JP5980002B2 - Refrigeration / refrigeration system - Google Patents

Description

  The present invention relates to a refrigeration / refrigeration system that performs power reduction control of one or more refrigeration apparatuses including one or more refrigerators (condensing units) and one or more cooling apparatuses (unit coolers). is there.

  In a refrigeration / refrigeration system using a refrigeration cycle, a refrigerant circuit in which a compressor, a condenser (heat exchanger), a throttling device (expansion valve) and an evaporator (heat exchanger) are generally connected by piping to circulate the refrigerant. Is configured. Then, a cooling operation or the like is performed while changing the pressure in the pipe by utilizing the fact that the refrigerant absorbs and dissipates heat from the air to be heat exchanged during evaporation / condensation.

  In particular, in a refrigeration / refrigeration system in which a unit cooler arranged in a refrigerator, a cooling device such as a showcase (hereinafter referred to as a cooler), and a refrigerator are connected by piping, for example, the refrigerator has a compressor and a condenser. The cooling device (cooler) has an expansion valve and an evaporator to form a refrigerant circuit.

  In such a refrigeration / refrigeration system, when the total power consumption increases, the power consumption of the air conditioner is reduced so that the total power consumption does not exceed the set power amount (for example, the contract power amount with the power company). The so-called demand control is performed (see, for example, Patent Documents 1 to 4). Patent Document 1 discloses performing demand control that sequentially decreases the operating frequency of a plurality of compressors so that the power used does not exceed the set power. Patent Document 2 discloses that normal operation is performed unless the total power used by the entire system, not for each outdoor unit, exceeds the upper limit demand power.

  Patent Document 3 discloses that a high load is applied when power consumption during demand control is limited by performing a heat storage operation within a period in which demand control is not performed and power consumption is not limited. It is disclosed that even if it is applied, it can be dealt with. Patent Document 4 discloses that demand control is performed using an external controller instead of a built-in controller in a component device so that power consumption does not exceed a predetermined integrated value in a refrigeration / refrigeration system.

  By the way, in the refrigeration / refrigeration system, the cooler in the system and the refrigerator are connected for communication by communication lines or wireless so that various signals can be transmitted and received (communication). In addition, when a plurality of refrigerators and coolers are connected, in addition to using an external controller as shown in Patent Document 4, a centralized management control device serving as a host controller is further connected for communication. It is known to communicate with other refrigerators and coolers. Then, the centralized management control device performs operation control (including management based on a schedule) of each cooler and each refrigerator based on the data regarding the operation state included in the signals from each cooler and each refrigerator.

JP-A-10-339529 Japanese Patent Laid-Open No. 2007-220038 JP 2008-25879 A JP 2010-78272 A

  When suppressing an increase in power consumption as in Patent Documents 1-4, it is common to save cooling capacity such as limiting the compressor operating frequency of a refrigerator (condensing unit). However, when the cooling capacity is saved, it is conceivable that the quality of the article is affected by the temperature rise in the refrigerated warehouse storing the article to be cooled such as frozen food. For this reason, it is desired to maintain the quality without impairing the quality of the article to be cooled and to suppress the increase in power consumption as a whole.

  The present invention has been made to solve the above-described problems, and is a refrigeration / refrigeration system capable of preventing the quality of articles to be cooled in a low-temperature facility from being impaired when reducing power. The purpose is to provide.

Refrigerated system according to the present invention reduces a plurality of temperature controlled apparatus provided with one or more of the refrigerator and 1 or a plurality of cooling devices connected to one refrigerant circuit, the power consumption of the temperature controlled device and reduction control device for controlling the temperature controlled device, respectively to perform the reduction control operation, there is for managing a plurality of temperature controlled device, performs power reduction operation to reduce a control device for controlling the respective temperature controlled device A centralized management control device that transmits a reduction control request to the effect that the reduction control device determines whether or not the reduction control operation is possible for all the refrigerators and cooling devices in the refrigerator-freezer. It was determined that reduction determination means for determining based on the operating state or load state of the apparatus, and the reduction determination means can reduce the power of all refrigerators and cooling devices. And a reduction drive control means for performing only the reduction control operation in case, reduction determining means, which transmits the reduced failure information to the centralized management controller when it is determined that it can not reduce the control operation, centralized management control device However, a reduction control request is made to another refrigeration / refrigeration apparatus that is different from the refrigeration / refrigeration apparatus that has sent the non-reduction information when the non-reduction information is received.

  According to the present invention, since the reduction control operation is performed only when it is determined that all the components connected to the refrigerant circuit in the refrigeration apparatus are capable of the reduction control operation, the entire refrigeration / refrigeration system is related to cooling. The power reduction control can be realized while reliably preventing the temperature of the article from rising and degrading the quality.

It is a schematic diagram showing the structure of the freezing / refrigeration system which concerns on embodiment of this invention. It is a schematic diagram which shows an example of the freezing / refrigeration apparatus in the freezing / refrigeration system of FIG. It is a block diagram which shows an example of the reduction control apparatus of the freezing / refrigeration system of FIG. It is a flowchart which concerns on Embodiment 1 of the control method in the freezing / refrigeration system of FIG. It is a flowchart which concerns on Embodiment 2 of the control method in the freezing / refrigeration system of FIG.

Embodiment 1
Hereinafter, preferred embodiments of the refrigeration / refrigeration system of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a refrigeration / refrigeration system 1 according to an embodiment of the present invention. The refrigeration / refrigeration system 1 in FIG. 1 is a refrigeration / refrigeration system installed in, for example, a store or a freezer warehouse, and includes a centralized management control device 2 and a plurality of refrigeration / refrigeration devices 100A and 100B. In FIG. 1, the refrigeration and refrigerating apparatuses 100A and 100B have substantially the same configuration, and in the following description, if it is not necessary to distinguish between them, the same reference numerals are assigned to the refrigeration units. A description of the same type of configuration of the refrigeration apparatus 100B is omitted.

  The centralized management control device 2 is capable of data transmission with each of the freezer / refrigerators 100A and 100B via a wired or wireless network 3. Note that data transmission can be multiplexed. The centralized management control device 2 manages the refrigeration / refrigeration apparatuses 100A and 100B in the refrigeration / refrigeration system 1 by transmitting an instruction signal to each of the refrigeration / refrigeration apparatuses 100A and 100B or by receiving an operation status or the like.

  For example, the central management control device 2 receives operation data of the refrigerators 110A1, 110A2 and the cooler 200A. The operation data is, for example, an operation time in a predetermined unit time (for example, one day), the number of start / stop times of the compressor, the maximum / minimum / average drive frequency of the compressor, the accumulated operation time, and the like. Further, the central management control device 2 has a function of creating a driving condition such that the pressure on the low pressure side of the refrigerant circuit becomes a target pressure based on the received operation data, and transmitting it to the refrigerators 110A1 and 110A2. doing.

  Further, the central management control device 2 has a function of transmitting a reduction control request to each of the refrigeration devices 100A and 100B. This reduction control request may be automatically created in the centralized management control apparatus 2 or may be created by an input from an administrator or the like. For example, the central management control device 2 monitors the total power consumption of the entire refrigeration / refrigeration system 1 and automatically transmits it to each of the refrigeration / refrigeration devices 100A and 100B when the total power consumption exceeds the set upper limit power. It may be.

  The freezer / refrigerator 100A has, for example, two refrigerators 110A1 and 110A2. The refrigerators 110A1 and 110A2 are provided with refrigerator controllers 102A1 and 102A2 that serve as control devices. The cooler 200A is provided with cooler-side controllers 202A and 202B that serve as control devices. The refrigerator-side controllers 102A1 and 102A2 and the cooler-side controller 202A manage and control the refrigerators 110A1 and 110A2 and the cooler 200A based on instructions sent from the centralized management control device 2 via the network 3, respectively. The various controllers in each freezer / refrigerator 100A are in a state in which data can be transmitted to each other via the network (transmission line) 3a.

  In addition, in FIG. 1, although illustrated about the case where each freezer / refrigeration apparatus 100A, 100B has the same structure, if it is connected to one refrigerant circuit, the number of components is different. Also good. For example, the refrigeration apparatus 100B may be configured to include one refrigerator and two coolers.

  FIG. 2 is a schematic diagram showing an example of the freezer / refrigerator 100A of FIG. The freezing / refrigeration apparatus 100A includes two refrigerators (condensing units, heat source side units) 110A1 and 110A2, and one cooler (a load side unit such as a unit cooler or a showcase) 200A. In FIG. 2, the refrigerator 110A1 and the refrigerator 110A2 have substantially the same configuration, and when it is not necessary to distinguish in the following description, the description of the same type of configuration of the refrigerator 110A2 Is omitted.

  The refrigerator 110A1 has a compressor 103A1 and a condenser 104A1. The compressor 103A1 sucks in refrigerant, compresses it, and sends out (discharges) it in a high temperature / high pressure state. The compressor 103A1 is driven by the inverter drive circuit 108A1, and the compression capacity (the amount of refrigerant delivered per unit time) changes by changing the operation frequency of the inverter drive circuit 108A1. The operation of this inverter drive circuit 108A1 is controlled by the refrigerator controller 102A1.

  The condenser 104A1 performs heat exchange between the refrigerant from the compressor 103A1 and, for example, outdoor air (outside air), and condenses and liquefies the refrigerant. The condenser blower 112A1 sends outside air to the condenser 104A1 and promotes heat exchange with the refrigerant flowing through the condenser 104A1. The condenser fan 112A1 is controlled by the refrigerator-side controller 102A1, and can change the air flow rate by arbitrarily changing the operation frequency.

  A liquid reservoir (receiver) 105A1 and an accumulator 106A1 are respectively arranged on the refrigerant circuit. The liquid reservoir 105A1 is disposed at a position where liquid refrigerant (liquid refrigerant) flows, such as the refrigerant outflow side of the condenser 104A1, and functions as a tank for storing excess refrigerant. The accumulator 106A1 is a tank that prevents liquid refrigerant from passing through and prevents the liquid refrigerant from flowing into the compressor 103A1.

  Further, the refrigerator 110A1 includes a low pressure sensor 109A1, an outside air temperature sensor 113A1, and a high pressure sensor 114A1. The low-pressure sensor 109A1 is attached to the suction side of the compressor 103A1, and detects the pressure of the portion on the low-pressure side in the refrigerant circuit. The outside air temperature sensor 113A1 detects the outside air temperature in the environment where the refrigerator 110A is installed. The high-pressure sensor 114A1 is attached to the discharge side of the compressor 103A1, and detects the pressure of the portion on the high-pressure side of the refrigerant circuit. Note that the level of pressure in the refrigerant circuit is not related to the reference pressure, but represents the level of relative pressure generated by compression by a compressor or the like, or pressure reduction by an expansion valve or the like. The same applies to the temperature.

  The cooler 200A includes a throttle valve (expansion valve) 201A, an evaporator (cooler) 203A, and an evaporator blower 204A, which are decompression devices. The throttle valve 201A depressurizes the refrigerant flowing into the cooler 200A and adjusts the amount of refrigerant flowing into the evaporator 203A. The evaporator 203A evaporates the refrigerant flowing in from the throttle valve 201A, and the evaporator blower 204A sends air to the evaporator 203A. When the evaporator blower 204A blows air to the evaporator 203A, heat is exchanged between the refrigerant and the air to be cooled to cool the air. The cooler 200A is provided with a suction temperature sensor 205A, and the suction temperature sensor 205A detects the intake air temperature to the cooler 200A.

  The operation of the refrigerant flowing in the refrigeration cycle circuit of the refrigeration apparatus 100A shown in FIG. 2 is as follows. The high-temperature and high-pressure gas refrigerant discharged from the compressors 103A1 and 103A2 is sent to the condensers 104A1 and 104A2 through piping. The refrigerant in the condensers 104A1 and 104A2 is cooled by the ventilation from the condenser fans 112A1 and 112A2, and is condensed to become a liquid refrigerant. The liquid refrigerant flowing out of the refrigerators 110A1 and 110A2 passes through the liquid refrigerant communication pipe 19 and is sent to the throttle valve 201A of the cooler 200A. The two-phase refrigerant of liquid and gas that has become low temperature and low pressure at the throttle valve 201A is heated by the air blown from the evaporator blower 204A in the evaporator 203A in the cooler 200A and evaporated to become a low pressure gas refrigerant. The low-pressure gas refrigerant is sent to the refrigerator 110A through the gas refrigerant communication pipe 20. The low-pressure gas refrigerant that has entered the refrigerator 110A is sent to the compressors 103A1 and 103A2, respectively.

  FIG. 3 is a functional block diagram illustrating an example of the reduction control device 130 of FIG. FIG. 3 illustrates the case where the reduction control device 130 is incorporated in the refrigerator controller 102A1. The reduction control device 130 determines whether or not there is a reduction control request (control type (content), control time, etc.) and determines the state of the refrigerators 110A1 and 110A2 and the cooler (load side) 200A constituting the refrigeration apparatus 100A. Is what you do. Specifically, the reduction control device 130 includes a reduction determination unit 131, a reduction drive control unit 132, and a storage unit 133.

  The reduction determination unit 131 determines whether or not the reduction control operation is possible based on all the operation states or load states of the refrigerators 110A1 and 110A2 and the cooler 200A. Various methods can be used to determine the load state and the like. For example, a setting threshold value indicating that the reduction control operation is possible is stored in the storage unit 133 in advance. Then, the reduction determination unit 131 compares the detection results of the low pressure sensor 109A1 and the high pressure sensor 114A1 indicating the operating state or the outside air temperature sensor 113A1 indicating the load state and the set threshold value stored in the storage unit 133. Thus, it is determined whether or not the reduction control operation is possible for the refrigerators 110A1 and 110A2.

  Further, when the reduction determination unit 131 determines whether or not the reduction control operation is possible from the operation state of the cooler 200A, for example, the difference between the temperature t1 detected in the suction temperature sensor 205A and the preset reduction set temperature Tmref It is determined whether Δt (= t1−Tmref) is separated by a predetermined temperature Tms (Δt> Tms). The reduction determination unit 131 determines that the reduction control operation is possible when the difference Δt is within the predetermined temperature Tms, and determines that the reduction control operation is not possible when the difference Δt is far from the predetermined temperature Tms. .

  The reduction drive control unit 132 controls the reduction control operation of the refrigerators 110A1 and 110A2 and the cooler 200A based on the determination of the reduction determination unit 131. Any method may be used as long as the drive is controlled so as to reduce the power. For example, when it is determined that the reduction control operation is possible, the reduction drive control unit 132 controls the inverter drive circuit 108A to drive at a reduction control operation frequency whose upper limit of the operation frequency is lower than that in the normal operation. Specifically, when the maximum frequency is set to 110 Hz × 2 units, the reduction drive control means 132 is driven by reducing the maximum frequency by 50% and setting the combined maximum frequency of the two refrigerators 110A1 and 110A2 to 110 Hz. Control. Alternatively, the reduction drive control means 132 may perform drive control so that the current operation frequency (for example, 200 Hz) is forcibly reduced by 50% (for example, the maximum frequency is 100 Hz). Further, the reduction drive control means 132 may reduce the electric power by reducing the rotational speed of the blower or cooling fan.

  Further, the reduction determination unit 131 has a function of determining whether or not the reduction control operation can be continued based on a change in the load state when the refrigeration apparatus 100A is performing the reduction control operation. Specifically, the reduction determination unit 131 monitors the outputs from the various sensors, and performs a reduction control operation when an environmental change such as an increase in the suction temperature by a predetermined set temperature occurs during the reduction control. Is sent to the reduction drive control means 132. Then, the reduction drive control means 132 switches from the reduction control operation to the normal operation. As a result, if there is a case where the quality of the article to be cooled cannot be maintained unless the high-load operation is performed, the operation can be switched to the normal operation, and the quality of the article to be cooled can be reliably protected. it can.

  The reduction determination unit 131 has a function of measuring the time during which the reduction operation is performed and instructing the reduction drive control unit 132 to switch from the reduction control operation to the normal operation when a predetermined time has elapsed. doing. The predetermined time may be stored in the storage unit 133, or may be in accordance with the reduction control operation time included in the reduction control request transmitted from the central management control device 2.

  Thus, the reduction control operation is not performed for each module during the reduction control, but only when the reduction control operation is possible for all the devices connected to one refrigerant circuit, the freezer / refrigeration apparatus 100A. (Or 100B) By performing the reduction control operation as a whole, it is prohibited to perform the reduction control operation until there is a risk of impairing the quality of the article or the like to be cooled, and power reduction while giving priority to quality maintenance Can be achieved.

  That is, for example, when two coolers and two refrigerators are connected to one refrigerant circuit and only one cooler is capable of reduction control operation, it is possible to keep the operating frequency of the refrigerator low. . However, even if one cooler is capable of reduction control operation, if the other cooler is in a high load state, it is difficult to maintain the quality of the object to be cooled. Further, in order to prevent frosting and liquid return to the compressor, protection control is performed so as not to drop the operating frequency of the compressor below a predetermined lower limit value. Under such protection control, there is a problem that if the reduction control operation is performed, the effectiveness of the protection control cannot be achieved.

  Therefore, as shown in FIG. 1 to FIG. 3, by performing a reduction exercise only when all the refrigerators 110A1, 110A2 and the cooler 200A connected to one refrigerant circuit are capable of reduction control operation, It is prohibited to perform the reduction control operation until there is a risk of deteriorating the quality of an article or the like, and the reduction control operation can be performed while giving priority to quality maintenance.

  FIG. 4 is a flowchart showing Embodiment 1 of the control method of the refrigeration / refrigeration system of FIG. 1, and the control method of the refrigeration / refrigeration system will be described with reference to FIGS. First, a reduction control request is made from the centralized management control device 2 to the refrigerator 110 (step ST1). At this time, the reduction control time, the type of reduction control, and the like are transmitted to the refrigeration apparatus 100A as the reduction control request.

  Then, in the refrigerator-side controller 102A1 in FIG. 4, the load state is determined for all the component devices connected to the refrigerant circuit (steps ST2 and ST3). Specifically, the operation state on the cooler 200A side is determined (step ST2), and the load states of the refrigerators 110A1 and 110A2 are determined (step ST3). As described above, the load state may be determined in the order of cooler 200A to refrigerators 110A1 and 110A2, or the load states of refrigerators 110A1 and 110A2 and cooler 200A may be determined at the same time. When protection control is performed in the refrigerators 110A1 and 110A2, the reduction determination unit 131 determines that the reduction control operation cannot be performed, and the normal operation is continued without performing the reduction control operation.

  On the other hand, when it is determined that all devices connected to the refrigerant circuit are capable of reduction control, reduction control operation is executed in the unit (step ST4). For example, the reduction drive control means 132 performs drive control by setting the upper limit of the operation frequency to a frequency for reduction control operation that is lower than that during normal operation.

  Then, during execution of the reduction control operation, whether or not the environment in which the refrigerators 110A1 and 110A2 and the cooler 200A are installed is changed is determined by the reduction determination unit 131 based on outputs from various sensors (step ST5). . When there is a change in the environment, it is determined whether or not the reduction control operation is possible with respect to the environmental change (steps ST2 to ST5). When there is no change in the environment, it is determined whether or not the elapsed time since the reduction control operation is executed in the reduction determination means 131 is longer than the set elapsed time Tref10 (step ST6). When the predetermined time Tref10 has elapsed since the execution of the reduction control operation, the reduction control operation ends based on an instruction from the reduction determination unit 131 to the reduction drive control unit 132 (step ST7), and the normal operation returns.

  According to the above embodiment, the reduction control operation is performed after determining the load state of the entire refrigerant circuit by individually determining the load state of all the refrigerators 110 and the coolers 200A in the refrigerant circuit. Therefore, it is possible to improve the reliability of the system, such as an operation that does not impair the quality maintenance of the stored items due to the temperature rise of the refrigerated warehouse that stores the articles to be cooled. In addition, overall energy saving can be achieved by reducing the load on the refrigeration / refrigeration system that consumes a large amount of power.

Embodiment 2
FIG. 5 is a flowchart showing Embodiment 2 of the control method of the refrigeration / refrigeration system of FIG. 1, and the control method of the refrigeration / refrigeration system will be described with reference to FIG. In the refrigeration / refrigeration system control method of FIG. 5, parts having the same steps as those in the flowchart of FIG. The control method of the refrigeration / refrigeration system in FIG. 5 differs from the control method of the refrigeration / refrigeration system in FIG. 4 in that information indicating that a reduction request is made to another device 100B when it is determined that the control load is a reduction control load. It is a point to output.

  Specifically, when it is determined that any one of the refrigerators 110A1 and 110A2 and the cooler 200A cannot be reduced (steps ST2 and ST3), whether or not the elapsed time from the start of the reduction process request is equal to or longer than the set time Tref. Determination is made (step ST11). When the elapsed time exceeds the set time (T> Tref), a message indicating that a reduction control request is issued from the reduction determination unit 131 of FIG. 4 to the central management control device 2 to the other refrigeration unit 100B is output via the network 3. (Step ST12). In this way, even if the refrigerating and refrigerating apparatus 100A cannot perform the reduction control operation, it is possible to reduce the power in the entire refrigerating / refrigeration system 1 by searching for the possibility that the other refrigerating and refrigerating apparatus 100B can perform the reduction control operation. Can be improved.

  The embodiment of the present invention is not limited to the above embodiment. For example, in the above embodiment, the reduction control request is illustrated as being performed from the centralized management control device 2 to each of the freezer / refrigerators 100A and 100B via the network 3, but directly to each of the freezer / refrigerators 100A and 100B. It may be input. In other words, since the determination process of the operating state is performed for each of the freezer / refrigerators 100A and 100B, in each of the freezer / refrigerators 100A and 100B, for example, based on the display unit 115A1 and the operation unit (reduction request receiving means) 116A1. A reduction control request may be made.

  Further, for example, in FIGS. 3 and 4, the case where the reduction controller 130A is incorporated in the refrigerator-side controller 102A1 is illustrated, but each of the refrigerators 110A1, 110A2 and the cooler 200A has the reduction controller 130, respectively. Thus, it may be determined whether or not each device can perform the reduction control operation.

  Furthermore, the reduction control device 130 may be incorporated in the central management control device 2, and it may be determined whether or not reduction control is possible on the central management control device 2 side. Further, when the central management control device 2 determines that the reduction control operation is possible, the central management control device 2 sets drive conditions for the power reduction control operation, and the refrigerators 110A and 110B and the cooler 200A, You may make it transmit to 200B via the network 3. FIG.

  Further, in the above embodiment, the case where the reduction control is performed by changing the operation frequency in the inverter drive circuit 108A is illustrated, but the reduction control may be performed by limiting the power consumption of other components. Good. For example, when two refrigerators 110A1 and 110A2 are provided, reduction control may be performed by switching from two-unit operation to one-unit operation, or the rotational speed of the fans 112A1, 112A2, and 204A may be reduced. Reduction control operation may be performed. That is, the method is not limited as long as the power consumption of the entire refrigerator-freezer 100A is reduced.

  Further, the reduction determination unit 131 determines whether or not the reduction control operation is possible based on the operation state. However, the reduction control operation is possible by comparing the amount of power to be reduced sent as a reduction request with the operation state. It may be determined whether or not.

  DESCRIPTION OF SYMBOLS 1 Refrigeration / refrigeration system, 2 Centralized management control device, 3 Network, 100A, 100B Refrigeration / refrigeration device, 102A1, 102A2, 102B1, 102B2 Refrigerator side controller, 103A1, 103A2 Compressor, 104A1, 104A2 Condenser, 105A1, 105A2 Liquid Reservoir, 106A1, 106A2 Accumulator, 108A1, 108A2 Inverter drive circuit, 109A1, 109A2 Low pressure sensor, 110A1, 110B1, 110A2, 110B2 Refrigerator, 112A1, 112A2 Condenser fan, 113A1, 113A2 Outside air temperature sensor, 114A1, 114A2 High pressure pressure Sensor, 115A1 display unit, 116A1 operation unit, 200A, 200B cooler, 201A throttle valve (expansion valve), 203A evaporator, 204 A A blower for evaporator, 205A Suction temperature sensor, 130 reduction control device, 131 reduction judgment means, 132 reduction drive control means, 133 storage means, 202A, 202B cooler side controller, 400A, 400B remote control.

Claims (4)

A plurality of refrigerating and refrigerating apparatuses including one or more refrigerators and one or more cooling apparatuses connected to one refrigerant circuit;
And reduction control device for the controlling temperature controlled device power consumption the respective temperature controlled apparatus to perform the reduction control operation to reduce the respective
A centralized management controller that manages the plurality of refrigeration units, and transmits a reduction control request for performing a power reduction operation to the reduction control unit that controls each of the refrigeration units;
With
The reduction controller is
Reduction determination means for determining whether or not the reduction control operation is possible for all the refrigerators and the cooling devices in the refrigerator-freezer based on an operating state or a load state of the refrigerator and the cooling device; ,
And a reduction drive control means performs the reduction control operation only when it is determined that it is possible to reduce the power of all of the refrigerator and the cooling device in the reduction determining means,
When the reduction determination means determines that the reduction control operation cannot be performed, the reduction determination information is transmitted to the centralized management control device,
The centralized management control device makes a reduction control request to another refrigeration / refrigeration apparatus different from the refrigeration / refrigeration apparatus that has sent the non-reduction possible information when the reduction impossibility information is received. system.   2. The refrigeration / refrigeration system according to claim 1, wherein the reduction drive control means controls the operation state of the compressor of the refrigerator to execute the reduction control operation. The refrigerator includes a refrigerator control controller, and the cooling device includes a cooling device controller.
The refrigeration / refrigeration system according to claim 1 or 2, wherein the reduction control device is incorporated in the refrigerator control controller or the cooling device control controller. The refrigerator or the cooling device is refrigerated system according to any one of claims 1 to 3, characterized in that with the reduction request accepting means for accepting said reduction control request.

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