CN116804496A - Control method and system for refrigeration storage refrigerating unit based on carbon dioxide refrigeration - Google Patents

Control method and system for refrigeration storage refrigerating unit based on carbon dioxide refrigeration Download PDF

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Publication number
CN116804496A
CN116804496A CN202311064989.8A CN202311064989A CN116804496A CN 116804496 A CN116804496 A CN 116804496A CN 202311064989 A CN202311064989 A CN 202311064989A CN 116804496 A CN116804496 A CN 116804496A
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China
Prior art keywords
carbon dioxide
liquid carbon
target area
detection period
temperature data
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CN202311064989.8A
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CN116804496B (en
Inventor
韩一博
李宗生
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Jiangsu Xingxing Refrigeration Technology Co Ltd
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Jiangsu Xingxing Refrigeration Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D13/00—Stationary devices, e.g. cold-rooms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/005—Mounting of control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

The invention provides a control method and a control system for a refrigeration house refrigerating unit based on carbon dioxide refrigeration, and relates to the technical field of refrigeration. The method comprises the following steps: obtaining measured temperature data, set temperature and liquid carbon dioxide flow information of a plurality of areas in a refrigeration house; determining a target area according to the measured temperature data and the set temperature; determining the maximum flow rate of liquid carbon dioxide; determining the liquid carbon dioxide flow adjustment quantity of the target area according to the measured temperature data, the set temperature, the liquid carbon dioxide flow information and the liquid carbon dioxide maximum flow of the target area; and determining the liquid carbon dioxide flow information of the target area in the next detection period according to the liquid carbon dioxide flow information and the liquid carbon dioxide flow adjustment quantity of the target area. According to the invention, each area can be distributed to proper liquid carbon dioxide flow, so that each area can reach a set temperature in time, and meanwhile, the whole refrigeration efficiency of the refrigeration house is improved, and electric energy is saved.

Description

Control method and system for refrigeration storage refrigerating unit based on carbon dioxide refrigeration
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration house refrigerating unit control method and system based on carbon dioxide refrigeration.
Background
In a refrigerator group based on carbon dioxide refrigeration, carbon dioxide is compressed in a compressor, and then cooled and compressed into a liquid state by heat dissipation in a condenser. Then, the pressure of the liquid carbon dioxide is reduced through an expansion valve, the liquid carbon dioxide enters an evaporator, the low-pressure liquid carbon dioxide in the evaporator absorbs external heat and is gasified, so that the environment in the refrigerator is cooled, and then the gaseous carbon dioxide is sucked into a compressor again to be circularly reciprocated.
In a large-sized refrigerator having a plurality of partitions, liquid carbon dioxide for refrigeration can be generally distributed according to the volume of each partition, however, different goods stored in each partition may cause different temperature adjustment efficiency of each partition, and distributing liquid carbon dioxide only by volume may cause difficulty in achieving a set temperature in a part of the partitions, thereby failing to achieve a refrigeration effect and failing to keep the goods fresh. And the partial subareas can be cooled too fast, so that electric energy is wasted.
Disclosure of Invention
The embodiment of the invention provides a control method and a control system for a refrigeration house refrigerating unit based on carbon dioxide refrigeration, which can enable each area to be distributed with proper liquid carbon dioxide flow, so that each area can reach a set temperature in time, the probability that goods cannot be preserved is reduced, the overall refrigeration efficiency of the refrigeration house is improved, and electric energy is saved.
According to a first aspect of an embodiment of the present invention, there is provided a refrigeration unit control method based on carbon dioxide refrigeration, including:
respectively acquiring measured temperature data of a plurality of areas in the refrigerator at a plurality of moments in an ith detection period, wherein i is a positive integer;
acquiring set temperatures of a plurality of areas in the refrigerator;
determining liquid carbon dioxide flow information for refrigerating a plurality of areas in the refrigeration house in an ith detection period;
determining a target area which needs to be adjusted on the flow information of the liquid carbon dioxide in the (i+1) th detection period according to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator;
determining the maximum flow of liquid carbon dioxide of a refrigerating unit of the refrigeration house;
determining the liquid carbon dioxide flow adjustment quantity of the target area according to measured temperature data of the target area at a plurality of moments in the ith detection period, set temperature of the target area, liquid carbon dioxide flow information of the target area in the ith detection period and the maximum flow of the liquid carbon dioxide;
and determining the liquid carbon dioxide flow information of the target area in the (i+1) th detection period according to the liquid carbon dioxide flow information of the target area in the (i) th detection period and the liquid carbon dioxide flow adjustment quantity of the target area.
According to one embodiment of the invention, the target area comprises a first target area in which liquid carbon dioxide flow information needs to be increased;
according to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator, determining a target area which needs to adjust the flow information of the liquid carbon dioxide in the (i+1) th detection period, wherein the method comprises the following steps:
according to the formula
A first condition C1, a second condition C2 and a third condition C3 are obtained, wherein,for the measured temperature data detected at the last moment of the ith detection period,is the measured temperature data detected at the first moment of the ith detection period,for the duration of the ith detection period,as a first rate of change threshold value,as a first temperature difference threshold value,as a second rate of change threshold value,as a second temperature difference threshold value,is a set temperature;
if the measured temperature data of the area inside the refrigerator in the ith detection period satisfies any one of the first condition C1, the second condition C2 and the third condition C3, the area is determined as the first target area.
According to one embodiment of the invention, the target area comprises a second target area in which liquid carbon dioxide flow information needs to be subtracted;
According to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator, determining a target area which needs to adjust the flow information of the liquid carbon dioxide in the (i+1) th detection period, wherein the method comprises the following steps:
according to the formula
A fourth condition C4 and a fifth condition C5 are obtained, wherein,for the measured temperature data detected at the last moment of the ith detection period,is the measured temperature data detected at the first moment of the ith detection period,for the duration of the ith detection period,as a third rate of change threshold value,as a third temperature difference threshold value,is a set temperature;
and if the measured temperature data of the area inside the refrigeration house in the ith detection period meets any one of the fourth condition C4 and the fifth condition C5, determining the area as a second target area.
According to one embodiment of the present invention, determining the liquid carbon dioxide flow rate adjustment amount of the target area according to measured temperature data of the target area at a plurality of moments in the ith detection period, a set temperature of the target area, liquid carbon dioxide flow rate information of the target area in the ith detection period, and a maximum flow rate of liquid carbon dioxide includes:
Determining a liquid carbon dioxide regulating and increasing demand range of the first target area according to conditions met by measured temperature data of the first target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the first target area in the ith detection period;
determining a liquid carbon dioxide reduction requirement range of the second target area according to conditions met by measured temperature data of the second target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the second target area in the ith detection period;
setting a liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand range of each first target area, the liquid carbon dioxide adjustment and decrease demand range of each second target area and the liquid carbon dioxide maximum flow;
and determining the liquid carbon dioxide flow adjustment amounts of the first target area and the second target area according to the liquid carbon dioxide flow optimization function.
According to one embodiment of the present invention, determining the liquid carbon dioxide increase demand range of the first target area according to the condition satisfied by the measured temperature data of the first target area in the i-th detection period, the set temperature, and the liquid carbon dioxide flow information of the i-th detection period of the first target area includes:
If the measured temperature data of the first target area in the ith detection period meets the first condition C1, the liquid carbon dioxide increase demand range of the first target area is:
wherein ,the demand is regulated for liquid carbon dioxide in the first target zone,liquid carbon dioxide flow information for the ith detection period of the first target area,is a preset coefficient greater than 1,a flow rate of liquid carbon dioxide such that a temperature of the first target zone is unchanged;
if the measured temperature data of the first target area in the ith detection period meets the second condition C2, the liquid carbon dioxide increase demand range of the first target area is as follows:
wherein ,andare all preset proportional coefficients;
if the measured temperature data of the first target area in the ith detection period meets the third condition C3, the liquid carbon dioxide increase demand range of the first target area is as follows:
wherein ,a preset coefficient greater than 1.
According to one embodiment of the present invention, determining the liquid carbon dioxide subtraction requirement range of the second target area according to the condition satisfied by the measured temperature data of the second target area in the ith detection period, the set temperature, and the liquid carbon dioxide flow information of the ith detection period of the second target area includes:
If the measured temperature data of the second target area in the ith detection period meets the fourth condition C4, the liquid carbon dioxide reduction requirement range of the second target area is as follows:
wherein ,andis a preset proportionality coefficient;
if the measured temperature data of the second target area in the ith detection period meets the fifth condition C5, the liquid carbon dioxide subtraction requirement range of the second target area is:
wherein ,the demand is reduced for liquid carbon dioxide in the second target zone,is a preset proportion coefficient, and the ratio coefficient is a preset proportion coefficient,in order to keep the temperature of the second target zone unchanged.
According to one embodiment of the present invention, setting a liquid carbon dioxide flow optimization function according to a liquid carbon dioxide adjustment and increase demand range of each first target area, a liquid carbon dioxide adjustment and decrease demand range of each second target area, and a liquid carbon dioxide maximum flow includes:
determining constraint conditions of the liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand ranges of the first target areas, the liquid carbon dioxide adjustment and decrease demand ranges of the second target areas and the maximum flow of the liquid carbon dioxide;
Minimizing the sum of the liquid carbon dioxide flow information adjusted by the first target area and the second target area as an objective function of the liquid carbon dioxide flow optimization function;
and determining the liquid carbon dioxide flow optimization function according to the constraint condition and the objective function.
According to a second aspect of an embodiment of the present invention, there is provided a refrigeration unit control system based on carbon dioxide refrigeration, the system comprising:
the system comprises an actual measurement module, a control module and a control module, wherein the actual measurement module is used for respectively acquiring actual measurement temperature data of a plurality of areas in a refrigeration house at a plurality of moments in an ith detection period, wherein i is a positive integer;
the setting module is used for obtaining the set temperatures of a plurality of areas in the refrigerator;
the flow module is used for determining flow information of liquid carbon dioxide for refrigerating a plurality of areas in the refrigeration house in an ith detection period;
the screening module is used for determining a target area which needs to be adjusted on the flow information of the liquid carbon dioxide in the (i+1) th detection period according to the measured temperature data of the plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator;
the maximum flow module is used for determining the maximum flow of liquid carbon dioxide of the refrigerating unit of the refrigeration house;
The adjustment quantity module is used for determining the liquid carbon dioxide flow adjustment quantity of the target area according to the measured temperature data of the target area at a plurality of moments in the ith detection period, the set temperature of the target area, the liquid carbon dioxide flow information of the target area in the ith detection period and the maximum flow of the liquid carbon dioxide;
and the adjusting module is used for determining the liquid carbon dioxide flow information of the target area in the (i+1) th detection period according to the liquid carbon dioxide flow information of the target area in the (i) th detection period and the liquid carbon dioxide flow adjustment quantity of the target area.
According to one embodiment of the invention, the target area comprises a first target area in which liquid carbon dioxide flow information needs to be increased;
the screening module is further to:
according to the formula
A first condition C1, a second condition C2 and a third condition C3 are obtained, wherein,for the measured temperature data detected at the last moment of the ith detection period,is the measured temperature data detected at the first moment of the ith detection period,is the ithThe duration of the detection period is chosen to be the same,as a first rate of change threshold value, As a first temperature difference threshold value,as a second rate of change threshold value,as a second temperature difference threshold value,is a set temperature;
if the measured temperature data of the area inside the refrigerator in the ith detection period satisfies any one of the first condition C1, the second condition C2 and the third condition C3, the area is determined as the first target area.
According to one embodiment of the invention, the target area comprises a second target area in which liquid carbon dioxide flow information needs to be subtracted;
the screening module is further to:
according to the formula
A fourth condition C4 and a fifth condition C5 are obtained, wherein,for the measured temperature data detected at the last moment of the ith detection period,is the measured temperature data detected at the first moment of the ith detection period,for the duration of the ith detection period,as a third rate of change threshold value,as a third temperature difference threshold value,is a set temperature;
and if the measured temperature data of the area inside the refrigeration house in the ith detection period meets any one of the fourth condition C4 and the fifth condition C5, determining the area as a second target area.
According to one embodiment of the invention, the adjustment module is further configured to:
Determining a liquid carbon dioxide regulating and increasing demand range of the first target area according to conditions met by measured temperature data of the first target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the first target area in the ith detection period;
determining a liquid carbon dioxide reduction requirement range of the second target area according to conditions met by measured temperature data of the second target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the second target area in the ith detection period;
setting a liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand range of each first target area, the liquid carbon dioxide adjustment and decrease demand range of each second target area and the liquid carbon dioxide maximum flow;
and determining the liquid carbon dioxide flow adjustment amounts of the first target area and the second target area according to the liquid carbon dioxide flow optimization function.
According to one embodiment of the invention, the adjustment module is further configured to:
if the measured temperature data of the first target area in the ith detection period meets the first condition C1, the liquid carbon dioxide increase demand range of the first target area is:
wherein ,the demand is regulated for liquid carbon dioxide in the first target zone,liquid carbon dioxide flow information for the ith detection period of the first target area,is a preset coefficient greater than 1,a flow rate of liquid carbon dioxide such that a temperature of the first target zone is unchanged;
if the measured temperature data of the first target area in the ith detection period meets the second condition C2, the liquid carbon dioxide increase demand range of the first target area is as follows:
wherein ,andare all preset proportional coefficients;
if the measured temperature data of the first target area in the ith detection period meets the third condition C3, the liquid carbon dioxide increase demand range of the first target area is as follows:
wherein ,a preset coefficient greater than 1.
According to one embodiment of the invention, the adjustment module is further configured to:
if the measured temperature data of the second target area in the ith detection period meets the fourth condition C4, the liquid carbon dioxide reduction requirement range of the second target area is as follows:
wherein ,andis a preset proportionality coefficient;
if the measured temperature data of the second target area in the ith detection period meets the fifth condition C5, the liquid carbon dioxide subtraction requirement range of the second target area is:
wherein ,the demand is reduced for liquid carbon dioxide in the second target zone,is a preset proportion coefficient, and the ratio coefficient is a preset proportion coefficient,in order to keep the temperature of the second target zone unchanged. According to one embodiment of the invention, the adjustment module is further configured to:
determining constraint conditions of the liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand ranges of the first target areas, the liquid carbon dioxide adjustment and decrease demand ranges of the second target areas and the maximum flow of the liquid carbon dioxide;
minimizing the sum of the liquid carbon dioxide flow information adjusted by the first target area and the second target area as an objective function of the liquid carbon dioxide flow optimization function;
and determining the liquid carbon dioxide flow optimization function according to the constraint condition and the objective function.
According to a third aspect of the embodiments of the present invention, there is provided a refrigeration unit control apparatus based on carbon dioxide refrigeration, including: a processor; a memory for storing processor-executable instructions; the processor is configured to call the instructions stored by the memory to execute the refrigeration storage refrigeration unit control method based on carbon dioxide refrigeration.
According to a fourth aspect of embodiments of the present invention, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the refrigeration chiller unit control method based on carbon dioxide refrigeration.
According to the control method of the refrigeration storage refrigerating unit based on carbon dioxide refrigeration, disclosed by the embodiment of the invention, the actually measured temperature of each area in the refrigeration storage can be detected in real time, so that whether the refrigeration efficiency in each area is proper or not can be judged through the actually measured temperature, and further, the liquid carbon dioxide flow information of the area with improper refrigeration efficiency can be timely regulated, so that each area can be distributed to proper liquid carbon dioxide flow, the set temperature can be timely reached, the probability that goods cannot be preserved is reduced, the integral refrigeration efficiency of the refrigeration storage is improved, and electric energy is saved. When judging whether a certain area belongs to the first target area, the conditions can be set based on the actually measured temperature data of the area in the refrigerator in the ith detection period, so that whether the flow of the liquid carbon dioxide needs to be increased in each partition is judged based on the set conditions, and the accuracy and objectivity of judging whether the flow of the liquid carbon dioxide needs to be increased are improved. When judging whether a certain area belongs to the second target area, the conditions can be set based on the actually measured temperature data of the area in the refrigerator in the ith detection period, so that whether the flow of the liquid carbon dioxide needs to be reduced in each partition is judged based on the set conditions, and the accuracy and objectivity of the judgment on whether the flow of the liquid carbon dioxide needs to be reduced are improved. And the liquid carbon dioxide regulating and increasing demand range of the first target area can be determined, the first target area meeting various conditions can be regulated in the corresponding liquid carbon dioxide regulating and increasing demand range, the first target area can be close to the set temperature and kept near the set temperature in the next detection period, the temperature regulation accuracy is improved, and the fresh-keeping capability of the first target area is improved. The liquid carbon dioxide regulating and reducing requirement range of the second target area can be set, so that the second target area meeting various conditions can be regulated in the corresponding liquid carbon dioxide regulating and reducing requirement range, the second target area can be close to and kept near the set temperature in the next detection period, the temperature regulation accuracy is improved, the temperature can not be greatly lower than the set temperature, and the electric energy waste is reduced. Further, a liquid carbon dioxide flow optimization function can be set based on the above range to solve the liquid carbon dioxide flow adjustment amount, so that energy consumption can be reduced on the basis of guaranteeing the refrigeration effect of each area.
Drawings
In order to more clearly illustrate the embodiments of the invention or the solutions of the prior art, the drawings which are necessary for the description of the embodiments or the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other embodiments may be obtained from these drawings without inventive effort to a person skilled in the art,
FIG. 1 schematically illustrates a flow diagram of a method for controlling a refrigeration unit of a refrigeration storage based on carbon dioxide refrigeration according to an embodiment of the invention;
fig. 2 schematically illustrates a schematic diagram of a refrigeration unit control system based on carbon dioxide refrigeration according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 schematically shows a flow chart of a method for controlling a refrigeration unit of a refrigeration house based on carbon dioxide refrigeration, according to an embodiment of the invention, the method includes:
step S101, respectively acquiring measured temperature data of a plurality of areas in a refrigerator at a plurality of moments in an ith detection period, wherein i is a positive integer;
step S102, acquiring set temperatures of a plurality of areas in the refrigerator;
step S103, determining liquid carbon dioxide flow information for refrigerating a plurality of areas in the refrigeration house in an ith detection period;
step S104, determining a target area which needs to regulate the flow information of the liquid carbon dioxide in the (i+1) th detection period according to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator;
step 105, determining the maximum flow of liquid carbon dioxide of a refrigerating unit of the refrigeration house;
step S106, determining the liquid carbon dioxide flow adjustment quantity of the target area according to the measured temperature data of the target area at a plurality of moments in the ith detection period, the set temperature of the target area, the liquid carbon dioxide flow information of the target area in the ith detection period and the maximum flow of the liquid carbon dioxide;
Step S107, determining the liquid carbon dioxide flow information of the target area in the (i+1) th detection period according to the liquid carbon dioxide flow information of the target area in the (i) th detection period and the liquid carbon dioxide flow adjustment quantity of the target area.
According to an embodiment of the present invention, in step S101, the duration of each detection period may be 10 minutes, 15 minutes, 30 minutes, etc., and the duration of each detection period is not limited by the present invention, and each detection period may include a plurality of time instants, each of which may detect measured temperature data of each region through a temperature sensor disposed in each region in the refrigerator, and each time instant may be separated by 10 seconds, 30 seconds, 1 minute, etc., and the interval duration between time instants at which measured temperature data is collected is not limited by the present invention. In the ith detection period, measured temperature data in each zone may be acquired at a plurality of times, respectively.
According to one embodiment of the present invention, in step S102, the refrigerator may be divided into a plurality of areas for storing different types of goods, and thus, a set temperature of each area, for example, a temperature suitable for preserving goods in the area may be set.
According to an embodiment of the present invention, in step S103, the flow information of the liquid carbon dioxide for refrigerating the plurality of areas in the refrigerator in the current ith detection period may be obtained, and in a certain area of the refrigerator, the refrigerating effect achieved by the current flow information of the liquid carbon dioxide may be applicable to the area or may not be applicable, for example, the refrigerating efficiency is insufficient, so that the temperature is difficult to reach the set temperature, the goods cannot be preserved, or the refrigerating efficiency is too high, so that the electric energy is wasted, etc.
According to an embodiment of the present invention, in step S104, a region with an inappropriate cooling effect of the liquid carbon dioxide may be selected from a plurality of regions of the refrigerator as a target region, so that the liquid carbon dioxide flow rate information of the target region may be adjusted.
According to one embodiment of the invention, the target area includes a first object requiring an augmentation of liquid carbon dioxide flow informationA target area; that is, the first target region is a region where the cooling efficiency of the liquid carbon dioxide is insufficient, and the flow rate of the liquid carbon dioxide needs to be adjusted. Step S104 may include: according to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator, determining a target area which needs to adjust the flow information of the liquid carbon dioxide in the (i+1) th detection period, wherein the method comprises the following steps: according to formula (1), a first condition C1, a second condition C2 and a third condition C3 are obtained, （1） wherein ,for the measured temperature data detected at the last moment of the ith detection period,is the measured temperature data detected at the first moment of the ith detection period,for the duration of the ith detection period,as a first rate of change threshold value,as a first temperature difference threshold value,as a second rate of change threshold value,as a second temperature difference threshold value,is a set temperature; if the measured temperature data of the area inside the refrigerator in the ith detection period satisfies any one of the first condition C1, the second condition C2 and the third condition C3, the area is determined as the first target area.
According to one embodiment of the present invention, in the formula (1), the first condition C1 is used to describe that the measured temperature in the region where the i-th detection period ends has not reached the set temperature (i.e., is higher than the set temperature), and the difference between the measured temperature and the set temperature is large (i.e., is greater than or equal to the first temperature difference threshold), in which case, although the measured temperature continuously decreases in the i-th detection period (i.e., the measured temperature data detected at the last time of the i-th detection period is lower than the measured temperature data detected at the first time of the i-th detection period), the rate of temperature decrease is small (i.e., is less than or equal to the first change rate threshold), so that if the region does not reach the set temperature in accordance with the current temperature decrease rate, the cooling efficiency of the liquid carbon dioxide in the region may be determined to be insufficient in the future (e.g., in one or more detection periods).
According to one embodiment of the present invention, in the formula (1), the second condition C2 is used to describe that although the measured temperature in the region at the end of the ith detection period is lower than the set temperature, the amplitude lower than the set temperature is smaller (i.e. lower than or equal to the second temperature difference threshold), but the measured temperature continuously rises in the ith detection period (i.e. the measured temperature data detected at the last time of the ith detection period is higher than the measured temperature data detected at the first time of the ith detection period), and the rate of temperature rise is larger (i.e. higher than or equal to the second change rate threshold), so that if the region rises at the current temperature rise rate, in a shorter time in the future (e.g. in one detection period in the future), the temperature will be higher than the set temperature and the amplitude higher than the set temperature is larger, so that it is difficult to keep the goods fresh, and therefore, it is possible to determine that the cooling efficiency of the liquid carbon dioxide in the region is insufficient, and the flow of the liquid carbon dioxide needs to be increased.
According to one embodiment of the present invention, in the formula (1), the third condition C3 is used to describe that the measured temperature in the region where the i-th detection period ends has not reached the set temperature (i.e., is higher than the set temperature), and in this state, the measured temperature continuously rises in the i-th detection period (i.e., the measured temperature data detected at the last time of the i-th detection period is higher than the measured temperature data detected at the first time of the i-th detection period), so that the temperature in the region cannot reach the set temperature in the future, and it is difficult to keep the cargo fresh, and therefore, it may be determined that the refrigeration efficiency of the liquid carbon dioxide in the region is insufficient, and it is necessary to increase the flow rate of the liquid carbon dioxide.
According to one embodiment of the present invention, if the measured temperature data of a certain area in the refrigerator in the ith detection period satisfies any one of the first condition C1, the second condition C2 and the third condition C3, it may be determined that the cooling efficiency of the liquid carbon dioxide in the area is insufficient, and the flow rate of the liquid carbon dioxide needs to be increased, that is, the area is determined as the first target area. Whether the measured temperature data in the ith detection period of all areas in the refrigerator meets any one of the first condition C1, the second condition C2 and the third condition C3 can be judged, so that all first target areas are determined.
In this way, the conditions can be set based on the measured temperature data of the area in the refrigerator in the ith detection period, so that whether the flow rate of the liquid carbon dioxide needs to be increased in each partition is judged based on the set conditions, and the accuracy and objectivity of the judgment on whether the flow rate of the liquid carbon dioxide needs to be increased are improved.
According to an embodiment of the present invention, the first target area where the flow rate information of the liquid carbon dioxide needs to be adjusted and increased is determined, and the second target area where the flow rate information of the liquid carbon dioxide needs to be adjusted and reduced may be determined.
According to one embodiment of the present invention, step S104 may include: according to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator, determining a target area which needs to adjust the flow information of the liquid carbon dioxide in the (i+1) th detection period, wherein the method comprises the following steps: according to formula (2), a fourth condition C4 and a fifth condition C5 are obtained,
（2）
wherein ,for the measured temperature data detected at the last moment of the ith detection period,is the measured temperature data detected at the first moment of the ith detection period,for the duration of the ith detection period,as a third rate of change threshold value,as a third temperature difference threshold value,is a set temperature; and if the measured temperature data of the area inside the refrigeration house in the ith detection period meets any one of the fourth condition C4 and the fifth condition C5, determining the area as a second target area.
According to one embodiment of the present invention, in the formula (2), the fourth condition C4 is used to describe that the measured temperature in the region where the i-th detection period ends is already lower than the set temperature, and in this state, the measured temperature continuously decreases in the i-th detection period (i.e., the measured temperature data detected at the last time of the i-th detection period is lower than the measured temperature data detected at the first time of the i-th detection period), so that the temperature in the region will be lower and lower in the future, deviate from the set temperature, and the temperature is too low, resulting in waste of electric energy, and therefore, it can be determined that the refrigeration efficiency of the liquid carbon dioxide in the region is too high, and it is required to reduce the flow rate of the liquid carbon dioxide.
According to one embodiment of the present invention, in the formula (2), the fifth condition C5 is used to describe that the measured temperature in the region where the i-th detection period ends is higher than the set temperature, but the amplitude higher than the set temperature is smaller (for example, smaller than or equal to the third temperature difference threshold), and the measured temperature continuously decreases in the i-th detection period (that is, the measured temperature data detected at the last time of the i-th detection period is lower than the measured temperature data detected at the first time of the i-th detection period), and the rate of temperature decrease is larger (that is, greater than or equal to the third change rate threshold), so that the temperature in the region is significantly lower than the set temperature in a shorter time in the future (for example, in a future detection period), that is, the deviation from the set temperature is larger, the temperature is too low, resulting in a waste of electric energy, and therefore, it can be determined that the cooling efficiency of the liquid carbon dioxide in the region is too high, and the flow of the liquid carbon dioxide needs to be reduced.
According to one embodiment of the invention, if the measured temperature data of a certain area in the refrigerator in the ith detection period meets any one of the fourth condition C5 and the fifth condition C5, it can be judged that the refrigeration efficiency of the liquid carbon dioxide in the area is too high, and the flow rate of the liquid carbon dioxide needs to be reduced, namely, the area is determined as the second target area. Whether the measured temperature data in the ith detection period of all the areas in the refrigerator meets any one of the fourth condition C5 and the fifth condition C5 can be judged, so that all the second target areas are determined.
In this way, the conditions can be set based on the measured temperature data of the area in the refrigerator in the ith detection period, so that whether the flow of the liquid carbon dioxide needs to be reduced in each partition is judged based on the set conditions, and the accuracy and objectivity of the judgment on whether the flow of the liquid carbon dioxide needs to be reduced are improved.
According to one embodiment of the present invention, in step S105, the maximum flow rate of liquid carbon dioxide of the refrigeration unit of the refrigeration house may be obtained, so that when the liquid carbon dioxide flow rate information of each region of the future time period (for example, the i+1th detection period) is set, the sum of the liquid carbon dioxide flow rate information of each region is smaller than or equal to the maximum flow rate of liquid carbon dioxide of the refrigeration unit of the refrigeration house.
According to an embodiment of the present invention, after the above first target area and second target area are determined in step S106, the adjustment amount of the liquid carbon dioxide flow rate of the target area, that is, the adjustment amount of the liquid carbon dioxide flow rate for the first target area and the adjustment amount of the liquid carbon dioxide flow rate for the first target area may be determined according to the measured temperature data of the target area at a plurality of times in the i-th detection period, the set temperature of the target area, the liquid carbon dioxide flow rate information of the target area in the i-th detection period, and the maximum flow rate of the liquid carbon dioxide.
According to one embodiment of the present invention, step S106 may include: determining a liquid carbon dioxide regulating and increasing demand range of the first target area according to conditions met by measured temperature data of the first target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the first target area in the ith detection period; determining a liquid carbon dioxide reduction requirement range of the second target area according to conditions met by measured temperature data of the second target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the second target area in the ith detection period; setting a liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand range of each first target area, the liquid carbon dioxide adjustment and decrease demand range of each second target area and the liquid carbon dioxide maximum flow; and determining the liquid carbon dioxide flow adjustment amounts of the first target area and the second target area according to the liquid carbon dioxide flow optimization function.
According to an embodiment of the present invention, a range may be set for the liquid carbon dioxide flow rate adjustment amount of the first target region such that when the increase of the liquid carbon dioxide flow rate of the first target region is within the range, the temperature of the first target region in the (i+1) -th detection period may be brought to the set temperature or to a certain interval range around the set temperature. Therefore, the temperature of the first target area can be kept near the set temperature, and the articles in the first target area can be kept fresh.
According to one embodiment of the present invention, if the measured temperature data of the first target area in the ith detection period satisfies the first condition C1, the liquid carbon dioxide increase demand range of the first target area is the following formula (3):
（3）
wherein ,the demand is regulated for liquid carbon dioxide in the first target zone,liquid carbon dioxide flow information for the ith detection period of the first target area,is a preset coefficient greater than 1,a flow rate of liquid carbon dioxide such that a temperature of the first target zone is unchanged;
if the measured temperature data of the first target area in the ith detection period meets the second condition C2, the liquid carbon dioxide increase demand range of the first target area is as follows (4):
（4）
wherein ,andare all preset proportional coefficients;
if the measured temperature data of the first target area in the ith detection period meets the third condition C3, the liquid carbon dioxide increase demand range of the first target area is as follows (5):
（5）
wherein ,a preset coefficient greater than 1.
According to one embodiment of the present invention, if the measured temperature data of the first target area in the ith detection period satisfies the first condition C1, it indicates that the measured temperature of the first target area does not reach the set temperature, and the temperature drop speed is slower, and the set temperature cannot be reached in one or more detection periods in the future, so the flow rate of the liquid carbon dioxide can be increased, and the temperature drop speed can be increased, so that the set temperature is reached before the end of the next detection period. Assuming that the temperature in the first target area of the refrigerator uniformly changes, and the rate of temperature decrease is proportional to the difference between the information of the liquid carbon dioxide flow rate in the i-th detection period of the first target area and the liquid carbon dioxide flow rate in the first target area, the temperature of the first target area is not changed, the lower boundary of the liquid carbon dioxide regulation and increase demand range based on the formula (3)
(i.e.,) The determined increment of the flow rate of the liquid carbon dioxide can increase the temperature falling speed of the first target area, and the temperature of the first target area reaches the set temperature when the (i+1) th detection period is finished. On the other hand, in order to prevent the temperature of the first target area from dropping too fast, the upper boundary of the liquid carbon dioxide increase demand range may be set (i.e.,），
that is, the temperature drop in the (i+1) th detection period is of the magnitude ofIn other words, the temperature of the first target regionThe time when the temperature is reduced to the set temperature is the duration of the whole detection period。
According to one embodiment of the present invention, if the measured temperature data of the first target area in the ith detection period satisfies the second condition C2, it means that the measured temperature of the first target area will rise above the set temperature in a short period (for example, in a future detection period) and the amplitude above the set temperature is large. Therefore, the flow rate of the liquid carbon dioxide can be increased, so that the temperature rising speed is reduced, but because the measured temperature data of the first target area in the ith detection period is lower than the set temperature, the upper limit of the flow rate of the liquid carbon dioxide is set, so that the temperature in the first target area cannot continuously drop. In equation (4), the liquid carbon dioxide based on equation (4) adjusts the lower boundary of the demand range (i.e., ) The determined increment of the flow rate of the liquid carbon dioxide can slow down the temperature rising speed of the first target area, and the temperature of the first target area rises to the maximum at the end of the (i+1) th detection periodI.e. above the set temperature of the amplitude of, wherein ,the smaller coefficient may be set so that the deviation of the temperature in the first target region from the set temperature is smaller in the i+1th detection period. On the other hand, the liquid carbon dioxide based on equation (4) increases the upper boundary of the demand range (i.e.,) The determined increment of the flow of the liquid carbon dioxide can increase the temperature of the first target areaA slow down, at the end of the (i+1) th detection period, the temperature of the first target region rises to at most，
That is, the amplitude lower than the set temperature is, wherein ,the smaller coefficient may be set so that the deviation of the temperature in the first target region from the set temperature is smaller in the i+1th detection period.
According to one embodiment of the present invention, if the measured temperature data of the first target area in the ith detection period satisfies the third condition C3, it means that the temperature in the first target area does not reach the set temperature, but rises, and the difference from the set temperature is larger and larger. Therefore, the flow rate of the liquid carbon dioxide can be increased to bring the temperature in the first target region close to the set temperature. The temperature of the first target area can be changed from rising to falling based on the increment of the flow rate of the liquid carbon dioxide determined by the lower boundary of the liquid carbon dioxide adjustment and increase demand range in the formula (5), and the temperature of the first target area can reach the set temperature when the (i+1) th detection period is finished. In order to prevent the temperature drop rate of the first target region from being too high, the upper boundary of the liquid carbon dioxide regulating and increasing demand range can be set, and the temperature drop range in the (i+1) th detection period is The time for the temperature of the first target area to drop to the set temperature is the duration of the whole detection period。
By the method, the liquid carbon dioxide regulating and increasing demand range of the first target area can be set, so that the first target area meeting various conditions can be regulated in the corresponding liquid carbon dioxide regulating and increasing demand range, the first target area can be close to the set temperature and kept near the set temperature in the next detection period, the temperature regulation accuracy is improved, and the fresh-keeping capacity of the first target area is improved.
According to one embodiment of the present invention, a range may be set for the liquid carbon dioxide flow rate adjustment amount of the second target region such that the temperature decrease speed of the second target region in the (i+1) -th detection period is slowed down and maintained near the set temperature when the increase amount of the liquid carbon dioxide flow rate of the second target region is within the range. Thereby saving electrical energy on the basis of enabling the cargo in the second target area to be preserved.
According to one embodiment of the present invention, determining the liquid carbon dioxide subtraction requirement range of the second target area according to the condition satisfied by the measured temperature data of the second target area in the ith detection period, the set temperature, and the liquid carbon dioxide flow information of the ith detection period of the second target area includes: if the measured temperature data of the second target area in the ith detection period satisfies the fourth condition C4, the liquid carbon dioxide reduction requirement range of the second target area is the following formula (6):
（6）
wherein ,andis a preset proportionality coefficient;
if the measured temperature data of the second target area in the ith detection period satisfies the fifth condition C5, the liquid carbon dioxide reduction requirement range of the second target area is the following formula (7):
（7）
wherein ,the demand is reduced for liquid carbon dioxide in the second target zone,is a preset proportion coefficient, and the ratio coefficient is a preset proportion coefficient,in order to keep the temperature of the second target zone unchanged.
According to one embodiment of the present invention, if the measured temperature data of the second target area in the ith detection period satisfies the fourth condition C4, it means that the temperature of the second target area is already lower than the set temperature and is still continuously decreasing, so that the flow rate of liquid carbon dioxide in the second target area can be reduced, and the temperature decrease rate in the second target area can be slowed down and kept around the set temperature. The liquid carbon dioxide based on equation (6) adjusts the lower boundary of the demand range (i.e.,) The determined adjustment and reduction of the flow rate of the liquid carbon dioxide can lead the temperature of the second target area not to drop any more, and lead the temperature of the second target area to rise to the following (i+1) th detection periodI.e. below the set temperature of amplitude ，The smaller coefficient may be set so that the temperature in the second target region approaches the set temperature in the i+1th detection period. On the other hand, the liquid carbon dioxide based on equation (6) increases the upper boundary of the demand range (i.e.,) The determined adjustment and reduction of the flow rate of the liquid carbon dioxide can enable the secondThe temperature of the target area is not reduced any more, and at the end of the (i+1) th detection period, the temperature of the second target area is increased to，The smaller coefficient may be set so that the temperature in the second target region approaches the set temperature in the i+1th detection period.
According to an embodiment of the present invention, if the measured temperature data of the second target area in the ith detection period satisfies the fifth condition C5, it indicates that the temperature of the second target area drops too fast, and may drop below the set temperature in a short time in the future, and the temperature may be significantly lower than the set temperature, resulting in waste of electric energy. Therefore, the flow rate of the liquid carbon dioxide in the second target area can be reduced, so that the temperature falling speed in the second target area is slowed down and kept near the set temperature. The liquid carbon dioxide based on equation (7) adjusts the lower boundary of the demand range (i.e., ) The determined adjustment and reduction of the flow rate of the liquid carbon dioxide can slow down the temperature drop speed of the second target area and reach the set temperature at the end of the (i+1) th detection period. On the other hand, the liquid carbon dioxide based on equation (7) increases the upper boundary of the demand range (i.e.,) The determined adjustment and reduction of the flow rate of the liquid carbon dioxide can slow down the temperature of the second target area and reduce the temperature of the second target area to the temperature at the end of the (i+1) th detection period，Can be set to a smaller coefficient so that the temperature in the second target region approaches in the (i+1) th detection periodSetting a temperature.
By the method, the liquid carbon dioxide reduction requirement range of the second target area can be set, so that the second target area meeting various conditions can be regulated in the corresponding liquid carbon dioxide reduction requirement range, the second target area can be close to and kept near the set temperature in the next detection period, the temperature regulation accuracy is improved, the temperature can not be greatly lower than the set temperature, and the electric energy waste is reduced.
According to an embodiment of the present invention, after the above liquid carbon dioxide adjustment and increase demand range of the first target area and the liquid carbon dioxide adjustment and decrease demand range of the second target area are obtained, an optimal adjustment amount may be determined in the above ranges as the liquid carbon dioxide flow adjustment amount of each target area. For example, to save energy, the sum of the adjusted liquid carbon dioxide flow information can be minimized as a target, so that the optimal adjustment amount can be solved, and the energy consumption can be reduced on the basis of ensuring the refrigeration effect of each area.
According to one embodiment of the present invention, setting a liquid carbon dioxide flow optimization function according to a liquid carbon dioxide adjustment and increase demand range of each first target area, a liquid carbon dioxide adjustment and decrease demand range of each second target area, and a liquid carbon dioxide maximum flow includes: determining constraint conditions of the liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand ranges of the first target areas, the liquid carbon dioxide adjustment and decrease demand ranges of the second target areas and the maximum flow of the liquid carbon dioxide; minimizing the sum of the liquid carbon dioxide flow information adjusted by the first target area and the second target area as an objective function of the liquid carbon dioxide flow optimization function; and determining the liquid carbon dioxide flow optimization function according to the constraint condition and the objective function.
According to an embodiment of the present invention, the liquid carbon dioxide adjustment requirement range of each first target area may be used as a constraint condition of the liquid carbon dioxide flow adjustment amount of each first target area, that is, the liquid carbon dioxide flow adjustment amount of each first target area falls within the liquid carbon dioxide adjustment requirement range of the first target area. And the liquid carbon dioxide adjustment requirement range of each second target area can be used as a constraint condition of the liquid carbon dioxide flow adjustment quantity of each second target area, namely, the liquid carbon dioxide flow adjustment quantity of each second target area belongs to the liquid carbon dioxide adjustment requirement range of the second target area. Further, the adjusted liquid carbon dioxide flow rate of each first target area (i.e., the liquid carbon dioxide flow rate information of the first target area in the ith detection period is added to the liquid carbon dioxide flow rate adjustment amount thereof), the adjusted liquid carbon dioxide flow rate of each second target area (i.e., the liquid carbon dioxide flow rate information of the second target area in the ith detection period is subtracted from the liquid carbon dioxide flow rate adjustment amount thereof), and the liquid carbon dioxide flow rate information of each area not belonging to the target area in the ith detection period may be summed, and the sum result is less than or equal to the maximum liquid carbon dioxide flow rate as a constraint condition. The above constraints may be used as constraints for the liquid carbon dioxide flow optimization function.
According to an embodiment of the present invention, since the liquid carbon dioxide flow rate information of each region that does not belong to the target region in the i-th detection period is not optimized and adjusted, it is possible to minimize the sum of the adjusted liquid carbon dioxide flow rate information of the adjusted first target region and the second target region as an objective function of the liquid carbon dioxide flow rate optimizing function, that is, to sum the adjusted liquid carbon dioxide flow rate of each first target region (that is, the liquid carbon dioxide flow rate information of the first target region in the i-th detection period and the liquid carbon dioxide flow rate adjusting amount thereof) with the adjusted liquid carbon dioxide flow rate of each second target region (that is, the liquid carbon dioxide flow rate information of the second target region in the i-th detection period and the liquid carbon dioxide flow rate adjusting amount thereof) and to minimize the result of the sum as an objective function of the liquid carbon dioxide flow rate optimizing function. The method can exclude the area which is not changed in the process of setting the objective function, can save the operation amount and improve the operation efficiency.
According to one embodiment of the invention, the above constraints and objective functions may constitute a liquid carbon dioxide flow optimization function. Therefore, under the constraint of the constraint condition, the objective function is taken as an optimization target, and each parameter in the liquid carbon dioxide flow optimization function is optimized, so that the liquid carbon dioxide flow adjustment amounts of the first target area and the second target area can be obtained, namely, the optimal liquid carbon dioxide flow adjustment amount closest to the objective function in the constraint range of the constraint condition. In the optimization process, an optimization algorithm such as a particle swarm optimization algorithm, a simulated annealing algorithm, a random gradient descent method and the like can be used for searching an optimal solution of the liquid carbon dioxide flow optimization function, namely, the liquid carbon dioxide flow adjustment amounts of the first target area and the second target area. The invention is not limited by the particular type of optimization algorithm used in the optimization process.
According to an embodiment of the present invention, in step S107, after determining the adjustment amount of the liquid carbon dioxide flow rate of each target area, the liquid carbon dioxide flow rate information of each target area in the i-th detection period may be adjusted, so as to obtain the liquid carbon dioxide flow rate information of the target area in the i+1th detection period.
According to the control method of the refrigeration storage refrigerating unit based on carbon dioxide refrigeration, disclosed by the embodiment of the invention, the actually measured temperature of each area in the refrigeration storage can be detected in real time, so that whether the refrigeration efficiency in each area is proper or not can be judged through the actually measured temperature, and further, the liquid carbon dioxide flow information of the area with improper refrigeration efficiency can be timely regulated, so that each area can be distributed to proper liquid carbon dioxide flow, the set temperature can be timely reached, the probability that goods cannot be preserved is reduced, the integral refrigeration efficiency of the refrigeration storage is improved, and electric energy is saved. When judging whether a certain area belongs to the first target area, the conditions can be set based on the actually measured temperature data of the area in the refrigerator in the ith detection period, so that whether the flow of the liquid carbon dioxide needs to be increased in each partition is judged based on the set conditions, and the accuracy and objectivity of judging whether the flow of the liquid carbon dioxide needs to be increased are improved. When judging whether a certain area belongs to the second target area, the conditions can be set based on the actually measured temperature data of the area in the refrigerator in the ith detection period, so that whether the flow of the liquid carbon dioxide needs to be reduced in each partition is judged based on the set conditions, and the accuracy and objectivity of the judgment on whether the flow of the liquid carbon dioxide needs to be reduced are improved. And the liquid carbon dioxide regulating and increasing demand range of the first target area can be determined, the first target area meeting various conditions can be regulated in the corresponding liquid carbon dioxide regulating and increasing demand range, the first target area can be close to the set temperature and kept near the set temperature in the next detection period, the temperature regulation accuracy is improved, and the fresh-keeping capability of the first target area is improved. The liquid carbon dioxide regulating and reducing requirement range of the second target area can be set, so that the second target area meeting various conditions can be regulated in the corresponding liquid carbon dioxide regulating and reducing requirement range, the second target area can be close to and kept near the set temperature in the next detection period, the temperature regulation accuracy is improved, the temperature can not be greatly lower than the set temperature, and the electric energy waste is reduced. Further, a liquid carbon dioxide flow optimization function can be set based on the above range to solve the liquid carbon dioxide flow adjustment amount, so that energy consumption can be reduced on the basis of guaranteeing the refrigeration effect of each area.
Fig. 2 schematically illustrates a schematic diagram of a refrigeration unit control system based on carbon dioxide refrigeration according to an embodiment of the present invention, as shown in fig. 2, the system includes:
the actual measurement module 101 is configured to obtain actual measurement temperature data of a plurality of areas in the refrigerator at a plurality of moments in an ith detection period, where i is a positive integer;
the setting module 102 is used for obtaining the set temperatures of a plurality of areas in the refrigerator;
a flow module 103, configured to determine flow information of liquid carbon dioxide for refrigerating a plurality of areas in the refrigerator in an ith detection period;
the screening module 104 is configured to determine a target area in which the liquid carbon dioxide flow information needs to be adjusted in the (i+1) th detection period according to the measured temperature data of the plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator;
a maximum flow module 105, configured to determine a maximum flow rate of liquid carbon dioxide in a refrigeration unit of the refrigeration house;
an adjustment amount module 106, configured to determine a liquid carbon dioxide flow adjustment amount of the target area according to measured temperature data of the target area at a plurality of moments in an i-th detection period, a set temperature of the target area, liquid carbon dioxide flow information of the target area in the i-th detection period, and a maximum flow of liquid carbon dioxide;
And the adjusting module 107 is configured to determine the liquid carbon dioxide flow information of the target area in the (i+1) th detection period according to the liquid carbon dioxide flow information of the target area in the (i) th detection period and the liquid carbon dioxide flow adjustment amount of the target area.
According to one embodiment of the invention, the target area comprises a first target area in which liquid carbon dioxide flow information needs to be increased;
the screening module is further to:
according to the formula
A first condition C1, a second condition C2 and a third condition C3 are obtained, wherein,for the measured temperature data detected at the last moment of the ith detection period,is the measured temperature data detected at the first moment of the ith detection period,for the duration of the ith detection period,as a first rate of change threshold value,as a first temperature difference threshold value,as a second rate of change threshold value,as a second temperature difference threshold value,is a set temperature;
if the measured temperature data of the area inside the refrigerator in the ith detection period satisfies any one of the first condition C1, the second condition C2 and the third condition C3, the area is determined as the first target area.
According to one embodiment of the invention, the target area comprises a second target area in which liquid carbon dioxide flow information needs to be subtracted;
the screening module is further to:
according to the formula
A fourth condition C4 and a fifth condition C5 are obtained, wherein,for the measured temperature data detected at the last moment of the ith detection period,is the measured temperature data detected at the first moment of the ith detection period,for the duration of the ith detection period,as a third rate of change threshold value,as a third temperature difference threshold value,is a set temperature;
and if the measured temperature data of the area inside the refrigeration house in the ith detection period meets any one of the fourth condition C4 and the fifth condition C5, determining the area as a second target area.
According to one embodiment of the invention, the adjustment module is further configured to:
determining a liquid carbon dioxide regulating and increasing demand range of the first target area according to conditions met by measured temperature data of the first target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the first target area in the ith detection period;
Determining a liquid carbon dioxide reduction requirement range of the second target area according to conditions met by measured temperature data of the second target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the second target area in the ith detection period;
setting a liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand range of each first target area, the liquid carbon dioxide adjustment and decrease demand range of each second target area and the liquid carbon dioxide maximum flow;
and determining the liquid carbon dioxide flow adjustment amounts of the first target area and the second target area according to the liquid carbon dioxide flow optimization function.
According to one embodiment of the invention, the adjustment module is further configured to:
if the measured temperature data of the first target area in the ith detection period meets the first condition C1, the liquid carbon dioxide increase demand range of the first target area is:
wherein ,the demand is regulated for liquid carbon dioxide in the first target zone,liquid carbon dioxide flow information for the ith detection period of the first target area, Is a preset coefficient greater than 1,a flow rate of liquid carbon dioxide such that a temperature of the first target zone is unchanged;
if the measured temperature data of the first target area in the ith detection period meets the second condition C2, the liquid carbon dioxide increase demand range of the first target area is as follows:
wherein ,andare all preset proportional coefficients;
if the measured temperature data of the first target area in the ith detection period meets the third condition C3, the liquid carbon dioxide increase demand range of the first target area is as follows:
wherein ,a preset coefficient greater than 1.
According to one embodiment of the invention, the adjustment module is further configured to:
if the measured temperature data of the second target area in the ith detection period meets the fourth condition C4, the liquid carbon dioxide reduction requirement range of the second target area is as follows:
wherein ,andis a preset proportionality coefficient;
if the measured temperature data of the second target area in the ith detection period meets the fifth condition C5, the liquid carbon dioxide subtraction requirement range of the second target area is:
wherein ,the demand is reduced for liquid carbon dioxide in the second target zone,is a preset proportion coefficient, and the ratio coefficient is a preset proportion coefficient, In order to keep the temperature of the second target zone unchanged. According to one embodiment of the invention, the adjustment module is further configured to:
determining constraint conditions of the liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand ranges of the first target areas, the liquid carbon dioxide adjustment and decrease demand ranges of the second target areas and the maximum flow of the liquid carbon dioxide;
minimizing the sum of the liquid carbon dioxide flow information adjusted by the first target area and the second target area as an objective function of the liquid carbon dioxide flow optimization function;
and determining the liquid carbon dioxide flow optimization function according to the constraint condition and the objective function.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (8)

1. The control method of the refrigeration house refrigerating unit based on carbon dioxide refrigeration is characterized by comprising the following steps:
respectively acquiring measured temperature data of a plurality of areas in the refrigerator at a plurality of moments in an ith detection period, wherein i is a positive integer;
acquiring set temperatures of a plurality of areas in the refrigerator;
determining liquid carbon dioxide flow information for refrigerating a plurality of areas in the refrigeration house in an ith detection period;
determining a target area which needs to be adjusted on the flow information of the liquid carbon dioxide in the (i+1) th detection period according to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator;
determining the maximum flow of liquid carbon dioxide of a refrigerating unit of the refrigeration house;
determining the liquid carbon dioxide flow adjustment quantity of the target area according to measured temperature data of the target area at a plurality of moments in the ith detection period, set temperature of the target area, liquid carbon dioxide flow information of the target area in the ith detection period and the maximum flow of the liquid carbon dioxide;
and determining the liquid carbon dioxide flow information of the target area in the (i+1) th detection period according to the liquid carbon dioxide flow information of the target area in the (i) th detection period and the liquid carbon dioxide flow adjustment quantity of the target area.
2. The method for controlling a refrigeration unit of a refrigeration house based on carbon dioxide refrigeration according to claim 1, wherein the target area comprises a first target area in which liquid carbon dioxide flow information is required to be adjusted and increased;
according to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator, determining a target area which needs to adjust the flow information of the liquid carbon dioxide in the (i+1) th detection period, wherein the method comprises the following steps:
according to the formula
Obtaining a first condition C1, a second condition C2 and a third condition C3, wherein,/-A>For the measured temperature data detected at the last moment of the ith detection period,/th detection period>For the measured temperature data detected at the first moment of the ith detection period, +.>For the duration of the ith detection period, < +.>For a first rate threshold,/>Is the firstTemperature difference threshold, < >>For a second rate threshold,>for the second temperature difference threshold, +.>Is a set temperature;
if the measured temperature data of the area inside the refrigerator in the ith detection period satisfies any one of the first condition C1, the second condition C2 and the third condition C3, the area is determined as the first target area.
3. The method for controlling a refrigeration unit of a refrigeration house based on carbon dioxide refrigeration according to claim 2, wherein the target area includes a second target area in which the flow information of liquid carbon dioxide is required to be subtracted;
according to the measured temperature data of a plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator, determining a target area which needs to adjust the flow information of the liquid carbon dioxide in the (i+1) th detection period, wherein the method comprises the following steps:
according to the formula
Obtaining a fourth condition C4 and a fifth condition C5, wherein->For the measured temperature data detected at the last moment of the ith detection period,/th detection period>For the measured temperature data detected at the first moment of the ith detection period, +.>For the duration of the ith detection period, < +.>For a third rate threshold,>for a third temperature difference threshold, +.>Is a set temperature;
and if the measured temperature data of the area inside the refrigeration house in the ith detection period meets any one of the fourth condition C4 and the fifth condition C5, determining the area as a second target area.
4. The method of controlling a refrigeration unit for a refrigerator based on carbon dioxide refrigeration according to claim 3, wherein determining the liquid carbon dioxide flow adjustment amount of the target area based on measured temperature data of the target area at a plurality of times in the i-th detection period, the set temperature of the target area, the liquid carbon dioxide flow information of the target area in the i-th detection period, and the maximum flow of the liquid carbon dioxide, comprises:
Determining a liquid carbon dioxide regulating and increasing demand range of the first target area according to conditions met by measured temperature data of the first target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the first target area in the ith detection period;
determining a liquid carbon dioxide reduction requirement range of the second target area according to conditions met by measured temperature data of the second target area in the ith detection period, the set temperature and liquid carbon dioxide flow information of the second target area in the ith detection period;
setting a liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand range of each first target area, the liquid carbon dioxide adjustment and decrease demand range of each second target area and the liquid carbon dioxide maximum flow;
and determining the liquid carbon dioxide flow adjustment amounts of the first target area and the second target area according to the liquid carbon dioxide flow optimization function.
5. The method of claim 4, wherein determining the liquid carbon dioxide increase demand range of the first target area based on conditions satisfied by measured temperature data of the first target area in an i-th detection period, the set temperature, and liquid carbon dioxide flow information of the first target area in the i-th detection period, comprises:
If the measured temperature data of the first target area in the ith detection period meets the first condition C1, the liquid carbon dioxide increase demand range of the first target area is:
wherein ,increasing the demand for liquid carbon dioxide in the first target area,/->For the i-th detection period of the first target area, liquid carbon dioxide flow information,/for the i-th detection period of the first target area>A preset coefficient greater than 1, +.>A flow rate of liquid carbon dioxide such that a temperature of the first target zone is unchanged;
if the measured temperature data of the first target area in the ith detection period meets the second condition C2, the liquid carbon dioxide increase demand range of the first target area is as follows:
wherein , and />Are all preset proportional coefficients;
if the measured temperature data of the first target area in the ith detection period meets the third condition C3, the liquid carbon dioxide increase demand range of the first target area is as follows:
wherein ,a preset coefficient greater than 1.
6. The method of claim 4, wherein determining the liquid carbon dioxide subtraction demand range of the second target area according to conditions satisfied by measured temperature data of the second target area in the i-th detection period, the set temperature, and liquid carbon dioxide flow information of the second target area in the i-th detection period, comprises:
If the measured temperature data of the second target area in the ith detection period meets the fourth condition C4, the liquid carbon dioxide reduction requirement range of the second target area is as follows:
wherein , and />Is a preset proportionality coefficient;
if the measured temperature data of the second target area in the ith detection period meets the fifth condition C5, the liquid carbon dioxide subtraction requirement range of the second target area is:
wherein ,reducing the demand for liquid carbon dioxide in the second target area,/->Is a preset proportional coefficient>In order to keep the temperature of the second target zone unchanged.
7. The method of claim 4, wherein setting a liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand range of each first target area, the liquid carbon dioxide adjustment and decrease demand range of each second target area, and the liquid carbon dioxide maximum flow, comprises:
determining constraint conditions of the liquid carbon dioxide flow optimization function according to the liquid carbon dioxide adjustment and increase demand ranges of the first target areas, the liquid carbon dioxide adjustment and decrease demand ranges of the second target areas and the maximum flow of the liquid carbon dioxide;
Minimizing the sum of the liquid carbon dioxide flow information adjusted by the first target area and the second target area as an objective function of the liquid carbon dioxide flow optimization function;
and determining the liquid carbon dioxide flow optimization function according to the constraint condition and the objective function.
8. Refrigeration house refrigerating unit control system based on carbon dioxide refrigeration, characterized by comprising:
the system comprises an actual measurement module, a control module and a control module, wherein the actual measurement module is used for respectively acquiring actual measurement temperature data of a plurality of areas in a refrigeration house at a plurality of moments in an ith detection period, wherein i is a positive integer;
the setting module is used for obtaining the set temperatures of a plurality of areas in the refrigerator;
the flow module is used for determining flow information of liquid carbon dioxide for refrigerating a plurality of areas in the refrigeration house in an ith detection period;
the screening module is used for determining a target area which needs to be adjusted on the flow information of the liquid carbon dioxide in the (i+1) th detection period according to the measured temperature data of the plurality of areas in the refrigerator and the set temperatures of the plurality of areas in the refrigerator;
the maximum flow module is used for determining the maximum flow of liquid carbon dioxide of the refrigerating unit of the refrigeration house;
The adjustment quantity module is used for determining the liquid carbon dioxide flow adjustment quantity of the target area according to the measured temperature data of the target area at a plurality of moments in the ith detection period, the set temperature of the target area, the liquid carbon dioxide flow information of the target area in the ith detection period and the maximum flow of the liquid carbon dioxide;
and the adjusting module is used for determining the liquid carbon dioxide flow information of the target area in the (i+1) th detection period according to the liquid carbon dioxide flow information of the target area in the (i) th detection period and the liquid carbon dioxide flow adjustment quantity of the target area.
CN202311064989.8A 2023-08-23 2023-08-23 Control method and system for refrigeration storage refrigerating unit based on carbon dioxide refrigeration Active CN116804496B (en)

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Publication number Priority date Publication date Assignee Title
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CN112066638A (en) * 2020-09-18 2020-12-11 汤涛 Intelligent cold-chain logistics commodity storage environment regulation and control system based on Internet of things control

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207162999U (en) * 2017-09-15 2018-03-30 北京市京科伦冷冻设备有限公司 A kind of independent humidification-type fruits and vegetables ice temperature stereo garage carbon dioxide refrigerating system
CN209806999U (en) * 2018-12-19 2019-12-20 广州极速制冷设备有限公司 Intelligent molecular preservation warehouse
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