KR101212684B1

KR101212684B1 - Hot water supply device associated with heat pump and control method thereof

Info

Publication number: KR101212684B1
Application number: KR1020100139326A
Authority: KR
Inventors: 하종철; 이동혁
Original assignee: 엘지전자 주식회사
Priority date: 2010-12-30
Filing date: 2010-12-30
Publication date: 2013-01-09
Also published as: KR20120077389A

Abstract

The present invention relates to a heat pump interlocking hot water supply device, and in particular, a deficiency of heating water due to a shortage of defrosting time during defrost mode operation and a decrease in heating water due to a decrease in ambient temperature during heating mode operation. It solves by replenishing the hot water supply through it provides an advantage to improve the customer satisfaction.

Description

Hot water supply device associated with heat pump and control method

The present invention relates to a heat pump interlocking hot water supply device and a control method thereof, and more particularly, a lack of heating water due to a long defrost time during defrost mode operation and a shortage of heating water due to a decrease in ambient temperature during heating mode operation. The present invention relates to a heat pump interlocking hot water supply device capable of improving consumer satisfaction by solving the phenomenon by supplementing hot water through a bypass replenishment flow passage.

In general, a hot water supply device is a device that provides hot water to a user by heating water with a heating source. At this time, the water is heated by the heat pump, the device for providing hot water to the user may be referred to as a heat pump interlocking hot water supply device.

1 is a structural diagram showing a flow of a refrigerant by a binary refrigerant refrigeration cycle according to the prior art.

As shown in FIG. 1, the dual refrigerant refrigeration cycle according to the related art includes a first compressor 5 compressing the first refrigerant and a first condenser in which the first refrigerant discharged from the first compressor 5 is condensed. 20, the first expansion mechanism 15 through which the first refrigerant passed through the first condenser 20 is expanded, and the first evaporator through which the first refrigerant expanded by the first expansion mechanism 15 is evaporated. 10) and a refrigerant pipe connecting the first compressor 5, the first condenser 20, the first expansion mechanism 15, and the first evaporator 10 to form a first refrigerant cycle (I) (Fig. Unsigned) and the like.

In addition, the binary refrigerant refrigeration cycle according to the prior art, as shown in Figure 1, the second compressor 25 for compressing the second refrigerant, and the second refrigerant discharged from the second compressor 25 is condensed The second condenser 40, the second expansion mechanism 15 through which the second refrigerant passing through the second condenser 40 is expanded, and the second refrigerant expanded by the second expansion mechanism 15 is evaporated. A refrigerant pipe connecting the evaporator 20, the second compressor 25, the second condenser 40, the second expansion mechanism 15 and the second evaporator 20 to form a second refrigerant cycle (II). (Not shown).

Here, the first condenser and the second evaporator have the same configuration, and constitute a so-called dual refrigerant refrigeration cycle in which one refrigerant evaporates while the other refrigerant condenses while intersecting the first refrigerant and the second refrigerant. It is a kind of heat exchanger.

On the other hand, the water circulation unit 50 for supplying the use water for indoor heating or floor heating may be configured to exchange heat with the condensation second refrigerant of the second condenser 40. Reference numeral 45 denotes outdoor air that is heat-exchanged with the first refrigerant of the first evaporator 10 which serves as an outdoor heat exchanger.

In the course of the refrigerant flowing in the binary refrigerant refrigeration cycle, the refrigerant eventually absorbs heat in the evaporator to release heat from the condenser. The heat pump interlocked hot water supply device is capable of performing hot water supply in such a manner that a refrigerant transfers heat to the use water of the hot water supply device.

However, the heat pump interlocking hot water supply apparatus according to the prior art temporarily stops the heating mode operation as a result of temporarily operating the heat pump in the cooling mode operation for defrosting the outdoor heat exchanger during the defrost mode operation of defrosting the outdoor heat exchanger. There is a problem to be done.

In addition, the heat pump interlocking hot water supply apparatus according to the prior art, when the outdoor air temperature is sharply lowered, the starting efficiency of the compressor does not correspond to the sharply lowered outdoor temperature, causing the indoor residents to feel a relatively cold to achieve a sufficient heating effect There is this.

The present invention has been made to solve the above technical problem, the lack of heating water due to the long defrost time during defrost mode operation and the shortage of heating water due to the decrease in the outside air temperature during heating mode operation as a bypass replenishment oil The purpose of the present invention is to provide a heat pump interlocking hot water supply device and a control method thereof, which can be solved by replenishing hot water through the water supply, thereby improving customer satisfaction.

The heat pump interlocking hot water supply apparatus according to the present invention includes a first compressor for compressing a first refrigerant, a first water circulation unit through which heating water is circulated so as to perform heating in a room, and the first refrigerant and the first water circulation unit. A first use heat exchanger in which the heating water is heat-exchanged with each other, a second compressor for compressing the second refrigerant, a second water circulation unit through which the hot water is flowed to perform a hot water supply, and a water supply water in the second refrigerant and the second water circulation unit A second heat exchanger for heat exchange, a cascade heat exchanger for mutually heat-exchanging a portion of the first refrigerant and the second refrigerant discharged from the first compressor, and a first condensed by the first use heat exchanger and the cascade heat exchanger An outdoor heat exchanger for evaporating a refrigerant, connecting the first water circulation unit and the second water circulation unit, and operating in any one of a heating operation mode, a cooling mode operation, and a defrost operation mode. And optionally, a bypass replenishment passage for replenishing the hot water of the second water circulation part with the heating water of the first water circulation part.

Here, the heating water pump disposed in the first water circulation portion, the heating water pump for pumping the heating water of the first water circulation portion, and the hot water supply disposed in the second water circulation portion, pumping the hot water supply of the second water circulation portion And a water pump, wherein the bypass replenishment flow passage is closer to the heating water pump and the hot water supply pump based on the hot water outlet of the first use heat exchanger and the hot water outlet of the second use heat exchanger. Inlet and outlet may be connected to.

In addition, the pump may further include a replenishment flow passage disposed on the bypass replenishment flow passage.

The inlet and outlet of the bypass replenishment flow passage are connected to the first water circulation part and the second water circulation part by an on / off valve, and each of the on / off valves is a heating operation mode, a cooling mode operation, and a defrost. When operating in any one of the mode operation can be selectively switched.

In addition, the on-off valve connected to the inlet end of the bypass replenishment flow passage is controlled to be opened so that the bypass replenishment flow passage is activated when the outside air temperature is less than or equal to a first predetermined temperature during the heating mode operation of the heat pump interlocking hot water supply device. Do.

In addition, the on-off valve connected to the inlet of the bypass replenishment flow passage is preferably controlled to be opened so that the bypass replenishment flow passage is activated during the defrost mode operation of the heat pump interlocking hot water supply device.

On the other hand, the first refrigerant compressed by the first compressor is a first refrigerant circulating unit for circulating the first use heat exchanger and the outdoor heat exchanger to perform the cooling / heating, and the compressed by the second compressor In the heating mode operation or the defrost mode operation of the second refrigerant circulation unit for circulating the second heat exchanger and the cascade heat exchanger to perform the hot water supply of the second refrigerant, and the defrost mode operation, A first refrigerant injection circuit branched from the first refrigerant circulator so as to be injected into the first compressor and connected to the first compressor, and a gas refrigerant of the second refrigerant injected into the second compressor The apparatus may further include a second refrigerant injection circuit branched from the second refrigerant circulation part and connected to the second compressor.

Here, the first refrigerant injection circuit and the second refrigerant injection circuit are controlled to be activated when the outside air temperature is lower than or equal to the second preset temperature.

In addition, a first gas liquid separator and a second gas liquid separator for separating the refrigerant flowing through the first refrigerant injection circuit and the second refrigerant injection circuit into a liquid refrigerant and an air refrigerant are respectively the first refrigerant injection circuit and the second refrigerant. It can be placed in the injection circuit.

In the control method of the heat pump interlocking hot water supply apparatus according to the present invention, when the power is applied, the first compressor and the second compressor are operated such that the first refrigerant circulates the first refrigerant circulation section and the second refrigerant circulates the second refrigerant circulation section. Comparing the current heating temperature and the target heating temperature with respect to the operation rates of the first compressor and the second compressor according to the outside air temperature after the first step, and circulating the second water circulation unit while circulating the second water circulation unit. And a second opening / closing bypass bypass that connects the first water circulation part and the second water circulation part to replenish the hot water exchanged with the first water circulation part while circulating the first water circulation part. Steps.

Here, in the second step, the target heating temperature is higher than the current heating temperature, the heating water heat-exchanged with the first refrigerant compressed by the first compressor and the second refrigerant compressed by the second compressor When the temperature is lower than the heat exchange hot water supply may be a step of opening the bypass replenishment flow path.

The second step may include opening the bypass supplement flow passage when the first compressor is operated in a defrosting operation mode when the target heating temperature is lower than the current heating temperature.

In addition, the first water circulating unit and the second water circulating unit are connected to recover the heating water from the first water circulating unit to the second water circulating unit at the same time as the opening and closing control of the bypass replenishment passage in the second step. The method may further include a third step of opening and closing the heating water recovery flow path.

In addition, the second step may be a step of opening the bypass replenishment flow passage only when the second compressor is in operation.

The third step may include opening the bypass refill oil and opening the heating water recovery flow passage only when the second compressor is in operation.

In the heat pump interlocking hot water supply device and its control method according to the present invention, in a place such as a cold district where the outdoor air temperature is rapidly lowered during the heating mode operation, the hot water is supplied to the heating water for the heating by-pass to the external air temperature. Because it is supplemented through it has the effect of improving the heating quality of indoor occupants.

In addition, the heat pump interlocking hot water supply device and the control method according to the present invention, even in the defrost mode operation, even if the heating mode operation is stopped, the hot water supply can be supplemented with the heating water through the bypass replenishment flow path, so even if the defrost time is long In addition to preventing the deterioration of the heating quality, it has the effect of achieving a rapid defrost.

1 is a structural diagram showing a flow of a refrigerant by a binary refrigerant refrigeration cycle according to the prior art,
2 is a block diagram showing the entire piping of the heat pump interlocking hot water supply apparatus according to the present invention,
3 is a block diagram showing a refrigerant flow in the heating mode operation of the heat pump interlocking hot water supply apparatus according to the present invention,
4 is a block diagram showing the flow of the refrigerant during the defrost mode operation of the heat pump interlocking hot water supply apparatus according to the present invention,
5 is a block diagram schematically showing a control method of a heat pump interlocking hot water supply device according to the present invention.

Hereinafter, a preferred embodiment of a heat pump interlocking hot water supply device and a control method according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a block diagram showing the entire piping of the heat pump interlocking hot water supply apparatus according to the present invention.

In the heat pump interlocking hot water supply device according to the present invention, as shown in FIG. 2, the first compressor 105 compresses the first refrigerant and the first refrigerant condensed by the first compressor 105. A first condenser 110, a first expansion mechanism 135a for expanding the first refrigerant condensed by the first condenser 110, and a first refrigerant for evaporating the first refrigerant expanded by the first expansion mechanism 135a. One evaporator 160 is included.

Here, the first refrigerant is a refrigerant having a boiling point different from that of the second refrigerant described later, and the first refrigerant is easier to be evaporated or compressed under a lower temperature and a lower pressure than the second refrigerant. In particular, in the present invention, a description will be made of R-410A in the case of the first refrigerant, and R-134a in the case of the second refrigerant. It is already known that R-134a evaporates or compresses at higher temperatures and pressures than R-410A.

As described above, the flow of the refrigerant circulated through the first compressor 105, the first condenser 110, the first expansion mechanism 135a, and the first evaporator 160 is described for convenience of description. The first refrigerant circulation unit (not shown) is referred to, and the refrigerant discharged from the first compressor 105 is introduced into the first condenser 110, the first condenser 110 is also disposed in the room, It may be placed outdoors. At this time, the condenser disposed indoors is called an indoor heat exchanger 160, and the condenser arranged outdoors is called an outdoor heat exchanger 110.

When the indoor heat exchanger 160 condenses the refrigerant, the first refrigerant circulates the first refrigerant circulation unit for heating the room. When the indoor heat exchanger 160 performs the evaporation of the refrigerant, 1 A refrigerant is circulated for cooling the room.

As such, the outdoor heat exchanger 110 acting as a condenser first to flow the refrigerant so that the function of the indoor heat exchanger 160 varies according to the operation of the indoor / cooling mode of the first refrigerant compressed by the first compressor 105. Whether to circulate to the side or to the indoor heat exchanger 160 side is determined by the first switching valve 107 disposed in the first refrigerant circulation.

The first switching valve 107 is a four-way valve, and when the cooling mode operation of the room is required, the first switching valve 107 switches the refrigerant compressed from the first compressor 105 to the outdoor heat exchanger 110 in order to condense the refrigerant, and indoors. When the heating mode is required, the first compressor 105 serves to switch the refrigerant compressed to the indoor heat exchanger 160 to condense the refrigerant.

In addition, the first expansion mechanism (135a) is a first condensing agent that is sufficiently condensed before entering the heat exchanger of any one of the indoor heat exchanger (160) or the outdoor heat exchanger (110) that evaporates after condensing by the condenser 1 serves to expand the refrigerant.

The refrigerant expanded by the first expansion mechanism 135a is introduced into any one of the indoor heat exchanger 160 or the outdoor heat exchanger 110 serving as the first evaporator 160 to exchange heat and cause a phase change. The first refrigerant flows back into the first compressor 105 to form a predetermined refrigerant cycle.

However, the indoor heat exchanger 160 does not necessarily exchange heat with the first refrigerant in the process of condensing or evaporating with the indoor air. That is, in some cases, the heat exchange with the first refrigerant in the process of condensation or evaporation may be first water used for a special purpose, not indoor air.

For example, the first user water may be floor heating water that circulates the indoor floor heating unit 170 for floor heating, not indoor space heating, and circulates a heat supply unit 180 such as a radiator disposed indoors. It may be heating water.

On the other hand, since the heat exchanger that condenses the second refrigerant compressed by the second compressor 125 to be described later should also be regarded as a kind of indoor heat exchanger 160, it is compressed by the first compressor 105 to avoid confusion. The indoor heat exchanger 160 that condenses or evaporates the second refrigerant will be collectively referred to as a first use heat exchanger 160.

As described above, the first refrigerant circulating in the first use heat exchanger 160 raises the temperature of the first use water while being condensed by heat exchange with the first use water, and the elevated first use water is heating water for floor heating. Circulated to Here, the water pipe part for circulating the indoor floor heating unit 170 or the heat supply unit 180 in the first user water is collectively referred to as a first water circulation part 150a.

As shown in FIG. 2, the heating water, which is the first water of the first water circulation unit 150a, exchanges heat with the first refrigerant while passing through the first use heat exchanger 160 to condense the first refrigerant, and Discharge to the heating water outlet of the single-use heat exchanger 160 (point indicated by reference numeral a) to cool / heat the room while circulating the floor heating unit 170 or the heat supply unit 180, and then It is circulated to the heating water inlet (not shown) of the one-use heat exchanger (160). As such, the heating water pump 210 may be installed in the first water circulation unit 150a to circulate the heating water of the first water circulation unit 150a.

In addition, the first water circulation unit 150a is a floor heating unit in the room connected to the floor heating pipe indicated by reference numeral 151 in one first water circulation unit 150a as indicated by reference numeral b of FIG. 2. It is also configured to be branched to the heat supply unit 180 is connected to the heat supply unit 180 and the heat fluid supply pipe indicated by the reference numeral 152 to perform a predetermined heating and then merged into one first water circulation unit (150a) again. It is possible.

The heating water pump 210 includes the heating water outlet of the first use heat exchanger 160 among the first water circulation units 150a and the floor heating unit 170 and the heat supply unit 180 indicated by reference numeral b in FIG. 2. It is preferable to arrange between).

Meanwhile, in the heat pump interlocking hot water supply device according to the present invention, as shown in FIG. 2, the second compressor 125 compressing the second refrigerant and the second refrigerant compressed by the second compressor 125 are condensed. To the second condenser 140, the second expansion mechanism 135b to expand the second refrigerant condensed by the second condenser 140, and the second refrigerant expanded by the second expansion mechanism 135b to evaporate. A second evaporator 120 to be included.

Here, as described above, the second condenser 140 for condensing the second refrigerant compressed by the second compressor 125 is a heat exchanger that serves to increase the temperature of the hot water, which is the second user water, to be described later. In order to avoid confusion with the first use heat exchanger 160, it will be referred to as a second use heat exchanger 140 hereinafter.

In addition, the second refrigerant compressed by the second compressor 125 is condensed by the first use heat exchanger 160 and then expanded by the second expansion mechanism 135b and then introduced into the evaporator to undergo an evaporation process. The second compressor 125 is circulated again, and the circulation cycle of the second refrigerant circulated in this manner will be referred to as a second refrigerant circulation portion (not shown) corresponding to the first refrigerant circulation portion.

However, it should be noted that the evaporator herein is not the outdoor heat exchanger 110 in the first refrigerant circulation. The second refrigerant of the second refrigerant circulator cannot be mixed with the first refrigerant and thus requires a separate evaporator. However, the installation of a separate evaporator in a separate outdoor space causes an increase in cost. In the present invention, the high temperature is increased by the first compressor 105 of the first refrigerant circulating the first refrigerant circulation to serve as the evaporator. The heat exchanger is configured to bypass the portion of the first refrigerant compressed at a high pressure and heat exchange with the second refrigerant circulating in the second refrigerant circulation to condense the second refrigerant and conversely condense the first refrigerant. The heat exchanger for exchanging heat while intersecting the first refrigerant and the second refrigerant herein will be referred to as a cascade heat exchanger 120 for convenience of description.

The cascade heat exchanger 120 is a binary structure configured to enable evaporation and condensation while mutually heat-exchanging refrigerants having different specifications from each other (in the present invention, for example, R-410A and R-134a as the first and second refrigerants). It forms an axis of the refrigeration cycle.

The second refrigerant compressed by the second compressor 125 may generally be configured to flow directly to the second use heat exchanger 140 so that the second use heat exchanger 140 condenses, but the first refrigerant circulation The second switching valve (not shown), such as the first switching valve 107 in the portion is provided with a second use heat exchanger 140 or a cascade heat exchanger (2) according to the cooling / heating mode of operation of the compressed second refrigerant. It is also possible to be configured to determine whether or not to switch to 120.

Like the first use heat exchanger 160, the second use heat exchanger 140 does not necessarily exchange heat with the second refrigerant in the process of condensing with the indoor air. That is, in some cases, the heat exchange with the second refrigerant of the condensation process may be the second water used for a special purpose, not indoor air.

For example, the second user water may be hot water circulated for use in a bathroom or a kitchen, not floor heating water circulated for indoor space heating and floor heating. However, the second user heat exchanged immediately by the second use heat exchanger 140 should not be used as the hot water supply, but the second user water passes through the hot water supply tank 191 in which the hot water is stored for a separate hot water supply. It is also possible to be configured to enable by raising the temperature of.

As such, a second cycle of the second refrigerant that is compressed by the second compressor 125 and the second user water that is heat-exchanged in the second use heat exchanger 140 and circulated back to the hot water supply tank 191 is provided for the convenience of description. The water circulation unit 150b may be referred to, and a hot water supply pump 155 may be disposed in the second water circulation unit 150b for smooth circulation of the second water.

The hot water supply pump 155 is a hot water supply water outlet (a point indicated by reference numeral c) of the second heat exchanger 140 among the second water circulation parts 150b and a hot water indicated by reference numeral d in FIG. 2. It is preferably arranged between the jaws 191.

As shown in FIG. 2, the hot water is introduced into the hot water tank 191 and heat-exchanged with the second user water, and then is supplied to the hot water tank discharge unit 190 through the hot water tank outlet c.

Meanwhile, in the heat pump interlocking hot water supply device according to the present invention, as shown in FIG. 2, the hot water supply of the second water circulation part 150b may be supplemented with the heating water of the first water circulation part 150a. It further includes a bypass replenishment flow path 300 connecting the water circulation unit 150a and the second water circulation unit 150b.

Bypass replenishment flow path 300, when the outside air temperature is lowered, that is, the required load value of the hot water supply apparatus according to the present invention is larger than the performance of the compression performance by the first compressor 105 only by the consumer to provide heating such as floor heating desired by the consumer. When it is difficult to expect when the consumer feels dissatisfied due to lack of rising heating water temperature, replenishing the hot water of the second water circulation unit 150b having a relatively high temperature with the heating water of the first water circulation unit 150a. It is for the configuration.

On the other hand, although the bypass replenishment flow path 300 is a useful configuration in a cold district with low outside air temperature, it is also very useful in defrost mode operation for defrosting the outdoor heat exchanger 110. That is, in order to defrost the outdoor heat exchanger 110, the refrigerant compressed by the first compressor 105 temporarily flows directly to the outdoor heat exchanger 110 by the first switching valve 107 to condense. It is common to defrost, in which case, the first use heat exchanger 160 may have a lack of floor heating for a resident living in the room by evaporation. In particular, when the defrosting time of the outdoor heat exchanger 110 is unexpectedly long, dissatisfaction felt by the consumer may increase compared to the defrosting time. The bypass replenishment flow path 300 is a configuration that can solve the problem briefly, in particular, the temperature drop of the heating water heat exchanged in the first use heat exchanger 160 during the defrost mode operation of the heat pump interlocking hot water supply apparatus according to the present invention It performs a function of preventing by supplementing the hot water through the bypass replenishment flow path (300).

Bypass replenishment flow path 300, which is a connection point between the bypass replenishment flow path 300 and the second recirculation flow path 150b and the first water recirculation part 150a, respectively, It is connected by the on-off valve 220, 225. Opening and closing valves 220 and 225 are valves for connecting three pipes, and may be configured to regulate the amount of fluid flowing through the pipe by controlling the opening of the fluid flowing through the pipe or adjusting the opening degree. Hereinafter, for convenience of description, the on / off valve connected to the first water circulation unit 150a will be referred to as a first open / close valve 225, and the on / off valve connected to the second water circulation unit 150b will be referred to as a second open / close valve. It is referred to as (220).

The hot water inlet and outlet of the first open / close valve 225 and the second open / close valve 220, that is, the bypass replenishment flow path 300, are the heating water outlet and the second outlet of the first use heat exchanger 160. The hot water supply outlet of the utilization heat exchanger 140 is connected to a portion closer to the heating water pump 210 and the hot water pump 155.

In this way, the inlet and outlet of the bypass replenishment flow path 300 is provided in the front of the heating water pump 210 and the hot water supply pump 155, the first opening and closing valve 225 and the second opening and closing simply By controlling the opening and closing of the valve 220, the hot water supply water is automatically replenished with the heating water by the pumping power of the heating water pump 210 and the hot water pump 155, respectively.

However, more preferably, the replenishment channel pump 310 is provided directly on the bypass replenishment channel 300. When the replenishment channel 300 is directly provided on the bypass replenishment passage 300, when the bypass replenishment passage 300 is long and the pumping power by the heating water pump 210 is weak, actively supplying the hot water to the heating water. There is an advantage to supplement.

The configuration indicated by the reference numeral 104 is a refrigerant compensator for compensating the first refrigerant before the first refrigerant flows into the first compressor 105, or separates the first refrigerant into an air refrigerant and a liquid refrigerant to separate the first refrigerant. It may be a gas-liquid separator introduced into the compressor 105.

On the other hand, as shown in Figures 2 to 4, the heat pump interlocking hot water supply apparatus according to the present invention, branched from the first refrigerant circulation portion so that the gas refrigerant of the first refrigerant is injected into the first compressor 105, the first The first refrigerant injection circuit 500 is connected to the compressor 105 and the gas refrigerant of the second refrigerant is branched from the second refrigerant circulation to be injected into the second compressor 125 is connected to the second compressor 125 The second refrigerant injection circuit 600 may further include.

Each of the first refrigerant injection circuit 500 and the second refrigerant injection circuit 600 may be connected to one injection port formed in the first compressor 105 and the second compressor 125, respectively, or the first compressor 105 And a double refrigerant injection circuit respectively connected to two injection ports formed in the second compressor 125.

The first coolant injection circuit 500 and the second coolant injection circuit 600 may be configured such that required load values for heating mode operation or defrost mode operation of the heat pump interlocking hot water supply device are respectively set to the first compressor 105 and the first compressor injection circuit. It is very useful when larger than the starting performance of the two compressors 125. That is, when the starting performance of the first compressor 105 and the second compressor 125 does not meet the required load value, the insufficient refrigerant is directly added through the first refrigerant injection circuit 500 or the second refrigerant injection circuit 600. Injection into the first compressor 105 or the second compressor 125 has the advantage of increasing the discharge temperature and discharge pressure of each refrigerant.

Here, although not shown in the drawing on the first refrigerant injection circuit 500 and the second refrigerant injection circuit 600, a first gas liquid separator or a second gas liquid separator for separating a liquid refrigerant into a gas refrigerant may be installed, respectively. Of course.

On the other hand, a preferred embodiment of the heat pump interlocking hot water supply apparatus according to the present invention, the hot water is supplemented through the bypass replenishment flow path 300, as shown in Figures 2 to 4 again the first water circulation (150a) The heating water recovery passage 400 further comprises a first water circulation unit 150a and a second water circulation 150b so as to be recovered to the second water circulation unit 150b.

The heating water recovery flow passage 400 includes a second water circulation before the hot water is introduced into the first water circulation unit 150a and the second use heat exchanger 140 before the heating water flows into the first use heat exchanger 160. It may be configured to connect the unit 150b.

Such a heating water recovery passage 400 is typically controlled to be opened together when the bypass replenishment passage 300 is opened and the hot water is replenished with the heating water.

The operation of each of the heating mode operation and the cooling mode operation (or the defrost mode operation) of the heat pump interlocking hot water supply apparatus according to the present invention configured as described above will be described in detail with reference to the accompanying drawings. .

First, when the heating mode operation signal is input to the heat pump interlocking hot water supply apparatus according to the present invention in the case of a low winter outside temperature, as shown in Figure 3, the first compressed by the high pressure / high pressure by the compressor (105) The first refrigerant is switched to the first use heat exchanger 160 by the first switching valve 107 and flows therein, and the first refrigerant introduced into the first use heat exchanger 160 is connected to the first water circulation part 150a. Heat exchanged with the flowing heating water is condensed while increasing the temperature of the heating water is passed through the first expansion mechanism (135a) and again heat exchanged with the outdoor air in the outdoor heat exchanger 110 and evaporated and then circulated to the first compressor (105) A first refrigerant circulation section is constituted.

At the same time, a portion of the first refrigerant compressed at high temperature / high pressure by the first compressor 105 is switched to the cascade heat exchanger 120 side between the first switching valve 107 and flows, and the cascade heat exchanger 120 In the heat exchange with the second refrigerant flowing in the second refrigerant circulation to be described later the first refrigerant is condensed while the second refrigerant is evaporated.

Meanwhile, at the same time, the second refrigerant compressed at high temperature / high pressure by the second compressor 125 is switched to the second use heat exchanger 140 by the second switching valve, and flows therein, and the second use heat exchanger 140 flows. The second refrigerant introduced into the heat exchanger is heat-exchanged with the hot water supply, which is the second user water flowing through the second water circulation part 150b, to condense while raising the temperature of the hot water, and then passes through the second expansion mechanism 135b to cascade heat exchanger. 120).

However, there is no problem in the heating mode operation of the heat pump interlocking hot water supply device at such a normal demand load value, but for example, when the demand load value of the heat pump interlocking hot water supply device is large, such as in a cold district, the consumer has a large demand. There is a problem that can decrease the satisfaction such as indoor floor heating. That is, it is preferable that the temperature of the heating water to perform indoor floor heating corresponding to the outside temperature is also increased, but there is a problem in that it is not possible to start an appropriate required load value by hitting the limit of the standard capacity of the first compressor 105. .

At this time, a preferred embodiment of the heat pump interlocking hot water supply apparatus according to the present invention, by opening the bypass replenishment flow path 300, the first water circulation of the hot water of the relatively high temperature of the second water circulation unit (150b) The problem can be solved by supplementing the relatively low temperature heating water of the part 150a.

In addition, the heat pump interlocking hot water supply apparatus according to the present invention, by adjusting the opening degree of the first opening and closing valve 225 or the second opening and closing valve 220 in response to the rate of drop in the outside temperature flows the bypass replenishment flow path (300) By adjusting the amount of hot water supply, it is natural that the hot water supply corresponding to the required load value can be provided.

The operating principle of the heat pump interlocking hot water supply device according to the present invention as described above can be more usefully applied especially during the defrost mode operation of the hot water supply device.

For example, when defrosting of the outdoor heat exchanger 110 is required during the heating mode operation of the heat pump interlocking hot water supply device according to the present invention, when the defrost mode operation signal is input, the first switching valve 107 temporarily cools down. In order to convert the high temperature / high pressure first refrigerant compressed by the first compressor 105 to the outdoor heat exchanger 110 to allow the outdoor heat exchanger 110 to condense.

At this time, the first use heat exchanger 160 side is evaporated, the heating water that is heat-exchanged in the first use heat exchanger 160 that evaporates the bar may be reduced in temperature, bypass supplement flow path 300 By controlling the opening of the hot water to replenish the hot water to prevent the floor heating in the room during defrosting can be prevented. In particular, when the defrosting time is very long, it will have the advantage of resolving consumer complaints by continuously supplying hot water.

Next, when the cooling mode operation signal is input to the heat pump interlocking hot water supply apparatus according to the present invention in the summer when the outdoor temperature is high, as shown in FIG. 4, the first compressor 105 is compressed to high temperature / high pressure. The first refrigerant is switched to the outdoor heat exchanger 110 by the first switching valve 107 and flows, the first refrigerant introduced into the outdoor heat exchanger 110 is condensed by heat exchange with the outdoor air, the first condensed The refrigerant constitutes a first refrigerant circulation unit circulated to the first compressor 105 after being evaporated through the first utilization heat exchanger 160 through the first expansion mechanism 135a.

At this time, the second compressor 125 constituting the second refrigerant circulation unit does not need to be started, and the configuration of another first refrigerant circulation unit for flowing the first refrigerant to the cascade heat exchanger 120 is also not necessary. At this time, it is sufficient to close the bypass replenishment flow path 300 and stop the flow of hot water on the bypass replenishment flow path 300.

Hereinafter, a preferred embodiment of a control method of a heat pump interlocking hot water supply device according to the present invention will be described in detail with reference to the accompanying drawings (particularly, FIG. 5).

FIG. 5 is a block diagram schematically illustrating a control method of a heat pump interlocking hot water supply device according to the present invention. Referring to FIG. 5, the heat pump interlocking hot water supply device according to the present invention may include a first refrigerant when power is applied. A first step S20 of circulating the first refrigerant circulation unit and operating the first compressor 105 and the second compressor 125 so that the second refrigerant circulates the second refrigerant circulation unit, and the outside air temperature after the first step S10. Compared to the operation rate of the first compressor 105 and the second compressor 125 according to the current heating temperature and the target heating temperature, the hot water is exchanged with the second refrigerant while circulating the second water circulation unit (150b) The bypass replenishment flow path 300 connecting the first water circulation part 150a and the second water circulation part 150b to circulate the first water circulation part 150a and replenish the heating water heat exchanged with the first refrigerant. And a second step S20 of opening and closing.

Here, although the target heating temperature is generally set to rise in response to the decrease rate of the outside air temperature, the target heating temperature is not necessarily set as such, but the maximum heating temperature may be set, and a certain ratio is assumed that the outside air temperature falls. Note that the furnace is not set to raise the target heating temperature.

Here, the second step (S20), the target heating temperature is higher than the current heating temperature because the outside air temperature is low, the heating water heat exchanged with the first refrigerant compressed by the first compressor 105 to the second compressor 125 The bypass refill passage 300 may be opened when the temperature of the hot water is lower than that of the compressed second refrigerant. This is because it is not necessary to open the bypass replenishment flow path 300 when the heating water that is heat-exchanged with the first refrigerant is higher than the hot water that is heat-exchanged with the second refrigerant.

However, the second step S20 of opening and closing the bypass replenishment flow path 300 is not necessarily controlled only under the above-described conditions. That is, the second step (S20), in the case of the operation of the winter product in which the target heating temperature is lower than the current heating temperature, when the first compressor 105 is operated in the defrost operation mode, opening control of the bypass replenishment flow path 300 It may be a step.

In the present invention, the common condition that the bypass compressor flow path 300 is open when the second compressor 125 is in operation is established in common in the cold operation mode or the defrost operation mode. When the second compressor 125 is not operating, activation of the bypass replenishment flow passage is unnecessary.

On the other hand, a preferred embodiment of the control method of the heat pump interlocking hot water supply apparatus according to the present invention, the heating water from the first water circulating unit to the second water circulating unit simultaneously with the opening and closing control of the bypass replenishment passage in the second step (S20) The method may further include a third step (not shown) of controlling the opening and closing of the heating water recovery flow path connecting the first water circulation part and the second water circulation part to recover the water.

Similarly, since the control of the third step is to be linked to the control of the bypass replenishment flow path 300 of the second step S20, it will be considered necessary only when the second compressor 125 is in operation.

The control method of the heat pump interlocking hot water supply device according to the present invention, the current heating temperature of the room at the time of defrost mode operation that requires defrosting operation of the outdoor heat exchanger in cold climate mode operation or the outdoor air temperature is rapidly reduced Since the hot water is replenished with heating water so as not to cause inconvenience due to the fall, the user's convenience and product reliability are improved.

In the above, the main configuration and operation of the heat pump interlocking hot water supply apparatus and a control method according to the present invention have been described in detail with reference to the accompanying drawings. However, the embodiment of the present invention is not limited to the above-described preferred embodiment, it is obvious that it can be carried out in various modifications and equivalent ranges by those skilled in the art. Therefore, the true scope of the present invention will be defined by the claims below.

104: gas-liquid separator 105: first compressor
107: first switching valve 110: outdoor heat exchanger
120: cascade heat exchanger 135: first, second expansion mechanism
140: second use heat exchanger 150a: first water circulation
150b: second water circulation 160: first heat exchanger
170: indoor floor heating unit 180: heat supply unit
210: heating water pump 220: second opening and closing valve
225: second opening and closing valve 300: bypass replenishment flow path
310: replenishment flow path pump 400: heating water recovery flow path
500: first refrigerant injection circuit 600: second refrigerant injection circuit

Claims

Condensation by the first compressor 105 for compressing the first refrigerant, the first condenser 110 for condensing the first refrigerant compressed by the first compressor 105, and the first condenser 110 A first expansion mechanism 135a for expanding the first refrigerant, a first evaporator 160 for evaporating the first refrigerant expanded by the first expansion mechanism 135a, and again the first compressor 105 A first refrigerant circulating unit configured to circulate the first refrigerant;
A first water circulation unit 150a through which the heating water is circulated so as to perform indoor heating;
The second compressor 125 compresses the second refrigerant, the second condenser 140 condensing the second refrigerant compressed by the second compressor 125, and the second condenser 140 A second expansion mechanism 135b for expanding the second refrigerant, a second evaporator 120 for evaporating the second refrigerant expanded by the second expansion mechanism 135b, and again the second compressor 125 A second refrigerant circulation unit configured to circulate the second refrigerant;
A second water circulation part 150b through which the hot water flows to perform the hot water supply,
The first evaporator 160 is a first use heat exchanger 160 for mutual heat exchange between the first refrigerant and the heating water of the first water circulation unit 150a.
The second condenser 140 is a second use heat exchanger 140 for mutual heat exchange between the second refrigerant and the hot water of the second water circulation part 150b,
The second evaporator 120 is a cascade heat exchanger for exchanging a part of the first refrigerant discharged from the first compressor 105 and the second refrigerant discharged from the second compressor,
An outdoor heat exchanger (110) for evaporating the first refrigerant condensed by the first use heat exchanger (160) and the cascade heat exchanger (120);
The first water circulation unit 150a and the second water circulation unit 150b are connected to each other, and when it is necessary to increase the temperature of the first water circulation unit 150a during operation, the second water circulation unit ( Heat pump interlocking hot water supply apparatus further comprises a bypass replenishment flow path 300 for replenishing the hot water of the water supply (150b) with the heating water of the first water circulation (150a).

The method according to claim 1,
A heating water pump disposed in the first water circulation unit and configured to circulate the heating water of the first water circulation unit to the first use heat exchanger to exchange heat with the first refrigerant;
A hot water pump disposed in the second water circulation part and configured to circulate the hot water supply water to the second use heat exchanger to exchange heat with the second refrigerant;
The bypass replenishing flow passage may include an inlet end and an outlet end closer to the heating water pump and the hot water supply pump based on the heating water outlet of the first use heat exchanger and the hot water outlet of the second use heat exchanger. This is connected to the heat pump interlock hot water supply device.

The method according to claim 2,
The hot water flowing through the bypass replenishment flow passage,
The heat pump interlocking hot water supply device is supplemented with heating water by the heating water pump or the hot water supply pump, or supplemented with heating water by a replenishment passage pump disposed on the bypass replenishment passage.

The method according to claim 2,
The inlet end and the outlet end of the bypass supplement flow passage are connected to the first water circulation part and the second water circulation part by an on / off valve,
Each of the on and off valves is selectively opened and closed when the heat pump is operated in any one of the heating operation mode, cooling mode operation and defrost mode operation.

The method of claim 4,
The on-off valve connected to the inlet end of the bypass refill passage,
And a heat pump interlocking hot water supply device configured to control the bypass replenishment flow path to be activated when the outside air temperature is lower than or equal to a first predetermined temperature during the heating mode operation of the heat pump interlocking hot water supply device or when the defrost mode operation of the heat pump interlocking hot water supply device is activated.

The method of claim 4,
The first water circulation unit before the heating water flows into the first utilization heat exchanger and the second water circulation unit before the hot water supply flows into the second utilization heat exchanger, and the heating water replenished through the bypass replenishment passage And a heating water recovery passage for recovering the water circulation unit from the first water circulation unit to the second water circulation unit.

The method according to claim 5 or 6,
A first refrigerant circulation unit configured to circulate the first use heat exchanger and the outdoor heat exchanger to perform cooling / heating of the first refrigerant compressed by the first compressor;
A second refrigerant circulation unit configured to circulate the second utilization heat exchanger and the cascade heat exchanger to perform hot water supply of the second refrigerant compressed by the second compressor;
In a heating mode operation or a defrost mode operation of the heat pump interlocking hot water supply device, a first branch which is branched from the first refrigerant circulation part to be connected to the first compressor so that the gas refrigerant of the first refrigerant is injected into the first compressor. A heat pump further includes at least one of a refrigerant injection circuit or a second refrigerant injection circuit branched from the second refrigerant circulation part connected to the second compressor so that the gas refrigerant of the second refrigerant is injected into the second compressor. Peristaltic hot water supply device.

The method of claim 7,
And the first refrigerant injection circuit and the second refrigerant injection circuit are activated when the outside air temperature is lower than or equal to the second predetermined temperature.

The method of claim 7,
A first gas liquid separator and a second gas liquid separator for separating the refrigerant flowing through the first refrigerant injection circuit and the second refrigerant injection circuit into a liquid refrigerant and an air refrigerant are respectively the first refrigerant injection circuit and the second refrigerant injection circuit. Heat pump interlocking hot water supply device disposed in the.

Condensation by the first compressor 105 for compressing the first refrigerant, the first condenser 110 for condensing the first refrigerant compressed by the first compressor 105, and the first condenser 110 A first expansion mechanism 135a for expanding the first refrigerant, a first evaporator 160 for evaporating the first refrigerant expanded by the first expansion mechanism 135a, and again the first compressor 105 A first refrigerant circulating unit configured to circulate the first refrigerant;
A first water circulation unit 150a through which the heating water is circulated so as to perform indoor heating;
The second compressor 125 compresses the second refrigerant, the second condenser 140 condensing the second refrigerant compressed by the second compressor 125, and the second condenser 140 A second expansion mechanism 135b for expanding the second refrigerant, a second evaporator 120 for evaporating the second refrigerant expanded by the second expansion mechanism 135b, and again the second compressor 125 A second refrigerant circulation unit configured to circulate the second refrigerant;
A second water circulation part 150b through which the hot water flows to perform the hot water supply,
The first evaporator 160 is a first use heat exchanger 160 for mutual heat exchange between the first refrigerant and the heating water of the first water circulation unit 150a.
The second condenser 140 is a second use heat exchanger 140 for mutual heat exchange between the second refrigerant and the hot water of the second water circulation part 150b,
The second evaporator 120 is a cascade heat exchanger for exchanging a part of the first refrigerant discharged from the first compressor 105 and the second refrigerant discharged from the second compressor,
An outdoor heat exchanger (110) for evaporating the first refrigerant condensed by the first use heat exchanger (160) and the cascade heat exchanger (120);
The first water circulation unit 150a and the second water circulation unit 150b are connected to each other, and when it is necessary to increase the temperature of the first water circulation unit 150a during operation, the second water circulation unit ( In the heat pump interlocking hot water supply device further comprises a bypass replenishment flow path 300 for replenishing the hot water of 150b) with the heating water of the first water circulation unit (150a),
The first step (S10) for operating the first compressor 105 and the second compressor 125 so that the first refrigerant circulates the first refrigerant circulation section and the second refrigerant circulates the second refrigerant circulation section when power is applied, respectively. ;
After the first step (S10) by comparing the current heating temperature and the target heating temperature compared to the operation rate of the first compressor 105 and the second compressor 125 according to the outside air temperature, the second water circulation unit (150b) The first water circulator 150a and the second water to circulate the hot water and heat exchanged with the second refrigerant to supplement the first water circulation unit 150a with the heating water heat exchanged with the first refrigerant. Control method of the heat pump interlocking hot water supply device comprising a second step (S20) for opening and closing the bypass replenishment flow path (300) connecting the water circulation (150b).

The method of claim 10,
The second step comprises:
The target heating temperature is higher than the current heating temperature, and the heating water heat exchanged with the first refrigerant compressed by the first compressor is lower than the hot water supply heat exchanged with the second refrigerant compressed by the second compressor. Control method of the heat pump interlocking hot water supply device which is the step of opening the bypass supplement flow passage.

The method of claim 10,
The second step comprises:
And opening the bypass replenishment flow path when the first compressor is operated in a defrosting operation mode when the target heating temperature is lower than the current heating temperature.

The method according to claim 11 or 12,
Heating water connecting the first water circulating unit and the second water circulating unit to recover the heating water from the first water circulating unit to the second water circulating unit at the same time as the opening and closing control of the bypass replenishment passage in the second step. And a third step of opening and closing the recovery flow path.

The method according to claim 11 or 12,
The second step is the step of opening the bypass replenishment flow passage only when the second compressor is in operation, the control method of the heat pump interlocking hot water supply apparatus.

The method according to claim 13,
The third step is a step of opening the bypass replenishment flow passage and opening the heating water recovery flow passage only when the second compressor is operating.