KR101449899B1 - Economizer, Heat Pump and Cooling-heating System using thereof - Google Patents

Abstract

The present invention relates to a heat pump economizer in which an economizer cycle is added to a main cycle and a refrigerant is distributed at a ratio of 9:1 in the interest of efficiency and compressor reliability improvement, a heat pump, and an air-conditioning/heating system using the same. The heat pump economizer according to the present invention includes: a second condenser that is connected to a first condenser and performs secondary condensing on a refrigerant which is condensed by the first condenser; a branch pipe that is connected to a secondary condenser and distributes the secondarily condensed refrigerant at a specific ratio; second expansion means that is connected to the branch pipe and expands the refrigerant which is distributed by the branch pipe; and a second evaporator that is connected to the second expansion means and evaporates the refrigerant which is expanded by the second expansion means by using condensation heat generated by the second condenser. The refrigerant that is distributed by the branch pipe is suctioned to a compressor through the second expansion means and the second evaporator. A refrigerant other than the refrigerant that is distributed by the branch pipe is suctioned to the compressor through first expansion means and the second evaporator. According to the present invention, a compressor discharge temperature is maintained below 105°C even when hot water of up to approximately 65°C is used during heating. Accordingly, compressor life deterioration can be prevented and compressor reliability can be improved.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump economizer, a heat pump, and a cooling / heating system using the heat pump. More particularly, the present invention relates to a heat pump that increases the efficiency and reliability of a compressor by distributing an economizer cycle to a main cycle, An economizer, a heat pump, and a cooling and heating system using the same.

Generally, an air conditioner such as a heat pump is a device for cooling or heating an indoor space by performing a process of compressing, condensing, expanding and evaporating a refrigerant. The air conditioner is divided into a conventional air conditioner in which one load side heat exchanger is connected to one external heat source side heat exchanger and a multi air conditioner in which a plurality of load side heat exchangers are connected to the external heat source side heat exchanger. Such an air conditioner includes a compressor, a condenser, an expansion valve, and an evaporator. The refrigerant discharged from the compressor is condensed in the condenser, then expanded in the expansion valve, and the expanded refrigerant is evaporated in the evaporator and sucked back into the compressor. In the compressor, the high-temperature and high-pressure compressed refrigerant is discharged in a gaseous state, and the refrigerant is changed into a middle-temperature and high-pressure liquid state as it passes through the condenser. As the refrigerant passes through the expansion valve, the refrigerant is changed into a low-temperature and low-pressure liquid and gas mixed state, and the refrigerant changes to a low-temperature and low-pressure gas state as it passes through the evaporator.

FIG. 1 is a schematic diagram showing a conventional heat pump cooling cycle, FIG. 2 is a schematic view illustrating a heat pump heating cycle according to the related art, and FIG. 3 is a schematic diagram showing a conventional heat pump cooling and heating system. As shown in Figs. 1, 2 and 3, in the case of a heat pump capable of cooling operation and heating operation, the order of the condenser 12, the expansion means 14 and the evaporator 16 in the compressor 10 The evaporator 16 becomes the load side heat exchanger and the condenser 12 becomes the external heat source side heat exchanger in the cooling operation mode and the condenser 12 is connected to the load side heat exchanger and the evaporator 16 And becomes an external heat source side heat exchanger.

The heat pump according to the prior art is discharged at 70 DEG C in the compressor 10 at the time of cooling, condensed at 35 DEG C by an external heat source in the condenser 12, expanded to 2 DEG C while being expanded by the expansion means 14 , And evaporated at 7 ° C by the heat source on the load side in the evaporator (16).

The heat pump according to the related art is discharged at 80 占 폚 in the compressor 10 at the time of heating and is condensed to 50 占 폚 by the heat source on the load side in the condenser 12 and is heated to 0 占 폚 while being expanded by the expansion means 14 , And evaporated at 5 ° C by an external heat source in the evaporator 16.

In the case of the heat pump according to the related art, when hot water is used up to about 65 ° C during heating, the refrigerant is discharged at 110 ° C or higher in the compressor, so that the service life of the compressor is lowered. Compressors can be used for about 5 years compared to expensive ones. Therefore, when the heat pump is operated, the life of the compressor, which is a key component, is very important for use. Further, since the refrigerant is input to the compressor at 5 to 7 DEG C, there is a problem in that the energy efficiency is low.

Patent No. 10-1324902 Patent No. 10-0568248

Accordingly, the present invention has been made to solve the above-described problems.

It is an object of the present invention to provide a heat pump and a cooling / heating system using the heat pump, in which an economizer cycle is added to a main cycle and refrigerant is distributed at 9: 1 to improve efficiency and reliability of a compressor.

Hereinafter, specific means for achieving the object of the present invention will be described.

SUMMARY OF THE INVENTION A first object of the present invention is to provide a refrigerant compressor which comprises a compressor for compressing a refrigerant, a first condenser for condensing the compressed refrigerant to discharge condensation heat, a first expansion means for expanding the condensed refrigerant, A heat pump economizer installed on and branched from a refrigerant circulation line between the first condenser and the first expansion means of a heat pump including a first evaporator for vaporizing vapor, the first heat exchanger being connected to the first condenser, A second condenser for secondarily condensing the refrigerant condensed by the first condenser; A branch pipe connected to the secondary condenser for distributing the secondary condensed refrigerant at a specific ratio; A second expansion means connected to the branch pipe for expanding the refrigerant distributed by the branch pipe; And a second evaporator connected to the second expansion means for evaporating the refrigerant expanded by the second expansion means by the heat of condensation generated by the second condenser, The refrigerant passes through the second expansion means and the second evaporator and is sucked into the compressor. The refrigerant other than the refrigerant distributed by the branch pipe passes through the first expansion means and the second evaporator And the refrigerant is sucked into the compressor.

The second expansion means may be a capillary or an electronic expansion valve.

And a valve disposed on the refrigerant circulation line by the branch pipe and controlling the inflow of the refrigerant into the branch pipe.

Further, 5 to 20%, preferably 10%, of the refrigerant is introduced into the second expansion means by the branch pipe.

A second object of the present invention is to provide a heat pump having a heating cycle, wherein the refrigerant circulation line includes a main line and an economizer line separated by a branching tube, the main line compresses the refrigerant and discharges the refrigerant at a high temperature and a high pressure A compressor; A first condenser connected to the compressor to condense the compressed refrigerant and to supply generated condensation heat to a heat source on the load side; A second condenser connected to the first condenser for secondarily condensing the refrigerant having passed through the first condenser; A first expansion means connected to the second condenser to expand the refrigerant condensed; And a first evaporator connected to the first expansion means to absorb evaporation heat from an external heat source and to evaporate the expanded refrigerant, wherein the evaporated refrigerant is sucked into the compressor, and the economizer line 2 branch pipe connected to the condenser and distributing the secondary condensed refrigerant at a specific ratio; A second expansion means connected to the branch pipe for expanding the refrigerant distributed by the branch pipe; And a second evaporator connected to the second expansion means for evaporating the refrigerant expanded by the second expansion means by the heat of condensation generated by the second condenser, And the refrigerant passes through the second evaporator and is sucked into the compressor.

Further, 5 to 20%, preferably 10%, of the refrigerant is introduced into the economizer line by the branch pipe.

A third object of the present invention is to provide a cooling / heating system including a heat pump according to an embodiment of the present invention, including a cooling system and a heating system, wherein the first evaporator, which is a component of the heat pump, Wherein the refrigerant discharged from the compressor becomes the heat exchanger, and the first condenser, which is one component of the heat pump, becomes the external heat source side heat exchanger, and the refrigerant discharged from the compressor becomes the first condenser, the second condenser, 1 evaporator, and is sucked into the compressor. In the heating system, the first evaporator becomes the external heat source side heat exchanger, the first condenser becomes the load side heat exchanger, And the main line and the economizer line, wherein the refrigerant is discharged from the compressor, Wherein the first refrigerant is discharged in the first condenser, the second condenser, the expansion means, and the first evaporator in order and sucked into the compressor, wherein the refrigerant is discharged from the extruder, 2 condenser, the branch pipe, the second expansion means, which is one component of the heat pump, and the second evaporator, which is a component of the heat pump, are sucked into the compressor. .

Further, 5 to 20%, preferably 10%, of the refrigerant is introduced into the economizer line by the branch pipe.

As described above, the present invention has the following effects.

First, according to the present invention, even if hot water is used at a temperature of about 65 ° C during heating, the compressor discharge temperature is maintained at less than 105 ° C, thereby preventing a decrease in service life of the compressor and improving the reliability of the compressor.

Secondly, according to the present invention, the refrigerant temperature at the input side of the compressor is conventionally increased from about 5 ° C to about 9 ° C, and the overall refrigerant circulation amount is improved, thereby improving the efficiency and performance of the air conditioning system.

Thirdly, according to the present invention, 10% of the circulation amount of the refrigerant is utilized for the discarded condensation heat, thereby contributing to the additional efficiency improvement.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, And shall not be interpreted.
1 is a schematic diagram showing a conventional heat pump cooling cycle,
2 is a schematic diagram showing a heat pump heating cycle according to the prior art,
3 is a schematic diagram showing a heat pump cooling / heating system according to the related art,
FIG. 4 is a schematic diagram showing a heat pump cooling cycle according to an embodiment of the present invention;
5 is a flow chart illustrating a heat pump cooling cycle according to an embodiment of the present invention,
FIG. 6 is a schematic diagram showing a heat pump heating cycle according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating a heat pump heating cycle according to an embodiment of the present invention;
FIG. 8 is a schematic view of a heat pump cooling / heating system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following detailed description of the operation principle of the preferred embodiment of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

<Heat pump and heat pump Economizer >

In the present invention, the external heat source may be a geothermal heat source, a hydrothermal source, an air heat source, a gas, an electricity, or the like.

The heat pump according to an embodiment of the present invention may include a cooling cycle and a heating cycle. FIG. 4 is a schematic diagram illustrating a heat pump cooling cycle according to an embodiment of the present invention, FIG. 5 is a flowchart illustrating a heat pump cooling cycle according to an embodiment of the present invention, FIG. FIG. 7 is a flowchart illustrating a heat pump heating cycle according to an embodiment of the present invention. Referring to FIG. 4, 5, 6 and 7, a heat pump according to an embodiment of the present invention includes a compressor 10, a first condenser 120 and a second condenser 122 as condensers, The first evaporator 160 and the second evaporator 162 as the evaporator, the four-way valve 18 and the valve means 20 may be constituted by the first expansion means 140 and the second expansion means 142,

The compressor 10 is configured to discharge refrigerant of high temperature and high pressure in a vapor state, and the discharge temperature reaches about 80 캜. The refrigerant discharge side is connected to the four-way valve 18 and supplies the refrigerant to the first condenser 120. The compressor may be composed of a compressor such as a scroll compressor.

The four-way valve 18 is configured to change the direction of the refrigerant flow during cooling and during heating. In cooling, the compressor (10) and the external heat source side heat exchanger are connected to each other so that the external heat source side heat exchanger functions as a condenser. When heating, the compressor (10) and the load side heat exchanger are connected to constitute a condenser.

The condenser includes a first condenser 120 and a second condenser 122 configured to condense the vapor refrigerant at a high temperature and a high pressure into a liquid refrigerant at a medium temperature and a high pressure. Condensation heat is generated in the condensing process of the refrigerant, and is configured to perform heat exchange with an external heat source during cooling and heat exchange with a heat source on the load side in heating. The condenser may be configured in the form of a heat exchanger.

The first condenser 120 is connected to the compressor 10 and the high temperature and high pressure vapor refrigerant at 80 deg. C is converted into a medium and high pressure liquid refrigerant at 50 deg. C through the first condenser 120. [

The second condenser 122 according to an embodiment of the present invention may be connected to the first condenser 120. The refrigerant which has been converted into the liquid refrigerant at medium temperature and high pressure of 50 ° C through the first condenser 120 is further cooled to 20 ° C through the second condenser 122.

The expansion means may be constituted by a first expansion means (140) and a second expansion means (142), which is configured to convert a liquid refrigerant of middle temperature and high pressure into a liquid refrigerant of a mixture of a low temperature low pressure liquid and a gaseous state. The first expansion means (140) may be connected to the second condenser (122). The refrigerant further cooled to 20 캜 through the second condenser 122 is warmed to 2 캜 through the first expansion means 140. The expansion means may be constituted by an electronic expansion valve, a warm-feeling expansion valve, a capillary or the like.

The second expansion means 142 according to the embodiment of the present invention is constructed such that the refrigerant connected to the branch pipe 30 and further reduced in temperature to 20 캜 by the second condenser 122 is cooled to 15 캜, .

With respect to branch pipe 30, according to one embodiment of the present invention, branch pipe 30 is installed in a line after second condenser 122 to provide a line comprising first expansion means 140 and a second expansion And means 142. &lt; RTI ID = 0.0 &gt; The line including the first expansion means 140 may be referred to as the main line, and the line including the second expansion means 142 may be referred to as the economizer line.

According to one embodiment of the present invention, 95% to 80% of the refrigerant circulation amount is distributed to the main line, and 5% to 20% of the refrigerant circulation amount is distributed to the economizer line. It is most preferable that 90% of the refrigerant circulation amount is distributed to the main line and 10% of the refrigerant circulation amount is distributed to the economizer line. If more than 95% of the refrigerant circulation amount is distributed to the main line and less than 5% of the refrigerant circulation amount is distributed to the economizer line, only about 5% of the effect according to the present invention is exerted. Further, when less than 80% of the refrigerant circulation amount is distributed to the main line, and when an amount exceeding 20% of the refrigerant circulation amount is distributed to the economizer line, the evaporation is not completely performed, and the liquid is introduced into the compressor.

The evaporator may include a first evaporator 160 and a second evaporator 162. The first evaporator 160 and the second evaporator 162 may be configured to convert a refrigerant in a low-temperature and low-pressure vapor-liquid mixed state into a low-temperature and low- The first evaporator 160 may be connected to the first expansion means 140 and the second evaporator 162 may be connected to the second expansion means 142. The evaporation heat required in the second evaporator 162 may be used as condensation heat generated in the second condenser 122. The evaporator can be configured in the form of a heat exchanger.

With respect to the first evaporator 160, the refrigerant which has been warmed to 2 캜 by the first expansion means 140 is evaporated to 7 캜 by the first evaporator 160. The vapor refrigerant at 7 ° C by the first evaporator 160 is sucked into the compressor 10. As the 90% of the refrigerant circulation amount is distributed to the first evaporator 160, the pressure is increased and the refrigerant temperature after evaporation is improved as compared with the conventional one.

With respect to the second evaporator 162, the refrigerant which has been warmed to 15 캜 by the second expansion means 142 is evaporated to 20 캜 by the second evaporator 162. The vapor refrigerant at 20 占 폚 by the second evaporator 162 is mixed with the vapor refrigerant at 7 占 폚 by the first evaporator 160 and sucked into the compressor 10 by the vapor refrigerant at 9 占 폚. The suction temperature to the compressor 10 is improved, so that the efficiency and performance of the system are improved. Further, there is an advantage that the discharge temperature of the compressor 10 is lowered. This has the effect of preventing the life of the compressor 10 from deteriorating.

Further, since the second evaporator 162 uses the secondary condensation heat by the second condenser 122 as the evaporation heat of the refrigerant, the efficiency of the system is increased. Further, it is possible to prevent overheating phenomenon of compressor discharge due to an increase in refrigerant circulation amount. This leads directly to the improvement of the efficiency and the reliability of the compressor. Conventionally, when the hot water is used at 60 DEG C or higher, the discharge temperature of the compressor is increased to shorten the service life of the compressor. However, according to the present invention, since the discharge temperature of the compressor can be prevented from being overheated, Can also be used.

The valve means 20 can be constituted by an electronic solenoid valve. It is possible to configure various valves to realize such an effect. The opening and closing of the economizer line is determined by the valve means 20 and the distribution ratio of the refrigerant circulation amount is determined by the valve means 20 or may be configured to be determined by the cross sectional area of the pipe.

With respect to the heat pump economizer, it can be referred to as a heat pump economizer including the second expansion means 142 and the second evaporator 162 and the second condenser 122, the branch pipe 30 and the valve means 20 .

4 and 5, the cooling cycle of the heat pump according to an embodiment of the present invention is similar to the prior art, except that only the second condenser 122 is added . The refrigerant discharged from the compressor 10 flows into the first condenser 120 through the four-way valve 18 and the condensed refrigerant is supplied to the second condenser 122 by the second condenser 122 The refrigerant is secondarily condensed and flows through the first expansion means 140 to the first evaporator 160 and the evaporated low temperature and low pressure vapor refrigerant is again sucked into the compressor 10. The first evaporator 160 is a load side heat exchanger, and the first condenser 120 is an external heat source side heat exchanger.

Regarding the heating cycle, as shown in FIGS. 6 and 7, the heating cycle of the heat pump according to an embodiment of the present invention may include a main line and an economizer line. In the main line according to the embodiment of the present invention, the refrigerant discharged from the compressor 10 flows into the first condenser 120 through the four-way valve 18, and the condensed refrigerant is discharged by the second condenser 122 The refrigerant is secondarily condensed and flows through the first expansion means 140 to the first evaporator 160 and the evaporated low temperature and low pressure vapor refrigerant is again sucked into the compressor 10. The first evaporator 160 is an external heat source side heat exchanger, and the first condenser 120 is a load side heat exchanger.

The economizer line according to an embodiment of the present invention starts from the branch pipe 30 connected to the refrigerant discharge port of the second condenser 122. [ When the valve means 20 is opened, the refrigerant partially distributed in the branch pipe 30 passes through the second expansion means 142 and flows into the second evaporator 162. The vaporized low-temperature and low-pressure vapor refrigerant is introduced into the compressor 10 To the main line again at the refrigerant inlet side.

<Air-conditioning system>

8 is a schematic diagram showing a heat pump cooling / heating system according to an embodiment of the present invention. As shown in FIG. 8, the heat pump cooling / heating system according to the embodiment of the present invention can be configured to allow both the cooling cycle and the heating cycle by the four-way valve 18. In the cooling cycle, the external heat source-side heat exchanger for exchanging heat between the external heat source and the refrigerant becomes the first condenser 120, and the load side heat exchanger for allowing the load side and the refrigerant to heat-exchange becomes the first evaporator 160. In the heating cycle, the external heat source side heat exchanger serves as the first evaporator 160 and the load side heat exchanger serves as the first condenser 120.

The heat pump and the cooling / heating system according to an embodiment of the present invention described above may include a plurality of compressors to improve the capacity. Further, it is apparent that a receiver tank for improving the capacity of the refrigerant, a refrigerant filter, and the like may be additionally included.

As described above, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

10: Compressor
12: Condenser
14: Expansion means
16: Evaporator
18: Four way valve
20: valve means
30: Branch organization
120: first condenser
122: second condenser
140: first expansion means
142: second expansion means
160: First evaporator
162: Second evaporator

Claims (8)

A first expansion device for expanding the condensed refrigerant, and a first evaporator for evaporating the expanded refrigerant by absorbing the evaporation heat, and a second evaporator for condensing the refrigerant, The heat pump economizer according to claim 1, wherein the first condenser and the first expansion means are disposed on a refrigerant circulation line between the first condenser and the first expansion means,
A second condenser connected to the first condenser for secondarily condensing the refrigerant condensed by the first condenser;
A branch pipe connected to the secondary condenser for distributing the secondary condensed refrigerant at a specific ratio;
A second expansion means connected to the branch pipe for expanding the refrigerant distributed by the branch pipe;
A second evaporator connected to the second expansion means for evaporating the refrigerant expanded by the second expansion means by the heat of condensation generated by the second condenser; And
Regulating means provided on the refrigerant circulation line by the branch pipe, for regulating inflow of the refrigerant into the branch pipe;
Lt; / RTI &gt;
The second expansion means is constituted by a capillary tube or an electronic expansion valve,
Wherein the refrigerant distributed by the branch pipe passes through the second expansion means and the second evaporator and is sucked into the compressor,
The refrigerant other than the refrigerant distributed by the branch pipe is sucked into the compressor through the first expansion means and the first evaporator,
5 to 20% of the refrigerant flows into the second expansion means by the branch pipe,
The second condenser and the second evaporator are constituted by one heat exchanger,
The external heat source is used for the heating cycle of the geothermal heat pump,
Wherein the discharge temperature of the compressor is maintained at less than 105 DEG C even when hot water is used at 65 DEG C or higher in the heat pump.
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