JP2009115392A - Energy-saving control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy-saving control system, easily introduced by an entrepreneur and a consumer possessing especially a building where old equipment remains, not to speak of a new building, improving usability, heightening the work efficiency of system organization, maintaining the contract class so that the demand does not exceed contract demand, and efficiently and inexpensively achieving energy-saving operation according to how much power is consumed. <P>SOLUTION: In this energy-saving control system 1, a centralized control device 11 sets a lower target level in air conditioning equipment 17, 24 of a large demand block based on the demand of each block from a block demand monitoring part 16, 23 of each block when the total demand is determined to exceed a target level according to the demand monitoring result in a total demand monitoring part 13, and the block demand monitoring part 16, 23 of each block monitors the demand not to exceed a transmitted target level to control the air conditioning equipment 17, 24 by each block. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an energy-saving control system that efficiently performs measurement, monitoring, and control on air conditioning equipment installed in a plurality of sections such as distributed rooms and corridors, and monitors demand so that it does not exceed contract power. .

  Electricity charges are determined based on the electricity supply agreements of local power companies. For example, in a facility with a large number of buildings and experimental buildings on a large site such as a university, the electricity charge is for high-voltage contracts, etc., where the contract type is business power, and this electricity charge is the basic charge + power consumption Generally it is a charge. In this basic charge, the basic charge for the year is determined by the average maximum power (maximum demand power = demand) for 30 minutes at the peak of summer. Furthermore, it is normal for the provisions of electricity supply to include provisions that prevent demand from exceeding contracted power.

If the demand exceeds a predetermined ratio (for example, 104%) of the contract power, the basic charge is changed for 12 months immediately after that month, and the basic charge becomes high. In addition, because the contract power was exceeded, a surcharge will be collected for the excess. Also, if the number is repeatedly exceeded, the contract type may be requested to be changed.
From this point of view, it is necessary to keep demand low, at least that demand does not exceed contract power.

  Therefore, management that suppresses power is generally performed. For example, in the building management system, an increasing number of businesses and consumers are introducing energy management systems such as BEMS (Building and Energy Management System) and HEMS (Home Energy Management system), and these are beginning to become established.

  As conventional techniques of such a system for taking energy saving measures, for example, Patent Document 1 (Japanese Patent No. 3118376, “Air Conditioner”), Patent Document 2 (Japanese Patent Laid-Open No. 2003-279112, “Air Conditioning System and Concentration”). Controller "), Patent Document 3 (Japanese Patent Laid-Open No. 2006-038334," Energy Saving Control System for Multi-Air Conditioner ") and the like are known.

  In patent document 1, the air conditioner which reduces an air-conditioning load using fluctuation | variation for temperature setting is disclosed. Patent Document 2 discloses an air conditioning system in which fine control is performed by transmitting whether or not driving is permitted from a centralized controller to a local remote controller. Patent Document 3 discloses an energy saving control system for a multi air conditioner that takes energy saving measures such as efficiency improvement by grouping the multi air conditioners and performing operation control for each system.

Japanese Patent No. 3118376 JP 2003-279112 A JP 2006-038334 A

The systems that take energy saving measures in the above-mentioned Patent Documents 1, 2, and 3 are related to the entire air conditioning equipment including the arrangement of heat source equipment, piping, various sensors and control equipment, and generally have to be a large-scale system construction. It was.
Under such circumstances, on the customer side, in particular, from the viewpoint of energy saving measures, it is desired to realize an efficient system that can be easily installed.

  Therefore, the object of the present invention is not only for newly built buildings, but especially for businesses and customers who own buildings where old facilities remain, which improves ease of use and improves system construction workability. The purpose is to provide an energy saving control system that can maintain the contract type so that the demand does not exceed the contract power and can realize the energy saving operation according to the power consumption efficiently and at low cost. .

The energy saving control system according to claim 1 of the present invention is:
In a site that includes a master station building and multiple slave station buildings, multiple air conditioning systems installed in each zone of the master station building and multiple slave station buildings An energy saving control system for centralized management,
A transformer for power supply and demand meters installed in front of the power receiving equipment connected to the distribution lines on the premises and collectively measuring the power supplied to the premises,
An electric meter that outputs electric energy data for the entire site based on measurement data from a transformer for power supply and demand,
An overall demand monitoring unit that is installed in the master station building and monitors the entire demand within the site based on the electric energy data from the electric meter;
A current transformer for measuring the current supplied to the air conditioning equipment in each section;
WHM that outputs energy data based on current data from the current transformer;
A demand monitoring unit for each section that monitors demand based on electric energy data from the WHM and controls the air conditioning equipment for each section;
An overall demand monitoring section, a demand monitoring section for each section in each section, and a centralized management device connected to communicate with the air conditioning equipment in each section;
With
This centralized management device
Input means for inputting the monitoring result of the demand read from the overall demand monitoring unit and the demand of each section read from the demand monitoring unit for each section of each section;
When it is determined that the target level is exceeded according to the demand monitoring result in the overall demand monitoring unit, the air conditioning equipment in the division with high demand is lower based on the demand of each division from the demand monitoring unit by division in each division. A setting means for setting a target level and setting a lower target level for an air conditioner in a section with a large demand;
Transmitting means for transmitting the changed target level to the demand monitoring section for each section;
In addition, and
The demand monitor for each section is
Means to monitor demand and control air conditioning by section so as not to exceed the transmitted target level;
It is characterized by comprising.

Moreover, the energy saving control system according to claim 2 of the present invention includes:
The energy saving control system according to claim 1,
The air conditioning facility includes an auxiliary cooling device that forcibly sprinkles the outdoor unit,
The section-specific demand monitoring unit performs operation control of the air conditioning equipment so as to switch to the linked operation with the auxiliary cooling device when the demand calculated from the electric energy data exceeds a set first demand warning level. It functions as.

Moreover, the energy saving control system according to claim 3 of the present invention includes:
In the energy-saving control system of Claim 1 or Claim 2,
The air conditioning facility includes an auxiliary cooling device that forcibly sprinkles the outdoor unit,
The section-specific demand monitoring unit performs operation control of the air conditioning equipment so as to switch to the linked operation with the auxiliary cooling device when the demand calculated from the power amount data exceeds the set first demand warning level,
Further, when the second demand alarm level is exceeded, the auxiliary cooling device is stopped, and the air conditioner is monitored and controlled so as to switch to the forced schedule operation for performing the air blowing mode operation. It is characterized by suppressing the use of the amount of power.

Moreover, the energy saving control system according to claim 4 of the present invention includes:
In the energy-saving control system as described in any one of Claims 1-3,
An internal environment sensor connected to the demand monitoring unit for each compartment and measuring the environment of the air conditioning target in the compartment;
With
The section-specific demand monitoring unit includes means for registering standard set temperature data, means for calculating set temperature data for fluctuation and upper limit temperature data for fluctuation from the standard set temperature data, and fluctuation in room temperature from indoor temperature measurement data. And / or standard setting for air conditioner condition monitoring and operation control so that the temperature changes between the standard set temperature and the set temperature for fluctuation within a certain time without exceeding the upper limit temperature for use. Means for monitoring the state of the air conditioner and controlling the operation so that the set temperature different from the temperature returns to the standard set temperature after a set time has elapsed, and is characterized by suppressing the use of the electric energy of the air conditioner.

Moreover, the energy saving control system according to claim 5 of the present invention includes:
In the energy-saving control system as described in any one of Claims 1-3,
An internal environment sensor connected to the demand monitoring unit for each compartment and measuring the environment to be air-conditioned in the compartment;
An external environment sensor that is connected to the section-specific demand monitoring unit and measures the external environment;
With
The centralized management device switches to a means for calculating a discomfort index from the temperature measurement data and humidity measurement data of the outside air, and switches to a blowing mode operation that takes in the outside air when the discomfort index is within the set range, and the discomfort index falls within the set range. Means for monitoring the status of the air conditioning equipment and controlling the operation so as to switch the air conditioning equipment to the normal mode operation when there is not,
It is characterized by suppressing the use of electric energy of air conditioning equipment.

Moreover, the energy saving control system according to claim 6 of the present invention includes:
In the energy-saving control system as described in any one of Claims 1-5,
The centralized management device is configured to perform a forced schedule operation of a plurality of air conditioning facilities by group with respect to an air conditioning facility formed by connecting a plurality of outdoor units and a plurality of indoor units by refrigerant piping. It is characterized by suppressing the use of the electric energy of the air conditioning equipment by performing state monitoring and operation control of the air conditioning equipment so that the air conditioning equipment is sequentially switched to the forced schedule operation at set time intervals.

An energy saving control system according to claim 7 of the present invention is
The energy saving control system according to claim 6,
A remote control that commands the on / off of the air conditioning equipment by the user,
When the air-conditioning equipment that is forced-scheduled is instructed to be turned on from the remote controller during the off-time, the operation is stopped after the set time has elapsed, thereby suppressing the use of the electric energy of the air-conditioning equipment.

An energy saving control system according to claim 8 of the present invention is
In the energy-saving control system as described in any one of Claims 1-7,
The centralized management device is a computer having a Web server function and a database,
It is characterized in that the use of the electric energy of the air conditioning equipment is suppressed by performing state monitoring and operation control for each indoor unit or outdoor unit of each air conditioning equipment in accordance with a set schedule from a web browser of the computer.

  According to the present invention as described above, it is easy to introduce not only new buildings and the like, in particular, businesses and customers who own buildings where old facilities remain, improving usability, and workability of system construction To maintain the contract type so that the demand does not exceed the contract power, and to provide an energy-saving control system that can realize energy-saving operation according to the power consumption in an efficient and low-cost manner. it can.

  The energy-saving control system 1 of the present invention includes a master station building 10 and a plurality of slave station buildings 20 distributed in the site, and the master station building and the plurality of slave station buildings. This is an energy saving control system 1 that centrally manages a plurality of air conditioning facilities installed in each section in a centralized manner. As a precondition for operation, the power to be used in a facility with a large site is purchased from an electric power company in a lump, and power is supplied to the air conditioning equipment in each section of one master station building and multiple slave station buildings. The form is

  Such an energy saving control system 1 includes a plurality of air conditioning equipment 17 installed in each section of a single master station building 10 and a plurality of air conditioners 17 installed in each section of a plurality of dispersed slave station buildings 20. This is a system for measuring, monitoring, and controlling the air conditioning equipment 24. Hereinafter, the best mode for carrying out the energy saving control system 1 of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an energy saving control system according to this embodiment, and FIG. 2 is a diagram showing an installation example of air conditioning equipment in each section.

As shown in FIG. 1, the energy saving control system 1 includes a central management device 11, an electric meter 12, an overall demand monitoring unit 13, a CT 14, a WHM 15, a demand monitoring unit 16 for each section, and an air conditioning equipment 17 in the master station building 10. The slave station building 20 includes a CT 21, a WHM 22, a section-specific demand monitoring unit 23, and an air conditioning facility 24, and further includes an on-site network 30 and a monitoring computer 41.
Such an energy saving control system 1 is installed in an in-site power distribution system having a distribution line 50, a VCT 51, a power receiving facility 52, an in-site power line 53, a bus 54, a service line 55, and an in-compartment service line 56 (see FIG. 2).

As shown in FIG. 2, the master station building 10 and the plurality of slave station buildings 20 are further divided into a large number of sections, and air conditioning facilities and the like are installed in each section.
Specifically, when the section 101 of the master station building 10 is taken as an example, it includes a CT 141, a WHM 151, a section-specific demand monitoring unit 161, and an air conditioner 171. Further, in the air conditioner 171, an environmental sensor 171 a and a PAC (Package Air Conditioner) 171 b are installed. The same equipment as the above-described section 101 is installed in each of the many sections in the master station building 10.

  The same applies to the slave station building 20. When the section 201 of the slave station building 20 is taken as an example, a CT 211, a WHM 221, a section-specific demand monitoring unit 231, and an air conditioner 241 are provided. Further, the air conditioning equipment 241 is provided with a zone-specific environmental sensor 241a and a PAC 241b. And in each division of such a slave station building 20, the same equipment as the above-mentioned division 201 is installed.

Next, the on-site power distribution system in which the energy saving control system 1 is installed will be described with reference to FIG.
The power receiving facility 52 is connected to the distribution line 50 and receives the entire power supplied to the master station building 10 and the plurality of slave station buildings 20 in the site. The received power is supplied to the bus 54 via the on-site power line 53. A large number of lead-in lines 55 to be drawn into the master station building 10 and the plurality of slave station buildings 20 are connected to the bus 54. As shown in FIG. 2, a further intra-compartment service line 56 is connected to the service line 55. The intra-compartment lead-in line 56 is branched and drawn into the respective compartments 101 and 201 of the master station building 10 and the plurality of slave station buildings 20. Then, the PACs 171b and 241b in each section and the in-compartment lead-in line 56 are connected to supply power thereto.

A VCT (electric power supply / demand meter transformer) 51 is installed in the front stage of the power receiving facility 51 connected to the distribution line 50 to the site, and collectively measures the power supplied to the site.
The electric meter 12 is installed in the master station building 10 and outputs electric energy data for the entire site based on the measurement data from the VCT 51. The electric meter 12 is, for example, a transaction watt-hour meter (transaction WHM). Moreover, you may employ | adopt the structure which outputs the electric energy data by pulse data via a pulse transmitter.

  The overall demand monitoring unit 13 is installed in the master station building 10 and monitors the demand in the entire site based on the electric energy data from the electric meter 12. In demand monitoring, the predicted demand is calculated based on the power amount data, the calculated predicted demand is compared with the contract power stored in advance, and it is determined whether demand control is necessary. The overall demand monitoring unit 13 transmits a demand monitoring result or demand indicating whether demand control is necessary or not to the centralized management apparatus 11. Further, as a demand monitoring result, a demand control start command may be instructed to the centralized management apparatus 11. In this embodiment, the demand monitoring result is described as a demand control start command. Specific operations of the central management apparatus 11 will be described later.

  Next, the configuration installed in each section 101 of one master station building 10 and each section 201 of a plurality of slave station buildings 20 will be described. Here, a common configuration is installed in each of the sections 101 and 201, and in FIG. 2, the section 101 (201) is collectively described.

A CT (current transformer) 141 (211) measures the current supplied to the air conditioning equipment 171 (241) of each section connected to the intra-section lead-in line 56, and outputs current data.
The WHM (electric energy meter) 151 (221) outputs electric energy data based on the current data from the CT (current transformer) 141 (211). The WHM 151 (221) has a communication function, stores the measured value, and automatically reads meter reading information (power amount data) in response to a command command from the central management device 11 of the master station building 10. The information is transmitted to the section-specific demand monitoring unit 161 (231). If the measurement law is revised or special measures are taken in the future, the WHM 151 (221) will be equipped with a pulse oscillator, and pulses corresponding to the measured values will be output, accumulated and stored as meter reading values. Alternatively, meter reading information (power amount data) may be transmitted automatically or in response to a command command from the centralized management device 11 of the master station building 10 to directly convert the electricity charge.

  The section-specific demand monitoring unit 161 (231) monitors the section-specific demand based on the power amount data from the WHM 151 (221). In demand monitoring, a predicted demand is calculated based on power amount data, and the calculated predicted demand is compared with a preset power stored in advance to determine whether demand control is necessary. When necessary, a demand control start command is commanded to the air conditioning equipment 171 (241).

The air conditioning facility 171 (241) is a facility that performs air conditioning for each section. For example, it includes a compartmental environmental sensor 171a (241a) and a PAC 171b (241b).
The compartment-specific environmental sensor 171a (241a) is connected to the compartment-specific demand monitoring unit 161 (231), measures the environment inside and outside the compartment, and further includes an internal environment sensor and an external environment sensor.

An internal temperature sensor is an example of an internal environment sensor. This internal temperature sensor detects the temperature of the spatial environment in the installed compartment and transmits internal temperature measurement data. A plurality of internal temperature sensors may be connected to the section-specific demand monitoring unit 161 (231) to measure the internal temperature.
Moreover, an internal humidity sensor is mentioned as one of the internal environment sensors. The internal humidity sensor detects the humidity of the space environment in the installed section and transmits internal humidity measurement data. A plurality of internal humidity sensors may be connected to the section-specific demand monitoring unit 161 (231) to measure the internal humidity.

One example of the external environment sensor is an external temperature sensor. This external temperature sensor detects the temperature of the external environment and transmits external temperature measurement data. A plurality of external temperature sensors may be connected to the section-specific demand monitoring unit 161 (231) to measure the external temperature.
Moreover, an external humidity sensor is mentioned as one of the external environment sensors. The external humidity sensor detects the humidity of the external environment and transmits external humidity measurement data. It should be noted that a plurality of external humidity sensors may be connected to the section-specific demand monitoring unit 161 (231) to measure the external humidity.
The central management device 11 acquires external temperature measurement data and external humidity measurement data from an external supplier and transmits them to the demand monitor unit 161 (231) for each section, or an external environment sensor is connected to the central management device 11. The external environment sensor may be omitted by acquiring external temperature measurement data and external humidity measurement data and transmitting the external temperature measurement data and external humidity measurement data to the section-specific demand monitoring unit 161 (231).

  The PAC 171b (241b) is an air conditioning facility that supplies conditioned air for air conditioning (air conditioning) in the room. A chilled / hot water coil (heating / cooling) that adjusts the temperature and humidity of the air, the humidifier and the cleanliness of the air are adjusted. The air filter and the blower that blows the adjustment air are housed in an integrated casing. In order to adjust the temperature and humidity of the air, the heat source includes a refrigeration facility (compressor) and a DX coil (direct expansion coil). In addition, you may make it have an auxiliary | assistant cooling device which forcibly sprinkles an outdoor unit (after-mentioned). Note that the internal environmental sensor of the above-described environmental sensor 171a (241a) is a sensor built in the PAC 171b (241b).

  In one building, for example, the LON network (LON is an abbreviation for Local Operating Network, and a registered trademark of Echelon, USA) has a demand monitor unit 161 (231) and an air conditioner 171 ( 241) PAC 171b (241b) is connected. Here, the LON network is a bus connected to a single line from a gateway (not shown) that converts the communication protocol into a communication signal of LONTalk (registered trademark of Echelon, USA), and outputs it. The monitoring unit 161 (231) is connected to the PAC 171b (241b) of the air conditioning equipment 171 (241). This LON network configuration has an advantage that wiring can be facilitated because a large number of devices can be bus-connected to one line, and is particularly convenient when connecting to each section of a building. The above-described communication method is an example, and is not particularly limited to the LON method.

  A centralized management device 11 that centrally manages these devices is a main computer installed in a management room or the like of the master station building 10. This centralized management apparatus 11 is connected to a site network 30, an overall demand monitoring unit 13, a section-specific demand monitoring unit 16 installed in each section 101 in the master station building 10, and an air conditioner 17.

In the master station building of FIG. 1, the centralized management apparatus 11 is connected to a gateway (not shown) via a LAN line such as a normal Ethernet (registered trademark) system, and this gateway is connected to the LON network. The demand monitoring unit 16 for each section and the air conditioning equipment 17 installed in each section 101 in the master station building 10 are connected to the network.
Further, in the master station building of FIG. 1, the centralized management apparatus 11 is connected to the overall demand monitoring unit 13 via a LAN line such as a normal Ethernet (registered trademark) system. In addition, you may make it connect the electric meter 12 and the whole demand monitoring part 13 through the site network 30 as mentioned above in another location.

  In the slave station building of FIG. 1, the centralized management apparatus 11 is connected to the on-site network 30. The on-site network 30 is a backbone communication line using an optical cable, for example. In this case, the centralized management apparatus 11 is connected to a router (not shown) functioning as a media converter via a LAN line such as a normal Ethernet (registered trademark) system, connected to the on-site network 30, and connected to the slave station building. 20 is connected to a router (not shown) functioning as a media converter and gateway on the 20 side, this router is connected to the LON network, and the demand monitoring unit for each partition installed in each partition 201 in the slave station building 20 is connected to the LON network. 23, air conditioning equipment 24 is connected.

  The on-site network 30 is a method capable of long-distance communication as a communication method, and for example, the RS485 method may be adopted.

  The external monitoring computer 41 is connected to the in-site network 30 so as to obtain various information. In this case, when the external monitoring computer 41 is in another location outside the site, it is connected via a public line.

In such an energy saving control system 1 of the present invention, demand control for the air conditioning equipment for each section, demand control for the air conditioning equipment for the entire site, and information processing by the information system are performed.
First, the demand control about the air conditioning equipment for each section will be described. The section-specific demand monitoring unit 161 (231) measures the current demand obtained by integrating the instantaneous power up to the present based on the current instantaneous power obtained via the CT 141 (211) and the WHM 151 (221).

  Based on the current demand, the predicted demand is calculated from the past data increase / decrease result. Specifically, as shown in the predicted demand calculation explanatory diagram of FIG. 3, the integrated power for 30 minutes is measured. The demand itself is an average value for 30 minutes of instantaneous power consumed by a consumer, but is predicted with integrated power at the time of prediction. In this case, assuming that the predicted demand PF, the current demand P, the predetermined period (30 minutes) T, the current time t, and the slope Δp / Δt, the predicted demand PF is expressed by the following equation.

(Equation 1)
PF = P + (T−t) · Δp / Δt

  As apparent from the graph shown in FIG. 3, the calculated predicted demand PF is compared with the contract level stored in advance, and if the predicted demand PF exceeds the contract level, the contract level is set. Demand control is performed so as not to exceed. A target level that is lower than the contract level is set, and when the predicted demand PF exceeds the target level, demand control is performed so that the target level does not exceed the target level, so as not to exceed the contract level. May be. In this embodiment, the following description will be made assuming that the target level is set.

Next, a specific example of demand control will be described.
For example, as shown in FIG. 4, the section-specific demand monitoring unit 161 (231) calculates a predicted demand at a certain point of time, compares and determines the target level for each preset time and the predicted level, If the predicted demand is likely to exceed the target level, the target level is changed to be lowered, and the demand control command command determined based on this change is output to the PAC 171b (241b) of the air conditioning equipment 171 (241). The PAC 171b (241b) of the air conditioning equipment 171 (241) performs control so as not to exceed the target power based on the input demand control command command. Note that the data and demand for the new target level are transmitted to the central management apparatus 11 to be the latest information. Details of the control will be described later.

  Further, as shown in FIG. 5, there may be a case where the target is achieved by being controlled a plurality of times along the way. For example, demand control of control 1 and control 2 is performed. As a result of such demand control, the increase amount of the current demand becomes small as shown in FIG. As a result, the target is expected to be achieved, so that if the demand changes as predicted, further demand control will not be performed. In this case as well, the new target level and demand are transmitted to the central management apparatus 11. Details of the control will be described later.

  Next, demand control for the air conditioning equipment in the entire site will be described. In other words, this is demand control by the energy saving control system 1 as a whole. The overall demand monitoring unit 13 measures the current demand obtained by integrating the instantaneous power up to the present based on the current instantaneous power obtained through the VCT 51 and the electric meter 12. Based on the current demand, as described above with reference to FIG. 3, the predicted demand is calculated from the past data increase / decrease result. Then, the calculated predicted demand PF is compared with the contract level set and stored in advance, and when the predicted demand PF exceeds the target level set as a whole, demand control is performed.

  For example, as shown in FIG. 4, the overall demand monitoring unit 13 calculates a predicted demand at a certain point of time, compares and determines a target level for each time set in advance and stored, and the predicted demand is a target. When the level is likely to be exceeded, the target level is changed to be lowered, and the new target level and demand determined based on this change are output to the centralized management apparatus 11.

  The central management apparatus 11 registers the input overall target level and starts changing the target level for each section. At the time of this change, it is assumed that the latest target level is transmitted from the section-specific demand monitoring unit 161 (231) of each section 101 (201). The centralized management device 11 sets a lower target level for the air conditioning equipment of a section with a large demand based on the demand of each section from the demand monitoring unit for each section of each section, and sets the air conditioning equipment for a section with a large demand. Sets a lower target level. Then, the centralized management apparatus 11 transmits the target level for each section to the demand monitor for each section of each section. As a result, power is demand-controlled so as not to exceed the target power in each section.

  Further, as shown in FIG. 5, when the target is achieved multiple times in the middle, for example, demand control of control 1 and control 2 is performed. As a result of such demand control, the increase amount of the current demand becomes small as shown in FIG. As a result, the target is expected to be achieved, and no further demand control is performed.

  In such an energy saving control system 1 of this embodiment, the power consumption is reduced to the target level, so that the power consumption can be reliably reduced. In addition, because demand control for each section and demand control for the entire site are performed, double demand control is performed in sections with large demand, resulting in fair demand control as a whole, and demand is contracted. Avoid as much as possible the situation of exceeding electric power.

Next, information processing by the information system will be described.
The centralized management device 11 is a computer having a Web server function and a database, and performs state monitoring and operation control for each indoor unit or outdoor unit of each air conditioning facility through a Web browser of the computer in accordance with a setting schedule, whereby the power of the air conditioning facility It is possible to suppress the use of the amount. It is also possible to monitor demand through a Web browser. For example, the state of demand control may be monitored from a demand monitoring screen as shown in FIG. In addition, including operation control functions, equipment monitoring (monitoring of various equipment, temperature / humidity status monitoring, display, etc.), history management (equipment start / stop time, alarm occurrence, recovery time recording, display, etc.), Trend display (graph display of collected data over time, etc.), daily / monthly report creation management (created and displayed collected data as daily / monthly report, etc.), demand monitoring control (graph display of power consumption based on power data and power Demand forecasting, load control not to exceed contract power, etc.) and other various setting functions, the details of which are omitted.

The centralized management apparatus 11 collects and analyzes these data and collectively stores them as file data.
As an example of file data, for example, file data in CSV format in which measurement data is arranged in time series may be transmitted by downloading to the monitoring computer 41 of the monitoring station building 40 inside or outside the site by FTP. good. Alternatively, the file data may be transmitted as a web data such as HTML data or XML data by browsing using a web browser of the monitoring computer 41 by HTTP.

  As another example of file data, file data in a form format such as Excel (registered trademark) may be used. In this case, the centralized management apparatus 11 includes spreadsheet software that converts measurement data into file data in a form format, and can collect, analyze, and aggregate various measurement data at once, and analyze the collected measurement data.・ Aggregate and save as form file data. This software operates as a Windows (registered trademark) program. The file data may be transmitted by downloading to the monitoring computer 41 by FTP. Alternatively, the file data may be transmitted as Web data such as HTML data or XML data by browsing with a Web browser on the monitoring computer 41 by HTTP.

  Next, details of demand monitoring and demand control for each section will be described. For air conditioner status monitoring and operation control, individual functions are added to save energy while reducing discomfort. Such a function will be described with reference to the drawings. FIG. 7 is an explanatory diagram of an auxiliary cooling device for an outdoor unit, and FIG. 8 is an explanatory diagram of demand control using the auxiliary cooling device. The power demand is used as an index, and management is performed using an auxiliary cooling device that sprays water to the outdoor unit. The auxiliary cooling device 70 of the outdoor unit 61 has a built-in watering device. The watering device has a nozzle 71 for spraying water on the heat exchanger 62 of the outdoor unit 61 and the nozzle 71 as shown in FIG. Is attached to the outdoor unit 61 and is attachable to and detachable from the outdoor unit 61.

  The auxiliary cooling device 70 has a control unit (not shown) that controls the amount of water supplied to the nozzle 71 in stages, and the amount of water supplied is controlled by a control command from the section-specific demand monitoring unit 161 (231). In addition, the water supply amount data for this water supply is acquired. The section-specific demand monitoring unit 161 (231) measures the amount of power supplied to the air conditioning equipment through the section lead-in line 56 through the CT 141 (211) and the WHM 151 (221), and the demand for each section is determined from these power amount measurement data. Calculate the value. Then, demand control is performed for each section of each of the buildings of the plurality of buildings.

  Assuming that a demand value as shown in FIG. 8 is obtained for a certain section, the section-specific demand monitoring unit 161 (231) first determines that the PAC 171b (241b) when the set first demand alarm level is exceeded. ) Is switched to linked operation with the auxiliary cooling device 70. In addition to centralized management by demand control, a command to start cooling is output to the auxiliary cooling device 70 to the control unit of the sprinkler of the outdoor unit. The PAC 171b (241b) status monitoring and operation control function as well as a forced watering command. The controller of the auxiliary cooling device 70 sprays water intermittently from the nozzle 71 in accordance with the command. As is apparent from FIG. 8, the tendency of the demand to increase during watering is suppressed, and a situation in which the demand immediately exceeds the upper limit is avoided.

  In addition, when the demand exceeds the set first warning level and further exceeds the second warning level, the section-specific demand monitoring unit 161 (231) stops the operation of the auxiliary cooling device 70 and PAC 171b (241b). It functions as a means for monitoring the state of the air conditioning equipment and controlling the operation so as to switch to the forced schedule operation that switches the indoor unit to the blow mode operation. As is apparent from FIG. 8, the tendency of the demand value to increase is suppressed during the air blowing mode operation, and a situation in which the demand immediately exceeds the upper limit is avoided.

  In the energy saving control system 1, it is assumed that a plurality of air conditioning facilities are grouped in advance in the centralized management device 11 and registered in the demand monitoring unit 161 (231) for each section so that the forced schedule operation is performed for each group. According to the demand control command command from the device 11, the section-specific demand monitoring unit 161 (231) may monitor the state of the air conditioning equipment and control the operation so that each group is sequentially forcedly scheduled with a set time interval. good. For example, in this embodiment, one PACPAC 171b (241b) is made into one group, and the PAC1, A PAC2, and the PAC3 C in FIG. 1 are sequentially switched to the air blowing mode, so that the demand increase rate is suppressed. The setting is not exceeded. By performing these controls, the effect that the demand falls within the set range can be obtained. Such an energy saving control system 1 may be used.

  Next, other functions will be described with reference to the drawings. FIG. 9 is an explanatory diagram of PAC centralized control using the indoor temperature as an index using fluctuation control together. In addition to the above-described embodiments described above, the following functions are further provided. In this fluctuation control, the room temperature is measured, and the set temperature is changed frequently by automatic control to save energy. When the measured temperature reaches the standard set temperature during package air conditioner operation, the set temperature is raised to the set temperature for fluctuation after the set time has elapsed during cooling. However, an upper limit temperature for fluctuation is provided so as not to exceed the upper limit temperature. After the measured temperature reaches the set temperature for fluctuation, the set temperature is returned to the standard temperature after the set recovery time has elapsed. Conversely, during heating operation, setting control is performed to lower the fluctuation set temperature. The outline of the process is like this.

First, the section-specific demand monitoring unit 161 (231) functions as means for registering standard set temperature data. In FIG. 9, it is set to 24 ° C.
The section-specific demand monitoring unit 161 (231) functions as means for calculating the set temperature data for fluctuation and the upper limit temperature data for fluctuation from the standard set temperature data. In FIG. 9, the fluctuation set temperature is set to + 2 ° C., 26 ° C. from the standard set temperature data, and the fluctuation upper limit temperature is set to + 4 ° C., 28 ° C., from the standard set temperature data.
The compartment-specific demand monitoring unit 161 (231) changes a minute temperature between the standard set temperature and the set temperature for fluctuation for every predetermined time while preventing the room temperature from exceeding the upper limit temperature for fluctuation from the indoor temperature measurement data. Thus, the PAC 171b (241b) functions as a means for performing state monitoring and on / off contact operation control.
By doing in this way, energy saving can be aimed at.

Next, other functions will be described with reference to the drawings. FIG. 10 is an explanatory diagram of PAC centralized control using the standard temperature control and the indoor temperature as an index. In addition to the above-described embodiments described above, the following functions are further provided. In this standard temperature control, when the room temperature is measured and the set temperature is forcibly set to the standard temperature or less by remote control operation, the set temperature can be temporarily changed rapidly. When the time (for example, 20 minutes) elapses, the set temperature itself is automatically returned to the standard set temperature to save energy.
In contrast, during heating operation, the set temperature can be temporarily changed rapidly, but when the set time has elapsed, the set temperature itself is automatically returned to the standard set temperature. The outline of the process is like this.

  Next, other functions will be described with reference to the drawings. FIG. 11 is an explanatory diagram of PAC centralized control using the outside air temperature and the outside air humidity. In addition to the above-described embodiments described above, the following functions are further provided. Here, an external temperature sensor is installed outdoors and outputs temperature measurement data of outside air, and an external humidity sensor is installed outdoors and outputs humidity measurement data of outside air. To do. FIG. 10 shows PAC status monitoring and operation control. The discomfort index of the outside air is calculated from the outside air temperature and the outside air humidity, and the outside air is taken in from the discomfort index when it is a condition that a person feels comfortable, that is, when the outside air is more comfortable than the room Make air conditioning operational. Under comfortable conditions, the PAC is changed to the air blowing mode.

  Here, the discomfort index is an index that quantitatively represents the heat of summer and is given by the following equation.

(Equation 2)
Discomfort index (DI) = 0.81T + 0.01U (0.99T-14.3) +46.3
T: Outside air temperature (° C)
U: Relative humidity of outside air (%)

  The discomfort index and the body temperature are as follows. Less than 55, cold at 55-60, chilly at 60-65, no feeling at 60-65, pleasant at 65-70, not hot at 70-75, slightly hot at 75-80, 80-85 hot and sweaty, 85 That's why it's hot and irresistible. It is said that 10% of the population becomes uncomfortable when the discomfort index exceeds 75, and everyone becomes uncomfortable when it exceeds 80.

First, the section-specific demand monitoring unit 161 (231) functions as means for calculating the discomfort index from the temperature measurement data and humidity measurement data of the outside air.
When the discomfort index is within the set range, for example, when the discomfort index is 60 to 75 with the above numerical value, the section-specific demand monitoring unit 161 (231) switches the air-conditioning equipment to the air blowing mode operation that takes in outside air. When the air conditioner is not in the set range, for example, when the discomfort index exceeds 75 or the discomfort index falls below 60, the air conditioner state monitoring and on / off contact operation control are performed so that the air conditioner is switched to the normal mode operation. Functions as a means.

  Here, from the outside air temperature and outside air humidity, the section-specific demand monitoring unit 161 (231) determines whether control is possible, transmits a control signal to the terminal device of each building, and changes the PAC 171b (241b) to the air blowing mode.

  Next, other functions will be described with reference to the drawings. FIG. 12 is an explanatory diagram of alarm centralized control based on a time setting schedule as automatic stop cancellation control. In addition to the above-described embodiments described above, the following functions are further provided. FIG. 12 shows the state monitoring and operation control of the alarm central control. For the purpose of saving energy by preventing the user from forgetting to turn off the PAC 171b (241b), control is performed by setting the automatic stop time and the schedule time setting for releasing the operation of the local remote controller. The PAC 171b (241b) can be turned on / off (On: automatic stop cancellation, Off: stop (on / off at most 3 times a day)) by setting a schedule at a specified time in each remote control unit in each section. The schedule can be set for each group. If an operation command is issued by the local remote controller during the off time, the operation stops after the set time has elapsed. This function allows time setting separately for each group after the first operation and after the second and subsequent operations.

Note that the section-specific demand monitoring unit 161 (231) in this embodiment is mainly intended for monitoring and operating control of a packaged air conditioner operation formed by connecting an outdoor unit and an indoor unit with a refrigerant pipe. Items and management types mainly include power consumption, power demand, temperature, and humidity, but as necessary, CO ₂ concentration measurement, fire detection, lighting monitoring and control, air handling unit on / off, The start and stop of the fan coil unit, the monitoring and control of the valve, the measurement of the heat amount, the monitoring and control of the damper, the chiller unit, the measurement of the water temperature in the heat storage tank, and the like may be expanded and provided as necessary.

The energy saving control system 1 of the present invention has been described above.
The unit of air conditioning was explained as a section partitioned by a wall called a cold room such as a room, laboratory, or conference room, but there are corridors, entrances, etc. in the master station building and the slave station building. It is a concept that includes these. Since the corridor and the entrance are wide spaces, a large number of air conditioning facilities may be arranged so that the space in the vicinity of the air conditioning facilities can be operated as a single section.

  In this way, by collecting the air conditioner contact operation data from the air conditioner condition monitoring and operation control sensor together with the electric energy measurement data and the environment measurement data, fluctuation control, while enabling efficient operation of the air conditioner, Additional functions, such as a ventilation mode and outdoor unit watering, are provided for further energy saving. And it makes it easy to construct | assemble the energy saving control system 1 of this invention, such as the installation work reduction of communication lines, and existing building air-conditioning equipment correspondence.

  By such an energy saving control system 1 of the present invention, it is easy to introduce not only new buildings but also businesses and customers who own buildings where old facilities remain, improving usability and system construction. As a result, the energy saving operation of the air conditioning equipment having a large power consumption ratio can be realized efficiently and at low cost.

It is the schematic of the energy saving control system of the best form for implementing this invention. It is a figure which shows the example of installation of the air-conditioning equipment in each division. It is prediction demand calculation explanatory drawing. It is explanatory drawing of demand control. It is explanatory drawing of other demand control. It is explanatory drawing of a display screen. It is explanatory drawing of the auxiliary | assistant cooling device for outdoor units. It is explanatory drawing of the demand control using an auxiliary cooling device. It is explanatory drawing of PAC centralized control which uses indoor temperature as a parameter | index using fluctuation control together. It is explanatory drawing of PAC centralized control which uses indoor temperature as a parameter | index using automatic temperature control together. It is explanatory drawing of the centralized control of PAC using outside temperature and outside air humidity. It is explanatory drawing of alarm centralized control by a time setting schedule as automatic stop cancellation | release control.

Explanation of symbols

1: Energy saving control system 10: Master station building 11: Centralized control device 12: Electric meter 13: Overall demand monitoring unit 14, 141: CT
15,151: WHM
16, 161: Demand monitoring section 17, 171: Air conditioning equipment 171 a: Environmental sensor 171 b: PAC
20: Slave station building 21, 211: CT
22,221: WHM
23, 231: Demand monitor unit 24, 241: Air conditioning equipment 241a: Environmental sensor 241b: PAC
30: On-site network 40: Monitoring station building 41: Monitoring computer 50: Distribution line 51: VCT
52: Power receiving equipment 53: On-site power line 54: Bus 55: Service line 56: In-compartment service line 61: Outdoor unit 62: Heat exchanger 70: Auxiliary cooling device 71: Nozzle 72: Mounting frame

Claims (8)

In a site that includes a master station building and multiple slave station buildings, multiple air conditioning systems installed in each zone of the master station building and multiple slave station buildings An energy saving control system for centralized management,
A transformer for power supply and demand meters installed in front of the power receiving equipment connected to the distribution lines on the premises and collectively measuring the power supplied to the premises,
An electric meter that outputs electric energy data for the entire site based on measurement data from a transformer for power supply and demand,
An overall demand monitoring unit that is installed in the master station building and monitors the entire demand within the site based on the electric energy data from the electric meter;
A current transformer for measuring the current supplied to the air conditioning equipment in each section;
WHM that outputs energy data based on current data from the current transformer;
A demand monitoring unit for each section that monitors demand based on electric energy data from the WHM and controls the air conditioning equipment for each section;
An overall demand monitoring section, a demand monitoring section for each section in each section, and a centralized management device connected to communicate with the air conditioning equipment in each section;
With
This centralized management device
An input means for inputting the demand in the entire site and the demand in each section read from the demand monitoring section in each section, the entire demand monitoring section;
If it is determined that the demand warning level will be exceeded based on the demand on the entire site, the air conditioning equipment in the section with high demand based on the demand of each section from the demand monitor for each section in each section will have a lower target. Setting means for setting a level and setting a lower target level for an air conditioner in a section with high demand;
Transmitting means for transmitting the changed target level to the demand monitoring section for each section;
In addition, and
The demand monitor for each section is
Means to monitor demand and control air conditioning by section so as not to exceed the transmitted target level;
An energy saving control system characterized by comprising: The energy saving control system according to claim 1,
The air conditioning facility includes an auxiliary cooling device that forcibly sprinkles the outdoor unit,
The section-specific demand monitoring unit performs operation control of the air conditioning equipment so as to switch to the linked operation with the auxiliary cooling device when the demand calculated from the electric energy data exceeds a set first demand warning level. Energy-saving control system characterized by functioning as In the energy-saving control system of Claim 1 or Claim 2,
The air conditioning facility includes an auxiliary cooling device that forcibly sprinkles the outdoor unit,
The section-specific demand monitoring unit performs operation control of the air conditioning equipment so as to switch to the linked operation with the auxiliary cooling device when the demand calculated from the power amount data exceeds the set first demand warning level,
Further, when the second demand alarm level is exceeded, the auxiliary cooling device is stopped, and the air conditioner is monitored and controlled so as to switch to the forced schedule operation for performing the air blowing mode operation. An energy-saving control system characterized by suppressing the use of electric power. In the energy-saving control system as described in any one of Claims 1-3,
An internal environment sensor connected to the demand monitoring unit for each compartment and measuring the environment of the air conditioning target in the compartment;
With
The section-specific demand monitoring unit includes means for registering standard set temperature data, means for calculating set temperature data for fluctuation and upper limit temperature data for fluctuation from the standard set temperature data, and fluctuation in room temperature from indoor temperature measurement data. And / or standard setting for air conditioner condition monitoring and operation control so that the temperature changes between the standard set temperature and the set temperature for fluctuation within a certain time without exceeding the upper limit temperature for use. Means for monitoring the condition of the air conditioning equipment and controlling the operation so that the preset temperature different from the temperature returns to the standard temperature after the set time has elapsed, and is designed to suppress the use of electric energy in the air conditioning equipment Control system. In the energy-saving control system as described in any one of Claims 1-3,
An internal environment sensor connected to the demand monitoring unit for each compartment and measuring the environment to be air-conditioned in the compartment;
An external environment sensor that is connected to the section-specific demand monitoring unit and measures the external environment;
With
The centralized management device switches to a means for calculating a discomfort index from the temperature measurement data and humidity measurement data of the outside air, and switches to a blowing mode operation that takes in the outside air when the discomfort index is within the set range, Means for monitoring the status of the air conditioning equipment and controlling the operation so as to switch the air conditioning equipment to the normal mode operation when there is not,
An energy-saving control system that suppresses the use of electric energy for air conditioning equipment. In the energy-saving control system as described in any one of Claims 1-5,
The centralized management device is configured to perform a forced schedule operation of a plurality of air conditioning facilities by group with respect to an air conditioning facility formed by connecting a plurality of outdoor units and a plurality of indoor units by refrigerant piping. An energy-saving control system that suppresses the use of electric energy of an air-conditioning facility by performing state monitoring and operation control of the air-conditioning facility so that the air-conditioning facility sequentially switches to a forced schedule operation at set time intervals. The energy saving control system according to claim 6,
A remote control that commands the on / off of the air conditioning equipment by the user,
An energy-saving control system that suppresses the use of electric energy for air-conditioning equipment by stopping the operation after the set time has elapsed when an air-conditioning equipment that is forcibly scheduled is commanded to be turned on by a remote controller during the off-time . In the energy-saving control system as described in any one of Claims 1-7,
The centralized management device is a computer having a Web server function and a database,
An energy-saving control system that suppresses the use of electric energy of an air conditioning facility by performing state monitoring and operation control for each indoor unit or outdoor unit of each air conditioning facility according to a setting schedule from a web browser of a computer.

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