WO2017179949A1

WO2017179949A1 - Dual heat pump heating and cooling apparatus

Info

Publication number: WO2017179949A1
Application number: PCT/KR2017/004073
Authority: WO
Inventors: 이도규
Original assignee: 주식회사 신우종합에너지
Priority date: 2016-04-15
Filing date: 2017-04-14
Publication date: 2017-10-19
Also published as: KR101657664B1

Abstract

The present invention provides, in order to improve the stability and durability of products by enabling normal operation even if external air has an extremely low temperature, a dual heat pump heating and cooling apparatus comprising a low-temperature side refrigeration cycle and a high-temperature side refrigeration cycle and including a dual heat exchanger in which a low-temperature side condenser and a high-temperature side evaporator are coupled so as to exchange heat with each other, wherein: a high-temperature side compressor outlet end is provided so as to be alternately connected, by the control of an electronic valve, to either a high-temperature side hot water condenser disposed so as to exchange heat with a hot water line of a hot water tank or a high-temperature side defrosting and cooling condenser disposed so as to exchange heat with a low-temperature side outer evaporator; a low-temperature side outer evaporator outlet end is provided so as to be connected to a low-temperature side auxiliary evaporator inlet end disposed so as to exchange heat with a high-temperature side auxiliary condenser; and a high-temperature side hot water condenser outlet end is controlled by the electronic valve so as to be connected to a high-temperature side evaporator inlet end by selectively passing through the high-temperature side auxiliary condenser according to the temperature of external air of the low-temperature side outer evaporator.

Description

Dual Heat Pump Air Conditioning Unit

The present invention relates to a dual heat pump air-conditioning apparatus, and more particularly, to a dual heat pump air-conditioning apparatus capable of normal operation even when the outside air is cryogenic temperature is improved stability and durability of the product.

In general, a binary refrigeration cycle is a refrigeration system using refrigerants having different boiling points. Here, the refrigerant changes phase from liquid to gas or gas to liquid before and after the boiling point.

At this time, the dual refrigeration cycle is provided with a low temperature side refrigeration cycle using a low temperature side first refrigerant boiling at a low temperature and a high temperature side refrigeration cycle using a high temperature side second refrigerant boiling at a relatively high temperature, the evaporation of the high temperature side refrigerant And condensation of the low temperature side refrigerant occurs in one cascade heat exchanger.

Therefore, even when the outside air temperature is low in winter, the refrigerant discharge gas temperature at the high temperature side can be maintained at a constant high temperature of 85 ° C. or higher, which is effective for producing hot water.

On the other hand, in the conventional heat pump apparatus, the low temperature first refrigerant compressed by the low temperature side compressor supplies heat to the high temperature side refrigerant through the casecade heat exchanger, and then passes through the low temperature side expansion valve and the low temperature side evaporator of the outdoor unit to the low temperature side compressor. Reflowed.

In this case, in the case of the general low temperature side first refrigerant, when the outdoor unit temperature drops below -15 ° C, it is difficult to evaporate smoothly, and a liquid back phenomenon that flows into the compressor with the low temperature side first refrigerant liquefied occurs. .

Accordingly, not only normal driving of the heat pump device is impossible in the cryogenic environment, but also there is a problem that frequent failure occurs in the compressor due to the liquid back phenomenon.

Prior art literature

Patent Literature

(Patent Document 0001) Korean Unexamined Patent Publication No. 10-2003-0071607

In order to solve the above problems, the present invention is to provide a binary heat pump cooling and heating device that is capable of normal operation even when the outdoor air is cryogenic temperature improves the stability and durability of the product.

In order to solve the above problems, the present invention comprises a low temperature side refrigeration cycle and a high temperature side refrigeration cycle, the low temperature side condenser and the high temperature side evaporator comprising a two-way heat exchanger coupled to heat exchange with each other, The discharge side of the compressor is alternately connected to one of the high temperature side hot water condenser arranged to exchange heat with the hot water line of the hot water tank by the solenoid valve control and the high temperature side defrost cooling condenser arranged to exchange heat with the low temperature side external evaporator. The low temperature side external evaporator discharge stage includes an evaporation compensation heat exchanger including the high temperature side subcondenser and the low temperature side evaporator so as to be connected to the low temperature side secondary evaporator inlet end arranged to exchange heat with the high temperature side secondary condenser. The condenser discharge stage is connected to the high temperature according to the outside air temperature of the low temperature side A solenoid valve controlled to be connected to the high temperature side evaporator inlet end via an on-side auxiliary condenser selectively; an evaporation compensation line connected to the high temperature side evaporator inlet end via the high temperature side auxiliary condenser at the high temperature side hot water condenser discharge end; And a high temperature heating line directly connected to the inlet end of the high temperature side evaporator without the high temperature side auxiliary condenser, and if the external temperature of the low temperature side evaporator exceeds a preset first evaporation compensation temperature, The first solenoid valve of the evaporation compensation line and the first solenoid valve are closed and the second solenoid valve of the high temperature heating line is controlled to be opened, and if the low temperature side external evaporator side outside temperature is less than or equal to a predetermined first evaporation compensation temperature; The second solenoid valve of the high temperature heating line is controlled to be opened, and the outside temperature of the low temperature side external evaporator is the first evaporation report. Is less than a second evaporation temperature compensation to a predetermined temperature less than said first electronic valve being gaebangdoe provides two won heat pump air conditioning system, it characterized in that the control such that the second solenoid valve is closed.

Here, the low temperature side condenser discharge end is provided to be alternately connected to one of the low temperature side defrost compensator and the low temperature side external evaporator arranged to exchange heat with the cold water line of the cold water tank by the solenoid valve control. Preferably, the solenoid valve is controlled to be connected to the low temperature side defrost compensator evaporator stage when the high temperature side defrost cooling condenser inlet stage is connected.

The low temperature side external evaporator and the high temperature side defrost cooling condenser are provided in pairs, and the low temperature side condenser discharge stage is branched in pairs so as to be connected to each low temperature side external evaporator. The provided external evaporation line is connected, it is preferable that each of the high temperature side defrost cooling condenser discharge end is provided with a pressure control valve for controlling the condensation pressure of the high temperature side second refrigerant.

Meanwhile, the capacity ratio between the low temperature side compressor of the low temperature side refrigeration cycle and the high temperature side compressor of the high temperature side refrigeration cycle is configured in a ratio of 1: 1, and the outside temperature of the low temperature side external evaporator is used to prevent overcompression of the low temperature side compressor. If the degree is more than a predetermined excessive temperature, it is preferable that the blowing fan rotation speed of the low-temperature external evaporator is controlled to slow down.

Through the above solution, the present invention provides the following effects.

First, the low temperature side evaporator is connected to a low temperature side secondary evaporator arranged to exchange heat with a high temperature side secondary condenser at the low temperature side external evaporator discharge end, so that the residual heat of the high temperature side second refrigerant used for producing hot water can be supplied to the low temperature side first refrigerant. The low temperature side of the first refrigerant can be smoothly evaporated even in a harsh environment, thereby maintaining stable heating performance and minimizing failure due to the liquid back phenomenon, thereby improving stability and durability of the device.

Second, since a pair of external evaporators are connected to the discharge side of the low temperature side condenser, the contact area between the low temperature first refrigerant and the outside air is increased, thereby enabling a smoother evaporation, and also absorbing a large amount of heat from the outside air so as to absorb the high temperature side second refrigerant. The heating efficiency of the device can be improved.

Third, the high temperature side second refrigerant discharged from the high temperature side compressor is circulated to the defrost cooling condenser, and the low temperature side first refrigerant is circulated to the defrost compensation evaporator during the defrosting operation and at the same time the defrosting of the low temperature external evaporator is performed. Since the circulation process is absorbed by the low-temperature compressor and the compression process is maintained, the heat source for evaporation of the high-temperature second refrigerant can be continuously supplied to the dual-side heat exchanger, thereby enabling fast and efficient defrosting operation.

1 is a block diagram of a dual heat pump air conditioning system according to an embodiment of the present invention.

Figure 2 is a flow chart showing the evaporation compensation operation of the dual heat pump heating and cooling apparatus according to an embodiment of the present invention.

Figure 3 is a flow chart showing the defrosting operation of the dual heat pump air-conditioning device according to an embodiment of the present invention.

Explanation of Major Symbols in Drawings

100: binary heat pump air conditioning unit 10: low temperature side compressor

11: low temperature side condenser 14: low temperature side cooling expansion valve

15: Low temperature side defrost compensation evaporator 16: Low temperature side heating expansion valve

17: low temperature side evaporator 18: low temperature side evaporator

20: high temperature side compressor 21: high temperature side hot water condenser

23: high temperature side condenser 26: high temperature side evaporator

28: high temperature side defrost cooling condenser 30: binary heat exchanger

40: evaporation compensation heat exchanger

In the two-way heat pump cooling and heating device comprising a low temperature side refrigeration cycle and a high temperature side refrigeration cycle, wherein the low temperature side condenser and the high temperature side evaporator are coupled to each other to exchange heat, the high temperature side compressor discharge stage uses hot water by solenoid valve control. It is provided to be alternately connected to one of the high temperature side hot water condenser arranged to exchange heat with the hot water line of the tank and the high temperature side defrost cooling condenser arranged to heat exchange with the low temperature side external evaporator, wherein the low temperature side external evaporator discharge end is a high temperature side auxiliary condenser And an evaporation compensating heat exchanger including the high temperature side auxiliary condenser and the low temperature side auxiliary evaporator to be connected to a low temperature side auxiliary evaporator inlet end arranged to exchange heat with the high temperature side hot evaporator. The high temperature side condenser selectively The solenoid valve is controlled so as to be connected to the high temperature side evaporator inlet, the hot water side condenser discharge end is connected to the high temperature side evaporator inlet via the high temperature side condenser, and the high temperature side condenser. A high temperature heating line directly connected to the inlet end of the high temperature side evaporator is provided. When the external temperature of the low temperature side evaporator side exceeds a preset first evaporation compensation temperature, the first solenoid valve of the evaporation compensation line is closed and the The second solenoid valve of the high temperature heating line is controlled to open, and if the low temperature side external evaporator side outside temperature is less than or equal to a predetermined first evaporation compensation temperature, the first solenoid valve of the evaporation compensation line and the second electron of the high temperature heating line. The valve is controlled to open, and the second evaporation compensation temperature is set to be less than the first evaporation compensation temperature of the low temperature side external evaporator side outside temperature. The first solenoid valve is opened, but the second solenoid valve is controlled to be closed.

Hereinafter, with reference to the accompanying drawings will be described in detail a binary heat pump air conditioning apparatus according to a preferred embodiment of the present invention. Here, the dual heat pump air-conditioning unit can be used in a business center that wants centralized heating and cooling such as a bathroom, a steam room, a swimming pool, and a high-rise building.The heating and cooling can be simultaneously performed by supplying hot and cold water, but the maintenance cost can be reduced with high thermal efficiency. It is an air conditioning unit.

1 is a block diagram of a dual heat pump heating and cooling device according to an embodiment of the present invention.

As shown in FIG. 1, the dual heat pump air conditioning apparatus 100 according to an embodiment of the present invention has a low temperature side refrigeration cycle using a low temperature side first refrigerant boiling at a relatively low temperature and a high temperature side boiling at a relatively high temperature. It consists of a high temperature side refrigeration cycle using a second refrigerant.

Here, the low temperature side first refrigerant is preferably understood to mean a refrigerant boiling at a lower temperature than the high temperature side second refrigerant.

For example, as the low temperature side first refrigerant, R-410a which is a mixed refrigerant of HFC series in which R-32 and R-125 are mixed at a composition ratio of 50:50 may be used, and R-410a may be used at 1 atm. It has a boiling point of -51 ° C. The high temperature side second refrigerant may use R-134a of the HFC series, and the R-134a has a boiling point of −26 ° C. at 1 atmosphere.

In addition, the binary heat pump air-conditioning unit is a low temperature side compressor 10, a binary heat exchanger 30, a low temperature side external evaporator 17, a low temperature side defrost compensator 15, an evaporative compensation heat exchanger 40, a high temperature side compressor. 20, a high temperature side hot water condenser 21, and a high temperature side defrost cooling condenser 28.

At this time, the low temperature side compressor 10 serves to circulate the refrigerant by supplying heat by compressing the low temperature side first refrigerant in the low temperature side refrigeration cycle and sending it to the binary heat exchanger 30.

Here, the binary heat exchanger 30 means a device in which the low temperature side condenser 11 and the high temperature side evaporator 26 are coupled to each other to exchange heat.

In detail, the low temperature first refrigerant discharged from the low temperature side compressor 10 flows into the low temperature side condenser 11, and the high temperature side evaporator 26 passes through the high temperature side heating expansion valve 25. 2 Refrigerant flows in.

At this time, the heat of the low temperature side first refrigerant through the condensation of the low temperature side first refrigerant introduced into the low temperature side condenser 11 and the high temperature side second refrigerant introduced into the high temperature side evaporator 26 are increased. It can be delivered to the refrigerant.

The low temperature side first refrigerant condensed in the liquid state in the low temperature side condenser 11 flows to the low temperature side external evaporator 17 or the low temperature side defrost compensator 15.

On the other hand, during the heating operation to make hot water for heating, the low temperature side first refrigerant flows through the low temperature side heating expansion side 16 to the low temperature side external evaporator 17 and absorbs ambient heat and evaporates.

In addition, during the cooling operation for making the cooling water for cooling, or during the defrosting operation to remove frost or frost of the low temperature side external evaporator 17, the condensed low temperature first refrigerant passes through the low temperature side cooling expansion piece 14, It flows to the defrost compensator (15).

At this time, the defrost compensation evaporator 15 is arranged to exchange heat with the cold water line of the cold water tank (c), the first low-temperature side of the coolant is passed through the cooling line as it evaporates to take the heat of the water supplied to the cold water line The water can be cooled to produce cooling water.

As such, when the high temperature side compressor 20 discharge end is connected to the high temperature side hot water condenser 21, and the low temperature side condenser 11 discharge end is connected to the low temperature side defrost compensator 15, cooling is performed. Cold water for heating and hot water for heating can be produced simultaneously.

Accordingly, power consumption can be minimized by simultaneously producing cold water and hot water at the same time when cooling and hot water are required, such as a season change, so that the efficiency of the device can be improved.

On the other hand, in order to prevent overcompression of the low temperature side compressor 10, if the outside temperature of the low temperature side external evaporator 17 side is higher than a preset excessive temperature, the fan speed of the low temperature side external evaporator 17 is controlled to be reduced. Is preferred.

Here, the excess temperature may be set to 7 ~ 40 ℃. In detail, when only hot water is produced without cooling when the external temperature is high, such as a season change, the low temperature side first refrigerant is a low temperature side compressor 10, a low temperature side condenser 11, a heating expansion valve 16, and an external evaporator 17. , Has a circulation path composed of a low temperature side evaporator 18 and a liquid separator 19, absorbs heat from outside air, compresses in an evaporated state, and supplies heat to the high temperature side second refrigerant from the low temperature side condenser 11. .

At this time, the low temperature side first refrigerant may absorb a large amount of heat from the external evaporator 17 due to a high temperature difference from the outside air. When the low temperature side first refrigerant has a high heat amount, the low temperature side first refrigerant A large amount of energy is required to compress the refrigerant, and there is a fear that the low temperature side compressor 10 and the high temperature side compressor 20 are overloaded.

Therefore, when the external temperature is higher than the preset excessive temperature, the blowing fan provided in the low temperature side external evaporator 17 is controlled to reduce the rotational speed per hour, and the low temperature side first refrigerant may absorb appropriate heat.

At this time, the rotational speed of the blowing fan is controlled to decrease as the outside temperature increases, and when the outside temperature is higher than a certain temperature, the blowing fan may be stopped.

Accordingly, while the rotational power of the blower fan decreases toward room temperature, a higher level of heat can be produced than in a low temperature environment, and thus the power efficiency of the device can be improved.

Meanwhile, the high temperature side compressor 20 serves to circulate the high temperature side second refrigerant by compressing and sending the high temperature side second refrigerant to high temperature and high pressure in a high temperature side refrigeration cycle.

In detail, the inlet end of the high temperature side compressor 20 is connected to the outlet end of the high temperature side evaporator 26 of the binary heat exchanger 30. At this time, the high temperature side second refrigerant absorbs heat generated by the condensation of the low temperature side first refrigerant in the high temperature side evaporator 26 and evaporates, and flows through the liquid separator 27 to the high temperature side compressor 20. As it is compressed, it is circulated in a gaseous state of high temperature and high pressure.

Here, the high temperature side compressor 20 discharge end is a high temperature side hot water condenser 21 and a low temperature side external evaporator 17 arranged to exchange heat with the hot water line of the hot water tank h by the

solenoid valve control

20a, 20b. It is provided to be alternately connected to one of the high-temperature side defrost cooling condenser 28 arranged to heat exchange with.

At this time, it means that the connection is alternately connected to one another when disconnected, but it is preferable to understand that it means to keep the connection state with one of the two.

In detail, during the heating operation for making hot water for heating, the discharge end of the high temperature side compressor 20 is connected to the inlet end of the high temperature side hot water condenser 21. At this time, as the second refrigerant of the high temperature and high pressure is condensed in the high temperature side hot water condenser 21 and supplies heat to the water supplied to the hot water line, the water passing through the hot water line may be heated to produce hot water.

In the defrosting operation, the high temperature side compressor 20 discharge end is connected to the high temperature side defrost cooling condenser 28 inlet end. At this time, the high-temperature high-pressure second refrigerant is condensed in the high-temperature defrost cooling condenser 28 and supply heat to the low-temperature external evaporator 17, such as frost or frost generated in the low-temperature external evaporator 17, etc. This can be removed.

On the other hand, the evaporation compensation heat exchanger 40 means a device coupled to the heat exchange between the low temperature side evaporator 18 and the high temperature side auxiliary condenser 23.

At this time, the low temperature side first refrigerant discharged from the low temperature side external evaporator 17 discharge stage or the low temperature side defrost compensation evaporator 15 discharge stage passes through the evaporation compensation heat exchanger 40 to the low temperature side compressor 10. Flows into.

That is, the low temperature side external evaporator 17 discharge end and the low temperature side defrost compensator 15 discharge end are connected to the inlet end of the low temperature side evaporator 18 arranged to exchange heat with the high temperature side auxiliary condenser 23. do.

At this time, the high temperature side hot water condenser 21 discharge end and the high temperature side defrost cooling condenser 28 discharge end selectively pass through the high temperature side auxiliary condenser 23 according to the outside air temperature of the low temperature side external evaporator 17 side. Thus, the solenoid valve controls 22a and 22b are connected to the inlet end of the high temperature side evaporator 26.

That is, when the outside air temperature is low during the heating operation, some or all of the high temperature side second refrigerant that is condensed in the high temperature side hot water condenser 21 and supplied to the hot water line and discharged at a temperature of about 30 to 50 ° C. Via the high temperature side auxiliary condenser 23, it may be circulated to the receiver 24, the high temperature side heating expansion 25 and the high temperature side evaporator 26.

Here, the low outside air temperature is preferably understood to mean that the outdoor temperature at which the low temperature side external evaporator 17 is disposed is low enough that the low temperature side first refrigerant cannot be evaporated smoothly. It can be different depending on, but generally means a temperature lower than -7 ℃.

Accordingly, some or all of the high temperature side second refrigerant of about 30 to 50 ° C., which is condensed and discharged after producing hot water in the high temperature side hot water condenser 21, passes through the high temperature side auxiliary condenser 23, One latent heat for evaporation of the refrigerant can be supplied.

Of course, when the outdoor temperature is in the range of -7 ° C or more, in which the low temperature side first refrigerant is in a range where a smooth evaporation is possible, the high temperature side second refrigerant does not pass through the high temperature side auxiliary condenser 23 and receives the receiver 24. ) And the high temperature side heating expansion piece 25 may be circulated to the high temperature side evaporator 26.

In detail, during the heating operation of the dual heat pump air conditioning apparatus, the low temperature side first refrigerant absorbs heat of outdoor air in which the low temperature side external evaporator 17 is disposed and is first evaporated to the low temperature side secondary evaporator 18. Flows.

At this time, when the outdoor temperature becomes low enough that the low temperature side first refrigerant cannot be evaporated smoothly, the high temperature side second refrigerant of 30 ° C. to 50 ° C., which is primarily condensed, produces hot water. Flow to the side auxiliary condenser (23).

Then, the high temperature side secondary refrigerant is secondary condensed in the high temperature side secondary condenser 23, and residual heat of 30 to 50 ° C. remaining in the high temperature side secondary refrigerant after hot water is produced may be generated in the low temperature side secondary evaporator 18. The low temperature side second refrigerant may be supplied, and the low temperature side first refrigerant may be supplied with sufficient heat to be secondarily evaporated.

At this time, the low temperature side first refrigerant completely evaporated through the second evaporation process flows to the low temperature side compressor 10 via the liquid separator 19. Accordingly, even when the outdoor temperature is excessively reduced, the failure of the device due to incomplete evaporation of the low temperature side first refrigerant can be significantly reduced.

That is, low temperature that may occur due to insufficient amount of refrigerant that may occur as the amount of filtering in the liquid separator 19 increases due to incomplete evaporation of the low temperature first refrigerant, or a liquid back phenomenon in which the low temperature first refrigerant flows into a liquid state. The failure of the side compressor 10 can be significantly reduced.

Table 1 shows the result of measuring the heating efficiency (COP) according to the outside air temperature by comparing the present invention applied to the evaporation compensation heat exchanger and the conventional invention applied only to the binary heat exchanger.

Here, the low temperature side first refrigerant is R-410a, and the high temperature side second refrigerant is R-134a, which is applied to the present invention and the conventional invention in the same manner, and the high temperature side compressor and the low temperature side compressor having the same capacity are used in each invention. Each heating efficiency (COP) was measured with the side compressor and the low temperature side compressor configured to have the same capacity ratio of 1: 1.

As shown in Table 1, the present invention to which the evaporative compensation heat exchanger is applied shows a high heating efficiency as compared with the conventional binary heat exchanger only, and the present invention is 0.1 to 0.2 when the ambient temperature is -7 ° C. or more. It shows a somewhat higher heating efficiency (COP).

In particular, when the outside air temperature is reduced to -15 ℃ or less, both the present invention and the conventional invention appears to decrease the heating efficiency (COP), in the case of the present invention at a normal temperature state (at a heating efficiency of 2 or more to -38 ℃) 7 ℃) was maintained at 60% performance and appeared to operate normally.

On the other hand, in the case of the conventional invention, the decrease in the heating efficiency according to the decrease in the external temperature is shown to be larger than the present invention. When the external temperature is reduced to -20 ° C, the heating efficiency is drastically reduced to less than 2 during operation. It was found that, under -25 ℃ driving is impossible.

As such, the evaporation compensating heat exchanger 40 is provided at the discharge end of the low temperature side external evaporator 17 so that the heat exchange between the high temperature side auxiliary condenser 23 and the low temperature side evaporator 18 is possible when the outside temperature is reduced. Heating efficiency and stability can be improved.

That is, after the hot water is produced, the residual heat of 30 to 50 ° C. remaining in the second refrigerant on the high temperature side is supplied to the first refrigerant on the low temperature side through the evaporative compensation heat exchanger 40, so that the low-temperature first refrigerant is completely completed even in a cryogenic environment. It can be evaporated to maintain a stable heating performance, and the occurrence of failure due to the liquid back phenomenon can be minimized to significantly improve the heating stability and durability of the device.

Meanwhile, an evaporation compensation line (o, k, t, m, w) connected to the inlet end of the high temperature side evaporator 26 via the high temperature side auxiliary condenser 23 at the discharge end of the hot side hot water condenser 21. And, it is preferable that a high temperature heating line (o, p, m, w) directly connected to the inlet end of the high temperature side evaporator 26 without passing through the high temperature side auxiliary condenser (23).

At this time, if the outside temperature of the low temperature side external evaporator 17 is less than or equal to the first predetermined evaporation compensation temperature, the first solenoid valve 22b of the evaporation compensation line o, k, t, m, w and the high temperature heating The second solenoid valve 22a of the lines o, p, m, and w may be controlled to open.

Here, the first evaporation compensation temperature may be set corresponding to the boiling point of the low temperature side first refrigerant, and set to −7 ° C. when the low temperature side first refrigerant has a boiling point similar to that of R-410a. desirable.

At this time, when both of the first solenoid valve 22b and the second solenoid valve 22a are opened, a part of the high temperature side second refrigerant discharged from the high temperature side hot water condenser 21 is the high temperature side auxiliary condenser 23. ) May be circulated to the hot side evaporator 26 and the remaining part may be circulated to the hot side evaporator 26 without passing through the hot side auxiliary condenser 23.

Further, when the low temperature side external evaporator 17 side outside air temperature is less than or equal to the second evaporation compensation temperature set to be less than the first evaporation compensation temperature, the first solenoid valve 22b is opened and the second solenoid valve 22a is opened. Can be controlled to close.

Here, the second evaporation compensation temperature is set to a temperature lower than the first evaporation compensation temperature, and is preferably set to -15 ° C when the low temperature side first refrigerant has a boiling point similar to that of R-410a.

At this time, when the first solenoid valve 22b is opened and the second solenoid valve 22a is closed, all of the high temperature side second refrigerant discharged from the high temperature side hot water condenser 21 is the high temperature side auxiliary condenser ( It may be circulated to the hot side evaporator 26 via 23).

In detail, the high temperature side hot water condenser 21 discharge end and the high temperature side defrost cooling condenser 28 discharge end are connected to a first confluence part o, and the evaporation compensation line o, k, t, m, w ) And the high temperature heating line (o, p, m, w) is branched from the first confluence (o) is connected to the inlet end of the high temperature side evaporator (26).

Here, the evaporation compensation line is provided with a first confluence part (o), the first solenoid valve (22b), but the evaporation inlet portion connecting the first confluence part (o) and the inlet end of the high temperature side auxiliary condenser (23) ( k), the evaporation discharge part (t) connected to the discharge end of the high temperature side auxiliary condenser (23).

The high temperature heating line includes a shielding portion p provided with a first confluence portion o and a second solenoid valve 22a. At this time, the end of the evaporation discharge portion (t) and the end of the shielding portion (p) are merged into one (m), and connected to the inlet end of the high temperature side evaporator (26) (w).

That is, the evaporation compensation line and the high temperature heating line are joined to the first confluence part o, the evaporation discharge part t and the shielding part p, and are connected to the high temperature side evaporator 26 inlet end (m). , w)

Accordingly, the circulation path of the high temperature side second refrigerant during the solenoid valve control can be accurately classified. That is, the circulation path through which the high temperature side second refrigerant flows to the evaporator 26 without passing through the sub condenser 23 or the sub condenser 23 corresponding to the outdoor temperature where the low temperature side external evaporator 17 is disposed is It can be driven accurately.

On the other hand, Figure 2 is a flow chart showing the evaporation compensation operation of the dual heat pump cooling and heating apparatus according to an embodiment of the present invention.

As shown in Figure 2, when the heating operation is started (s10), whether the outside air temperature, that is, the outdoor temperature where the low-temperature external evaporator 17 is disposed, that is whether the external temperature is less than the first preset evaporation compensation temperature (s20) Check it.

At this time, when the external temperature exceeds the first evaporation compensation temperature, the first solenoid valve 22b of the evaporation compensation line is closed, and the second solenoid valve 22a of the high temperature heating line is opened (s21). That is, the high temperature side second refrigerant is circulated without passing through the evaporation compensation heat exchanger 40.

In detail, the low temperature side refrigeration cycle during the heating operation is the low temperature side compressor (10), low temperature side condenser when the outside temperature exceeds -7 ℃

(11), a receiver 12, a low temperature side heating expansion side 16, a low temperature side external evaporator 17, a low temperature side evaporator 18, and a liquid separator 19.

The high temperature side refrigeration cycle includes a high temperature side evaporator 26, a liquid separator 27, a high temperature side compressor 20, a high temperature side hot water condenser 21, a receiver 24, and a high temperature side heating expansion valve 25. It has a circulation structure.

At this time, heat exchange between the high temperature side second refrigerant and the low temperature side first refrigerant is performed between the binary heat exchanger 30, that is, the low temperature side condenser 11 and the high temperature side evaporator 26, and the condensation step of the low temperature side first refrigerant. Exothermic heat generated at may be used as a heat source for evaporation of the high temperature side second refrigerant.

Accordingly, the heat generated during the condensation of the low temperature side first refrigerant in the low temperature side condenser 11 is smoothly transferred to the high temperature side second refrigerant, and the heat loss of the high temperature side second refrigerant is reduced, 2 The refrigerant can be heated quickly.

Here, the low temperature side first refrigerant is compressed in the low temperature side compressor 10, condensed in the low temperature side condenser 11 of the binary heat exchanger 30, and supplies heat to the high temperature side second refrigerant. Then, the condensed low temperature side first refrigerant flows through the receiver 12 to the low temperature side heating expansion side 16, expands, and is evaporated in the low temperature side external evaporator 17 to absorb heat from the outside air.

In this case, the low temperature side external evaporator 17 is preferably provided in pairs, and the low temperature side condenser 11 is branched in pairs so as to be connected to each of the low temperature side external evaporators 17a and 17b. The external evaporation line s equipped with the low temperature side heating expansion sides 16a and 16b may be connected.

That is, the low temperature side first refrigerant discharged from the low temperature side condenser 11 flows to the external evaporation line s through the receiver 12 and is divided along the branched portion of the external evaporation line s. It expands through the heating expansion sides 16a and 16b.

In addition, the low temperature side first refrigerant that is partially expanded at each of the heating expansion sides 16a and 16b may be flowed to each of the external evaporators 17a and 17b to be evaporated.

As such, the low-temperature first refrigerant discharged from the low-temperature side condenser 11 is divided and expanded through each of the heating expansion sides 16a and 16b and flows along a pair of low-temperature external evaporators 17a and 17b, thereby contacting the outside air. By increasing the area, the evaporation can be more smoothly, and a large amount of heat can be absorbed from the outside air and supplied to the high temperature side second refrigerant, thereby improving the heating efficiency of the device.

Of course, when producing the cooling water by the endotherm when the low temperature side first refrigerant evaporates, the low temperature side first refrigerant flows to the low temperature side cooling expansion side 14, expands, and is then evaporated in the low temperature side defrost compensator. Can be.

To this end, a third solenoid valve 13a is provided at the discharge end of the low temperature side condenser 11 along an external evaporation line s connected to the low temperature side external evaporator 17 and at a low temperature in the external evaporation line s. A fourth solenoid valve 13b is provided along the defrost compensation line branched to the side defrost compensator 15.

That is, when the third solenoid valve 13a is opened and the fourth solenoid valve 13b is closed, the low temperature side first refrigerant of the low temperature side condenser 11 passes through the low temperature side external evaporator 17 and the low temperature side auxiliary evaporator ( 18), when the third solenoid valve 13a is closed and the fourth solenoid valve 13b is opened, the low temperature first refrigerant of the low temperature side condenser 11 passes through the low temperature side defrost compensator 15 Flow to the side auxiliary evaporator (18).

At this time, the evaporated low temperature side first refrigerant passes through the low temperature side secondary evaporator 18 of the evaporation compensating heat exchanger 40, but is closed without closing the first solenoid valve 22b without the heat exchange with the high temperature side second refrigerant. 19) flows into the low temperature side compressor (10).

At the same time, the high temperature side second refrigerant absorbs the heat of the low temperature side first refrigerant from the high temperature side evaporator 26 of the binary heat exchanger 30 and evaporates, and flows through the liquid separator 27 to the high temperature side compressor 20. do. At this time, the high temperature side second refrigerant becomes gas of high temperature and high pressure by heat absorbed by the binary heat exchanger 30 and compression through the compressor 20.

Here, the sixth solenoid valve 20b is provided at the discharge end of the high temperature side compressor 20 along the defrost line connected to the high temperature side defrost cooling condenser 28 and is heated to the hot water condenser 21. A fifth solenoid valve 20a is provided along the line.

At this time, during the heating operation, the fifth solenoid valve 20a is opened and the sixth solenoid valve 20b is closed, and the high temperature side second refrigerant flows to the high temperature side hot water condenser 21 to condense and is supplied to the hot water line. Heat with water.

On the other hand, during the heating operation, if the external temperature is less than the first preset evaporation compensation temperature (s20), it is checked whether the defrosting operation (s30).

At this time, when the external temperature during the heating operation is less than the predetermined defrost temperature (see s110 of FIG. 3), when the defrost waiting time has elapsed after the start of heating (s120 of FIG. 3), defrosting operation may be performed, the defrost waiting time Is preferably set according to the external humidity.

Here, the defrost waiting time is preferably understood to mean a time required for defrosting operation to remove frost or frost from the external evaporator after the start of heating, defrosting operation is started when the defrost waiting time after the start of heating, defrosting If the waiting time has not elapsed, the heating operation is maintained.

That is, the defrost waiting time is set to decrease as the external humidity increases, and as the defrost waiting time decreases, the time interval between the start of heating and the defrosting operation is shortened. As the external humidity decreases, the defrost waiting time is set to increase, and as the defrost waiting time increases, the time interval between the heating start and the defrosting operation becomes longer.

At this time, during the defrosting operation for removing frost or defrost of the low temperature side external evaporator 17, the first solenoid valve 22b is closed, the second solenoid valve 22a is opened (s31), and the high temperature side second refrigerant By preventing the high temperature side second refrigerant flow toward the evaporative compensation heat exchanger 40 in which heat flows to the low temperature side first refrigerant, the defrosting operation may be performed by preserving the heat of the high temperature side second refrigerant as much as possible.

At this time, if the defrosting operation state, it is checked whether the external temperature is less than the second evaporation compensation temperature (s40).

When the external temperature exceeds the second evaporation compensation temperature, both the first solenoid valve 22b of the evaporation compensation line and the second solenoid valve 22a of the high temperature heating line are opened (s41), and the external temperature is second evaporation. When the temperature is lower than the compensation temperature, the first solenoid valve 22b of the evaporation compensation line is opened, but the second solenoid valve 22a of the high temperature heating line is closed (s42).

That is, in the case of heating operation other than the defrosting operation state, when the external temperature is below -7 ° C but exceeds -15 ° C, some of the high temperature side second refrigerant flows along the evaporation compensation line and the other part of the high temperature heating line. Can be flowed accordingly.

Accordingly, the residual heat of some of the high-temperature second refrigerant may be preserved, but the remaining heat of the other part may be transferred from the evaporative compensation heat exchanger 40 to the low-temperature first refrigerant, so that the heating efficiency of the apparatus is optimized and the low temperature is low. Complete evaporation of the side first refrigerant may be performed smoothly.

In addition, when the external temperature is -15 ° C. or less during the heating operation other than the defrosting operation state, all of the high temperature side second refrigerant flows along the evaporation compensation line, and the binary heat exchanger 30 passes through the evaporation compensation heat exchanger 40. Circulated to

In detail, the low temperature side refrigeration cycle during the heating operation when the external temperature is less than the second preset evaporation compensation temperature is the low temperature side compressor (10), the low temperature side condenser (11), the receiver (12), the low temperature side heating expansion valve (16). The low temperature side evaporator 17, the low temperature side evaporator 18, and the liquid separator 19 have a circulation structure.

The high temperature side refrigeration cycle includes a high temperature side evaporator 26, a liquid separator 27, a high temperature side compressor 20, a high temperature side hot water condenser 21, a high temperature side auxiliary condenser 23, a receiver 24, It has a circulation structure comprised of the high temperature side heating expansion edge 25.

At this time, the heat exchange between the high temperature side second refrigerant and the low temperature side first refrigerant is carried out between the binary heat exchanger 30, that is, between the low temperature side condenser 11 and the high temperature side evaporator 26, and the evaporation compensation heat exchanger 40, that is, the low temperature side. Between the subevaporator 18 and the hot side subcondenser 23.

Here, the high temperature side second refrigerant is discharged from the high temperature side hot water condenser 21 and flows to the high temperature side auxiliary condenser 23.

At this time, the high temperature side second refrigerant is first condensed in the high temperature side hot water condenser 21, the hot water is heated and has a residual heat of 30 ~ 50 ℃, secondary condensation in the secondary condenser 23 and the low temperature side agent One refrigerant can supply heat.

That is, the low temperature side first refrigerant evaporated to the low temperature side external evaporator 17 may flow to the low temperature side secondary evaporator 18 and may be secondly evaporated by the heat of the high temperature side second refrigerant.

Accordingly, stable heating performance may be maintained even in a cryogenic environment, and failure occurrence of the low-temperature compressor 10 due to liquid back may be reduced, thereby improving heating stability and durability of the apparatus.

As such, the heat exchange between the high temperature side second refrigerant and the low temperature side first refrigerant may be performed at both sides of the binary heat exchanger 30 and the evaporative compensation heat exchanger 40 at a temperature lower than the first evaporation compensation temperature preset during the heating operation.

On the other hand, Figure 3 is a flow chart showing the defrosting operation of the dual heat pump air-conditioning apparatus according to an embodiment of the present invention.

As shown in Figures 1 to 3, the low temperature side condenser 11 discharge end is a low temperature side defrost compensator 15 arranged to exchange heat with the cold water line of the cold water tank (c) by the solenoid valve control (13a, 13b) And it is preferably provided to be alternately connected to one of the low-temperature external evaporator (17).

At this time, the low temperature side condenser 11 discharge end is connected to the low temperature side defrost compensation evaporator 15 inlet end when the high temperature side compressor 20 discharge end and the high temperature side defrost cooling condenser 28 inlet end are connected. Valve controlled 13a, 13b is preferred.

That is, when the sixth solenoid valve 20b provided between the discharge end of the high temperature side compressor 20 and the inlet end of the high temperature side defrost cooling condenser 28 is opened, the discharge end and the low temperature of the low temperature side condenser 11 are opened. The fourth solenoid valve 13b provided between the side defrost compensators 15 may be interlocked so as to be opened.

At this time, when the sixth solenoid valve 20b is opened, the fifth solenoid valve 20a is closed, and when the fourth solenoid valve 13b is opened, the third solenoid valve 13a is closed. Accordingly, the line through which the high temperature side second refrigerant and the low temperature side first refrigerant flow is defined in one direction so that each refrigerant can be circulated smoothly.

Here, in the defrosting operation, the low temperature side refrigeration cycle includes a low temperature side compressor (10), a low temperature side condenser (11), a receiver (12), a low temperature side cooling expansion valve (14), a low temperature side defrost compensator (15), and a low temperature side assistance. It has a circulation structure composed of an evaporator 18 and a liquid separator 19.

The high temperature side refrigeration cycle includes a high temperature side evaporator 26, a liquid separator 27, a high temperature side compressor 20, a high temperature side defrost cooling condenser 28, a receiver 24, and a high temperature side heating expansion valve 25. It has a configured circulation structure.

At this time, heat exchange between the high temperature side second refrigerant and the low temperature side first refrigerant is performed between the binary heat exchanger 30, that is, the high temperature side evaporator 26 and the low temperature side condenser 11.

Here, if frost or frost occurs in the low temperature side evaporator 17 during the winter heating operation, the blowing fan of the low temperature side evaporator 17 does not rotate and prevents endothermic evaporation of the low temperature side first refrigerant to reduce heating efficiency. do.

In detail, when the external temperature is less than the predetermined defrost temperature (s110), the elapsed time after the start of heating is compared with the preset defrost waiting time (s120). The defrosting operation may be started when the external temperature is equal to or less than the predetermined defrost temperature and the elapsed time after the start of heating is equal to or greater than the preset defrost waiting time.

Here, the defrost temperature and the defrost waiting time can be set by calculating the time point when the frost or frost occurs in the cold winter season through a test operation, the defrost waiting time is preferably calculated according to the algorithm applied defrost temperature and external humidity. .

For example, a high humidity and a lot of dropping between 0 ℃ ~ 7 ℃ can reduce the evaporation efficiency of the low-temperature external evaporator 17, at -1 ℃ or less, the humidity is less than 40%, low dropping occurs after heating 90 Defrosting has been shown to be necessary after more than minutes of operation.

That is, when the external temperature is 7 ℃ or less, the external humidity is detected, but the external humidity is defrosted at 90% at 35% or more, 70 minutes at 45% or more, 50 minutes at 55% or more, 45 minutes or more at 65% or more. The waiting time can be set.

At this time, when the external temperature is less than the predetermined defrost temperature, the defrosting operation may be started when the defrost waiting time is set according to the external humidity after the start of heating.

Here, the sixth solenoid valve 20b is opened and the fifth solenoid valve 20a is closed so that the discharge end of the high temperature side compressor 10 is connected to the inlet end of the high temperature side defrost cooling condenser 28, but the low temperature side condenser 11 is closed. The fourth solenoid valve 20b is opened and the third solenoid valve 20a is closed (s130) so that the discharge end is connected to the inlet end of the low temperature side defrost compensator.

At this time, the driving of the low temperature side compressor 10 is stopped (s140). In addition, the low temperature side compressor 10 is restarted when a predetermined waiting time elapses after the start of the defrosting operation (s150) (s160).

That is, when the low temperature side first refrigerant continues to circulate at the start of the defrosting operation, the endothermic is continuously absorbed by the low temperature side evaporator 17, so the low temperature side compressor 10 is re-driven after the waiting time of about 20 seconds for efficient defrosting operation. This is preferred.

At this time, the low temperature side first refrigerant is a low temperature side compressor (10), a low temperature side condenser (11), a cooling expansion valve (14), a defrost compensation evaporator (15), a low temperature side evaporator (18), a liquid separator (19). It has a configured circulation path, and absorbs the heat of the cold water line is compressed in the evaporated state to supply heat from the low temperature side condenser 11 to the high temperature second refrigerant.

The high temperature side second refrigerant includes a high temperature side evaporator 26, a liquid separator 27, a high temperature side compressor 20, a defrost cooling condenser 28, a receiver 24, and a heating expansion valve 25. It has a path, and absorbs the heat of the low-temperature first refrigerant and is condensed in the defrost cooling condenser 28 in the compressed state to remove the frost or frost of the low-temperature external evaporator 17.

At this time, the high temperature side defrost cooling condenser 28 is preferably provided in pairs to correspond to the low temperature side external evaporator 17, it can be made more efficient defrosting operation.

As such, even during the defrosting operation, the high temperature side second refrigerant may be continuously supplied with heat from the low temperature side first refrigerant and thus heated to a high temperature, thereby enabling rapid defrosting operation.

Meanwhile, when a predetermined defrosting operation time has elapsed after the start of the defrosting operation (s170), the fifth solenoid valve 20a is opened and the sixth solenoid valve is opened so that the discharge end of the high temperature side compressor 20 is connected to the inlet end of the high temperature side hot water condenser 21. The solenoid valve 20b is closed, but the third solenoid valve 13a is opened and the fourth solenoid valve 13b is closed so that the low temperature side condenser 11 discharge end is connected to the low temperature side external evaporator 17 inlet end (s180). ).

At this time, the defrosting operation time may be set in response to the external temperature, it is preferably set to about 180 seconds between -7 ~ 7 ℃, 300 seconds between -7 ~-10 ℃, -10 ~ -40 It is preferable that the temperature is set between 400 and 700 seconds. Here, when the outside temperature is -10 ~ -40 ℃, the humidity is very small, one defrosting operation is required every 6 to 9 hours.

When the defrosting operation time elapses, the defrosting operation is terminated and the heating operation for generating hot water may be restarted.

As such, the high temperature side second refrigerant heated along the high temperature side refrigeration cycle is circulated to the high temperature side defrost cooling condenser 28 which is heat-exchanged with the low temperature side external evaporator 17 to remove the drop of frost, frost and the like. Since the first refrigerant is circulated to the defrost compensation evaporator and absorbs heat from the cold water line and is compressed through the low temperature compressor, a heat source for evaporation of the high temperature second refrigerant may be continuously supplied to the binary heat exchanger.

Accordingly, a faster and more efficient defrosting operation can be achieved.

On the other hand, during the cooling operation in which only cold water is produced without producing hot water in the summer, the low temperature side first refrigerant has a low temperature side compressor (10), a low temperature side condenser (11), a cooling expansion valve (14), a defrost compensation evaporator (15), and a low temperature side. It has a circulation path composed of the auxiliary evaporator 18, the liquid separator 19, absorbs the heat of the cold water line and is compressed in the evaporated state to supply heat from the low temperature side condenser 11 to the high temperature side second refrigerant.

The high temperature side second refrigerant includes a high temperature side evaporator 26, a liquid separator 27, a high temperature side compressor 20, a defrost cooling condenser 28, a receiver 24, and a heating expansion valve 25. It has a path, absorbs the heat of the low temperature side first refrigerant, is condensed in the defrost cooling condenser 28 in the compressed state and releases heat to the outside air.

Here, the high temperature side defrost cooling condenser 28 is preferably provided in pairs, and heat discharge to the outside air can be made more smoothly by increasing the contact area with the outside air.

In addition, the discharge end of each of the high temperature side defrost cooling condenser (28a, 28b) is preferably provided with a control valve for controlling the condensation pressure of the high temperature side second refrigerant. Accordingly, even when the outside air temperature is high, the high temperature side second refrigerant may be more liquefied more smoothly, and rapid heat dissipation is possible.

As described above, the present invention is not limited to the above-described embodiments, but may be modified and implemented by those skilled in the art without departing from the scope of the claims of the present invention. Such modifications are within the scope of the present invention.

According to the dual heat pump air-conditioning apparatus of the present invention, stable heating performance is maintained and failure occurrence due to the liquid back phenomenon is minimized, thereby improving stability and durability of the apparatus, and a pair of external evaporators are connected to the low-temperature condenser discharge end. 1 The contact area between the refrigerant and the outside air is increased, so that the evaporation can be more smoothly, and a large amount of heat can be absorbed from the outside air and supplied to the second refrigerant on the high temperature side, thereby improving the heating efficiency of the device. Since the heat source for evaporation of the refrigerant can be continuously supplied, there is an effect that can enable a fast and efficient defrosting operation is an invention of high industrial availability.

Claims

In the two-way heat pump cooling and heating device comprising a low temperature side refrigeration cycle and a high temperature side refrigeration cycle, the low temperature side condenser and the high temperature side evaporator are coupled to each other heat exchange.

The high temperature side compressor discharge end is alternately connected to one of the high temperature side hot water condenser arranged to exchange heat with the hot water line of the hot water tank by the solenoid valve control and the high temperature side defrost cooling condenser arranged to exchange heat with the low temperature side external evaporator.

The low temperature side external evaporator discharge stage includes an evaporation compensation heat exchanger including the high temperature side secondary condenser and the low temperature side secondary evaporator to be connected to a low temperature side secondary evaporator inlet end arranged to exchange heat with a high temperature side secondary condenser.

The high temperature side hot water condenser discharge end is solenoid valve controlled to be connected to the high temperature side evaporator inlet end via the high temperature side auxiliary condenser selectively according to the low temperature side external evaporator side outside air temperature,

The high temperature side hot water condenser discharge end has an evaporation compensation line connected to the high temperature side evaporator inlet end via the high temperature side condenser, and a high temperature heating directly connected to the high temperature side evaporator inlet end without the high temperature side auxiliary condenser. Line is provided,

When the external temperature of the low temperature side evaporator side exceeds the first preset evaporation compensation temperature, the first solenoid valve of the evaporation compensation line is closed and the second solenoid valve of the high temperature heating line is controlled to open.

When the low temperature side external evaporator side outside temperature is less than the first preset evaporation compensation temperature is controlled to open the first solenoid valve of the evaporation compensation line and the second solenoid valve of the high temperature heating line,

A binary heat pump characterized in that the first solenoid valve is opened but the second solenoid valve is controlled to be closed if the outside temperature of the low temperature side external evaporator is less than the second evaporation compensation temperature preset to be less than the first evaporation compensation temperature. Air conditioning unit.
The method of claim 1,

The low temperature side condenser discharge end is provided to be alternately connected to one of the low temperature side defrost compensator and the low temperature side external evaporator arranged to exchange heat with the cold water line of the cold water tank by the solenoid valve control.

And a solenoid valve controlled to be connected to the low temperature side defrost compensation evaporator inlet stage when the high temperature side compressor discharge stage and the high temperature side defrost cooling condenser inlet stage are connected to each other.
The method of claim 1,

The low temperature side external evaporator and the high temperature side defrost cooling condenser are provided in pairs, respectively.

The low temperature side condenser discharge end is branched in pairs to be connected to each of the low temperature side external evaporators, and an external evaporation line having a low temperature side heating expansion edge is connected to each branched portion,

Each of the high-temperature side defrost cooling condenser discharge end is provided with a pressure control valve for adjusting the condensation pressure of the high-temperature side second refrigerant.
The method of claim 1,

The capacity ratio between the low temperature side compressor of the low temperature side refrigeration cycle and the high temperature side compressor of the high temperature side refrigeration cycle is configured in a ratio of 1: 1,

The dual heat pump air-conditioning device is characterized in that the blow fan rotation speed of the low temperature side external evaporator is controlled to be decelerated when the outside temperature of the low temperature side external evaporator is higher than a preset excessive temperature to prevent overcompression of the low temperature side compressor.