Ice making rate control method and device for ice storage system

Abstract

The application discloses an ice-making rate control method and device for an ice storage system and belongs to the technical field of ice storage system control. The application pre-establishes a mathematical model of a heat transfer coefficient of an ice storage tank, a mathematical model of power of a refrigerant pump set and a mathematical model of power of a refrigeration unit, dynamically optimizes control parameters based on real-time data during operation, simultaneously gives adjustment instructions for refrigerant temperatures of the refrigerant pump set and the refrigeration unit according to current operation state feedback values, adjusts not only the deviation degree of the ice-making rate but also minimizes ice-making energy consumption, can significantly reduce the energy consumption of the ice-making system, improves the ice-making efficiency and stability, and is suitable for various ice storage type ice-making systems.

Description

Technical Field

[0001] This invention belongs to the technical field of ice storage systems, and specifically relates to a method and device for controlling the ice-making rate of an ice storage system. Background Technology

[0002] An ice storage system is a system that uses off-peak electricity at night to make ice and melts the ice to release its cooling capacity during peak or off-peak electricity periods. It typically consists of a refrigerant pump unit, an ice storage tank, and a refrigeration unit (such as...). Figure 1 (As shown). However, since the length of the off-peak electricity price period is fixed, once the total ice production volume is determined, the ice-making rate must be controlled at an appropriate value. If the ice-making rate is too slow, the ice production target cannot be achieved during the off-peak electricity price period; if the ice-making rate is too fast, the ice-making energy efficiency will be relatively low. Therefore, controlling the ice-making rate is very important. While controlling the ice-making rate at a reasonable value, it is also necessary to improve the operating energy efficiency of the ice-making system, which is crucial for improving the overall energy efficiency of the ice storage system.

[0003] In existing technologies, the ice-making rate is generally controlled by adjusting the refrigerant flow rate or the refrigerant temperature. While both can control the ice-making rate, countless combinations of refrigerant flow rate and temperature can achieve a given ice-making rate, but the corresponding energy efficiency of the ice-making system varies, potentially leading to high energy consumption that does not meet practical application requirements. Therefore, determining the most energy-efficient operating parameters while ensuring the ice-making rate is particularly important. Summary of the Invention

[0004] To address the above problems, in a first aspect, this invention proposes a method for controlling the ice-making rate of an ice storage system, comprising the following steps: Before starting the ice storage system, establish mathematical models for the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit. During the operation of the ice storage system, the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit are measured in real time to calculate the current ice-making rate. Based on the current ice-making rate, and according to the mathematical models of the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit, the refrigerant flow rate and the refrigerant outlet temperature of the refrigeration unit are dynamically optimized with the goal of achieving the target ice-making rate and minimizing the total power of the ice-making system.

[0005] Furthermore, establishing mathematical models for the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit before starting the ice storage system includes the following steps: By using the heat transfer coefficient of the ice-making process under different refrigerant flow rates and ice storage amounts of the refrigeration unit, a first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and ice storage amount of the refrigeration unit is obtained by fitting, and a mathematical model of the heat transfer coefficient of the ice storage tank is established based on the first functional relationship. The power of the refrigerant pump unit under different refrigerant flow rates was measured, and a second functional relationship between the power of the refrigerant pump unit and the refrigerant flow rate was obtained by fitting. A mathematical model of the power of the refrigerant pump unit was established based on the second functional relationship. The power of the refrigeration unit is measured at different condensing temperatures, refrigerant flow rates, refrigerant inlet temperatures, and refrigerant outlet temperatures. A third functional relationship between the power of the refrigeration unit and these three temperatures is fitted, and a mathematical model of the refrigeration unit power is established based on this third functional relationship.

[0006] Furthermore, the mathematical model for the heat transfer coefficient of the ice storage tank is as follows:

[0007] In the formula, The heat transfer coefficient during the ice-making process. This represents the first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and the amount of ice already stored, where... For the refrigerant flow rate of the ice maker unit, This represents the amount of ice already stored; The mathematical model for the power of the refrigerant pump unit is as follows:

[0008] In the formula, For refrigerant pump unit power, This represents the second functional relationship between the power of the refrigerant pump unit and the refrigerant flow rate of the ice maker unit. The mathematical model for the power of the refrigeration unit is as follows:

[0009] In the formula, For the power of the refrigeration unit, This is a third function relating the power of the refrigeration unit to the condensing temperature of the refrigeration unit, the refrigerant flow rate of the ice maker, the refrigerant inlet temperature of the refrigeration unit, and the refrigerant outlet temperature of the refrigeration unit. This refers to the condensing temperature of the refrigeration unit. , These are the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit, respectively.

[0010] Furthermore, the real-time measurement of the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit, and the calculation of the current ice-making rate, includes the following steps: Obtain the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit; Based on the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and specific heat of the refrigerant, the current ice-making rate is calculated using the mathematical model of the heat transfer coefficient of the ice storage tank. The formula for calculating the current ice-making rate is as follows:

[0011] In the formula, Given the current ice-making rate, This represents the current refrigerant flow rate of the refrigeration unit. For the specific heat of the refrigerant, , These are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the refrigeration unit, respectively.

[0012] Furthermore, the step of dynamically optimizing the refrigerant flow rate and refrigerant outlet temperature of the refrigeration unit based on the current ice-making rate, according to the mathematical model of the heat transfer coefficient of the ice storage tank, the mathematical model of the refrigerant pump group power, and the mathematical model of the refrigeration unit power, with the goal of minimizing the target ice-making rate and the total power of the ice-making system, includes the following steps: S1: Preset the refrigerant flow rate of the refrigeration unit, and calculate the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate using the current ice-making rate and based on the mathematical model of the heat transfer coefficient of the ice storage tank. S2: Calculate the refrigerant pump unit power under the preset refrigerant flow rate of the refrigeration unit based on the refrigerant pump unit power mathematical model; S3: Calculate the power of the ice maker under the preset refrigerant flow rate by using the refrigerant outlet temperature and refrigerant inlet temperature of the refrigeration unit at the preset refrigerant flow rate. S4: Determine the total power of the ice-making system under the preset refrigerant flow rate of the refrigeration unit based on the power of the refrigerant pump unit and the power of the ice-making unit under the preset refrigerant flow rate of the refrigeration unit; S5: Iterate through all possible values ​​of the refrigerant flow rate of the refrigeration unit, and determine the refrigerant flow rate of the refrigeration unit that minimizes the total power of the ice-making system, as well as the refrigerant outlet temperature of the refrigeration unit at this time, following the steps of S1-S4.

[0013] Furthermore, if the refrigerant pump unit has multiple states to achieve the preset refrigerant flow rate of the refrigeration unit, the operating state with the lowest refrigerant pump unit power is selected.

[0014] Furthermore, the calculation of the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate using the current ice-making rate and based on the mathematical model of the heat transfer coefficient of the ice storage tank includes the following steps: Equation 1 is constructed based on the mathematical model of the heat transfer coefficient of the ice storage tank to construct the target ice-making rate corresponding to the current ice-making rate and the preset refrigerant flow rate of the refrigeration unit. Equation 2 is constructed based on the relationship between the preset refrigerant flow rate of the refrigeration unit, the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate, the refrigerant inlet temperature of the refrigeration unit, and the target ice-making rate. Using Equations 1 and 2, a set of equations for the target ice-making rate under the preset refrigerant flow rate of the refrigeration unit is constructed, and the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate is obtained by solving the equations.

[0015] Furthermore, Equation 1 is as follows:

[0016] Equation 2 is as follows:

[0017] In the formula, , These are the preset refrigerant flow rate of the refrigeration unit and the currently measured refrigerant flow rate of the ice maker, respectively. This represents the current ice storage volume. , These are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the ice maker unit, respectively. , These are the refrigerant inlet temperature and refrigerant outlet temperature of the ice maker under the preset refrigerant flow rate of the refrigeration unit. and These are the ice-making rates under the preset refrigerant flow rate of the refrigeration unit and the ice-making rates under the current refrigerant flow rate of the ice maker unit, respectively.

[0018] Secondly, this invention proposes an ice-making rate control device for an ice storage system, comprising: The mathematical model building module is used to build mathematical models of the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit before the ice storage system is started. The ice-making rate calculation module is used to measure the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit in real time during the operation of the ice storage system, and to calculate the current ice-making rate. The ice-making rate control module, based on the current ice-making rate, and according to the mathematical models of the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit, dynamically optimizes the refrigerant flow rate and the refrigerant outlet temperature of the refrigeration unit with the goal of achieving the target ice-making rate and minimizing the total power of the ice-making system.

[0019] Furthermore, the ice-making rate calculation module calculates the current ice-making rate by obtaining the refrigerant inlet temperature, refrigerant outlet temperature, and condensing temperature of the refrigeration unit from the temperature sensor, and by obtaining the refrigerant flow rate of the refrigeration unit from the flow sensor.

[0020] Thirdly, the present invention proposes an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, which stores computer programs; The processor, when executing the program stored in the memory, implements the ice-making rate control method of the ice storage system.

[0021] Fourthly, a computer-readable storage medium storing a computer program, characterized in that, when the computer program is run, it executes the ice-making rate control method of the ice storage system.

[0022] The beneficial effects of this invention are: This invention establishes a mathematical model in advance and dynamically optimizes control parameters based on real-time data during operation. It simultaneously provides adjustment commands for the refrigerant temperature of the refrigerant pump group and the refrigeration unit based on the feedback value of the current operating status. It not only adjusts the deviation of the ice-making rate, but also considers minimizing ice-making energy consumption. This can significantly reduce the energy consumption of the ice-making system, improve ice-making efficiency and stability, and is applicable to various types of ice storage ice-making systems.

[0023] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1A structural diagram of an ice storage system in the prior art is shown; Figure 2 A flowchart of an ice storage system ice-making rate control method proposed in an embodiment of the present invention is shown; Figure 3 This invention illustrates a flowchart of dynamically optimizing refrigerant flow and refrigerant temperature during the operation of an ice storage system. Figure 4 A schematic diagram of an ice-making rate control device for an ice storage system proposed in an embodiment of the present invention is shown. Figure 5 A schematic diagram of an electronic device proposed in an embodiment of the present invention is shown. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This invention is based on the actual operating state of the ice storage system. Based on the feedback value of the operating state, it simultaneously gives the adjustment command of the outlet water temperature of the chiller unit. The flow rate of the refrigerant solution is achieved by adjusting the frequency of the refrigerant pump, and the temperature of the refrigerant solution is achieved by setting the outlet temperature of the chiller unit evaporator. It not only adjusts the deviation of the ice-making rate, but also considers minimizing the ice-making energy consumption of the ice storage system.

[0028] This invention proposes a method for controlling the ice-making rate of an ice storage system, such as... Figure 2 As shown, it includes the following steps: S1: Before starting the ice storage system, establish mathematical models for the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit, respectively. S2: During the operation of the ice storage system, the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit are measured in real time to calculate the current ice-making rate. S3: Based on the current ice-making rate, according to the mathematical model of the heat transfer coefficient of the ice storage tank, the mathematical model of the refrigerant pump group power, and the mathematical model of the refrigeration unit power, with the goal of achieving the target ice-making rate and minimizing the total power of the ice-making system, dynamically optimize the refrigerant flow rate and refrigerant outlet temperature of the refrigeration unit.

[0029] It should be noted that the above steps are divided into two parts. The first part is to build a mathematical model before starting the ice storage system, so as to facilitate the calculation and optimization of control parameters during the subsequent operation of the ice storage system. The second part is to obtain real-time operating parameters during the operation of the ice storage system and dynamically adjust them with the help of the pre-built mathematical model, so as to minimize the power of the entire ice storage system at the target ice-making rate.

[0030] For example, the mathematical model for the heat transfer coefficient of the ice storage tank is established according to the following process: 1) Under a certain refrigerant flow rate and ice storage capacity of a refrigeration unit, measure the temperature of the refrigerant entering the ice storage tank and the temperature of the refrigerant flowing out of the ice storage tank, and calculate the heat transfer coefficient of the ice-making process under the refrigerant flow rate and ice storage capacity of the refrigeration unit: (1) In the formula, The heat transfer coefficient during the ice-making process. c is the refrigerant flow rate of the ice maker; c is the specific heat of the refrigerant. and These are the temperatures at which the refrigerant enters the ice storage tank and the temperatures at which the refrigerant flows out of the ice storage tank, respectively. .

[0031] 2) Perform step 1) under multiple different refrigerant flow rates and ice storage capacities of refrigeration units; 3) Based on the data obtained in step 2), fit the first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and the amount of ice already stored in the refrigeration unit, and establish a mathematical model for the heat transfer coefficient of the ice storage tank: (2) In the formula, The heat transfer coefficient during the ice-making process. This represents the first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and the amount of ice already stored in the refrigeration unit, where... This refers to the refrigerant flow rate of the refrigeration unit. This represents the amount of ice already stored; For example, the power mathematical model of the refrigerant pump unit is established according to the following process: The power of the refrigerant pump unit under different refrigerant flow rates was measured, and a second functional relationship between the power of the refrigerant pump unit and the refrigerant flow rate of the ice maker unit was obtained by fitting the data. A mathematical model of the power of the refrigerant pump unit was then established. If the refrigerant pump unit can achieve the same refrigerant flow rate of the ice maker unit under different operating conditions, that is, the same refrigerant flow rate of the ice maker unit corresponds to multiple different power levels, then the minimum power level is taken.

[0032] (3) In the formula, For refrigerant pump unit power, This represents the second functional relationship between the power of the refrigerant pump unit and the refrigerant flow rate of the ice maker unit. This refers to the refrigerant flow rate of the refrigeration unit. For example, the power mathematical model of the refrigeration unit is established according to the following process: The power of the refrigeration unit was measured under different condensing temperatures, refrigerant flow rates, refrigerant inlet temperatures (i.e., the temperature at which the refrigerant flows out of the ice storage tank), and refrigerant outlet temperatures (i.e., the temperature at which the refrigerant enters the ice storage tank). The functional relationship between the refrigeration unit power and these three temperatures was then fitted. And establish a mathematical model of the power of the refrigeration unit.

[0033] (4) In the formula, For the power of the refrigeration unit, This is a third function relating the power of the refrigeration unit to the condensing temperature of the refrigeration unit, the refrigerant flow rate of the ice maker, the refrigerant inlet temperature of the refrigeration unit, and the refrigerant outlet temperature of the refrigeration unit. This refers to the condensing temperature of the refrigeration unit. This refers to the refrigerant flow rate of the refrigeration unit. , These are the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit, respectively.

[0034] For example, the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit are measured in real time, and the current ice-making rate is calculated, including: During operation control, the current refrigerant temperature entering the ice storage tank (i.e., the refrigerant outlet temperature of the chiller unit) and the temperature exiting the ice storage tank (i.e., the refrigerant inlet temperature of the chiller unit) are measured, along with the current refrigerant flow rate of the chiller unit. Current condensing temperature of the refrigeration unit Calculate the current ice-making rate using the following formula: (5) In the formula, Given the current ice-making rate, This represents the current refrigerant flow rate of the refrigeration unit. For the specific heat of the refrigerant, , These are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the refrigeration unit, respectively.

[0035] like Figure 3As shown, based on the current ice-making rate, and according to the mathematical models of the ice storage tank heat transfer coefficient, refrigerant pump group power, and refrigeration unit power, the dynamic optimization of the refrigerant flow rate and refrigerant outlet temperature of the refrigeration unit, with the goal of achieving the target ice-making rate and minimizing the total power of the ice-making system, includes the following steps: S31: Preset the refrigerant flow rate of the refrigeration unit, and calculate the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate using the current ice-making rate and based on the mathematical model of the heat transfer coefficient of the ice storage tank. S32: Calculate the refrigerant pump unit power under the preset refrigerant flow rate of the refrigeration unit based on the refrigerant pump unit power mathematical model; S33: Calculate the power of the ice maker under the preset refrigerant flow rate by using the refrigerant outlet temperature and refrigerant inlet temperature of the refrigeration unit at the preset refrigerant flow rate. S34: Determine the total power of the ice-making system under the preset refrigerant flow rate of the refrigeration unit based on the power of the refrigerant pump unit and the power of the ice-making unit under the preset refrigerant flow rate of the refrigeration unit; S35: Iterate through all possible values ​​of refrigerant flow rate, and determine the refrigerant flow rate of the refrigeration unit that minimizes the total power of the ice-making system, as well as the refrigerant outlet temperature of the refrigeration unit at this time, following the steps of S31-S34.

[0036] For example, the above dynamic optimization process is as follows: S311: Assuming the refrigerant flow rate of the refrigeration unit is... Calculate how to achieve the target ice-making rate under these conditions. The refrigerant outlet temperature of the refrigeration unit The method is as follows: Equation 1 (Equation 6) is constructed based on the mathematical model of the heat transfer coefficient of the ice storage tank to construct the target ice-making rate corresponding to the current ice-making rate and the preset refrigerant flow rate of the refrigeration unit. Equation 2 (Equation 7) is constructed based on the relationship between the preset refrigerant flow rate of the refrigeration unit, the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate, the refrigerant inlet temperature of the refrigeration unit, and the target ice-making rate. Solving the system of equations shown in equations (6) and (7), we obtain... and This refers to the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit.

[0037] (6) (7) In the formula, , These are the preset refrigerant flow rate of the refrigeration unit and the currently measured refrigerant flow rate of the ice maker, respectively. This represents the current ice storage volume. , These are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the ice maker unit, respectively. , These are the refrigerant inlet temperature and refrigerant outlet temperature of the ice maker under the preset refrigerant flow rate of the refrigeration unit. and These are the ice-making rates under the preset refrigerant flow rate of the refrigeration unit and the ice-making rates under the current refrigerant flow rate of the refrigeration unit, respectively.

[0038] S312: Calculate the refrigerant flow rate of the refrigerant pump unit at the preset refrigerant flow rate of the refrigeration unit according to formula (3). Power below ; S313: Calculate the refrigerant flow rate of the preset refrigeration unit according to formula (4). Refrigeration unit condensing temperature Refrigeration unit refrigerant inlet temperature and refrigerant outlet temperature of refrigeration unit The power of the refrigeration unit below ; S314: Calculate the total power of the ice-making system using the following formula;

[0039] In the formula, This refers to the total power of the ice-making system. For the power of the refrigeration unit, This refers to the power of the refrigerant pump unit.

[0040] S315: Iterate through all possible values ​​of the refrigerant flow rate, repeating S311~S314, to find the refrigerant flow rate that minimizes the total power of the ice-making system. And record the refrigerant outlet temperature of the refrigeration unit at this time. .

[0041] Issue a command to control the refrigerant flow of the refrigeration unit at... Control the refrigerant outlet temperature of the refrigeration unit at If the refrigerant pump unit can achieve the required refrigerant flow rate for the refrigeration unit under multiple different operating conditions... Then, the state that minimizes the power of the refrigerant pump unit is selected, and the cycle S311-S315 is executed repeatedly.

[0042] Based on the above method embodiments, this embodiment proposes an ice-making rate control device for an ice storage system, such as... Figure 4 As shown, it includes: The mathematical model building module is used to build mathematical models of the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit before the ice storage system is started. The ice-making rate calculation module is used to measure the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit in real time during the operation of the ice storage system, and to calculate the current ice-making rate. The ice-making rate control module, based on the current ice-making rate, and according to the mathematical models of the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit, dynamically optimizes the refrigerant flow rate and the refrigerant outlet temperature of the refrigeration unit with the goal of achieving the target ice-making rate and minimizing the total power of the ice-making system.

[0043] Another exemplary embodiment of the present invention provides an electronic device. For example... Figure 5 As shown, the electronic device includes at least one processor 501, at least one communication interface 502, at least one memory 503, and at least one communication bus 504; wherein the processor 501, communication interface 502, and memory 503 communicate with each other through the communication bus 504. Memory 503 stores computer programs; The processor 501 is used to execute the program stored in the memory 503 to implement the ice-making rate control method of the ice storage system.

[0044] Optionally, the communication interface can be an interface of a communication module, such as the interface of a GSM module; the processor may be a CPU, an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The memory may include high-speed RAM and may also include non-volatile memory, such as at least one disk storage device. The memory stores a program, and the processor calls the program stored in the memory to execute some or all of the above-described method embodiments.

[0045] Based on the same inventive concept, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed, implements some or all of the above-described method embodiments. Optionally, the storage medium may be a non-transitory computer-readable storage medium, such as a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage battery device, etc.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the ice-making rate of an ice storage system, characterized in that, Includes the following steps: Before starting the ice storage system, establish mathematical models for the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit. During the operation of the ice storage system, the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit are measured in real time to calculate the current ice-making rate. Based on the current ice-making rate, and according to the mathematical model of the heat transfer coefficient of the ice storage tank, the mathematical model of the power of the refrigerant pump group, and the mathematical model of the power of the refrigeration unit, with the goal of achieving the target ice-making rate and minimizing the total power of the ice-making system, the refrigerant flow rate of the refrigeration unit and the refrigerant outlet temperature of the refrigeration unit are dynamically optimized. The process of establishing mathematical models for the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit before starting the ice storage system includes the following steps: By using the heat transfer coefficient of the ice-making process under different refrigerant flow rates and ice storage amounts of the refrigeration unit, a first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and ice storage amount of the refrigeration unit is obtained by fitting, and a mathematical model of the heat transfer coefficient of the ice storage tank is established based on the first functional relationship. The power of the refrigerant pump unit under different refrigerant flow rates was measured, and a second functional relationship between the power of the refrigerant pump unit and the refrigerant flow rate was obtained by fitting. A mathematical model of the power of the refrigerant pump unit was established based on the second functional relationship. The power of the refrigeration unit is measured at different condensing temperatures, refrigerant flow rates, refrigerant inlet temperatures, and refrigerant outlet temperatures. A third functional relationship between the power of the refrigeration unit and these three temperatures is fitted, and a mathematical model of the refrigeration unit power is established based on this third functional relationship.

2. The ice-making rate control method for an ice storage system according to claim 1, characterized in that, The mathematical model for the heat transfer coefficient of the ice storage tank is as follows: In the formula, The heat transfer coefficient during the ice-making process. This represents the first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and the amount of ice already stored, where... For the refrigerant flow rate of the ice maker unit, This represents the amount of ice already stored; The mathematical model for the power of the refrigerant pump unit is as follows: In the formula, For refrigerant pump unit power, This represents the second functional relationship between the power of the refrigerant pump unit and the refrigerant flow rate of the ice maker unit. The mathematical model for the power of the refrigeration unit is as follows: In the formula, For the power of the refrigeration unit, This is a third function relating the power of the refrigeration unit to the condensing temperature of the refrigeration unit, the refrigerant flow rate of the ice maker, the refrigerant inlet temperature of the refrigeration unit, and the refrigerant outlet temperature of the refrigeration unit. This refers to the condensing temperature of the refrigeration unit. , These are the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit, respectively.

3. The ice-making rate control method for an ice storage system according to claim 1, characterized in that, The real-time measurement of the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit, and the calculation of the current ice-making rate, includes the following steps: Obtain the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit; Based on the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and specific heat of the refrigerant, the current ice-making rate is calculated using the mathematical model of the heat transfer coefficient of the ice storage tank. The formula for calculating the current ice-making rate is as follows: In the formula, Given the current ice-making rate, This represents the current refrigerant flow rate of the refrigeration unit. For the specific heat of the refrigerant, , These are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the refrigeration unit, respectively.

4. The ice-making rate control method for an ice storage system according to claim 1, characterized in that, The process of dynamically optimizing the refrigerant flow rate and refrigerant outlet temperature of the refrigeration unit based on the current ice-making rate, according to the mathematical models of the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit, with the goal of minimizing the target ice-making rate and the total power of the ice-making system, includes the following steps: S1: Preset the refrigerant flow rate of the refrigeration unit, and calculate the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate using the current ice-making rate and based on the mathematical model of the heat transfer coefficient of the ice storage tank. S2: Calculate the refrigerant pump unit power under the preset refrigerant flow rate of the refrigeration unit based on the refrigerant pump unit power mathematical model; S3: Calculate the power of the ice maker under the preset refrigerant flow rate by using the refrigerant outlet temperature and refrigerant inlet temperature of the refrigeration unit at the preset refrigerant flow rate. S4: Determine the total power of the ice-making system under the preset refrigerant flow rate of the refrigeration unit based on the power of the refrigerant pump unit and the power of the ice-making unit under the preset refrigerant flow rate of the refrigeration unit; S5: Iterate through all possible values ​​of the refrigerant flow rate of the refrigeration unit, and determine the refrigerant flow rate of the refrigeration unit that minimizes the total power of the ice-making system, as well as the refrigerant outlet temperature of the refrigeration unit at this time, following the steps of S1-S4.

5. The ice-making rate control method for an ice storage system according to claim 4, characterized in that, If the refrigerant pump unit has multiple states to achieve the preset refrigerant flow rate of the refrigeration unit, select the operating state with the lowest refrigerant pump unit power.

6. The ice-making rate control method for an ice storage system according to claim 4, characterized in that, The calculation of the refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate using the current ice-making rate and based on the mathematical model of the heat transfer coefficient of the ice storage tank includes the following steps: Equation 1 is constructed based on the mathematical model of the heat transfer coefficient of the ice storage tank to construct the target ice-making rate corresponding to the current ice-making rate and the preset refrigerant flow rate of the refrigeration unit. Equation 2 is constructed based on the relationship between the preset refrigerant flow rate of the refrigeration unit, the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate, the refrigerant inlet temperature of the refrigeration unit, and the target ice-making rate. Using Equations 1 and 2, a set of equations for the target ice-making rate under the preset refrigerant flow rate of the refrigeration unit is constructed, and the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate is obtained by solving the equations.

7. The ice-making rate control method for an ice storage system according to claim 6, characterized in that, Equation 1 is as follows: Equation 2 is as follows: In the formula, , These are the preset refrigerant flow rate of the refrigeration unit and the currently measured refrigerant flow rate of the ice maker, respectively. This represents the current ice storage volume. , These are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the ice maker unit, respectively. , These are the refrigerant inlet temperature and refrigerant outlet temperature of the ice maker under the preset refrigerant flow rate of the refrigeration unit. and These are the ice-making rates under the preset refrigerant flow rate of the refrigeration unit and the ice-making rates under the current refrigerant flow rate of the ice maker unit, respectively.

8. A device for controlling the ice-making rate of an ice storage system, characterized in that, include: The mathematical model building module is used to build mathematical models of the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit before the ice storage system is started. The ice-making rate calculation module is used to measure the current refrigerant inlet temperature, refrigerant outlet temperature, refrigerant flow rate, and condensing temperature of the refrigeration unit in real time during the operation of the ice storage system, and to calculate the current ice-making rate. The ice-making rate control module, based on the current ice-making rate, dynamically optimizes the refrigerant flow rate and refrigerant outlet temperature of the refrigeration unit according to the mathematical model of the heat transfer coefficient of the ice storage tank, the mathematical model of the refrigerant pump group power, and the mathematical model of the refrigeration unit power, with the goal of achieving the target ice-making rate and minimizing the total power of the ice-making system. The process of establishing mathematical models for the heat transfer coefficient of the ice storage tank, the power of the refrigerant pump group, and the power of the refrigeration unit before starting the ice storage system includes the following steps: By using the heat transfer coefficient of the ice-making process under different refrigerant flow rates and ice storage amounts of the refrigeration unit, a first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and ice storage amount of the refrigeration unit is obtained by fitting, and a mathematical model of the heat transfer coefficient of the ice storage tank is established based on the first functional relationship. The power of the refrigerant pump unit under different refrigerant flow rates was measured, and a second functional relationship between the power of the refrigerant pump unit and the refrigerant flow rate was obtained by fitting. A mathematical model of the power of the refrigerant pump unit was established based on the second functional relationship. The power of the refrigeration unit is measured at different condensing temperatures, refrigerant flow rates, refrigerant inlet temperatures, and refrigerant outlet temperatures. A third functional relationship between the power of the refrigeration unit and these three temperatures is fitted, and a mathematical model of the refrigeration unit power is established based on this third functional relationship.

9. The ice-making rate control device for an ice storage system according to claim 8, characterized in that, The ice-making rate calculation module calculates the current ice-making rate by obtaining the refrigerant inlet temperature, refrigerant outlet temperature, and condensing temperature of the refrigeration unit from the temperature sensor, and the refrigerant flow rate of the refrigeration unit from the flow sensor.

10. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, which stores computer programs; A processor, when executing a program stored in a memory, implements the ice-making rate control method of the ice storage system according to any one of claims 1-7.

11. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is run, it executes the ice-making rate control method for the ice storage system as described in any one of claims 1-7.

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