the refrigerant while exchanging heat with the refrigerant.

In addition, a circulation medium that exchanges heat with hot water provided by the district heating unit 600 flows in a pipe between the hot water supply pump 400 and the hot water tank 500 connected to the district heating heat exchanger 610. . The circulation medium receives energy from the hot water provided by the district heating unit 600 while passing through the district heating heat exchanger 610, and again flows into the piping between the hot water supply pump 400 and the hot water tank 500 to supply hot water. It will provide energy to the hot water.

As such, when the circulating medium provides energy to the hot water for hot water supply, the hot water for hot water supply maintains the set temperature even if the air conditioning system is not operated.

The scope of the present invention is not limited to the above embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

In the air conditioner using geothermal heat according to the present invention configured as described above is configured to provide the energy of the hot water supplied from the district heating unit to the circulation medium and the refrigerant or indoor space.

As such, when energy provided by district heating is supplied to the circulating medium, the refrigerant, or the indoor space, continuous energy supply is possible throughout the year, thereby enabling heating at a constant temperature regardless of operation of the air conditioning system.

In addition, in the case of district heating, energy waste is also reduced nationally by using waste heat generated from power plants or waste incinerators.

In addition, in the case of district heating, as the energy source becomes hot water, the user does not produce heat on his own, enabling safer supply of energy, and the safe energy supply makes the user safe from disasters or accidents. have.

In addition, since the user does not generate heat by itself, the cost of own equipment is reduced, and the noise of the own equipment is also reduced.

On the other hand, according to the energy supply by district heating, the temperature change of the refrigerant or the circulating medium does not occur due to the change of the external environment, thereby enabling the operation of a more stable air conditioning system.

The operation of a stable air conditioning system has the effect of extending the life of the product, and also reduces the service cost of the product.

In addition, it is possible to provide hot water for hot water supply of a set temperature without operating the air conditioning system, there is an effect that can maintain the indoor space at the set temperature.

Claims (6)

At least one outdoor unit having a second heat exchanger through which the refrigerant can flow; A plurality of indoor units connected by the outdoor unit and a pipe, each having a first heat exchanger; A third heat exchanger connected to the outdoor unit by pipes and buried underground to exchange heat between the geothermal and circulating media, and wherein the circulating medium exchanges heat with the refrigerant in the second heat exchanger; District heating unit for supplying heat source by district heating; And A district heating heat exchanger connected to the first heat exchanger and the second heat exchanger independently so that the hot water heated by the heat source by the district heating exchanges the circulation medium, and the hot water and the refrigerant exchange heat. Geothermal air conditioner, characterized in that. The method of claim 1, The air conditioner using geothermal heat is connected to the third heat exchanger and the pipe, further comprising a cooling unit for cooling the circulation medium. The method of claim 2, According to the operation mode, the district heating unit and the cooling unit is geothermal air conditioner, characterized in that the selectively operated. delete delete The method of claim 1, A hot water supply pump installed between the outdoor unit and the third heat exchanger to produce hot water for hot water supply by heat exchange with a circulating medium circulating the third heat exchanger; The district heating heat exchanger is a geothermal air conditioner using a heat source configured to supply a heat source for maintaining hot water for hot water.

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