KR20140097858A - Heat pump - Google Patents

Abstract

The present invention relates to a heat pump with enhanced heating/cooling efficiency. The present invention is configured to bypass a high temperature and high pressure refrigerant compressed in a compressor to a heat exchanger without passing through an indoor condenser to exchange heat with a solution in a heating process using the refrigerant or water when the waste heat temperature inside or outside a building is lower than the temperature of the outside air in summertime or higher than the temperature of the outside air in wintertime. Accordingly, the present invention can enhance cooling efficiency by accelerating the condensation of the high-temperature refrigerant during summertime and increase heating efficiency by increasing the evaporation performance of an outdoor evaporator during winter time. The present invention can also perform a heating operation and a defrosting operation in a heat pump simultaneously by defrosting the outdoor evaporator with the solution heated during the heat exchange process with the refrigerant when the outdoor evaporator is frosted since the outdoor temperature is low during wintertime.

Description

HEAT PUMP {HEAT PUMP}

The present invention relates to a heat pump, and more particularly, to a heat pump, and more particularly, to a heat pump in which when a waste heat temperature of a building or an exterior is lower than an outside temperature in a summer season, Thereby improving the cooling and heating performance of the heat pump. In addition, since the outdoor air temperature is low during the winter season, the outdoor heat exchanger is prevented from being frosted, The refrigerant is bypassed to the heat exchanger directly without passing through the indoor side condenser to accelerate the liquefaction of the refrigerant, and the defrosting of the outdoor side evaporator is performed by the solution heated by heat exchange with the refrigerant in the heat exchanger, The heat pump with improved heating and cooling efficiency One will.

The heat pump is a device for moving the heat on the low temperature side to the high temperature side through a cycle of sequentially compressing, condensing, expanding, and evaporating the refrigerant, and such a heat pump can be used for cooling and heating the room.

That is, the indoor heat is generated or the hot water is produced by using the heat generated when the refrigerant is condensed in the condenser, while the indoor is cooled or the cold water is produced using the principle that the refrigerant is vaporized in the evaporator and the surrounding heat is taken away .

On the other hand, when the heat pump is used for heating, when the outside air temperature is low, the evaporator installed on the outdoor side may generate frost. Such a frost interrupts the heat exchange between the evaporator and the outside air to lower the evaporation efficiency of the refrigerant, The heat efficiency of the heat exchanger is deteriorated. In order to solve this problem, a heater is installed around the evaporator to remove the frost.

However, this has a problem that a separate heater must be installed and energy for operating the heater is consumed.

As an alternative to the installation of the heater, there is a problem that the evaporator is operated so as to perform a condensing action to remove the frost (that is, defrosting), but in this case, heating must be stopped for defrosting have.

On the other hand, the refrigerant discharged from the evaporator moves to the compressor. In some cases, the refrigerant is not vaporized 100% due to evaporation in the evaporator, and some of the refrigerant remains in the liquid state. In this case, There is a problem that the compression efficiency is lowered and the compressor is broken or broken.

Accordingly, the applicant of the present application has solved the above-mentioned problems through Patent Registration No. 10-1124872 (published on Dec. 16, 2010), and the present invention is a further improvement of the present invention patent.

In the present invention, when the waste heat temperature of the building or the outside is lower than the outside temperature in the winter season and the outdoor temperature is higher than the outside temperature in the winter season, the high temperature and high pressure refrigerant compressed by the compressor is heat- The condensing of the high temperature refrigerant is promoted in the summer to improve the cooling efficiency and the evaporation performance of the outdoor side evaporator is improved in the winter season to improve the heating efficiency, When the outdoor air temperature is low and frost is generated in the outdoor evaporator, the outdoor heat exchanger is heat-exchanged with the refrigerant to heat the outdoor evaporator, and the heat pump is heated and defrosted at the same time, The purpose of the pump is to provide.

The heat pump of the present invention for achieving the above object is constituted by a compressor, an indoor condenser, an outdoor evaporator, a liquid separator, and a heat pump having an expansion valve, wherein the outdoor evaporator comprises a first and a second evaporator And a solution reservoir for storing a solution for defrosting the frost of the first and second evaporators in the winter season is connected to the inlet side of the first and second evaporators, And a heat exchange unit for heat-exchanging the solution discharged from the solution storage unit is connected between the heat exchange unit and the solution storage unit. When the waste heat temperature of the building or the outside is lower than the outdoor temperature of the summer or the outdoor temperature of the winter season, A pump for pumping the solution stored in the solution storage unit to circulate the solution to the heat exchange unit, A bypass line for circulating a part of the high-temperature and high-pressure refrigerant compressed by the compressor to the heat-exchanging unit without passing through the indoor-side condenser is connected to the heat exchanging unit from the piping line between the condensing unit and the heat- And an outlet side of the first and second evaporators is connected to a solution circulation line for circulating the heated solution through the heat exchange unit with the refrigerant to the first and second evaporators.

The heat exchanger may further include a refrigerant heat exchanger for exchanging heat between the high-temperature and high-pressure refrigerant compressed by the compressor and the solution discharged from the solution reservoir, and a waste heat exchanger for exchanging heat between the waste heat from the outside and the solution discharged from the solution reservoir And the refrigerant heat exchanger and the waste heat exchanger are connected to the solution circulation line.

The heat exchange between the high temperature and high pressure refrigerant and the solution in the refrigerant heat exchanger is performed when the temperature of the refrigerant circulation line is determined to be overheat because the temperature of the refrigerant circulation line is higher than the set temperature or higher than the set pressure of the pressure switch, The refrigerant is configured to flow into the liquid separator after facilitating liquefaction through heat exchange with the solution.

In the waste heat exchanger, the heat exchange between the waste heat and the solution is performed when the waste heat temperature of the building or the outside is higher than the outside temperature of the winter season or lower than the outside temperature of the summer season, Is heated to a certain temperature to promote evaporation of the refrigerant, then flows into the first and second evaporators through the solution circulation line, and the solution, which is heat-exchanged with external waste heat in the summer season, is cooled to a predetermined temperature, And then flows into the first and second evaporators through a solution circulation line.

The pipeline and the bypass line between the compressor and the indoor side condenser are connected by a three-way valve, and the three-way valve controls the temperature of the refrigerant circulation line (liquid pipe) so as to circulate a part of the refrigerant of high temperature and high pressure to the bypass line And a pressure sensor for measuring the pressure of the refrigerant circulation line.

As described above, according to the present invention, when the waste heat temperature of the building or the outside is lower than the outdoor temperature in the winter season and the outdoor temperature is higher than the outdoor temperature in the winter season in the process of heating with the refrigerant or water, In order to improve the efficiency of cooling by promoting the condensation of high temperature refrigerant during the summer season and to improve the evaporative performance of the outdoor evaporator during the winter season, the heating efficiency is improved by bypassing the indoor heat exchanger for the heat exchange without passing through the indoor side condenser. On the other hand, when the outside air temperature is low in the winter season, when the outdoor evaporator is frosted, the effect of heating and defrosting the heat pump can be achieved while defrosting the outdoor evaporator with the solution heated by heat exchange with the refrigerant in the heat exchanger It can be expected.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of a heating operation mode (defrost operation mode) of a heat pump according to an embodiment of the present invention; Fig.
2 is a block diagram of a cooling operation mode of a heat pump according to an embodiment of the present invention;

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

FIG. 1 is a configuration diagram for a heating operation mode (defrost operation mode) of a heat pump according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a heat pump operation mode of a heat pump according to an embodiment of the present invention.

1 and 2, a heat pump having improved cooling and heating efficiency according to an embodiment of the present invention includes a compressor 1, an indoor-side condenser 1 for condensing the high-temperature, high-pressure refrigerant discharged from the compressor 1, (6, 7) for expanding the refrigerant passed through the liquid separator (5) and the liquid separator (5), and an outdoor side (6, 7) for evaporating the refrigerant passing through the expansion valves And an evaporator.

The refrigerant circulates sequentially through the compressor 1, the indoor condenser 2, the liquid separator 5, the expansion valves 6 and 7, and the outdoor evaporator, and the heat pump from the circulation of the refrigerant is heated The operation mode is the operation mode (defrost operation mode), and the operation mode is the cooling operation mode in the summer.

As is known, although the heat pump is a device that can be used for heating and cooling, the following description will focus on the case of being used for heating for convenience of explanation. The present invention is characterized in that the outdoor side evaporator is provided with first and second evaporators (3,4) connected in parallel to each other, and the first and second evaporators (3,4) are used to simultaneously perform heating and defrosting You can.

That is, by using the high-temperature and high-pressure refrigerant compressed from the compressor 1, not only the condensing performance of the indoor side condenser 2 can be improved, but also the heat exchange with the refrigerant is performed to the first and second evaporators 3, 4 In the winter season, a solution heated to a predetermined temperature is supplied and a solution cooled to a predetermined temperature during the summer season is supplied to improve the cooling and heating efficiency of the heat pump in the summer season and the winter season, And / or the frost generated in the second evaporator (4) is removed by a solution heated to a predetermined temperature through heat exchange, and a heating operation can be performed at the same time.

Although only the first and second evaporators 3 and 4 are shown in the drawing, two or more evaporators may be provided. In the heating operation mode, the indoor condenser 2 performs a condensing operation, 2 evaporators 3 and 4 evaporate while the indoor condenser 2 evaporates and the first and second evaporators 3 and 4 condense in the cooling operation mode.

That is, the first and second evaporators (3,4) provided in the present invention have a coil shape and have an inlet through which the refrigerant flows and an outlet through which the refrigerant is discharged. The first and second evaporators (3,4) The refrigerant is introduced through the inlet and then discharged through the outlet. When the first and second evaporators 3 and 4 are condensing, the refrigerant flows through the outlet and then flows through the inlet Respectively.

In the embodiment of the present invention, as shown in FIGS. 1 and 2, the first evaporator (3, 4) is connected to the inlet side (upper portion in FIGS. 1 and 2) of the first and second evaporators 3) and / or a solution reservoir 10 for storing a certain amount of solution for defrosting the frost of the second evaporator 4 is connected.

The solution storage part 10 is provided with a heat exchanging part for exchanging heat between the high temperature and high pressure refrigerant compressed by the compressor 1 and the solution discharged from the solution storage part 10. The refrigerant heat exchanger 21 and the waste heat exchange (22) is connected through a pipeline.

That is, the refrigerant heat exchanger 21 exchanges heat between the high-temperature high-pressure refrigerant compressed in the compressor 1 and the solution discharged from the solution storage part 10, and the heat exchange between the high- And the condensation efficiency of the refrigerant is deteriorated because the temperature of the circulation line is higher than the set temperature or higher than the set pressure of the pressure sensor and the refrigerant is heat- 5).

The waste heat exchanger 22 exchanges heat between the external waste heat and the solution discharged from the solution storage part 10. The heat exchange between the external waste heat and the solution is performed such that the waste heat temperature of the building or outside is higher than the outside temperature of the winter season And the solution which is heat-exchanged with the waste heat in the winter season is heated to a predetermined temperature to promote the evaporation of the refrigerant, and then flows through the solution circulation line to the first evaporator 3 and / The solution which flows into the second evaporator 4 and is heat-exchanged with the waste heat in the summer is cooled to a predetermined temperature and then the first evaporator 3 and / or the second evaporator 3 is circulated through the solution circulation line L2, Or into the second evaporator (4).

The refrigerant heat exchanger 21 and the waste heat exchanger 22 are connected to the solution circulation line L2 and the solution storage unit 10 is connected to the refrigerant heat exchanger 21 and the waste heat exchanger 22 Is connected to a plurality of pipeline lines to be branched.

Between the refrigerant heat exchanger 21 and the waste heat exchanger 22 and the solution reservoir 10 constituting the heat exchanger, the waste heat temperature of the building or the outside is lower than the outdoor temperature of the summer, or the outdoor temperature of the winter The solution stored in the solution storage part 10 is installed in the transfer pump 30 which is pumped to circulate the solution to the refrigerant heat exchanger 21 and / or the waste heat heat exchanger 22.

At this time, the refrigerant heat exchanger (21) included in the heat exchanging unit from the piping line between the compressor (1) and the indoor side condenser (2) has a high temperature and high pressure And a bypass line (L1) for circulating a part of the refrigerant to the refrigerant heat exchanger (21) included in the heat exchanger without passing through the indoor side condenser (2).

The solution circulation line L2 is connected to the outlet side of the refrigerant heat exchanger 21 and the waste heat exchanger 22 of the heat exchanger and the outlet side of the first and second evaporators 3, (Or cooled) from the refrigerant heat exchanger 21 and / or the waste heat heat exchanger 22 included in the heat exchanger to the first evaporator 3, And / or the second evaporator (4).

The pipe line between the compressor 1 and the indoor side condenser 2 and the bypass line L1 are connected by a three-way valve V2. The three-way valve V2 connects a part of the high- The temperature sensor for measuring the temperature of the refrigerant circulation line (liquid pipe) or the pressure sensor for measuring the pressure of the refrigerant circulation line so as to circulate the refrigerant through the bypass line L1.

Here, piping lines connecting the indoor side condenser 2 and the liquid separator 5 as well as the inlet and outlet piping lines of the first and second evaporators 3 and 4 are not shown in the drawing, And these check valves are opened or closed by a temperature sensor or a pressure sensor in a sequential or selective manner.

The operation of the heat pump with improved cooling and heating efficiency according to the embodiment of the present invention will be described according to the heating operation mode (defrost operation mode) and the cooling operation mode as follows.

Here, the heating operation mode includes a normal heating operation mode and a heating operation mode in which the condensation efficiency is decreased. Hereinafter, the operation will be described in detail.

[Normal heating operation mode]

The normal heating operation mode is a case where the condensing efficiency is within a normal range before the temperature of the refrigerant piping line is overheated (for example, 35 ° C or less). This is because the temperature sensor of the refrigerant piping line and the high- The temperature and the pressure measured by the temperature sensor and the pressure sensor are proportional to each other. Therefore, when the pressure of the pressure sensor is lower than the set pressure and when the temperature sensor of the refrigerant pipeline is below the set temperature, It means a range judged to be good.

That is, the gas refrigerant of high temperature and high pressure is discharged from the compressor 1, passes through the four-way valve V1, passes through the three-way valve V2 and is heat-exchanged with the internal air or water in the indoor side condenser 2, Through the check valve.

Next, the high-pressure liquid-phase refrigerant passing through the check valve flows into the liquid separator 5, and the high-pressure liquid-phase refrigerant flowing into the liquid separator 5 passes through the expansion valves 6 and 7, Temperature and low-pressure gaseous refrigerant in the first and second evaporators 3 and 4 in parallel, which are side evaporators, then passes through the four-way valve V1, and is further heat-exchanged in the liquid separator 5 once.

The refrigerant heat-exchanged in the liquid separator 5 flows into the compressor 1 after the low-temperature and low-pressure gaseous refrigerant is switched.

At this time, when the waste heat temperature of the building or the outside is higher than the winter outside temperature and it is sensed by the temperature sensor or the pressure sensor, the conveying pump 30 performs the pumping operation by the sensed signal, A certain amount of the solution stored in the solution reservoir 10 flows into the waste heat exchanger 22 included in the heat exchanger.

Then, the solution flowing into the waste heat exchanger 22 is heat-exchanged with the waste heat, and is heated and then flows into the interior of the first and second evaporators 3 and 4 through the solution circulation line L2, The evaporation of the refrigerant in the first and second evaporators 3 and 4 is promoted to improve the heating efficiency in the heating operation mode of the heat pump and the solution accelerating the evaporation of the refrigerant is supplied to the first and second evaporators 3 and 4, 4, and then circulated and stored in the solution storage part 10.

[Heating operation mode in which condensing efficiency is lowered]

The heating operation mode in which the condensing efficiency is lowered is a case where the refrigerant piping line temperature is overheated (for example, 35 ° C or more) and the condensing is not performed well. This is because the refrigerant pipeline line temperature sensor Since the temperature and the pressure measured by the temperature sensor and the pressure sensor are proportional to each other when the pressure sensor is installed on the high pressure side, when the pressure is raised by the pressure sensor by more than a set pressure or when the temperature sensor of the refrigerant pipe line is above the set temperature Which means that it is judged that condensation does not work well.

That is, when the high-temperature and high-pressure gas refrigerant is discharged from the compressor 1 and passes through the four-way valve V1, the pressure measured by the pressure sensor is higher than the set temperature of the temperature sensor provided in the refrigerant pipe line When the refrigerant passes through the three-way valve V2 in an elevated state, the three-way valve V2 opens to the bypass line L1.

Then, the gas refrigerant of high temperature and high pressure which is heat-exchanged with the indoor air or water in the indoor side condenser 2 is liquefied and flows into the liquid separator 5 after passing through the check valve, And bypasses the bypass line L1 and flows into the refrigerant heat exchanger 21. The refrigerant introduced into the refrigerant heat exchanger 21 is liquefied after the heat exchange with the solution is promoted, (5).

Then, the liquid-phase high-pressure refrigerant, which is introduced into the liquid separator 5 through the liquid-phase separator 5, is evaporated into the low-temperature and low-pressure gaseous refrigerant in the first and second evaporators 3, 4 after passing through the expansion valves 6, After passing through the four-way valve (V1), heat exchange is once again performed in the liquid separator (5), and the heat-exchanged refrigerant is sucked into the compressor (1) while the gaseous state refrigerant at low temperature and pressure is switched.

That is, when the measured temperature of the temperature sensor installed in the refrigerant pipe line is higher than the set temperature or when the pressure becomes higher than the set value, the pumping operation of the transfer pump 30 is performed to store the solution stored in the solution storage part 10 The refrigerant is circulated to the refrigerant heat exchanger 21,

In the refrigerant heat exchanger 21, the refrigerant is heat-exchanged with the solution, and the cold solution is heated through heat exchange with the refrigerant, and is circulated through the solution circulation line L2 to the first and second evaporators 3 and 4 Exchanged with the outside air while being circulated and then returned to the solution storage part 10 in a cooled state.

The solution stored in the solution storage unit 10 until the measured temperature of the temperature sensor installed in the refrigerant pipe line or the measured pressure value of the pressure sensor becomes lower than the set temperature or pressure is supplied to the pumping operation of the transfer pump 30 And is circulated and moved between heating and cooling.

At this time, when the waste heat temperature of the building or the outside is higher than the winter outside temperature and it is sensed by the temperature sensor or the pressure sensor, the conveying pump 30 performs the pumping operation by the sensed signal, A certain amount of the solution stored in the solution reservoir 10 flows into the waste heat exchanger 22 included in the heat exchanger.

Then, the solution flowing into the waste heat exchanger 22 is heat-exchanged with the waste heat, and is heated and then flows into the interior of the first and second evaporators 3 and 4 through the solution circulation line L2, The evaporation of the refrigerant in the first and second evaporators 3 and 4 is promoted to improve the heating efficiency in the heating operation mode of the heat pump and the solution accelerating the evaporation of the refrigerant is supplied to the first and second evaporators 3 and 4, 4), and then circulated and stored in the solution storage part 10.

[Defrosting mode]

On the other hand, when defrosting occurs in the first evaporator 3 and / or the second evaporator 4 located on the outdoor side in a state where the heat pump is operating in the heating operation mode, Mode is operated when a sensor for sensing frost is operated when the outside temperature is below 5 ° C.

For example, when the sensor for sensing the snow is operated in a state in which the outside air temperature is low, the heat pump operates in the defrosting mode in a certain time after the operation of the sensor is performed, The defrosting operation is started. When the signal indicating that the frost is removed is inputted, the defrosting operation is terminated. At the same time during the operation of the defrosting operation mode, the heating is also operated without stopping.

That is, when the defrosting operation signal is generated by operating the defrosting-related sensor, the gas refrigerant of high temperature and high pressure is discharged from the compressor 1 and passes through the three-way valve V2 after passing through the four-way valve V1. There is a change in refrigerant flow rate when passing through the three-way valve V2, and some refrigerant passes through the three-way valve V2 and is then heat-exchanged with internal air or water in the indoor side condenser 2, 5).

At this time, a part of the refrigerant of high temperature and high pressure from the opening of the three-way valve V2 bypasses the bypass line L1 without passing through the indoor side condenser 2, and is heat-exchanged with the solution in the refrigerant heat exchanger 21, And the refrigerant whose liquefaction is promoted flows into the liquid separator 5.

Here, in the solution for promoting the liquefaction of the refrigerant in the refrigerant pipe bridge 21, the solution stored in the solution storage part 10 flows into the refrigerant heat exchanger 21 from the pumping operation of the transfer pump 30 , The solution accelerating the liquefaction of the refrigerant through heat exchange is heated and then flows into the first evaporator 3 and / or the second evaporator 4 which sends a defrost signal through the solution circulation line L2, The frozen solution generated in the first evaporator 3 and / or the second evaporator 4 can be removed.

In this case, the liquid high-pressure refrigerant flowing into the liquid separator 5 passes through the expansion valve 6 and / or the expansion valve 7 which has not undergone the defrosting operation, and then flows into the first evaporator 3 and / or the second evaporator 4 Temperature low-pressure gaseous refrigerant, passes through the four-way valve V1 and is once again subjected to heat exchange in the liquid separator 5, and the heat-exchanged refrigerant is converted into low-temperature low-pressure gaseous refrigerant, This compensates for the disadvantage of removing the frost by sending refrigerant of high temperature and high pressure to the outdoor unit during the defrosting operation of the conventional heat pump.

That is, in the conventional defrosting operation of the heat pump, the refrigerant of high temperature and high pressure is sent to the outdoor unit to remove the frost. In this case, since the refrigerant is condensed when the frost is removed, hot refrigerant or liquid refrigerant, In the present invention, the first and second evaporators 3 and 4 in parallel are heated by heating the solution other than the refrigerant so as to eliminate the cause of the failure. A defrosting operation or a defrosting operation by defrosting with a refrigerant, thereby protecting the compressor.

[Cooling operation mode]

After the high-temperature and high-pressure gas refrigerant in the compressor 1 passes through the four-way valve V1, the refrigerant is condensed in the first and second condensers (in the heating operation mode) (3,4) , And the converted liquid refrigerant passes through the check valve and flows into the liquid separator (5).

Then, the liquid high-pressure refrigerant flowing into the liquid separator 5 is converted into low-pressure gas refrigerant vaporized by heat exchange with the internal air or water in the indoor side evaporator 2 (the condenser in the heating operation mode) The low-pressure gaseous refrigerant passing through the four-way valve V1 is once again subjected to heat exchange in the liquid separator 5, and then is converted into low-temperature low-pressure gaseous refrigerant and sucked into the compressor 1.

At this time, when the waste heat temperature of the building or the outside is lower than the outside temperature in summer and the sensor senses it, the pump stored in the solution storage part 10 is pumped from the detection signal to the waste heat exchanger 22).

Then, in the waste heat exchanger 22, the solution is cooled by heat exchange with the waste heat, and the cooled solution flows into the first and second condensers 3 and 4 on the outdoor side through the solution circulation line L2, In the first and second condensers 3 and 4, the cooling solution promotes the condensation of the high-temperature refrigerant, thereby improving the cooling efficiency of the heat pump in the cooling operation mode. The solution accelerating the condensation of the refrigerant, And the return cycle is performed to the storage unit 10.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that such changes and modifications are within the scope of the claims.

One ; Compressor 2; Condenser
3,4; First and second evaporators 5; Liquid separator
6.7; An expansion valve 10; The solution reservoir
21; A refrigerant heat exchanger 22; Waste heat exchanger
30; Transfer pump

Claims (5)

A condenser, an indoor condenser, an outdoor evaporator, a liquid separator, and a heat pump,
Wherein the outdoor side evaporator comprises a first and a second evaporator in parallel,
A solution storage unit for storing a solution for defrosting the frost of the first and second evaporators is connected to the inlet side of the first and second evaporators,
The solution storage unit is connected to a high-temperature, high-pressure refrigerant compressed by the compressor and a heat-exchanging unit for exchanging heat with the solution discharged from the solution storage unit,
Wherein the solution stored in the solution storage portion is circulated between the heat exchange portion and the solution storage portion to circulate the solution stored in the solution storage portion to the heat exchange portion when the waste heat temperature of the building or the outside is lower than the outdoor temperature of the winter season or the outdoor temperature of the winter season, A pump,
A bypass line is connected to the heat exchanging unit from the piping line between the compressor and the indoor side condenser to circulate a part of the high-temperature and high-pressure refrigerant compressed by the compressor to the heat-exchanging unit without passing through the indoor side condenser ,
Wherein the outlet of the heat exchanging unit and the first and second evaporators is connected to a solution circulation line for circulating the heated solution through the heat exchange unit with the refrigerant to the first and second evaporators. The heat exchanger according to claim 1,
A refrigerant heat exchanger for exchanging heat between the high-temperature high-pressure refrigerant compressed in the compressor and the solution discharged from the solution reservoir; and a waste heat exchanger for exchanging heat between the waste heat from the outside and the solution discharged from the solution reservoir, Wherein the heat exchanger and the waste heat exchanger are connected to the solution circulation line. The refrigerant heat exchanger according to claim 2, wherein the heat exchange between the high temperature and high pressure refrigerant and the solution in the refrigerant heat exchanger is determined to be overheat because the temperature of the refrigerant circulation line is higher than the set temperature or higher than the set pressure of the pressure switch, Wherein the refrigerant is introduced into the liquid separator after the liquefaction is promoted through heat exchange with the solution. The waste heat exchanger according to claim 2, wherein the heat exchange between the external waste heat and the solution in the waste heat exchanger is performed when the waste heat temperature of the building or the outside is higher than the outside temperature of the winter season or lower than the outside temperature of the summer season, Is heated to a predetermined temperature to promote evaporation of the refrigerant, flows into the first and second evaporators through the solution circulation line, and the solution, which is heat-exchanged with external waste heat in the summer, is cooled to a predetermined temperature, Is introduced into the first and second evaporators through a solution circulation line to promote condensation of the heat pump. The refrigerant circulation system according to claim 1, wherein the piping line and the bypass line between the compressor and the indoor condenser are connected by a three-way valve, and the three-way valve is connected to the refrigerant circulation line Wherein the opening / closing of the heat pump is controlled by a temperature sensor for measuring the temperature of the refrigerant circulation line or a pressure sensor for measuring the pressure of the refrigerant circulation line.

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