KR20040027535A - Heating and cooling system using brine circulation - Google Patents

Abstract

PURPOSE: A cooling and heating system by using a heat medium is provided to defrost an air-cooling heat exchanger quickly and easily in using as a heat pump by adding a heat medium circulating circuit to a refrigerant circulating circuit, and to improve efficiency without changing the refrigerant circulating cycle by exchanging and transmitting heat with using the heat medium. CONSTITUTION: A cooling and heating system comprises a refrigerant circulating system having a refrigerant circulating circuit or more including an evaporator(1), a compressor(2), a condenser(3) and an expansion valve(7); a first heat medium circulating circuit(100) as a closed circuit circulating the evaporator and an air-cooling heat exchanger(40); a second heat medium circulating circuit(200) as a closed circuit circulating the condenser and an indoor unit(60); a third heat medium circulating circuit(300) as a closed circuit circulating the condenser and the air-cooling heat exchanger; a fourth heat medium circulating circuit(400) as a closed circuit circulating the evaporator and the indoor unit; and two pumps(P1,P2) or more installed in the first, second, third and fourth heat medium circulating circuits and selectively operated.

Description

Heating and cooling system using heat medium {HEATING AND COOLING SYSTEM USING BRINE CIRCULATION}

The present invention relates to a cooling and heating system using a heat medium, and more particularly, to form a heat medium circulation circuit in an evaporator and a condenser to quickly remove frost when using the function of a heat pump in a cooling and heating system, and to perform any function of cooling or heating. The present invention relates to a heating and cooling system using a heat medium that does not reduce the efficiency of the heating and cooling system even when using.

Heat pump can be used to heat in winter and cool in summer. This method is widely used and very economical. First, it is very effective in saving energy because of its high efficiency. Second, the initial capital investment is small because no two facilities are used for cooling and heating. Despite these advantages, the reasons for their lack of widespread depend on climate.

Before explaining the reason, the heat pump cycle is briefly described. The heat pump cycle is a vapor compression refrigeration cycle. In the vapor compression cycle, the gas refrigerant compressed in the compressor is condensed in the condenser, passes through the bulging valve, and a pressure drop occurs, so that a part of the refrigerant is evaporated and cooled. The remaining refrigerant absorbs heat from the surroundings when it evaporates in the evaporator and cools the surroundings. The low pressure gas refrigerant is returned to the compressor and compressed. When the gas refrigerant condenses in the condenser of such a vapor compression cycle, heat of vaporization is dissipated around, and when this heat is used, this cycle becomes a heat pump cycle. On the other hand, when the liquid refrigerant evaporates in the evaporator, it absorbs the heat of vaporization around and consequently cools the surroundings. Using this cooling phenomenon results in a freezing cycle. Therefore, a machine capable of carrying out a vapor compression cycle has a basic structure for heating and cooling.

Heat pumps are very energy efficient because they can achieve 3 to 5 grades, depending on the operating conditions. The reason for the high coefficient of performance in the heat pump cycle is that as the gas refrigerant evaporates in the evaporator, the heat is transferred and the energy of the refrigerant is increased while the energy of the refrigerant is increased. Because. When the evaporator absorbs heat, there is no special heat source, so heat is supplied from the atmosphere, causing moisture in the air to freeze on the surface of the evaporator, causing frost. Therefore, the frost of the evaporator lowers the heat transfer function of the evaporator, and thus the heat pump cannot be used.

The problem with frost is very large when the air temperature is -5 ℃ to 5 ℃. However, it is difficult to use heat pumps due to the problem of sex because there is a lot of moisture and temperature in this area in marine climate like Korea.

In addition, in the case of a conventional heat pump / air conditioner, the evaporator is connected to the indoor unit and the condenser is connected to the outdoor unit when the air conditioner is used as a function of the air conditioner. Should be connected to the indoor unit. However, in order to change the position of the indoor unit and the outdoor unit, it is difficult to change the whole structure of the combined heat pump / air conditioner. Therefore, the refrigerant is circulated in the reverse direction to use the evaporator as the condenser and the condenser as the evaporator. It was inefficient to use the device by circulating the refrigerant in the reverse direction due to the different operating temperature.

The present invention has been made to solve the above problems, an object of the present invention is to form a heat medium circulation circuit in the evaporator and condenser to quickly remove the frost when using the function of the heat pump in the cooling and heating system and cooling or heating It is to provide a cooling and heating system using a heat medium that ensures that the efficiency of the heating and cooling system is not degraded even when using any function.

An object of the present invention described above is a refrigerant circulation system having at least one refrigerant circulation circuit formed with an evaporator, a compressor, a condenser, an expansion valve; A first heat medium circulation circuit which is a closed circuit via the evaporator and an air-cooled heat exchanger; A second thermal medium circulation circuit which is a closed circuit via the condenser and an indoor unit; A third heat medium circulation circuit which is a closed circuit via the condenser and the air-cooled heat exchanger; A fourth thermal medium circulation circuit which is a closed circuit via the evaporator and the indoor unit; And two or more selectively operable pumps installed on the first, second, third and fourth thermal medium circulation circuits. .

In order to achieve the above object, a plurality of first opening and closing valves provided in the first column medium circulation circuit and the second column medium circulation circuit; And a plurality of second opening / closing valves installed in the third column medium circulation circuit and the fourth column medium circulation circuit, wherein each of the first, second, third and fourth column medium circulation circuits is the first and the second column circulation circuits. It is preferred that there is a portion sharing with one or more of the second, third and fourth column medium circulation circuits.

In order to achieve the above object, the ice storage tank built-in heat exchanger and the water is stored; A fifth heat medium circulation circuit which is a closed circuit via the evaporator and the ice storage tank; And a sixth column medium circulation circuit which is a closed circuit via the ice storage tank and the indoor unit.

A first heat medium collecting tank and a second heat medium collecting tank installed in the second heat medium circulation circuit for storing the heat medium to achieve the above object; A third heat medium collecting tank and a fourth heat medium collecting tank installed in the fourth heat medium circulation circuit and storing a heat medium; And a controller for controlling the operation of the at least one refrigerant circulation circuit, wherein the first heat medium collecting tank and the third heat medium collecting tank include a temperature sensor, and the controller is connected to the temperature sensor.

In order to achieve the above object, the refrigerant circulation system further comprises an intercooler formed with a level control device and a heat exchanger filled with a refrigerant and controlling the level of the refrigerant, wherein the compressor is composed of a low compressor and a high pressure compressor, The expansion valve is composed of a low pressure expansion valve and a high pressure expansion valve respectively connected to the condenser; Preferably, the low compressor and the high pressure compressor are connected through the intercooler, and the low pressure expansion valve and the condenser are connected through the intercooler.

In order to achieve the above object, a gas dispersion manifold connected to the low compressor and having a plurality of holes is further installed on the bottom of the intercooler, and the heat exchanger of the intercooler includes a fin tube having a plurality of circular outer fins. It is preferable to be formed horizontally installed on the surface of the refrigerant inside.

In order to achieve the above object, the air-cooled heat exchanger is provided with a bundle having a fin tube formed penetrating downwards and formed laterally through the ground, and the angle adjustable louver is installed in the bundle Do.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a schematic circuit diagram of a cooling and heating system using a heat medium according to a first embodiment of the present invention;

2 is a schematic circuit diagram of a cooling and heating system using a heat medium according to a second embodiment of the present invention;

3 is a circuit diagram showing the heat medium circulation of the heating and cooling system using the heat medium according to the third embodiment of the present invention,

4 is a circuit diagram of a refrigerant circulation system of a heating and cooling system using a heat medium according to the first, second and third embodiments of the present invention;

5 is a schematic front view showing an intercooler of a heating and cooling system using a heat medium according to an embodiment of the present invention;

6 is a schematic side view showing an intercooler of a heating and cooling system using a heating medium according to an embodiment of the present invention;

7 is a front view showing a fin tube used in an intercooler of a heating and cooling system using a heat medium according to an embodiment of the present invention;

8 is a perspective view showing an air-cooled heat exchanger of a cooling and heating system using a heat medium according to an embodiment of the present invention.

Explanation of the Main References

1: Evaporator 2: Compressor

3: condenser 5: auxiliary electric heater

6: Receiver tank 7: Expansion valve

20: Intercooler 40: Air-cooled heat exchanger

Hereinafter, the configuration of a heating and cooling system using a heat medium according to a preferred embodiment of the present invention will be described in detail. The same reference numerals are used for the same members.

1 is a schematic circuit diagram of a cooling and heating system using a heat medium according to a first embodiment of the present invention. As shown in FIG. 1, a heating and cooling system using a heat medium according to a first embodiment of the present invention includes an evaporator 1, a compressor 2, a condenser 3, and an expansion valve 7, and a refrigerant circulates. A first heat medium circulation circuit comprising a refrigerant circulation system comprising a refrigerant circulation circuit, an air-cooled heat exchanger (40), and an indoor unit (60), and a closed circuit in which the heat medium circulates through the evaporator (1) and the air-cooled heat exchanger (40). 100, the second heat medium circulation circuit 200, which is a closed circuit via the condenser 3 and the indoor unit 60, the third heat medium circulation circuit 300, which is a closed circuit via the condenser 3 and the air-cooled heat exchanger 40 And a fourth thermal medium circulation circuit 400 which is a closed circuit via the evaporator 1 and the indoor unit 60.

The first heat medium circulation circuit 100 is provided with a first opening / closing valve V1 which is a solenoid valve for opening or closing a circuit on the circuits on both sides of the evaporator 1 or the air-cooled heat exchanger 40, respectively. The first pump (P1) for circulating the heat medium on one side of the circuit) is provided.

In the second heat medium circulation circuit 200, a first opening / closing valve V1 is formed on circuits on both sides of the condenser 3 and the indoor unit 60, and an auxiliary electric heater 5 is formed on the circuit of one side of the condenser 3. ) Is installed and the second pump (P2) is installed on the circuit of the other side.

In the third heat medium circulation circuit 300, a second open / close valve V2 is installed on circuits on both sides of the air-cooled heat exchanger 40 or the condenser 3, respectively.

In the fourth thermal medium circulation circuit 400, a second opening / closing valve V2 is provided on circuits on both sides of the evaporator 1 or the indoor unit 60, respectively.

The first column medium circulation circuit 100 includes first, second, third and fourth branch portions D1, D2, D3, and D4 connected to the other heat medium circulation circuits 200, 300, and 400, and The two-column medium circulation circuit 200 includes fifth, sixth, seventh, and eighth branch portions D5, D6, D7, and D8. The portion of the circuit between the first and fourth branch portions D1 and D4 is shared by the first column medium circulation circuit 100 and the fourth column medium circulation circuit 400, and the second and third branch portions D3. The circuit between (D2, D3) is shared by the first column medium circuit 100 and the third column medium circuit 300, and the circuit between the fifth and eighth branches D5, D8 is the second column medium circulation. The circuit 200 and the third column medium circulation circuit 300 share the circuit between the sixth and seventh branch units D6 and D7 and the second column medium circulation circuit 200 and the fourth column medium circulation circuit 400. To share.

The heat medium used is a line of 50% water and 50% ethylene glycol.

2 is a schematic circuit diagram of a cooling and heating system using a heat medium according to a second embodiment of the present invention. As shown in FIG. 2, a refrigerant circulation system and an air-cooled heat exchanger 40 including an evaporator 1, a compressor 2, a condenser 3, and an expansion valve 7 and a refrigerant circulation circuit through which refrigerant is circulated. And a first heat medium circulation circuit 100 and a condenser 3 including a plurality of indoor units 60 and an ice storage tank 70, which are closed circuits in which a heat medium circulates via the evaporator 1 and the air-cooled heat exchanger 40. ) And the second thermal medium circulation circuit 200, which is a closed circuit via the indoor unit 60, the third thermal medium circulation circuit 300, and the evaporator 1, which are closed circuits via the condenser 3 and the air-cooled heat exchanger 40. Fourth thermal medium circulation circuit 400 which is a closed circuit via the indoor unit 60, the fifth thermal medium circulation circuit 500 which is a closed circuit via the evaporator 1 and the ice storage tank 70, and the ice storage tank 70 and the indoor unit ( And a sixth column medium circulation circuit 600, which is a closed circuit via 60).

The first heat medium circulation circuit 100 is provided with a first opening / closing valve V1 which is a solenoid valve for opening or closing a circuit on the circuits on both sides of the evaporator 1 or the air-cooled heat exchanger 40, respectively. The second pump (P2) is installed on the circuit of one side.

In the second heat medium circulation circuit 200, a first opening / closing valve V1 is formed on circuits on both sides of the condenser 3 and the indoor unit 60, and an auxiliary electric heater 5 is formed on the circuit of one side of the condenser 3. ) Is installed and the first pump P1 is installed on the circuit of the other side.

In the third heat medium circulation circuit 300, a second open / close valve V2 is installed on circuits on both sides of the air-cooled heat exchanger 40 or the condenser 3, respectively.

In the fourth heat medium circulation circuit 400, a fourth open / close valve V4 is installed on a circuit between the evaporator 1 and the indoor unit 60, and a fourth open / close valve V4 is installed on a circuit that passes through the indoor unit 60. And a second opening and closing valve (V2) is installed.

In the fifth column medium circulation circuit 500, a third opening / closing valve V3 is installed on the circuit between the ice storage tank 70 and the evaporator 1.

The sixth column medium circulation circuit 600 is the same path as the fourth column medium circulation circuit 400, but there is a difference in that the refrigerant circulation system is not operated.

The first column medium circulation circuit 100 includes first, second, third, fourth and fifth branch portions D1, D2, D3, which are connected to other thermal medium circulation circuits 200, 300, 400, 500, and 600. D4 and D5, and the second column medium circulation circuit 200 includes sixth, seventh, eighth, and ninth branch units D6, D7, D8, and D9, and the fourth column medium circulation circuit 400 ) Has a tenth branch portion (D10). The portion of the circuit between the second and third branch portions D2 and D3 is shared by the first column medium circulation circuit 100 and the third column medium circulation circuit 300, and the sixth and ninth branch portions D6, The circuit between D9) is shared by the second column medium circulation circuit 200 and the third column medium circulation circuit 300, and the circuit between the seventh and eighth branch portions D7 and D8 is shared by the second column medium circulation circuit 200. ) And the fourth column medium circulation circuit 400 are shared, and the circuit between the first and fourth branch units D1 and D4 is shared by the first column medium circulation circuit 100 and the fourth column medium circulation circuit 400. The circuit between the first and fifth branch units D1 and D5 is shared by the first column medium circuit 100 and the fifth column medium circuit 500, and the fifth and tenth branch units D5 and D10 are shared. The circuit between the fourth column medium circulation circuit 400 and the fifth column medium circulation circuit 500 is shared. The sixth column medium circulation circuit 600 shares all parts with the fourth column medium circulation circuit 400.

3 is a circuit diagram showing the heat medium circulation of the heating and cooling system using the heat medium according to the third embodiment of the present invention. As shown in FIG. 3, a cooling and heating system using a heat medium according to a third embodiment of the present invention includes an evaporator 1, a compressor (not shown), a condenser 3, and an expansion valve (not shown), and a refrigerant. A closed circuit in which the heat medium circulates through the evaporator 1 and the air-cooled heat exchanger 40, comprising a refrigerant circulation system comprising a plurality of refrigerant circulation circuits, an air-cooled heat exchanger 40, and a plurality of indoor units 60. The second heat medium circulation circuit 100, the closed circuit passing through the condenser 3 and the indoor unit 60, the second heat medium circulation circuit 200, the closed circuit passing through the condenser 3 and the air-cooled heat exchanger 40 And a third column medium circulation circuit 300 and a fourth column medium circulation circuit 400 which is a closed circuit via the evaporator 1 and the indoor unit 60.

The first heat medium circulation circuit 100 is provided with a first opening / closing valve V1, which is a solenoid valve for opening or closing a circuit on both circuits of the air-cooled heat exchanger 40, and a circuit on one side of the evaporator 1, respectively. A temperature sensor 65 is provided on the top, and a first heat medium collecting tank T1 for storing the heat medium and a third pump P3 for circulating the heat medium are installed, and a fourth pump is provided on the circuit of the other side of the evaporator 1. P4 and the second heat medium collecting tank T2 are installed. The second heat medium collection tank T2 includes a first inlet 81, a second inlet 82, and an outlet 83.

In the second heat medium circulation circuit 200, first opening / closing valves V1 are formed on circuits on both sides of the indoor unit 60, and a temperature sensor 66 and an auxiliary heater ( 88 and a third heat medium collecting tank T3 and a first pump P1 for storing the heat medium, and a second pump P2 for circulating the heat medium on the circuit of the other side of the condenser 3, and the third pump. Four-row media collection tank (T4) is installed. The fourth heat medium collecting tank T4 includes a first inlet 84, a second inlet 85, and an outlet 86.

The third thermal medium circulation circuit 300 is provided with second opening and closing valves V2 on circuits on both sides of the air-cooled heat exchanger 40, respectively, and the second thermal medium circulation circuit 200 and the third and fourth thermal medium collecting tanks. The first and second pumps P1 and P2 are shared with T3 and T4.

In the fourth column medium circulation circuit 400, a second opening / closing valve V2 is installed on circuits on both sides of the indoor unit 60, and the first column medium circulation circuit 100 and the first and second column medium collecting tanks T1 are provided. , T2) and third and fourth pumps P3 and P4 are shared.

The first column medium circulation circuit 100 includes first, second and third branch portions D1, D2, and D3 connected to other heat medium circulation circuits, and the second column medium circulation circuit 200 includes fourth and third branches. And fifth and sixth branch portions D4, D5, and D6. The portion of the circuit between the second and third branch portions D3 (D2, D3) is shared by the first column medium circulation circuit 100 and the third column medium circulation circuit 300, and the fourth column medium collection tank T4. ) And the fourth branch unit D4 share the circuit between the second column medium circulation circuit 200 and the third column medium circulation circuit 300, and the second column medium collection tank T2 and the first branch unit D1. The circuit between the first column medium circulation circuit 100 and the fourth column medium circulation circuit 400 is shared, and the circuit between the fifth and sixth branch portions is the second column medium circulation circuit 200 and the fourth column medium circulation circuit. 400 shares.

4 is a circuit diagram of a refrigerant circulation system of a cooling and heating system using a heat medium according to the first, second and third embodiments of the present invention. As shown in Figure 4, the refrigerant circulation system of the heating and cooling system using the heat medium according to the present invention is an evaporator (1), a compressor, a condenser (3), a receiver tank (6) for gas refrigerant storage, expansion valve (7) And an intercooler 20. The compressor consists of a low compressor 2a and a high pressure compressor 2b, and the expansion valve consists of a low pressure expansion valve 7a and a high pressure expansion valve 7b.

Between the evaporator 1 and the condenser 3, a low compressor 2a, an intercooler 20, and a high pressure compressor 2b are sequentially installed. A first branch D1 is formed on the circuit between the evaporator 1 and the low compressor 2a, and a second branch D2 is formed on the circuit between the intercooler 20 and the high pressure compressor 2b. A circuit connecting the first branch portion D1 and the second branch portion D2 is formed.

On the circuit passing through the receiver tank 6, a third branch portion D3 is formed, and a low pressure expansion valve circuit portion 11 and a high pressure expansion valve branched from the third branch portion D3 and connected to the low pressure expansion valve 7a. A high pressure expansion valve circuit portion 12 connected to 7b is formed. The low pressure expansion valve circuit 11 is connected to the low pressure expansion valve 7a via the intercooler 20, branched from the fifth branch D5 to the low pressure expansion valve circuit 11, and separately connected to the intercooler 20. The refrigerant supply unit 15 is formed. The circuit portions passing through the low pressure expansion valve 7a and the high pressure expansion valve 7b are combined in the fourth branch portion D4 and connected to the evaporator 1.

5 is a schematic front view showing an intercooler of a heating and cooling system using a heating medium according to an embodiment of the present invention, Figure 6 is a schematic side view showing an intercooler of a cooling and heating system using a heating medium according to an embodiment of the present invention, 7 is a front view showing a fin tube used in an intercooler of a heating and cooling system using a heat medium according to an embodiment of the present invention. As shown in FIGS. 5 to 7, the intercooler 20 includes an inlet 22 and an outlet. 25 is formed and includes a cylindrical housing 26 filled with a refrigerant, a gas dispersion manifold 21, a heat exchanger 30, and a refrigerant level control device 19.

At the lower end of the housing 26, a gas dispersion manifold 21 having a plurality of holes 23 is provided.

The heat exchanger 30 is composed of a fin tube 31 installed at the lower portion of the inner side of the housing 26 and connected to the low pressure expansion valve circuit portion 11. The fin tube 31 of the heat exchanger is disposed horizontally with the surface of the refrigerant filled in the intercooler 20, and is arranged so that the number of the fin tubes 31 increases as it goes upward.

The refrigerant supply unit 15 connected to the low pressure expansion valve circuit unit 11 is formed to penetrate through one side of the housing 26 of the intercooler 20, and the refrigerant supply unit 15 has a buoy to flow path of the refrigerant supply unit 15. A coolant level control device 19 for opening and closing the valve is installed, and a pressure reducing unit 16 having a reduced internal diameter is formed at the end of the coolant supply unit 15.

The fin tube 31 has a circular outer fin 34 formed on the outer circumferential surface of the tube 33, and the plurality of fin tubes 31 are connected to the U-shaped tube 36.

8 is a perspective view showing an air-cooled heat exchanger of a cooling and heating system using a heat medium according to an embodiment of the present invention. As shown in FIG. 8, the air-cooled heat exchanger 40 used in the cooling and heating system according to the present invention includes a bundle in which a housing 41 having a lower surface is opened and a plurality of fin tubes 31 respectively installed at both sides thereof. 45), the blowing fan 50 is installed on the bundle 45 and is installed on the outside of the bundle 45 is configured to include a louver 55 for guiding air communication.

The housing 41 has a pair of side and top surfaces blocked, the bottom and the other side of the pair is open, and the lower end of the housing 41 is provided with a leg 43 to space the ground.

The bundle 45 has inlet manifolds 46 and outlet manifolds (not shown) on both sides, respectively, and two blowing fans 50 are provided on one surface thereof. The fin tubes 31 of the bundle 45 are formed with outer fins on the outer circumferential surface of the tube, like the fin tubes 31 used for the intercooler 20, and the fin tubes 31 are formed by the U-tube 36. Connected. On the outer side of the bundle 45, a plurality of louvers 55 are installed to enable angle adjustment.

Hereinafter will be described in detail the effect of the cooling and heating system using the heat medium according to the preferred embodiment of the present invention.

First, the effect of the cooling and heating system using the heat medium according to the first embodiment of the present invention will be described. The circuit of the coolant and the circuit of the heat medium are shown to be distinguished, and the circuit of the coolant will be described briefly since it will be described later.

First, the heat pump function will be described. The gas refrigerant compressed by the compressor (2) condenses in the condenser (3) and transfers heat of condensation to the heat medium. The heat medium flows to the indoor unit 60 in the room by the second pump P2 and performs heat exchange with the indoor air to heat the indoor air, and then returns to the condenser 3 and is heated again. At this time, the second open / close valve V2 is closed and the first open / close valve V1 is open (second heat medium circulation). The liquid refrigerant condensed in the condenser (3) passes through the expansion valve (7) and when the pressure drops, some of the refrigerant evaporates and at the same time the remaining liquid refrigerant is cooled, and the liquid refrigerant takes heat away from the heat medium in the evaporator (1). The evaporation leads to a higher energy state than the liquid refrigerant and returns to the compressor 2. On the other hand, the heat medium transfers heat to the refrigerant as it passes through the evaporator 1 and the temperature is lowered. This low temperature heat medium flows to the air-cooled heat exchanger 40, and receives heat from the atmosphere. The heat medium whose temperature has risen is returned to the evaporator 1 again by the first pump P1 (first thermal medium circulation). At this time, the second open / close valve V2 is closed and the first open / close valve V1 is open.

In this case three cycles are made. First, a refrigerant compression cycle, which is a vapor compression cycle, is passed through the compressor (2). Second, the heat medium circulates between the condenser 3 and the indoor unit 60 by the second pump P2 (second heat medium circulation). Finally, the heat medium circulates between the evaporator 1 and the air-cooled heat exchanger 40 by the power of the first pump P1 (first heat medium circulation). As a result of these three circulations, the heat medium receives heat from the air and transfers it to the refrigerant, and the gas refrigerant with high energy state comes to the condenser 3 after the energy is increased in the process of adiabatic compression in the compressor (2). As heat is transferred, the temperature of the heat medium increases. The heat medium whose temperature has risen functions to warm indoor air in the indoor unit 60.

At this time, the process of removing the frost generated in the air-cooled heat exchanger 40 to take heat from the air is as follows. The operation of the compressor 2 and the first pump P1 is stopped, the first open / close valve V1 is closed, and the second open / close valve V2 is opened. When the second pump P2 is operated, the high temperature heat medium in the condenser 3 circulates between the air-cooled heat exchanger 40 and the condenser 3 (third heat medium circulation). At this time, the secondary electric heater next to the outlet of the condenser 3 according to the atmospheric temperature is turned on to further increase the heat medium temperature to effectively remove frost in a short time. This operation enables heat pump operation even in extreme adverse weather conditions.

Looking at the above process in detail. First, let's look at the operation of the system in heat pump mode for heating.

The refrigerant flows inside the condenser 3 and the evaporator 1 and heat medium flows outside. The heat medium passes through the condenser 3 at a flow rate of 3 kg / s, enters 50 ° C., rises to 55 ° C., flows into the indoor unit 60, heats, and goes to the condenser 3 while the temperature falls to 50 ° C. Come back. At this time, the refrigerant enters the condenser 3 as a gas of 111.3 ° C and becomes a liquid 58.1 ° C.

In the tube inside the evaporator 1, the liquid refrigerant evaporates into a gas refrigerant, and the heat medium flows outside the tube. The heat medium enters -14 ° C to lose heat and becomes -17 ° C to go to the air-cooled heat exchanger 40 to receive heat from the air.

In the air-cooled heat exchanger, air enters -9 ° C and is discharged to -12 ° C, and the heat medium flowing through the air-cooled heat exchanger 40 enters -17 ° C, receives heat from the air, and the temperature rises to -14 ° C. Go to 1) and transfer heat to the refrigerant. As described in detail about the circulation of the heating medium and the refrigerant, the entire cycle is supplied with 25,000 kcal / h of heat in the atmosphere of -9 ° C and sent 55 ° C of heat medium to the indoor heat exchanger to obtain 44,700 kcal / h. Heat radiation to heat. This pumps heat from low to high temperatures. The power used for this heat pumping is mainly consumed by the compressor 2 and the remaining amount is consumed by the circulation pump and the blower.

Hereinafter, the case of using the cooling function. In the present invention, it is very easy to change the function of the heat pump and the cooling function. In the cooling mode, the second open / close valve V2 is closed and the first open / close valve V1 is opened. In the heat pump mode, the evaporator 1 is connected to the air-cooled heat exchanger 40 to absorb heat, and the condenser 3 is connected to the indoor unit 60 so that the heat generated from the condenser 3 is used for heating. In the cooling mode, the condenser 3 is connected to the air-cooled heat exchanger 40 to radiate heat to the atmosphere (third heat medium circulation). The evaporator 1 is connected to the indoor unit 60 to cool the indoor air by flowing the low temperature heat medium to the indoor unit 60 (4th thermal medium circulation). In this way, not only the heating and cooling functions can be easily performed but also the energy efficiency is high.

Hereinafter, the effect of the cooling and heating system using the heat medium according to the second embodiment of the present invention will be described.

In summer, power supply is difficult due to the use of the cooling function during the day. During the day, peak peaks in power use occur, while surplus power problems occur at night. As a way to alleviate this bad power usage pattern, it uses the cooling method obtained by making ice by nighttime idle power and thawing by daytime. Since the details of the ice heat storage method are described in Patent Application No. 2002-76796, only those related to the present invention will be described herein.

As shown in FIG. 2, the ice storage tank 70 does not participate in the heat pump mode and participates only in the cooling mode. In the late night ice making cycle, the first open / close valve V1 and the fourth open / close valve V4 are closed, and the second open / close valve V2 and the third open / close valve V3 are open. The heat medium circulates between the condenser 3 and the air-cooled heat exchanger 40 by the first pump P1 and radiates heat generated by the condenser 3 to the atmosphere (third heat medium circulation). The heat medium cooled in the evaporator 1 (which acts as a chiller) by the second pump P2 flows to the ice storage tank 70 and in the process of making ice outside the tube, the temperature rises and then returns to the evaporator 1 again. Ice is coming and going (5th heat medium circulation). In the thawing cycle, the first open / close valve V1 and the third open / close valve V3 are closed, and the second open / close valve V2 and the fourth open / close valve V4 are opened. The circulation path circulates through the evaporator 1 (chiller), the ice storage tank 70 and the indoor unit 60 (fourth thermal medium circulation, sixth thermal medium circulation). At this time, the refrigerant circulation system may or may not operate (fourth thermal medium circulation) or may not be (6th thermal medium circulation). If it does not operate, the ice storage tank 70 bears the energy required for cooling alone, and during operation, the refrigerant circulation system and the ice storage tank 70 share.

The specific ice making process is as follows. The evaporator 1 serves as a chiller to make the heat medium low temperature and send it to the ice storage tank 70 to make ice. The temperature of the heat medium entering the chiller (evaporator 1) from the ice storage tank 70 continuously varies depending on the amount of ice making in the ice storage tank 70. Therefore, the design is conservative under the worst conditions. The conservative value is that the temperature of the sub-line coming into the chiller is -3 ° C and is cooled to -6.7 ° C in the chiller and enters the ice storage tank 70 while the temperature rises and returns to the chiller. At this time, the ice tank 70 loses heat at 30,000 kcal / h and generates about 380 kg of ice every hour. In the condenser 3, the heat medium obtains heat when the refrigerant condenses. The temperature of the heat medium entering the condenser 3 is 40 ° C., and after the temperature is raised, the outlet temperature is 45.4 ° C., which goes to the air-cooled heat exchanger 40 to release heat to the atmosphere, and the temperature reaches 40 ° C., and returns to the condenser 3.

When using the heat pump function, the second, third and fourth open / close valves V2, V3, and V4 are closed, and only the first open / close valve V1 is opened. Operation to the heat pump function is similar to that of the first embodiment.

The effect of the cooling and heating system using the heat medium according to the third embodiment of the present invention will be described.

In large buildings with large capacity for cooling and heating, a centrally controllable system is needed. A simple and highly reliable system of this is shown in FIG. 3. The heating medium circulation method is the same in the above-described principles, but differs in specific points. Some parts of the refrigerant circulation system are omitted for simplicity of the drawings. The freezer represents three compressors (not shown), three evaporators (1) and three condensers (3), and six indoor units (60). However, only one air-cooled heat exchanger 40 is provided. This is very important. The reason is that when operating in heat pump mode, not only the defrosting process is required but also it must be performed in a short time. As emphasized many times, the operation of the heat pump in humid winter weather like Korea's climate is because the effective snow removal process is a measure of success. Although not shown, the compressor 2 has a low compressor 2a (Buster) and a high pressure compressor 2b in a pair of three, each of which is described later. However, depending on the capacity can be a large number.

When acting as a heat pump, the heating medium is circulated by four pumps. At this time, the second open / close valve V2 is closed and the first open / close valve V1 is open. When the gaseous refrigerant condenses in the condenser 3, the heat medium which received the heat of condensation is heated. The heat medium from each condenser 3 flows to the third heat medium collection tank T3. The first pump P1 flows to the indoor unit 60 to warm the air in the room, and the heat medium is cooled and collected in the fourth heat medium collection tank T4. The heat medium forms a circulation path by which the second pump P2 flows back to the condenser 3 (first heat medium circulation circuit 100). Up to now, the heat medium circulation path of the heat dissipation process has been described. The following describes a circuit that absorbs heat from air. When the refrigerant evaporates in the evaporator 1, the heat medium provides heat of vaporization and cools it. The refrigerant and the heat medium exchange heat as much as the heat of vaporization of the refrigerant. The cooled heat medium is collected in the first heat medium collection tank T1 and the low temperature heat medium is sent to the air-cooled heat exchanger 40 by the third pump P3. At this time, since the temperature of the heat medium is lower than the temperature of the air, heat is absorbed from the air and the temperature of the heat medium increases. The heat medium obtained from the air-cooled heat exchanger 40 flows to the second heat medium collecting tank T2 and returns to the evaporator 1 by the fourth pump P4 to transfer heat to the refrigerant (second heat medium circulation). . Looking at the first and second heat medium circulation process together, the heat is obtained from the air and transferred to the refrigerant, the refrigerant is transferred to the heat medium again, and the heat medium heats indoor air. At the macro level, the function of pumping heat from a low temperature to a high temperature is handled by the compressor 2.

It was mentioned that the success or failure of using a heat pump is an efficient and reliable defrosting method. Defrosting is to remove the frost formed on the outside of the tube by flowing a high temperature heat medium passing through the condenser 3 to the inside of the air-cooled heat exchanger (40). At this time, the first open / close valve V1 is closed and the second open / close valve V2 is open. A power source is connected to the auxiliary electric heater 5 in the third heat medium collecting tank T3. Only the second pump P2 and the first pump P1 are operated, and everything is stopped. By continuing this cycle until the frost is completely removed, it is simply and reliably removed.

The following describes the heat carrier circulation in the cooling function. In the heat pump mode, the air-cooled heat exchanger 40 is connected to the evaporator 1 and the heat medium circulation path is made such that the condenser 3 is connected to the indoor unit 60. However, in the cooling mode, the evaporator 1 is the indoor unit. In connection with 60, the indoor air is cooled (the fourth heat medium circulation), and the condenser 3 is connected with the air-cooled heat exchanger 40 to release heat to the atmosphere (third heat medium circulation). For this circulation, the second open / close valve V2 is closed and the first open / close valve V1 is open. Temperature control depends on heating and cooling functions. In the heating function, the controller determines how many refrigerant circulation circuits are to be operated and how many are to be stopped according to the temperature measurement of the temperature sensor 66 installed in the third heat medium collecting tank T3 collecting the high temperature heat medium. On the other hand, in the cooling mode, the number of refrigerant circulation circuits to be operated is determined according to the instruction of the temperature sensor 65 attached to the first heat medium collecting tank T1 for collecting the low temperature heat medium. This simple and very easy temperature control is an advantage and feature of this system.

Hereinafter will be described the operation and effect of the refrigerant circulation system of the heating and cooling system using a heat medium according to a preferred embodiment of the present invention.

The circulation of the refrigerant, which is the relative fluid of the heat medium that exchanges heat with the heat medium, is a vapor compression cycle. As shown in Figure 4, the refrigerant circulation system of the cooling and heating system according to the present invention is common to all of the above-described embodiments, it is simply shown in Figures 1 and 2 and omitted in FIG. First, the refrigerant circulation when operating in the heat pump mode will be described. The refrigerant circulation system includes an intercooler (20), a condenser (3), a receiver tank (6) for gas refrigerant storage, and two coolers for cooling fluid between two compressors (2a, 2b) and two compressors (2a, 2b). Expansion valves 7a and 7b and evaporator 1 are activated. The first and second opening / closing valves V1 and V2 having an opening / closing function only operate the low pressure compressor 2a to operate the refrigeration cycle efficiently in a wide range of temperature ranges from -20 ° C to 5 ° C. And for bypassing the refrigerant when it is not, and used to select one of the low pressure expansion valve circuit part 11 and the high pressure expansion valve circuit part 12. The intercooler 20 serves to cool the gas refrigerant compressed by the low compressor 2a and to supercool the liquid refrigerant before passing through the low pressure expansion valve 7a. When the heating and cooling system operates in the heat pump mode, the saturation vapor pressure is extremely low since the evaporation saturation temperature in the evaporator (1) is lowered to -20 ° C. On the other hand, the saturation temperature of the liquid refrigerant condensed in the condenser 3 may rise to 60 ° C or more. Therefore, since one compressor cannot compress the saturated steam pressure in the evaporator 1 to the saturated steam pressure in the condenser 3, two compressors 2a and 2b are used to perform two-stage compression and high pressure compression. Before the final compression after cooling the refrigerant between the two compressors (2a, 2b). At this time, the first open / close valve V1 is closed and the second open / close valve V2 is open. The gaseous refrigerant is compressed in the high pressure compressor (2b) and then flows to the condenser (3), where it exchanges heat with the heat medium and condenses. The liquid refrigerant flows to the intercooler 20 past the receiver tank 6 for gaseous refrigerant storage. The intercooler 20 is filled with a liquid refrigerant and a gas refrigerant, and the heat exchanger is locked under the surface of the liquid refrigerant. The liquid refrigerant of the intercooler 20 exchanges heat with the liquid refrigerant flowing inside the tube of the heat exchanger 30 to supercool the liquid refrigerant flowing inside the tube. At this time, since the liquid refrigerant in the intercooler 20 is in a saturation state, a part of the liquid refrigerant evaporates when heat is exchanged. In order to make up for the amount of the liquid refrigerant evaporated in this way, the liquid refrigerant passes through the decompression unit 16 at the end of the tube through the refrigerant supply unit 15 branched from the low pressure expansion valve circuit 11 entering the intercooler 20, and part of the liquid refrigerant evaporates. To enter the intercooler 20 in a cooled state. The liquid level is controlled by opening or closing the flow path of the coolant supply unit 15 by the coolant level control device 19. The liquid refrigerant flowing inside the tube is supercooled in the intercooler 20 and then evaporated in the evaporator 1 through the low pressure expansion valve 7a. The low temperature and low pressure gas refrigerant is compressed and superheated in the low temperature compressor (2), and the superheated gas refrigerant flows into the intercooler 20 and is injected under the water surface of the intercooler 20 to rise through the liquid refrigerant in a bubble state. Exit the intercooler 20. At this time, the gas refrigerant is subjected to heat exchange by direct contact with the liquid refrigerant, a part of the liquid refrigerant is evaporated and the temperature of the gas refrigerant is cooled to a saturation temperature. The gas refrigerant cooled to the saturation temperature is compressed in the high pressure compressor (2b) and then circulated to the condenser (3).

Thus, three benefits are obtained by using the intercooler 20. First, when the inlet temperature of the high pressure compressor (2b) decreases, the volume of the gas refrigerant decreases, so that a larger amount of refrigerant can be compressed, thereby increasing the efficiency of the compressor, and secondly, the compressor is prevented from overheating so that the compressor is within an allowable temperature. It can provide a working environment. Third, since the liquid refrigerant condensed in the condenser 3 is supercooled and flows to the expansion valve, only a small amount of liquid refrigerant evaporates when the pressure drops. As a result, a larger amount of liquid refrigerant is evaporated in the evaporator 1, so that the required cooling capacity is obtained even with a small amount of fluid, thereby reducing the power of the low compressor 2a. In addition, the use of the intercooler 20 allows the refrigerant to rise to 110 ° C at the outlet of the high-pressure compressor 2b in a gas of -20 ° C in the evaporator 1. In addition, the condenser (3) has the advantage that can be raised to more than 60 ℃ saturation temperature. By operating with such a large temperature difference, high grade coefficients can be obtained.

When operating in the cooling mode, the second open / close valve V2 is closed and the first open / close valve V1 is opened, and the low pressure compressor 2a does not operate. At this time, the refrigerant does not pass through the intercooler 20 and passes through the high pressure expansion valve 7b. Regardless of the heat pump mode or the cooling mode, the refrigerant always condenses in the same condenser 3 and evaporates in the same evaporator 1. All existing cooling and heating heat pumps had to use four-way valves and three-way valves to change the functions of the evaporator (1) and condenser (3), which not only complicates the control, but also condenser (3) and evaporator. Although the structure of (1) is different, the reliability of the control is influenced, but the heating and cooling system according to the present invention can operate in various operating modes as well as the control method is very simple, so that the control is reliable and the temperature is wide. It has the advantages and characteristics to operate in the area.

Hereinafter will be described the effect of the intercooler used in the refrigerant circulation system of the heating and cooling system using the heat medium according to the present invention.

Looking first at the function required for the intercooler 20, first, the liquid refrigerant should not be mixed with any of the gas refrigerant flowing out of the intercooler 20. When the gas refrigerant containing the liquid refrigerant enters the compressor 2, the compressor 2 is damaged. Secondly, when compressed in the low compressor (2a) it is possible to cool the temperature of the superheated gas refrigerant until the saturation temperature at or near the discharge pressure of the low compressor (2a). In order to increase the efficiency of the compressor 2 at the same time as the outlet temperature of the high pressure compressor 2b is lower than 120 ° C. Third, the temperature of the liquid refrigerant flowing inside the tube of the heat exchanger in the intercooler 20 can also be supercooled to be close to the temperature of the gas refrigerant. This is because the greater the subcooling, the higher the efficiency of the cycle. Finally but most importantly, there must be controls to keep the liquid level constant.

The gas dispersion manifold 19 used in the intercooler 20 of the air conditioning and heating system of the present invention has a plurality of holes, so that the gas refrigerant entering the intercooler 20 from the low pressure compressor 2a in the form of bubbles is intercooler 20. The manifold is placed at the bottom to increase the amount of heat exchange by taking advantage of the convection of the liquid as the bubbles rise. In addition, the introduction of bubbles in the form of bubbles rapidly causes the gas in the bubbles to reach a saturation temperature.

The fin tube 31 of the intercooler 20 is arranged to be flush with the surface of the coolant so that the high temperature liquid refrigerant flowing inside the fin tube 31 and the liquid refrigerant filled in the intercooler 20 exchange heat when the intercooler 20 is used. As the liquid refrigerant filled in evaporates, bubbles are generated on the surface of the fin tube 31 and when the bubbles leave the surface, a phenomenon similar to natural convection occurs. This phenomenon promotes heat transfer in order to maximize this. This new intercooler 20 satisfies all three conditions presented above. First, the cross section of the water surface is low, so the velocity of the gas leaving the water surface is low. Second, the gas coming from the low pressure compressor (2a) passes through the liquid in the form of bubbles, and thus goes out to the saturation temperature. Third, not only the high-performance fin tube 31 was used, but also convection in the liquid to maximize the heat transfer between the liquid.

As an example of the implementation, the case of operating for heating purpose in the heat pump mode and connecting with the ice storage tank 70 in the cooling mode will be described. In heat pump mode, the refrigerant used R-22 and absorbs 25,000 Kcal / h of air and heats 44,021 Kcal / h indoors. Electric power usage is required for each 4.5 kW in the low compressor (2a) and 17.6 kW in the high compressor (2b). Specifically, the high pressure compressor 2b compresses the gaseous refrigerant having a pressure of 432.6 kPa and a temperature of -4.2 ° C. to make an overheated state of pressure 2,379.1 kPa temperature of 111.5 ° C. When this superheated gas refrigerant condenses in the condenser 3, it transfers 44,021 kcal / h of heat to the heat medium and becomes a liquid refrigerant. The pore pressure is 2379.1 kPa and the saturation temperature is 59.5 ° C. The flow rate of the liquid refrigerant flowing through the condenser 3 is 948.34 kg / h. The liquid refrigerant having a saturation temperature of 59.5 ° C. is cooled to 8.9 ° C. in the intercooler 20. The liquid refrigerant is therefore supercooled at 50.6 ° C. In the intercooler 20, the liquid refrigerant at 59.5 ° C is cooled to 8.9 ° C, and the gas refrigerant superheated to 33.4 ° C in the low compressor 2a is cooled to -4.2 ° C. The heat absorbed when cooling the gas refrigerant and the liquid refrigerant is used while the liquid refrigerant in the intercooler 20 evaporates to 407.76 kg / h. Therefore, the liquid flow rate flowing to the expansion valve (7a) is the remaining amount 540.58kg / h minus 407.76kg / h, which is the amount evaporated from the intercooler 20 from 948.34kg / h. In the evaporator 1, when the refrigerant evaporates at -20 ° C, the heat medium receives heat corresponding to heat of vaporization. As a result, the enthalpy of the refrigerant increases from 207.1 kJ / kg to 430.3.5 kJ / kg. In the low compressor 2a, the gas refrigerant is compressed so that the pressure increases from 245.3 kPa to 432.6 kPa and the temperature is overheated to 33.4 ° C. The superheated gas is cooled to −4.2 ° C. in the intercooler 20 and then returned to the high pressure compressor 2b, thereby completing the cycle.

Next, look at the cycle of the refrigerant circulation system when operating in the ice heat storage cooling mode, in this case, the evaporator 1 is operated by the evaporation temperature -9 ℃ to make ice. At this time, since the low compressor (2a) does not operate and only the high pressure compressor (2b) operates, the intercooler 20 is not used. Operation of the cycle is similar to that of the heat pump mode, and further explanation is omitted.

Hereinafter will be described in detail the effect of the air-cooled heat exchanger 40 used in the cooling and heating system of the present invention.

The air-cooled heat exchanger has a function of exchanging heat with the heat medium flowing inside the fin tube 31 and the air flowing outside the fin tube 31. When the system is operated in the heat pump mode, the heat medium transfers heat from the air in the air-cooled heat exchanger 40 and transfers it to the refrigerant in the evaporator 1. Therefore, the surface temperature of the heat exchanger is lower than the air temperature. The air contains a certain amount of moisture, and when the air temperature is within -5 ℃ and 5 ℃, a large amount of moisture condenses on the heat transfer surface. More adversely, the moment water or snow containing a lot of moisture comes into contact with the surface, the water turns to ice and the function of the heat exchanger is extremely degraded or the user is impossible.

In the air-cooled heat exchanger 40 used in the present invention, air is introduced from the bottom surface and discharged to the outside by the blower 50 installed inside the bundle 45. The louver 55 installed outside the heat exchanger bundle 45 guides the air in a diagonal direction toward the bottom. The louver 55 prevents rain or snow from directly contacting the heat exchanger surface, even in strong rain or snowstorms.

In addition, the housing of the air-cooled heat exchanger 40 is lifted by a certain height from the ground by the four legs 43, it is possible to minimize or eliminate the coming of snow or raindrops when air is introduced from the bottom.

The air-cooled heat exchanger 40 used in the cooling and heating system of the present invention firstly prevents snow or rain from directly contacting the heat exchanger surface. Second, air rises upwards and sideways within the heat exchanger, minimizing raindrops or snow from following the air and adhering to the heat exchanger surface. Third, when operating in the cooling mode in the summer, the wings of the louver (55) to face upwards so that the hot air is quickly discharged to the outside. The use of the new air-cooled heat exchanger 40 can minimize the formation of frost on the heat exchanger surface, which is the biggest problem in heat pump operation.

In the cooling and heating system of the present invention, since the valve device can change the direction of circulation of the heat medium, and thus does not switch the role of the evaporator 1 and the condenser 3 of the heat pump cycle in achieving the heat pump function and the cooling function. The efficiency of the heat pump cycle does not decrease.

The reason why the efficiency of the compressor 2 is increased when the inlet temperature of the compressor 2 is low is that PV = nRT increases the temperature when the compressor 2 increases the pressure. However, the compressor 2 has a limit temperature. In addition, when the inlet temperature is high, the fluid flowing into the compressor 2 becomes bulky relative to the mass, and the compressor 2 compresses a small amount of fluid with the same energy. Therefore, since the efficiency of the compressor 2 can be seen to be low, it is preferable that the inlet temperature of the compressor 2 is low.

In the preferred embodiment of the present invention, the blowing fan 50 of the air-cooling exchanger is installed on opposite sides of the housing, respectively, but the present invention is not limited thereto, and the blowing fan 50 may be formed on the lower surface of the housing.

According to the air-conditioning and heating system using the heat medium according to the preferred embodiment of the present invention having the configuration as described above, when using the heat pump function of the air-conditioning system can quickly and simply remove the frost generated in the air-cooled heat exchanger that exchanges heat with the evaporator. Therefore, the heat pump can be used even in areas where there is a lot of moisture in the air.

The cooling and heating system of the present invention exchanges heat with the refrigerant using a heat medium, and transfers and absorbs heat to an indoor unit or an air-cooled heat exchanger through the heat medium, and thus does not need to change the refrigerant circulation cycle in either the heating mode or the cooling mode. This will be nice.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (7)

A refrigerant circulation system including one or more refrigerant circulation circuits including an evaporator (1), a compressor (2), a condenser (3), and an expansion valve (7); A first heat medium circulation circuit 100 which is a closed circuit via the evaporator 1 and the air-cooled heat exchanger 40; A second heat medium circulation circuit 200 which is a closed circuit via the condenser 3 and the indoor unit 60; A third heat medium circulation circuit 300 which is a closed circuit via the condenser 3 and the air-cooled heat exchanger 40; A fourth thermal medium circulation circuit 400 which is a closed circuit via the evaporator 1 and the indoor unit 60; And Comprising two or more pumps (P1, P2, P3, P4) selectively operable to be installed on the first, second, third and fourth column medium circulation circuit (100, 200, 300, 400) Heating and cooling system using a heat medium characterized in that. The method of claim 1, Further comprising a plurality of opening and closing valves (V1, V2, V3, V4) installed in the first, second, third and fourth column medium circulation circuit (100, 200, 300, 400), Each of the first, second, third and fourth column medium circulation circuits 400 has a portion shared with at least one of the first, second, third and fourth column medium circulation circuits 400. Air-conditioning system using heat medium to say. The method of claim 1, Ice storage tank (70) containing a heat exchanger and the water is stored; A fifth heat medium circulation circuit 500 which is a closed circuit via the evaporator 1 and the ice storage tank 70; And And a sixth thermal medium circulation circuit (600), which is a closed circuit passing through the ice storage tank (70) and the indoor unit (60). The method of claim 1, A first heat medium collecting tank T1 and a second heat medium collecting tank T2 installed in the second heat medium circulation circuit 200 to store the heat medium; A third heat medium collecting tank (T3) and a fourth heat medium collecting tank (T4) installed in the fourth heat medium circulation circuit (400) to store the heat medium; And Further comprising a controller for controlling the operation of the at least one refrigerant circulation circuit, The first heat medium collecting tank T1 and the third heat medium collecting tank T3 include temperature sensors 65 and 66, and the controller is connected to the temperature sensors 65 and 66. Air conditioning system used. The method according to any one of claims 1, 3 and 4, The refrigerant circulation system, And an intercooler 20 having a refrigerant filled therein and a level control device 19 for controlling the level of the refrigerant and a heat exchanger formed therein. The compressor 2 comprises a low compressor 2a and a high pressure compressor 2b, and the expansion valve 7 is a low pressure expansion valve 7a and a high pressure expansion valve 7b respectively connected to the condenser 3. Consisting of; The low compressor (2a) and the high pressure compressor (2b) is connected via the intercooler 20, the low pressure expansion valve (7a) and the condenser (3) is characterized in that connected via the intercooler (20). Heating and cooling system using heat medium. The method of claim 5, wherein On the bottom of the intercooler 20 is further provided with a gas dispersion manifold 21 connected to the low compressor (2a) and formed with a plurality of holes 23, The heat exchanger of the intercooler 20 is a heating and cooling system using a heat medium, characterized in that the fin tube 31 having a plurality of circular outer fins 34 is installed horizontally on the surface of the refrigerant inside the intercooler 20. . The method according to any one of claims 1, 3 and 4, The air-cooled heat exchanger 40 is downwardly penetrated and installed away from the ground, and is provided with a fin tube 31 in a lateral direction, and an louver 55 capable of adjusting an angle to the outside of the fin tube 31 is installed. Heating and cooling system using a heat medium characterized in that.