Control device, refrigeration cycle device including the same, refrigeration cycle system including the same, control method and control program

Abstract

To provide a control device capable of detecting wrong input of a freezing temperature by a user, a refrigeration cycle device including the control device, a refrigeration cycle system including the control device, a control method and a control program.SOLUTION: A control device 5 is for a refrigeration cycle device 2 that supplies fluid to be subject to heat exchange having an intended temperature by exchanging heat between a refrigerant and the fluid to be subject to heat exchange in a heat exchanger HE. The control device includes: a set information acquisition section 52 that acquires set information including a type and concentration of the fluid to be subject to heat exchange and a set freezing temperature that is a freezing temperature of the fluid to be subject to heat exchange set by a user; a freezing temperature calculation section 58 that calculates a calculation freezing temperature that is a freezing temperature of the fluid to be subject to heat exchange on the basis of the set information; and a wrong input detection section 59a that detects wrong input by the user by determining whether or not a freezing temperature difference between the set freezing temperature and the calculation freezing temperature is a predetermined value or larger.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a control device, a refrigeration cycle device including the control device, a refrigeration cycle system including the control device, a control method, and a control program. [Background technology]

[0002] 2. Description of the Related Art Conventionally, systems described in Patent Documents 1 and 2, for example, are known as conventional refrigeration cycle devices that supply a heat exchange fluid (for example, brine) cooled to a desired temperature. In such a refrigeration cycle device, the type and concentration of the heat exchange fluid used in the brine chiller generally differs from user to user. Furthermore, when using the brine chiller, the user must set the freezing temperature of the heat exchange fluid. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5289475 [Patent Document 2] Patent No. 5058324 Summary of the Invention [Problem to be solved by the invention]

[0004] In these refrigeration cycle devices, the freezing temperature of the heat exchange fluid is set by the user. The protection control of the refrigeration cycle device is performed based on the set freezing temperature. However, if the user sets the wrong freezing temperature, there is no means of detection, which may result in failure to operate as intended or even failure of the unit.

[0005] In addition, even if the freezing temperature is set correctly at the beginning of operation of the refrigeration cycle device, as operation continues, the concentration of the heat exchange fluid changes due to evaporation of the heat exchange fluid and absorption of moisture, and the freezing temperature also changes. This requires the user or an inspector to carry out regular maintenance and take the trouble of checking the concentration of the heat exchange fluid.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide a control device that can detect incorrect input of a freezing temperature by a user, a refrigeration cycle device equipped with the same, a refrigeration cycle system equipped with the same, a control method, and a control program. [Means for solving the problem]

[0007] A control device according to some embodiments of the present disclosure is a control device for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger, and includes a setting information acquisition unit that acquires setting information including the type and concentration of the heat-exchanged fluid and a set freezing temperature that is the freezing temperature of the heat-exchanged fluid set by a user, a freezing temperature calculation unit that uses the setting information to calculate a calculated freezing temperature that is the freezing temperature of the heat-exchanged fluid, and an erroneous input detection unit that detects erroneous input by the user by determining whether the difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is greater than or equal to a predetermined value.

[0008] A control device according to some embodiments of the present disclosure is a control device for a refrigeration cycle device that supplies a heat exchange fluid at a desired temperature by performing heat exchange between a refrigerant and a heat exchange fluid in a heat exchanger, and is equipped with a setting information acquisition unit that acquires setting information including the type and concentration of the heat exchange fluid, an operating state information acquisition unit that acquires operating state information including each physical quantity of the refrigerant and the heat exchange fluid, a first capacity calculation unit that calculates a first heat exchange amount, which is the heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information, a second capacity calculation unit that calculates a second heat exchange amount, which is the heat exchange amount of the heat exchange fluid in the heat exchanger, based on the setting information and the operating state information, and a concentration change detection unit that detects a change in concentration of the heat exchange fluid based on the difference between the first heat exchange amount and the second heat exchange amount.

[0009] A refrigeration cycle device according to some embodiments of the present disclosure includes any one of the control devices described above.

[0010] A refrigeration cycle system according to some embodiments of the present disclosure includes the above-described refrigeration cycle device and a control device for a fluid circuit through which the heat exchange fluid circulates.

[0011] A control method according to some embodiments of the present disclosure is a control method for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger, and includes a setting information acquisition step of acquiring setting information including the type and concentration of the heat-exchanged fluid and a set freezing temperature which is the freezing temperature of the heat-exchanged fluid set by a user, a freezing temperature calculation step of calculating a calculated freezing temperature which is the freezing temperature of the heat-exchanged fluid using the setting information, and an erroneous input detection step of detecting erroneous input by the user by determining whether the difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is greater than or equal to a predetermined value.

[0012] A control method according to some embodiments of the present disclosure is a control method for a refrigeration cycle device that supplies a heat exchange fluid at a desired temperature by performing heat exchange between a refrigerant and a heat exchange fluid in a heat exchanger, and includes a setting information acquisition step of acquiring setting information including the type and concentration of the heat exchange fluid, an operating state information acquisition step of acquiring operating state information including each physical quantity of the refrigerant and the heat exchange fluid, a first capacity calculation step of calculating a first heat exchange amount, which is the heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information, a second capacity calculation step of calculating a second heat exchange amount, which is the heat exchange amount of the heat exchange fluid in the heat exchanger, based on the setting information and the operating state information, and a concentration change detection step of detecting a change in concentration of the heat exchange fluid based on the difference between the heat exchange amounts of the first heat exchange amount and the second heat exchange amount.

[0013] A control program according to some embodiments of the present disclosure is a control program for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger, and causes a computer to execute a setting information acquisition process that acquires setting information including the type and concentration of the heat-exchanged fluid and a set freezing temperature that is the freezing temperature of the heat-exchanged fluid set by a user, a freezing temperature calculation process that uses the setting information to calculate a calculated freezing temperature that is the freezing temperature of the heat-exchanged fluid, and an erroneous input detection process that detects erroneous input by the user by determining whether the difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is greater than or equal to a predetermined value.

[0014] A control program according to some embodiments of the present disclosure is a control program for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger, and causes a computer to execute a setting information acquisition process that acquires setting information including the type and concentration of the heat-exchanged fluid, an operating state information acquisition process that acquires operating state information including each physical quantity of the refrigerant and the heat-exchanged fluid, a first capacity calculation process that calculates a first heat exchange amount, which is the heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information, a second capacity calculation process that calculates a second heat exchange amount, which is the heat exchange amount of the heat-exchanged fluid in the heat exchanger, based on the setting information and the operating state information, and a concentration change detection process that detects a change in concentration of the heat-exchanged fluid based on the difference between the first heat exchange amount and the second heat exchange amount. Effect of the Invention

[0015] According to the present disclosure, it is possible to detect an erroneous input of a freezing temperature by a user. [Brief description of the drawings]

[0016] [Figure 1] 1 is a diagram illustrating a schematic configuration of a refrigeration cycle system according to an embodiment of the present disclosure. [Diagram 2] 2 is a schematic configuration diagram showing an example of a hardware configuration of a control device of the refrigeration cycle device of FIG. 1. [Diagram 3] 1 is a graph showing an example of freezing temperature characteristics corresponding to the type and concentration of a heat exchange fluid. [Figure 4] 1 is a graph showing an example of characteristics of specific gravity corresponding to the type and concentration of a heat exchange fluid; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of a control device, a refrigeration cycle device including the control device, a refrigeration cycle system including the control device, a control method, and a control program according to the present disclosure will be described with reference to the drawings.

[0018] (Configuration of refrigeration cycle device) 1 is a diagram illustrating a schematic configuration of a refrigeration cycle system 1 according to an embodiment of the present disclosure. As illustrated in FIG. 1, the refrigeration cycle system 1 includes a fluid circuit 4 and a refrigeration cycle device 2.

[0019] (fluid circuit) The fluid circuit 4 is a fluid circuit in which the heat-exchanged fluid circulates, and as described later, the heat-exchanged fluid is heat-exchanged with the refrigerant circulating in the refrigerant circuit 3 in the heat exchanger HE, and the heat-exchanged fluid at a desired temperature is supplied to the equipment load 42. The fluid circuit 4 is provided with, for example, a pump 41, pressure sensors P1 and P2, and temperature sensors (temperature measuring units) T1 and T2. The heat-exchanged fluid is, for example, a fluid such as water, and may be simply water or may be brine mixed with an additive that lowers the freezing point. Here, in this embodiment, the heat-exchanged fluid is brine, and for example, ethylene glycol, Nybrine Z1, Nybrine NFP, Shobrine Blue, Shobrine PFP, etc. may be used.

[0020] The pump 41 delivers the heat exchange fluid so that the heat exchange fluid circulates through the fluid circuit 4. Here, the means for delivering the heat exchange fluid is not limited to a pump, and other types of delivery means may be used as long as they perform a similar function.

[0021] The pressure sensors P1 and P2 are provided, for example, at the inlet and outlet, respectively, of the heat exchanger HE in the fluid circuit 4. The pressure sensor P1 measures the pressure of the heat-exchanged fluid flowing into the heat exchanger HE. The pressure sensor P2 measures the pressure of the heat-exchanged fluid flowing out from the heat exchanger HE. The measured pressures are transmitted to the control device 5 and used to calculate the flow rate of the heat-exchanged fluid. Instead of the pressure sensors P1 and P2, a differential pressure gauge may be used that measures the pressure difference between the pressure of the heat-exchanged fluid flowing into the heat exchanger HE and the pressure of the heat-exchanged fluid flowing out from the heat exchanger HE.

[0022] The temperature sensors T1, T2 are provided, for example, at the inlet and outlet, respectively, of the heat exchanger HE in the fluid circuit 4. The temperature sensor (first temperature measurement unit) T1 measures the temperature of the heat-exchanged fluid flowing into the heat exchanger HE. The temperature sensor (second temperature measurement unit) T2 measures the temperature of the heat-exchanged fluid flowing out from the heat exchanger HE. The measured temperatures are transmitted to the control device 5 and used to calculate the flow rate of the heat-exchanged fluid. Of the temperature sensors T1, T2, when the temperature difference between the inlet and outlet of the heat exchanger HE is small, only the temperature sensor T1 that measures the temperature of the heat-exchanged fluid flowing into the heat exchanger HE may be provided.

[0023] (Refrigeration cycle equipment) The refrigeration cycle device 2 includes a refrigerant circuit 3, a control device 5, a storage unit 6, and a notification unit 7. Each component will be described in detail below.

[0024] (Refrigerant circuit) The refrigerant circuit 3 is a fluid circuit through which a refrigerant circulates, and includes a compressor 31, a heat exchanger 32, a pressure reducer 33, and a heat exchanger HE. The refrigerant circulating through the refrigerant circuit 3 may be, for example, HFC refrigerants such as R410A, R407C, R404A, etc., HCFC refrigerants such as R22, R134a, etc., or natural refrigerants such as hydrocarbons and helium. Note that the refrigerant circulating through the refrigerant circuit 3 is not limited to these, and may be other refrigerants as long as they have a similar refrigerant effect.

[0025] The compressor 31 compresses the refrigerant circulating through the refrigerant circuit 3. The compressor 31 is a compressor whose operating capacity is variable, and is configured, for example, as a positive displacement compressor driven by a motor controlled by an inverter. The compressor 31 may be configured such that two or more compressors are connected in parallel or in series.

[0026] Specifically, the heat exchanger 32 is a condenser in which heat is exchanged between a refrigerant and a heat exchange medium. The heat exchanger 32 is, for example, a fin-and-tube type heat exchanger including a heat transfer tube and a number of fins. The heat exchange medium is, for example, a fluid such as air, and is supplied to the heat exchanger 32 by a delivery means such as a fan.

[0027] The pressure reducer 33 adjusts the flow rate of the refrigerant flowing through the refrigerant circuit 3. As the pressure reducer 33, an electronic expansion valve capable of adjusting the aperture by a stepping motor (not shown), a mechanical expansion valve employing a diaphragm in the pressure receiving portion, a capillary tube, or the like may be used.

[0028] The heat exchanger HE is a heat exchanger in which heat is exchanged between the refrigerant circulating in the refrigerant circuit 3 whose pressure has been reduced by the pressure reducer 33 and the heat-exchanged fluid circulating in the fluid circuit 4. Specifically, the heat exchanger HE is an evaporator, and a fin-and-tube heat exchanger, for example, is used. The heat exchanger HE is a component of the refrigerant circuit 3 and also a component of the fluid circuit 4.

[0029] The pressure sensors P3 and P4 are provided, for example, at the inlet and outlet, respectively, of the compressor 31 in the refrigerant circuit 3. The pressure sensor P3 measures the pressure of the refrigerant flowing into the compressor 31. The pressure sensor P4 measures the pressure of the refrigerant flowing out from the compressor 31. The measured pressures are used to calculate the heat exchange amount, which will be described later. Instead of the pressure sensors P3 and P4, a differential pressure gauge measuring the pressure of the refrigerant flowing into the compressor 31 and the pressure of the refrigerant flowing out from the compressor 31 may be used.

[0030] Temperature sensors T3 and T4 are provided, for example, at the inlet and outlet, respectively, of the heat exchanger HE in the refrigerant circuit 3. Temperature sensor T1 measures the temperature of the heat-exchanged fluid flowing into the heat exchanger HE. Temperature sensor T2 measures the temperature of the heat-exchanged fluid flowing out of the heat exchanger HE. The measured temperatures are transmitted to the control device 5 and used to calculate the flow rate of the refrigerant and the amount of heat exchanged. Of the temperature sensors T1 and T2, when the temperature difference between the inlet and outlet of the heat exchanger HE is small, only temperature sensor T1 measuring the temperature of the heat-exchanged fluid flowing into the heat exchanger HE may be provided.

[0031] (Control device) The control device 5 uses parameters including pressures measured by the pressure sensors P1, P2, P3, and P4, temperatures measured by the temperature sensors T1, T2, T3, and T4, and setting information of the type and concentration of the heat exchange fluid input by the user to calculate the freezing temperature of the heat exchange fluid, the heat exchange amount in the refrigerant circuit 3, and the heat exchange amount in the fluid circuit 4, and controls the drive of the compressor 31 and the pressure reducer 33 provided in the refrigerant circuit 3, and the pump 41 provided in the fluid circuit 4. The control device 5 also includes an operating state information acquisition unit 51, a setting information acquisition unit 52, a physical property value calculation unit 53, a state quantity calculation unit 54, a refrigerant flow rate calculation unit 55a, a fluid side flow rate calculation unit 55b, a refrigerant capacity calculation unit (first capacity calculation unit) 56a, a fluid side capacity calculation unit (second capacity calculation unit) 56b, a set freezing temperature storage unit 57, a freezing temperature calculation unit 58, a detection unit 59, and an equipment drive control unit 60.

[0032] Here, Fig. 2 is a schematic diagram showing an example of a hardware configuration of the control device 5 of the refrigeration cycle device 2 of Fig. 1. As shown in Fig. 2, the control device 5 has a computer (computer system), and includes, for example, a CPU 5a, an auxiliary storage device (ROM) 5b for storing programs executed by the CPU 5a and data referenced by the programs, a main storage device (RAM) 5c that functions as a work area when each program is executed, a communication interface 5d for connecting to a network, an input / output unit 5e that receives input from an external device and outputs a control command to an external device that can communicate with the control device 5, and the like. These units are connected, for example, via a bus 5f. Examples of the auxiliary storage device 5b include a magnetic disk, a magneto-optical disk, and a semiconductor memory.

[0033] A series of processes for realizing various functions described later is stored in the auxiliary storage device 5b in the form of a program, for example, and the CPU 5a reads this program into the main storage device 5c and executes information processing and arithmetic processing to realize various functions. The program may be pre-installed in the auxiliary storage device 5b, provided in a state stored in another computer-readable storage medium, or distributed via wired or wireless communication means. The computer-readable storage medium may be a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, etc.

[0034] The operating state information acquisition unit 51 acquires operating state information including physical quantities such as the pressure of the heat exchange fluid measured by the pressure sensors P1, P2, the temperature of the heat exchange fluid measured by the temperature sensors T1, T2, the refrigerant pressure measured by the pressure sensors P3, P4, the refrigerant temperature measured by the temperature sensors T3, T4, and the displacement and rotation speed of the compressor 31. Then, the acquired operating state information is output to each of the physical property value calculation unit 53, the state quantity calculation unit 54, the refrigerant flow rate calculation unit 55a, and the fluid side flow rate calculation unit 55b. In the following explanation, the operating state information acquisition unit 51 is described as being capable of acquiring physical quantities such as the temperature of the refrigerant circulating through the refrigerant circuit 3 and the temperature, pressure, differential pressure, etc. of the heat-exchanged fluid circulating through the fluid circuit 4. However, this is not limited to the example, and the operating state information acquisition unit 51 may appropriately be equipped with a temperature acquisition unit that acquires the temperature of the refrigerant circulating through the refrigerant circuit 3 and at least one of the temperatures of the heat-exchanged fluid circulating through the fluid circuit 4, a pressure acquisition unit that acquires the temperature of the refrigerant circulating through the refrigerant circuit 3 and at least one of the pressures of the heat-exchanged fluid circulating through the fluid circuit 4, and a differential pressure acquisition unit that acquires the temperature of the refrigerant circulating through the refrigerant circuit 3 and at least one of the pressures of the heat-exchanged fluid circulating through the fluid circuit 4.

[0035] The setting information acquisition unit 52 acquires setting information of the type and concentration of the heat-exchanged fluid, and a set freezing temperature, which is the freezing temperature of the heat-exchanged fluid, set by the user. The setting information of the type and concentration of the heat-exchanged fluid is set by the user, for example, via a user interface (not shown). Here, the setting information of the type and concentration of the heat-exchanged fluid set by the user is used to calculate the physical property values ​​of the heat-exchanged fluid. The setting information acquisition unit 52 outputs the setting information of the type and concentration of the heat-exchanged fluid and the freezing temperature to each of the physical property value calculation unit 53, the set freezing temperature storage unit 57, and the freezing temperature calculation unit.

[0036] The physical property value calculation unit 53 calculates each physical property value, such as density, specific heat, kinetic viscosity, etc., of the refrigerant and the heat exchange fluid, using the operating state information (pressure, temperature, etc.) received from the operating state information acquisition unit 51 and the setting information of the type and concentration of the heat exchange fluid received from the setting information acquisition unit 52. Then, the physical property value calculation unit 53 outputs the operating state information, the setting information, and each calculated physical property value of the refrigerant and the heat exchange fluid to the refrigerant flow rate calculation unit 55a, the fluid side flow rate calculation unit 55b, and the fluid side capacity calculation unit 56b, respectively. The physical property calculation unit 53 may also calculate the temperature difference between the inlet and outlet of the heat exchanger HE of the refrigerant or heated fluid.

[0037] The state quantity calculation unit 54 calculates the enthalpies of the inlet and outlet of the heat exchanger HE using the operating state information received from the operating state information acquisition unit 51, specifically, the pressure of the refrigerant measured by the pressure sensor P3 and the temperatures of the refrigerant measured by the temperature sensors T3 and T4, and further calculates the enthalpy difference between the inlet and outlet of the heat exchanger HE. Note that, for the pressure used in calculating the enthalpy difference between the inlet and outlet of the heat exchanger HE, a value that takes into account the pressure loss generated by the heat exchanger HE with respect to the measurement result measured by the pressure sensor P3 may be used. In addition, in the present disclosure, an example in which each enthalpy is calculated using the pressure measured by the pressure sensor P3 provided on the inlet side of the compressor 31 will be described, but the present disclosure is not limited to this example, and more preferably, each enthalpy may be calculated using the pressure measured by a pressure sensor provided on the inlet side of the heat exchanger HE. Regarding the calculation of the enthalpy difference between the inlet and outlet of the heat exchanger HE, a known method may be appropriately adopted, and detailed explanation will be omitted.

[0038] Refrigerant flow rate calculation unit 55a calculates the flow rate of the refrigerant by using the pressures and temperatures of the refrigerant circuit 3 acquired by the operating state information acquisition unit 51, the physical property values ​​including the density, specific heat, and kinetic viscosity of the refrigerant calculated by the physical property value calculation unit 53, and the state quantities calculated by the state quantity calculation unit 54. Then, refrigerant flow rate calculation unit 55a outputs the calculated refrigerant flow rate to refrigerant capacity calculation unit 56a.

[0039] The fluid-side flow rate calculation unit 55b uses the operating state information to calculate the pressure difference between the pressure of the heat-exchanged fluid flowing into the heat exchanger HE and the pressure of the heat-exchanged fluid flowing out of the heat exchanger, and calculates the flow rate of the heat-exchanged fluid by using the calculated pressure difference and the density and kinetic viscosity of the heat-exchanged fluid calculated by the physical property value calculation unit 53. Then, the fluid-side flow rate calculation unit 55b outputs the calculated flow rate of the heat-exchanged fluid to the fluid-side capacity calculation unit 56b.

[0040] Here, the refrigerant flow rate calculation unit 55a and the fluid side flow rate calculation unit 55b may use an arithmetic expression for calculating a flow rate stored in the storage unit 6 described below in calculating the flow rate of the refrigerant or the heat exchange fluid. Furthermore, the refrigerant flow rate calculation unit 55a and the fluid side flow rate calculation unit 55b may output the calculation results to the outside by monitor display or the like in order to notify the user of the calculated flow rate of the refrigerant or the heat exchange fluid.

[0041] The refrigerant capacity calculation unit 56a calculates a first heat exchange amount, which is the heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information. Specifically, the refrigerant capacity calculation unit 56a calculates a heat exchange amount, which is the capacity of the refrigerant circuit 3, based on the calculation results of the state quantity calculation unit 54 and the refrigerant flow rate calculation unit 55a. Then, the refrigerant capacity calculation unit 56a outputs the first heat exchange amount to the concentration change detection unit 59b. Furthermore, the refrigerant capacity calculation unit 56a may output the calculation result to the outside by monitor display or the like to notify the user of the current capacity of the refrigerant circuit 3 based on the calculation result.

[0042] The fluid side capacity calculation unit 56b calculates a second heat exchange amount, which is the heat exchange amount of the heat exchange target fluid in the heat exchanger, based on the setting information and the operating state information. Specifically, the fluid side capacity calculation unit 56b calculates a heat exchange amount, which is the capacity of the fluid circuit 4, based on the calculation results of the physical property value calculation unit 53 and the fluid side flow rate calculation unit 55b. Then, the fluid side capacity calculation unit 56b outputs the second heat exchange amount to the concentration change detection unit 59b. Furthermore, the fluid side capacity calculation unit 56b may output the calculation result to the outside by a monitor display or the like to notify the user of the current capacity of the fluid circuit 4 based on the calculation result.

[0043] The fluid-side capacity calculation unit 56b calculates the change in specific gravity corresponding to the change in density of the heat-exchanged fluid, and calculates the concentration from the specific gravity of the heat-exchanged fluid. Furthermore, as described later, the fluid-side capacity calculation unit 56b calculates a correction amount for at least one of the setting information (type and concentration) and the set freezing temperature in response to the change in concentration of the heat-exchanged fluid detected by the concentration change detection unit 59b. The calculated correction amount is then transmitted to the notification unit 7.

[0044] The set freezing temperature storage unit 57 stores the set freezing temperature received from the setting information acquisition unit 52. Then, the set freezing temperature storage unit 57 outputs the set freezing temperature to the erroneous input detection unit 59a.

[0045] The freezing temperature calculation unit 58 calculates a calculated freezing temperature, which is the freezing temperature of the heat exchange fluid calculated using the type and concentration of the heat exchange fluid received from the setting information acquisition unit 52. The method of deriving the calculated freezing temperature will be described later in detail. Then, the freezing temperature calculation unit 58 outputs the calculated freezing temperature to the erroneous input detection unit 59a.

[0046] The detection unit 59 includes an erroneous input detection unit 59a and a density change detection unit 59b. The erroneous input detection unit 59a detects an erroneous input by a user by determining whether or not the difference between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value. The erroneous input detection unit 59a detects an erroneous input by a user, for example, during the initial setting of the refrigeration cycle device. This makes it possible to perform appropriate control based on the correct type and concentration of the heat exchange fluid. Furthermore, when the difference between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value, the erroneous input detection unit 59a outputs a command not to permit the start of the refrigeration cycle apparatus 2 to the equipment drive control unit 60. Furthermore, when the difference between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value, the erroneous input detection unit 59a may transmit a notification signal to the notification unit 7 to notify the user of the detection result.

[0047] The concentration change detection unit 59b detects the occurrence of a change in the concentration of the heat-exchanged fluid based on the difference between the first heat exchange amount and the second heat exchange amount. Here, the difference between the first heat exchange amount and the second heat exchange amount is equal to or greater than a predetermined value when the second heat exchange amount has changed since the start of operation, and the reason why the second heat exchange amount changes is because the concentration of the heat-exchanged fluid has changed since the start of operation. Therefore, the concentration change detection unit 59b can detect the occurrence of a change in the concentration of the heat-exchanged fluid based on the difference between the first heat exchange amount and the second heat exchange amount. Furthermore, when the difference between the first heat exchange amount and the second heat exchange amount is equal to or greater than a predetermined value, the concentration change detection unit 59b outputs a command to the device drive control unit 60 to stop the operation of the refrigeration cycle device.

[0048] Furthermore, the concentration change detection unit 59b outputs the detection result to the fluid side capacity calculation unit 56b when the difference between the first heat exchange amount and the second heat exchange amount is equal to or greater than a predetermined value. Furthermore, the erroneous input detection unit 59a may transmit a notification signal to the notification unit 7 to notify the user of the detection result when the difference between the first heat exchange amount and the second heat exchange amount is equal to or greater than a predetermined value.

[0049] The equipment drive control unit 60 controls the drive of the equipment during normal operation, and also controls the drive of each equipment such as the compressor 31, pressure reducer 33, and pump 41 based on commands corresponding to the detection results of the erroneous input detection unit 59a or the concentration change detection unit 59b. In addition, when the equipment drive control unit 60 receives a command from the erroneous input detection unit 59a or the concentration change detection unit 59b to perform an emergency stop when an abnormality occurs, the equipment drive control unit 60 may perform an emergency stop of each equipment provided in the refrigerant circuit 3 and the fluid circuit 4 based on this command.

[0050] (Storage part) The storage unit 6 is composed of a memory device such as a semiconductor memory or a hard disk drive. The storage unit 6 stores each calculation formula used by the physical property value calculation unit 53 when calculating physical property values ​​such as density and kinetic viscosity, and a flow rate calculation formula used by the fluid side flow rate calculation unit 55b when calculating the flow rate of the heat-exchanged fluid. The storage unit 6 also stores a plurality of data tables for obtaining each physical property value in which the temperature and the differential pressure are associated for each combination of the type and concentration of the heat-exchanged fluid. Examples of the plurality of data tables include a density table showing the relationship between the density and the temperature, type, and concentration of the heat-exchanged fluid, a viscosity table showing the relationship between the viscosity and the temperature, type, and concentration of the heat-exchanged fluid, a specific heat table showing the relationship between the specific heat and the temperature, type, and concentration of the heat-exchanged fluid, a specific gravity table showing the relationship between the specific gravity and the concentration of the heat-exchanged fluid, and a freezing temperature table showing the relationship between the freezing temperature and the concentration of the heat-exchanged fluid. Each calculation formula used by the physical property calculation unit 53 and the flow rate calculation formula used by the fluid side flow rate calculation unit 55b are derived using at least one of a plurality of data tables. The storage unit 6 may store specifications such as dimensions of the pipe through which the heat exchange fluid flows. The storage unit 6 can communicate with the control device 5, and each calculation unit included in the control device 5 may use each table stored in the storage unit 6 when performing calculations. The storage unit 6 is configured with a memory device such as a semiconductor memory or a hard disk device, and is not limited to a configuration provided in the control device 5. The storage unit 6 only needs to be provided so as to be accessible by the control device 5, and may be a cloud service, for example, online storage.

[0051] (Notification Department) The notification unit 7 is a display screen such as an LED (Light Emitting Diode) or a CRT (Cathode Ray Tube) or a liquid crystal screen, and outputs information onto the screen. For example, if there is an abnormality in the operating state of the refrigeration cycle device 2, the notification unit 7 displays and outputs the abnormality in response to an instruction from the control device 5. Furthermore, the notification unit 7 may include an audio output unit such as a speaker, and output information by audio such as an alarm instead of or in addition to displaying the information on the screen. Furthermore, the notification unit 7 may have a communication line and output communication data to a remote location.

[0052] According to the refrigeration cycle apparatus 2 having the above-mentioned configuration, it is possible to detect an erroneous input of the freezing temperature of the heat exchange fluid set by the user at the start of the refrigeration cycle apparatus 2. In addition, it is possible to detect the occurrence of a change in concentration of the heat exchange fluid while the refrigeration cycle apparatus 2 is continuing to operate.

[0053] (Detection target 1: Freezing temperature of heat exchange fluid) The following describes in detail a method for detecting an erroneous input by a user by determining the difference between the set freezing temperature and the calculated freezing temperature. First, in setting the freezing temperature of the heat exchange fluid in the refrigeration cycle device 2, there are two types of freezing temperatures of the heat exchange fluid: a set freezing temperature, which is the freezing temperature of the heat exchange fluid set by the user, and a calculated freezing temperature, which is calculated using setting information including the type and concentration of the heat exchange fluid set by the user.

[0054] Here, the freezing temperature has characteristics corresponding to the type and concentration of the heat-exchanged fluid. Fig. 3 is a graph showing an example of the freezing temperature characteristics corresponding to the type and concentration of the heat-exchanged fluid. In Fig. 3, the horizontal axis is the concentration of the heat-exchanged fluid, and the vertical axis is the freezing temperature of the heat-exchanged fluid. Here, the storage unit 6 may store characteristics corresponding to the type and concentration of the heat-exchanged fluid, or may store in advance an approximation formula generated from the freezing temperature characteristics corresponding to the type and concentration of the heat-exchanged fluid.

[0055] When the control device 5 detects an erroneous input of the freezing temperature of the heat exchange fluid by the user, first, the setting information acquisition unit 52 acquires setting information including the type and concentration of the heat exchange fluid and the set freezing temperature. Then, the set freezing temperature storage unit 57 stores the set freezing temperature output from the setting information acquisition unit 52. Furthermore, the freezing temperature calculation unit 58 calculates a calculated freezing temperature using the setting information of the heat exchange fluid and an approximation equation for calculating the freezing temperature according to the type and concentration of the heat exchange fluid stored in the storage unit 6.

[0056] Then, the set freezing temperature and the calculated freezing temperature are output to erroneous input detection unit 59a. Erroneous input detection unit 59a detects an erroneous input by the user by determining whether or not the difference between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value. Furthermore, erroneous input detection unit 59a determines that the freezing temperature set by the user is incorrect and detects an erroneous input by the user, for example, when the difference between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value.

[0057] When the erroneous input detection unit 59a detects an erroneous input by the user, it outputs a command not to permit the start of the refrigeration cycle apparatus 2 to the equipment drive control unit 60. The erroneous input detection unit 59a may transmit a notification signal to the notification unit 7 to notify the user of the detection result of the erroneous input by the user. The notification signal transmitted by the erroneous input detection unit 59a to the notification unit 7 may simply notify that the set freezing temperature deviates from the calculated freezing temperature. Furthermore, the notification signal may notify the set freezing temperature to be input according to the difference between the set freezing temperature and the calculated freezing temperature.

[0058] As described above, the erroneous input detection unit can detect an erroneous input of a freezing temperature by determining whether the difference between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value. In this way, by determining whether the freezing temperature set by the user is consistent with the freezing temperature calculated based on the type and concentration of the heat exchange fluid set by the user, it is possible to determine whether or not the user has made an incorrect setting.

[0059] Also, unlike the above example, if the user correctly sets the freezing temperature but incorrectly inputs the type and concentration of the heat exchange fluid, the user's incorrect input regarding the heat exchange fluid setting can be detected and notified by determining whether the difference between the set freezing temperature and the calculated freezing temperature is greater than or equal to a predetermined value.

[0060] (Detection target 2: Change in concentration of heat exchange fluid) In addition, a method for calculating the capacity of the refrigeration cycle device 2 and the change in concentration of the heat exchange fluid using the above-mentioned configuration will be described below. First, when the refrigerant and the heat-exchanged fluid exchange heat through the heat exchanger HE, the amount of heat exchanged in the heat exchanger HE changes depending on the operating state of the refrigeration cycle apparatus 2. The amount of heat exchanged of the refrigerant in the heat exchanger HE and the amount of heat exchanged of the heat-exchanged fluid in the heat exchanger HE are equal if the concentration of the heat-exchanged fluid is normal. For this reason, if the amount of heat exchanged in the refrigerant circuit 3 and the amount of heat exchanged in the fluid circuit 4 are not equal, it can be considered that the concentration of the heat-exchanged fluid has changed.

[0061] To check the concentration change of the heat exchange fluid, first, the refrigerant capacity calculation unit 56a calculates a first heat exchange amount Qr in the refrigerant circuit 3 using the calculation results of the state quantity calculation unit 54 and the refrigerant flow rate calculation unit 55a. Similarly, the fluid side capacity calculation unit 56b calculates a second heat exchange amount Qb in the fluid circuit 4 using the calculation results of the physical property value calculation unit 53 and the fluid side flow rate calculation unit 55b. Then, the concentration change detection unit 59b compares the calculated heat exchange amounts to detect the occurrence of a concentration change of the heat exchange fluid based on the difference between the first heat exchange amount and the second heat exchange amount.

[0062] A method for calculating the first heat exchange amount Qr, which is the heat exchange amount in the refrigerant circuit 3, will be described below. First, the state quantity calculation unit 54 calculates the enthalpy difference between the inlet and outlet of the heat exchanger HE using the operating state information (pressure, temperature) acquired by the operating state information acquisition unit 51. Furthermore, the refrigerant flow rate calculation unit 55a calculates the flow rate of the refrigerant by using the displacement and rotation speed of the compressor 31 acquired by the operating state information acquisition unit 51 and the density of the refrigerant calculated by the physical property value calculation unit 53. Note that, in order to derive the enthalpy difference between the inlet and outlet of the heat exchanger HE, the memory unit 6 stores a ph diagram of the refrigerant circulating through the refrigerant circuit 3, and this ph diagram may be used.

[0063] Next, the refrigerant capacity calculation unit 56a calculates a first heat exchange amount Qr by the following formula (1) using the calculation results of the state quantity calculation unit 54 and the refrigerant flow rate calculation unit 55a. In formula (1), Gr is the flow rate of the refrigerant calculated by the refrigerant flow rate calculation unit 55a. Also, Δh is the enthalpy difference between the inlet and outlet of the heat exchanger HE calculated by the state quantity calculation unit 54.

[0064]

number

[0065] Next, a method for calculating the second heat exchange amount Qb, which is the heat exchange amount in the fluid circuit 4, will be described. First, the physical property value calculation unit 53 calculates the density, specific heat, kinetic viscosity, and temperature difference of the heat-exchanged fluid between the inlet and outlet of the heat exchanger HE, using the operating state information (pressure, temperature) acquired by the operating state information acquisition unit 51 and the setting information (type and concentration) of the heat-exchanged fluid acquired by the setting information acquisition unit 52. Furthermore, the fluid-side flow rate calculation unit 55b calculates the flow rate of the heat-exchanged fluid by using the physical property values ​​calculated by the physical property value calculation unit 53 and the pressure difference between the inlet and outlet of the heat exchanger HE acquired by the operating state information acquisition unit 51. Here, the flow rate of the heat exchange fluid may be calculated using an approximate equation derived from the physical properties of the heat exchange fluid calculated using the setting information (type and concentration) and temperature of the heat exchange fluid. Note that the pressure difference between the inlet and outlet of the heat exchanger HE of the fluid circuit 4 may be a value measured using a differential pressure gauge.

[0066] Next, the fluid side capacity calculation unit 56b calculates the first heat exchange amount Qr by the following formula (2) using the calculation results of the physical property value calculation unit 53 and the fluid side flow rate calculation unit 55b. In formula (2), Gb is the flow rate of the heat-exchanged fluid calculated by the fluid side flow rate calculation unit 55b. Also, ρ is the density of the heat-exchanged fluid calculated by the physical property value calculation unit 53, V is the flow rate of the heat-exchanged fluid calculated by the fluid side flow rate calculation unit 55b, c is the specific heat of the heat-exchanged fluid calculated by the physical property value calculation unit 53, and ΔT is the temperature difference of the heat-exchanged fluid between the inlet and outlet of the heat exchanger HE calculated by the physical property value calculation unit 53.

[0067]

number

[0068] Here, if the concentration change detection unit 59b detects that a difference occurs between the first heat exchange amount Qr and the second heat exchange amount Qb, this means that the concentration of the heat exchange fluid has changed since the beginning of operation, and the density ρ, flow rate V, and specific heat c of the heat exchange fluid have changed in the fluid circuit 4. In other words, the occurrence of a change in the concentration of the heat exchange fluid can be detected from the difference between the first heat exchange amount Qr and the second heat exchange amount Qb.

[0069] In addition, when the concentration change detection unit 59b detects that the concentration of the heat exchange fluid has changed, for example, when the difference in the heat exchange amount between the first heat exchange amount Qr and the second heat exchange amount Qb is greater than or equal to a predetermined value, the equipment drive control unit 60 may stop operation of each equipment provided in the refrigeration cycle device 2.

[0070] In addition, when the concentration change detection unit 59b detects a change in the concentration of the heat exchange fluid, in addition to stopping the operation of each device equipped in the refrigeration cycle device 2, the concentration change may be calculated and a correction amount for at least one of the setting information and the freezing temperature of the heat exchange fluid may be calculated, and the user may be notified.

[0071] When a difference occurs between the first heat exchange amount Qr and the second heat exchange amount Qb, that is, when a difference occurs between the second heat exchange amount Qb at the beginning of operation of the refrigeration cycle apparatus 2 and the current second heat exchange amount Qb, the second heat exchange amount Qb changes due to changes in each of the density ρ, the flow rate V, and the specific heat c in the formula (2). Therefore, the concentration of the heat exchange fluid can be calculated using the changes in each of the density ρ, the flow rate V, and the specific heat c from the beginning of operation of the refrigeration cycle apparatus 2 to the present.

[0072] FIG. 4 is a graph illustrating the characteristics of specific gravity corresponding to the type and concentration of the heat-exchanged fluid. In FIG. 4, the horizontal axis is the concentration of the heat-exchanged fluid, and the vertical axis is the specific gravity of the heat-exchanged fluid. Here, specific gravity is the ratio between the density of the heat-exchanged fluid and the density of a standard substance (e.g., water). Therefore, there is a correlation between density and specific gravity, and the specific gravity also changes as the density changes. That is, the fluid-side capacity calculation unit 56b calculates the change in specific gravity corresponding to the change in density, and can calculate the concentration after the change from the specific gravity of the heat-exchanged fluid after the change using the relationship illustrated in FIG. 4. Furthermore, the freezing temperature of the heat-exchanged fluid can be derived from the concentration of the heat-exchanged fluid, as illustrated in FIG. 3. Therefore, the fluid-side capacity calculation unit 56b can calculate not only the change in concentration of the heat-exchanged fluid but also the change in freezing temperature of the heat-exchanged fluid by calculating the difference between the first heat exchange amount Qr and the second heat exchange amount Qb.

[0073] In this way, the fluid side capacity calculation unit 56b can calculate the concentration and freezing temperature of the heat exchange fluid that have changed since the beginning of operation of the refrigeration cycle apparatus 2, and can therefore calculate a correction amount for at least one of the setting information and the freezing temperature of the heat exchange fluid. The correction amount calculated by the fluid side capacity calculation unit 56b may be notified to the user by the notification unit 7.

[0074] Even when a change in the concentration of the heat exchange fluid occurs, for example, when the concentration changes due to evaporation or moisture absorption, the fluid side capacity calculation unit 56b can calculate a correction amount of the concentration of the heat exchange fluid to make the capacity of the refrigeration cycle apparatus 2 equivalent to that at the beginning of operation. In addition, the calculation result is notified to the user by the notification unit 7, so that the user can grasp the change in the concentration of the heat exchange fluid and can correct the concentration of the heat exchange fluid to make the refrigeration cycle apparatus 2 output a predetermined capacity.

[0075] In addition, even if the concentration of the heat exchange fluid changes due to evaporation or moisture absorption of the heat exchange fluid after the equipment is installed, an abnormality is notified, and the refrigeration cycle device 2 is prevented from continuing to operate when the physical properties of the heat exchange fluid are abnormal, thereby preventing the occurrence of breakdowns and accidents. Furthermore, by performing regular maintenance, it is possible to save the effort of checking the concentration of the heat exchange fluid.

[0076] In the above example, the concentration and freezing temperature of the heat-exchanged fluid are calculated by the fluid-side capacity calculation unit 56b, but instead, a data table showing the relationship between the concentration and freezing temperature of the heat-exchanged fluid and a data table showing the relationship between the concentration and freezing temperature of the heat-exchanged fluid may be stored in the storage unit 6. In this case, the fluid-side capacity calculation unit 56b may determine the correction amounts for the concentration and freezing temperature of the heat-exchanged fluid by referring to each data table.

[0077] In the present embodiment, the fluid is obtained by calculation, but this is not limiting. For example, a flow meter may be provided and the flow rate measured by the flow meter may be used.

[0078] (Additional Notes) Although the present disclosure has been described above using the embodiments, the technical scope of the present disclosure is not limited to the scope described in the above embodiments. Various modifications or improvements can be made to the above embodiments without departing from the gist of the present disclosure, and the forms in which such modifications or improvements are made are also included in the technical scope of the present disclosure. In addition, the above embodiments may be appropriately combined.

[0079] The control device, the refrigeration cycle device including the control device, the refrigeration cycle system including the control device, the control method, and the control program described in the above-described embodiments can be understood, for example, as follows. The control device (5) according to the first aspect of the present disclosure is a control device for a refrigeration cycle device that supplies a heat exchange fluid at a desired temperature by performing heat exchange between a refrigerant and a heat exchange fluid in a heat exchanger, and includes a setting information acquisition unit (52) that acquires setting information including the type and concentration of the heat exchange fluid and a set freezing temperature which is the freezing temperature of the heat exchange fluid set by a user, a freezing temperature calculation unit (58) that uses the setting information to calculate a calculated freezing temperature which is the freezing temperature of the heat exchange fluid, and an erroneous input detection unit (59a) that detects erroneous input by the user by determining whether the difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is greater than or equal to a predetermined value.

[0080] According to the control device of the present disclosure, the control device is a control device for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger. The setting information acquisition unit acquires setting information including the type and concentration of the heat-exchanged fluid and a set freezing temperature that is the freezing temperature of the heat-exchanged fluid set by a user, and the freezing temperature calculation unit calculates a calculated freezing temperature that is the calculated freezing temperature of the heat-exchanged fluid using the setting information. The erroneous input detection unit then determines whether the difference between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value, thereby detecting an erroneous input of the freezing temperature by the user. In this way, the presence or absence of a setting error by the user can be determined by determining whether the freezing temperature set by the user and the freezing temperature calculated based on the type and concentration of the heat-exchanged fluid set by the user are consistent.

[0081] The control device according to a second aspect of the present disclosure, in the first aspect, does not permit start-up of the refrigeration cycle device when a difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value.

[0082] According to the control device of the present disclosure, when the difference between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value, the control device does not permit the start of each device of the refrigeration cycle. This makes it possible to prevent the start and operation of the refrigeration cycle device with the incorrect setting even if the setting of the heat exchange fluid is incorrect.

[0083] The control device according to a third aspect of the present disclosure, in the first or second aspect, includes a notification unit (7) that notifies a user of a detection result of the erroneous input detection unit.

[0084] According to the control device of the present disclosure, the control device includes a notification unit that notifies a user of the detection result of the erroneous input detection unit, and thereby, when the setting of the heat exchange fluid is incorrect, the user is notified of the detection result, and the user is prompted to re-input the set freezing temperature.

[0085] A refrigeration cycle device according to a fourth aspect of the present disclosure, in any one of the first to third aspects, includes an operating state information acquisition unit (51) that acquires operating state information including each physical quantity of the refrigerant and the heat exchange fluid, a first capacity calculation unit (56a) that calculates a first heat exchange amount, which is the heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information, a second capacity calculation unit (56b) that calculates a second heat exchange amount, which is the heat exchange amount of the heat exchange fluid in the heat exchanger, based on the setting information and the operating state information, and a concentration change detection unit (59b) that detects the occurrence of a change in concentration of the heat exchange fluid based on the difference between the first heat exchange amount and the second heat exchange amount.

[0086] According to the control device of the present disclosure, the operating state information acquisition unit acquires operating state information including each physical quantity of the refrigerant and the heat exchange fluid, the first capacity calculation unit calculates a first heat exchange amount based on the setting information and the operating state information, and the second capacity calculation unit calculates a second heat exchange amount based on the setting information and the operating state information. The concentration change detection unit detects the occurrence of a change in concentration of the heat exchange fluid based on the difference between the first heat exchange amount and the second heat exchange amount. A large difference between the first heat exchange amount and the second heat exchange amount means that the concentration change of the heat exchange fluid from the start of operation is large. In this way, when the concentration of the heat exchange fluid changes due to evaporation or absorption of moisture, the concentration change detection unit can detect the change in concentration of the heat exchange fluid.

[0087] The control device according to a fifth aspect of the present disclosure, in the fourth aspect, stops operation of each device included in the refrigeration cycle apparatus when a difference in heat exchange amount between the first heat exchange amount and the second heat exchange amount is greater than or equal to a predetermined value.

[0088] According to the control device of the present disclosure, when the difference between the first heat exchange amount and the second heat exchange amount is equal to or greater than a predetermined value, the operation of each device included in the refrigeration cycle is stopped. As a result, when the concentration of the heat exchange fluid changes due to evaporation or absorption of moisture, the operation of each device included in the refrigeration cycle is stopped, thereby preventing the operation of each device included in the refrigeration cycle from continuing in a state where the concentration of the heat exchange fluid is inconsistent with the initial setting.

[0089] The control device according to the sixth aspect of the present disclosure, in the fourth or fifth aspect, is provided with an alarm unit (7) that notifies a user of the detection result of the concentration change detection unit, and the second capacity calculation unit calculates a correction amount for at least one of the setting information and the set freezing temperature based on the change in concentration of the heat exchange fluid detected by the concentration change detection unit, and the alarm unit notifies a user of the correction amount.

[0090] According to the control device of the present disclosure, the second capacity calculation unit calculates a correction amount for at least one of the setting information and the set freezing temperature based on the concentration change of the heat-exchanged fluid detected by the concentration change detection unit, and notifies the user of the correction amount by the notification unit. As a result, the correction amount for at least one of the setting information (type, concentration) and the set freezing temperature of the heat-exchanged fluid is notified to the user, so the user can correct the concentration and freezing temperature of the heat-exchanged fluid using the notified correction amount. Therefore, even if an inconsistency occurs between the concentration of the heat-exchanged fluid and the initial setting, the heat-exchanged fluid can be quickly reset. In addition, if an abnormality in the concentration is detected, the correction amount is notified to the user, so that the effort of checking the concentration of the heat-exchanged fluid through regular maintenance can be eliminated.

[0091] A control device according to a seventh aspect of the present disclosure is a control device for a refrigeration cycle device that supplies a heat exchange fluid at a desired temperature by performing heat exchange between a refrigerant and a heat exchange fluid in a heat exchanger, and is equipped with a setting information acquisition unit (52) that acquires setting information including the type and concentration of the heat exchange fluid, an operating state information acquisition unit (51) that acquires operating state information including each physical quantity of the refrigerant and the heat exchange fluid, a first capacity calculation unit (56a) that calculates a first heat exchange amount, which is the heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information, a second capacity calculation unit (56b) that calculates a second heat exchange amount, which is the heat exchange amount of the heat exchange fluid in the heat exchanger, based on the setting information and the operating state information, and a concentration change detection unit (59b) that detects a change in concentration of the heat exchange fluid based on the difference between the first heat exchange amount and the second heat exchange amount.

[0092] According to the control device of the present disclosure, the control device is a control device for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant circulating in the refrigeration cycle and a heat-exchanged fluid in a heat exchanger provided in the refrigeration cycle. The setting information acquisition unit acquires setting information including the type and concentration of the heat-exchanged fluid, and the operating state information acquisition unit acquires operating state information including each physical quantity of the refrigerant and the heat-exchanged fluid. The first capacity calculation unit calculates a first heat exchange amount based on the setting information and the operating state information, and the second capacity calculation unit calculates a second heat exchange amount based on the setting information and the operating state information. The concentration change detection unit detects the occurrence of a change in concentration of the heat-exchanged fluid based on the difference between the first heat exchange amount and the second heat exchange amount. A large difference between the first heat exchange amount and the second heat exchange amount means a large change in concentration of the heat-exchanged fluid from the start of operation. That is, in the case where the concentration of the heat exchange fluid changes due to evaporation or absorption of moisture, the concentration change detection section can detect the change in concentration of the heat exchange fluid.

[0093] A refrigeration cycle apparatus (2) according to an eighth aspect of the present disclosure includes the control device according to any one of the first to seventh aspects.

[0094] A refrigeration cycle system (1) according to a ninth aspect of the present disclosure includes the refrigeration cycle apparatus according to the seventh aspect, and a fluid circuit (4) through which the heat exchange fluid circulates.

[0095] A control method according to a tenth aspect of the present disclosure is a control method for a refrigeration cycle device that supplies a heat exchange fluid at a desired temperature by performing heat exchange between a refrigerant and a heat exchange fluid in a heat exchanger, and includes a setting information acquisition step of acquiring setting information including the type and concentration of the heat exchange fluid and a set freezing temperature which is the freezing temperature of the heat exchange fluid set by a user, a freezing temperature calculation step of calculating a calculated freezing temperature which is the freezing temperature of the heat exchange fluid using the setting information, and an erroneous input detection step of detecting erroneous input by the user by determining whether the difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is greater than or equal to a predetermined value.

[0096] A control method according to an eleventh aspect of the present disclosure is a control method for a refrigeration cycle device that supplies a heat exchange fluid at a desired temperature by performing heat exchange between a refrigerant and a heat exchange fluid in a heat exchanger, and includes a setting information acquisition step of acquiring setting information including the type and concentration of the heat exchange fluid, an operating state information acquisition step of acquiring operating state information including each physical quantity of the refrigerant and the heat exchange fluid, a first capacity calculation step of calculating a first heat exchange amount, which is the heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information, a second capacity calculation step of calculating a second heat exchange amount, which is the heat exchange amount of the heat exchange fluid in the heat exchanger, based on the setting information and the operating state information, and a concentration change detection step of detecting a change in concentration of the heat exchange fluid based on the difference between the heat exchange amounts of the first heat exchange amount and the second heat exchange amount.

[0097] A control program according to a twelfth aspect of the present disclosure is a control program for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger, and causes a computer to execute a setting information acquisition process that acquires setting information including the type and concentration of the heat-exchanged fluid and a set freezing temperature that is the freezing temperature of the heat-exchanged fluid set by a user, a freezing temperature calculation process that uses the setting information to calculate a calculated freezing temperature that is the freezing temperature of the heat-exchanged fluid, and an erroneous input detection process that detects erroneous input by the user by determining whether the difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is greater than or equal to a predetermined value.

[0098] A control program according to a thirteenth aspect of the present disclosure is a control program for a refrigeration cycle device that supplies a heat exchange fluid at a desired temperature by performing heat exchange between a refrigerant and a heat exchange fluid in a heat exchanger, and causes a computer to execute a setting information acquisition process that acquires setting information including the type and concentration of the heat exchange fluid, an operating state information acquisition process that acquires operating state information including each physical quantity of the refrigerant and the heat exchange fluid, a first capacity calculation process that calculates a first heat exchange amount, which is the heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information, a second capacity calculation process that calculates a second heat exchange amount, which is the heat exchange amount of the heat exchange fluid in the heat exchanger, based on the setting information and the operating state information, and a concentration change detection process that detects a change in concentration of the heat exchange fluid based on the difference between the first heat exchange amount and the second heat exchange amount. [Explanation of symbols]

[0099] 1 Refrigeration cycle system 2 Refrigeration cycle equipment 3 Refrigerant circuit 4 Fluid circuit 5. Control device 5a CPU 5b Auxiliary storage device (ROM) 5c Main memory (RAM) 5d Communication Interface 5e Input / output section 5F Bus 6 Memory section 7. Notification Department 31 Compressor 32 Heat exchanger 33 Pressure reducer 41 Pump 42 Equipment load 51 Operation status information acquisition unit 52 Setting information acquisition unit 53 Physical property calculation section 54 State quantity calculation section 55a Refrigerant flow rate calculation section 55b Fluid side flow rate calculation section 56a Refrigerant capacity calculation unit 56b Fluid side capacity calculation section 57 Set freezing temperature memory section 58 Freezing temperature calculation section 59 Detection unit 59a False input detection section 59b Concentration change detection unit 60 Device drive control unit HE heat exchanger P1~P4 Pressure sensors T1~T4 Temperature sensors

Claims

1. A control device for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger, a setting information acquisition unit that acquires setting information including the type and concentration of the heat exchange fluid and a setting freezing temperature that is the freezing temperature of the heat exchange fluid set by a user; a freezing temperature calculation unit that calculates a calculated freezing temperature, which is the freezing temperature of the heat exchange fluid, using the setting information; an erroneous input detection unit that detects an erroneous input by a user by determining whether or not a difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value; A control device comprising:

2. The control device according to claim 1 , wherein the control device does not permit activation of the refrigeration cycle device when a difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value.

3. The control device according to claim 1 , further comprising a notification unit that notifies a user of a detection result of the erroneous input detection unit.

4. an operating state information acquisition unit that acquires operating state information including physical quantities of the refrigerant and the heat exchange fluid; a first capacity calculation unit that calculates a first heat exchange amount, which is a heat exchange amount of the refrigerant in the heat exchanger, based on the setting information and the operating state information; a second capacity calculation unit that calculates a second heat exchange amount, which is a heat exchange amount of the heat exchange target fluid in the heat exchanger, based on the setting information and the operating state information; a concentration change detection unit that detects the occurrence of a change in concentration of the heat exchange fluid based on a difference between the first heat exchange amount and the second heat exchange amount; The control device according to claim 1 , comprising:

5. The control device according to claim 4 , wherein when a difference between the first heat exchange amount and the second heat exchange amount is equal to or greater than a predetermined value, operation of each device included in the refrigeration cycle device is stopped.

6. a notification unit that notifies a user of a detection result of the concentration change detection unit; the second capacity calculation unit calculates a correction amount for at least one of the setting information and the set freezing temperature based on the change in concentration of the heat exchange fluid detected by the concentration change detection unit; The control device according to claim 4 , wherein the notification unit notifies a user of the correction amount.

7. A refrigeration cycle device comprising the control device according to claim 1.

8. The refrigeration cycle device according to claim 7; a fluid circuit through which the heat exchange fluid circulates; A refrigeration cycle system comprising:

9. A control method for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger, comprising: a setting information acquisition step of acquiring setting information including the type and concentration of the heat exchange fluid and a setting freezing temperature which is the freezing temperature of the heat exchange fluid set by a user; a freezing temperature calculation step of calculating a calculated freezing temperature, which is the freezing temperature of the heat exchange fluid, using the setting information; an erroneous input detection step of detecting an erroneous input by a user by determining whether or not a difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value; A control method comprising:

10. A control program for a refrigeration cycle device that supplies a heat-exchanged fluid at a desired temperature by performing heat exchange between a refrigerant and a heat-exchanged fluid in a heat exchanger, comprising: a setting information acquisition process for acquiring setting information including the type and concentration of the heat exchange fluid and a setting freezing temperature, which is the freezing temperature of the heat exchange fluid set by a user; a freezing temperature calculation process for calculating a calculated freezing temperature, which is the freezing temperature of the heat exchange fluid, using the setting information; an erroneous input detection process for detecting an erroneous input by a user by determining whether or not a difference in freezing temperature between the set freezing temperature and the calculated freezing temperature is equal to or greater than a predetermined value; A control program that causes a computer to execute the above.

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