KR20130117117A - Device and method for controlling inlet temperature of cooling water in network operating center building energy management system - Google Patents

Device and method for controlling inlet temperature of cooling water in network operating center building energy management system Download PDF

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KR20130117117A
KR20130117117A KR1020120039875A KR20120039875A KR20130117117A KR 20130117117 A KR20130117117 A KR 20130117117A KR 1020120039875 A KR1020120039875 A KR 1020120039875A KR 20120039875 A KR20120039875 A KR 20120039875A KR 20130117117 A KR20130117117 A KR 20130117117A
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supply temperature
cooling water
water supply
refrigerator
value
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KR1020120039875A
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Korean (ko)
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유병천
박현주
하호성
유응재
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에스케이텔레콤 주식회사
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/10—Services
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24065—Real time diagnostics

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Abstract

The present invention relates to an apparatus and method for controlling temperature of cooling water supply in a building energy management system for improving energy use efficiency while maintaining a pleasant indoor environment of a building by changing a cooling water supply temperature of a building chiller. Check the coolant supply temperature lower limit of the freezer, analyze the trend of statistical data of the freezer system, and determine whether to change the coolant supply temperature of the freezer by using the coolant supply temperature lower limit and the coolant supply temperature measurement of the freezer. When the cooling water supply temperature of the refrigerator needs to be changed, after performing the control for changing the cooling water supply temperature of the refrigerator by using the real-time monitoring information obtained through monitoring by the monitoring unit and the analyzed statistical data, real-time monitoring Information By confirming the energy saving results by analyzing, there is an effect that can reduce the energy consumption by changing the cooling water supply temperature of the freezer even in the medium and light loads.

Description

Device and method for controlling inlet temperature of cooling water in Network Operating Center Building Energy Management System

The present invention relates to a building energy management system, and more particularly, to an apparatus and method for controlling temperature of a cooling water supply in a building energy management system for improving energy use efficiency while maintaining a pleasant indoor environment of a building by changing a cooling water supply temperature of a building freezer. It is about.

In Korea, which is highly dependent on the supply and demand of energy resources, the consumption of imported energy does not decrease even in the period of very high oil prices. In view of these circumstances, technology development and application of energy saving in the building sector is considered as a very important field among energy consumption fields.

Efficient use of energy in buildings is an important factor that has a direct impact on landlords and the national infrastructure industry.

In particular, unreasonable energy use in buildings is also associated with inefficient operation and management of the facilities in the building. For example, 20% of the summer's electricity demand is the share of cooling load in the building's total load, indicating that cooling load has a significant effect on peak power and power reserves. Occupies. Energy saving methods in such buildings include architectural planning approaches and facility approaches that improve the operating efficiency of energy-using devices and systems. Among these approaches, in the field of facilities, it is required to create a proper environment and to design energy consumption and environmental conservation and to operate an efficient facility system.

Accordingly, the present invention has been proposed to solve the conventional inconvenience, the cooling water supply temperature control device for changing the cooling water supply temperature to collect and analyze data on the condition of the refrigerator and cooling tower in the building remotely from the building energy management system And to provide a method.

Cooling water supply temperature control device in the building energy management system of the present invention for achieving the above object, the monitoring unit for monitoring the refrigerator system in real time; And analyzing trends of statistical data of the freezer system, determining whether the coolant supply temperature of the freezer is changed by using a preset coolant supply temperature lower limit value and a measured value of the coolant supply temperature of the freezer, and changing the coolant supply temperature of the freezer. Cooling water supply temperature control device in a building energy management system comprising a control unit for performing a control for changing the cooling water supply temperature of the refrigerator by using the real-time monitoring information and the analyzed statistical data obtained through monitoring in the monitoring unit .

In addition, the cooling water supply temperature control apparatus in the building energy management system of the present invention for achieving the above object, the cooling water supply temperature lower limit value, cooling water supply temperature measurement value, statistical data, the main monitoring items, monitoring information and cooling water supply The apparatus may further include a storage unit which stores one or more of information for temperature control.

In the cooling water supply temperature control apparatus in the building energy management system of the present invention, when an alarm occurs due to an abnormal operation of the refrigerator system, the controller performs control for changing the cooling water supply temperature of the refrigerator again.

In the cooling water supply temperature control apparatus in the building energy management system of the present invention, the control unit, after changing the cooling water supply temperature of the refrigerator, analyzes the monitoring information obtained by monitoring the refrigerator system to confirm the energy saving result.

In the cooling water supply temperature control apparatus in the building energy management system of the present invention, the control unit analyzes the trend of the statistical data, checks the past cold prevention water and the refrigerator power consumption, grasps the application period, and determines the trend of the statistical data for each period. Analyze and check for abnormalities in the freezer. Cold-prevented water is obtained by subtracting the preset temperature from the daily average temperature value obtained by adding the maximum temperature and the minimum temperature to 2, and calculating the value as 0 for the day when the average daily temperature is below the preset temperature.

In the cooling water supply temperature control apparatus in the building energy management system of the present invention, the control unit applies preset basic data of the refrigerator system to the simulation, derives the first control value through simulation according to environmental variables, and statistical data. The second control value is set by correcting the first control value using, and after changing the cooling water supply temperature of the freezer to the set second control value, the second control value according to the monitoring information obtained through real-time monitoring of the refrigerator system. The final control value is set by correcting and the control for changing the cooling water supply temperature of the refrigerator is performed.

In the cooling water supply temperature control device in the building energy management system of the present invention, the control unit compares the cooling water supply temperature measurement value with the cooling water supply temperature lower limit value of the refrigerator, and when the cooling water supply temperature measurement value is larger than the cooling water supply temperature lower limit value, the cooling water is used. Change the supply temperature.

Cooling water supply temperature control method in the building energy management system of the present invention for achieving the above object, the step of checking the lower limit of the cooling water supply temperature of the pre-set refrigerator; Monitoring the freezer system in real time; Analyzing the trend of statistical data of the freezer system; Comparing the coolant supply temperature lower limit value and the coolant supply temperature measurement value to determine whether the coolant supply temperature is changed in the freezer, and when the coolant supply temperature of the freezer is required to be changed, the cooling water supply temperature of the freezer using the monitoring information and analyzed statistical data. Performing control to change the.

In addition, the cooling water supply temperature control method in the building energy management system of the present invention for achieving the above object, the step of checking whether the alarm occurs according to the abnormal operation of the refrigerator system; And when the alarm occurs, performing control for changing the coolant supply temperature of the refrigerator again.

Cooling water supply temperature control method in the building energy management system of the present invention for achieving the above object, the step of confirming the energy saving results by analyzing the monitoring information obtained by monitoring the refrigeration system after the cooling water supply temperature of the refrigerator is changed; It further includes.

In the method for changing the coolant supply temperature lower limit in the building energy management system of the present invention, analyzing the trend of the statistical data of the freezer includes: identifying past cold water; Identifying a freezer power consumption; And identifying the application period of the control for changing the cooling water supply temperature by applying the identified cold prevention water and the freezer power consumption.

In the method of controlling the cooling water supply temperature in the building energy management system of the present invention, the performing of the control for changing the cooling water supply temperature of the refrigerator includes applying preset basic data of the refrigerator system to the simulation and performing simulation according to environmental variables. Deriving a first control value through; Correcting the first control value using statistical data to set a second control value; Changing the cold water supply temperature of the freezer to the set second control value; Correcting the second control value according to the monitoring information obtained through real-time monitoring of the refrigerator system to set a final control value and performing control for changing the coolant supply temperature of the refrigerator to the final control value.

The present invention can reduce the power consumption of the refrigerator by improving the efficiency of the refrigerator by lowering the setting of the cooling water supply temperature, it is possible to reduce the energy consumption by operating the refrigerator system efficiently.

In addition, the present invention can improve the efficiency of the refrigerator by lowering the cooling water supply temperature when the cooling load is light load or cooling is required even in the winter or mid-term, thereby saving energy.

1 is a block diagram showing the structure of a general refrigerator system.
2 is a block diagram illustrating a structure of a cooling water supply temperature control device of a refrigerator in a building energy management system according to an exemplary embodiment of the present invention.
3 is a flowchart illustrating a method for controlling a cooling water supply temperature of a refrigerator in a building energy management system according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

Prior to the explanation, the Network Operating Center Building Energy Management System (NOC BEMS) is a system for improving energy performance while maintaining a pleasant indoor environment in a building. In addition, it analyzes energy usage and analyzes environment variables according to time zones and provides energy saving services to save building energy.

Hereinafter, an embodiment of the present invention will be described an apparatus and method for controlling the cooling water supply temperature of the refrigerator while monitoring and automatically controlling the operating state of the refrigerator system among various equipment systems in the building in the building energy management system.

 First, referring to FIG. 1 attached to the refrigerator system, the refrigerator system 10 may include a refrigerator 11, a cooling tower 12, a coolant flow meter 13, a coolant pump 14, and the like. According to the cooling water supply temperature control of the energy management system, the chiller cooling water supply temperature may be adjusted by an administrator to maintain a comfortable environment in the room. As the cooling water supply temperature is lower, the efficiency of the refrigerator is improved. Therefore, when the cooling load is a light load, the energy consumption of the refrigerator can be reduced by lowering the cooling water supply temperature setting (higher the cooling efficiency). Here, the cooling water supply temperature may lower the temperature to a result of analysis by analyzing statistical data of power consumption of the cooling tower 12 and power consumption of the refrigerator 11.

In addition, the building energy management system monitors the operating state of the refrigerator system 10 while cooling water supply / return temperature of the refrigerator 11, cold water supply / return temperature, cooling water flow rate, power consumption of the cooling tower 12, power of the cooling water pump, and the like. The consumption amount and the power consumption amount of the refrigerator 11 can be monitored. Here, the cooling water supply temperature for controlling in the embodiment of the present invention refers to the temperature of the cooling water received from the cooling tower 13 via the cooling water flow meter 13 and the cooling water pump 14 based on the refrigerator 11.

On the other hand, prior to the cooling water supply temperature control, the manager examines the cooling water lower limit temperature management index of the refrigerator 11 in the refrigerator system 10, and the cooling water lower limit temperature (cooling water supply temperature lower limit value) of the refrigerator 11 being managed and Review the current operating coolant supply temperature setpoint. Here, the coolant lower limit temperature can be checked through the specifications provided by the refrigerator manufacturer.

Next, a structure of a cooling water supply temperature control device in a building energy management system for controlling a cooling water supply temperature of a refrigerator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, the cooling water supply temperature control according to the embodiment of the present invention can be applied regardless of the refrigerator manufacturer, it should be noted that the set value of the cooling water supply temperature may be different depending on the type and the manufacturer of the refrigerator.

2 is a block diagram illustrating a structure of a cooling water supply temperature control device of a refrigerator in a building energy management system according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the cooling water supply temperature control apparatus 100 of the refrigerator includes an input unit 110, a monitoring unit 120, a control unit 130, an output unit 140, a communication unit 150, and a storage unit 160. It can be configured to include.

The input unit 110 receives a coolant supply temperature lower limit value of the refrigerator 11 through a screen displayed on the output unit 140 from the operator according to the information transmitted from the administrator. The input coolant supply temperature lower limit value is stored in the storage 160 to be used for later cooling water supply temperature control. In addition, the input unit 110 generates a user input signal corresponding to a user's request or information according to a user's operation, and may be implemented by various input means that are currently commercialized or that can be commercialized in the future. For example, a keyboard In addition to general input devices such as a mouse, a joystick, a touch screen, a touch pad, and the like, gesture input means for detecting a user's motion and generating a specific input signal can be included.

The monitoring unit 120 may monitor real-time energy monitoring and period-by-period energy monitoring of the refrigerator system 10, facility / control, indoor environment, or alarm. In particular, the monitoring unit 120 monitors the main items set in advance in the refrigerator system 10 in real time through various sensors and measuring instruments installed in the refrigerator system 10, and transmits the monitored result information to the controller 130. According to the present invention, the result information obtained by real-time monitoring of the refrigerator system 10 in which the cooling water supply temperature is controlled is transmitted to the controller 130. The main items monitored in real time may include cold water supply and return temperature, cooling water supply and return temperature, cold water flow rate, cooling water flow rate, refrigerator power consumption (energy consumption), cooling water pump power consumption, and cooling tower power consumption. In addition, the refrigerator system 10 may further include other items necessary for controlling the cooling water supply temperature of the refrigerator 11. The monitoring information obtained through the monitoring may be stored in the storage unit 160 and managed as statistical data.

In these main items, the cold water supply temperature and the cold water return temperature are items for checking the range of the cold water supply temperature and the cold water return temperature, and confirming whether a temperature difference value ΔT between the cold water supply temperature and the cold water return temperature is obtained. Cold water flow rate is an item that determines whether cold water maintains a constant flow rate. Refrigerator power consumption is an item to check the energy consumption before and after the cooling water supply temperature control compared to the power consumption of the refrigerator, cooling tower, cooling water pump and cold water pump. Cooling water supply temperature is an item for confirming the cooling water supply temperature lower limit. Cooling water return temperature is an item to check whether the cooling water supply temperature and the temperature difference value is secured. The cooling water flow rate is an item for confirming the change in power consumption of the cooling water pump and for checking the cooling load.

The controller 130 controls the overall operation of the cooling water supply temperature control device 100. In particular, according to an embodiment of the present invention, the control unit 130 analyzes the trend of the statistical data of the refrigerator system 10 previously stored in the storage unit 160, and inputs the lower limit of the coolant supply temperature of the refrigerator 11, and the monitoring Control the cooling water supply temperature change of the refrigerator (11) using the main items.

Specifically, the controller 130 analyzes the trend of statistical data for each day / month / day / quarter / half year / season of the refrigerator system 10 to check the cooling degree day (CDD) and the power consumption of the refrigerator in the middle of the previous year. To determine the application period for cooling water supply temperature control. Here, the power consumption of the refrigerator is dependent on the variable of the external temperature, and the cold-prevented water is a value obtained by subtracting a preset temperature (18 degrees) from the daily average temperature, and counting the day when the daily average temperature is 18 degrees or less. The daily average temperature can be calculated by dividing the maximum temperature and the minimum temperature by two (maximum temperature + minimum temperature) / 2). In addition, the controller 130 analyzes the trend of daily / monthly / quarterly statistical data of the refrigerator system 10 to check whether there is an abnormality of the refrigerator system 10. The trend comparison analysis items for confirming the abnormality of the refrigerator system 10 are as shown in Table 1 below.

No. Process
Value Alarm Type X-axis Y-axis Y'-axis Remarks Name Unit Name Unit Name Unit One CCD vs Refrigerator Power Consumption vs Cooling Tower Power Consumption vs Coolant Pump Power Consumption vs Cold Water Pump Power Consumption - time month Freezer energy consumption kWh Outside temperature
(CCD) - - 2 Cold water supply temperature vs cold water return temperature vs coolant supply temperature vs coolant return temperature January Cold water return temperature ℃ Cold water supply temperature ℃ - - -

The controller 130 analyzes the real-time monitored result information transmitted from the monitoring unit 120 to check the cooling water supply temperature measurement value, check the refrigerator power consumption and the cooling tower power consumption, and measure the coolant supply temperature lower limit value and the cooling water supply temperature. Compare the values to determine whether the cooling water supply temperature changes, and check whether the difference between the cold water supply / return temperature and the cooling water supply / return temperature is secured.

The controller 130 compares the coolant supply temperature measurement value with the input coolant supply temperature lower limit value and performs control to change the coolant supply temperature when the coolant supply temperature measurement value is larger than the coolant supply temperature lower limit value.

In order to control the cooling water supply temperature change, specifically, the controller 130 applies preset basic data of the refrigerator system to the simulation, and includes environmental variables (eg, outside air temperature, room temperature, occupancy rate, CO). 2 concentration, etc.) to derive the first control value for the first optimal cooling water supply temperature control. Next, the controller 130 sets the second control value by correcting the first control value by using the accumulated statistical data in order to derive a predicted value for controlling the second optimal cooling water supply temperature. Finally, the controller 130 changes the cooling water supply temperature of the refrigerator to the set second control value, corrects the second control value by using the monitoring information obtained by monitoring the refrigerator system in real time, and adjusts the final control value. Set it.

Accordingly, the controller 130 controls to change the cooling water supply temperature of the refrigerator system 10 to a final control value.

On the other hand, even if the control unit 130 directly or does not control the refrigeration system 10, the control unit 130 requests a manager for the cooling water supply temperature control to control the cooling water supply temperature of the refrigeration system (10). To this end, the controller 130 prepares a work instruction and delivers the work instruction to the manager to adjust the cooling water supply temperature according to the work instruction created in the refrigerator system 10. Accordingly, the manager operates the refrigerator system 10 by changing the cooling water supply temperature of the refrigerator according to the change value of the cooling water supply temperature included in the work order, and indicates that the cooling water supply temperature of the refrigerator is changed. Informed by.

The controller 130 analyzes the result of monitoring the refrigerator system 10 operated according to the changed cooling water supply temperature, checks whether an alarm occurs through an alarm management item, and when an alarm occurs in the refrigerator system 10, After performing the cooling water supply temperature control again, the operation request is made to the manager again with the optimum control value. Here, the occurrence of the alarm is a certain number of times in which the measured value in the refrigerator system 10 is above or below the error range in comparison with the judgment standard. In the embodiment of the present invention, for example, when the monitored cold water supply temperature does not satisfy the coolant supply temperature lower limit (a set value, for example, +1 degrees or less), an alarm is generated. Register an alarm to trigger As such, when the cooling water supply temperature lower limit is not satisfied, the total power consumption of the refrigerator system may increase, and thus the cooling water supply temperature must be increased.

The controller 130 analyzes the effects through the monitoring information, checks the energy savings result, and prepares and manages the energy savings report according to the energy savings results and effects by day / month / day / quarter / half year / season. do. In addition, the controller 130 may reapply the cooling water supply temperature control after examining whether the change to a value higher than the applied cooling water supply temperature change value is possible. The controller 130 delivers the energy saving report thus prepared to the manager. Accordingly, when the manager reviews the energy saving report or delivers additional work items, the controller 130 registers information on the review results or additional work items as examples of energy saving items.

The output unit 140 is a means for providing the user to recognize the operation result or state of the coolant supply temperature control apparatus 100. For example, a display unit that visually outputs through a screen or a speaker that outputs an audible sound. And the like. In particular, in the present invention, the output unit 140 configures and displays a screen so that the administrator can input the indoor environment management data, the result information monitored by the monitoring unit 120 and the work instruction sheet created by the control unit 130. And a changed work order and the like can be displayed on the screen.

The communication unit 150 transmits and receives data by connecting to a computer device of an administrator to be connected, and may transmit and receive data with other terminal devices through various communication methods as well as wired and wireless methods. In addition, data may be transmitted and received using one or more communication methods, and for this purpose, the communication unit 150 may include a plurality of communication modules that transmit and receive data according to different communication methods. In particular, in the present invention, the communication unit 150 performs communication for controlling the coolant supply temperature with the manager, and transmits the work order and the changed work order created by the control unit 130 to the computer device of the manager, the refrigerator system 10 ) Can be controlled remotely to automatically control the refrigeration system (10).

In addition, the communication unit 150 receives a notification message for the cooling water supply temperature of the refrigerator, and receives information related to the refrigerator system of the manager, and transmits the received information to the controller 130 to register the received information as an example of an energy saving item. .

 Meanwhile, in the exemplary embodiment of the present invention, the cooling water supply temperature control device 100 includes the communication unit 150, but it is described as transmitting and receiving data with the communication unit 150 through the administrator's computer device, but not through the communication unit 150. The administrator may directly input information on the screen of the output unit 140.

The storage unit 160 stores programs and data necessary for the operation of the coolant supply temperature control device 100, and basically stores an operation program of the coolant supply temperature control device 100, and also the refrigeration system 10. Stores basic set values, statistical data, input coolant supply temperature lower limit, real-time monitoring information, information necessary for control of coolant supply temperature, and information needed to prepare work instructions. The storage unit 160 may include an optical media such as a magnetic media such as a hard disk, a floppy disk, and a magnetic tape, a compact disk read only memory (CD-ROM), and a digital video disk (DVD). Magnetic-optical media such as floppy disks, and ROM, random access memory (RAM), and flash memory.

Next, a method for controlling the cooling water supply temperature of the refrigerator in the cooling water supply temperature control apparatus of the building energy management system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The cooling water supply temperature control device 100 monitors the refrigerator system 10, that is, main monitoring items, in real time through various sensors and measuring devices installed in the room or the refrigerator system 10 and statistics the monitoring information collected through the monitoring. Manage with data

3 is a flowchart illustrating a method for controlling a cooling water supply temperature of a refrigerator in a building energy management system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, in step 1101, the coolant supply temperature control apparatus 100 checks a coolant supply temperature lower limit value of the refrigerator 11 currently managed by a building.

In step 1102, the coolant supply temperature control device 100 analyzes the trend of statistical data of the pre-stored refrigeration system 10 to check the cooling degree day (CDD: Cooling Degree Day) and the power consumption of the freezer during the previous year. Identify the duration of the control. At this time, the cooling water supply temperature control device 100 analyzes the monitoring information to check the cooling water supply temperature range, that is, the measured value currently measured based on the confirmed cooling water supply temperature lower limit value, and check the refrigerator power consumption and cooling tower power consumption. Check whether the temperature difference between the cold water supply and return temperature and the cooling water supply and return temperature is secured.

Accordingly, the cooling water supply temperature control device 100 compares the cooling water supply temperature lower limit value with the cooling water supply temperature measurement value and determines whether the cooling water supply temperature is changed.

In detail, in operation 1103, the coolant supply temperature control apparatus 100 compares the input coolant supply temperature lower limit value with the coolant supply temperature measurement value.

As a result of the comparison, when the measured value of the coolant supply temperature is larger than the lower limit of the coolant supply temperature, in step 1104, the coolant supply temperature control device 100 changes the coolant supply temperature of the refrigerator 11 to an optimal control value within the lower limit of the coolant supply temperature. To perform the control.

Specifically, the cooling water supply temperature control device 100 applies the preset basic data of the refrigerator system to the simulation, and simulates according to environmental variables (for example, ambient temperature, room temperature, occupancy rate, CO 2 concentration, etc.). Through this, a first control value for controlling the first optimum cooling water supply temperature is derived. Next, the coolant supply temperature control apparatus 100 uses similar accumulated environmental data (for example, outside air temperature and room temperature) to derive a predicted value for controlling the second optimal cooling water supply temperature. , Freezing rate, day of week, CO 2 concentration, indoor cooling load, etc. Set the value. Finally, the cooling water supply temperature control device 100 changes the cooling water supply temperature of the refrigerator 11 to the second control value, and then optimally optimizes the cooling water in a third manner according to the monitoring information obtained by real-time monitoring of the refrigerator system 10. For supply temperature control, the second control value is corrected to set the final control value. In order to prevent the efficiency of the cooling tower 12 from increasing in power, the optimum control value may be set above the cooling water supply temperature lower limit in consideration of the balance of the refrigerator 11 and the cooling tower 12.

Accordingly, the cooling water supply temperature control device 100 controls to change the cooling water supply temperature of the refrigerator system 10 to a final control value.

Thereafter, if necessary in step 1105, the manager requests a work on changing the cooling water supply temperature. To this end, the cooling water supply temperature control device 100 prepares a work instruction and delivers the work instruction to the manager. Accordingly, the manager changes the cooling water supply temperature of the refrigerator 11 according to the instructions.

After changing the coolant supply temperature of the freezer, in step 1106, the coolant supply temperature control device 100 checks whether an alarm for abnormal operation of the freezer occurs in the freezer system 10 through real-time monitoring information.

As a result of the check, if an alarm occurs, the process proceeds to step 1104 and the cooling water supply temperature control apparatus 100 performs control for changing the cooling water supply temperature of the refrigerator again.

On the other hand, if the alarm does not occur during the set period, the cooling water supply temperature control device 100 in step 1107 through the monitoring information collected by monitoring the refrigeration system 10 through the energy saving results and effects of the change in the cooling water supply temperature Check it. At this time, the cooling water supply temperature control device 100 may create and manage an energy saving report for each day / month / quarter by using analysis result information on energy saving results and effects. The cooling water supply temperature control device 100 transmits the energy saving report thus prepared to the manager. This allows the manager to review the energy savings report or direct further work.

On the other hand, the cooling water supply temperature control device 100 can determine the energy savings by analyzing the effect through the real-time monitoring result information of the refrigerator 11, the power consumption before the cooling water supply temperature control and the expected power consumption after the cooling water supply temperature control The estimated savings and savings can be calculated by comparing the results, and the expected savings can be calculated by applying the power cost and annual uptime to the expected savings. Accordingly, when preparing the energy saving report, the cooling water supply temperature control device 100 may prepare an energy saving report by applying the analysis result by comparing and analyzing the energy saving check item using historical data.

Specifically, the cooling water supply temperature control device 100 compares the power consumption of the refrigerator and the cooling tower, and compares the solution with the solution that does not control the cooling water supply temperature and confirms the energy saving effect. This comparison can be done on a monthly / yearly basis.

In addition, the cooling water supply temperature control apparatus 100 may analyze the daily use amount of the refrigerator and cooling tower power before and after the cooling water supply temperature control and confirm the saving effect by the hourly energy consumption graph before and after the cooling water supply temperature control. This comparison can be done on a daily basis.

Finally, the cooling water supply temperature control device 100 analyzes the freezer period COP and compares the same year last year and the COP before and after the implementation in the same period. In this case, when comparing with the system COP, the power consumption of the refrigerator and the cooling tower is evaluated including the power of the cold water pump or the cooling water pump (chiller + cooling tower + pump). This comparison can be done on a day / month / year basis. Here, COP is a freezing effect obtained by freezing with respect to work (W) supplied under a certain condition, and inputs cooling capacity or calorific value (Q e ) as a ratio of the freezing capacity to the heating amount input to the regenerator. It can be calculated as the value divided by calorie value (A W ). Here, the cooling capacity or the heat quantity Q e is -860 at the power consumption of the refrigerator from the first value minus the cooling water supply temperature from the cooling water flow rate, specific heat of water (1.0 at room temperature), specific weight of water (1,000 at room temperature) and cooling water return temperature. It is multiplied by the value obtained by subtracting the second value minus [kcal / kWh]. The input calories are multiplied by the refrigerator's power consumption and 860 [kcal / kWh].

Such energy savings confirmation can also be confirmed by the manager through an energy saving report.

In order to accurately compare energy savings, it may be necessary to select a period of time similar to the ambient temperature / humidity and air conditioning load, cooling water supply / return temperature, other than the cooling water supply temperature setpoint.

By analyzing the energy saving effect through the monitoring result information as described above, it is possible to know the change in the power consumption of the refrigerator according to the change in the coolant inlet temperature of the freezer.

By changing the cooling water supply temperature according to an embodiment of the present invention, the load of the refrigerator can be reduced to reduce the power consumption of the refrigerator.

The method for controlling the cooling water supply temperature of the refrigerator according to the present invention may be implemented in software form readable by various computer means and recorded on a computer readable recording medium. Here, the recording medium may include program commands, data files, data structures, and the like, alone or in combination. Program instructions recorded on the recording medium may be those specially designed and constructed for the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. For example, the recording medium may be an optical recording medium such as a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, a compact disk read only memory (CD-ROM), a digital video disk (DVD) Includes a hardware device that is specially configured to store and execute program instructions such as a magneto-optical medium such as a floppy disk and a ROM, a random access memory (RAM), a flash memory, do. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art. In addition, although specific terms are used in the specification and the drawings, they are only used in a general sense to easily explain the technical contents of the present invention and to help the understanding of the present invention, and are not intended to limit the scope of the present invention.

The present invention relates to an apparatus and a method for controlling a cooling water supply temperature in a building energy management system, and by reducing the setting of the cooling water supply temperature, it is possible to reduce the load of the refrigerator to reduce the consumption of the refrigerator and to operate the refrigerator system efficiently. This has the effect of reducing the energy consumption, so there is industrial applicability.

In addition, the present invention can improve the efficiency of the freezer by lowering the cooling water supply temperature when the cooling load is light load or when cooling is required even in the winter or mid-term, and thus there is an energy saving effect, so there is industrial applicability.

10: freezer system 11: freezer
100: cooling water supply temperature control device
110: input unit 120: monitoring unit
130: control unit 140: output unit
150: communication unit 160: storage unit

Claims (13)

A monitoring unit for monitoring the refrigerator system in real time; And
Analyze the trend of statistical data of the refrigerator system, determine whether to change the cooling water supply temperature of the refrigerator by using a predetermined cooling water supply temperature lower limit value and the cooling water supply temperature measurement value of the refrigerator, and when the cooling water supply temperature of the refrigerator is required to be changed. And a controller configured to change the cooling water supply temperature of the refrigerator by using the real-time monitoring information obtained through monitoring by the monitoring unit and the analyzed statistical data;
Cooling water supply temperature control device in a building energy management system comprising a. The method of claim 1,
And a storage unit storing one or more of the coolant supply temperature lower limit value, the coolant supply temperature measurement value, the statistical data, the main monitoring items, the monitoring information, and the information for controlling the coolant supply temperature. Cooling water supply temperature control device in energy management system. The apparatus of claim 1,
Cooling water supply temperature control device in the building energy management system, characterized in that if the alarm occurs according to the abnormal operation of the refrigerator system, the control for changing the cooling water supply temperature of the refrigerator again. The apparatus of claim 1,
Cooling water supply temperature control device in the building energy management system, characterized in that after the cooling water supply temperature of the refrigerator is changed, the energy saving result is confirmed according to the analysis result by analyzing the monitoring information obtained by monitoring the refrigerator system. The apparatus of claim 1,
Analyze the trend of the statistical data to determine the application period by identifying the cold water and the power consumption of the refrigerator in the past, by analyzing the trend of the statistical data for each period to check whether there is an abnormality of the refrigerator system Cooling water supply temperature control device in the management system.
The method of claim 5,
The cold protection water is a value obtained by subtracting a preset temperature from a daily average temperature value obtained by dividing a maximum temperature and a minimum temperature by 2, and building energy management, wherein the day average temperature is less than a preset temperature. Cooling water supply temperature control system in the system. The apparatus of claim 1,
Apply preset basic data of the refrigerator system to a simulation, derive a first control value through simulation according to an environmental variable, correct the first control value using the statistical data, and set a second control value; After changing the coolant supply temperature of the refrigerator to the set second control value, the final control value is set by correcting the second control value according to the monitoring information obtained through real-time monitoring of the refrigerator system, and setting the final control value to the set final control value. Cooling water supply temperature control device in a building energy management system, characterized in that for performing control for changing the cooling water supply temperature of the refrigerator. 8. The apparatus of claim 7,
In the building energy management system, the cooling water supply temperature is changed when the cooling water supply temperature measurement value is greater than the cooling water supply temperature lower limit value by comparing the cooling water supply temperature measurement value with the cooling water supply temperature lower limit value of the refrigerator. Cooling water supply temperature control device. Checking a coolant supply temperature lower limit of a preset refrigerator;
Monitoring the freezer system in real time;
Analyzing a trend of statistical data of the freezer system;
Comparing the coolant supply temperature lower limit value and the coolant supply temperature measurement value to determine whether the coolant supply temperature of the refrigerator is changed; And
If it is necessary to change the cooling water supply temperature of the refrigerator, performing control for changing the cooling water supply temperature of the refrigerator using monitoring information and the analyzed statistical data; Cooling water supply temperature control method in a building energy management system comprising a. 10. The method of claim 9,
Checking whether an alarm occurs according to an abnormal operation of the refrigerator system; And
If an alarm occurs, performing control for changing the coolant supply temperature of the refrigerator again;
Cooling water supply temperature control method in a building energy management system characterized in that it further comprises. 10. The method of claim 9,
Confirming an energy saving result by analyzing monitoring information obtained by monitoring the refrigerator system after the cooling water supply temperature of the refrigerator is changed;
Cooling water supply temperature control method in a building energy management system characterized in that it further comprises. The method of claim 9, wherein analyzing the trend of the statistical data of the refrigerator,
Identifying past cold water;
Identifying a freezer power consumption; And
Determining the application period of the control for changing the cooling water supply temperature by applying the identified cold prevention water and the refrigerator power consumption;
Cooling water supply temperature control method in a building energy management system comprising a. The method of claim 9, wherein the performing of the control for changing the cooling water supply temperature of the refrigerator comprises:
Applying preset basic data of the refrigerator system to a simulation and deriving a first control value through simulation according to an environmental variable;
Correcting a first control value using the statistical data to set a second control value;
Changing a cold water supply temperature of the refrigerator to a set second control value;
Setting a final control value by correcting the second control value according to monitoring information obtained through real-time monitoring of the refrigerator system; And
Performing control for changing the coolant supply temperature of the refrigerator to the final control value;
Cooling water supply temperature control method in a building energy management system comprising a.
KR1020120039875A 2012-04-17 2012-04-17 Device and method for controlling inlet temperature of cooling water in network operating center building energy management system KR20130117117A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112082292A (en) * 2020-08-28 2020-12-15 北京京仪自动化装备技术有限公司 Refrigeration system
CN112567187A (en) * 2018-09-13 2021-03-26 三菱重工制冷空调***株式会社 Control device, heat source system, method for calculating lower limit value of cooling water inlet temperature, control method, and program
KR102325379B1 (en) 2021-04-14 2021-11-10 경상국립대학교산학협력단 Operation Control Method for High Temperature Difference and Low Condenser Water Temperature on Cooling Towers

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112567187A (en) * 2018-09-13 2021-03-26 三菱重工制冷空调***株式会社 Control device, heat source system, method for calculating lower limit value of cooling water inlet temperature, control method, and program
CN112567187B (en) * 2018-09-13 2022-06-03 三菱重工制冷空调***株式会社 Control device, heat source system, method for calculating lower limit value of cooling water inlet temperature, control method, and recording medium
US11713900B2 (en) 2018-09-13 2023-08-01 Mitsubishi Heavy Industries Thermal Systems, Ltd. Control device, heat source system, method for calculating lower limit of cooling water inlet temperature, control method, and program
CN112082292A (en) * 2020-08-28 2020-12-15 北京京仪自动化装备技术有限公司 Refrigeration system
CN112082292B (en) * 2020-08-28 2022-03-22 北京京仪自动化装备技术有限公司 Refrigeration system
KR102325379B1 (en) 2021-04-14 2021-11-10 경상국립대학교산학협력단 Operation Control Method for High Temperature Difference and Low Condenser Water Temperature on Cooling Towers

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