JP2020125885A - Refrigeration cycle device - Google Patents

Abstract

To provide a refrigeration cycle device that can detect an abnormality of a throttle mechanism whose opening degree is fixed.SOLUTION: A refrigeration cycle device according to the present invention comprises: a throttle mechanism whose opening degree is fixed; a utilization side heat exchanger for functioning as an evaporator, and through which a refrigerant depressurized by the throttle mechanism flows, and a reporting unit for reporting an abnormality. When temperature efficiency of the utilization side heat exchanger becomes larger than a reference value, an abnormality of the throttle mechanism is reported by the reporting unit.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a refrigeration cycle apparatus that determines an abnormality of a throttle mechanism.

The refrigeration cycle device includes a refrigeration cycle circuit including a compressor, a condenser, a throttle mechanism, and an evaporator. Further, as a conventional refrigeration cycle apparatus, a refrigeration cycle apparatus capable of detecting an abnormality of a throttle mechanism has also been proposed (see Patent Document 1). Specifically, Patent Document 1 discloses a refrigerating apparatus which is an example of a refrigerating cycle apparatus. The refrigeration apparatus described in Patent Document 1 uses an electronic expansion valve whose opening degree is variable as a throttle mechanism. Then, the refrigeration apparatus described in Patent Document 1 is operated with the opening of the electronic expansion valve fully closed, and the pressure on the low pressure side of the refrigeration cycle circuit at that time is compared with a reference value to perform electronic expansion. It is determined whether the valve is abnormal.

JP-A-2-282673

Some refrigeration cycle devices used as air conditioners or refrigeration devices for vehicles employ a throttle mechanism with a fixed opening such as a capillary. Here, as described above, the conventional method for detecting an abnormality in the throttle mechanism in the refrigeration cycle apparatus needs to change the opening degree of the throttle mechanism when determining whether the throttle mechanism is abnormal. Therefore, the conventional abnormality detection method of the throttle mechanism cannot be adopted for the refrigeration cycle apparatus using the throttle mechanism with a fixed opening. Therefore, the conventional refrigeration cycle apparatus using the throttle mechanism with a fixed opening degree has a problem that it cannot detect an abnormality of the throttle mechanism.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a refrigeration cycle apparatus capable of detecting an abnormality in a throttle mechanism having a fixed opening.

The refrigeration cycle apparatus according to the present invention includes a throttle mechanism having a fixed opening degree, a utilization side heat exchanger that functions as an evaporator, in which a refrigerant decompressed by the throttle mechanism flows, and a notification unit that reports an abnormality. When the temperature efficiency of the usage-side heat exchanger is higher than a reference value, the notification unit is configured to notify the abnormality of the throttle mechanism.

When the throttle mechanism with a fixed opening degree is clogged with foreign matter, for example, and the flow path of the throttle mechanism is blocked, the temperature efficiency of the utilization side heat exchanger that functions as an evaporator increases. The refrigeration cycle apparatus according to the present invention utilizes this phenomenon to determine whether or not the throttling mechanism is abnormal. Therefore, the refrigeration cycle apparatus according to the present invention can detect an abnormality in the throttle mechanism having a fixed opening.

It is a figure which shows the structure of the refrigerating-cycle apparatus which concerns on embodiment of this invention. It is a figure which shows the flow of the refrigerant|coolant in the utilization side heat exchanger of the refrigerating-cycle apparatus which concerns on embodiment of this invention. In the refrigerating cycle device concerning an embodiment of the invention, it is a graph which shows temperature change of a refrigerant when throttle mechanism 23 is normal. In the refrigerating cycle device concerning an embodiment of the invention, it is a graph which shows temperature change of a refrigerant when throttle mechanism 23 is abnormal. It is a flowchart which shows the example of the flow of abnormality determination processing of the throttling mechanism performed with the control apparatus of the refrigerating cycle device which concerns on embodiment of this invention.

In the following embodiments, an example of the refrigeration cycle device according to the present invention will be described. In addition, in the following embodiments, an example of using the refrigeration cycle apparatus according to the present invention as an air conditioner performing a cooling operation will be described as an example of the refrigeration cycle apparatus according to the present invention.

Embodiment.
FIG. 1 is a diagram showing a configuration of a refrigeration cycle device according to an embodiment of the present invention.
The refrigeration cycle apparatus 100 includes a refrigeration cycle circuit 10 that circulates a refrigerant, and a control device 3 that controls the entire refrigeration cycle apparatus 100 including the refrigeration cycle circuit 10.

The refrigeration cycle circuit 10 has a configuration in which a compressor 11, a heat source side heat exchanger 12, a throttle mechanism 23, and a use side heat exchanger 21 are annularly connected via a refrigerant pipe. In addition, as described above, the refrigeration cycle device 100 according to the present embodiment is used as an air conditioner that performs a cooling operation. In this case, the heat source side heat exchanger 12 becomes an outdoor heat exchanger, and the use side heat exchanger 21 becomes an indoor heat exchanger.

[Heat source machine]
The refrigeration cycle device 100 has a heat source device 1. The heat source machine 1 accommodates the compressor 11 and the heat source side heat exchanger 12 described above. Further, the heat source device 1 accommodates a heat source side fan 13 and a pressure sensor 14. In addition, as described above, the refrigeration cycle device 100 according to the present embodiment is used as an air conditioner that performs a cooling operation. In this case, the heat source device 1 is an outdoor unit installed outdoors.

The compressor 11 is a fluid machine that draws in low-pressure gas refrigerant, compresses it, and discharges it as high-pressure gas refrigerant. When the compressor 11 operates, the refrigerant circulates in the refrigeration cycle circuit 10. As the compressor 11, for example, an inverter-driven compressor whose rotation speed can be adjusted is used. The heat source side heat exchanger 12 is a heat exchanger that functions as a condenser. In the heat source side heat exchanger 12, heat exchange between the refrigerant and the outdoor air is performed.

The heat source side fan 13 supplies outdoor air to the heat source side heat exchanger 12. When the heat source side fan 13 operates, the outdoor air is sucked into the heat source unit 1, and the outdoor air passing through the heat source side heat exchanger 12 is discharged to the outside of the heat source unit 1. In this embodiment, a propeller fan driven by a motor is used as the heat source side fan 13.

The pressure sensor 14 is provided in the refrigerant pipe between the utilization side heat exchanger 21 and the compressor 11 in the refrigeration cycle circuit 10, that is, the refrigerant pipe on the suction side of the compressor 11. The pressure sensor 14 detects the pressure on the low pressure side of the refrigeration cycle circuit 10 and outputs a detection signal to the control device 3 described later. In the control device 3, the evaporation temperature Te of the refrigerant flowing through the utilization side heat exchanger 21 is calculated based on the pressure on the low pressure side of the refrigeration cycle circuit 10. Instead of the pressure sensor 14, a temperature sensor may be provided at a position where the gas-liquid two-phase refrigerant flows in the use side heat exchanger 21. Thereby, the evaporation temperature Te can be detected by the temperature sensor.

[Use machine]
The usage machine 2 accommodates the usage-side heat exchanger 21 and the throttling mechanism 23 described above. In addition, the usage machine 2 accommodates a usage-side fan 22, a temperature sensor 24, and a temperature sensor 25. In addition, as described above, the refrigeration cycle device 100 according to the present embodiment is used as an air conditioner that performs a cooling operation. In this case, the user machine 2 is an indoor unit installed indoors.

The utilization side heat exchanger 21 is a heat exchanger that functions as an evaporator. In the use side heat exchanger 21, heat exchange between the refrigerant and room air is performed. The diaphragm mechanism 23 is a diaphragm mechanism whose opening is fixed. In the present embodiment, a capillary is used as the diaphragm mechanism 23.

The usage-side fan 22 supplies air to the usage-side heat exchanger 21. When the usage-side fan 22 operates, the indoor air is sucked into the usage machine 2, and the conditioned air that has passed through the usage-side heat exchanger 21 is supplied to the room. In the present embodiment, a centrifugal fan or a cross flow fan driven by a motor is used as the use side fan 22.

The temperature sensor 24 is provided on the upstream side of the use side heat exchanger 21 in the air flow. In other words, the temperature sensor 24 detects the temperature of the air supplied to the usage-side heat exchanger 21. That is, the temperature sensor 24 detects the temperature of the air in the room to which the conditioned air from the user machine 2 is supplied. Specifically, the temperature sensor 24 detects the room temperature Teai, which is the temperature of the air in the room, and outputs a detection signal to the control device 3. The temperature sensor 25 is provided in the refrigerant pipe between the utilization side heat exchanger 21 and the compressor 11 in the refrigeration cycle circuit 10, that is, the refrigerant pipe on the outlet side of the utilization side heat exchanger 21. The temperature sensor 25 detects the refrigerant temperature Teo, which is the temperature of the refrigerant at the outlet of the usage-side heat exchanger 21, and outputs a detection signal to the control device 3.

[Control device]
The control device 3 includes a compressor 11, a heat source side fan 13, and a use side fan 22 based on detection signals from various sensors provided in the refrigeration cycle circuit 10, operation signals from an operation unit (not shown), and the like. The operation of the entire refrigeration cycle apparatus 100 is controlled. The control device 3 includes a dedicated hardware or a CPU (Central Processing Unit) that executes a program stored in a memory. Note that the CPU is also referred to as a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a processor.

When the control device 3 is dedicated hardware, the control device 3 is, for example, a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Applicable Each of the functional units realized by the control device 3 may be realized by individual hardware, or each functional unit may be realized by one piece of hardware.

When the control device 3 is a CPU, each function executed by the control device 3 is realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in the memory. The CPU realizes each function of the control device 3 by reading and executing the program stored in the memory. Here, the memory is a nonvolatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, or an EEPROM.

Note that part of the functions of the control device 3 may be realized by dedicated hardware, and part of the functions may be realized by software or firmware. The control device 3 may be provided in the heat source device 1 or the user device 2. Further, the control device 3 may include a heat source device control unit provided in the heat source device 1 and a user device control unit provided in the user device 2 and capable of communicating with the heat source device control unit.

The control device 3 stores data representing the evaporation temperature Te, data representing the refrigerant temperature Teo, and data representing the indoor temperature Teai, and determines the temperature efficiency from these stored data to determine the abnormality of the throttle mechanism 23. It is configured. Further, when the control device 3 determines that the diaphragm mechanism 23 is abnormal, the control device 3 is configured to notify the abnormality of the diaphragm mechanism 23 to the outside by displaying an abnormality code on the notification unit. In order to realize these configurations, the control device 3 includes a storage unit 31, an acquisition unit 32, a calculation unit 33, a comparison unit 34, a determination unit 35, and a notification unit 36 as functional units.

The storage unit 31 is configured to store pressure data detected by the pressure sensor 14 as data representing the evaporation temperature Te of the refrigerant flowing through the use side heat exchanger 21. As described above, the data representing the evaporation temperature Te is not limited to the data of the evaporation temperature Te itself, and may be the data having a correspondence relationship with the evaporation temperature Te. If the storage unit 31 stores the conversion data indicating the relationship between the pressure detected by the pressure sensor 14 and the evaporation temperature Te, the evaporation temperature Te is calculated from the conversion data and the pressure data detected by the pressure sensor 14. be able to. The calculation of the evaporation temperature Te may be performed by the storage unit 31, for example. In this case, the storage unit 31 may store the calculated evaporation temperature Te as data representing the evaporation temperature Te. Further, for example, the calculation of the evaporation temperature Te may be performed by the acquisition unit 32.

Further, the storage unit 31 is configured to store the data of the temperature detected by the temperature sensor 25 as the data representing the refrigerant temperature Teo which is the temperature of the refrigerant at the outlet of the utilization side heat exchanger 21. Note that the storage unit 31 may store, as the data representing the refrigerant temperature Teo, data having a corresponding relationship with the refrigerant temperature Teo. In this case, if the storage unit 31 stores the conversion data indicating the relationship between the data and the refrigerant temperature Teo, the refrigerant temperature Teo can be calculated based on the conversion data.

In addition, the storage unit 31 is configured to store the temperature data detected by the temperature sensor 24 as the data indicating the indoor temperature Teai, which is the temperature of the indoor air to which the conditioned air from the user device 2 is supplied. There is. Note that the storage unit 31 may store, as the data representing the indoor temperature Teai, data having a correspondence relationship with the indoor temperature Teai. In this case, if the storage unit 31 stores the conversion data indicating the relationship between the data and the room temperature Teai, the room temperature Teai can be calculated based on the conversion data.

The pressure data detected by the pressure sensor 14, the temperature data detected by the temperature sensor 25, and the temperature data detected by the temperature sensor 24 are periodically acquired and stored in the storage unit 31.

The acquisition unit 32 is configured to acquire the data of the evaporation temperature Te, the refrigerant temperature Teo, and the indoor temperature Teai, which are necessary for the abnormality determination of the throttling mechanism 23, from the data stored in the storage unit 31 by extraction or calculation. ing.

The calculation unit 33 is configured to calculate the temperature efficiency ηc of the usage-side heat exchanger 21, using the data acquired by the acquisition unit 32. The temperature efficiency ηc of the use-side heat exchanger 21 is calculated by the following equation (1) using the evaporation temperature Te [°C], the refrigerant temperature Teo [°C], and the indoor temperature Teai [°C].
ηc=(Teo-Te)/(Teai-Te) (1)

The comparison unit 34 is configured to compare the temperature efficiency ηc calculated by the calculation unit 33 with the reference value η0 stored in the storage unit 31 as a threshold value of the temperature efficiency ηc.

The determination unit 35 is configured to determine whether the diaphragm mechanism 23 is normal or abnormal based on the comparison result of the comparison unit 34.

The notification unit 36 is configured to notify various information such as an abnormality of the diaphragm mechanism 23. The notification unit 36 includes at least one of a display unit that visually notifies information and a voice output unit that auditorily notifies information. When the determination unit 35 determines that the diaphragm mechanism 23 is abnormal, the notification unit 36 notifies the user of the abnormality of the diaphragm mechanism 23 by displaying an abnormality code on the display unit of the notification unit 36.

[Operation of refrigeration cycle circuit]
Next, the operation of the refrigeration cycle circuit 10 during the cooling operation will be described.
The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the heat source side heat exchanger 12 that functions as a condenser. The gas refrigerant flowing into the heat source side heat exchanger 12 is condensed by heat exchange with the outdoor air supplied by the heat source side fan 13, and becomes a high pressure liquid refrigerant. The liquid refrigerant condensed in the heat source side heat exchanger 12 is decompressed by the expansion mechanism 23 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant whose pressure has been reduced by the expansion mechanism 23 flows into the usage-side heat exchanger 21 that functions as an evaporator. The gas-liquid two-phase refrigerant that has flowed into the usage-side heat exchanger 21 evaporates due to heat exchange with the indoor air supplied by the usage-side fan 22, and becomes a low-pressure gas refrigerant. The room air that has passed through the use-side heat exchanger 21 becomes cooled conditioned air and is supplied to the room. The gas refrigerant evaporated in the usage-side heat exchanger 21 is sucked into the compressor 11 and compressed into a high-temperature and high-pressure gas refrigerant.

FIG. 2 is a diagram showing the flow of the refrigerant in the utilization side heat exchanger of the refrigeration cycle device according to the embodiment of the present invention. FIG. 3 is a graph showing the temperature change of the refrigerant when the throttle mechanism is normal in the refrigeration cycle device according to the embodiment of the present invention. FIG. 4 is a graph showing a temperature change of the refrigerant when the throttle mechanism is abnormal in the refrigeration cycle device according to the embodiment of the present invention. The horizontal axis direction in FIGS. 3 and 4 represents the position in the refrigerant flow path in the use-side heat exchanger 21. Specifically, in FIGS. 3 and 4, the left end represents the refrigerant inlet of the utilization side heat exchanger 21, and the right end represents the refrigerant outlet of the utilization side heat exchanger 21. Further, the vertical axis direction in FIGS. 3 and 4 represents the temperature. The white arrow shown in FIG. 2 represents the flow of air supplied to the usage-side heat exchanger 21. The hatched arrows shown in FIGS. 2, 3 and 4 indicate the flow direction of the refrigerant. Further, FIG. 4 also shows the temperature change of the refrigerant when the throttle mechanism 23 is normal.

[When the diaphragm mechanism is normal]
First, with reference to FIG. 2 and FIG. 3, the temperature change of the refrigerant when the throttle mechanism 23 is normal will be described. Here, the room temperature Teai, which is the temperature of the air in the room to which the conditioned air from the user machine 2 is supplied, is detected by the temperature sensor 24. The refrigerant temperature Teo, which is the temperature of the refrigerant at the outlet of the usage-side heat exchanger 21, is detected by the temperature sensor 25. The evaporation temperature Te of the refrigerant flowing through the use side heat exchanger 21 is calculated using the pressure on the low pressure side of the refrigeration cycle circuit 10 detected by the pressure sensor 14.

The gas-liquid two-phase refrigerant, which has been reduced in pressure by the expansion mechanism 23 to have a low temperature and low pressure, flows into the use side heat exchanger 21. The gas-liquid two-phase refrigerant that has flowed into the usage-side heat exchanger 21 evaporates due to heat exchange with the room air of the temperature Teai supplied by the usage-side fan 22, and changes into a gas refrigerant. Inside the utilization side heat exchanger 21, the temperature of the refrigerant changes as shown by line A in FIG. Specifically, when the state of the refrigerant is the gas-liquid two-phase state, the temperature of the refrigerant becomes the evaporation temperature Te. When the gas-liquid two-phase refrigerant evaporates and becomes a gas refrigerant, the temperature of the gas refrigerant rises as much as it absorbs heat from the indoor air. Therefore, the refrigerant temperature Teo, which is the temperature of the refrigerant at the outlet of the usage-side heat exchanger 21, is closer to the indoor temperature Teai than the evaporation temperature Te.

[When the diaphragm mechanism is abnormal]
Next, the temperature change of the refrigerant when the throttle mechanism 23 is abnormal will be described with reference to FIGS. 2 and 4. When the flow path of the expansion mechanism 23 is blocked due to, for example, foreign matter clogging the expansion mechanism 23, it becomes difficult for the refrigerant to flow from the expansion mechanism 23 into the usage-side heat exchanger 21. As a result, the flow rate of the refrigerant flowing through the usage-side heat exchanger 21 decreases. Therefore, when the flow path of the throttling mechanism 23 is blocked, the gas-liquid two-phase refrigerant evaporates in the usage-side heat exchanger 21 on the upstream side in the refrigerant flow direction as compared with when the throttling mechanism 23 is normal. Becomes a gas refrigerant. That is, when the flow path of the throttling mechanism 23 is closed, the temperature of the refrigerant in the utilization side heat exchanger 21 starts to rise on the upstream side in the refrigerant flow direction as compared with when the throttling mechanism 23 is normal. Therefore, when the flow path of the expansion mechanism 23 is blocked, the refrigerant temperature Teo, which is the temperature of the refrigerant at the outlet of the usage-side heat exchanger 21, becomes higher than when the expansion mechanism 23 is normal. That is, as can be seen from the above formula (1), when the flow path of the diaphragm mechanism 23 is blocked, the temperature efficiency ηc becomes larger than when the diaphragm mechanism 23 is normal.

Therefore, in the refrigeration cycle apparatus 100 according to the present embodiment, when the temperature efficiency ηc of the usage-side heat exchanger 21 becomes larger than the reference value η0, it is determined that the throttle mechanism 23 is abnormal. The temperature efficiency ηc of the usage-side heat exchanger 21 is an index representing the heat transfer performance of the usage-side heat exchanger 21, and is usually the model of the refrigeration cycle device 100 or the usage machine 2, the rotation speed of the usage-side fan 22, and the like. Determined by Therefore, if the throttle mechanism 23 is normal, the temperature efficiency ηc is not affected by the fluctuations of the refrigerant temperature Teo and the indoor temperature Teai, which are the temperatures of the refrigerant at the outlet of the usage-side heat exchanger 21. Therefore, the abnormality of the diaphragm mechanism 23 can be accurately determined by determining the abnormality of the diaphragm mechanism 23 based on the temperature efficiency ηc.

[Flow of error judgment]
FIG. 5 is a flowchart showing an example of the flow of an abnormality determination process for the throttle mechanism, which is executed by the control device for the refrigeration cycle device according to the embodiment of the present invention. The abnormality determination process of the diaphragm mechanism 23 shown in FIG. 5 is repeatedly executed at predetermined time intervals, for example.

When the abnormality determination process of the throttle mechanism 23 is started, the acquisition unit 32 of the control device 3 in step S1 uses the data stored in the storage unit 31 to determine the refrigerant temperature Teo and evaporation required for the abnormality determination of the throttle mechanism 23. The data of the temperature Te and the room temperature Teai are acquired by extraction or calculation. In step S2 after step S1, the calculation unit 33 of the control device 3 calculates the temperature efficiency ηc of the usage-side heat exchanger 21 from the data acquired in step S1.

After step S2, in step S3, the comparison unit 34 of the control device 3 compares the temperature efficiency ηc of the utilization side heat exchanger 21 with the reference value η0. The reference value η0 is a value determined based on the model of the refrigeration cycle device 100 or the user machine 2, the rotation speed of the user side fan 22, and the like.

When the temperature efficiency ηc of the use side heat exchanger 21 is larger than the reference value η0, the determination unit 35 of the control device 3 proceeds to step S4 and determines that the throttle mechanism 23 is abnormal. Then, in step S5 after step S4, the notification unit 36 of the control device 3 notifies that the diaphragm mechanism 23 is abnormal. Then, when the process of step S5 for notifying the abnormality of the diaphragm mechanism 23 ends, the control device 3 ends the abnormality determination process of the diaphragm mechanism 23.

On the other hand, when the temperature efficiency ηc of the utilization side heat exchanger 21 is equal to or less than the reference value η0, the determination unit 35 of the control device 3 proceeds to step S6 and determines that the throttle mechanism 23 is normal. After that, the control device 3 ends the abnormality determination process of the diaphragm mechanism 23.

As described above, the refrigeration cycle apparatus 100 according to the present embodiment has a restriction mechanism 23 with a fixed opening degree, a use-side heat exchanger 21 that functions as an evaporator and in which a refrigerant decompressed by the restriction mechanism 23 flows, and an abnormality. The notification unit 36 for notifying is provided, and when the temperature efficiency of the usage-side heat exchanger 21 becomes larger than the reference value, the abnormality of the throttle mechanism 23 is notified by the notification unit 36.

When the throttle mechanism 23 having a fixed opening degree is clogged with foreign matter, for example, and the flow path of the throttle mechanism is blocked, the temperature efficiency of the use-side heat exchanger 21 that functions as an evaporator increases. The refrigeration cycle apparatus 100 according to the embodiment uses this phenomenon to determine whether or not the throttle mechanism 23 is abnormal. Therefore, the refrigeration cycle apparatus 100 according to the present embodiment can detect an abnormality in the throttle mechanism 23 having a fixed opening.

In addition, in this Embodiment, the refrigerating cycle apparatus which concerns on this invention was used as an air conditioner which performs cooling operation. However, the air conditioner that performs the cooling operation is an example of the application of the refrigeration cycle device according to the present invention. For example, a four-way valve that changes the flow path may be provided on the discharge side of the compressor 11, and the refrigeration cycle device according to the present invention may be used as an air conditioner capable of cooling and heating. Further, for example, the refrigerating cycle device according to the present invention may be used as a refrigerating device for refrigerating stored items in a room. Further, for example, the refrigeration cycle device according to the present invention may be used as a refrigeration device for refrigerating indoor stored materials.

DESCRIPTION OF SYMBOLS 1 heat source machine, 2 utilization machine, 3 control apparatus, 10 refrigeration cycle circuit, 11 compressor, 12 heat source side heat exchanger, 13 heat source side fan, 14 pressure sensor, 21 utilization side heat exchanger, 22 utilization side fan, 23 Throttle mechanism, 24 temperature sensor, 25 temperature sensor, 31 storage unit, 32 acquisition unit, 33 calculation unit, 34 comparison unit, 35 determination unit, 36 notification unit, 100 refrigeration cycle device.

Claims (4)

A throttle mechanism with a fixed opening,
A use side heat exchanger that functions as an evaporator, in which the refrigerant reduced in pressure by the throttle mechanism flows,
An announcing unit for announcing an abnormality,
Equipped with
A refrigeration cycle apparatus configured such that when the temperature efficiency of the usage-side heat exchanger becomes higher than a reference value, an abnormality of the throttle mechanism is notified by the notification unit. The utilization side heat exchanger is for performing heat exchange between the refrigerant and the air in the room,
The refrigerant temperature, which is the temperature of the refrigerant at the outlet of the utilization side heat exchanger, is Teo,
The evaporation temperature of the refrigerant flowing through the use side heat exchanger is Te,
The indoor temperature, which is the temperature of the indoor air, is set to Teai,
When the temperature efficiency is ηc,
The refrigeration cycle apparatus according to claim 1, which is represented by ηc=(Teo-Te)/(Teai-Te). Equipped with a control device,
The control device stores data representing the evaporation temperature, data representing the refrigerant temperature, and data representing the room temperature, and determines the temperature efficiency from these stored data to determine an abnormality of the throttle mechanism. The refrigeration cycle apparatus according to claim 2, wherein the refrigeration cycle apparatus is configured as described above. The refrigeration cycle apparatus according to claim 3, wherein the control device is configured to display an abnormality code on the notification unit when it is determined that the throttle mechanism is abnormal.

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