KR101458021B1 - Efficient heat pump systems with preventing adhesion of scale - Google Patents

Abstract

The present invention relates to a heat pump system operated in a cooling, cooling and heating, or heating mode in accordance with an outside air temperature or a seasonal change. The heat pump system includes a four-way valve diverting a flow channel of refrigerant gas; a flow channel diversion valve formed of a three-way valve connected to the four-way valve to change the flow channel of the refrigerant gas; a check valve group consisting of four check valves allowing the flow of liquefied high-pressure refrigerant toward a receiver tank, a second heat exchanger, an evaporator, and an expansion valve; a system control sensor group having at least one among a pressure gauge, a pressure sensor, a temperature sensor, a high-pressure switch, and a flow switch installed at front and rear pipes close to a compressor and a side of an inlet pipe of first and second heat exchangers; a surrounding environment measurement sensor group installed at surroundings or a building of a cooling and heating target region and consisting of an outside air temperature sensor, a humidity sensor, a solar radiation amount sensor, and a thermal storage tank temperature sensor; an input unit receiving data of measurement signals and operation mode conversion equations of the system control sensor group and the environment measurement sensor group; a central processing device processing the input data of the input unit by a given control equation; and an output unit outputting the processed result of the central processing device, wherein an output signal of the output unit includes a control unit controlling the flow channel diversion valve to convert the operation mode.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-efficiency heat pump system,

The present invention relates to a cooling / heating system using a heat pump, and more particularly, to a high-efficiency heat pump capable of preventing an overload of a heat pump during a winter season when the outdoor air temperature is lowered and preventing scale attachment of a heat exchanger and an air- Pump system.

The heat pump cooling system consists of a compressor for circulating refrigerant in the system, a heat exchanger for cooling cold water, an evaporator for cooling the condensed refrigerant, and an indoor unit for supplying cool air to the cooling space. As described above, the conventional heat pump cooling system is designed to cool air out of the indoor unit and to generate heat from the evaporator. However, the heat pump cooling and heating system can also reverse the role of the indoor unit and the evaporator.

Accordingly, in order to reversely reverse the role of the indoor unit and the evaporator, the heat pump cooling and heating system further includes a 4-way valve that can control the flow of the refrigerant, and the refrigerant flow It is possible to selectively perform heating or cooling. At this time, a heat exchanger that performs heat exchange with the cooling / heating water is separately required.

In the heat pump cooling and heating system, a refrigerant for carrying heat is used. The refrigerant is adiabatically compressed from a compressor to a high temperature and a high pressure. The refrigerant in a high temperature and high pressure state adiabatically compressed is used for heating by heat exchange with heating water in a heat exchanger, The high-pressure liquid refrigerant cooled and liquefied under heat exchange is mono-thermal expansion-expanded in the expansion valve, and the gaseous refrigerant of low temperature and low pressure which is thermally expanded is heat-exchanged with the cooling water in the heat exchanger and used for cooling.

That is, the heat exchanger of the heating / cooling heat pump is connected to the condenser and the evaporator to receive the liquid refrigerant of high temperature and high pressure or the gaseous state refrigerant of low temperature and low pressure by the four-way valve that controls the flow of the refrigerant, When the refrigerant supply pipe for supplying the gaseous refrigerant of low temperature or low pressure passes through the inside of the heat exchanger, the cooling / heating water supplied into the duct passing through the inside of the heat exchanger in contact with the refrigerant supply pipe is cooled to a high- Temperature or low-temperature by heat exchange by the low-pressure gaseous refrigerant, and is used for heating, hot water or cooling.

However, it is preferable that the cooling / heating heat pump can be used for cooling and heating in all four seasons. However, if the outdoor air temperature falls below 5 ° C in the winter, the conventional cooling / heating biped pump may be undercooled due to subcooling, , The compressor is overloaded due to the lubrication effect, and the efficiency of the refrigeration cycle is significantly lowered, so that it is practically difficult to use the heating in winter.

In the conventional heat and air-heating heat pump system, water and scale are applied to the heat exchanger of the heat pump and the piping of the heating / cooling system due to the high temperature of the refrigerant and the hot water, and the heat efficiency is deteriorated.

1. Korean Patent Publication No. 10-2013-0055790 (May 31, 2013) 2. Korean Patent Registration No. 10-1177474 (Aug. 21, 2012) 3. Korean Patent No. 10-0874229 (December, 2008) 4. Korean Patent No. 10-1166135 (Jul. 10, 2012) 5. Korean Patent Publication No. 10-2013-013-0134740 (Dec. 10, 2013) 6. Korean Registered Patent No. 10-0793266 (Jan. 3, 2008) 7. Korean Registered Patent No. 10-0496376 (June 10, 2005) 8. Korean Patent No. 10-1042742 (Jun. 10, 2011)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an air conditioning heat pump system capable of maintaining a high efficiency of a heat pump even in winter when the outside air temperature is lowered.

It is another object of the present invention to provide an air conditioner heat pump system that prevents water scaling and scale of a heat exchanger of an air conditioner heat pump and a piping of an air conditioner to maintain thermal efficiency.

In order to accomplish the above object, the present invention provides a refrigerator comprising: a compressor for sucking a refrigerant gas and compressing the refrigerant gas into a high temperature and high pressure refrigerant gas; a first heat exchanger for producing hot water by heat exchange with high pressure refrigerant gas, A high-temperature high-pressure refrigerant gas which is condensed in the first and second heat exchangers or evaporators, a receiver tank for temporarily storing the liquid high-pressure refrigerant condensed in the first and second heat exchangers or evaporators, an expansion valve for expanding the liquid high-pressure refrigerant stored in the receiver tank, An accumulator for preventing the liquid refrigerant from being drawn into the compressor, and a second heat exchanger for producing cold water by heat exchange with vaporized refrigerant gas expanded in the expansion valve.

A four-way valve for switching the flow path of the high-pressure refrigerant gas and the low-pressure refrigerant gas compressed at the high pressure in the compressor so as to switch the flow path of the high- or low-pressure refrigerant gas according to the operation mode; A first switching valve for allowing the liquid high-pressure refrigerant to flow only in the receiver tank side, and a second switching valve for switching the low-pressure refrigerant liquid in the expansion valve to the second heat exchanger A third check valve for allowing only the flow of the low-pressure refrigerant of the expansion valve to flow to the evaporator; and a third check valve for allowing the high-pressure refrigerant gas passing through the second heat exchanger to flow only to the expansion- And a check valve group including a check valve.

In order to change over the operation mode according to the outside air condition or the operation setting condition, a pressure gauge and pressure sensor, a temperature sensor, a high-pressure switch, and a flow switch are connected to the upstream and downstream piping in the vicinity of the compressor and to the inlet and outlet of the first and second heat exchangers. An ambient temperature measurement sensor group which is installed in the vicinity of a heating / cooling target area or in a building and is composed of an ambient temperature, a humidity, a radiation amount sensor and a heat storage tank temperature sensor, and a system control sensor group and environment measurement A central processing unit for calculating input data of the input unit by a given control formula and an output unit for outputting a result of the calculation of the central processing unit, And the sub output signal includes a control section for switching the operation mode by controlling the flow path switching valve .

The first and fourth check valves are connected to each other in a straight line so that the flow directions thereof are opposite to each other, and the second and third check valves can flow in both directions The central portion of the first and fourth check valves is connected to the receiver tank and the central portion of the second and third check valves is connected to the rear end of the expansion valve.

The first and second heat exchangers for producing cooling water for cooling and heating or hot water are preferably plate type heat exchangers which are easy to install and have high heat exchange efficiency. In order to increase the heat exchange efficiency and the cooling and heating efficiency, And the scale preventing means is provided for suppressing the rust and scale of the piping by forming an electrostatic field by the ease of installation and management and the charging effect by the reliable turbulence-jet and galvanic current desirable.

In the cooling operation mode, the high-temperature high-pressure gas refrigerant compressed in the compressor is converted to the four-way valve and the three-way valve of the flow path switching valve and is passed through the evaporator to condense it into the high pressure liquid phase refrigerant. 1 check valve to the receiver tank and vaporized by the expansion valve to phase-change the refrigerant gas to a low-temperature refrigerant gas at 1 to 5 DEG C, and the low-temperature refrigerant gas is heat-exchanged with the second heat exchanger, 9 < 0 > C, and the low-temperature refrigerant gas that has risen through the second heat exchanger is converted into a four-way valve and introduced into the compressor through the accumulator.

In the cooling / heating operation mode, the high-temperature and high-pressure gas refrigerant compressed in the compressor is converted into the four-way valve and the three-way valve of the flow path switching valve and the heat exchanged in the first heat exchanger, Temperature high-pressure gas refrigerant that has passed through the first heat exchanger is introduced into the receiver tank through the first reverse passage of the check valve group, is vaporized in the expansion valve, and is phase-changed into low-temperature refrigerant gas at 1 to 5 ° C And the low-temperature refrigerant gas is heat-exchanged while passing through the second heat exchanger to produce cold water having a temperature on the outgoing side of the second heat exchanger in the range of 5 to 9 DEG C, And then introduced into the compressor through the accumulator.

In the heating operation mode, the high-temperature and high-pressure gas refrigerant compressed in the compressor is converted into a flow path in the four-way valve of the flow path switching valve, passes through the second heat exchanger and is heat-exchanged so that the temperature at the outgoing side of the second heat exchanger is in the range of 50-60 The high pressure refrigerant gas heat exchanged in the second heat exchanger is introduced into the receiver tank through the fourth check valve of the check valve group and is vaporized into low pressure refrigerant gas from the expansion valve. The vaporized low pressure refrigerant gas is introduced into the evaporator, The low-pressure refrigerant gas heat-exchanged in the evaporator is converted into a three-way valve and a four-way valve, and flows into the compressor through the accumulator.

As described above, according to the present invention, the flow path switching valve composed of the three-way valve and the four-way valve and the plurality of check valve groups allowing the refrigerant to flow only in one direction, The cooling and heating operation can be performed with high efficiency in the four seasons cooling and heating as well as in the winter when the outside air temperature falls below 5 캜 in winter by the task solution means for selectively switching the air to pass through the first and second heat exchangers and the evaporator.

In addition, by installing a scale preventing means for suppressing and removing rust and scale of a pipe by forming an electrostatic field by charging effect by turbulence-jet and galvanic current, it is possible to prevent scale of heat exchanger and heating pipe And the thermal efficiency is maintained at a high level.

1 is a configuration diagram of a cooling operation mode of a four-seater high efficiency heat pump system according to an embodiment of the present invention;
2 is a block diagram of a heating / cooling operation mode of a four-seater high efficiency heat pump system according to an embodiment of the present invention.
3 is a configuration diagram of a heating operation mode of a four-seggy high-efficiency heat pump system according to an embodiment of the present invention.

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

As shown in FIGS. 1 to 3, the four-seater high efficiency heat pump system HP of the present invention has the same configuration, but the refrigerant flow path is switched by the flow path switching valve 300 according to the cooling, Or the constituent facilities such as the first heat exchanger 100 and the evaporator VP are put in the idle state according to the operation mode selection.

The basic structure of the four seasons high efficiency heat pump system (HP) of the present invention is a system for producing a high-efficiency heat pump system (HP), which comprises a compressor (CP) for compressing a low-pressure refrigerant gas to high temperature and high pressure, (RV) for temporarily storing the liquid high-pressure refrigerant condensed in the evaporator (VP), and a receiver tank (RV) for temporarily storing the liquid high-pressure refrigerant condensed in the evaporator (VP) An accumulator (AC) that prevents the liquid refrigerant from being drawn into the compressor (CP), an expansion valve (EV) that inflates the liquid high pressure refrigerant stored in the expansion valve And a second heat exchanger (200) for producing cold water by heat exchange with gas.

In this basic configuration, a four-way valve (4-Way) for switching the flow path of the high-pressure refrigerant gas compressed by the compressor (CP) to the high pressure and the circulating low- And a three-way valve (3-Way) connected to the four-way valve (4-Way) for changing the flow path of the high-pressure refrigerant gas or the low-pressure refrigerant gas,

(# 1) allowing the liquid high-pressure refrigerant to flow only to the receiver tank (RV) side and a second reversing valve (# 1) allowing the low-pressure refrigerant liquid of the expansion valve (EV) to flow only to the second heat exchanger A third check valve (# 3) for allowing the low pressure refrigerant liquid of the expansion valve (EV) to flow only to the evaporator (VP) side, a second check valve And a fourth check valve (# 4) permitting only the flow toward the valve (EV) side.

A pressure gauge (PG) and a pressure sensor (PS), a temperature sensor (TS), a high-pressure switch (HP), and a high-pressure switch (HP) are connected to the inlet and outlet pipes of the first and second heat exchangers (100, 200) SW, and a flow switch FS, and a system control sensor group 500 installed in the vicinity of a heating / cooling target area or in a building to measure the outside air temperature T, the humidity H, the irradiation amount sensor RS, And the ambient temperature measurement sensors Tn are mounted or installed.

In addition, an input unit that receives data of measurement signals and operation mode switching conditional expressions of the system control sensor group 500 and the environment measurement sensor group 600, a central processing unit that performs calculation processing of input data of the input unit by a given control formula, And an output unit for outputting an operation result of the central processing unit, and the output unit output signal includes a control unit 700 for switching the operation mode by controlling the flow path switching valve.

The control unit 700 has an input unit for inputting program inputs, operation control parameters, and the like through a keypad or a keyboard and transmitting and receiving analog or digital signals of the sensor groups 500 and 600, A PLC (Programmable Logic Controller) having an apparatus and a central processing unit and an output unit for outputting the calculation result is preferable.

The output unit may be configured to be capable of communicating with a wired or wireless Internet network, and to be able to remotely input and change control variables, operating conditions, and control types through the Internet.

The first and fourth check valves # 1 and # 4 of the check valve group 400 are connected to each other in a straight line so that the flow directions thereof are opposite to each other, and the second and third check valves # 2 and # And the central portion to which the first and fourth check valves (# 1, # 4) are piped is piped to the receiver tank (RV), and the second and third check valves (# 2, # 3) are piped to the rear end of the expansion valve (EV).

In this way, the first and fourth check valves (# 1, # 4) connected in a straight piping so as to face the flow direction allow only the flow of the refrigerant coming from either end of the first and the fourth check valves (# # 4) to the receiver tank (RV).

The piping central portions of the second and third check valves (# 2, # 3) connected to the piping in the straight piping so that the flow direction can flow in both directions are connected to the rear end of the expansion valve (EV) 2 heat exchanger 200, or toward the evaporator VP.

The first and second heat exchangers 100 and 200 are plate type heat exchangers and the piping on the inlet side of the first and second heat exchangers 100 and 200 further includes a scale preventing means SC, The prevention means SC is preferably a method of suppressing the rust and scale of the pipe by forming an electrostatic field by the ease of installation and maintenance, and the charging effect by the turbulence-jet and the galvanic current securing the reliability.

The plate type heat exchanger is smaller and lighter than the multi-tube type, while its efficiency is 3 to 5 times and the pipe connection end is provided on the side, which is suitable for the first and second heat exchangers 100 and 200.

The cooling and heating water pipes connected to the heat exchangers 100 and 200 and the heat exchangers 100 and 200 are fixed to the inside of the heat exchangers 100 and 200 and the cooling and heating water pipes The heat exchange efficiency is deteriorated and the efficiency of the heat pump as a whole is lowered. Therefore, in order to maintain the efficiency before the scale or the scale is fixed, it is preferable to provide the scale preventing means SC on the inlet side pipe of the heat exchanger 100, 200.

There are various schemes for the scale preventing means SC, and among them, a scale preventing means which operates by a non-dynamic force which suppresses the rust and scale of the pipe by forming an electrostatic field by the charging effect by turbulence-jet and galvanic current is preferable

(Cooling operation mode)

1 is a configuration diagram of a cooling operation mode of a four-seater high efficiency heat pump system according to an embodiment of the present invention.

The cooling operation mode is performed when the outside air temperature is usually about 20 ° C or more, and only cold water of 5 ° C to 9 ° C is produced from the water outlet side of the second heat exchanger 200 for cooling.

Even in the cooling operation mode, the low-temperature refrigerant gas adiabatically compressed by the compressor (CP) changes into a high-pressure gas refrigerant whose temperature rises to 60 ° C or more in accordance with the ambient temperature. As described above, the high-pressure gas refrigerant raised to a high temperature and a high pressure is converted into a refrigerant by the four-way valve (4-Way) and the three-way valve of the refrigerant line switching valve 300 and is heat-exchanged while passing through the evaporator VP, .

The high pressure liquid refrigerant is drawn into the receiver tank RV through the first check valve # 1 of the check valve group 400 and is vaporized into low pressure refrigerant gas from the expansion valve EV, Gas flows from the second check valve # 2 of the check valve group toward the second heat exchanger 200 side. At this time, the vaporized refrigerant gas is cooled to 1 ° C to 5 ° C according to the outside air temperature, exchanges heat with the cooling water obtained from the second heat exchanger 200, and the temperature of the cold water exiting from the second heat exchanger 200 is reduced to 5 ° C Cool to ~ 9 ° C.

The low-pressure refrigerant gas whose temperature has been slightly elevated by the heat exchange in the second heat exchanger 200 is changed to a flow path in the 3-way valve (3-Way) and is introduced into the accumulator (AC) The low-pressure refrigerant gas is separated into gas and liquid, and is then recycled to the compressor CP.

(Cooling / heating operation mode)

FIG. 2 is a block diagram of a cooling / heating operation mode of a four-seggy high-efficiency heat pump system according to an embodiment of the present invention.

The heating / cooling operation mode is usually performed when the outside air temperature is in the range of 20 to 35 degrees Celsius, so that hot water in the range of 50 to 60 degrees Celsius and cold water of 5 to 9 degrees Celsius are simultaneously produced.

The high-temperature, high-pressure gas refrigerant adiabatically compressed in the compressor (CP) rises to 54-64 ° C depending on the ambient temperature. The high-pressure gas refrigerant raised to a high temperature and a high pressure is converted into a flow in the four-way valve (4-Way) and the three-way valve (3-Way) of the flow path switching valve (300) The first heat exchanger (100) produces hot water having an outflow side temperature in the range of 50 to 60 占 폚.

The high temperature and high pressure gas refrigerant that has passed through the first heat exchanger 100 is drawn into the receiver tank RV through the first return line # 1 of the check valve group 400 and is vaporized in the expansion valve EV, ° C., and the low-temperature refrigerant gas is heat-exchanged while passing through the second heat exchanger (200), and the second heat exchanger (200) produces cold water having an outgoing temperature in the range of 5 to 9 ° C.

The low-temperature refrigerant gas that has risen through the second heat exchanger 200 is converted into a refrigerant in a four-way valve (4-Way), and is introduced into the compressor (CP) through the accumulator (AC).

(Heating operation mode)

FIG. 3 is a configuration diagram of a heating operation mode of a four-seasons high-efficiency heat pump system according to an embodiment of the present invention.

The heating operation mode is usually performed when the outdoor temperature is 15 ° C or less, and only hot water within the range of 50 to 60 ° C is produced to perform heating.

The low-temperature refrigerant gas adiabatically compressed by the compressor (CP) changes into a high-pressure gas refrigerant whose temperature rises to 54-64 ° C according to the ambient temperature. For example, the high-pressure gas refrigerant adiabatically compressed in the compressor (CP) rises adiabatically to about 64 캜 when the outside air temperature is 15 캜 or higher, and about 54 캜 even when the outside air temperature is -15 캜 or lower. As described above, the high-pressure gas refrigerant raised to a high temperature and a high pressure by the adiabatic compression is changed in flow path from the four-way valve (4-Way) of the flow path switching valve 300 and exchanges heat while passing through the second heat exchanger 200, Produces hot water in the range of 50 to 60 ° C.

The high-pressure refrigerant gas heat-exchanged in the second heat exchanger 200 is introduced into the receiver tank RV through the fourth check valve # 4 of the check valve group 400 to be vaporized from the expansion valve EV into low- The low pressure refrigerant gas which is vaporized and cooled at this time is introduced into the evaporator VP and the low pressure refrigerant gas whose temperature is increased by heat exchange in the evaporator VP is supplied to the three- Way switching valve 300 to be introduced into the accumulator AC so that the low-pressure refrigerant gas drawn into the accumulator AC is separated into gas and liquid and is then recycled to the compressor CP.

HP: Heat Pump System
CP: Compressor VP: Evaporator
RV: Receiver tank EV: Expansion valve
AC: Accumulator SC: Scale prevention means
100: first heat exchanger
200: second heat exchanger
300: Flow switching valve 4-Way: 4-way valve
3-Way: 3-way valve
400: Check valve group # 1: First check valve
# 2: Second check valve # 3: Third check valve
# 4: Fourth check valve
500: System control sensor group
600: environmental measurement sensor group
700:

Claims (7)

A first heat exchanger for producing hot water by heat-exchanging with a high-temperature high-pressure refrigerant gas compressed at a high temperature and a high pressure in the compressor, a first heat exchanger for condensing the high-temperature and high-pressure refrigerant gas into liquid high- An expansion valve for expanding the liquid high pressure refrigerant stored in the receiver tank, an accumulator for preventing the liquid refrigerant from being introduced into the compressor, And a second heat exchanger for producing cold water by heat exchange with vaporized refrigerant gas expanded in the expansion valve,
A three-way valve connected to the four-way valve for changing the flow path of the high-pressure refrigerant gas or the low-pressure refrigerant gas; a four-way valve for switching the flow path of the high-pressure refrigerant gas and the low- And a flow control valve
Pressure refrigerant of the expansion valve to the receiver tank side, a second backflow allowing only the flow of the liquid high-pressure refrigerant to the receiver tank, a second backflow allowing the low-pressure refrigerant liquid of the expansion valve to flow only to the second heat exchanger, And a fourth check valve that allows the high-pressure refrigerant gas passing through the second heat exchanger to flow only through the expansion valve;
A system control sensor group in which at least one of a pressure gauge, a pressure sensor, a temperature sensor, a high-pressure switch, and a flow switch is provided at the upstream and downstream piping in the vicinity of the compressor and at the inlet / outlet side of the first and second heat exchangers,
A surrounding environment measurement sensor group which is installed in the vicinity of the heating / cooling target area or in a building and is composed of an outside air temperature, a humidity, a radiation amount sensor and a storage tank temperature sensor,
An input unit for receiving data of a measurement signal and an operation mode switching conditional expression of the system control sensor group and the environment measurement sensor group; a central processing unit for calculating input data of the input unit by a given control formula; And an output section for outputting an operation result, wherein the output section output signal includes a control section for switching the operation mode by controlling the flow path switching valve,
The control unit may include an input unit for inputting program and operation control parameters through a keypad or a keyboard and transmitting and receiving analog or digital signals of the sensor group, a storage device for storing input data, a central processing unit for computing data, A PLC (Programmable Logic Controller) composed of an output unit for outputting is used,
The output unit is configured to be capable of communicating with a wired or wireless Internet network so as to remotely input or change control variables, operating conditions,
Wherein the first heat exchanger and the second heat exchanger are plate heat exchangers,
Scale preventing means for suppressing rust and scale of the pipe by forming an electrostatic field by the charging effect by turbulent-jet and galvanic current is installed in the inlet-side pipe of the first heat exchanger and the second heat exchanger,
Wherein the first and fourth check valves are connected to each other in a straight line so that the flow directions thereof are opposite to each other, and the second and third check valves are piped in a straight line so that the flow direction can flow in both directions, Wherein the central portion of the first and fourth check valves is connected to the receiver tank and the central portion of the second and third check valves is connected to the rear end of the expansion valve,
Cooling operation mode, the heating / cooling operation mode, or the heating operation mode according to the outside air temperature or the seasonal change, so as to operate the high-efficiency heat pump system.
delete delete delete The method according to claim 1,
Wherein the cooling operation mode is a mode in which the high-temperature and high-pressure gas refrigerant compressed in the compressor is converted into a four-way valve and a three-way valve of the flow path switching valve and is passed through the evaporator,
The high-pressure liquid refrigerant passes through a first check valve of the check valve group, is drawn into the receiver tank, is vaporized by the expansion valve, and is phase-changed into low-temperature refrigerant gas at 1 to 5 ° C,
Wherein the low-temperature refrigerant gas undergoes heat exchange with the second heat exchanger to produce cold water having a temperature on the outflow side of the second heat exchanger in a range of 5 to 9 DEG C,
And the low-temperature refrigerant gas that has been heated by passing through the second heat exchanger is converted into a flow path through a four-way valve, and is introduced into the compressor through the accumulator.
The method according to claim 1,
Wherein the cooling / heating operation mode is a mode in which the high-temperature high-pressure gas refrigerant compressed in the compressor is converted into a four-way valve and a three-way valve of the flow path switching valve to perform heat exchange in the first heat exchanger, Produces hot water in the temperature range of 50-60 < 0 > C,
The high-temperature high-pressure gas refrigerant passing through the first heat exchanger is introduced into the receiver tank through the first reverse passage of the check valve group, is vaporized in the expansion valve, and is phase-changed into low-temperature refrigerant gas of 1 to 5 ° C,
Wherein the low-temperature refrigerant gas is heat-exchanged while passing through the second heat exchanger to produce cold water having a temperature on the outflow side of the second heat exchanger in a range of 5 to 9 DEG C,
And the low-temperature refrigerant gas that has been heated by passing through the second heat exchanger is converted into a flow path through a four-way valve, and is introduced into the compressor through the accumulator.
The method according to claim 1,
Wherein the high-temperature and high-pressure gas refrigerant compressed in the compressor is flown in the four-way valve of the flow path switching valve, passes through the second heat exchanger, and is heat-exchanged, so that the temperature at the outlet side of the second heat exchanger is 50 to 60 Lt; / RTI >< RTI ID = 0.0 &
The high-pressure refrigerant gas heat-exchanged in the second heat exchanger is introduced into the receiver tank through the fourth check valve of the check valve group, is vaporized into low-pressure refrigerant gas in the expansion valve, and the vaporized low-pressure refrigerant gas is introduced into the evaporator ,
And the low-pressure refrigerant gas heat-exchanged in the evaporator is flowed through the three-way valve and the four-way valve, and is introduced into the compressor through the accumulator.

Images