WO2016088262A1

WO2016088262A1 - Refrigeration cycle apparatus

Info

Publication number: WO2016088262A1
Application number: PCT/JP2014/082295
Authority: WO
Inventors: 拓也伊藤; 和之石田; 靖大越; 昂仁彦根
Original assignee: 三菱電機株式会社
Priority date: 2014-12-05
Filing date: 2014-12-05
Publication date: 2016-06-09
Also published as: JPWO2016088262A1; EP3228951A1; EP3228951B1; JP6410839B2; EP3228951A4

Abstract

The purpose of the present invention is to obtain a refrigeration cycle apparatus which can continue operating even if there is a failure in any of a plurality of refrigerant circuits thereof and which is free of unstableness in the temperature of a medium being cooled when any of the refrigerant circuits are carrying out a defrosting operation while the plurality of refrigerant circuits are carrying out a heating operation. Water-side heat exchanger (8a) and water-side heat exchanger (8c) are connected in series via a water pipe, water-side heat exchanger (8b) and water-side heat exchanger (8d) are connected in series via a water pipe, and water-side heat exchanger (8a) and water-side heat exchanger (8c), which are connected in series with each other, are connected in parallel with water-side heat exchanger (8b) and water-side heat exchanger (8d), which are connected in series with each other, via a water pipe.

Description

Refrigeration cycle equipment

The present invention relates to a refrigeration cycle apparatus.

Conventionally, in a heat exchanger to which a plurality of refrigerant circuits are connected, a technique for preventing water refrigerant from freezing has been proposed. For example, the input temperature and the detection temperature of the cooling medium circulating through the plate heat exchanger and the operating capacity of each refrigeration circuit are input. And the freezing apparatus which prevents the freezing of a water refrigerant | coolant by providing the temperature estimation means which estimates the temperature of the water refrigerant | coolant of the exit side of the flow path of the water rejection medium of each utilization side heat exchanger by calculation is proposed ( For example, see Patent Document 1).

JP 2007-187353 A (Claim 1)

However, in the technique disclosed in Patent Document 1, when a plurality of refrigerant circuits are connected to one plate heat exchanger, if one refrigerant circuit fails, other normal refrigerant circuits cannot be operated. There is a problem.

The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a refrigeration cycle apparatus that can continue operation even if any of a plurality of refrigerant circuits fails. .

A refrigeration cycle apparatus according to the present invention includes a plurality of refrigeration units in which a compressor, a refrigerant flow switching device, an air side heat exchanger, a pressure reducing device, and a heat medium side heat exchanger are sequentially connected via a refrigerant pipe and the refrigerant circulates. A heat medium side heat exchanger, wherein the heat medium side heat exchanger exchanges heat between the heat medium and the refrigerant, and the heat medium side heat exchanger of one or more of the refrigeration cycles is connected to the first heat medium And a second heat medium flow path in which the heat medium side heat exchangers of two or more of the refrigeration cycles are connected in series along the flow of the heat medium, the first heat The medium flow path and the second heat medium flow path are arranged in parallel.

According to the refrigeration cycle apparatus according to the present invention, by connecting a plurality of refrigeration cycles in parallel and in series, the operation of the refrigeration cycle apparatus can be continued even if any refrigeration cycle fails.

1 is a schematic configuration diagram of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. It is a flowchart which shows operation | movement of the heat-source equipment control apparatus at the time of the defrost operation which concerns on Embodiment 1 of this invention. It is a schematic block diagram which shows an example which changed the circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is a schematic block diagram of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention. It is a schematic block diagram of the refrigerating-cycle apparatus which concerns on Embodiment 3 of this invention.

Hereinafter, embodiments of the refrigeration cycle apparatus of the present invention will be described with reference to the drawings. In addition, the form of drawing is an example and does not limit this invention. Moreover, what attached | subjected the same code | symbol in each figure is the same or it corresponds, and this is common in the whole text of a specification. Furthermore, in the following drawings, the relationship between the sizes of the constituent members may be different from the actual one.

Embodiment 1 FIG.
[Configuration of heat source machine 1]
FIG. 1 is a schematic configuration diagram showing an example of a part of the configuration of the refrigeration cycle apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1,

refrigeration cycles

2 a, 2 b, 2 c, 2 d and a heat source unit controller 11 having the same circuit configuration and the same specifications are mounted in a heat source unit 1 that is a part of the refrigeration cycle unit. ing. In addition, what has a plurality of identical devices such as the

refrigeration cycles

2a, 2b, 2c, and 2d may be collectively described as the refrigeration cycle 2.

In the refrigeration cycle 2a, a compressor 3a, a refrigerant flow switching device 4a such as a four-way valve, an air side heat exchanger 5a, a main expansion valve 7a, and a water side heat exchanger 8a are connected in a ring shape through a refrigerant pipe. Yes. An air-side heat exchanger blower 6a is installed in the vicinity of the air-side heat exchanger 5a. The

refrigeration cycles

2b, 2c and 2d have the same configuration as the refrigeration cycle 2a.

The

compressors

3a, 3b, 3c, and 3d suck low-temperature and low-pressure refrigerant and compress the refrigerant into a high-temperature and high-pressure state. Note that a plurality of identical devices such as the

compressors

3 a, 3 b, 3 c, and 3 d may be collectively described as the compressor 3.

The refrigerant

flow switching devices

4a, 4b, 4c and 4d are for switching between the refrigerant flow during the cooling operation and the refrigerant flow during the heating operation. In addition, what has a plurality of identical devices such as the refrigerant

flow switching devices

4a, 4b, 4c, and 4d may be collectively described as the refrigerant flow switching device 4.

The air-

side heat exchangers

5a, 5b, 5c, and 5d function as condensers during the cooling operation, and function as evaporators during the heating operation. For example, the air-side

heat exchanger blowers

6a, 6b, 6c, and 6d such as fans. Heat exchange is performed between the air supplied from the refrigerant and the refrigerant. In addition, about what has the same apparatus etc. exist like air

side heat exchanger

5a, 5b, 5c, and 5d, it may describe collectively like the air side heat exchanger 5. FIG. Similarly, a plurality of identical devices such as air-side

heat exchanger blowers

6a, 6b, 6c and 6d may be collectively described as an air-side heat exchanger blower 6.

The

main expansion valves

7a, 7b, 7c and 7d have a function as a pressure reducing valve or an expansion valve, expand the refrigerant by decompressing it, and can control the opening degree variably, for example, an electronic expansion valve Etc. In addition, what has the same apparatus etc., such as

main expansion valve

7a, 7b, 7c, and 7d, may be described collectively like the main expansion valve 7.

The heat source apparatus control device 11 receives the pressure and temperature of the refrigerant in the refrigeration cycle 2 and the temperature data of water serving as a heat medium from various sensors (not shown), and operates the heat source apparatus 1 and uses the refrigeration cycle apparatus. Based on the operation content instructed by the operator, the compressor 3 is operated and stopped or the rotational speed is controlled, the opening degree of the main expansion valve 7 is controlled, and the rotation control of the air-side heat exchanger blower 6 is performed. Control each actuator.

[Configuration of water pipe 9]
The water-

side heat exchangers

8a, 8b, 8c, and 8d exchange heat between the refrigerant that flows through the refrigeration cycle 2 and water that is a heat medium. The water inlet side of the water side heat exchanger 8a and the water side heat exchanger 8b is connected in parallel by a water pipe 9a. Similarly, the water outlet side of the water side heat exchanger 8c and the water side heat exchanger 8d is connected in parallel by a water pipe 9b. The water outlet side of the water side heat exchanger 8a and the water inlet side of the water side heat exchanger 8c are connected in series by a water pipe 9c. Similarly, the water outlet side of the water side heat exchanger 8b and the water inlet side of the water side heat exchanger 8d are connected in series by a water pipe 9d. The water

side heat exchangers

8a, 8b, 8c and 8d correspond to the “heat medium side heat exchanger” in the present invention. The water pipes 9c and 9d correspond to the “first heat medium flow path” and the “second heat medium flow path” in the present invention, respectively. In addition, a plurality of identical devices such as the water-

side heat exchangers

8a, 8b, 8c, and 8d may be collectively described as the water-side heat exchanger 8.

Next, the flow of water as a heat medium will be described. A cold water pump 10 is installed on the water pipe 9 a outside the heat source device 1. As shown by the dotted arrow in FIG. 1, the cold water pump 10 conveys water, which is a heat medium, passes through the water pipe 9a, and branches into the water side heat exchanger 8a and the water side heat exchanger 8b. The water flowing into the water side heat exchanger 8a passes through the water pipe 9c and flows into the water side heat exchanger 8c. Further, the water that has flowed into the water-side heat exchanger 8b passes through the water pipe 9d and flows into the water-side heat exchanger 8d. Thereafter, the water that has exited the water-side heat exchanger 8c and the water-side heat exchanger 8d merges through the water pipe 9b and is transported outside the heat source unit 1. In addition, in this Embodiment 1, although the cold water pump 10 showed the example installed in the outer side of the heat source apparatus 1, this invention is not limited to this, You may provide in the inside of the heat source apparatus 1. FIG.

[Operation of refrigeration cycle equipment for cooling operation]
The operation of the cooling operation of the refrigeration cycle apparatus will be described. In the refrigeration cycle 2a, the high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 3a flows into the air-side heat exchanger 5a, exchanges heat with the air supplied from the air-side heat exchanger blower 6a, Condensed and liquefied. The high-pressure liquid refrigerant that has exited the air-side heat exchanger 5a is decompressed by the main expansion valve 7a to become a gas-liquid two-phase refrigerant. And while evaporating and gasifying with the water side heat exchanger 8a used as an evaporator, cooling water is produced | generated by absorbing heat from the water which is a heat medium. The low-temperature and low-pressure refrigerant that has exited the water-side heat exchanger 8a is sucked into the compressor 3a.

In addition, although the refrigerating cycle 2a was demonstrated to the example about the operation | movement operation | movement of air_conditionaing | cooling operation, the refrigerating

cycle

2b, 2c, and 2d perform the operation operation of air_conditionaing | cooling operation similar to the refrigerating cycle 2a. This also applies to the defrosting operation and heating operation described later.

[Operation of heating operation of refrigeration cycle equipment]
The operation of heating operation of the refrigeration cycle apparatus will be described. During the heating operation, the refrigerant flow switching device 4a switches between the refrigerant flow during the cooling operation and the refrigerant flow during the heating operation. In the refrigeration cycle 2a, the high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 3a flows into the water-side heat exchanger 8a, performs heat exchange with water as a heat medium, and condenses and liquefies. Accordingly, the temperature of water as the heat medium rises and becomes hot water. The high-pressure liquid refrigerant exiting the water-side heat exchanger 8a is decompressed by the main expansion valve 7a and becomes a gas-liquid two-phase refrigerant. And while evaporating and gasifying with the air side heat exchanger 5a used as an evaporator, it draws heat from the surrounding air and becomes a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant that has left the air-side heat exchanger 5a is sucked into the compressor 3a.

During the heating operation of the refrigeration cycle apparatus, when the humidity in the air becomes high and the heat transfer surface of the air-side heat exchanger 5 becomes less than zero degrees, moisture in the air condenses and freezes on the heat transfer surface, resulting in frost formation. If frost is generated in the air-side heat exchanger 5, the ventilation resistance of the air-side heat exchanger 5 increases, and sufficient performance cannot be exhibited. Therefore, although the defrosting operation | movement which melts the frost attached to the air side heat exchanger 5 is needed, in order to perform a defrosting operation, the heat source for melting a frost is needed.

As a general defrosting method, the refrigerant flow switching device 4 is switched so that the refrigerant flows during the cooling operation, and the compressor 3 is operated. And there exists a method of defrosting the air side heat exchanger 5 using the heat source of the water which passes the water side heat exchanger 8. FIG. Here, if heating operation is performed in a plurality of refrigeration cycles 2, if one or more refrigeration cycles 2 perform a defrosting operation, water heated during the heating operation is cooled, A decrease in the temperature of the heat medium, water, occurs. However, in the first embodiment, it is possible to suppress a decrease in the temperature of water as a heat medium by the following measures.

[Operation of defrosting operation of refrigeration cycle equipment]
The operation of the defrosting operation of the refrigeration cycle apparatus will be described. The difference between the cooling operation and the defrosting operation is that the air-side heat exchanger blower 6a is stopped during the defrosting operation. In the refrigeration cycle 2a, the high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 3a flows into the air-side heat exchanger 5a, exchanges heat with frost formed on the air-side heat exchanger 5a, and condenses. Liquefied. The high-pressure liquid refrigerant exiting the air-side heat exchanger 5a is decompressed by the main expansion valve 7a and becomes a gas-liquid two-phase refrigerant. And while evaporating and gasifying with the water side heat exchanger 8a used as an evaporator, cooling water is produced | generated by absorbing heat from the water which is a heat medium. The low-temperature and low-pressure refrigerant that has exited the water-side heat exchanger 8a is sucked into the compressor 3a.

[Control Operation of Heat Source Unit Control Device 11]
The heat source device 1 according to the first embodiment is equipped with four

refrigeration cycles

2a, 2b, 2c and 2d. For this reason, in order to suppress the fall of the temperature of water, it can control by the heat-source equipment control apparatus 11 so that four

independent refrigeration cycles

2a, 2b, 2c, and 2d may not become a defrosting operation simultaneously. Is possible. On the other hand, the four

refrigeration cycles

2a, 2b, 2c, and 2d are removed at the same time in order to shorten the time during which the temperature of the water that is the heat medium is lowered, rather than to suppress the degree of decrease in the temperature of the water that is the heat medium. Frost operation is also possible. About these controls, it is possible to select which operation is performed by setting a control operation in the heat source apparatus control device 11 in advance.

FIG. 2 is a flowchart showing the operation of the heat source device control device 11 during the defrosting operation according to Embodiment 1 of the present invention. Hereinafter, the control operation of the heat source machine control device 11 will be described based on the steps of FIG. 2 with reference to FIG.

(Step S1)
The heat source machine control device 11 determines whether the four

refrigeration cycles

2a, 2b, 2c, and 2d are set to perform the defrosting operation at the same time. If the four

refrigeration cycles

2a, 2b, 2c, and 2d are set to perform the defrosting operation at the same time, the process proceeds to step S2, and otherwise, the process proceeds to step S4.
(Step S2)
The heat source device control device 11 determines whether at least one of the four

refrigeration cycles

2a, 2b, 2c, and 2d performs a defrosting operation. If at least one performs the defrosting operation, the process proceeds to step S3, and otherwise, the process proceeds to step S1.
(Step S3)
The heat source device control device 11 simultaneously defrosts the four

refrigeration cycles

2a, 2b, 2c and 2d. Thereafter, the process proceeds to step S1.

(Step S4)
The heat source device control device 11 determines whether any one of the four

refrigeration cycles

2a, 2b, 2c, and 2d performs the defrosting operation. If even one defrosting operation is performed, the process proceeds to step S5, and otherwise, the process proceeds to step S1.
(Step S5)
The heat source machine control device 11 determines whether another refrigeration cycle 2 is performing a defrosting operation. If the other refrigeration cycle 2 is not defrosting, the process proceeds to step S6, and otherwise, the process proceeds to step S1.
(Step S6)
The heat source machine control device 11 performs a defrosting operation of the target refrigeration cycle 2. Thereafter, the process proceeds to step S1.

From the above, even if a failure such as freezing puncture occurs due to freezing of water in the water side heat exchanger 8, the water side heat exchanger 8 provided in the refrigeration cycle 2 is independent. The other refrigeration cycles 2 can be operated quickly.

In the conventional technique, when two refrigeration cycles 2 are connected to one water-side heat exchanger 8 and the two refrigeration cycles 2 are in heating operation, the refrigeration cycle 2 on one side is in defrosting operation. If it performs, the water temperature in the water side heat exchanger 8 will fluctuate. For this reason, the driving | running state of the refrigerating cycle 2 which is performing the other heating operation changes, and water temperature becomes unstable. However, the water-side heat exchanger 8 in Embodiment 1 is installed independently for each of the

refrigeration cycles

2a, 2b, 2c, and 2d. For this reason, since the refrigerating cycle 2 which is performing defrosting operation can suppress the influence which it has on the refrigerating cycle 2 which is performing other heating operation, the stable heating operation is attained.

In the first embodiment, an example in which the heat source device 1 includes four refrigeration cycles 2 is shown. However, the present invention is not limited to this, and it is sufficient that three or more refrigeration cycles 2 are provided. The same applies to Embodiments 3 and 4 described later.

FIG. 3 is a schematic configuration diagram showing an example in which the circuit configuration of the refrigeration cycle apparatus according to Embodiment 1 of the present invention is changed. In the refrigeration cycle apparatus according to the first embodiment, the combination of the water pipes 9 can be changed. Hereinafter, the refrigeration cycle apparatus shows an example in which the combination of the water pipes 9 is changed.

[Configuration of water pipe 9]
As shown in FIG. 3, the water inlet side of the water side heat exchanger 8a is connected by a water pipe 9h. The water outlet side of the water side heat exchanger 8a and the water inlet side of the water side heat exchanger 8b are connected in series by a water pipe 9i. The water outlet side of the water side heat exchanger 8b and the water inlet side of the water side heat exchanger 8d are connected in series by a water pipe 9j. The water outlet side of the water side heat exchanger 8d and the water inlet side of the water side heat exchanger 8c are connected in series by a water pipe 9k. And the water exit side of the water side heat exchanger 8c is connected by the water piping 9l. Thus, the water

side heat exchangers

8a, 8b, 8d, and 8c are sequentially connected in series.

Next, the flow of water as a heat medium will be described. The chilled water pump 10 conveys water, which is a heat medium, as shown by a dotted arrow in FIG. 3, passes through the water pipe 9 h, and flows into the water-side heat exchanger 8 a. The water that has flowed out of the water-side heat exchanger 8a passes through the water pipe 9i and flows into the water-side heat exchanger 8b. The water that has flowed out of the water-side heat exchanger 8b passes through the water pipe 9j and flows into the water-side heat exchanger 8d. The water that has flowed out of the water-side heat exchanger 8d passes through the water pipe 9k and flows into the water-side heat exchanger 8c. The water exiting the water-side heat exchanger 8c passes through the water pipe 9l and is conveyed outside the heat source unit 1.

The range of use of the flow rate of the water flowing through the heat source unit 1 is determined by freezing of the water-side heat exchanger 8, performance deterioration, or vibration restrictions due to pulsation. Comparing the heat source unit 1 in the first embodiment and the heat source unit 1 in the third embodiment, the heat source unit 1 in the first embodiment branches water at the water pipe 9a, so the maximum flow rate and the minimum flow rate of water are It becomes larger (see FIG. 1). On the other hand, since the heat source unit 1 in the third embodiment does not branch water through the water pipe 9h, the maximum flow rate and the minimum flow rate of water are small (see FIG. 3).

Since the construction of the refrigerant piping after the installation of the heat source unit 1 involves modification of the high-pressure gas circuit, the amount of work such as refrigerant recovery and other modifications or procedures increases. However, since the water side heat exchanger 8 is installed in each refrigeration cycle 2, for example, the configuration of the water pipe 9 in the heat source unit 1 in the first embodiment and the heat source unit 1 in the third embodiment. The change to the configuration of the water pipe 9 can be made only by changing the rearrangement of the water pipe 9. Thereby, when it is desired to change the maximum flow rate and the minimum flow rate of the water flowing through the water pipe 9, it is possible only by changing the combination of the water pipes 9.

From the above, when changing the maximum flow and the minimum flow through the water pipe 9, the flow range can be easily changed by changing the combination of the water pipes 9 without constructing the refrigerant pipe of the heat source unit 1. It is possible to obtain the heat source device 1 that performs the above.

Embodiment 2. FIG.
FIG. 4 is a schematic configuration diagram of a refrigeration cycle apparatus according to Embodiment 2 of the present invention. Since the basic configuration of the heat source apparatus 1 in the second embodiment is the same as that of the heat source apparatus 1 in the first embodiment, the second embodiment will be described below with a focus on differences from the first embodiment. . The difference between the first embodiment and the second embodiment is that the combination of the water pipes 9 is different.

[Configuration of water pipe 9]
As shown in FIG. 4, the water inlet side of the water side heat exchanger 8a and the water side heat exchanger 8b is connected in parallel by a water pipe 9e. Similarly, the water outlet side of the water side heat exchanger 8c and the water side heat exchanger 8d is connected in parallel by a water pipe 9f. Further, the water outlet side of the water side heat exchanger 8a and the water outlet side of the water side heat exchanger 8b are connected in parallel by a water pipe 9g, and the water outlet side and the water side of the water side heat exchanger 8c are connected. The water outlet side of the heat exchanger 8d is connected in parallel by a water pipe 9g. And the water piping 9g has connected the water side heat exchanger 8a and the water side heat exchanger 8b which were connected in parallel, the water side heat exchanger 8c, and the water side heat exchanger 8d in series. The

water pipes

9e, 9f, and 9g correspond to the “heat medium flow path” in the present invention.

Next, the flow of water as a heat medium will be described. As shown by the dotted arrows in FIG. 4, the chilled water pump 10 conveys water as a heat medium, passes through the water pipe 9e, and branches into the water side heat exchanger 8a and the water side heat exchanger 8b. The water that has flowed into the water-side heat exchanger 8a and the water-side heat exchanger 8b joins through the water pipe 9g. The joined water branches downstream of the water pipe 9g and flows into the water side heat exchanger 8c and the water side heat exchanger 8d. Thereafter, the water that has exited the water-side heat exchanger 8c and the water-side heat exchanger 8d merges through the water pipe 9f and is transported outside the heat source unit 1.

From the above, the water-side heat exchanger 8 in the second embodiment is installed independently for each of the

refrigeration cycles

2a, 2b, 2c, and 2d. For this reason, even if a failure such as freezing puncture occurs due to freezing of water in the water-side heat exchanger 8, the water-side heat exchanger 8 is independent, so that the other refrigeration cycles 2 are emergency. It is possible to drive.

Further, since the refrigeration cycle 2 performing the defrosting operation can suppress the influence on the refrigeration cycle 2 performing the other heating operation, a stable heating operation can be performed.

Furthermore, when the refrigeration cycle 2a or the refrigeration cycle 2b performs the defrosting operation, the water that has flowed out of the refrigeration cycle 2a and the refrigeration cycle 2b is once merged in the water pipe 9g, and therefore, to the refrigeration cycle 2c and the refrigeration cycle 2d. The drop in the temperature of the incoming water is reduced. For this reason, the heating operation in the refrigeration cycle 2c and the refrigeration cycle 2d is stabilized.

In addition, in this Embodiment 2, although the heat source machine 1 showed the example provided with the four refrigeration cycles 2, this invention is not limited to this, The four refrigeration cycles 2 should just be provided.

Embodiment 3 FIG.
FIG. 5 is a schematic configuration diagram of a refrigeration cycle apparatus according to Embodiment 3 of the present invention. Since the basic configuration of the heat source machine 1 in the fourth embodiment is the same as that of the heat source machine 1 in the first embodiment, the second embodiment will be described below with a focus on differences from the first embodiment. . The difference between the first embodiment and the fourth embodiment is that the combination of the water pipes 9 is different and a valve 12 is provided on the water pipe 9.

[Configuration of water pipe 9]
As shown in FIG. 5, the water inlet side of the water side heat exchanger 8a and the water side heat exchanger 8b is connected in parallel by a water pipe 9m. Similarly, the water outlet side of the water side heat exchanger 8c and the water side heat exchanger 8d is connected in parallel by a water pipe 9n. The water outlet side of the water side heat exchanger 8a and the water inlet side of the water side heat exchanger 8c are connected in series by a water pipe 9o. Similarly, the water outlet side of the water side heat exchanger 8b and the water inlet side of the water side heat exchanger 8d are connected in series by a water pipe 9p. Further, the water outlet side of the water side heat exchanger 8a and the water inlet side of the water side heat exchanger 8b are connected in series by a water pipe 9q. The water outlet side of the water side heat exchanger 8d and the water inlet side of the water side heat exchanger 8c are connected in series by a water pipe 9r.

Next, the valve 12 installed on the water pipe 9 will be described. As shown in FIG. 5, the water pipe 9m is provided with a branching portion 13a that branches into the water-side heat exchanger 8a and the water-side heat exchanger 8b. A valve 12a is installed between the branch portion 13a and the refrigerant inlet side of the water-side heat exchanger 8b. Similarly, the water pipe 9n is provided with a branch portion 13b that branches to the water side heat exchanger 8c and the water side heat exchanger 8d. A valve 12b is installed between the branch portion 13b and the refrigerant outlet side of the water side heat exchanger 8d.

Valves

12c, 12d and 12e are installed on the water pipe 9q, the water pipe 9r and the water pipe 9o, respectively. The valve 12 may be an electromagnetic valve that can block the flow of water, or may be a flow rate adjusting valve that can be variably controlled in opening.

The heat source device control device 11 can change the combination of the water pipes 9 through which water flows by switching the valve 12 according to the operation status of the heat source device 1. And the heat-source equipment control apparatus 11 can change the flow range of the water which distribute | circulates the heat-source equipment 1. FIG.

From the above, the heat source device control device 11 can change the flow range of the water flowing through the heat source device 1 by changing the combination of the water pipes 9 through which the water flows by switching the valve 12. Thereby, remodeling work of the water pipe 9 becomes unnecessary, the flow rate of the water flowing through the heat source unit 1 is controlled by controlling the heat source unit control device 11 at the site, transmitting a signal to the valve 12, and operating the valve 12. The range can be changed.

1 heat source machine, 2 refrigeration cycle, 2a to 2d refrigeration cycle, 3 compressor, 3a to 3d compressor, 4 refrigerant flow switching device, 4a to 4d refrigerant flow switching device, 5 air side heat exchanger, 5a to 5d Air side heat exchanger, 6 Air side heat exchanger blower, 6a to 6d Air side heat exchanger blower, 7 Main expansion valve, 7a to 7d main expansion valve, 8 Water side heat exchanger, 8a to 8d Water side heat exchange 9 water pipe, 9a-9r water pipe, 10 cold water pump, 11 heat source machine control device, 12 valve, 12a-12d valve, 13a branch part, 13b branch part.

Claims

A compressor, a refrigerant flow switching device, an air-side heat exchanger, a decompression device, and a heat medium-side heat exchanger are sequentially connected via a refrigerant pipe, and include a plurality of refrigeration cycles in which the refrigerant circulates.
The heat medium side heat exchanger performs heat exchange between the heat medium and the refrigerant,
A first heat medium flow path to which the heat medium side heat exchanger of one or more of the refrigeration cycles is connected;
A second heat medium flow path in which the heat medium side heat exchangers of two or more of the refrigeration cycles are connected in series along the flow of the heat medium,
The refrigeration cycle apparatus in which the first heat medium flow path and the second heat medium flow path are arranged in parallel.
A compressor, a refrigerant flow switching device, an air-side heat exchanger, a decompression device, and a heat medium-side heat exchanger are sequentially connected via a refrigerant pipe, and include a plurality of refrigeration cycles in which the refrigerant circulates.
The heat medium side heat exchanger performs heat exchange between the heat medium and the refrigerant,
A refrigeration cycle apparatus in which two or more sets of heat medium flow paths in which two or more heat medium side heat exchangers are connected in parallel are connected in series.
A heat source device control device for controlling the compressor, the refrigerant flow switching device, the pressure reducing device, and the air-side heat exchanger fan;
The refrigeration cycle apparatus according to claim 1, wherein the heat source device control device selects whether or not to perform a defrosting operation on the refrigeration cycle.
When the defrosting operation of the plurality of refrigeration cycles is possible at the same time when performing the defrosting operation, the heat source device control device performs the defrosting operation of all the refrigeration cycles and simultaneously performs the plurality of refrigeration cycles. The refrigeration cycle apparatus according to claim 3, wherein when the cycle defrost operation is not possible, the defrost operation of the refrigeration cycle to be defrosted is performed.
The refrigeration cycle apparatus according to any one of claims 1, 3, and 4, wherein the first heat medium flow path and the second heat medium flow path can be rearranged.
The refrigeration cycle apparatus according to any one of claims 1 to 5, comprising a plurality of valves for switching the flow of the heat medium.