WO2022249424A1

WO2022249424A1 - Refrigeration cycle system

Info

Publication number: WO2022249424A1
Application number: PCT/JP2021/020312
Authority: WO
Inventors: 樹彦伊藤
Original assignee: 三菱電機株式会社
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2022-12-01

Abstract

This refrigeration cycle system comprises a plurality of refrigeration cycle devices, and a heat transfer medium system for supplying a heat transfer medium to the plurality of refrigeration cycle devices. The refrigeration cycle device includes: a compressor that compresses a refrigerant; a first heat exchanger that is connected to the compressor and performs heat exchange between the refrigerant and the heat transfer medium; an expansion valve that expands and decompresses the refrigerant subjected to heat exchange in the first heat exchanger; a second heat exchanger that is connected to the expansion valve and performs heat exchange between the refrigerant and air; and a load-side blower for blowing air to the second heat exchanger. A heat source device, a pump, and the first heat exchanger constitute a heat transfer medium circuit connected by heat transfer medium piping. The heat transfer medium system includes: the heat source device, which is connected by the heat transfer medium piping to the first heat exchanger and supplies a heat transfer medium; and the pump, which is provided to the heat transfer medium piping and circulates the heat transfer medium supplied from the heat source device to the first heat exchanger and the heat source device. The refrigeration cycle device includes: a detection device that is provided to the heat transfer medium piping and detects the flow rate of the heat transfer medium flowing into the first heat exchanger through the heat transfer medium piping; and a control device that detects that the flow rate of the heat transfer medium detected by the detection device is lower than or equal to a minimum flow rate of the heat transfer medium required for normal operation of the refrigeration cycle device, and controls at least one among the compressor, the load-side blower, and the expansion valve in accordance with the detection that the flow rate of the heat transfer medium is lower than or equal to the minimum flow rate.

Description

refrigeration cycle system

TECHNICAL FIELD The present disclosure relates to a refrigerating cycle system, and more particularly to a refrigerating cycle system having a plurality of refrigerating cycle devices that detects signs of blockage in heat medium circuits of plate heat exchangers of the plurality of refrigerating cycle devices. .

When air-conditioning an office building, multiple refrigeration cycle devices with plate-type heat exchangers that exchange heat between refrigerant and heat medium are required. When using a plurality of refrigeration cycle devices, the operating time and operating conditions of each refrigeration cycle device differ depending on the environmental conditions and usage conditions of the plurality of indoor spaces to be cooled or heated. Although Patent Document 1 discloses a method for calculating the cleaning timing of the heat exchanger, it does not disclose the relationship with a plurality of refrigeration cycle devices.

JP-A-10-281695

If the heat medium circuit of the plate heat exchanger is blocked by scale or the like, the high pressure and discharge temperature will rise and the operation of the refrigeration cycle device will stop abnormally if the plate heat exchanger is used as a condenser. In addition, when a plate heat exchanger is used as an evaporator, the water freezes and expands in volume, causing a so-called freeze puncture, in which the joint between the plates of the plate heat exchanger bursts. The heat medium may flow into the side, causing uncooling and unwarming due to component failure and refrigerant leakage in the refrigerant circuit.

When using a plurality of refrigerating cycle devices, the operating time and operating conditions of each refrigerating cycle device differ depending on the environmental conditions and usage conditions of the plurality of indoor spaces. It is necessary to detect signs and prevent breakage of plate heat exchangers, failure of parts in refrigerant circuits, and leakage of refrigerant.

The present disclosure has been made in view of the above-mentioned circumstances, and is intended to prevent uncooling and unwarming caused by a heat medium flowing from a heat medium circuit in a plate-type heat exchanger in a plurality of refrigeration cycle devices and a component failure and refrigerant leakage in the refrigerant circuit. An object of the present invention is to provide a refrigeration cycle system capable of preventing

A refrigeration cycle system of the present disclosure includes a plurality of refrigeration cycle devices and a heat medium system that supplies a heat medium to the plurality of refrigeration cycle devices, and the refrigeration cycle device includes a compressor that compresses refrigerant; A first heat exchanger that is connected to a compressor and exchanges heat between the refrigerant and the heat medium; an expansion valve that expands and decompresses the refrigerant heat-exchanged in the first heat exchanger; and the expansion valve. and a second heat exchanger that exchanges heat between the refrigerant and air, and a load side blower that blows air to the second heat exchanger, the heat source device, the pump, and the first heat exchange The heat medium system comprises a heat medium circuit connected by the heat medium pipes, the heat medium system is connected to the first heat exchanger by heat medium pipes, and includes a heat source device that supplies a heat medium, and the heat medium The pump is provided in a pipe and circulates the heat medium supplied from the heat source device to the first heat exchanger and the heat source device, and the refrigeration cycle device is provided in the heat medium pipe, a detection device for detecting the flow rate of the heat medium flowing into the first heat exchanger through the heat medium pipe; and detecting that the flow rate of the heat medium is less than or equal to the minimum flow rate, and in response to detecting that the flow rate of the heat medium is less than or equal to the minimum flow rate, and a control device that controls at least one of

In the refrigeration cycle system of the present disclosure, for each of a plurality of refrigeration cycle devices, at least one of a compressor, a load-side blower, and an expansion valve is controlled when the controller is set to a minimum flow rate at which the refrigeration cycle device can operate normally. to control. Therefore, the refrigerating cycle system of the present disclosure can prevent uncooling and unwarming due to component failure and refrigerant leakage in the refrigerant circuit due to the heat medium flowing from the first heat exchanger to the refrigerant circuit side.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the refrigerating-cycle system which concerns on embodiment. It is a figure which shows the detail of a structure of the refrigerating-cycle apparatus and heat-medium system which are representative in the refrigerating-cycle system which concerns on embodiment. It is a functional block diagram explaining the function of the heat-source equipment side control apparatus in the refrigeration cycle system which concerns on embodiment. It is a flow chart for explaining the operation of the refrigeration cycle system according to the embodiment.

A refrigeration cycle system A according to an embodiment will be described below with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description is given only when necessary. The present disclosure may include any combination of configurations that can be combined among the configurations described in the following embodiments.

In addition, in the following embodiments, a plurality of constituent elements are distinguished from each other by adding an underscore and a number at the end of the code of the constituent element. However, when a plurality of constituent elements are collectively described, or when one of the constituent elements is described as a representative, the description will be made without underscores and numbers.

Embodiment.
FIG. 1 is a diagram showing the configuration of a refrigeration cycle system A according to an embodiment. FIG. 1 illustrates a case where the refrigerating cycle device 100 and the heat medium system 103 are configured in a three-to-one ratio. As shown in FIG. 1 , the refrigerating cycle system A has a refrigerating cycle device 100 — a, a refrigerating cycle device 100 — b, a refrigerating cycle device 100 — c, and a heat medium system 103 .

The number of refrigeration cycle devices 100 may be two or three or more. Further, the refrigerating cycle device 100_a, the refrigerating cycle device 100_b, and the refrigerating cycle device 100_c may all have the same capacity, or may have different capacities.

The refrigeration cycle device 100_a has a plate heat exchanger 13_a. The refrigeration cycle device 100_b has a plate heat exchanger 13_b. A refrigerating cycle device 100_c has a plate heat exchanger 13_c.

The heat medium system 103 has a heat source device 22 and a pump 21 . The heat source device 22, the pump 21, and the plate heat exchangers 13_a to 13_c are connected by heat medium pipes 23 to form a heat medium circuit 20 in which the heat medium circulates. The plate heat exchangers 13 — a to 13 — c are connected in parallel to a common heat source device 22 through heat medium pipes 23 .

The plate heat exchanger 13_a exchanges heat between the refrigerant flowing through the refrigerant circuit (see FIG. 2) and the heat medium flowing through the heat medium circuit 20 in the refrigeration cycle device 100_a. The plate heat exchanger 13_b exchanges heat between the refrigerant flowing through the refrigerant circuit (see FIG. 2) and the heat medium flowing through the heat medium circuit 20 in the refrigeration cycle device 100_b. The plate heat exchanger 13_c exchanges heat between the refrigerant flowing through the refrigerant circuit (see FIG. 2) and the heat medium flowing through the heat medium circuit 20 in the refrigeration cycle device 100_c.

The heat source device 22 is, for example, a cooling tower or a boiler, and cools or heats the heat medium flowing through the heat medium circuit 20 . The heat medium is water, brine, or the like. The pump 21 has a motor driven by, for example, an inverter, and is driven using the motor as a power source to circulate the heat medium in the heat medium circuit 20 .

In the refrigeration cycle system A shown in FIG. 1, the heat medium output from the heat source device 22 to the heat medium pipe 23 is circulated by the pump 21 and flows into the plate heat exchangers 13_a to 13_c. do. The heat medium flowing into the plate heat exchanger 13 — a is heat-exchanged with the refrigerant flowing through the refrigerant circuit of the refrigeration cycle device 100 — a and flows into the heat source device 22 . The heat medium flowing into the plate heat exchanger 13 — b is heat-exchanged with the refrigerant flowing through the refrigerant circuit of the refrigeration cycle device 100 — b, and flows into the heat source device 22 . The heat medium flowing into the plate heat exchanger 13 — c is heat-exchanged with the refrigerant flowing through the refrigerant circuit of the refrigeration cycle device 100 — c and flows into the heat source device 22 .

FIG. 2 is a diagram showing the details of the configurations of the refrigeration cycle device 100 and the heat medium system 103, which are representative of the refrigeration cycle system A according to the embodiment. As shown in FIG. 2 , the refrigeration cycle system A has a refrigeration cycle device 100 and a heat medium system 103 . The refrigeration cycle device 100 has a heat source device 101 and an indoor unit 102 .

FIG. 2 shows a circuit in which the representative refrigeration cycle device 100 and the heat medium system 103 are connected one-to-one in the refrigeration cycle system A according to the embodiment shown in FIG. Moreover, the case where the heat source unit 101 and the indoor unit 102 are configured in a one-to-one manner is illustrated. In the refrigeration cycle device 100, the heat source device 101 and the indoor unit 102 may be integrated. Also, a plurality of indoor units 102 connected to the heat source unit 101 may be connected.

The heat source unit 101 exchanges heat between the refrigerant and the heat medium in the plate heat exchanger 13 and supplies cold heat or hot heat to the indoor unit 102 . The heat source device 101 has a compressor 11 , a four-way valve 12 , a plate heat exchanger 13 and an accumulator 17 .

The heat source machine 101 also has a heat source machine side control device 30 , a flow rate sensor 31 , a first pressure sensor 32 , a second pressure sensor 33 and a notification device 41 .

The compressor 11 has, for example, a compressor motor driven by an inverter, and sucks and compresses the refrigerant. The four-way valve 12 is connected to the compressor 11 and controlled by the heat source device side control device 30 to switch the flow path of the refrigerant between cooling and heating. The four-way valve 12 is an example of a refrigerant channel switching device that switches the flow direction of the refrigerant. The refrigerant flow switching device may be composed of a combination of two-way valves or three-way valves. Further, when the refrigerating cycle device 100 is exclusively used for cooling or heating and there is no need to switch the flow direction of the refrigerant, the refrigerant channel switching device such as the four-way valve 12 may not be provided. The accumulator 17 is a liquid separator that separates the refrigerant liquid that has not completely evaporated in the load-side heat exchanger 15 . Accumulator 17 may not be provided.

The plate heat exchanger 13 is connected between the refrigerant circuit 10 and the heat medium circuit 20 . The plate heat exchanger 13 is a heat exchanger between mediums, and exchanges heat between the refrigerant circulating in the refrigerant circuit 10 and the heat medium circulating in the heat medium circuit 20 .

The indoor unit 102 has an expansion valve 14 , a load-side heat exchanger 15 , a load-side blower 16 and a load-side controller 34 .

The expansion valve 14 is, for example, an electronic expansion valve. The expansion valve 14 is provided between the plate heat exchanger 13 and the load side heat exchanger 15 in the refrigerant circuit 10 . The expansion valve 14 is controlled by a load side controller 34 . The expansion valve 14 adjusts the degree of opening according to, for example, the difference between the indoor temperature and the target temperature to reduce or expand the refrigerant.

The load-side blower 16 blows indoor air to the load-side heat exchanger 15 . The load-side heat exchanger 15 exchanges heat between the refrigerant flowing from the plate-type heat exchanger 13 through the expansion valve 14 or the refrigerant discharged from the compressor 11 and the air blown from the load-side blower 16 . .

A compressor 11, a four-way valve 12, a plate heat exchanger 13, an expansion valve 14, a load-side heat exchanger 15, and an accumulator 17 are connected to the refrigeration cycle device 100 via refrigerant pipes 18, and refrigerant circulates. A refrigerant circuit 10 is formed. That is, the heat source device 101 and the indoor unit 102 are connected by the refrigerant pipe 18 . The refrigerating cycle device 100 may have the heat source device 101 and the indoor unit 102 integrated.

The flow rate sensor 31 is provided on the heat medium pipe 23 connected to the heat medium inlet of the plate heat exchanger 13 . The flow rate sensor 31 detects the flow rate of the heat medium flowing into the plate heat exchanger 13 from the heat medium pipe 23 .

The first pressure sensor 32 is provided in the heat medium pipe 23 connected to the heat medium inlet of the plate heat exchanger 13 . The first pressure sensor 32 detects the inflow pressure of the heat medium flowing into the plate heat exchanger 13 from the heat medium pipe 23 .

The second pressure sensor 33 is provided on the heat medium pipe 23 connected to the heat medium outlet of the plate heat exchanger 13 . The second pressure sensor 33 detects the outflow pressure of the heat medium flowing out from the plate heat exchanger 13 to the heat medium pipe 23 .

The heat source unit side control device 30 receives the flow rate of the heat medium detected by the flow rate sensor 31, the inflow pressure detected by the first pressure sensor 32, and the outflow pressure detected by the second pressure sensor 33. The heat source unit side control device 30 detects signs of clogging of the heat medium circuit of the plate heat exchanger 13 based on the received flow rate, the received inflow pressure, and the received outflow pressure.

In addition, the heat source unit side control device 30 detects whether or not the flow rate of the heat medium flowing into the plate heat exchanger 13 is equal to or less than the minimum flow rate of the heat medium required for normal operation of the refrigeration cycle device 100. do. The heat source unit side control device 30 stops the operation of the compressor 11 when detecting that the flow rate of the heat medium is equal to or less than the minimum flow rate of the heat medium required for the refrigeration cycle device 100 to operate normally. This minimum flow rate is stored in the storage device of the heat source machine side control device 30 .

When the heat source unit side control device 30 detects that the flow rate of the heat medium is equal to or less than the minimum flow rate of the heat medium required for the refrigeration cycle device 100 to operate normally, the abnormality signal is sent to the notification device 41 and the load side control device 41. It is transmitted to the device 34 and the heat medium system side controller 35 .

When the processing circuit of the heat source machine side control device 30 is dedicated hardware, the processing circuit is, for example, a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or any of these A combination is applicable. Each functional unit implemented by the processing circuit may be implemented by separate hardware, or each functional unit may be implemented by one piece of hardware. When the processing circuit of the heat source machine side control device 30 is a CPU, each function executed by the processing circuit is implemented by software, firmware, or a combination of software and firmware. Software and firmware are written as programs and stored in the storage unit. The CPU implements each function of the processing circuit by reading and executing the program stored in the storage unit. A part of the functions of the processing circuit may be realized by dedicated hardware, and a part thereof may be realized by software or firmware.

The load-side control device 34 is connected to the heat source device-side control device 30 by a control communication line 40, and is capable of communicating with the heat source device-side control device 30. The load-side controller 34 controls operations of the expansion valve 14 and the load-side blower 16 . Also, the load-side control device 34 is connected to the remote controller 37 of the indoor unit 102 by wire or wirelessly.

The load side controller 34 outputs control instructions to the expansion valve 14 of the indoor unit 102 and the load side fan 16 based on the target temperature and the fan air volume set by the remote controller 37 . In addition, the load-side control device 34 stops the air blowing operation of the load-side fan 16 when receiving the abnormal signal output from the heat source device-side control device 30 . Further, when receiving the inspection signal output from the heat source unit side control device 30, the load side control device 34 causes the remote controller 37 to display that the heat medium circuit of the plate heat exchanger 13 needs to be inspected and cleaned. .

The notification device 41 is, for example, a monitor and/or a speaker. Based on the inspection signal output from the heat source device side control device 30, the notification device 41 displays and/or outputs by voice that the heat medium circuit of the plate heat exchanger 13 needs to be inspected and cleaned. to notify that inspection and cleaning are required. Further, when the notification device 41 receives the abnormality signal output from the heat source device side control device 30, the notification device 41 displays the abnormality of the heat medium circuit 20 and/or issues an audible notification that the abnormality of the heat medium circuit 20 has occurred. Output by

The heat medium system 103 has a pump 21 , a heat source device 22 and a heat medium system side controller 35 . The heat medium system 103 may be prepared and constructed at the delivery destination of the refrigeration cycle system A. The heat source device 22, the pump 21, and the plate heat exchanger 13 in the heat medium system 103 are connected by a heat medium pipe 23 to form a heat medium circuit 20 in which the heat medium circulates. That is, the refrigeration cycle device 100 and the heat medium system 103 are connected by the heat medium pipe 23 .

The heat medium system control device 35 is connected to the heat source device control device 30 by a control communication line 40 and is capable of communicating with the heat source device control device 30 . The heat medium system controller 35 controls the pressure for circulating the heat medium in the heat medium circuit 20 by the pump 21 . The heat medium system side control device 35 is, for example, the central management device of the delivery destination.

The heat medium system side controller 35 is connected to the heat medium system side notification device 36 . The heat medium system side notification device 36 is, for example, a monitor and/or a speaker in the central monitoring panel of the heat medium system 103 . When the heat medium system side controller 35 receives the inspection signal output from the heat source unit side controller 30, the heat medium system side notification device 36 indicates that the heat medium circuit of the plate heat exchanger 13 should be inspected and cleaned. Show that you need it. When receiving the inspection signal output from the heat source unit side controller 30, the heat medium system side controller 35 outputs by voice that inspection and cleaning of the heat medium circuit of the plate heat exchanger 13 are necessary. You can When the heat medium system side controller 35 receives the abnormality signal output from the heat source unit side controller 30 , the heat medium system side notification device 36 displays the abnormality of the heat medium circuit 20 . When receiving the abnormality signal output from the heat source equipment side control device 30 , the heat medium system side control device 35 may output the fact that the heat medium circuit 20 is abnormal by voice.

FIG. 3 is a functional block diagram illustrating the functions of the heat source equipment side control device 30 in the refrigeration cycle system A according to the embodiment.

As shown in FIG. 3, the heat source unit side control device 30 has a clogging symptom detection section 30_1, an inspection signal output section 30_2, and a minimum flow rate detection section 30_3.

The blockage indication detection unit 30_1 detects the flow rate of the heat medium detected by the flow sensor 31, the inflow pressure of the heat medium detected by the first pressure sensor 32, and the outflow pressure of the heat medium detected by the second pressure sensor 33. to detect signs of blockage in the heat medium circuit of the plate heat exchanger 13 .

The inspection signal output unit 30_2 outputs an inspection signal for the heat medium circuit of the plate heat exchanger 13 to the notification device 41 and the load side control device when a sign of blockage in the heat medium circuit of the plate heat exchanger 13 is detected. 34 and the heat medium system side controller 35 .

The minimum flow rate detection unit 30_3 detects that the flow rate of the heat medium detected by the flow rate sensor 31 is equal to or less than the minimum flow rate of the heat medium required for the refrigeration cycle device 100 to operate normally. The minimum flow rate detection unit 30_3 controls to stop the operation of the compressor 11 in response to detection that the flow rate of the heat medium is equal to or less than the minimum flow rate of the heat medium required for the refrigeration cycle device 100 to operate normally. do In addition, the minimum flow rate detection unit 30_3 detects that the flow rate of the heat medium is equal to or less than the minimum flow rate required for the refrigeration cycle device 100 to operate normally, the load side controller 34, the heat medium system side controller 35 and an anomaly signal to the notification device 41 .

The load-side control device 34 performs control to stop the blowing operation of the load-side fan 16 and control to close the expansion valve 14 in response to receiving the abnormality signal. Note that the minimum flow rate detection unit 30_3 may control at least one of the compressor 11, the expansion valve 14, and the load-side blower 16. In response to the reception of the abnormality signal, the heat medium system side controller 35 displays the abnormality of the heat medium circuit 20 on the heat medium system side notification device 36 and/or sounds that the abnormality of the heat medium circuit 20 has occurred. output by The notification device 41 displays an abnormality in the heat medium circuit 20 and/or outputs by voice that an abnormality has occurred in the heat medium circuit 20 when receiving the abnormality signal output from the heat source device side control device 30. do.

Next, the operation of the refrigeration cycle system A according to the embodiment will be described. FIG. 4 is a flow chart for explaining the operation of the refrigeration cycle system A according to the embodiment.

The heat source unit side control device 30 controls the flow rate of the heat medium flowing into the plate heat exchanger 13, the inflow pressure of the heat medium flowing into the plate heat exchanger 13, and the outflow of the heat medium flowing out of the plate heat exchanger 13. A pressure is received (step S1).

Next, the heat source unit side control device 30 determines whether or not the flow rate of the heat medium flowing into the plate heat exchanger 13 is equal to or less than the minimum flow rate of the heat medium required for normal operation of the refrigeration cycle device 100. It judges (step S2).

In step S2, if the flow rate of the heat medium is not equal to or less than the minimum flow rate (NO in step S2), the heat source unit side control device 30 proceeds to determination in step S4. On the other hand, in step S2, if the flow rate of the heat medium is equal to or less than the minimum flow rate (YES in step S2), the heat source equipment side control device 30 controls the compressor 11, the load side control device 34, the heat medium system side control An abnormal signal is output to the device 35 and the notification device 41 (step S3). The load-side controller 34 controls the expansion valve 14 and the load-side blower 16 . At least one of the compressor 11, the expansion valve 14, and the load-side blower 16 should be controlled.

Specifically, the heat source machine side control device 30 performs control to stop the operation of the compressor 11 . The heat source unit side control device 30 outputs an abnormality signal indicating that the heat medium circuit 20 is abnormal to the notification device 41 , the load side control device 34 and the heat medium system side control device 35 . Thereby, in the refrigerating cycle system A, abnormality signal processing is performed.

When the notification device 41 receives the abnormality signal output from the heat source device side control device 30, the notification device 41 displays the abnormality of the heat medium circuit 20 and/or outputs it by voice. The load-side control device 34 performs control to stop blowing air from the load-side blower 16 and control to close the expansion valve 14 in response to the reception of the abnormality signal. In response to the reception of the abnormality signal, the heat medium system side controller 35 displays the abnormality of the heat medium circuit 20 on the heat medium system side notification device 36 and/or sounds that the abnormality of the heat medium circuit 20 has occurred. output by

Next, based on the flow rate of the heat medium flowing into the plate heat exchanger 13, the inflow pressure of the heat medium, and the outflow pressure of the heat medium flowing out of the plate heat exchanger 13, the heat source unit side control device 30 controls the plate It is determined whether a sign of clogging in the heat medium circuit of the heat exchanger 13 is detected (step S4).

A sign of clogging in the heat medium circuit of the plate heat exchanger 13 is determined by comparing the flow rate of the heat medium detected by the flow rate sensor 31 with the inflow pressure detected by the first pressure sensor 32 and the pressure detected by the second pressure sensor 33. This is done when the pressure difference from the detected outflow pressure is greater than or equal to a predetermined pressure. Here, the "predetermined pressure" means the inflow pressure detected by the first pressure sensor 32 and the second pressure sensor during the test run at the time of delivery of the refrigeration cycle apparatus 100 with no scale deposition on the plate heat exchanger 13. A predetermined pressure greater than the difference from the incoming pressure sensed by 33.

In step S4, if no sign of blockage in the heat medium circuit of the plate heat exchanger 13 is detected (NO in step S4), the process returns to step S1.

In step S4, when a sign of blockage in the heat medium circuit of the plate heat exchanger 13 is detected (YES in step S4), the heat source unit side control device 30 inspects the heat medium circuit of the plate heat exchanger 13. A signal is output to the notification device 41, the load side control device 34, and the heat medium system side notification device 36 (step S5).

When receiving the inspection signal from the heat source unit side control device 30, the notification device 41 displays and/or outputs by voice that the heat medium circuit of the plate heat exchanger 13 needs to be inspected and cleaned, and performs inspection. and notify that cleaning is required. When the load side control device 34 receives the inspection signal from the heat source device side control device 30, it displays on the remote control 37 that the heat medium circuit of the plate heat exchanger 13 needs to be inspected and cleaned. When the heat medium system side notification device 36 receives the inspection signal output from the heat source unit side control device 30, the heat medium system side notification device 36 sends the heat medium system side notification device 36 to the plate heat exchanger 13. Indicates that the heat transfer circuit needs to be inspected and cleaned. Further, when the heat medium system side notification device 36 receives the inspection signal output from the heat source unit side control device 30, the heat medium system side notification device 36 issues a voice message indicating that the heat medium circuit of the plate heat exchanger 13 needs to be inspected and cleaned. You can also output by

In addition, in the refrigeration cycle system A of the present disclosure, failure of the pump 21 and blockage of the strainer are factors other than blockage of the heat medium circuit of the plate heat exchanger 13, and the flow rate of the heat medium may decrease or stop. There is In such a case, the refrigeration cycle system A of the present disclosure needs to be controlled so that the compressor 11 of the heat source device 101 does not operate. The flow rate information detected by the flow rate sensor 31 can be used not only to detect signs of blockage in the heat medium circuit of the plate heat exchanger 13, but also to determine whether the refrigeration cycle apparatus 100 satisfies the minimum required flow rate for normal operation. Used as an interlock function to detect.

The plate heat exchanger 13 in the embodiment is also called a first heat exchanger, the load side heat exchanger 15 is called a second heat exchanger, and the heat source unit side control device 30 is also called a control device. Moreover, the flow rate sensor 31, the first pressure sensor 32, and the second pressure sensor 33 in the embodiment are also referred to as detection devices. Further, the heat source equipment side control device 30, the load side control device 34, and the heat medium system side control device 35 in the embodiment are also referred to as control devices.

Therefore, according to the refrigeration cycle system A according to the embodiment, for each of the plurality of refrigeration cycle devices 100, it is determined whether the flow rate detected by the flow rate sensor 31 is equal to or less than the minimum flow rate at which the refrigeration cycle device 100 can operate normally. . Then, when the detected flow rate is equal to or less than the minimum flow rate, the heat source side control device 30 and the load side control device 34 control at least one of the compressor 11 , the load side fan 16 and the expansion valve 14 . Therefore, the refrigeration cycle system A of the present disclosure can prevent poor cooling and poor heating due to component failure and refrigerant leakage in the refrigerant circuit 10 due to the heat medium flowing from the plate heat exchanger 13 to the refrigerant circuit 10 side. .

Further, according to the refrigeration cycle system A according to the embodiment, the heat source unit side control device 30 can know the timing of inspection and cleaning of the heat medium circuit of the plate heat exchanger 13 for each of the plurality of refrigeration cycle devices 100. can. Therefore, it is possible to prevent uncooling and unwarming due to component failures and refrigerant leaks in the plurality of refrigeration cycle apparatuses 100 .

Furthermore, by stopping the operation of the compressor 11 in the heat source device 101, it is possible to prevent the refrigeration cycle device 100 from malfunctioning. In addition, by stopping the operation of the load-side blower 16 of the indoor unit 102, it is possible to prevent complaints about poor cooling and poor heating when the operation of the refrigeration cycle device 100 is stopped.

The embodiment is presented as an example and is not intended to limit the scope of claims. Embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the gist of the embodiments. These embodiments and modifications thereof are included in the scope and gist of the embodiments.

10 refrigerant circuit, 11 compressor, 12 four-way valve, 13, 13_a, 13_b, 13_c plate heat exchanger, 14 expansion valve, 15 load side heat exchanger, 16 load side blower, 17 accumulator, 18 refrigerant piping, 20 heat medium circuit, 21 pump, 22 heat source device, 23 heat medium pipe, 30 heat source machine side control device, 30_1 clogging indication detection unit, 30_2 inspection signal output unit, 30_3 minimum flow rate detection unit, 31 flow sensor, 32 first pressure sensor, 33 second pressure sensor, 34 load side control device, 35 heat medium system side control device, 36 heat medium system side notification device, 37 remote control, 40 control communication line, 41 notification device, 100, 100_a, 100_b, 100_c refrigeration cycle device , 101 heat source unit, 102 indoor unit, 103 heat medium system, A refrigeration cycle system.

Claims

a plurality of refrigeration cycle devices;
A heat medium system that supplies a heat medium to the plurality of refrigeration cycle devices,
The refrigeration cycle device is
a compressor that compresses a refrigerant;
a first heat exchanger connected to the compressor for exchanging heat between the refrigerant and the heat medium;
an expansion valve that expands and decompresses the refrigerant heat-exchanged in the first heat exchanger;
a second heat exchanger connected to the expansion valve and performing heat exchange between the refrigerant and air;
A load-side blower that blows air to the second heat exchanger,
The heat source device, the pump and the first heat exchanger constitute a heat medium circuit connected by the heat medium pipe,
The heat medium system is
a heat source device connected to the first heat exchanger by a heat medium pipe and supplying a heat medium;
the pump provided in the heat medium pipe and configured to circulate the heat medium supplied from the heat source device to the first heat exchanger and the heat source device;
The refrigeration cycle device is
a detection device provided in the heat medium pipe for detecting the flow rate of the heat medium flowing into the first heat exchanger through the heat medium pipe;
Detecting that the flow rate of the heat medium detected by the detection device is equal to or lower than the minimum flow rate of the heat medium required for normal operation of the refrigeration cycle device, and the flow rate of the heat medium is the minimum flow rate A refrigeration cycle system comprising: a controller that controls at least one of the compressor, the load-side blower, and the expansion valve in response to detection of:
2. The refrigeration cycle system according to claim 1, wherein said detection device comprises a flow rate sensor for detecting a flow rate of said heat medium flowing into said first heat exchanger.
The detection device is
a first pressure sensor that detects an inflow pressure of the heat medium flowing into the first heat exchanger;
a second pressure sensor that detects an outflow pressure of the heat medium flowing out of the first heat exchanger;
The control device is
detecting a sign of blockage in the heat medium circuit based on the heat medium flow rate, the inflow pressure, and the outflow pressure detected by the detection device;
3. The refrigeration cycle system according to claim 1, wherein an inspection signal for said heat medium circuit is output in response to detection of a sign of clogging of said heat medium circuit.
The control device is
The refrigeration cycle according to any one of claims 1 to 3, wherein an abnormality signal indicating that the heat medium circuit is abnormal is output in response to detection that the flow rate of the heat medium is equal to or lower than the minimum flow rate. system.