KR101384217B1 - System for operating complex refrigerator - Google Patents

Abstract

The present invention relates to an operating system of a combined refrigerator including a centrifugal refrigerator, an absorption refrigerator, and an ice storage freezer, comprising: a data input unit configured to receive data provided from an external source and store the received information by type of input information; A unit price calculator configured to calculate the cost consumed by each refrigerator by a set amount of heat by applying unit price information of each heat source for each time slot to the specifications of the refrigerator when the unit price information for each heat source for each time slot is input through the data input unit; A load ratio calculator configured to calculate a load ratio for each time zone according to the input external temperature information when external temperature information is input through the data input unit; A cooling load calculation unit configured to calculate a cooling load to be consumed in a corresponding time period by using the load ratio calculated by the load rate calculation unit; Selecting the operation refrigerator to determine the minimum number of operation refrigerators that can generate the cooling load more than the lowest in consideration of the cooling load calculated by the cooling load calculation unit, the consumption cost for each refrigerator calculated by the unit price calculation unit part; And a freezer moving unit configured to operate a freezer selected by time slots by the movable freezer selecting unit at a corresponding time period, wherein the movable freezer selecting unit determines an ice storage heat operation time through an inverse estimation algorithm of ice storage heat.

Description

Compound freezer operating system {SYSTEM FOR OPERATING COMPLEX REFRIGERATOR}

The present invention relates to an operating system of a combined freezer, and more particularly, a freezer installed in a building selects a freezer that satisfies a sufficient freezing effect at the lowest price for each time period in consideration of the external temperature, the heat source unit price, and the specifications of the freezer. The present invention relates to a complex refrigeration operating system based on a heat source unit cost which can be efficiently operated.

As the industry develops, the number of buildings is increasing, and each building uses a lot of energy for heating and cooling and operating the facilities. Energy consumption in buildings accounts for about 22.3% of the country's total energy consumption, according to data released in 2000, and it is increasing every year. In addition, since the energy consumption of the building is directly related to the financial expenditure from the perspective of the building owner, the inefficient energy consumption of the building has a significant financial burden on the building owner.

To solve these problems, it is necessary to efficiently and systematically manage the use of energy consumed in buildings. However, the operation of each building, especially the operation of the freezer, is operating by cooling all of the freezers installed in the building when the conditions that require refrigeration, and when the driver feels that the internal temperature is too high or too low, then the output of the freezer is adjusted. Invar, a more systematic operation system of the refrigerator is required.

In response to such a request, a data input unit for receiving data provided from an external device from Patent No. 561926, "Refrigerator operating system and method based on heat source cost," registered by the applicant and storing the data for each type of input information, and the data When the unit price information of each heat source for each time zone is input through an input unit, a unit price calculator for calculating the cost consumed by each refrigerator per set calories by applying the unit price information of each heat source for each time slot to the specifications of the refrigerator, and the data input unit. When the external temperature information is input through the load rate calculation unit for calculating the load rate for each time zone according to the input external temperature information, and the load amount for calculating the cooling load to be consumed in the corresponding time period using the load rate calculated by the load rate calculation unit And the cooling load calculated by the cooling load calculating unit and the unit price calculating unit. The driver selects the minimum number of refrigerators that can generate the cooling load or more at least in consideration of the calculated consumption cost of each refrigerator, and the result calculated or determined by the calculation unit and the selection unit. It has been proposed a system including a display unit for displaying the display.

The above-mentioned system aims to reduce energy consumption by efficiently operating a refrigerator in a building and to reduce the cost of cooling in consideration of the heat source cost and the energy efficiency of the refrigerator. The cooling load is calculated and the cooling energy is managed by selecting and operating the number and operation of the refrigerator in response to the cooling load. However, since the specific operation method of the refrigerator is not mentioned, there is a problem in that the efficiency of the refrigerator is inferior.

The present invention is to solve the above-mentioned conventional problems, an object of the present invention, a refrigerator that satisfies the sufficient freezing effect at the most affordable price for each time zone in consideration of the specifications of the external temperature, heat source unit price and the freezer installed in the building To provide a combined refrigeration operation system based on the heat source unit cost that can be selected and run efficiently.

In order to achieve the above object, the present invention provides a centrifugal chiller, an absorption chiller, and an operating system of a combined chiller including an ice storage freezer according to the first aspect of the present invention.

A data input unit configured to receive data provided from the outside and store the received information for each type of input information; A unit price calculator configured to calculate the cost consumed by each refrigerator by a set amount of heat by applying unit price information of each heat source for each time slot through the data input unit, by applying unit price information of each heat source for each time slot to a specification of a refrigerator; A load ratio calculator configured to calculate a load ratio for each time zone according to the input external temperature information when external temperature information is input through the data input unit; A cooling load calculation unit configured to calculate a cooling load to be consumed in a corresponding time period by using the load ratio calculated by the load rate calculation unit; Selecting the operation refrigerator to determine the minimum number of operation refrigerators that can generate the cooling load more than the lowest in consideration of the cooling load calculated by the cooling load calculation unit, the consumption cost for each refrigerator calculated by the unit price calculation unit part; And a freezer moving unit configured to operate the freezer selected by the operating time zone by the movable freezer selecting unit at a corresponding time zone, wherein the movable freezer selecting unit includes determining the operation time of ice storage heat through an inverse estimation algorithm of ice storage heat. .

Here, the ice heat storage back estimation algorithm is

Q (t) refers to the amount of heat calculated by integrating the required cumulative energy per hour after assuming a linear change in energy value for each time zone.

Also in this aspect, the centrifugal freezer is operated at the moment when the accumulated amount of ice storage system is equal to or greater than the capacity of the ice storage system, and the centrifugal freezer is centrifuged until the total energy amount of the centrifugal freezer is greater than the centrifugal freezer production (1300 RT * Rm). The refrigerators are increased by one up to the maximum number of simultaneous operating machines, where Rm represents the number of centrifugal refrigerators.

In the above embodiment, the centrifugal freezer in the ice storage freezer is operated when the total amount of energy of the centrifugal freezer is greater than the production of the centrifugal freezer, and the remaining cooling energy except the amount of energy produced by the centrifugal freezer is centrifugal in the ice storage freezer. Increase the number of centrifugal chillers included in the ice storage refrigeration system by one up to the maximum number of simultaneous operations, where Rmi is the number of centrifugal freezers included in the ice storage refrigeration freezer until the output produced by the formula operation (1300RT * Rmi) is greater. Indicates.

Also, in the above aspect, the absorption chiller is operated when the cooling energy other than the energy produced by the centrifugal freezer is greater than the production amount (1300RT * Rmi) produced by the centrifugal operation of the ice storage freezer. Raise the absorption chiller by one up to the maximum number of simultaneous operation of the absorption chiller until the cooling energy other than the cooling energy of the centrifugal chiller of the ice storage system is greater than the output produced by the absorption operation (1300 RT * Ra), where Ra is the maximum Indicates the number.

Also, in the above aspect, when the remaining cooling energy other than the cooling energy of the centrifugal freezer of the centrifugal freezer and the ice storage freezer is greater than the amount produced by absorption operation (1300 RT * Ra), the centrifugal freezer of the ice storage freezer is deactivated. At the same time, the ice storage freezer is operated.

According to the present invention described above it is possible to operate the complex freezer more efficiently based on the amount of heat produced by each freezer of the complex freezer installed in the building.

1 is a view schematically showing the configuration of a combined refrigerator operation system according to the present invention.
2 is a view schematically showing a method of operating a combined refrigerator operation system according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, the refrigerator operation method based on the heat source cost of the present invention uses a heat source cost known in the country. In general, the cost of electricity among heat sources varies depending on the place of use, the standard voltage, season, and time, and the price of electricity is known by KEPCO whenever there is a change in a previously known price.

The places of use are divided into residential, general, educational, industrial, agricultural, street light, and midnight power, and the standard voltage used is whether the standard voltage is 110V or more and 380V or less (low voltage power) or 3,300V or more and 66,000V or less (high voltage A). It is divided into 157,000V (high voltage B) or standard voltage 345,000V or higher (high voltage C) .The season is divided into summer, spring, autumn and winter. Load), power in the normal time range (medium load), and low power consumption in time (light load).

Here, the place of use and the standard voltage to be used are not arbitrarily selectable, and thus are excluded from consideration of unit cost. Seasonal and time-phase electric unit prices and time zone information considered by the present invention are shown in [Table 1] and [Table 2].

In case of general power, high voltage B, contract power 3000kw or more division Electricity bill
(Won / ㎾) Electricity Charge (Won / ㎾h) slot Summer season spring fall Winter Choice (2)
High pressure B
6,780 Light load 39.90 39.90 39.90 Medium load 87.70 64.30 73.80 Load 153.70 87.70 103.80

Divide general-purpose power by season and time zone Seasonal Summer season spring fall Winter By time July to August April to June, September October to March Light load 22:00-08:00 22:00-08:00
Intermediate load 08:00-10:00
12:00-14:00
17: 00-22: 00 08: 00-16: 00
20:00 to 22:00 Load 10:00-12:00
14:00 to 17:00 16:00-20:00

The gas price varies depending on whether it is from May to September (for cooling) or October to April (for heating).

Considering the heat source cost as described above is because the heat source used for each type of the refrigerator is different, the amount of heat source per unit calories is different for each type of the refrigerator. As an example, a cooling device installed in each building for cooling is classified into an absorption refrigerator, an electric (or centrifugal) refrigerator, and an ice storage freezer.

Absorption-type refrigerators use gas as a heat source, and centrifugal-type refrigerators use electricity as a heat source. In addition, the ice storage freezer serves as a centrifugal freezer to ice the energy in the late-night power. Hereinafter, the ice storage freezer will be designated as an ice storage freezer only when it is to be distinguished from a centrifugal freezer which does not produce the ice storage heat. Furthermore, in the case of absorption refrigerators, the heat source capacity per unit calories (1000 kcal) is 13.75% for gas, and in the case of centrifugal refrigerators, the heat source capacity (1000 kcal) is 35.01% for electricity.

As described above, the main heat source is different according to the refrigerating machine type, the unit cost is different for each heat source, and the efficiency of using the heat source is different, so that the operation of the refrigerator in consideration of the unit cost of each heat source for each time zone can have a cost saving effect.

Therefore, the present invention is not simply to use the cheapest heat source at the time of use, it is characterized in that the use of a freezer, which has a large amount of heat output even if the price of the heat source to be used is a little more expensive.

In addition, the present invention is characterized in that the operation of the refrigerator according to the operation method of the refrigerator to reduce the waste of unnecessary energy while satisfying a comfortable indoor environment according to the scientifically organized data, not the data obtained from myriad experiences.

1 is a block diagram of a refrigerator operation system based on a heat source cost according to an embodiment of the present invention. As shown in FIG. 1, the refrigerator operating system based on the heat source cost according to the embodiment of the present invention includes a data input unit 10, a unit price calculator 20, a load factor calculator 30, and a cooling load calculator. 40), a plurality of absorption chillers (A), a plurality of centrifugal chillers (B), and a plurality of ice heat storage freezers, including a movable refrigerator selector (50), a refrigerator movable unit (60), and a database (70). Selectively start C).

The data input unit 10 is for receiving data provided from the outside, and the input data includes time zone temperature information (hereinafter referred to as 'external temperature') information and unit price information for each heat source type. The data input unit 10 may include an input terminal to receive data input by a person, or may be connected to an external system to receive data provided by the external system. If the external temperature provided by the data input unit 10 is not classified for each time zone, the data input unit 10 may be configured to make the external temperature for each time zone in consideration of time deviation.

The external system is a system of an institution or a group or a company that can provide accurate external temperature information, such as the Korea Meteorological Administration, and / or a system of an organization, a company or a company that notifies unit price information for each heat source, such as KEPCO.

The data input unit 10 stores the input external temperature information in the external temperature DB 73 of the database 70 and stores the heat source cost information in the heat source cost DB 72.

When the unit price calculation unit 20 receives heat source unit price information from the data input unit 10, the unit unit unit A, B, and C will consume unit price for each time period using the input unit of the unit price and the specification of each unit installed in the building. Calculate The unit price is calculated for each time zone because the unit price of the heat source changes for each time zone. The unit price for each freezer calculated by the unit price calculation unit 20 is a unit price required per 1000 kcal.

When the external temperature information is input, the load factor calculator 30 calculates a load factor for adjusting the output of all the air conditioners A to C installed in the building according to the input external temperature information. When the load ratio is 100%, it means to operate all the cooling devices to the maximum output, and when the load ratio is 60%, it means to output only 60% of the maximum output that all the cooling devices can output. The load rate calculated by the load rate calculation unit 30 is determined according to the temperature information. If the temperature information is a day value, the load rate is calculated for each time zone based on the day, and when the temperature information is one day or more, The load rate for each time slot is calculated.

The load factor calculator 30 uses the following equation (1) set to calculate the load factor according to the external temperature.

(수학식 1)

(1)

In the above description, the external temperature is an outdoor temperature in units of one hour, and the compensation value is a value for setting a target temperature, and the correction coefficient is an indoor temperature targeted by an experience value (experimental value) obtained by operating the refrigerator several times. This is a value that compensates for the chiller's output for a fixed set of 3/4. The correction coefficient may vary depending on the specifications and performance of the refrigerator installed in the building.

31.1 is called a design outside temperature in a known word, and is an outside temperature that is a reference for design. The design outside air temperature 31.1 is a value commonly applied to cooling equipment.

Referring to the load rate calculation operation of the load rate calculation unit 30 using Equation 1 as an example in Korea, the summer cooling temperature recommended by the government is 26 degrees-28 degrees. Therefore, the compensation value is set to 3.1, which is 31.1-28, and the load factor is 85% when the external temperature is 27 degrees.

The cooling load amount calculation unit 40 calculates the cooling amount required by the building, that is, the cooling load amount by using the cooling load rate for each time period calculated by the load rate calculation unit 30.

The movable refrigerator selecting unit 50 selects the refrigerator to be operated based on the cooling load calculated by the cooling load calculation unit 40 and the unit cost for each refrigerator calculated by the unit price calculating unit 20.

In more detail, the movable refrigerator selecting unit 50 determines the number of air conditioners to be operated according to the cooling load calculated by the cooling load calculating unit 40, and according to the unit price for each refrigerator calculated by the unit cost calculating unit 20. Select the freezer to run.

At this time, the selection of the refrigerator to be operated is selected according to the operation algorithm of the combined refrigerator according to the present invention with reference to Figure 2 to be described later.

Here, there are matters to consider when selecting the refrigerator in which the movable refrigerator selecting unit 50 is operated. That's because the cheaper price won't be able to run the same kind of freezer. This is because, if several days of continuous operation, the chiller will be crowded and the life of the freezer will be shortened. If a refrigerator is developed that does not work even with continuous operation, the operation freezer selection unit 50 will simply select the priority of the unit cost.

However, since a freezer that does not go unreasonable even after a long time operation has not been developed, the freezer selection unit 50 does not select one or more of the same type of freezers so that it can be used alternately for several days without difficulty. Is good.

The database 70 stores and processes various types of data for operating the refrigerator. That is, the database 70, the information on the load rate calculated by the load rate calculation unit 30 is the load rate DB 71, the unit price information for each freezer calculated by the unit price calculation unit 20 is the heat source unit price DB 72, External temperature DB 73 for storing external temperature information for each time zone inputted through the data input unit 10, a cooling load amount DB 74 for storing cooling load information calculated by the cooling load amount calculation unit 40, and each refrigerator Refrigerator specification DB 75, which stores their product specification information, and a refrigerator production calorie DB 50 in which data on daily production cost is stored together with the production calorie of the refrigerator.

The refrigerator moving unit 60 may operate the refrigerator in response to an algorithm selected from the movable refrigerator selecting unit 50.

Here, it is preferable that the present invention includes a display device (not shown) so that the driver can visually check the information stored in the database 70 and the driving operation state.

When the operation algorithm of the refrigerator according to the present invention is implemented, it is assumed that the operating conditions of the refrigerator are as follows.

end. Ice heat storage end time is fixed at 19:00 pm.

In the existing refrigerator operation, the ice storage heat is based on the end of operation until 19 o'clock, but the remaining heat source is moved to night, and the actual ice storage operation is used until 21 o'clock or 22 o'clock, the ice storage time. However, as described above, when more accurate prediction of the cooling load during the day becomes possible, the end time is based on 19 o'clock because the ice storage system can be fully utilized.

I. Ice heat storage uses a total of 65% of heat storage, and the maximum possible live capacity is 10,000,000 Kcal.

Currently, ice storage systems accumulate 60-70% of the total ice storage capacity and use them over 7-9 hours. Considering these operating conditions, the output per heat exchanger was determined to be about 1,000RT.

All. The freezer operation is based on the 15:00, the number of log increases in the previous hour and then decreases.

As shown in FIG. 2, since ice storage heat processes the protruding portion of the entire curve starting at 14-16 o'clock as the maximum cooling load time, the remaining portion is in a polygon close to the trapezoid of the lower portion, and the number of operating units of the freezer is increased. Since the latter part tends to decrease, the algorithm that increases the number of refrigerators before 13:00 and the number of refrigerators after 13:00 is considered.

3 is a flowchart illustrating an operation algorithm of a combined refrigerator for cost reduction according to the above-described conditional expressions and assumptions. Algorithm according to the present invention is composed of six modules each of variable input, ice heat storage thawing time determination, centrifugal operation determination, ice-axis centrifugal operation determination, absorption operation determination, thawing operation determination. And the distribution process of the refrigerator according to this algorithm is as follows.

First, in step S100, a graph is obtained by connecting load points for each time zone, the maximum point of the graph is obtained, and the cooling load prediction amount for each time zone is input.

Next, in step S110, the energy value for each time is assumed to be linear in the graph, and then the required cumulative energy per hour is calculated using the integral formula (Q (t)). Is called fixed cooling energy production.)

Next, as in step S120, the ice storage heat storage operation time is determined by using an ice storage heat recalculation algorithm. A time point corresponding to the total capacity of the ice storage heat is determined to determine the start time of ice storage heat storage. Equation (14) below relates to the total capacity of the ice storage system, and proceeds to the next step S130 at the moment when the accumulated amount of operation of the ice storage system is greater than or equal to the capacity of the ice storage system. Otherwise, the flow returns to step S120 under the condition t = t-0.5.

(식 14)

(Eq. 14)

In step S120, the instantaneous centrifugal operation is performed at a capacity equal to or greater than the accumulated capacity of the ice storage system, where Rm represents the number of centrifugal refrigerators. In this embodiment, the first priority in the fixed cooling energy production portion is a centrifugal freezer, and as shown in step S140, until the total energy amount of the centrifugal freezer is greater than this centrifugal freezer production amount (1300RT * Rm). The centrifugal freezer is increased by one up to the maximum number of simultaneous operation possible (in this embodiment, the maximum number of centrifugal freezers is 3).

As in step S140, when the total energy amount of the centrifugal freezer is greater than the centrifugal freezer production amount (1300RT * Rm), the centrifugal operation of the ice storage freezer is performed as in step S150. Similar to the centrifugal operation described above, the centrifugal operation of the ice storage freezer also produces the amount of cooling energy remaining by the centrifugal operation of the ice storage freezer except for the energy produced by the centrifugal freezer as shown in step S160. Increase the number of centrifugal freezers included in the ice storage refrigeration system by one up to the maximum number of simultaneous operation possible up to a point greater than (1300 RT * Rmi) (in this embodiment, the maximum number of centrifugal freezers of the ice storage refrigeration system is 3). ).

Next, when the total energy amount of the centrifugal freezer is greater than the energy production amount (1300RT * Rmi) produced in the ice storage freezer centrifugal operation, the step proceeds to S170 and absorption operation is performed, as shown in step S180, ice storage heat. Prior to the system start-up time, the absorption chillers are increased by one up to the maximum number of units that can be operated simultaneously except for the cooling energy of the centrifugal chillers and the centrifugal chillers of the ice storage system.

Next, at step S180, as shown in steps S190 and S200, when the remaining cooling energy is greater than the production amount (1300 RT * Ra) produced by the absorption operation except for the cooling energy of the centrifugal freezer and the centrifugal freezer of the ice heat storage freezer. In addition, the ice storage system is operated, the centrifugal freezer included in the ice storage system is stopped and the number Ri of the ice storage refrigerator is increased or decreased in accordance with the fixed cooling energy output, and then the process proceeds backward to step S130.

In another aspect, the present invention provides a method for obtaining the daily production calorie and daily calorie production cost of the composite refrigerator in order to efficiently manage the cooling energy efficiency in the building having a composite refrigerator consisting of a centrifugal freezer, endothermic freezer, ice heat storage freezer. .

Equation 1 below represents a conceptual expression of the heat source production amount for each freezer per hour, Equation 2 is represented by a generalized formula according to the parameters described in Table 3 below.

[Table 3] Efficiency Variables 1 of the Refrigeration System

(식 1)

(Equation 1)

(식 2)

(Equation 2)

Here, qt represents calories and c represents specific heat.

However, since the flow rate of each refrigerator in the BAS data is unknown, the thermal energy generated when the refrigerator is operated should be assumed to be the same. [Table 4] below shows the variables of the refrigerating device according to the capacity of the refrigerator, and the energy production per hour is expressed by Equation (3) below.

[Table 4] Efficiency parameters of refrigeration unit 2

(식 3)

(Equation 3)

In the above formula, p means the operation of the ice storage and the centrifugal freezer included in the ice storage heat, t is a variable for the time and represents each specific time within the 24 hour range.

Qa is the production calorie of the absorption chiller, Qm is the calorific value of the centrifugal chiller, and Qi is the calorific value of the ice heat storage system. The total calories produced in the entire refrigerator can be expressed by Equation (4), where the daily heat output of the centrifugal freezer is represented by Equation (5).

(식 4)

(Equation 4)

(식 5)

(Equation 5)

The daily heat source production amount of the centrifugal chiller is obtained by multiplying the total daily production calories by the production cost for each hour, which can be expressed by Equation (6), where Equation (7) represents the conditional expression for n _m .

(식 6)

(Equation 6)

(식 7)

(Equation 7)

The daily calorific value of the absorption chiller is similar to the method of calculating the daily calorific value of the centrifugal chiller, and Equation (8) is an expression representing the daily calorific value of the absorption chiller.

(식 8)

(Expression 8)

In addition, if the total daily calorific value of the absorption chiller is multiplied by the production cost for each hour, the daily heat source production amount of the absorption chiller is expressed by Equation (9), and the conditional equation is expressed as Equation (10).

(식 9)

(Equation 9)

(식 10)

(Equation 10)

The total daily calorific value of ice heat storage freezers is different from the centrifugal or absorption type. Ice storage heat is assumed to use the maximum amount during the day because ice storage heat is the lowest production cost during the day. In addition, since ice storage should take into account the cost of electricity input during its production, the daily production cost of ice storage should be expressed as shown in Eq. (11). Where Ts is the freezer uptime during night ice storage, and r _s is the amount per 1000Kcal produced by one freezer during ice storage. Equation (12) also corresponds to the heat exchanger logarithm control algorithm as the conditional expression for ni.

(식 11)

(Expression 11)

(식 12)

(Expression 12)

Therefore, the total production cost of the daily cooling energy of the combined refrigerator including the centrifugal, absorption and ice heat storage freezers is the sum of equations (6), (9) and (11). Can be expressed.

(식 13)

(Expression 13)

The daily calorific value of cooling energy and thus the daily calorific cost of cooling energy in the complex refrigerator as described above may be simultaneously performed by the unit price calculator 20 described above or may be made through a separate calculation means.

Therefore, by monitoring the daily production calories and the corresponding daily production calorie cost of the combined refrigerator can determine how much the actual cost of cooling the building due to the operation of the refrigerator.

The technical spirit of the present invention has been described above with reference to the accompanying drawings, but this is by way of example only and not intended to limit the present invention. In addition, anyone of ordinary skill in the art that various modifications can be made without departing from the scope of the technical spirit of the present invention, the protection scope of the present invention is interpreted by the claims below and All technical ideas within an equivalent range should be construed as being included in the scope of the present invention.

10: data input unit
20: unit price calculator
30: load factor calculation unit
40: cooling load calculation unit
50: movable freezer selection
60: freezer moving part
70: database

Claims (6)

In the operating system of a combined refrigerator including a centrifugal freezer, absorption chiller, ice storage freezer,
A data input unit configured to receive data provided from the outside and store the received information for each type of input information;
A unit price calculator configured to calculate the cost consumed by each refrigerator by a set amount of heat by applying unit price information of each heat source for each time slot to the specifications of the refrigerator when the unit price information for each heat source for each time slot is input through the data input unit;
A load ratio calculator configured to calculate a load ratio for each time zone according to the input external temperature information when external temperature information is input through the data input unit;
A cooling load calculation unit configured to calculate a cooling load to be consumed in a corresponding time period by using the load ratio calculated by the load rate calculation unit;
Selecting the operation refrigerator to determine the minimum number of operation refrigerators that can generate the cooling load more than the lowest in consideration of the cooling load calculated by the cooling load calculation unit, the consumption cost for each refrigerator calculated by the unit price calculation unit part; And
It includes a freezer moving unit for operating the freezer selected for each time zone by the movable refrigerator selection unit in the corresponding time zone,
The movable refrigerator selecting unit determines an ice storage heat operation time through an inverse estimation algorithm of ice storage heat,
The ice heat storage back estimation algorithm is:

Q (t) is a calorific value calculated by integrating the required cumulative energy per hour after assuming a linear change in energy value for each time zone.
delete The method of claim 1,
The centrifugal freezer operates at the moment when the accumulated ice storage system operation capacity is greater than or equal to the capacity of the ice storage system, and simultaneously operates the centrifugal freezer until the total energy of the centrifugal freezer is greater than the centrifugal freezer production (1300RT * Rm). Increasing by one up to the maximum possible number, wherein Rm is the number of centrifugal chillers.
The method of claim 3,
When the total energy of the centrifugal freezer is greater than the production of the centrifugal freezer, the centrifugal freezer in the ice storage freezer is operated, and the remaining cooling energy except the amount of energy produced by the centrifugal freezer is produced by the centrifugal operation of the ice storage freezer. Increasing the number of centrifugal chillers included in the ice storage refrigeration system by one up to the maximum number of simultaneous operation, wherein Rmi is the number of centrifugal freezers included in the ice storage refrigeration freezer. Driving system of combined chiller.
5. The method of claim 4,
The absorption chiller is operated when the cooling energy other than the energy produced by the centrifugal chiller is greater than the amount produced by the centrifugal operation of the ice storage chiller (1300RT * Rmi),
Increase the absorption chillers one by one up to the maximum number of simultaneous operation of the absorption chillers until the cooling energy other than the cooling energy of the centrifugal chillers and the centrifugal chillers of the ice storage system is greater than the yield produced by the absorbing operation (1300 RT * Ra). The operating system of the combined refrigerator characterized in that the number of absorption chillers.
6. The method of claim 5,
When the remaining energy except the cooling energy of the centrifugal freezer and the ice storage freezer is greater than the amount produced by absorption operation (1300RT * Ra), the centrifugal freezer of the ice storage freezer is stopped and the ice storage freezer is operated. Driving system of a combined refrigerator characterized in that.

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