KR20070111930A - Air conditioner using of the subterranean heat - Google Patents

Abstract

An air conditioner using subterranean heat is provided to exchange heat between a refrigerant and water using subterranean heat of a subterranean heat exchanger to improve coefficient of performance and energy efficiency rate, thereby improving air conditioning performance. A plurality of indoor units condition air of an indoor space. A plurality of outdoor units are connected with the plurality of indoor units by a plurality of pipes, having outdoor heat exchangers(140) for exchanging heat and compressors(120,120') for compressing a refrigerant. A subterranean heat exchanger is connected with the outdoor heat exchangers of the outdoor units and is buried in the ground for exchanging heat between subterranean heat and a circulating medium circulating through the inside. Auxiliary heat sources are installed at one side of the outdoor unit for assisting heat exchange of the outdoor heat exchanger.

Description

Air Conditioning System using Geothermal Heat {Air Conditioner using of the subterranean heat}

1 is a state diagram of a conventional multi-type air conditioner.

Figure 2 is a block diagram showing the configuration of the conventional multi-type air conditioner and the refrigerant flow.

Figure 3 is an installation state of the air conditioning system using geothermal heat according to the present invention.

Figure 4 is a block diagram showing the configuration and refrigerant flow of the air conditioning system using geothermal heat according to the present invention.

5 is a block diagram of an outdoor unit that is a main part of an embodiment of the present invention.

Figure 6 is an exploded perspective view partially showing the internal components of the outdoor unit constituting the embodiment of the present invention.

Figure 7 is a block diagram showing a connection state of the auxiliary heat source constituting an embodiment of the present invention.

8 is an operational state diagram showing a state in which the circulation medium circulates along the circulation pipe forming the embodiment of the present invention.

9 is an operational state diagram showing a circulating medium flow state when the hot water heat pump for constituting the embodiment of the present invention is operated.

10 is an operational state diagram showing a circulating medium flow state when the boiler constituting the embodiment of the present invention is operated.

11 is an operating state diagram showing a circulating medium flow state when the cooling tower constituting the embodiment of the present invention is operated.

Explanation of symbols on the main parts of the drawings

100. Outdoor unit 102. Outdoor solenoid valve

120. Constant speed compressor 120 '. Inverter Compressor

120a. Refrigerant injector 121.

121 '. Strainer Oil Temperature Sensor 122. Oil Separator

123. Oil return pipe 124. Four-way valve

130. Supercooler 130 '. Station

130'a. Subcooling Expansion Valve 132. Accumulator

140. Outdoor heat exchanger 200. Indoor unit

202. Indoor heat exchanger 204. Expansion valve

210. Common fluid line 210 '. Basin

210 ". Outdoor liquid pipe 212. Common pipe

212 '. Branches 212 ". Outdoor

214. High and low pressure common pipe 300. Underground heat exchanger

310. Circulation piping 312. Supply piping

314. Return piping 320. Circulation pump

330. Filling tanks 332.

334. Filling valves 340. Storage tanks

400. Hot water supply pump 402. Hot water supply pipe

404. Hot water supply valve 410. Hot water supply heat exchanger

420. Hot water circulation pipe 430. Hot water tank

450. Boiler 452. Boiler supply pipe

454. Boiler Supply Valves 456. Boiler Temperature Sensors

460. Cooling tower 462. Cooling tower supply pipe

464. Cooling tower supply valve 466. Cooling temperature sensor

468. Cooling pump

The present invention relates to an air conditioning system using geothermal heat, and more particularly, to a heat exchange using geothermal heat, and more particularly to an air conditioning system using geothermal heat in which a plurality of compressors are selected and used according to load.

An air conditioning system, commonly referred to as an air conditioner, cools a room by a repetitive action of inhaling hot air in a room, exchanging heat with a low temperature refrigerant, and then discharging it into the room. / Heating system, consisting of a compressor-condenser-expansion valve-evaporator to form a series of cycles.

Recently, in addition to heating and cooling, there are various additional functions such as the air purifying function that inhales and filters contaminated air in the room and makes it into clean air and reinjects it into the room, and the dehumidification function of making humid air into wet and dry air again. It also functions.

Meanwhile, as is well known, an air conditioner may be classified into a separate type air conditioner in which an outdoor unit and an indoor unit are separately installed, and an integrated air conditioner in which the outdoor unit and the indoor unit are integrally installed.

Recently, multi-type air conditioners have been released that can be effectively applied when two or more air conditioners are installed in a home or when an air conditioner is installed in each office in a building having several offices. This multi-type air conditioner is connected to a plurality of indoor units in one outdoor unit, it is possible to obtain the same effect as installing a plurality of separate air conditioner.

1 is a schematic view showing an installation state of a conventional multi-type air conditioner, and FIG. 2 is a block diagram showing a configuration of a conventional multi-type air conditioner and a flow of a refrigerant. Referring to this, the outdoor unit 1 includes a compressor 10, an accumulator 20, an outdoor heat exchanger 30, and the like, and the indoor unit 50 includes an indoor heat exchanger 60 and an expansion valve 70.

In the multi-type air conditioner, a plurality of indoor units 50 are connected to one outdoor unit 1, and a high pressure pipe 80 having a high pressure and a relatively low pressure are connected between the outdoor unit 1 and the indoor unit 50. The low pressure pipes 90 are respectively connected.

When the air conditioner of the configuration as described above to perform the cooling action, the outdoor heat exchanger 30 of the outdoor unit 1 serves as a condenser to condense the refrigerant of the high temperature / high pressure gas state conveyed from the compressor (10). The refrigerant condensed as described above is expanded to a low-temperature / low-pressure gas while passing through the expansion valve 70 and is sent to the indoor heat exchanger 60.

The refrigerant introduced into the indoor heat exchanger 60 is converted into a two-phase refrigerant in which gaseous and liquid states of low temperature / low pressure are mixed as heat is exchanged with indoor air. The refrigerant is passed through the accumulator 20 and then sent back to the compressor 10 to form one cycle of the refrigerant.

Next, when the air conditioner performs the heating operation, the flow of the refrigerant and the action of the heat exchanger are reversed. That is, the refrigerant compressed by the compressor 10 flows in the order of the accumulator 20-> indoor heat exchanger 60-> expansion valve 70-> outdoor heat exchanger 30.

At this time, the indoor heat exchanger 60 serves as a condenser for heat exchange between the high temperature and high pressure refrigerant passing through the inside and the indoor air, and the outdoor heat exchanger 30 heat exchanges the low temperature low pressure refrigerant and the outdoor air therein. It acts as an evaporator.

As described above, in the conventional air conditioning system (air conditioner), a method of using outside air (outside air) as a heat source of the outdoor heat exchanger 30 has been mainly used. That is, the air conditioning system provided with the outdoor unit 1 also called air heat exchange type heat pumps (EHP, GHP) which uses outside air (outside air) as a heat source has been used.

However, in such a heat exchange system using air, the temperature of the outside air is too low during heating and, conversely, too high during cooling. Therefore, there is a problem in that a lot of energy is consumed for heat absorption and discharge of the refrigerant. As such, when the temperature of the outside air is not constant, there is a problem that stable cooling and heating operation is difficult due to an abnormal phenomenon of a heat source required for cooling and heating.

On the other hand, in order to solve the problem of the heat exchange system using the outside air (external air) as described above, in recent years, a basic air conditioning system that performs outdoor heat exchange using geothermal heat as a heat source has emerged. Therefore, such an air conditioning system using geothermal heat exchanges the ground heat as a heat source without being affected by outside temperature, and thus exhibits a higher thermal efficiency (COP, EER) than an air conditioning system using air.

However, many problems appear in the conventional air conditioning system using such geothermal heat. In other words, despite the advantages such as improved thermal efficiency, if the refrigerant flowed through the indoor water heat exchanger during the cooling and heating operation, and the refrigerant flowed into the outdoor water heat exchanger does not sufficiently absorb and release heat into the ground, the stability and reliability of the cooling and heating operation I still have this falling problem.

In addition, the compressor 10 used in the conventional air conditioning system as described above consists of a constant speed compressor for constant speed operation, and consists of only one compressor. Therefore, since the compressor 10 performs the constant speed operation regardless of the excessive load, there is a problem in that power is wasted due to the operation of the compressor 10 when a relatively small load is applied. That is, the capacity of the compressor 10 is determined and installed in preparation for the case where the maximum load is applied. Since the compressor 10 of the large capacity is operated even when a relatively small load is applied, the waste of power is relatively reduced. Will occur.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to provide an air conditioning system using geothermal heat in which heat exchange is performed using underground heat.

Another object of the present invention is to provide an air conditioning system using geothermal heat that is provided with an auxiliary heat source to allow sufficient heat exchange in an outdoor heat exchanger.

Still another object of the present invention is to provide an air conditioning system using geothermal heat, in which a plurality of compressors are provided and the extra compressor is selectively used according to the load capacity.

An air conditioning system using geothermal heat according to the present invention for achieving the above object comprises: a plurality of indoor units that harmonize air in an indoor space; At least one outdoor unit communicating with the indoor unit by a plurality of pipes, the outdoor heat exchanger having a heat exchanger and a compressor for compressing a refrigerant; An underground heat exchanger installed in connection with an outdoor heat exchanger of the outdoor unit, the underground heat exchanger being buried underground so that heat exchange occurs between a circulating medium circulating inside and underground heat; Is installed on one side of the outdoor unit, has a configuration including an auxiliary heat source for assisting heat exchange of the outdoor heat exchanger; The compressor is characterized by consisting of a plurality.

The compressor is characterized by having a configuration including a constant speed compressor for constant speed operation and an inverter compressor that is a variable speed heat pump (Variable Speed Heat Pump).

The constant speed compressor is characterized in that it is selectively used depending on the number of the indoor unit number of the cooling or heating of the plurality of indoor units is required.

The constant speed compressor may be additionally operated when the load capacity is increased so that only the inverter compressor cannot handle the load.

Between the constant speed compressor and the inverter compressor, characterized in that the constant flow compressor and the inverter compressor is installed to communicate with each other.

According to the present invention as described above, there is an advantage that stable heating and cooling is possible and power consumption is prevented.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system in which an outdoor unit, also called ground source heat pumps (GSHPs), is used. It is a system that performs heat exchange in outdoor unit by using (heat exchange water).

Hereinafter, exemplary embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

FIG. 3 schematically shows an installation state of an air conditioning system using geothermal heat according to the present invention, and FIG. 4 schematically shows a block diagram of an air conditioning system using geothermal heat according to the present invention.

As shown in these drawings, the air conditioning system according to the present invention includes at least one indoor unit 200 for coordinating air in an indoor space, and at least one outdoor unit communicating with the indoor unit 200 by a plurality of pipes ( 100) and underground underground heat exchanger (300) for heat exchange between underground heat and circulating medium circulating therein, and a plurality of secondary heat exchangers for outdoor heat exchanger provided in outdoor unit (100). The secondary heat source (400, 450, 460) and the like.

The outdoor unit 100 is a constant speed compressor 120, an inverter compressor 120 ', an accumulator 132 and an outdoor heat exchanger 140 and an outdoor solenoid valve 102 (LEV: linear expansion valve, hereinafter referred to as' outdoor LEV'). .) And the like, and the indoor unit 200 includes an indoor heat exchanger 202, an expansion valve 204, and the like.

In the multi-type air conditioner, a plurality of indoor units 200 are connected to one or more outdoor units 100. The common liquid pipe 210, which is a single pipe through which liquid refrigerant flows, is connected between the outdoor unit 100 and the indoor unit 200, The common engine 212, which is a single pipe through which gas refrigerant flows, is formed in communication. And between the two or more outdoor unit 100 is installed in communication with the high and low pressure common pipe 214 to maintain the balance of the refrigerant.

The high and low pressure common pipe 214 is installed such that the inlet side of the outdoor heat exchanger 140 provided in the plurality of outdoor units 100 communicates with each other to maintain the balance of the refrigerant between the outdoor units 100. Meanwhile, the refrigerant is also introduced into the outdoor heat exchanger 140 of the outdoor unit 100, which is not used among the plurality of outdoor units 100, thereby bringing an effect of improving heat exchange efficiency. And the high or low pressure common pipe 214 is a high pressure or low pressure refrigerant flows in accordance with the cooling or heating action.

The indoor unit 200 is formed with a branch liquid pipe 210 ', through which liquid refrigerant flows, and a branch engine 212' through which gas refrigerant flows, and the branch liquid pipe 210 'and the branch engine 212' are respectively formed. Communicating with the common liquid pipe 210 and the common engine 212.

In addition, the diameters of the plurality of branch liquid pipes 210 'and the branch engine 212' are different depending on the capacity of the indoor unit 200 to be connected.

Meanwhile, the outdoor unit 100 is formed with an outdoor liquid pipe 210 "through which liquid refrigerant flows, and an outdoor engine 212" through which gas refrigerant flows, and the outdoor liquid pipe 210 "and an outdoor engine 212" are respectively formed in the outdoor unit 100. Communicating with the common liquid pipe 210 and the common engine 212.

The plurality of auxiliary heat sources (400, 450, 460) is a device for heating or cooling the circulating medium flowing in the underground heat exchanger (300), two or more of these auxiliary heat sources (400, 450, 460) are operated at the same time, or any one is optional Used as

The plurality of auxiliary heat sources (400, 450, 460) is composed of a hot water supply pump 400, a boiler 450, and a cooling tower 460, as shown. Of course, the auxiliary heat source (400, 450, 460) may be provided with any one of the hot water supply pump 400, the boiler 450, the cooling tower 460, or another device may be further provided.

The hot water heat pump 400 is installed between the outdoor unit 100 and the underground heat exchanger 300 so that the circulation medium circulating the underground heat exchanger 300 emits heat by heat exchange with other exchange water. It is a device to make it.

The boiler 450 is a device installed between the outdoor unit 100 and the underground heat exchanger 300 to heat a circulating medium circulating through the underground heat exchanger 300.

The cooling tower 460 is a device installed between the outdoor unit 100 and the underground heat exchanger 300 to cool the circulating medium circulating the underground heat exchanger 300. Further, a cooling pump 468 for forcing the flow of the circulation medium (water) via the cooling tower 460 is further installed inside or outside the cooling tower 460.

A circulation pipe 310 as shown is provided between the outdoor heat exchanger 140 and the underground heat exchanger 300 of the outdoor unit 100 to guide the circulation of the circulating medium. It consists of a material with a high specific heat, preferably water (H ₂ O).

The circulation pipe 310 is provided with a circulation pump 320 for forcing the flow of the circulation medium. The circulation pump 320 serves to cause the circulation medium inside the circulation pipe 310 to flow in one direction by a power applied from the outside.

In addition, the circulation pipe 310 is further provided with a replenishment tank 330 for replenishing the shortage of the circulation medium flowing through the circulation pipe (310). Then, one side of the replenishment tank 330 is provided with a storage tank 340 for adjusting the pressure of the circulation medium flowing in the circulation pipe 310.

On one side of the hot water supply pump 400, a hot water tank 430 is further provided by the water is heated and stored by heat exchange with the hot water heat pump 400, the hot water heat pump 400 and the hot water tank The hot water pump 432 for forcibly flowing the water circulated between the 430 is installed.

Configuration and connection state of the auxiliary heat source (400, 450, 460) as described above will be described in detail below.

5 schematically shows a configuration of the outdoor unit constituting the air conditioning system according to the present invention. And, Figure 6 is an exploded perspective view of a number of parts provided in the outdoor unit.

As shown in these figures, a plurality of compressors 120 and 120 'are installed in the outdoor unit 100. The compressors 120 and 120 'compress the refrigerant to be at a high temperature and high pressure. That is, the constant speed compressor 120 for constant speed operation and the inverter compressor 120 ', which is a variable speed heat pump, are installed above the base fan 110 forming a lower appearance.

A refrigerant injector 120a is installed at the inlet side of the compressors 120 and 120 '. The refrigerant injector 120a prevents the compressor from being burned by supplying a refrigerant when the compressors 120 and 120 'are overheated according to operating conditions, and the refrigerant used herein is an outdoor heat exchanger 140 to be described below. It is preferred that the refrigerant discharged from is configured to be used.

A constant oil compressor 121 is installed between the constant speed compressor 120 and the inverter compressor 120 'such that the constant speed compressor 120 and the inverter compressor 120' communicate with each other. Therefore, when oil supply shortage occurs in one of the compressors, the compressor 120 is replenished from the other compressor to prevent burnout of the compressors 120 and 120 'due to the insufficient flow rate.

As the compressors 120 and 120 ', a scroll compressor having low noise and excellent efficiency is used. In particular, the inverter compressor 120' is an inverter scroll compressor whose rotation speed is adjusted according to a load capacity. Therefore, when a small number of indoor units 200 are used and the load capacity is small, the inverter compressor 120 'is operated first, and the constant speed compressor is not available when the load capacity is gradually increased and cannot be handled by the inverter compressor 120'. 120 is activated.

At the outlet side of the constant speed compressor 120 and the inverter compressor 120 ', the compressor discharge temperature sensors 120b and 120'b and the oil separator 122 respectively measure the temperature of the refrigerant discharged from the compressors 120 and 120'. do. The oil separator 122 filters the oil mixed in the refrigerant discharged from the compressors 120 and 120 'to be recovered to the compressors 120 and 120'.

That is, oil used to cool frictional heat generated when the compressors 120 and 120 'are driven is discharged to the outlet of the compressors 120 and 120' together with a refrigerant. The oil in the refrigerant is separated into the oil separator 122. Separated from and sent back to the compressor (120, 120 ') through the oil return pipe (123).

In addition, a check valve 122 ′ is further installed at an outlet side of the oil separator 122 to prevent a backflow of the refrigerant. That is, when only one of the constant speed compressor 120 or the inverter compressor 120 'is operated, the compressed refrigerant is not flowed back into the stationary compressors 120 and 120'.

The oil separator 122 is configured to communicate with the four-way valve 124 by the pipe. The four-way valve 124 is arranged to change the flow direction of the refrigerant according to the cooling and heating operation, each port is an outlet (or oil separator) of the compressor (120, 120 '), the inlet of the compressor (120, 120') Or an accumulator), an outdoor heat exchanger 140, and an indoor unit 200.

Therefore, the refrigerant discharged from the constant speed compressor 120 and the inverter compressor 120 'is collected in one place, and then flows into the four-way valve 124. The compressors 120 and 120' are provided at the inlet of the four-way valve 124. The high pressure sensor 124 'for checking the pressure of the refrigerant discharged from the is installed.

Meanwhile, a hot gas pipe 125 for allowing a part of the refrigerant flowing into the four-way valve 124 from the oil separator 122 to be directly introduced into the accumulator 132 will be described below. It is installed across the directional valve (124).

When the hot gas pipe 125 needs to increase the pressure of the low pressure refrigerant flowing into the accumulator 132 during the operation of the air conditioner, the high pressure refrigerant at the discharge port of the compressors 120 and 120 'is directly directed to the inlet side of the compressor 120 and 120'. In order to be supplied, such a hot gas pipe 125 is provided with a hot gas valve 125 ′, which is a bypass valve, to open and close the pipe.

In addition, the subcooler 130 is provided inside the outdoor unit 100. The supercooler 130 is a subcooling means for further cooling the refrigerant heat exchanged in the outdoor heat exchanger 140, which will be described below, of the outdoor liquid pipe 210 "connected to the outlet side of the outdoor heat exchanger 140. It is formed at an arbitrary position.

The supercooler 130 is formed of a double tube. That is, the outdoor liquid pipe 210 " is provided on the inside, and a reverse feed pipe 130 'is formed on the outside. Thus, the reverse feed pipe 130' is branched from the outlet of the supercooler 130. The transfer pipe 130 'is provided with a supercooled expansion valve 130'a for cooling the refrigerant by expansion.

In this case, a part of the refrigerant discharged from the subcooler 130 is introduced into the reverse transfer pipe 130 'and cooled while passing through the subcooling expansion valve 130'a, and the cooled refrigerant is the subcooler ( While refluxing 130, the inner refrigerant is further cooled. The countercurrent coolant exiting the subcooler 130 is supplied to the accumulator 132 to be described below and circulated.

On the other hand, the outlet of the subcooler 130 is installed with a liquid pipe temperature sensor 130a for measuring the temperature of the refrigerant discharged from the outdoor unit 100, the subcooling inlet sensor 130 at the outlet of the subcooling expansion valve (130'a). 'b) is provided to measure the temperature of the reflux refrigerant flowing into the subcooler 130, the supercooling outlet sensor 130'c in the reverse transfer pipe 130' flowing the reflux refrigerant discharged from the subcooler 130 ) Is provided.

Therefore, the refrigerant passing through the outdoor heat exchanger 140 flows through the center portion and is configured such that the low temperature refrigerant expanded by an expansion valve (not shown) flows in the opposite direction to lower the temperature of the refrigerant.

One side of the subcooler 130, that is, a dryer 131 is provided on one side of the outdoor liquid pipe 210 ″ in which the refrigerant discharged from the outdoor heat exchanger 140 to be described below is guided to the indoor unit 200. The dryer 131 serves to remove moisture contained in the refrigerant flowing through the outdoor liquid pipe 210 ".

An accumulator 132 is installed between the constant speed compressor 120 and the inverter compressor 120 ′. The accumulator 132 filters the liquid refrigerant so that only the gaseous refrigerant flows into the compressors 120 and 120 '.

That is, when the refrigerant remaining in the liquid phase without being evaporated into gas among the refrigerant flowing from the indoor unit 200 directly flows into the compressors 120 and 120 ', the compressor is formed into a gaseous refrigerant having a high temperature and high pressure. ), The load is increased, which causes damage to the compressors 120 and 120 '.

Therefore, among the refrigerants introduced into the accumulator 132, the refrigerant which is not evaporated and remains in the liquid phase is stored in the lower part of the accumulator 132 because it is relatively heavier than the refrigerant in the gas phase, and only the gaseous refrigerant in the upper portion of the compressor 120, 120 Flows into '). On the other hand, the inlet side of the accumulator 132 is provided with a suction pipe temperature sensor 132 ′ for measuring the temperature of the refrigerant sucked and a low pressure sensor 132 ″ for checking the pressure of the refrigerant.

The outdoor heat exchanger 140 is provided inside the outdoor unit 100. The outdoor heat exchanger 140 is a water-cooled heat exchanger such that heat exchange occurs between a refrigerant flowing inside and a circulation medium flowing along the circulation pipe 310.

Although not shown, the outdoor heat exchanger 140 made of a water-cooled heat exchanger is preferably made of a plate heat exchanger type in which a plurality of thin plates are alternately stacked. Therefore, some of such thin plates are configured such that a refrigerant passes therein, and some of the thin plates pass through the circulation medium (water). That is, since the thin plates through which the refrigerant and the circulating medium pass are alternately stacked, the refrigerant and the circulating medium flow in a direction intersecting with each other inside the thin plates to exchange heat.

7 illustrates the configuration and connection state of the auxiliary heat sources 400, 450, and 460 in more detail.

As shown in the figure, the outdoor heat exchanger 140 of the outdoor unit 100 is connected to the refrigerant pipe and the circulation pipe 310 communicating with the indoor heat exchanger 202. That is, the outdoor heat exchanger 140 is connected to the outdoor liquid pipe 210 ", the outdoor engine 212", and the circulation pipe 310, respectively.

Accordingly, heat exchange occurs between the refrigerant flowing in the outdoor liquid pipe 210 ″ and the outdoor engine 212 ″ and the circulation medium (water) flowing in the circulation pipe 310. The circulation pipe 310 is formed to form a closed circuit as a whole, so that the circulation medium therein is continuously circulated while being blocked from the outside.

The underground heat exchanger (300) is a heat exchange between the heat of the underground and the circulation medium flowing in the circulation pipe 310, buried in the deep underground. That is, it is usually preferable to be buried up to 200m above the ground, the depth of the underground heat exchanger 300 depends on the climate of the installation area, it is buried at a depth that can maintain the annual average temperature of the area at all times desirable.

The geothermal heat exchanger 300 may be provided in plurality, it is preferably made of a zigzag shape bent a plurality of times as shown.

As described above, the circulation pipe 310 is connected between the underground heat exchanger 300 and the outdoor heat exchanger 140 to guide the circulation medium (water). The circulation pipe 310 is a supply pipe 312 for guiding the circulation medium to the underground heat exchanger 300 and the circulation medium via the underground heat exchanger 300 is the outdoor heat exchanger 140 again. Return pipe 314 or the like to guide the return to the.

The return pipe 314 is provided with a circulation temperature sensor 316. More specifically, the circulation temperature sensor 316 is installed at the outlet side of the underground heat exchanger 300, and the circulation temperature sensor 316 measures the temperature of the circulation medium via the underground heat exchanger 300. The value measured by the circulation temperature sensor 316 is transmitted to a controller (not shown) that controls the entire system.

The hot water heat pump 400 is used together with the underground heat exchanger 300 or optionally used. That is, it is also possible to use only the hot water supply heat pump 400 for heat exchange of the outdoor heat exchanger 140 without using the underground heat exchanger 300.

A hot water supply pipe 402 and a hot water return pipe 402 ′ are respectively installed between the circulation pipe 310 and the hot water heat pump 400 to guide the flow of the circulating medium (water). In more detail, the hot water supply pipe 402 for guiding the circulating medium from the supply pipe 312 to the hot water heat pump 400 is branched, and the hot water heat pump (314) from the return pipe 314 The hot water return pipe 402 ′ which guides the circulating medium that passes through 400 and then returns to the return pipe 314 is branched.

The hot water supply valve 404 is provided at the connection portion of the supply pipe 312 and the hot water supply pipe 402, and the hot water return valve 404 ′ is provided at the connection portion of the return pipe 314 and the hot water supply return pipe 402 ′. It is provided. The hot water supply valve 404 and the hot water return valve 404 ′ are composed of three-way valves (three-way valves) capable of controlling fluid flow in three directions.

Therefore, the hot water supply valve 404 is supplied from the outdoor heat exchanger 140 to the circulation medium flowing along the supply pipe 312 to both the underground heat exchanger 300 and the hot water supply heat pump 400 at the same time. Or, it is controlled to be supplied to any one side of the underground heat exchanger 300 and the hot water heat pump 400.

The hot water returning pipe 402 ′ is provided with a hot water temperature sensor 406. That is, the hot water supply temperature sensor 406 is installed at the outlet side of the hot water supply heat pump 400, and the hot water temperature sensor 406 is discharged from the hot water supply heat pump 400 through the hot water return pipe 402 ′. It serves to measure the temperature of the circulating medium. The hot water temperature sensor 406 is connected to a controller (not shown) to provide the measured temperature to the controller.

An inside of the hot water supply heat pump 400 is further provided with a hot water heat exchanger 410 through which heat exchange occurs. The hot water supply heat exchanger 410 allows the circulating medium passing through the hot water supply heat pump 400 to exchange heat with the exchange water circulating in the hot water tank 430.

Looking in more detail, the hot water supply tank 430 is connected to one side (the right side in FIG. 7) of the hot water heat pump 400. And, between the hot water supply heat exchanger 410 and the hot water supply tank 430 is connected to the hot water circulation pipe 420 forming a closed circuit, the exchange water (water) is circulated inside the hot water circulation pipe 420. . Therefore, the exchange water (water) flowing inside the hot water circulation pipe 420 passes through the hot water heat exchanger 410, and heat exchange occurs with the circulation medium.

Of course, in the above, the inside of the hot water supply heat pump 400 has been briefly described, for example, provided with only one hot water heat exchanger 410 in which heat exchange occurs, but the inside of the hot water heat pump 400 is substantially Like the inside of the outdoor unit 100, two heat exchangers and a compressor that serve as a condenser and an evaporator are provided to form a refrigerant cycle through which the refrigerant is circulated. Then, the heat exchanger acts as a condenser and an evaporator to exchange heat with the exchange water and the circulating medium.

In addition, the exchange water heated by the heat exchange with the circulation medium in the hot water supply heat exchanger 410 is introduced into the hot water tank 430 along the hot water circulation pipe 420 to exchange heat with water stored in the hot water tank 430. Will be In this case, the water stored in the hot water tank 430 is heated.

The hot water circulation pipe 420 is provided with a hot water pump 432. The hot water pump 432 is a pump that allows the exchange water (water) flowing in the hot water circulation pipe 420 to continuously flow in one direction, and is operated by a power supplied from the outside.

The boiler 450 is for heating the circulation medium and is connected to the circulation pipe 310. That is, the return pipes 314 of the circulation pipes 310 are connected to each other.

Looking in more detail, the boiler 450 is to heat the circulating medium by the energy supplied from the outside, between the boiler 450 and the return pipe 314 between the boiler supply pipe 452 and the boiler return pipe ( 452 ') are each in communication.

The boiler supply pipe 452 is a flow path for guiding the circulation medium flowing inside the return pipe 314 into the boiler 450, and the boiler return pipe 452 'is circulated through the boiler 450. The flow path guides the medium to return to the return pipe 314.

A boiler supply valve 454 and a boiler return valve 454 'are respectively installed at the connection portion between the return pipe 314, the boiler supply pipe 452, and the boiler return pipe 452'. Like the hot water supply valve 404 and the hot water return valve 404 ′ described above, the boiler supply valve 454 and the boiler return valve 454 ′ are three-way valves capable of controlling fluid flow in three directions. Therefore, the circulation medium supply to the boiler 450 is controlled according to the opening and closing of the boiler supply valve 454 and the boiler return valve 454 '.

A boiler temperature sensor 456 is installed in the boiler return pipe 452 '. That is, the boiler temperature sensor 456 is a sensor for measuring the temperature of the circulating medium via the boiler 450, and the value (measurement temperature) measured by the boiler temperature sensor 456 is transmitted to the controller.

The cooling tower 460 is connected to the return pipe 314. The cooling tower 460 is a device for cooling the circulation medium by contact with air. Since the cooling tower 460 is a device used for cooling the cooling water in a factory or the like, its detailed configuration and principle are omitted.

The cooling tower supply pipe 462 and the cooling tower return pipe 462 ′ are respectively communicated between the return pipe 314 and the cooling tower 460. The cooling tower supply pipe 462 is a flow path for guiding the circulation medium flowing inside the return pipe 314 into the cooling tower 460, and the cooling tower return pipe 462 ′ is circulated through the cooling tower 460. The flow path guides the medium to return to the return pipe 314.

Cooling tower supply valve 464 and cooling tower return valve 464 'are respectively provided at the connection portion between the return pipe 314, the cooling tower supply pipe 462, and the cooling tower return pipe 462'. The cooling tower supply valve 464 and the cooling tower return valve 464 ′ also include a three-way valve capable of controlling fluid flow in three directions, similarly to the hot water supply valve 404 and the hot water return valve 404 ′ described above. Therefore, the supply of the circulation medium to the cooling tower 460 is controlled in accordance with the opening and closing of the cooling tower supply valve 464 and the cooling tower return valve 464 '.

The cooling tower return pipe 462 ′ is provided with a cooling temperature sensor 466. That is, the cooling temperature sensor 466 is a sensor for measuring the temperature of the circulating medium via the cooling tower 460, and the value (temperature) measured by the cooling temperature sensor 466 is transmitted to the controller.

On the other hand, the cooling tower return pipe 462 'is further provided with a cooling pump 468. The cooling pump 468 applies pressure in one direction (right in FIG. 7) so that the circulation medium via the cooling tower 460 flows to the outdoor heat exchanger 140 through the return pipe 314. That is, the circulating medium introduced into the cooling tower 460 is exposed to the air for heat exchange with the air, and then collected again to flow through the cooling tower return pipe 462 '. As such, the cooling pump 468 forces the flow of the circulating medium flowing through the cooling tower return pipe 462 'and prevents the backflow of the circulating medium.

The circulation pump 320 is to force the flow of the circulation medium flowing through the circulation pipe 310, it is preferably installed in the return pipe (314). In more detail, as shown, the circulation pump 320 is installed between the storage tank 340 and the boiler 450 to force the flow of the circulation medium in one direction (the right side in FIG. 7).

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 for replenishing the circulating medium lacking due to leakage or evaporation through the circulation pipe 310.

The replenishment tank 330 is configured to communicate with the return pipe 314 and the replenishment pipe 332. The replenishment pipe 332 is provided with a replenishment valve 334 to control the circulation medium supplied to the return pipe 314 by opening and closing the replenishment pipe 332.

The replenishment valve 334 is configured to be opened and closed manually by a user, or automatically opened and closed by the control of a controller (not shown).

The storage tank 340 is for controlling the pressure of the circulation medium flowing in the circulation pipe 310, it is formed to communicate with the return pipe 314 and the storage pipe 342. That is, the storage tank 340 is to be a buffer area for adjusting the pressure of the circulation medium inside the circulation pipe 310 that changes instantaneously, as shown, spaced apart from the return pipe 314 or the return pipe ( 314 is integrally formed in the middle.

It looks at the operation of the air conditioning system using geothermal heat according to the present invention having the configuration as described above.

First, the flow of the refrigerant and the circulating medium will be described with reference to FIG. 4.

Since a closed circuit through which refrigerant flows is formed between the indoor unit 200 and the outdoor unit 100, the refrigerant exchanges heat while circulating the outdoor unit 100 and the indoor unit 200 as shown by the arrows.

At this time, the outdoor heat exchanger 140 is composed of a water-cooled heat exchanger. Therefore, in the outdoor heat exchanger 140, a refrigerant circulating between the indoor unit 200 and the outdoor unit 100 and a circulating medium (water) circulating between the outdoor unit 100 and the underground heat exchanger 300 are mutually selected. Heat exchange will occur.

On the other hand, the flow of the refrigerant flowing between the indoor unit 200 and the outdoor unit 100 is the direction of the flow is opposite to each other according to the cooling or heating of the indoor space. On the other hand, the direction of the circulation medium (water) flowing along the circulation pipe 310 is always constant and does not need to be reversed. That is, it continues to flow in the direction shown by the arrow in FIG.

Next, with reference to FIGS. 4 and 5 will be described in more detail with respect to the flow of the refrigerant flowing between the outdoor unit 100 and the indoor unit 200 and each action.

As described above, in the air conditioning system according to the present invention, a plurality of indoor units 200 are connected to one outdoor unit 100, and some or all indoor units 200 are operated according to a user's selection.

When the air conditioning system is operated (cooling operation), the outdoor LEV 102 is opened so that refrigerant flows between the outdoor unit 100 and the indoor unit 200.

First, referring to the refrigerant flow in the outdoor unit 100, the gas refrigerant flowing from the indoor unit 200 passes through the four-way valve 124 and then enters the accumulator 132. The gas refrigerant leaving the accumulator 132 is introduced into the compressors 120 and 120 '. Meanwhile, when the refrigerant supplied to the compressors 120 and 120 'is insufficient or the compressors 120 and 120' are overheated, the refrigerant is supplied from the refrigerant injector 120a.

The refrigerant compressed by the compressors 120 and 120 ′ is discharged to the discharge port and passes through the oil separator 122. In the oil separator 122, oil contained in the refrigerant is separated and recovered to the compressors 120 and 120 ′ through the oil recovery pipe 123.

That is, as the refrigerant is compressed in the compressors 120 and 120 ', oil is mixed in the refrigerant. Since the oil is in the liquid state and the refrigerant is in the gas state, the oil is separated from the oil separator 122 which is the gas-liquid separator.

On the other hand, the oil inside the compressors 120 and 120 'on both sides is balanced by the homogenizing pipe 121 connecting the constant speed compressor 120 and the inverter compressor 120'.

The refrigerant passing through the oil separator 122 flows into the outdoor heat exchanger 140 through the four-way valve 124. Since the outdoor heat exchanger 140 functions as a condenser (in the cooling mode), the refrigerant is cooled through heat exchange with a circulating medium to become a liquid refrigerant. The refrigerant passing through the outdoor heat exchanger 140 is further cooled while passing through the subcooler 130.

The refrigerant passing through the supercooler 130 passes through a dryer 131 for removing moisture contained in the refrigerant, and then flows into the indoor unit 200 through the common liquid pipe 210. Meanwhile, some of the refrigerant passing through the compressors 120 and 120 'may be introduced into another outdoor unit 100 through the high and low pressure common pipe 214.

The refrigerant supplied to the other outdoor unit 100 through the high and low pressure common pipe 214 flows into the outdoor heat exchanger 140 of the outdoor unit 100 that is stopped to balance the refrigerant pressure as a whole, and the outdoor unit that is stopped ( The predetermined heat exchange also occurs through the outdoor heat exchanger 140 of 100).

When the refrigerant is supplied to the indoor unit 200 through the common liquid pipe 210, the refrigerant is supplied to each indoor unit 200 in operation through the branched liquid pipe 210 ′ branched from the common liquid pipe 210. The refrigerant is decompressed in the expansion valve 204 and heat exchanges in the indoor heat exchanger 202. At this time, since the indoor heat exchanger 202 serves as an evaporator, the refrigerant becomes low pressure gas through heat exchange.

The refrigerant discharged from the indoor heat exchanger 202 is collected through the branch engine 212 ′ to the common engine 212 and then flows into the outdoor unit 100. The refrigerant introduced into the outdoor unit 100 through the common engine 212 and the outdoor engine 212 ″ enters the accumulator 132 through the four-way valve 124.

In the accumulator 132, the liquid refrigerant that has not been evaporated is filtered out, and only the refrigerant in the gaseous state is selected and supplied to the compressors 120 and 120 '. Through this process, one cycle is completed.

On the other hand, when the flow of the refrigerant occurs as described above, the constant speed compressor 120 of the compressor (120, 120 ') is selectively used. For example, when all the indoor units 200 are cooled, the plurality of indoor heat exchangers 202 are all operated to generate the maximum load. In this case, the inverter compressor 120 'as well as the constant speed compressor 120 will also be operational.

On the other hand, when cooling is performed only in one or two indoor units 200 of the plurality of indoor units 200, since a relatively low load is generated, only the inverter compressor 120 ′ may be sufficient. Therefore, in this case, the constant speed compressor 120 is not operated and only the inverter compressor 120 'is operated. Since the inverter compressor 120' is also variable, the rotation speed is adjusted according to the size of the load.

When the air conditioning system using the geothermal heat according to the present invention is operated by heating operation, the refrigerant flows in the opposite direction to the above, and the amount of the refrigerant is controlled in the outdoor LEV 102.

8 to 11 illustrate a state in which the circulation medium (water) flows through the circulation pipe 310.

First, FIG. 8 shows a basic circuit in the case where the underground heat exchanger 300 is used alone. That is, a plurality of auxiliary heat sources 400, 450, and 460 are not used, and a state in which a circulating medium (water) circulates between the outdoor heat exchanger 140 and the underground heat exchanger 300 as an arrow is illustrated.

In this case, the hot water supply pipe 402 and the hot water supply return pipe 402 ', the boiler supply valve 454 and the boiler return valve 454', and the cooling tower supply valve 464 and the cooling tower return valve 464 '. By the circulation medium flow to the hot water supply pump 400, the boiler 450 and the cooling tower 460 is blocked.

Accordingly, the circulation medium flowing along the circulation pipe 310 continuously circulates in the counterclockwise direction as shown by an arrow in FIG. 8, and this flow direction is irrespective of whether it is cooled or heated by an air conditioning system. Maintain a constant direction. That is, the outdoor heat exchanger 140 is circulated in a constant direction regardless of whether it is used as a condenser or an evaporator.

However, when the outdoor heat exchanger 140 is used as a condenser (in the cooling mode), the circulation medium flowing through the circulation pipe 310 serves to cool the refrigerant in the outdoor heat exchanger 140. On the contrary, when the outdoor heat exchanger 140 is used as an evaporator (when heating mode), the circulation medium flowing through the circulation pipe 310 will serve to heat the refrigerant in the outdoor heat exchanger 140.

When the circulation medium flowing through the circulation pipe 310 is insufficient, the user manually opens the replenishment valve 334 to replenish the circulation medium according to a signal of a controller (not shown), or control of the controller. The replenishment valve 334 is automatically opened and closed accordingly.

In addition, the circulation pump 320 allows the circulation medium flowing through the circulation pipe 310 to continuously flow in one direction (counterclockwise direction in FIG. 10) without being reversed, and the circulation pump 320 is applied from the outside. It is driven by the power supply.

Such a circulation mechanism is the simplest use mechanism using geothermal heat in the air conditioning system according to the present invention. In this state, when the temperature of the circulation medium measured by the circulation temperature sensor 316 does not reach the required temperature, The auxiliary heat sources 400, 450 and 460 described above are operated. That is, when the temperature of the circulating medium in the return pipe 314 passing through the underground heat exchanger 300 does not become a temperature sufficient to cool or heat the refrigerant in the outdoor heat exchanger 140, the auxiliary heat source ( At least one of 400, 450, and 460 is operated to cool or heat the circulating medium.

9 illustrates a circulating medium flow when the hot water heating pump 400 is operated. As shown in FIG. 9, the hot water heating pump 400 operates mainly when the air conditioning system according to the present invention is operated in a cooling mode.

First, arrows indicate solid lines when the circulating medium is simultaneously supplied to both the underground heat exchanger 300 and the hot water heat pump 400. Therefore, at this time, the hot water supply valves 404 are all opened to guide the circulating media from the outdoor heat exchanger 140 to both the underground heat exchanger 300 and the hot water heat pump 400. .

In addition, at this time, since the hot water supply tank 430 is also operated, the exchange water flows inside the hot water circulation pipe 420. Therefore, heat exchange occurs in the hot water supply heat exchanger 410. That is, in the hot water supply heat exchanger 410, the circulation medium is cooled by heat exchange with the exchange water in the hot water circulation pipe 420. In this case, water is heated in the hot water tank 430 to generate hot water.

Meanwhile, the circulating medium cooled while passing through the underground heat exchanger 300 and the hot water heat pump 400 are combined again and introduced into the outdoor heat exchanger 140. In the outdoor heat exchanger 140, the cooled circulation medium and the high temperature refrigerant exchange heat with each other, so that the refrigerant is cooled and the circulation medium is heated.

Next, the flow in which the arrow is shown by the dotted line is a case where the circulation medium passes only through the hot water supply pump 400. That is, there is a case where the circulation medium does not flow through the underground heat exchanger (300).

In this case, the hot water supply valve 404 blocks the flow path to the underground heat exchanger 300, opens only the flow path to the hot water heat pump 400, and the circulation medium coming from the outdoor heat exchanger 140 receives the hot water supply. The control is performed only via the heat pump 400.

In this case, since the hot water supply tank 430 is also operated as described above, in the hot water heat exchanger 410, heat exchange occurs between the circulating medium and the exchange water, and the circulating medium is cooled.

The circulating medium discharged after passing through the hot water supply heat pump 400 has a temperature value measured by the hot water temperature sensor 406, and the measured temperature value is transmitted to a controller (not shown). Therefore, the controller determines whether the temperature of the circulating medium from the hot water supply heat pump 400 is sufficient to cool the refrigerant in the outdoor heat exchanger 140 to determine whether the other auxiliary heat source (cooling tower) is operated. .

For example, when the temperature of the circulating medium from the hot water supply pump 400 is higher than the cooling threshold temperature of the refrigerant to be cooled in the outdoor heat exchanger 140, the circulating medium passes through the cooling tower 460. Should be further cooled. Here, the cooling threshold temperature is a value set as an upper limit of the temperature required for condensation of the gaseous refrigerant in the outdoor heat exchanger 140 during the cooling operation of the air conditioning system.

In addition, as described above, a process in which the circulation medium introduced into the outdoor heat exchanger 140 exchanges heat with the refrigerant.

10 illustrates a case where the boiler 450 is operated. That is, when the boiler 450 is operated to further increase the temperature of the circulating medium coming out of the underground heat exchanger 300, in which case the air conditioning system according to the present invention is operated for heating (heating mode). do.

When the boiler 450 is operated as illustrated in FIG. 10, the temperature measured by the circulation temperature sensor 316 may not be a temperature sufficient to heat the refrigerant in the outdoor heat exchanger 140, or air conditioning. Used to double the heating capacity of the system. That is, it is used when the temperature of the circulating medium passing through the underground heat exchanger 300 is lower than the heating threshold temperature of the refrigerant flowing into the outdoor heat exchanger 140 or when the heating is to be made stronger. Here, the heating critical temperature is a value set as a lower limit of the temperature required for evaporation of the liquid refrigerant in the outdoor heat exchanger 140 during the heating operation of the air conditioning system.

In this case, as shown, the boiler supply valve 454 opens the flow path to the boiler 450 so that the circulation medium coming from the underground heat exchanger 300 passes through the boiler 450.

More specifically, the control unit (not shown) blocks the right flow path of the boiler supply valve 454 when the temperature of the circulation medium measured by the circulation temperature sensor 316 is lower than the heating critical temperature. The lower side passage is opened so that the circulation medium via the underground heat exchanger 300 flows into the boiler 450. At the same time, the lower flow path of the boiler return valve 454 'is opened.

At this time, the hot water supply pipe 402 and the hot water return pipe 402 ', the cooling tower supply valve 464, and the cooling tower return valve 464' are provided to the hot water supply pump 400 and the cooling tower 460. Circulating medium flow is shut off.

The boiler 450 is heated by power or energy from the outside to increase the temperature of the circulating medium, the temperature of the circulating medium via the boiler 450 is measured by the boiler temperature sensor 456 to control Is passed to. Therefore, the control unit adjusts the circulating medium heating water level in the boiler 450 according to the temperature value transmitted from the boiler temperature sensor 456. Therefore, the temperature of the circulating medium measured by the boiler temperature sensor 456 should be higher than the heating critical temperature.

The circulating medium sufficiently heated (heated above the heating threshold temperature) while passing through the boiler 450 is introduced into the outdoor heat exchanger 140 to exchange heat with the refrigerant to be introduced into the indoor unit 200. Thus, the circulation medium is cooled and the refrigerant is heated.

11 illustrates a case where the cooling tower 460 is used as an auxiliary heat source. As such, when the circulating medium is cooled while passing through the cooling tower 460, the air conditioning system according to the present invention will mainly be operated in the cooling mode. That is, when the temperature of the circulating medium heat-exchanged in the underground heat exchanger 300 is higher than the cooling threshold temperature of the refrigerant to be heat-exchanged in the outdoor heat exchanger 140, or to improve the cooling capacity of the air conditioning system further. This is an example used in the case.

In more detail, if the temperature of the circulating medium detected by the circulation temperature sensor 316 does not reach the cooling threshold temperature, the controller opens the upper flow passage of the cooling tower supply valve 464 and blocks the right flow passage. At the same time, the upper passage of the cooling tower return valve 464 'is opened.

In this case, the flow path to the cooling tower 460 is opened so that the circulation medium via the underground heat exchanger 300 flows into the cooling tower 460 through the cooling tower supply pipe 462 and is cooled. In addition, the circulation medium cooled by the cooling tower 460 flows to the cooling tower return pipe 462 'by the cooling pump 468, and subsequently flows into the outdoor heat exchanger 140. At this time, the temperature of the circulating medium measured by the cooling temperature sensor 466 should be kept lower than the cooling threshold temperature.

The low temperature circulating medium introduced into the outdoor heat exchanger 140 undergoes heat exchange with the high temperature refrigerant. Therefore, the circulating medium becomes high temperature by heat exchange, and the refrigerant becomes low temperature by heat exchange to flow into the indoor unit 200 to cool the indoor space (space for air conditioning).

As described above, in the air conditioning system using geothermal heat according to the present invention, the control unit operates the plurality of auxiliary heat sources 400, 450, and 460 based on the temperature value measured by the circulation temperature sensor 316. That is, when it is necessary to further cool the circulation medium via the underground heat exchanger 300 in the cooling mode, the hot water supply pump 400 or the cooling tower 460 is selectively or simultaneously operated. In the heating mode, when it is necessary to further heat the circulating medium via the underground heat exchanger 300, the circulating medium further passes through the boiler 450.

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

For example, in the above embodiment, two compressors 120 and 120 'are provided. However, three or more such compressors 120 and 120 'may be provided. That is, a compressor having other functions in addition to the constant speed compressor 120 and the inverter compressor 120 'may be further provided, or the constant speed compressor 120 and the inverter compressor 120' may be provided with two or more, respectively. Of course.

In the air conditioning system using geothermal heat according to the present invention as described above,

first. In the outdoor heat exchanger provided in the outdoor unit, the refrigerant exchanges heat with a circulation medium such as water, and the circulation medium exchanges heat with the ground heat in the underground heat exchanger installed deep in the ground. As described above, the outdoor heat exchanger of the present invention is composed of a circulating medium (water) using underground heat and a water-cooled heat exchanger in which heat exchange takes place. Indicates. Therefore, the air conditioning performance of the air conditioning system is improved.

second. The present invention consists of a system for heating or cooling a circulating medium by using an auxiliary heat source in addition to an underground heat exchanger using geothermal heat. Therefore, when the geothermal heat is insufficient to condense or evaporate the refrigerant in the outdoor heat exchanger, the auxiliary heat source is activated to assist in heating or cooling the circulating medium. Therefore, there is an advantage that the evaporation or condensation of the refrigerant is possible by the auxiliary heat source even in an environment in which geothermal heat is insufficient to evaporate or condense the refrigerant in the outdoor heat exchanger. That is, in the air conditioning system according to the present invention, it is possible to exhibit stable air conditioning performance without being affected by geothermal heat.

third. In the present invention, a constant speed compressor and an inverter compressor are provided, and are selectively used according to the size of the load. Therefore, when a relatively small load is generated, it is possible to solve only by operating the inverter compressor, thereby reducing the power as compared to using a single compressor having a large capacity as in the prior art. That is, when the load is small, there is an advantage that the waste of power for driving the compressor is prevented.

Claims (5)

A plurality of indoor units which match the air of the indoor space; At least one outdoor unit communicating with the indoor unit by a plurality of pipes, the outdoor heat exchanger having a heat exchanger and a compressor for compressing a refrigerant; An underground heat exchanger installed in connection with an outdoor heat exchanger of the outdoor unit, the underground heat exchanger being buried underground so that heat exchange occurs between a circulating medium circulating inside and underground heat; Is installed on one side of the outdoor unit, has a configuration including an auxiliary heat source for assisting heat exchange of the outdoor heat exchanger; The compressor is a geothermal air conditioning system, characterized in that consisting of a plurality. The method of claim 1, wherein the compressor, With a constant speed compressor for constant speed operation, An air conditioning system using geothermal heat, characterized by having a configuration including an inverter compressor that is a variable speed heat pump. The method of claim 2, wherein the constant speed compressor, Geothermal air-conditioning system, characterized in that it is selectively used depending on the number of the indoor unit number of cooling or heating of the plurality of indoor units required. The method of claim 2, wherein the constant speed compressor, An air conditioning system using geothermal heat, characterized in that additionally operated when the load capacity is increased and can not afford the load only by the inverter compressor. The method according to any one of claims 2 to 4, Between the constant speed compressor and the inverter compressor, the constant pressure compressor and the inverter compressor is characterized in that the uniform oil pipe for communicating with each other is installed.

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