WO2012029764A1

WO2012029764A1 - Cooling system control device and cooling system provided therewith

Info

Publication number: WO2012029764A1
Application number: PCT/JP2011/069577
Authority: WO
Inventors: 宮治　伸
Original assignee: 三洋電機株式会社
Priority date: 2010-08-31
Filing date: 2011-08-30
Publication date: 2012-03-08
Also published as: JP2013231519A

Abstract

[Problem] To make it possible to appropriately continue control even if a measurement value cannot be obtained in the case where a cooling system is to be controlled according to the measurement value. [Solution] An integrated management controller (10) is provided with a measurement value obtaining unit (111) that obtains a measurement value, a low pressure setting value determination unit (112) that determines a low pressure setting value Ps which is to be set for a device controller (3), a control unit (113) that sets the low pressure setting value Ps, which is to be set for the device controller (3), for the device controller (3), and a database (13) that accumulates the low pressure setting values Ps which have been set for the device controller (3) while associating the setting values with the measurement values, and in the case where the measurement value cannot be obtained, the low pressure setting value determination unit (112) determines one of the low pressure setting values Ps stored in the database (13) as a low pressure setting value Ps which is to be set for the device controller (3) according to an appearance frequency.

Description

COOLING SYSTEM CONTROL DEVICE AND COOLING SYSTEM HAVING THE SAME

The present invention relates to a cooling system control device and a cooling system including the same.

In stores and factories, it is attempted to save energy by controlling the cooling equipment so that the settings differ depending on the environment. For example, in Patent Document 1, a low-pressure side pressure set value set for a refrigerator that cools a low-temperature showcase is stored in a database of a controller in association with an environmental condition such as an in-store temperature or an out-of-store temperature. The low-pressure side pressure setting value corresponding to the acquired environmental condition is read from the database and set in the refrigerator, thereby reducing the power consumption of the refrigerator while maintaining a good cooling state in the low-temperature showcase. I'm trying to lower it.

JP 2004-257666 A

By the way, when a store or a factory is large-scale, the distance between devices becomes long, and noise may be generated in a communication line connecting the devices, and information may not be transmitted. However, in the technique described in Patent Document 1, when the environmental condition is not transmitted from the measuring device to the controller, the controller cannot appropriately read the low pressure side pressure set value from the database, and thus appropriately controls the refrigerator. I can't.

The present invention has been made in view of such a background, and in the case of controlling the cooling system according to the measurement value, the cooling system capable of appropriately continuing the control even when the measurement value cannot be acquired. It is an object of the present invention to provide a control device and a cooling system including the control device.

A main invention of the present invention for solving the above-mentioned problems is a control device for controlling the cooling system by setting a parameter for the operation of the cooling system in the cooling system, and an environment in which the cooling system is installed A measurement value acquisition unit for acquiring a measurement value for evaluating the parameter, a parameter determination unit for determining a parameter to be set in the cooling system according to the measurement value, and a parameter to be set in the cooling system A controller configured to set in the system, and a database that accumulates the parameters set in the cooling system in the past in association with the measured values, and the parameter determining unit cannot acquire the measured values If one of the parameters stored in the database is And determining the parameter to be set to the stem.

Other problems and solutions to be disclosed by the present application will be clarified by the embodiments of the present invention and the drawings.

When controlling the cooling system according to the measured value, it is possible to continue the control appropriately even when the measured value cannot be obtained.

It is a figure explaining the whole structure of control system. It is a figure explaining the whole structure of control system. 2 is a diagram illustrating a hardware configuration of an integrated management controller 10 and

device controllers

3 and 4. FIG. 3 is a diagram illustrating a software configuration of a device controller 3. FIG. It is a figure which shows the flow of the process which performs low voltage | pressure control. 3 is a diagram illustrating a software configuration of a device controller 4. FIG. It is a figure which shows the flow of the process which performs suitable temperature control. 2 is a diagram showing a software configuration of an integrated management controller 10. FIG. It is a figure which shows the structural example of the database. It is an example of a three-dimensional graph 21 in which the low pressure set value Ps is plotted with the outside temperature as the X axis, the inside temperature as the Y axis, and the time as the Z axis. 3 is a diagram illustrating a configuration example of a setting information storage unit 14. FIG. It is a figure which shows the flow of the accumulation process of the data to the database. It is a figure which shows the flow of the process which sets the low voltage | pressure setting value Ps to the apparatus controller. It is a figure which shows the flow of the determination process of the setting value based on a measured value. It is a figure which shows the flow of the process which determines the low voltage | pressure setting value Ps based on the record memorize | stored in the database. It is an example of a three-dimensional graph 25 in which the low pressure set value Ps is plotted with the outside temperature as the X axis, the inside temperature as the Y axis, and the time as the Z axis. It is an example of the histogram 80 showing the appearance frequency counted for every low voltage | pressure setting value Ps. It is a figure which shows the modification of the control system 1 which added the external database 151. FIG. It is a figure which shows the structural example of the low voltage | pressure setting value memory | storage part 314 in the case of memorize | storing the low voltage | pressure setting value Ps for every time slot | zone. It is a figure which shows the flow of the low voltage | pressure control process in the case of memorize | storing the low voltage | pressure setting value Ps for every time slot | zone. It is a figure which shows the flow of the setting process of the low voltage | pressure setting value Ps in the case of memorize | storing the low voltage | pressure setting value Ps for every time slot | zone.

=== Overall structure ===
Hereinafter, a control system 1 including a cooling system control device according to an embodiment of the present invention will be described. The control system 1 according to the present embodiment is for adjusting the internal temperature of the cooling showcases 60 and 70 installed in the store 2.

1 and 2 are diagrams for explaining the overall configuration of the control system 1. The control system 1 includes a cooling system 5 installed in the store 2 and an integrated management controller 10 (cooling system control device) for controlling the cooling system 5.

Each component constituting the cooling system 5 can be roughly divided into a cooling facility for cooling (freezing or refrigeration) the showcases 60 and 70 and a control facility for controlling the cooling facility. The cooling equipment includes, for example, compressors (compressors) 30 and 40, condensers (condensers) 50,

expansion valves

61 and 71, evaporators (evaporators) 62 and 72, and refrigerant piping 8 that connects them to each other. The The

compressors

30 and 40 and the condenser 50 are collectively referred to as a refrigerator 20. The refrigerator 20 may be configured as a single device, or may be configured such that the

compressors

30 and 40 and the condenser 50 are installed in physically separated locations.

The control equipment for controlling the two

compressors

30 and 40 and the condenser 50 includes, for example,

temperature sensors

31, 38 and 41,

current sensors

32 and 42, and

pressure sensors

39 and 40 installed in the

compressors

30 and 40. 49, a sensor group of the pressure sensor 59 installed in the condenser 50, and the device controller 3.

Temperature sensors 31 and 41 are installed so as to measure the discharge temperatures Td3 and Td4 of the refrigerant gas discharged from the

compressors

30 and 40, respectively.

Current sensors

32 and 42 are installed to measure currents I3 and I4 of

compressors

30 and 40, respectively. The temperature sensor 38 and the pressure sensor 39 are installed so as to measure the suction temperature Ti and the suction pressure Pi of the refrigerant gas sucked into the

compressors

30 and 40, respectively. The pressure sensor 49 is installed so as to measure the discharge pressure Pd of the refrigerant gas discharged from both the

compressors

30 and 40.

The measured values of these sensor groups are input to the device controller 3, and switch signals S1 and S2 indicating the open / closed state of a hydraulic pressure protection switch (not shown) are input from the

compressors

30 and 40, respectively. Relay signals R1 and R2 are input from the device controller 3 to the

compressors

30 and 40, respectively. The device controller 3 outputs the relay signals R1 and R2 based on the measured values of the connected sensor group and the switch signals S1 and S2 from the

compressors

30 and 40, thereby improving the compression capacity of the

compressors

30 and 40. Control. The device controller 3 operates with a predetermined target pressure (hereinafter referred to as “low pressure set value Ps”) as an operation parameter. The device controller 3 controls the

compressors

30 and 40 so that the suction pressure Pi measured by the pressure sensor 39 is maintained at a constant low pressure set value Ps. This control is called “low pressure control”.

The

compressors

30 and 40 are operated or stopped by a relay (not shown) being controlled to open and close by relay signals R1 and R2, respectively. By controlling the overall compression capacity by a combination of operation and stop of a plurality of compressors, the refrigerant gas in the low temperature and low pressure state supplied from the evaporators 62 and 72 through the refrigerant pipe 8 is appropriately compressed, Set to high temperature and pressure.

The pressure sensor 59 is installed so as to measure the pressure P5 of the refrigerant gas in the condenser 50. A measured value of the pressure P5 is input to the device controller 3. The condenser 50 includes three fans 51 to 53, and control signals F1 to F3 are input from the device controller 3 to the fans 51 to 53, respectively. The device controller 3 outputs control signals F1 to F3 based on the measured value of the pressure P5. The condenser 50 controls the rotation of the fans 51 to 53 by control signals F1 to F3, respectively, cools the refrigerant gas supplied from the

compressors

30 and 40 through the refrigerant pipe 8, and condenses them into a liquid state.

Since the discharge pressure Pd of the

compressors

30 and 40 and the pressure P5 of the condenser 50 are substantially equal, either the

pressure sensor

49 or 59 may be used.

The showcase 60 includes an expansion valve 61 and an evaporator 62. Similarly, the showcase 70 includes an expansion valve 71 and an evaporator 72. The refrigerant pipe 8 is filled with a refrigerant such as ammonia or fluorocarbon. The

showcases

60 and 70 are cooled by the evaporators 62 and 72 vaporizing (evaporating) the refrigerant liquid. The control facility for controlling these cooling facilities includes, for example,

temperature sensors

68 and 78, temperature sensors 69 and 79, and the device controller 4.

Temperature sensors 69 and 79 are installed so as to measure the internal temperatures T6 and T7 of the

showcases

60 and 70, respectively. The

temperature sensors

68 and 78 are installed so as to measure temperatures (hereinafter referred to as “in-store temperatures”) T8 and T9 of the environment where the

showcases

60 and 70 are installed, respectively. Only either the

temperature sensor

68 or 78 may be installed. The device controller 4 receives the measured values of temperatures T6 to T9. Control signals V1 and V2 are input from the device controller 4 to the

expansion valves

61 and 71, respectively. The equipment controller 4 controls the

expansion valves

61 and 71 by outputting control signals V1 and V2 based on the measured values of the internal temperatures T6 and T7. The device controller 4 operates with a predetermined target temperature (hereinafter referred to as “appropriate temperature Ts”) as an operation parameter. The equipment controller 4 controls the

expansion valves

61 and 71 so that the inside temperatures T6 and T7 measured by the temperature sensors 69 and 79 are held at the appropriate temperature Ts. This control is called “appropriate temperature control”.

The

expansion valves

61 and 71 are controlled to open and close by control signals V1 and V2, respectively, to reduce the pressure of the refrigerant liquid supplied from the condenser 50 through the refrigerant pipe 8 and lower the boiling point. The evaporators 62 and 72 vaporize the refrigerant liquid having the lowered boiling point.

The temperature sensor 7 is installed outside the store 2 so as to measure the outside temperature To, and the integrated management controller 10 receives the measured value of the outside temperature To from the temperature sensor 7 via the communication line 93.
The integrated management controller 10 is also connected to the

device controllers

3 and 5 via the communication line 91, and communicates with and manages the

device controllers

3 and 5 via the communication line 91, and the state of the devices to be controlled is controlled. Monitor.
The integrated management controller 10 is further connected to a communication network 92, communicated with the remote management controller 6 and the like via the communication network 92, is remotely controlled, and is remotely monitored. The communication lines 91 and 93 perform communication according to standards such as RS232C, RS485, and Ethernet (registered trademark), for example.

The integrated management controller 10 controls the

device controllers

3 and 4. In the present embodiment, a value for determining the state of the cooling system 5 (hereinafter simply referred to as “measured value”) such as a measured value by the sensor group and an open / closed state of the switch is acquired, and according to the acquired measured value. The cooling system 5 is controlled by evaluating the cooling state of the showcase, determining the low pressure set value Ps to realize energy saving in accordance with this, and setting the determined low pressure set value Ps in the device controller 3. In addition, the integrated management controller 10 accumulates the measurement values of each sensor so that the low-pressure set value Ps of the device controller 3 can be set based on the history even when the measurement value cannot be acquired from the sensor. ing.

=== Hardware configuration ===
FIG. 3 is a diagram illustrating a hardware configuration of the integrated management controller 10 and the

device controllers

3 and 4.

The integrated management controller 10 includes a main control unit 101, a RAM (Random Access Memory) 102, a storage device 103, a communication control unit 104, and an external input / output interface 105. The RAM 102 is a volatile memory, and the storage device 103 is a nonvolatile memory. The storage device 103 stores various data and programs. The storage device 103 is, for example, a flash memory or a hard disk drive. The storage device 103 stores at least the control program 11.

The main control unit 101 is a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) that controls the operation of the integrated management controller 10. Various functions are realized by the main control unit 101 reading out the program stored in the storage device 103 to the RAM 102 and executing the program. The communication control unit 104 performs processing for communicating with the remote management controller 6 and the

device controllers

3 and 4. The communication control unit 104 includes, for example, a communication interface circuit for performing serial communication in accordance with standards such as RS232C and RS485, an adapter for connecting to Ethernet (registered trademark), a wireless communication device for performing wireless communication, a telephone For example, a modem for connecting to a network. The external input / output interface 105 is an interface for connecting an input device such as a keyboard and a mouse, an output device such as a display, a printer, and a speaker. The integrated management controller 10 receives input of data from the user via the external input / output interface 105, and displays and prints data to the user.

The device controller 3 includes a processing device 301, a RAM 302, a flash memory 303, a communication control unit 304, and an input / output interface 305. The device controller 4 includes a processing device 401, a RAM 402, a flash memory 403, a communication control unit 404, and an input / output interface 405. Since the device controller 4 has the same configuration as the device controller 3, only the device controller 3 will be described with respect to common parts.

The RAM 302 is a volatile memory, and the flash memory 303 is a nonvolatile memory. The flash memory 303 stores various programs and data. A storage device such as a hard disk drive may be employed instead of the flash memory 303. The flash memory 303 stores at least a control program 33 and a low pressure set value Ps34. The flash memory 403 of the device controller 4 stores at least a control program 43 and an appropriate temperature Ts44. A predetermined default value that is considered appropriate by the user is recorded in advance in the flash memory 303 as a low pressure set value Ps, and a predetermined default value is recorded in advance in the flash memory 403 as an appropriate temperature Ts. It is assumed that

The processing device 301 is a processor such as a CPU or MPU that controls the operation of the device controller 3. Various functions are realized by the processing device 301 reading the program stored in the flash memory 303 to the RAM 302 and executing the program. The communication control unit 304 performs communication with the integrated management controller 10. The communication control unit 304 includes, for example, a communication interface circuit for performing serial communication according to a standard such as RS232C and RS485, an adapter for connecting to Ethernet (registered trademark), a wireless communication device for performing wireless communication, a telephone For example, a modem for connecting to a network. The input / output interface 305 receives data from an input device such as a switch, button, or keyboard, and outputs the data to a display, a printer, or the like.

== Software Configuration of Device Controller 3 ==
FIG. 4 is a diagram illustrating a software configuration of the device controller 3. The device controller 3 includes a low pressure set value management unit 311, a measurement value providing unit 312, a low pressure control unit 313, and a low pressure set value storage unit 314. The low pressure set value management unit 311, the measurement value providing unit 312, and the low pressure control unit 313 are realized by the processing device 301 of the device controller 3 reading out the control program 33 stored in the flash memory 303 to the RAM 302 and executing it. The low pressure set value storage unit 314 is realized as a part of a storage area provided by the flash memory 303. Note that the low pressure set value storage unit 313 may be realized as a part of the storage area of the RAM 302.

The low pressure set value storage unit 314 stores the low pressure set value Ps. The low pressure set value management unit 311 receives the low pressure set value Ps transmitted from the integrated management controller 10, and registers the received low pressure set value Ps in the low pressure set value storage unit 314.

The measurement value providing unit 312 provides various measurement values input to the device controller 3 to the integrated management controller 10. In the present embodiment, the measurement value providing unit 312 receives a command for acquiring a measurement value (hereinafter simply referred to as “acquisition command”) transmitted from the integrated management controller 10, and according to the acquisition command, Low pressure set value Ps stored in low pressure set value storage unit 314, refrigerant gas discharge temperatures Td3 and Td4 input from temperature sensors 31 and 41, currents I3 and I4 input from

current sensors

32 and 42, temperature sensor 38, the refrigerant gas suction temperature Ti and the suction pressure Pi, the discharge pressure Pd input from the pressure sensor 49, and the refrigerant gas pressure P5 input from the pressure sensor 59 are transmitted to the integrated management controller 10. To do.

The low pressure control unit 313 performs low pressure control. FIG. 5 is a diagram showing a flow of processing for performing low-pressure control. When the suction pressure Pi falls below the low pressure set value Ps (S321: YES), the low pressure control unit 313 outputs a relay signal R1 or R2 so as to reduce the compression capacity of the compressor 30 or 40 (S322), and the suction pressure When Pi exceeds the low pressure set value Ps (S323: YES), relay signals R1 and R2 are output so as to increase the compression capacity of the compressors 30 and 40 (S324). Thus, the

compressors

30 and 40 are controlled so that the suction pressure Pi is maintained near the low pressure set value Ps.

== Software Configuration of Device Controller 4 ==
FIG. 6 is a diagram illustrating a software configuration of the device controller 4. The device controller 4 includes an appropriate temperature management unit 411, a measurement value providing unit 412, an appropriate temperature control unit 413, and an appropriate temperature storage unit 414. The appropriate temperature management unit 411, the measurement value providing unit 412 and the appropriate temperature control unit 413 are realized by the processing device 401 of the device controller 4 reading out the control program 43 stored in the flash memory 403 to the RAM 402 and executing it. The appropriate temperature storage unit 414 is realized as a part of the storage area provided by the flash memory 403. The appropriate temperature storage unit 414 may be realized as a part of the storage area of the RAM 402.

The appropriate temperature storage unit 414 stores the appropriate temperature Ts. In general, the set temperature of the showcase can be set on the showcase side, and in this embodiment as well, it is assumed that the appropriate temperature Ts input by the user is stored in the appropriate temperature storage unit 414 in advance. When the appropriate temperature management unit 411 receives the appropriate temperature Ts from the integrated management controller 10, the appropriate temperature management unit 411 may register the received appropriate temperature Ts in the appropriate temperature storage unit 414.

The measurement value providing unit 412 provides various measurement values input to the device controller 4 to the integrated management controller 10. In the present embodiment, the measurement value providing unit 412 receives the acquisition command transmitted from the integrated management controller 10, and, according to the acquisition command, the appropriate temperature Ts, the temperature sensor 69, and the temperature sensor 69 that are stored in the appropriate temperature storage unit 414. The in-store temperatures T6 and T7 input from 79 and the in-store temperatures T8 and T9 input from the

temperature sensors

68 and 78 are transmitted to the integrated management controller 10. Note that only one of the in-store temperatures T8 and T9 or an average value of the in-store temperatures T8 and T9 may be transmitted to the integrated management controller 10 as the in-store temperature.

The optimal temperature control unit 413 performs optimal temperature control. FIG. 7 is a diagram showing a flow of processing for performing appropriate temperature control. The appropriate temperature control unit 413 performs the following processing for each

showcase

60 and 70. In other words, the appropriate temperature control unit 413 adds a predetermined value to the appropriate temperature Ts to obtain an upper limit value (S421), and when the internal temperature T6 or T7 exceeds the upper limit temperature (S422: YES), expansion is performed according to the exceeded temperature. Control signals V1 and V2 are output so that the opening degree of the

valve

61 or 71 is increased (S423). When the internal temperature does not exceed the upper limit value (S422: NO), the appropriate temperature control unit 413 subtracts a predetermined value from the appropriate temperature Ts as the lower limit value (S424), and the internal temperature T6 or T7 is the lower limit temperature. (S425: YES), the control signals V1 and V2 are output so that the opening degree of the

expansion valve

61 or 71 is reduced in accordance with the lower temperature (S426). The predetermined value may be different depending on the

showcases

60 and 70, or may be the same value for all the showcases.

By performing the above processing for each of the

showcases

60 and 70, the

expansion valves

61 and 71 are controlled so that the inside temperatures T6 and T7 are maintained near the appropriate temperature Ts.

== Software configuration of the integrated management controller 10 ==
FIG. 8 is a diagram illustrating a software configuration of the integrated management controller 10. The integrated management controller 10 includes a measurement value acquisition unit 111, a low pressure set value determination unit 112, a control unit 113, a database 13, and a setting information storage unit 14. The measurement value acquisition unit 111, the low-pressure set value determination unit 112, and the control unit 113 are realized by the main control unit 101 of the integrated management controller 10 reading the control program 11 stored in the storage device 103 into the RAM 102 and executing it. The database 13 and the setting information storage unit 14 are realized as storage areas provided by the RAM 102 and the storage device 103.

Measured value acquisition unit 111 acquires various measured values every predetermined time (in this embodiment, 5 minutes). In the present embodiment, the measurement value acquisition unit 111 receives from the device controller 3 the low pressure set value Ps set in the device controller 3, the refrigerant gas discharge temperatures Td3 and Td4 measured by the temperature sensors 31 and 41, and the current sensor 32. Currents I3 and I4 measured by

pressure sensors

42 and 42, suction temperature Ti and suction pressure Pi of refrigerant gas measured by temperature sensor 38 and pressure sensor 39, discharge pressure Pd of refrigerant gas measured by pressure sensor 49, and pressure sensor 59 The pressure P5 of the refrigerant gas is acquired, the appropriate temperature Ts set in the device controller 4 from the device controller 4, the in-store temperatures T8 and T9 measured by the

temperature sensors

68 and 78, and the interior measured by the temperature sensors 69 and 79 The temperatures T6 and T7 are acquired, and the outside temperature To is acquired from the temperature sensor 7. Acquisition of the measurement values from the

device controllers

3 and 4 is performed by transmitting an acquisition command from the measurement value acquisition unit 111 to the

device controllers

3 and 4 via the

communication lines

91 and 93. It is assumed that the measurement value is transmitted from 4. The measurement value from the temperature sensor 7 is acquired by a method of acquiring a value from a general sensor. For example, an analog sensor signal output from the temperature sensor 7 is acquired as a digital value by an AD converter. To be able to. A controller (outside store temperature sensor controller) connected to the temperature sensor 7 is installed, and the measurement value acquisition unit 111 transmits an acquisition command to the outside store temperature sensor controller in the same manner as the

device controllers

3 and 4. The temperature sensor controller may transmit the measurement value from the temperature sensor 7 to the integrated management controller 10 in response to the acquisition command. Further, the measurement values may be periodically transmitted from the

device controllers

3 and 4 to the integrated management controller 10, and an outside temperature sensor controller connected to the temperature sensor 7 is installed, and the outside temperature sensor controller periodically Specifically, the measurement value may be transmitted to the integrated management controller 10.

The low pressure set value determination unit 112 determines the low pressure set value Ps to be set in the device controller 3. As will be described later, the low pressure set value determination unit 112 determines whether the cooling state of the

showcases

60 and 70 is good or not according to the average value of the temperature difference between the appropriate temperature Ts and the internal temperature, and when the cooling state is good. Increases the low pressure set value Ps, and lowers the low pressure set value Ps when the cooling state is not good. When the measured value acquisition unit 111 cannot acquire the internal temperature T6 and T7 or the outside temperature To from the sensor, the low pressure set value determination unit 112 stores the past low pressure set value Ps accumulated in the database 13. The low pressure set value Ps to be set is determined according to.

The control unit 113 controls the

device controllers

3 and 4. The control unit 113 performs various types of control related to the operations of the

device controllers

3 and 4. In the present embodiment, only the low pressure control for setting the low pressure set value Ps determined by the low pressure set value determination unit 112 in the device controller 3 will be described. To do. In the present embodiment, when the control unit 113 transmits the low pressure set value Ps to the device controller 3, the received low pressure set value Ps is stored in the flash memory 303 on the device controller 3 side.

The database 13 accumulates the low pressure set value Ps set in the device controller 3 in association with the measured value. FIG. 9 is a diagram illustrating a configuration example of the database 13. Each record recorded in the database 13 includes a value specifying a showcase (hereinafter referred to as “showcase number”), date and time, time zone, internal temperature, in-store temperature, in-store rounding temperature, in-store temperature, in-store temperature, store The outer rounding temperature, the appropriate temperature Ts, and the low pressure set value Ps are included. The time zone is a time zone to which the time included in the date and time belongs. In the present embodiment, the length of the time zone is 2 hours. Therefore, any value of 0, 2, 4,..., 22 is set in the time zone. The in-store rounding temperature is a value obtained by rounding the in-store temperature by a predetermined rounding width (in this embodiment, 5 ° C., but can be an arbitrary value). A value rounded by a predetermined rounding width. For the rounding calculation, any calculation method such as rounding down, rounding up, and rounding off can be used. The in-store temperature and the outside temperature may be rounded with different rounding widths. In addition to these, the record includes, for example, currents I3 and I4 measured by the

current sensors

32 and 42, a suction temperature Ti and a suction pressure Pi measured by the temperature sensor 38 and the pressure sensor 39, and a pressure sensor 49. Various records acquired by the

device controllers

3 and 4 such as the discharge pressure Pd to be performed, the switch signals S1 and S2 acquired from the

compressors

30 and 40, and the pressure P5 measured by the pressure sensor 59 are included in the record. Also good. In addition to the temperature sensor 7, various sensors may be installed inside and outside the store 2, and the measurement value acquired by the sensor may be included in the record.

In the process described later, the history of the low-pressure set value Ps is managed in association with the outside temperature rounding value, the inside temperature rounding value, and the time zone. Therefore, as shown in FIG. 10, when the low pressure set value Ps is plotted on a three-dimensional graph 21 in which the outside temperature is the X axis, the in-store temperature is the Y axis, and the time is the Z axis, the X axis and the Y axis are each 5 The low pressure set value Ps is included in each cell divided by degrees Celsius and time divided by 2 hours. For example, in the example of FIG. 9, the low pressure set value Ps related to the record having the showcase number “1” and the date and time “2010/06/01 00:00:00” is the cell 22 in the graph 21 of FIG. include.

The setting information storage unit 14 stores various setting information. FIG. 11 is a diagram illustrating a configuration example of the setting information storage unit 14. In the present embodiment, the setting information storage unit 14 stores an energy saving mode, an analysis period, a temperature difference allowable value, an adjustment value, and a low pressure setting lower limit value. The energy saving mode is any one of “energy saving priority mode”, “safety priority mode”, and “safe absolute mode”. As will be described later, the low pressure set value determination unit 112 acquires the measured value from the sensor according to the energy saving mode. If it is not possible, the low pressure set value Ps to be newly set is calculated by a different calculation method. The analysis period is a value that specifies the range of records to be analyzed. The temperature difference allowable value is a value for determining the quality of the cooling state of the

showcases

60 and 70, and when the difference between the internal temperature and the appropriate temperature Ts exceeds the temperature difference allowable value, the showcase 60 and It is determined that the cooling state at 70 is poor (overcooling or insufficient cooling). The adjustment value is a step value for increasing or decreasing the low pressure set value Ps when the low pressure set value Ps is adjusted. The low pressure setting lower limit value is the lowest value that can be set as the low pressure setting value Ps.

== Cumulative processing ==
FIG. 12 is a diagram showing a flow of data accumulation processing to the database 13 in the integrated management controller 10.
The measured value acquisition unit 111 sets the variable error count to 0 (S501), sets the communication abnormality flag to false (S502), and performs initialization processing. The measurement value acquisition unit 111 transmits an acquisition command to the

device controllers

3 and 4 and the temperature sensor 7 (S503). From the

device controller

3 or 4 or the temperature sensor 7, the internal temperature, the in-store temperature, the outside temperature, and the appropriate temperature If either of Ts and low pressure set value Ps cannot be received (S504: NO), the error count is incremented (S505). If the error count exceeds a predetermined threshold (S506: YES), a communication abnormality flag Is set to true (S507).
On the other hand, when all of the inside temperature, the inside temperature, the outside temperature, the appropriate temperature Ts, and the low pressure set value Ps are received (S504: YES), the measured value acquisition unit 111 sets the error count to 0 (S508). ), The communication abnormality flag is set to false (S509). The measurement value acquisition unit 111 acquires the current date and time (S510), the showcase number, the current date and time, the time zone to which the current date and time belongs, the in-store temperature, the in-store temperature, the in-store rounding temperature obtained by rounding the in-store temperature by 5 ° C., A record in which the store outside temperature, the store outside rounding temperature obtained by rounding the store outside temperature by 5 ° C., the appropriate temperature Ts, and the low pressure set value Ps is added to the database 13 (S511).
If there is no end instruction (S512: NO), measurement value acquisition unit 111 repeats the processing from step S503. Note that the measurement value acquisition unit 111 performs standby processing so that the processing from step S503 is repeated every five minutes.

As described above, the measured value acquisition unit 111 accumulates the in-store temperature, the outside temperature, the appropriate temperature Ts, the low pressure set value Ps, and the like acquired from the

device controllers

3 and 4 and the temperature sensor 7 in the database 13.

== Low pressure control setting process ==
FIG. 13 is a diagram showing a flow of processing for setting the low pressure set value Ps.
First, the low pressure set value determination unit 112 acquires the current time (S521). The current time is obtained by a general method. For example, the current time can be acquired from a clock provided in the integrated management controller 10. Subsequently, the following processing is performed for each of the

showcases

60 and 70.
When the communication abnormality flag is false (S522: NO), the low-pressure set value determination unit 112 determines the low-pressure set value Ps (which should be set based on the measured values acquired from the

device controllers

3 and 4 and the temperature sensor 7). Hereinafter, the setting value is simply determined (S523). If the communication abnormality flag is true (S522: YES), the setting value is determined based on the data accumulated in the database 13 (S524). ). The setting value determination process will be described later. The control unit 113 sets the setting value determined by the low pressure setting value determination unit 112 in the device controller 3 (S525).

After the above processing is repeated for each of the

showcases

60 and 70, if there is no end instruction (S526: NO), the processing from step S521 is repeated. The low-pressure control setting process is repeatedly executed at a predetermined time interval, for example, at a cycle of 1 minute.

== Low pressure set value Ps determination process based on measured value ==
FIG. 14 is a diagram illustrating a flow of a setting value determination process based on a measurement value.
The low pressure set value determination unit 112 reads a record of the latest date and time corresponding to the showcase number indicating the showcase to be processed from the database 13 (S541), and the inside rounding temperature and the store included in the read record. The latest low pressure setting value Ps corresponding to the outer rounding temperature and the time zone to which the current time belongs is read from the database 13 (S542). The low-pressure set value determination unit 112 reads a record that corresponds to the showcase number and is a date and time within the past analysis period from the current time from the database 13 (S543), and for each of the read records, the temperature from the internal temperature to the appropriate temperature A temperature difference obtained by subtracting Ts is calculated, and an average value of the calculated temperature differences is obtained as an average temperature difference (S544). Alternatively, the temperature difference between the current internal temperature and the appropriate temperature Ts may be replaced with an average temperature difference, regardless of past records.

If the absolute value of the average temperature difference is less than the temperature difference allowable value (S545: YES), the low pressure set value determination unit 112 sets the low pressure set value Ps as the set value (S546), and the absolute value of the average temperature difference is the temperature difference. When larger than the allowable value (S545: NO), when the average temperature difference is a positive value, that is, when the internal temperature is higher than the appropriate temperature Ts and the cooling is insufficient (S547: YES), The adjustment value is subtracted from the low pressure set value Ps read out in step S542 to obtain a set value (S548). On the other hand, when the absolute value of the average temperature difference is larger than the allowable temperature difference (S545: NO), when the average temperature difference is a negative value, that is, the internal temperature is lower than the appropriate temperature Ts. When it is in a cooling state (S546: NO), the low pressure set value determination unit 112 adds the adjustment value to the low pressure set value Ps to obtain a set value (S548).

As described above, when the average temperature difference is less than the temperature difference allowable value, that is, when the cooling state of the showcase is good, the low pressure set value Ps set in the device controller 3 is not changed, and the show When the cooling state of the case is a supercooling state, a value higher than the current low pressure set value Ps by the adjustment value is set in the device controller 3 in step S525 of FIG. 13, and the cooling state of the showcase is the cooling state. If the state is insufficient, a value lower than the current low pressure set value Ps by the adjustment value is set in the device controller 3. As a result, when the showcase is in a supercooled state, the equipment controller 3 performs control so that the

compressors

30 and 40 do not compress much, so that the compression capacities of the

compressors

30 and 40 are reduced. It is suppressed and energy saving is realized. Therefore, it is possible to control the cooling system 5 so as to save energy as much as possible while improving the cooling state of the showcase.

On the other hand, when the average temperature difference exceeds the allowable temperature difference value, that is, when the cooling state of the showcase is not good, a value lower than the current low pressure set value Ps by the adjustment value is set in the device controller 3. Will be. As a result, the cooling capacity of the

compressors

30 and 40 is increased, and the cooling state can be improved.

== Low pressure set value Ps determination process based on database ==
FIG. 15 is a diagram illustrating a flow of processing for determining the low pressure set value Ps based on the records stored in the database 13.
The low-pressure set value determination unit 112 reads, from the database 13, a record whose date corresponds to the time zone to which the current time belongs and is within the past analysis period from the current time (S561). As shown in FIG. 16, in the three-dimensional graph 25 with the store outside temperature, the store temperature, and the time as the X axis, Y axis, and Z axis, respectively, it corresponds to the low pressure set value Ps included in the cell group indicated by the hatched portion 26. Record to be read.
The low pressure set value determination unit 112 counts the appearance frequency for each low pressure set value Ps (S562). FIG. 17 is a histogram 80 showing the appearance frequency counted for each low pressure set value Ps.

When the energy saving mode set in the setting information storage unit 14 is the “energy saving priority mode” (S563: YES), the low pressure set value determining unit 112 sets the low pressure set value Ps having the highest appearance frequency as the set value ( S564). In the example of FIG. 17, the low pressure set value 81 having the highest appearance frequency is determined as the set value.
When the energy saving mode is the “safety priority mode” (S565: YES), the low pressure set value determination unit 112 determines the lowest value among the appeared low pressure set values Ps as the set value (S566). In the example of FIG. 17, the lowest low pressure set value 82 among those whose appearance frequency is not 0 is determined as the set value.
When the energy saving mode is the “safe absolute mode” (S565: NO), the low pressure setting lower limit value is determined as the setting value (S567). In the example of FIG. 17, the low pressure setting lower limit value is determined as the set value regardless of the appearance frequency.

As described above, in the control system 1 of the present embodiment, the

device controllers

3 and 5 control each device to be controlled, and the integrated management controller 10 and the remote management controller 6 control and monitor each device controller. The temperatures of the

showcases

60 and 70 can be adjusted efficiently by linking each device.

In addition, as described above, the integrated management controller 10 of this embodiment is set in the device controller 3 according to the measurement value acquisition unit 111 that acquires the measurement value for evaluating the environment of the cooling system 5 and the measurement value. A low pressure set value determining unit 112 that determines a low pressure set value Ps to be set, a control unit 113 that sets a low pressure set value Ps to be set in the device controller 3, and a low pressure set value Ps set in the past. And the database 13 that accumulates in association with the in-store temperature and the outside temperature, and the low-pressure set value determination unit 112 stores the low-pressure set value stored in the database 13 when the measured value cannot be acquired. One of Ps can be determined as the low pressure set value Ps to be set in the device controller 3 according to the appearance frequency. Therefore, even if the integrated controller 10 cannot acquire measurement values or setting values from the

device controllers

3 and 4 and the temperature sensor 7, the integrated management controller 10 supplies the device controller 3 to the device controller 3 based on the past records accumulated in the database 13. The setting of the low pressure set value Ps can be continued.

In the control system 1 of the present embodiment, as long as the cooling state of the showcase is subcooled, the low pressure set value Ps is controlled to be increased to save energy, and if the cooling state is not good, the low pressure set value Ps is decreased. Therefore, while the operation is continued, the low pressure set value Ps approaches the optimum value that provides a good cooling state and energy saving. Therefore, when the integrated management controller 10 periodically acquires the low pressure set value Ps set in the device controller 3 and adds it to the database 10, many low pressure set values Ps close to the optimum value are accumulated. become. Therefore, even if the measured value cannot be obtained, the set value can be determined from the low pressure set value Ps stored in the database 13 according to the appearance frequency and set in the device controller 3. And it becomes possible to set the low pressure set value Ps in consideration of energy saving in the device controller 3.

In addition, the measurement value acquisition unit 111 of the integrated management controller 10 of the present embodiment acquires at least the in-store temperature and the out-store temperature measured by the sensor that measures the in-store temperature and the out-store temperature as measured values. Therefore, the environment of the cooling system 5 can be evaluated with reference to not only the temperature inside the store where the showcase is set but also the temperature outside the store (outside temperature). The outside temperature also affects the temperature of the building of the store and the temperature inside the store, and also affects the temperature inside the showcase. Evaluation can be made.

Further, in the integrated management controller 10 of the present embodiment, the low pressure set value determining unit 112, when the measured value cannot be acquired, is the low pressure set value Ps having the highest appearance frequency in the energy saving mode of the “energy saving priority mode”. In the energy saving mode of the “safety priority mode”, the lowest value among the low pressure set values Ps appearing in the database 13, that is, the value with the highest cooling capacity among the past operation results of the cooling system 5, “ In the energy saving mode “safe absolute mode”, the low pressure setting lower limit value for operating the cooling system 5 with the maximum cooling capacity can be determined as a parameter to be set in the device controller 3.

Here, when the energy saving mode is the “energy saving priority mode”, the low pressure set value Ps close to the optimum value can be set in the device controller 3 by adopting the low pressure set value Ps having a high frequency of appearance in the past. it can. Thereby, even if it is a case where a measured value cannot be acquired, the cooling system 5 can be controlled to implement | achieve energy saving.

When the energy saving mode is the “safety priority mode”, the lowest low pressure set value Ps that has appeared in the past is adopted, so that the lowest low pressure set value Ps is set in the past and the cooling capacity is increased most. It is possible to cause the

compressors

30 and 40 to perform the same operation as that of the time. There are various factors that should increase the cooling capacity, such as an increase in the outside air temperature, display of uncooled products in the showcase, and an increase in store visitors. By operating the

compressors

30 and 40 in the same state as when the cooling capacity is increased, it is possible to reduce the possibility that the cooling state in the showcase is deteriorated, and to prevent the cooling system 5 from being increased more than necessary. Can be controlled.

When the energy saving mode is the “safe absolute mode”, the lowest value that can be set as the low pressure set value Ps is set in the device controller 3, so that the cooling capacity in the cooling system 5 can be maximized. it can. Therefore, for example, in a showcase of a frozen product that is not allowed to be thawed, control can be performed so that the frozen product is not thawed.

In this way, it is possible to finely set the operation to be performed when the measured value cannot be acquired as the energy saving mode.

Further, in the integrated management controller 10 of the present embodiment, the database 13 accumulates the low pressure set value Ps in association with the time zone, the in-store temperature, and the outside temperature, and the low pressure set value determination unit 112 can acquire the measurement value. If not, one of the low pressure set values Ps corresponding to the time zone including the current time can be determined as the low pressure set value Ps to be set in the device controller 3 according to the appearance frequency.

As mentioned above, although this embodiment was described, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

For example, in the above-described embodiment, the cooling system 5 is controlled by setting the low pressure set value Ps in the device controller 3 by the integrated management controller 10. The function of the controller 10 may be provided to determine the low pressure set value Ps set by the device controller 3 itself.

In the present embodiment, the device controller 3 controls the

compressors

30 and 40 and the condenser 50, and the device controller 4 controls the

expansion valves

61 and 71 and the evaporators (evaporators) 62 and 72. However, one device controller 3 may control all of them. Moreover, you may make it control the

compressors

30 and 40 and the condenser 50 from a different apparatus controller. In the present embodiment, the integrated management controller 10 controls the

device controllers

3 and 5 to set the low pressure set value Ps. However, the device controller 3 includes the functions of the integrated management controller 10. The device controller 3 itself may determine the low pressure set value Ps.

In the present embodiment, when the measurement value cannot be acquired, the past low pressure setting value Ps corresponding to the time zone including the current time is read. One of the low pressure set values Ps corresponding to the date and time belonging to the included month or season may be determined as the low pressure set value Ps to be set in the device controller 3 according to the appearance frequency. Further, one of the low pressure set values Ps corresponding to the month or season in which the current time is included and also corresponding to the current time zone is determined as the low pressure set value Ps to be set in the device controller 3 according to the appearance frequency. You may make it do. It is assumed that the environmental conditions that can affect the cooling state of the showcase, such as the temperature outside the store, will be similar for each month and season, so measurements cannot be obtained and the environment can be evaluated. Even if not, by performing the low pressure control using the past low pressure set value Ps corresponding to the month or season, the low pressure set value Ps actually set in the environment similar to the current environment is used. There is a high possibility that control can be performed. Therefore, even when a measured value cannot be acquired, the possibility of realizing energy saving while maintaining a good cooling state can be increased.

In the present embodiment, the history of the past low-pressure set value Ps is accumulated in the database 13, but not limited to this, for example, an accumulation period (for example, 24 hours, 1 week, 1 month, 3 (Any length such as one month or one year) may be stored in the setting information storage unit 14 and only the history for the accumulation period may be accumulated. In this case, in the accumulation process of FIG. 12, records before the date and time before the accumulation period from the current date and time can be deleted from the database 13. Alternatively, the integrated management controller 10 may save data outside the accumulation period in the external database 151 as shown in FIG. In this case, in the integrated management controller 10, the database 13 stores the low-pressure set value Ps set in the device controller 3 within a predetermined accumulation period in association with the time, the in-store temperature, and the outside temperature, and obtains the measured value. Each time the accumulation period ends, the unit 111 saves the record stored in the database 13 to the database 151, deletes the record from the database 13, and the low-pressure set value determination unit 112 sets the set value shown in FIG. In the determination process, one of the low pressure set values Ps stored in the database 13 and the database 151 is set in the device controller 3 in accordance with the appearance frequency, after the current time and before the cumulative period. The low pressure set value Ps to be determined can be determined. Alternatively, a save period shorter than the accumulation period may be provided, and every time the accumulation period ends, records from the date and time of the oldest record to the date and time after the save period may be saved in the database 151. As a result, the amount of data that is always managed by the integrated management controller 10 can be kept below a certain amount. The accumulation period and the analysis period may be the same value or different values.

In the present embodiment, only one low pressure set value Ps is stored in the low pressure set value storage unit 314 of the device controller 3, but the low pressure set value Ps for each time zone may be stored. Good. A configuration example of the low pressure set value storage unit 314 in this case is shown in FIG. The low pressure set value storage unit 314 stores the low pressure set value Ps in association with the time zone. Moreover, the flow of the low-pressure control process in this case is shown in FIG. The low-pressure control process shown in FIG. 20 is a modification of the process shown in FIG. As shown in FIG. 20, the low-pressure control unit 313 first acquires the current time (S341). The current time can be acquired by, for example, a clock. The low pressure control unit 313 reads the low pressure set value Ps corresponding to the time zone to which the current time belongs from the low pressure set value storage unit 314 (S342). Thereafter, the low-pressure control unit 313 executes steps S321 to S324 in the same manner as the above-described process of FIG. On the other hand, the integrated management controller 10 transmits the low pressure set value Ps for each time zone to the device controller 3 in the setting process of the low pressure set value Ps shown in FIG. In this case, as shown in FIG. 21, after the processing of steps S523 and S524 in FIG. 13, the low pressure setting value determination unit 112 sets the setting value calculated in step S523 or S524 for the time zone to which the current time belongs. As a value (S601), the low pressure set value Ps shown in FIG. 15 is determined for each time zone other than the time zone to which the current time belongs (S602). Note that in step S561 in FIG. 15, a record corresponding to the time zone within the past analysis period is read from the start time of the time zone subject to processing, corresponding to the time zone to be processed. In addition, the control unit 113 transmits the low pressure set value Ps for each time zone to the device controller 3 (S525). In this way, the device controller 3 stores the low pressure set value Ps for each time zone, and for the current time zone, if the measurement value can be obtained, it is based on the measurement value, and if it cannot be obtained, the database The low pressure set value Ps is determined on the basis of the record accumulated in 13, and the low pressure set value Ps is determined on the basis of the record accumulated in the database 13 for all other time zones. The low pressure set value Ps for each time zone set in is updated. In the device controller 3, since the low pressure control is performed based on the low pressure set value Ps for each time zone, the integrated management controller 10 is activated when the operation of the integrated management controller 10 is stopped or noise is generated in the communication line 91. Even if the low pressure set value Ps does not reach the device controller 3, the device controller 3 can continue the low pressure control using the low pressure set value Ps for each time zone. Further, as described above, as the integrated management controller 10 continues operation, the low pressure set value Ps calculated based on the current measurement value approaches the optimum value, and is accumulated in the database 13. Therefore, the low pressure set value Ps calculated based on the current measured value and the low pressure set value Ps determined according to the appearance frequency from the low pressure set value Ps accumulated in the database 13 are Expected to be close to optimal value. These low-pressure set values Ps are transmitted to the device controller 3 and used for low-pressure control in the device controller 3, so even if the low-pressure set value Ps is not set in the device controller 3 from the integrated management controller 10, the device In the controller 3, the low pressure control can be performed based on the low pressure set value Ps close to the optimum value.

In the present embodiment, the low pressure set value Ps is adjusted based on the measured value, but the appropriate temperature Ts may be adjusted based on the measured value instead of the low pressure set value Ps. Both the set value Ps and the appropriate temperature Ts may be adjusted. In this case, the appropriate temperature Ts is also stored in the database 13 in association with the in-store temperature, the outside temperature, and the time similarly to the low pressure set value Ps described above, and the integrated management controller 10 measures the measured value. If the record of the appropriate temperature Ts corresponding to the time zone to which the current time belongs is read from the database 13 and the appearance frequency is counted for each appropriate temperature Ts, the appearance frequency is determined according to the energy saving mode. Can be determined as the appropriate temperature Ts to be set in the device controller 4. The appropriate temperature Ts having the highest value, the lowest temperature among the appeared appropriate temperatures Ts, and the lowest value that can be set as the appropriate temperature Ts can be determined.

In the present embodiment, when any of the measurement values cannot be acquired, the setting value is determined based on the acquired measurement value and the appearance frequency of the low pressure setting value Ps accumulated in the database 13. May be. In this case, since the acquired measurement value can be taken into consideration, the setting is more compliant with the environmental conditions than when the setting value is determined based only on the appearance frequency of the low pressure setting value Ps accumulated in the database 13. The value can be determined.

DESCRIPTION OF SYMBOLS 1 Control system 2

Store

3, 4 Equipment controller 5 Cooling system 6 Remote management controller 7 Temperature sensor 8 Refrigerant piping 10 Integrated management controller 11 Control program 13 Database 14 Setting information storage part 20

Refrigerator

30, 40 Compressor (compressor)
31, 41

Temperature sensor

32, 42

Current sensor

33, 43 Control program 34 Low pressure set value Ps
44 Appropriate temperature Ts
38

Temperature sensor

39, 49 Pressure sensor 50 Condenser (condenser)
51 to 53 Fan 59

Pressure sensor

60, 70

Showcase

61, 71 Expansion valve 62, 72 Evaporator (evaporator)
68, 78 Temperature sensor 69, 79

Temperature sensor

91, 93 Communication line 92 Communication network 101 Main controller 102 RAM
DESCRIPTION OF SYMBOLS 103 Memory | storage device 104 Communication control part 105 External input / output interface 111 Measurement value acquisition part 112 Low voltage | pressure setting value determination part 113 Control part 301,401 Processing apparatus 302,402 RAM
303, 403

Flash memory

304, 404

Communication control unit

305, 405 Input / output interface 311 Low pressure set value management unit 312 Measurement value providing unit 313 Low pressure control unit 314 Low pressure set value storage unit 411 Appropriate temperature management unit 412 Measurement value providing unit 413 Optimal temperature Control unit 414 Appropriate temperature storage unit

Claims

A control device for controlling the cooling system by setting parameters for the operation of the cooling system in the cooling system;
A measurement value acquisition unit for acquiring a measurement value for evaluating the environment of the cooling system;
A parameter determining unit for determining a parameter to be set in the cooling system according to the measured value;
A control unit for setting parameters to be set in the cooling system in the cooling system;
A database that accumulates the parameters set in the cooling system in the past in association with the measured values;
With
The parameter determination unit, when the measured value could not be acquired, determining one of the parameters stored in the database as a parameter to be set in the cooling system according to the appearance frequency;
Cooling system control device characterized by.
The cooling system control device according to claim 1,
A sensor for measuring a temperature inside the building where the cooling system is installed and a temperature outside the building;
The measurement value acquisition unit acquires at least the temperature inside the building and the temperature outside the building measured by the sensor as the measurement values;
Cooling system control device characterized by.
The cooling system control device according to claim 1,
The parameter determination unit, when the measurement value could not be acquired,
The parameter with the highest appearance frequency, and
Of the parameters accumulated in the database, the cooling system having the highest cooling capacity when set in the cooling system;
A rated value for operating the cooling system with maximum cooling capacity;
Determining as a parameter to be set in the cooling system,
Cooling system control device characterized by.
The cooling system control device according to claim 1,
The database accumulates the parameters in association with time zones and the measured values,
The parameter determination unit determines one of the parameters corresponding to the time zone including the current time as a parameter to be set in the cooling system according to the appearance frequency when the measurement value cannot be acquired. thing,
Cooling system control device characterized by.
The cooling system control device according to claim 1,
The database accumulates the parameters in association with date and time and the measured value,
The parameter determination unit is configured to set one of the parameters corresponding to the date and time belonging to the month or season in which the current time is included in the cooling system according to the appearance frequency when the measurement value cannot be acquired. To decide as,
Cooling system control device characterized by.
The cooling system control device according to claim 1,
The first database, which is the database, accumulates the parameters set in the cooling system within a predetermined accumulation period in association with the time and the measured value,
The cooling system control device includes:
A second database for saving the parameters accumulated in the first database;
A parameter management unit that saves the parameters accumulated in the first database to the second database and deletes the parameters from the first database each time the accumulation period ends;
Further comprising
The parameter determination unit selects one of the parameters stored in the first and second databases after the time point before the accumulation period from the current time point according to the appearance frequency. Determine the parameters to be set in the system,
Cooling system control device characterized by.
The cooling system control device according to claim 1,
When one of the measured values cannot be obtained, the parameter determining unit determines one of the parameters stored in the database according to the appearance frequency and the obtained measured value. Determining as a parameter to be set in the cooling system,
Cooling system control device characterized by.
A cooling system comprising the cooling system control device according to any one of the cooling system control devices according to claim 1.