JP2002318028A - Heat pump type chiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a heat pump type chiller, without deteriorating the capacity and efficiency, even in the individual operation or the simultaneous operation of either one of brine side or tap water side. SOLUTION: A first switching means 3b for switching between the conduction of refrigerant into a hot-water supplying heat exchanger 2 and the bypassing of the same and a second switching means 3c for switching between the conduction of refrigerant into a heat exchanger 4 for brine and the bypassing of the same are provided, whereby a control device 9 controls the first switching means 3b or the second switching means 3c according to a selected operation mode to pass the refrigerant through only the hot-water supplying heat exchanger 2 or the heat exchanger 4 for brine, which is selected by the control device 9. According to this method, the heat exchanger, not necessary for the operation, is bypassed to circulate the refrigerant, whereby a heat loss in the same heat exchanger can be eliminated thereby operating a heat pump chiller, without deteriorating the capacity and efficiency of the same, even in the individual operation or simultaneous operation of either of the brine side or tap water side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat pump chiller having a hot water supply function.

[0002]

2. Description of the Related Art In recent years, radiant cooling and heating such as whole building air conditioning and healthy and highly efficient floor heating have attracted attention from the viewpoint of energy saving and comfort in residential air conditioning. A chiller is required as a heat source device for brine (a heat exchange medium such as antifreeze).
In addition, a heat pump water heater, which is a clean and highly efficient water heater, is also attracting attention. So, to save space,
There is a demand for an outdoor unit that carries one heat source unit and one hot water supply unit for brine.

[0003] In order to supply air conditioning, radiant cooling and heating and hot water supply with one outdoor unit, both brine used for indoor units and radiant cooling and heating and city water (tap water) for hot water supply are cooled and cooled by heat. It needs to be replaced. That is, two systems of fluid (brine and city water) are used for one system of refrigerant, and the operation mode is a heating or cooling operation of only brine, a heating operation of only city water, or a heating and cooling of brine and a city. A mode such as simultaneous operation of water heating is required.

[0004] As a conventional technology satisfying such a function,
JP-A-5-126434 and JP-A-5-22340
The technique disclosed in Japanese Patent Application Publication No. 2 is known.

[0005]

However, Japanese Patent Application Laid-Open No. 5-1 / 1993
In the configuration of Japanese Patent Publication No. 26434, during the heating operation using only city water, and in the configuration of Japanese Patent Application Laid-Open No. 5-223402, during the heating operation using only city water or during the heating or cooling operation using only brine, the fluid that is not required is used. When the refrigerant passes through the heat exchanger as well, heat loss is caused, the efficiency is reduced, and there is a problem that the heating and cooling capacity is reduced. In particular,
Since heat is exchanged between the refrigerant and the brine in the heat exchanger for brine, the heat loss is increased due to better heat conduction as compared with the heat exchange with air.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reduce the capacity and efficiency in either single operation or simultaneous operation of either brine or city water. It is an object of the present invention to provide a heat pump type chiller which operates without any heat.

[0007]

In order to achieve the above object, the present invention employs the following technical means.

According to the first aspect of the present invention, the refrigerant is interposed between the compressor (1) and the four-way valve (3a), and switches between flowing and bypassing the refrigerant to the hot water supply heat exchanger (2). (1) a second switching means (3b, 3d) interposed between the four-way valve (3a) and the expansion valve (5) for switching between flowing refrigerant or bypassing the refrigerant to the brine heat exchanger (4); Switching means (3c, 3e) are provided, and the control means (9) controls the four-way valve (3) in accordance with the selected operation mode.
a) and the first and second switching means (3b to 3e),
The flow of the refrigerant to the hot water supply heat exchanger (2) and the brine heat exchanger (4) is controlled.

As a result, the heat exchanger unnecessary for the operation is bypassed to circulate the refrigerant so that heat loss there is eliminated, and the capacity and efficiency are reduced even in the single operation or simultaneous operation of either brine or city water. It works without letting it go.

According to a second aspect of the present invention, the hot water supply heat exchanger (2) is disposed upstream of the refrigerant flow from the brine heat exchanger (4) and the outdoor heat exchanger (6). I do. As a result, even in the simultaneous operation of brine and city water, the ratio of the gas-phase refrigerant in the heat exchanger for hot water supply can be kept high,
The hot water supply temperature can be increased by increasing the average temperature of the refrigerant.

According to the third aspect of the present invention, the refrigerant which is interposed between the second switching means (3c, 3e) and the brine heat exchanger (4) and is supplied to the brine heat exchanger (4). A four-way valve (3f) for switching the flow direction is provided, and the control means (9) controls the four-way valve (3f) in accordance with the selected operation mode.
f) is controlled.

This is because, in the construction of claim 1 or 2, the flow direction of the refrigerant is reversed between the cooling operation and the heating operation in the brine heat exchanger (4). The flow of the refrigerant and the brine in the vessel (4)
In either operation mode of the cooling operation or the heating operation, the flow becomes a counter flow, and in the other operation mode, it becomes a parallel flow.

As the heat exchanger (2) for hot water supply and the heat exchanger (4) for brine of the present apparatus, a plate heat exchanger or a double tube heat exchanger is used. In such a case, the heat exchange efficiency is improved by using the counter flow as compared with the parallel flow. Therefore, by providing the four-way valve (3f) for switching the flow direction of the refrigerant to be supplied to the brine heat exchanger (4) of the present invention, the refrigerant and the brine can always be in a counterflow in both the cooling operation and the heating operation. It is possible to always perform efficient heat exchange for both cooling and heating.

Incidentally, the reference numerals in parentheses of the above-mentioned means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0015]

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

(First Embodiment) FIG. 1 is a schematic view of a heat pump chiller according to a first embodiment of the present invention. 1
Is a compressor that draws in refrigerant, compresses and discharges the refrigerant, and a discharge side of the compressor 1 is connected to a hot water supply heat exchanger 2 that heats city water (tap water) for hot water supply with compressed high-temperature refrigerant. ing.
Numeral 11 denotes a hot water storage tank for storing city water before heating and hot water after heating, from which cold water is sent to the hot water supply heat exchanger 2 while adjusting the flow rate by the pump 12, and from the high temperature refrigerant in the process of passing therethrough. It absorbs heat and becomes hot water, and returns to hot water storage tank 11.

Downstream of the refrigerant from the hot water supply heat exchanger 2, there is a four-way valve 3a for switching the flow path of the refrigerant therefrom. The four-way valve 3a has a refrigerant and a cooling / heating brine (heat exchange medium such as antifreeze). ) And a heat exchanger for brine 4 for heat exchange with
An expansion valve 5 for reducing the pressure of the high-pressure refrigerant compressed by the compressor 1,
An outdoor heat exchanger 6 for exchanging heat between the refrigerant and the outside air supplied by the blower 6a is connected in a ring shape, and the flow direction of the refrigerant is switched by the preceding four-way valve 3a according to the selection of cooling or heating. Can be

Reference numeral 13 denotes an air-conditioning heat exchanger for cooling and heating the room by exchanging heat between the brine heated or cooled by the brine heat exchanger 4 and the air supplied from the blower 13a. The water is circulated between the brine heat exchanger 4 and the air conditioning heat exchanger 13 while adjusting the flow rate at 14.

The refrigerant that has returned to the four-way valve 3a then flows to the accumulator 7, where excess refrigerant during the heat pump cycle is stored, and the refrigerant is separated into gas and liquid by the gas compressor. 1 and the above circulation is repeated.

The four-way valve 3b constitutes a first switching means,
It is interposed between the compressor 1 and the four-way valve 3a, and switches between circulating or bypassing the refrigerant to the hot water supply heat exchanger 2. The four-way valve 3c forms a second switching means, and the four-way valve 3a
Between the refrigerant and the expansion valve 5 to switch between flowing the refrigerant to the brine heat exchanger 4 and bypassing the refrigerant.

The control device 9 as control means for controlling the operation of the heat pump cycle composed of these components
The operation state of each device described above is determined based on an operation mode selected by a controller of the apparatus (not shown) or a condition set by a user or the like, and information from each sensor (not shown). 3c to output a control signal for controlling others.

Next, the characteristic structure of the present invention will be described.

Hot water supply heat exchanger 2 and brine heat exchanger 4
A first for switching whether to allow the refrigerant to flow or bypass the respective heat exchangers in the respective refrigerant supply paths of
Four-way valves 3b and 3c are provided as second switching means. In the configuration shown in FIG. 1, a four-way valve 3 b is provided upstream of the refrigerant for the hot water supply heat exchanger 2, and a four-way valve 3 c is provided upstream of the refrigerant for the brine heat exchanger 4.

Next, the operation of the above configuration will be described. FIG.
FIG. 3 is a table showing the states of the switching valves 3a to 3c in each operation mode in the configuration shown in FIG. Hereinafter, the operation in each operation mode will be described.

<Simultaneous Operation of Heating and Hot Water Supply> This operation mode is a mode in which a refrigerant is circulated through both the heat exchanger 2 for hot water supply and the heat exchanger 4 for brine to enable heating and hot water supply.

The refrigerant discharged from the compressor 1 is a four-way valve 3b
It passes through (AB) and flows through the hot water supply heat exchanger 2 to exchange heat with city water to heat the city water. Then, the four-way valve 3b (C-
D) → the four-way valve 3a (AB) → the four-way valve 3c (AB), and flows through the brine heat exchanger 4 to exchange heat with the brine to heat the brine.

Thereafter, the refrigerant decompressed by the expansion valve 5 through the four-way valve 3c (CD) flows through the outdoor heat exchanger 6, exchanges heat with the outside air, absorbs heat, and evaporates the liquid-phase refrigerant. . After that, it passes through the four-way valve 3a (DC) and passes through the accumulator 7
And the liquid-phase refrigerant and the gas-phase refrigerant are separated, and only the gas-phase refrigerant is sucked and returns to the compressor 1.

<Simultaneous Cooling / Hot Water Supply Operation> This operation mode is a mode in which the refrigerant flows through both the hot water supply heat exchanger 2 and the brine heat exchanger 4 to enable cooling and hot water supply.

The refrigerant discharged from the compressor 1 is supplied to the four-way valve 3b
It passes through (AB) and flows through the hot water supply heat exchanger 2 to exchange heat with city water to heat the city water. Then, the four-way valve 3b (C-
D)-> through the four-way valve 3a (A-D), circulates through the outdoor heat exchanger 6, exchanges heat with the outside air, radiates heat, and condenses the gas-phase refrigerant.

Thereafter, the refrigerant decompressed by the expansion valve 5 passes through the four-way valve 3c (DC), flows through the brine heat exchanger 4, and exchanges heat with the brine to cool the brine. Thereafter, the refrigerant passes through the four-way valve 3c (BA) → the four-way valve 3a (BC), flows through the accumulator 7, and is separated into the liquid-phase refrigerant and the gas-phase refrigerant. And return.

<Single Heating Operation> In this operation mode, the refrigerant is circulated only to the brine heat exchanger 4 while bypassing the hot water supply heat exchanger 2 to enable heating.

The refrigerant discharged from the compressor 1 is supplied to the four-way valve 3b
Passing through (AD), the hot water supply heat exchanger 2 is bypassed.
Then, through the four-way valve 3a (A-B) → the four-way valve 3c (A-B), the gas flows through the brine heat exchanger 4 to exchange heat with the brine, thereby heating the brine.

Thereafter, the refrigerant decompressed by the expansion valve 5 through the four-way valve 3c (CD) flows through the outdoor heat exchanger 6, exchanges heat with the outside air, absorbs heat, and evaporates the liquid-phase refrigerant. . After that, it passes through the four-way valve 3a (DC) and passes through the accumulator 7
And the liquid-phase refrigerant and the gas-phase refrigerant are separated, and only the gas-phase refrigerant is sucked and returns to the compressor 1.

<Single Cooling Operation> In this operation mode, the refrigerant is circulated only to the brine heat exchanger 4 while bypassing the hot water supply heat exchanger 2 to enable cooling.

The refrigerant discharged from the compressor 1 is supplied to the four-way valve 3b
Passing through (AD), the hot water supply heat exchanger 2 is bypassed.
Then, it passes through the four-way valve 3a (A-D), flows through the outdoor heat exchanger 6, exchanges heat with the outside air, radiates heat, and condenses the gas-phase refrigerant.

Thereafter, the refrigerant decompressed by the expansion valve 5 passes through the four-way valve 3c (DC), flows through the brine heat exchanger 4, and exchanges heat with the brine to cool the brine. Thereafter, the refrigerant passes through the four-way valve 3c (BA) → the four-way valve 3a (BC), flows through the accumulator 7, and is separated into the liquid-phase refrigerant and the gas-phase refrigerant. And return.

<Independent operation of hot water supply> This operation mode is a mode in which the refrigerant is circulated only to the heat exchanger 2 for hot water supply by bypassing the heat exchanger 4 for brine to enable hot water supply.

The refrigerant discharged from the compressor 1 is a four-way valve 3b
It passes through (AB) and flows through the hot water supply heat exchanger 2 to exchange heat with city water to heat the city water. Then, the four-way valve 3b (C-
D) → the four-way valve 3a (AB) → the four-way valve 3c (AD), and the brine heat exchanger 4 is bypassed.

The refrigerant decompressed by the expansion valve 5 flows through the outdoor heat exchanger 6, exchanges heat with the outside air, absorbs heat, and evaporates the liquid-phase refrigerant. Thereafter, the refrigerant passes through the four-way valve 3a (D-C), flows through the accumulator 7, and the liquid-phase refrigerant and the gas-phase refrigerant are separated, and only the gas-phase refrigerant is sucked and returned to the compressor 1.

In each operation mode, the temperature of city water and brine is detected by a temperature sensor (not shown), and the pumps 12 and 14 are controlled by the control device 9 so as to obtain the output of the set temperature.
The flow rate of the compressor and the operating speed of the compressor 1 are adjusted and controlled.

As described above, the control device 9 controls the first and second switching means 3b and 3c in accordance with the selected operation mode, so that the required heat exchanger 2 for hot water supply and the heat exchanger 4 for brine are required. The refrigerant is circulated only to the refrigeration system, and when not needed for operation, it is bypassed and circulated, so there is no heat loss there, and the capacity and efficiency are reduced even in single operation and simultaneous operation of either side of brine and city water Operable without any action.

Further, since the hot water supply heat exchanger 2 is disposed upstream of the flow of the refrigerant from the brine heat exchanger 4 and the outdoor heat exchanger 6, even when the brine and city water are simultaneously operated, the heat exchange for hot water supply is performed. The ratio of the gas-phase refrigerant in the vessel 2 can be kept high, and the hot water supply temperature can be raised by increasing the average temperature of the refrigerant.

(Second Embodiment) FIG. 3 is a schematic view of a heat pump chiller according to a second embodiment of the present invention. The difference from the first embodiment is that a four-way valve is provided in the first embodiment as the first and second switching means, which is a characteristic configuration of the present invention, whereas a three-way valve and a bypass are provided in the present embodiment. The passages are provided in combination, and in each of the refrigerant supply paths of the hot water supply heat exchanger 2 and the brine heat exchanger 4, the refrigerant is switched between flowing and bypassing the respective heat exchangers.

In the configuration shown in FIG. 3, a three-way valve 3d and a bypass passage 15 are provided upstream of the refrigerant for the hot water supply heat exchanger 2, and a three-way valve 3e and a bypass passage 16 are provided upstream of the refrigerant for the brine heat exchanger 4. Provided.

Next, the operation of the above configuration will be described. FIG.
Is a table showing the states of the switching valves 3a, 3d, 3e in each operation mode in the configuration shown in FIG.

<Simultaneous operation of heating and hot water supply> Refrigerant discharged from the compressor 1 passes through the three-way valve 3d (AB), flows through the hot water supply heat exchanger 2, and exchanges heat with city water to remove city water. Heat. Thereafter, the water flows through the heat exchanger 4 for brine and exchanges heat with the brine to heat the brine through the four-way valve 3a (AB) → the three-way valve 3e (AB).

Thereafter, the refrigerant decompressed by the expansion valve 5 flows through the outdoor heat exchanger 6, exchanges heat with the outside air, absorbs heat, and evaporates the liquid-phase refrigerant. Thereafter, the refrigerant passes through the four-way valve 3a (D-C), flows through the accumulator 7, and the liquid-phase refrigerant and the gas-phase refrigerant are separated, and only the gas-phase refrigerant is sucked and returned to the compressor 1.

<Simultaneous operation of cooling and hot water supply> Refrigerant discharged from the compressor 1 passes through the three-way valve 3d (AB), flows through the hot water supply heat exchanger 2, and exchanges heat with city water to remove city water. Heat. Then, it passes through the four-way valve 3a (A-D), flows through the outdoor heat exchanger 6, exchanges heat with the outside air, radiates heat, and condenses the gas-phase refrigerant.

Thereafter, the refrigerant decompressed by the expansion valve 5 flows through the brine heat exchanger 4 to exchange heat with the brine to cool the brine. Thereafter, the refrigerant passes through the three-way valve 3e (BA) → the four-way valve 3a (BC), flows through the accumulator 7, and is separated into the liquid-phase refrigerant and the gas-phase refrigerant. And return.

<Single Heating Operation> The refrigerant discharged from the compressor 1 passes through the bypass passage 15 from the three-way valve 3d (AC) and bypasses the hot water supply heat exchanger 2. And four-way valve 3
a (AB) → Three-way valve 3e (AB), and flows through the brine heat exchanger 4 to exchange heat with the brine to heat the brine.

Thereafter, the refrigerant decompressed by the expansion valve 5 flows through the outdoor heat exchanger 6, exchanges heat with the outside air, absorbs heat, and evaporates the liquid-phase refrigerant. Thereafter, the refrigerant passes through the four-way valve 3a (D-C), flows through the accumulator 7, and the liquid-phase refrigerant and the gas-phase refrigerant are separated, and only the gas-phase refrigerant is sucked and returned to the compressor 1.

<Single Cooling Operation> The refrigerant discharged from the compressor 1 passes through the bypass passage 15 from the three-way valve 3d (AC) and bypasses the hot water supply heat exchanger 2. And four-way valve 3
Through a (AD), the air flows through the outdoor heat exchanger 6, exchanges heat with the outside air, radiates heat, and condenses the gas-phase refrigerant.

Thereafter, the refrigerant decompressed by the expansion valve 5 flows through the brine heat exchanger 4 and exchanges heat with the brine to cool the brine. Thereafter, the refrigerant passes through the three-way valve 3e (BA) → the four-way valve 3a (BC), flows through the accumulator 7, and is separated into the liquid-phase refrigerant and the gas-phase refrigerant. And return.

<Single operation of hot water supply> The refrigerant discharged from the compressor 1 passes through the three-way valve 3d (AB) and passes through the heat exchanger 2 for hot water supply.
And heat exchange with the city water to heat the city water. afterwards,
The four-way valve 3a (AB) → the three-way valve 3e (AC) passes through the bypass passage 16, and the brine heat exchanger 4 is bypassed.

The refrigerant decompressed by the expansion valve 5 flows through the outdoor heat exchanger 6, exchanges heat with the outside air, absorbs heat, and evaporates the liquid-phase refrigerant. Thereafter, the refrigerant passes through the four-way valve 3a (D-C), flows through the accumulator 7, and the liquid-phase refrigerant and the gas-phase refrigerant are separated, and only the gas-phase refrigerant is sucked and returned to the compressor 1.

As described above, also in the configuration of the present embodiment,
The control device 9 controls the first and second modes according to the selected operation mode.
By controlling the switching means 3d, 3e, the refrigerant is circulated only to the required heat exchanger 2 for hot water supply and the heat exchanger 4 for brine, and is circulated by bypass when not required for operation. Eliminates heat loss and enables independent operation or simultaneous operation of either side of brine or city water without reducing the capacity and efficiency.

Further, since the hot water supply heat exchanger 2 is arranged upstream of the flow of the refrigerant from the brine heat exchanger 4 and the outdoor heat exchanger 6, even when the brine and city water are operated simultaneously, the heat exchange for hot water supply is performed. The ratio of the gas-phase refrigerant in the vessel 2 can be kept high, and the hot water supply temperature can be raised by increasing the average temperature of the refrigerant.

(Third Embodiment) FIG. 5 is a schematic view of a heat pump chiller according to a third embodiment of the present invention. The configuration is different from that of the first embodiment in that the flow direction of the refrigerant supplied to the brine heat exchanger 4 is switched between the four-way valve 3c as the second switching means and the brine heat exchanger 4.
The only difference is that f is provided, and the control device 9 controls the four-way valve 3f in the same manner as the other switching valves according to the selected operation mode.

Next, the operation of the above configuration will be described. FIG.
Is the switching valve 3 in each operation mode in the configuration of FIG.
It is the table showing the state of a, 3b, 3c, 3f. The switching valves 3a, 3b, 3c are the same as in the first embodiment, and will not be described. The four-way valve 3f, which is a feature of the present embodiment, is controlled such that the flow of the refrigerant and the flow of the brine in the brine heat exchanger 4 always becomes the counterflow.

Specifically, the pump 14 circulates brine as shown by the arrow in FIG. On the other hand, at the time of the cooling only operation for cooling the brine or the simultaneous operation of cooling and hot water supply, the four-way valve 3f is switched to the dashed line direction (AD, BC) in FIG. During the simultaneous heating and hot water supply operation, the four-way valve 3f is switched in the solid line directions (AB, CD) in FIG.

Thus, in both the cooling operation and the heating operation, the refrigerant and the brine can always be in a counterflow, and the cooling and heating can always be performed with efficient heat exchange.

(Fourth Embodiment) FIG. 7 is a schematic view of a heat pump chiller according to a fourth embodiment of the present invention. The configuration is different from that of the second embodiment in that a four-way valve 3 for switching the flow direction of the refrigerant supplied to the brine heat exchanger 4 is provided between the three-way valve 3 e as the second switching means and the brine heat exchanger 4.
The only difference is that f is provided, and the control device 9 controls the four-way valve 3f in the same manner as the other switching valves according to the selected operation mode.

Next, the operation of the above configuration will be described. FIG.
Is the switching valve 3 in each operation mode in the configuration of FIG.
It is the table showing the state of a, 3d, 3e, 3f. The switching valves 3a, 3d, 3e are the same as in the second embodiment, and will not be described. The four-way valve 3f, which is a feature of the present embodiment, is controlled such that the flows of the refrigerant and the brine in the brine heat exchanger 4 are always countercurrent.

Specifically, the pump 14 circulates brine as shown by the arrow in FIG. On the other hand, at the time of the cooling only operation for cooling the brine or the simultaneous operation of cooling and hot water supply, the four-way valve 3f is switched to the dashed line direction (AD, BC) in FIG. During the simultaneous heating and hot water supply operation, the four-way valve 3f is switched in the solid line directions (AB, CD) in FIG.

As described above, the four-way valve 3f may be added to the refrigerant circuit combining the three-way valve and the bypass passage. Also in this case, the refrigerant and the brine can always be in the opposite flow in both the cooling operation and the heating operation, and the heat exchange can always be performed efficiently in both the cooling and the heating.

(Other Embodiments) In the above embodiment, two fluids of city water and brine are subjected to heat exchange with the refrigerant. However, the present invention is not limited to this, and two fluids of city water and city water, brine and brine are used. May be targeted. The switching means may be provided only on the city water side or only on the brine side depending on the use of the device. Further, although 13 is a heat exchanger for air conditioning, it may be a cold radiation panel or the like for floor heating (cooling).

[Brief description of the drawings]

FIG. 1 is a schematic view of a heat pump chiller according to a first embodiment of the present invention.

FIG. 2 is a table showing the state of each switching valve in each operation mode in the configuration of FIG.

FIG. 3 is a schematic view of a heat pump chiller according to a second embodiment of the present invention.

FIG. 4 is a table showing the state of each switching valve in each operation mode in the configuration of FIG. 3;

FIG. 5 is a schematic view of a heat pump chiller according to a third embodiment of the present invention.

FIG. 6 is a table showing the state of each switching valve in each operation mode in the configuration of FIG. 5;

FIG. 7 is a schematic diagram of a heat pump chiller according to a fourth embodiment of the present invention.

FIG. 8 is a table showing the state of each switching valve in each operation mode in the configuration of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Hot water supply heat exchanger 3a, 3f Four-way valve 3b, 3c Four-way valve (switching means) 3d, 3e Three-way valve (switching means) 4 Brine heat exchanger 5 Expansion valve 6 Outdoor heat exchanger 7 Accumulator 9 Control Device (control means)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L060 AA05 CC19 DD07 EE09 EE33 EE44 3L092 AA01 AA02 BA05 BA26 DA19 FA22

Claims (3)

[Claims] 1. A compressor (1) for sucking, compressing and discharging a refrigerant, a four-way valve (3a) for switching a flow path of the refrigerant from the compressor (1) in accordance with selection between cooling and heating, A heat exchanger for brine for exchanging heat with the cooling and heating brine, an expansion valve for decompressing the high-pressure refrigerant compressed by the compressor, and outdoor heat for exchanging heat between the refrigerant and outside air. A heat pump cycle in which an exchanger (6) and an accumulator (7) for storing surplus refrigerant in the refrigeration cycle and for sucking gas refrigerant into the compressor (1) are connected in a ring shape; A hot-water supply heat exchanger (2) provided between the valve (3a) and the high-temperature refrigerant compressed by the compressor (1), and control means (9) for controlling the operation of the refrigeration cycle. ) And a heat pump chiller And first switching means (3b, interposed between the compressor (1) and the four-way valve (3a), for switching whether to flow or bypass the refrigerant to the hot water supply heat exchanger (2). 3
d) and a second switching means (interposed between the four-way valve (3a) and the expansion valve (5), for switching whether to flow or bypass the refrigerant to the brine heat exchanger (4). 3c, 3e), and the control means (9) controls the four-way valve (3a) and the first and second switching means (3b to 3e) according to the selected operation mode, and Pump-type chiller, which controls the flow of refrigerant to the heat exchanger for water (2) and the heat exchanger for brine (4). 2. The heat exchanger for hot-water supply according to claim 2, wherein the heat exchanger for hot-water supply is disposed upstream of the flow of refrigerant from the heat exchanger for brine and the outdoor heat exchanger. 1
4. The heat pump chiller according to 1. 3. A flow direction of a refrigerant interposed between the second switching means (3c, 3e) and the brine heat exchanger (4) and supplied to the brine heat exchanger (4). A four-way valve (3f) for switching is provided, and the control means (9) comprises:
The heat pump chiller according to claim 1 or 2, wherein the four-way valve (3f) is controlled according to the selected operation mode.