JP2014236605A - Management system of air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a management system of an air-conditioner in which both operation control for distributing the operation load by temporarily ahead of time schedule, and demand control can be performed, in order to suppress lowering of comfort due to demand control.SOLUTION: Upon receiving a demand alarm signal originated from a demand monitor 51, a demand controller 50 not only performs demand control, but also determines whether or not demand control is required by predicting future increase in power usage based on the accumulated data in the past. When a determination is made that demand control is required, the operation schedule time can be advanced to a time zone ahead of the time zone of demand time limit where origination of the demand alarm signal from the demand monitor 51 is predicted.

Description

  The present invention relates to an air conditioner management system that suppresses the maximum amount of power to be used.

  Conventionally, in an air conditioner applied to, for example, a building multi-air conditioner, a plurality of outdoor units and a plurality of indoor units are used connected to a single power source. In general, the basic charge of electric power of the power company is the maximum demand power contracted (the amount of power that can be used within the demand time period, which is a time interval in units of 30 minutes, 0 minutes to 30 minutes, 30 minutes to 60 minutes per hour) Average power consumption calculated from the above). Then, if the amount of power that can be used is determined by the contracted power, the excess power is applied as contract power for a certain period of time along with the payment of the penalty, thereby causing a loss on the user side, such as the basic charge rising for a certain period of time. It has become. In preparation for such cases, an energy control device that can perform various types of control (so-called demand control) is added to suppress the power consumption when the power consumption is monitored and the contracted power is about to be exceeded. There are things to do.

  As such, “the total predicted power calculated based on the current power of the entire customer facility is compared with the total target power set in advance for the entire customer facility, and the total predicted power is Demand monitoring device that performs demand control so as not to exceed power, unit predicted power calculated based on the current power of the load set by dividing the customer facility by unit, and unit target power set in advance for each unit And a plurality of local demand control devices that perform local demand control so that the unit predicted power does not exceed the unit target power, and the demand monitoring device, when the total predicted power exceeds the total target power The unit target power is set to be low for each local demand control device, and the unit target power after the setting change is used. Demand control device that performs total demand control by suppressing the maximum demand power of the entire customer facility by local demand control performed by all or some of the local demand control devices exceeding the predicted power is proposed (for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-86972 (see pages 8 to 10, see FIG. 8)

  In the control executed by the demand control device as described in Patent Document 1, there is a possibility that the used power amount exceeds the contracted power value based on the accumulated progress of the used power amount in the current demand time period (30 minutes). Is determined from the value of power used and its increasing trend.

  In addition, the demand control device described in Patent Document 1 includes a “demand monitoring device” that monitors whether the amount of power used exceeds the contracted power amount and issues a demand warning signal when it is determined that demand control is necessary, By receiving the demand warning signal, the control for suppressing the electric energy is executed. When such a demand control device is applied to an air conditioner, for example, according to a demand level signal input from the demand monitoring device, if the cooling is performed, the set temperature is changed to a higher value, or the operation mode is changed from cooling to blowing. Or change it. At the heaviest demand alarm level, the air conditioner is stopped.

  Generally, in an air conditioner, demand control is likely to be performed after the start of a cooling operation after a lunch break on a particularly hot day in summer or after the start of a heating operation on a morning in a cold day in winter. One of the causes is that many air conditioners have been stopped for a long time, and the operation starts from a state where the air conditioning load is high (the room is hot in summer and the room is cold in winter). However, it can be mentioned that it is used for driving with a high driving load.

  The present invention has been made to solve the above problems, and in order to suppress a decrease in comfort during demand control, the driving load is reduced by utilizing the surplus power with respect to the contract power in the previous demand period. An object of the present invention is to provide a management system for an air conditioner that can execute control to carry out distributed processing ahead of time.

  The air conditioner management system according to the present invention uses a plurality of air conditioners so that the amount of power used by the entire customer's equipment does not exceed the amount of power that can be used within the demand time period calculated from the contract power. An air conditioner management system that performs demand control that suppresses power consumption, and can be used within a demand time period calculated from the power consumption and contract power consumption of the entire customer's equipment including the plurality of air conditioners. In response to a demand warning signal received from a demand monitoring device that emits a demand warning signal based on the amount of power, a demand control device that executes demand control that suppresses the amount of power used by the plurality of air conditioners, In addition to executing the demand control when the demand control device receives the demand warning signal transmitted from the demand monitoring device. Even if a demand warning signal is not transmitted from the demand monitoring device, it is predicted whether or not the demand warning signal is received based on past accumulated data, and when it is determined that the demand warning signal is received, the demand warning signal is The air conditioning operation can be advanced and executed at the start time of the demand time period predicted to be received and the start time of the previous time period.

  According to the air conditioning apparatus management system of the present invention, not only the demand control but also the operation can be executed in advance based on the past accumulated data and the operation schedule data. Can significantly reduce the user's comfort.

It is the schematic which shows an example of schematic structure of the management system of the air conditioning apparatus which concerns on embodiment of this invention. It is a system configuration figure showing roughly the system configuration of the demand control device of the air harmony device concerning an embodiment of the invention. It is a system block diagram which shows roughly the system configuration | structure of the conventional demand control apparatus. It is a flowchart which shows the flow of the judgment process of whether to perform "forward operation shift" of the demand control apparatus of the air conditioning apparatus which concerns on embodiment of this invention. It is a graph which shows the relationship between the electric energy used during execution of the "forward shift operation shift" of the air conditioning apparatus which concerns on embodiment of this invention, and the electric energy used during normal operation execution. It is the schematic which shows an example of a setting screen.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an example of a schematic configuration of an air conditioning apparatus management system A (hereinafter referred to as system A) according to an embodiment of the present invention. The system A will be described with reference to FIG. This system A collects and manages a plurality of air conditioners. The air conditioner managed by the system A is capable of cooling or heating by using, for example, a refrigeration cycle for circulating a refrigerant. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

As shown in FIG. 1, the system A manages and manages a plurality of air conditioners B, and is electrically connected to a control unit 30 and a communication control line mounted on each of the plurality of air conditioners B. The demand control apparatus 50 connected to is provided. That is, in the demand control device 50, one contract power is determined for one consumer (an air conditioning system including a plurality of air conditioning devices B), and a plurality of air conditioning is performed so as not to exceed the contract power. It is provided for the purpose of suppressing the power consumption of the entire apparatus B.
The air conditioner B includes a compressor 1, a four-way valve 2, a heat source side heat exchanger 3, an expansion device 4, a use side heat exchanger 5, and an accumulator 6 connected by a refrigerant pipe 7. Has been.

  The demand control device 50 includes an actuator (for example, a blower attached to the compressor 1, the four-way valve 2, the heat source side heat exchanger 3, and the use side heat exchanger 5, the expansion device 4) constituting the air conditioner B. Etc.) and a control unit (control unit 30 shown in FIG. 2) for controlling the driving of the signal so that signals can be transmitted and received. Moreover, the demand control apparatus 50 is installed in the centralized management room etc. which can centrally manage the several air conditioning apparatus B, for example.

FIG. 2 is a system configuration diagram schematically showing a system configuration of the demand control device 50. The demand control device 50 will be described in detail based on FIG.
As shown in FIG. 2, the air conditioner B is configured by connecting an outdoor unit 10 and an indoor unit 20. In these units, the actuator described in FIG. 1 is mounted. The outdoor unit 10 is equipped with a control unit 30 that controls driving of each actuator. The outdoor unit 10 is also equipped with an outside air temperature measuring means for measuring the outside air temperature. In FIG. 2, the case where the control unit 30 is mounted on the outdoor unit 10 is described as an example. However, the control unit 30 may be mounted on the indoor unit 20, and the control unit 30 may be installed in any unit. May also be installed so as to be capable of cooperative control.

  The demand monitoring device 51 monitors whether the power consumption of the entire facility of the customer does not exceed the contract power, and sends a demand warning signal when it is determined that there is a risk of exceeding the contract power. The demand warning signal is often divided into levels, and the higher the amount of power used approaches the amount of usable power determined from the contract power, or the higher the predicted excess power, the higher the level. The demand monitoring device predicts and determines from the progress of the amount of power used within the demand time period so that the demand warning signal is transmitted.

  The demand control device 50 includes at least a schedule setting unit 52a, a storage unit 53, a control unit 54, and a clock 55. The demand control device 50 is connected to the control unit 30 of the air conditioning apparatus B via the control unit 54.

The demand control device 50 receives the demand warning signal transmitted from the demand monitoring device 51, thereby reducing the operation load of the air conditioner B and executing the suppression control of the used electric energy. The content of the suppression control is set and stored in the demand control device 50 in advance by associating the target device and the content of control with each level of the demand alarm signal.
The storage unit 53 stores the daily operating state of the indoor unit 20, the daily operating number of the air conditioner B (specifically, the indoor unit 20), the demand control execution history, the set value transmitted from the remote controller (not shown), the air The amount of power used by the harmony device B is stored. The storage content stored in the storage unit 53 can be referred to and rewritten as necessary.

The watt-hour meter 70 is for trading with an electric power company, and measures the amount of power used by the entire facility of the customer. The amount of power used by the entire customer's equipment measured by the watt-hour meter 70 is input to the demand monitoring device 51.
The watt-hour meter 72 measures the amount of power used by the air conditioner B. The amount of power used by the air conditioner B measured by the watt hour meter 72 is input to the demand control device 50 via the metering device 71.

  Whether the demand control device 50 performs the control of suppressing the electric energy by receiving the demand warning signal transmitted from the demand monitoring device 51 as described above, or performs “advanced driving shift” based on a predetermined condition. It also has a function to determine whether or not. The “advanced operation shift” means that the scheduled operation start time of the air conditioner set in advance is advanced (accelerated).

  When the demand control device 50 receives the demand alarm signal, the “operation / stop command”, “cooling / air blowing command”, “set temperature change command”, Send “Capability upper limit change command”. The command transmitted from the control unit 54 is received by the control unit 30. And the control part 30 which received instruction | command controls the operation state of the outdoor unit 10 and the indoor unit 20. FIG. The “advanced driving shift” will be described later.

  As shown in FIG. 2, the demand control device 50 includes a schedule setting unit 52a. The schedule setting unit 52a sets a schedule operation time or sets whether or not to execute “advanced operation shift”. It should be noted that the outside air temperature is used as one condition for determining whether or not to execute “advanced driving shift”.

  As described above, the demand control execution history is stored in the storage unit 53. The demand control execution history includes, for example, “date (month / day)” when the demand control is executed, “power consumption of the air conditioner B” when the demand control is executed, and the indoor unit 20 when the demand control is executed. The number of “operating units” and the like are associated with each other.

  From the air conditioner B and the watt hour meter 72, the demand control device 50 includes the outside air temperature information, the operating state of the indoor unit 20, the temperature state set via the remote controller (set temperature state), the air conditioner B ( Specifically, the number of operating units (capacity state) of the indoor units 20) constituting one air conditioner B and the amount of power used are input.

The outside air temperature may be obtained from a temperature sensor (outside air temperature measuring means 10a) mounted on the outdoor unit 10 constituting the air conditioner B or a newly installed temperature sensor.
The operation state of the indoor unit 20 constituting the air conditioner B includes, for example, a cooling operation, a heating operation, a blowing operation, and a stop.
The set temperature state is the current set temperature set via the remote controller.
The capacity state is a capacity ratio of the indoor unit 20 that constitutes the air conditioner B that is currently operating, and is used for calculating the number of converted operations. This capacity state is used to calculate the scale of the operating state of the entire air conditioning.
The amount of power used for the operation of the air conditioner B may be input to the demand control device 50 via the metering device 71 as the amount of power used measured by the watt hour meter 72.

  The demand control device 50 accumulates input information as data. That is, the demand control apparatus 50 accumulates the information as described above as a database in order to find the power usage pattern and the operation pattern of the past similar days. The accumulated data is stored in the storage unit 53 for each day. In the storage unit 53, at least the season (month and day), the outside air temperature, the amount of electric power used by the air conditioner B, and the number of operating units (the operation scale) of the indoor units 20 constituting the air conditioner B are stored as trend data every day. Stored as accumulated data. In addition, the storage unit 53 stores whether demand control is executed as demand control execution history data (the level of the received demand warning signal, the start time of demand control for each level, and the end time) for each day. .

  Further, the demand control device 50 holds the schedule operation setting data set by the schedule setting unit 52a. However, the schedule operation setting data is not stored in the storage unit 53, but other devices (PC for air conditioning management that operates and monitors the entire air conditioning equipment, and centralized air conditioning that operates and monitors some areas such as floor units collectively. It may be held by a controller, an air conditioning schedule / timer setting device, or the like. In the case of a configuration in which scheduled operation setting data is held in another device, the demand control device 50 reads the scheduled operation setting data from the held device. In order to prepare for such a case, the demand control device 50 may be provided with means for reading the schedule operation setting data via the communication control line or other communication means not shown.

  Furthermore, the demand control device 50 sets a condition for executing “advanced driving shift” as a determination value when there is no past accumulated data (such as at the start of operation) or regardless of past accumulated data. It is possible to do. For example, the demand control device 50 sets 39 ° C. as a determination value for cooling, and sets −15 ° C. as a determination value for heating when the outside air temperature becomes equal to or higher than the determination value. It is preferable that the “advanced driving shift” can be executed when the value becomes lower than the determination value.

  In many cases, the time zone that may cause the “advanced driving shift” to be executed is specified, so there is no past accumulated data or past data only for the schedule operation setting data for a specific time zone. It is desirable to be able to set the outside air temperature condition for executing the “advanced operation shift” regardless of the accumulated data. However, in order to simplify the system, it may be configured to be provided as a common condition for all scheduled operation setting data.

  FIG. 3 is a system configuration diagram schematically showing a system configuration of a conventional demand control apparatus. A conventional demand control device 500 will be briefly described with reference to FIG.

A watt-hour meter 700 that measures the amount of power of the entire customer's equipment is connected only to the demand monitoring device 510.
The demand monitoring device 510 monitors whether or not the used power amount exceeds the contracted power amount based on information from the watt-hour meter 700, and if it is determined that there is a risk of exceeding the contracted power amount, A demand warning signal of a corresponding level is transmitted to the demand control device 500.
The demand control device 500 receives the demand warning signal transmitted from the demand monitoring device 510, and executes the suppression control of the electric energy according to the received level.
The suppression control of the electric energy is executed by receiving a command transmitted from the control unit 530 by the control unit of the air conditioning apparatus 100 and controlling an actuator mounted on the air conditioning apparatus 100.

  However, the demand control device 500 does not predict whether or not to receive a demand warning signal, and does not have a function of determining whether or not to execute “advanced driving shift”. Therefore, the demand control device 500 executes the demand control only after the demand warning signal transmitted from the demand monitoring device 510 is input. The time elapsed until the demand monitoring device 510 issues a demand warning signal is as follows. That is, since the air conditioning load of the air conditioner 100 is high, the air conditioning apparatus 100 is operated using a large amount of electric power, thereby increasing the possibility that the electric power consumption of the entire facility exceeds the electric power that can be used determined by the contract electric power. Follow the process of being sent. Therefore, the higher the air conditioning load, the higher the possibility of receiving a demand alarm signal with a high alarm level, in which case comfort may be greatly impaired.

[Details about “advanced driving shift”]
FIG. 4 is a flowchart showing a flow of a determination process for determining whether or not to execute “advance driving shift” of the demand control device 50. FIG. 5 is a graph showing the relationship between the amount of power used during the “advanced driving shift” and the amount of power used during the normal operation. FIG. 6 is a schematic diagram illustrating an example of a setting screen. Based on FIGS. 4 to 6, the “forward shift operation shift” will be described in detail.

  The demand control device 50 is one of the time points when the current time enters the time zone for each demand time period including the operation command time in the schedule operation setting data (from 00 to 30 minutes per hour, from 30 to 00 minutes per hour). At the time of entering the previous time zone, a determination is made as to whether or not to execute “advance driving shift” (step S1; Y). For example, when the operation command time is set at 12:55, the demand control device 50 starts the demand control determination at the timing of 12:00 and the time of 12:30. To do. Further, when the operation command time is set at 13:05, the demand control determination is started at two times of 12:30 and 13:00. When the current time is not included in any of the predetermined time period including the operation command time of the schedule operation setting data and the time period immediately preceding it, the “advanced operation shift” is not executed (step S1; N Step S6).

  Next, the demand control device 50 receives the demand warning signal from the demand monitoring device 51 and determines whether or not “demand control” is being executed (step S2). When the demand control device 50 has not received a demand warning signal from the demand monitoring device 51 (step S2; N), the demand control device 50 executes the next step (step S3). On the other hand, when the demand control device 50 has already received the demand warning signal from the demand monitoring device 51 (step S2; Y), the demand control device 50 does not execute the “advanced driving shift” (step S6). In this case, the demand control device 50 performs normal demand control without performing the “advanced driving shift”.

  Then, the demand control device 50 sets the contents set by the user from the outside as the outside air temperature condition where the current outside air temperature is “advanced operation shift” (for example, 39 ° C. or more for cooling, −15 ° C. or less for heating, etc.) (Step S3). For example, the user can set a start condition for “advanced driving shift” via the demand control device 50 or a remote controller. A setting screen as shown in FIG. 6 is displayed on the display unit of the demand control device 50 or the remote controller so that the setting from the user can be accepted.

  When the current outside air temperature corresponds to the content set by the user as the outside air temperature condition of “forward operation shift” (step S3; Y), the demand control device 50 executes “forward operation shift” (step S5). On the other hand, when the current outside air temperature does not correspond to the content set by the user as the outside air temperature condition of “forward shift operation shift” (step S3; N), the demand control device 50 executes the next step (step S4).

In step S4, the demand control device 50 extracts a similar pattern from the trend data of the stored past stored data under the following conditions, and then uses the demand control execution history data in the similar pattern to It is determined whether or not the “advanced driving shift” is executed. The numbers in parentheses are one example for summer.
(A) Trend data (1) Season (month and day) is similar (within ± 62 days)
(2) The outside air temperature is similar (the outside air temperature of the past 2 hours is within ± 2 ° C)
(3) The amount of power used is similar (the amount of power used for the past two hours is within ± 20%)
(4) The operating scale (number of operating units) is similar (the number of operating units for the past 2 hours is within ± 20%)
(5) There is a schedule operation setting of similar operation scale (number of operating units) until 1.5 hours later (within ± 20% in terms of unit number)
The operating scale is calculated by multiplying the number of operating units by the capacity of the indoor units 20 constituting the air conditioner B and the operating capacity ratio (“the number of indoor units 20 × the capacity of the indoor units 20 × the indoor units 20 The value obtained by taking the sum of the “capacity ratios of the two.” In the case of the past two hours or the like, the value obtained by further accumulating them on the time axis may be compared.

(B) Demand control execution history data (1) Whether or not demand control is executed (2) Demand alarm signal level received when demand control is executed (3) Demand control when demand control is executed Start time and end time The time period from the demand control execution history data to some previous section including the section every 30 minutes including the operation command time (for example, the operation command time is set at 13:05) In this case, if there is a record of demand control executed until 14:30 if there are three sections, it is determined that demand control has been executed. Also, the strength is digitized as 1, 2, 3 according to the level of the received demand warning signal, and the sum of the values multiplied by the execution time for each level calculated from the start time and end time is calculated. Then, it is set as additional information as “demand warning amount” of the day. Further, when the demand alarm signal level changes suddenly from 0 to 3 or from 1 to 3 within one demand period, it is set as additional information as “the demand alarm level suddenly increases”. Further, the maximum level of the demand alarm signal level is set as “maximum demand alarm level”, which is also added information.

  The demand control device 50 finds all the days on which the operation status of the air conditioner B of today and all the conditions of (A) are similar from the trend data, and extracts them as similar patterns.

  Then, when there is no demand control execution history in the extracted similar pattern (step S4; N), the demand control device 50 determines that the “advance driving shift” is unnecessary and does not execute the “advance driving shift”. (Step S6). If there is a demand control execution history, the ratio of the number of days with the demand control execution history to the number of similar pattern days, and the additional information "demand alarm amount", "demand alarm level sudden rise", "maximum demand alarm level" When it is determined that a “forward shift operation shift” is necessary (step S4; Y), a “forward shift operation shift” is executed (step S5). For example, when the demand control execution history is one day in a similar pattern, an algorithm that always executes “advanced driving shift” regardless of the additional information may be used. Alternatively, even if there is a demand control execution history, all the history is <“alarm level sudden increase”, the percentage of days with the demand control execution history is 50% or less, and the “maximum demand alarm level” is 1 or less In such a case, an algorithm may be used that determines that “advanced driving shift” is not necessary for a condition where the demand warning signal received is assumed to be a slight level, such as “do not execute“ advanced driving shift ”>.

  Similar to the demand monitoring device 510, the demand monitoring device 51 monitors the amount of power used by the power used every 30 minutes (00 to 30 minutes per hour and 30 minutes to 00 minutes per hour). . When a general demand monitoring device (for example, the demand monitoring device 510) continues to use power with a tendency that the power used for each 30-minute time zone remains as it is, the available power amount calculated from the contract power is calculated. When it is determined that there is a possibility of exceeding, a demand warning signal is transmitted. The higher the possibility that the power amount exceeds the contracted power amount, the higher the alarm level is transmitted.

  In such a demand monitoring device, information other than “elapsed power usage within the demand time limit” cannot be used. For this reason, in the demand monitoring device (for example, the demand monitoring device 510), it is impossible to predict the future power consumption, such as when the power usage will increase or decrease. On the other hand, in the system A, the demand control device 50 extracts a similar pattern from the past accumulated data and the setting contents of the scheduled operation that is the operation schedule data, and compares the extracted similar pattern with the demand warning signal. It is possible to predict whether the possibility of receiving from the demand monitoring apparatus is high or low. Therefore, it is possible to avoid the demand warning signal from being transmitted from the demand monitoring device due to an increase in the power consumption of the air conditioning equipment, or to realize the air conditioning operation to change the alarm level to a lower (lighter) level. Therefore, even if demand control is executed, it is possible to greatly suppress a decrease in user comfort.

  When the “advanced operation shift” is executed, as shown in FIG. 5, the start time of the air conditioning operation is advanced about 30 minutes, for example, and the operation is started during the lunch break. Therefore, according to the system A, it is generally assumed that demand control is easily performed (after the start of the cooling operation after the lunch break on a particularly hot day in summer, and the heating operation in the morning on a cold day in winter) Demand control will not be executed later), but it will be easier to start demand control in the time zone earlier than that time zone. There is no effect. And when the time enters the demand time period (time zone) during which demand control is easily performed, the air conditioning load has already been processed and air conditioning has been performed to some extent. The possibility that a strong (demand) level warning signal is transmitted is reduced, and the alarm duration time is also shortened, so that a decrease in comfort can be significantly suppressed.

  As described above, the system A is configured to execute the “advanced driving shift” based on a predetermined condition. Therefore, the power consumption is large and the possibility of receiving a demand warning signal is predicted, and the power consumption increases. It is possible to shift the driving start time to a time zone before starting, that is, a time zone before a demand warning signal is transmitted. Therefore, according to the system A, it is possible to realize an air-conditioning operation that avoids the demand control being executed or lowers the demand alarm level. Even if the demand control is executed, the user's comfort is greatly reduced. Can be suppressed.

  In the embodiment, the items for controlling the air conditioner B have been described as operation and stop. However, the same applies to the case where the other operation modes are changed during the lunch break or before the working time to perform the air blowing operation. be able to. Similarly, the present invention can be similarly applied to a case where the set temperature is changed during the lunch break or before the working time and is subjected to weak cooling or heating. Also, the time for advance is not particularly limited, and the advance time may be set according to the current outside air temperature, the operation mode, and the like.

  DESCRIPTION OF SYMBOLS 1 Compressor, 2 Four way valve, 3 Heat source side heat exchanger, 4 Throttle device, 5 Use side heat exchanger, 6 Accumulator, 7 Refrigerant piping, 10 Outdoor unit, 10a Outdoor temperature measuring means, 20 Indoor unit, 30 Control Unit, 50 demand control device, 51 demand monitoring device, 52a schedule setting unit, 53 storage unit, 54 control unit, 55 clock, 70 watt hour meter, 71 metering device, 72 watt hour meter, 100 air conditioner, 500 demand control Device, 510 demand monitoring device, 530 control unit, 700 watt hour meter, A air conditioning device management system, B air conditioning device.

Claims (4)

An air conditioner that performs demand control that suppresses the amount of power used by multiple air conditioners so that the amount of power used by the entire customer's equipment does not exceed the amount of power that can be used within the demand time period calculated from the contract power Management system,
Demand received from a demand monitoring device that sends a demand warning signal based on the amount of power used within the demand time period calculated from contracted power and the amount of power used by the entire customer's equipment, including the plurality of air conditioners In response to the alarm signal,
A demand control device for executing demand control for suppressing power consumption of the plurality of air conditioners;
The demand control device includes:
In addition to executing the demand control when receiving the demand warning signal transmitted from the demand monitoring device,
Even if a demand warning signal is not transmitted from the demand monitoring device, it is predicted whether or not the demand warning signal is received based on past accumulated data, and when it is determined that the demand warning signal is received, the demand warning signal is A management system for an air conditioner, characterized in that the air conditioning operation can be executed ahead of time at the start time of a demand time period predicted to be received and the start time of the previous time period. The demand control device includes:
The management of the air conditioner according to claim 1, wherein whether or not a demand warning signal is received is predicted based on demand control execution history data in a similar pattern extracted from trend data of the past accumulated data. system. The trend data includes
It includes at least the season, outside air temperature, power consumption, and the number of indoor units in operation.
In the demand control execution history data,
The level of the received demand warning signal, the date when the demand control is executed, the start time and the end time for each level of the received demand warning signal are included. Air conditioning equipment management system. The condition for performing the air-conditioning operation that is executed in a time period before the demand warning signal is transmitted from the demand monitoring device can be set from the outside. 5. An air conditioning apparatus management system according to claim 1.

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