Ice-making rate control method and device for ice storage system

Abstract

The invention 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. According to the method, an ice storage tank heat transfer coefficient mathematical model, a refrigerant pump set power mathematical model and a refrigerating unit power mathematical model are established in advance, control parameters are dynamically optimized based on real-time data during operation, and refrigerant temperature adjusting instructions of a refrigerant pump set and a refrigerating unit are given out at the same time according to a current operation state feedback value; the ice-making speed deviation degree is adjusted, the ice-making energy consumption is minimum, the energy consumption of the ice-making system can be remarkably reduced, the ice-making efficiency and stability are improved, and the ice-making speed deviation degree adjusting device is suitable for various ice storage type ice-making systems.

Description

Technical Field

[0001] The present invention belongs to the technical field of ice storage systems, and in particular relates to an ice making rate control method and device for an ice storage system. Background Art

[0002] Ice storage system is a system that uses low-peak electricity at night to make ice and melts ice to release cooling energy during peak or flat electricity price periods. It is generally composed of a refrigerant pump group, an ice storage tank and a refrigeration unit (such as Figure 1 (as shown). However, since the duration of the electricity price off-peak period is fixed, once the total ice production capacity is determined, the ice-making rate must be controlled at an appropriate value. If the ice-making rate is too slow, the ice-making target cannot be achieved during the electricity price off-peak 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 an appropriate value, it is also necessary to improve the energy efficiency of the ice-making system. This 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. Although adjusting either refrigerant flow rate or temperature can control the ice-making rate, there are countless combinations of refrigerant flow rates and temperatures that can achieve a given ice-making rate. However, the energy efficiency of the corresponding ice-making systems varies, potentially resulting in high energy consumption and not meeting actual application requirements. Therefore, it is particularly important to determine the operating parameters that maximize energy efficiency while ensuring the ice-making rate. Summary of the Invention

[0004] In response to the above problems, in a first aspect, the present invention proposes a method for controlling ice making rate of an ice storage system, comprising the following steps: Before the ice storage system is started, the mathematical models of heat transfer coefficient of ice storage tank, power of refrigerant pump group and power of refrigeration unit are established respectively; During the operation of the ice storage system, the current refrigeration unit refrigerant inlet temperature, refrigeration unit refrigerant outlet temperature, refrigeration unit refrigerant flow rate and refrigeration unit condensing temperature are measured in real time to calculate the current ice making rate; 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 power of the refrigerant pump group and the mathematical model of the power of the refrigeration unit, the refrigerant flow rate of the refrigeration unit 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, before the ice storage system is started, the method of establishing a heat transfer coefficient mathematical model of the ice storage tank, a power mathematical model of the refrigerant pump group, and a power mathematical model of the refrigeration unit respectively includes the following steps: Using the heat transfer coefficient of the ice-making process under different refrigeration unit refrigerant flow rates and ice storage capacities, a first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and ice storage capacity of the refrigeration unit is fitted, and a mathematical model of the heat transfer coefficient of the ice storage tank is established based on the first functional relationship; Measuring the pump group power of the refrigerant pump group at different refrigerant flow rates, and fitting a second functional relationship between the refrigerant pump group power and the refrigerant flow rate, and establishing a refrigerant pump group power mathematical model based on the second functional relationship; The power of the refrigeration unit is measured at different refrigeration unit condensing temperatures, refrigeration unit refrigerant flow rates, refrigeration unit refrigerant inlet temperatures and refrigeration unit refrigerant outlet temperatures, and a third functional relationship between the refrigeration unit power and the refrigeration unit condensing temperature, refrigeration unit refrigerant flow rates, refrigeration unit refrigerant inlet temperatures and refrigeration unit refrigerant outlet temperatures is fitted, and a mathematical model of the refrigeration unit power is established based on the third functional relationship.

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

[0007] Where, is the heat transfer coefficient of the ice making process, is the first functional relationship between the heat transfer coefficient of the ice making process and the refrigerant flow rate and the amount of ice stored, where: is the refrigerant flow rate of the ice making unit, The amount of ice stored; The mathematical model of the refrigerant pump group power is as follows:

[0008] Where, is the power of the refrigerant pump group, is the second functional relationship between the power of the refrigerant pump group and the refrigerant flow rate of the ice making unit; The mathematical model of the refrigeration unit power is as follows:

[0009] Where, is the power of the refrigeration unit, is the third function relationship between the refrigeration unit power and the condensing temperature of the refrigeration unit, the refrigerant flow of the ice making unit, the refrigerant inlet temperature of the refrigeration unit, and the refrigerant outlet temperature of the refrigeration unit, where: is the condensing temperature of the refrigeration unit, 、 They are the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigeration unit respectively.

[0010] Furthermore, the real-time measurement of the current refrigeration unit refrigerant inlet temperature, refrigeration unit refrigerant outlet temperature, refrigeration unit refrigerant flow rate and refrigeration unit condensing temperature, and calculation of the current ice making rate includes the following steps: Get the current refrigeration unit refrigerant inlet temperature, refrigeration unit refrigerant outlet temperature, refrigeration unit refrigerant flow rate and refrigeration unit condensing temperature; Based on the current refrigerant inlet temperature of the refrigeration unit, the refrigerant outlet temperature of the refrigeration unit, the refrigerant flow rate of the refrigeration unit, and the 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 calculation formula of the current ice making rate is as follows:

[0011] Where, is the current ice making rate, is the current refrigerant flow rate of the refrigeration unit, is the specific heat of the refrigerant, 、 They are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the refrigeration unit respectively.

[0012] Furthermore, 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 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 dynamic optimization of the refrigerant flow rate of the refrigeration unit and the refrigerant outlet temperature of the refrigeration unit includes the following steps: S1: Preset the refrigerant flow rate of the refrigeration unit, use the current ice making rate and the mathematical model of the heat transfer coefficient of the ice storage tank to calculate the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate of the refrigeration unit; S2: Calculating the refrigerant pump group power at a preset refrigeration unit refrigerant flow rate based on the refrigerant pump group power mathematical model; S3: using the refrigerant outlet temperature and the refrigerant inlet temperature of the refrigeration unit at the preset refrigerant flow rate of the refrigeration unit, and calculating the ice-making unit power at the preset refrigerant flow rate of the refrigeration unit based on the refrigeration unit power mathematical model; S4: determining the total power of the ice-making system under the preset refrigerant flow rate of the refrigeration unit according to the refrigerant pump unit power and the ice-making unit power under the preset refrigerant flow rate of the refrigeration unit; S5: Traverse 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 and the refrigerant outlet temperature of the refrigeration unit at this time according to steps S1-S4.

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

[0014] Furthermore, the method of calculating the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigeration unit at a preset refrigerant flow rate of the refrigeration unit using the current ice making rate and based on the heat transfer coefficient mathematical model of the ice storage tank includes the following steps: Based on the mathematical model of the heat transfer coefficient of the ice storage tank, the equation 1 of the target ice making rate corresponding to the current ice making rate and the preset refrigerant flow rate of the refrigeration unit is constructed; 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 of the refrigeration unit, the refrigerant inlet temperature of the refrigeration unit and the target ice making rate; The target ice-making rate equation group under the preset refrigerant flow rate of the refrigeration unit is constructed by using equations 1 and 2, and the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate of the refrigeration unit is obtained by solving the equations.

[0015] Furthermore, equation 1 is as follows:

[0016] The equation 2 is as follows:

[0017] Where, 、 They are respectively the preset refrigeration unit refrigerant flow rate and the currently measured ice-making unit refrigerant flow rate. is the current ice storage capacity, 、 They are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the ice making unit, 、 They are the refrigerant inlet temperature and the refrigerant outlet temperature of the ice making unit under the preset refrigerant flow rate of the refrigeration unit, and They are respectively the ice making rate under the preset refrigerant flow rate of the refrigeration unit and the ice making rate under the current refrigerant flow rate of the ice making unit.

[0018] In a second aspect, the present invention provides an ice making rate control device for an ice storage system, comprising: A mathematical model building module is used to build a mathematical model of the heat transfer coefficient of the ice storage tank, a mathematical model of the power of the refrigerant pump group, and a mathematical model of 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 calculate the current ice making rate; The ice making rate control module dynamically optimizes the refrigerant flow rate and the refrigerant outlet temperature of the refrigeration unit based on the current ice making rate, the heat transfer coefficient mathematical model of the ice storage tank, the power mathematical model of the refrigerant pump group, and the power mathematical model 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 condensation temperature of the refrigeration unit through the temperature sensor and obtaining the refrigerant flow of the refrigeration unit through the flow sensor.

[0020] In a third aspect, the present invention provides an electronic device comprising a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus; a memory storing a computer program; The processor is configured to implement the ice making rate control method of the ice storage system when executing the program stored in the memory.

[0021] In a fourth aspect, a computer-readable storage medium stores a computer program, wherein when the computer program is run, the ice making rate control method of the ice storage system is executed.

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

[0023] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1The structure diagram of the ice storage system in the prior art is shown; Figure 2 A flow chart of an ice making rate control method for an ice storage system proposed in an embodiment of the present invention is shown; Figure 3 A flow chart showing dynamic optimization of refrigerant flow and refrigerant temperature during operation of an ice storage system according to an embodiment of the present invention is shown; 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 DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] The present invention is based on the actual operating status of the ice storage system. According to the feedback value of the operating status, an adjustment instruction for the outlet water temperature of the refrigeration unit is given at the same time. 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 evaporator of the refrigeration unit. Not only is the deviation of the ice-making rate adjusted, but also the ice-making energy consumption of the ice storage system is minimized.

[0028] The present invention proposes a method for controlling ice making rate of ice storage system, such as Figure 2 As shown, the following steps are included: S1: Before the ice storage system is started, a mathematical model of the heat transfer coefficient of the ice storage tank, a mathematical model of the power of the refrigerant pump group, and a mathematical model of the power of the refrigeration unit are established 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 power of the refrigerant pump group, and the mathematical model of the power of the refrigeration unit, the refrigerant flow rate of the refrigeration unit 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.

[0029] It should be noted that the above steps are divided into two parts. The first part is to construct the mathematical model before the ice storage system is started, which is convenient for the calculation and optimization adjustment of the control parameters during the subsequent operation of the ice storage system. The second part is to obtain the real-time working parameters during the operation of the ice storage system and dynamically adjust them with the help of the mathematical model constructed in advance, so that the power of the entire ice storage system is minimized when the target ice-making rate is achieved.

[0030] For example, the heat transfer coefficient mathematical model of the ice storage tank is established according to the following process: 1) Under certain conditions of 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 these conditions: (1) Where, is the heat transfer coefficient of the ice making process, is the refrigerant flow rate of the ice making unit; c is the specific heat of the refrigerant, and They are the temperature of the refrigerant entering the ice storage tank and the temperature of the refrigerant flowing out of the ice storage tank respectively; .

[0031] 2) Perform step 1) under different refrigerant flow rates and ice storage capacities of various refrigeration units; 3) Based on the data obtained in step 2), the first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and ice storage capacity of the refrigeration unit is obtained by fitting, and a mathematical model of the heat transfer coefficient of the ice storage tank is established: (2) Where, is the heat transfer coefficient of the ice making process, is the first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and ice storage capacity of the refrigeration unit, where: is the refrigerant flow rate of the refrigeration unit, The amount of ice stored; Exemplarily, the refrigerant pump group power mathematical model is established according to the following process: The refrigerant pump group power was measured at different refrigerant flow rates, and a second functional relationship between the refrigerant pump group power and the ice-making unit refrigerant flow rate was fitted. A mathematical model for the refrigerant pump group power was then established. If the refrigerant pump group can achieve the same ice-making unit refrigerant flow rate under different operating conditions, that is, if the same ice-making unit refrigerant flow rate corresponds to multiple different power levels, the minimum power level was used.

[0032] (3) Where, is the power of the refrigerant pump group, is the second functional relationship between the refrigerant pump unit power and the refrigerant flow rate of the ice making unit, is the refrigerant flow rate of the refrigeration unit; Exemplarily, the refrigeration unit power mathematical model is established according to the following process: Measure the power of the refrigeration unit 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). Fit the functional relationship between the power of the refrigeration unit and the condensing temperature, refrigerant flow rates, refrigerant inlet temperatures, and refrigerant outlet temperatures of the refrigeration unit. , and establish a mathematical model of refrigeration unit power.

[0033] (4) Where, is the power of the refrigeration unit, is the third function relationship between the refrigeration unit power and the condensing temperature of the refrigeration unit, the refrigerant flow of the ice making unit, the refrigerant inlet temperature of the refrigeration unit, and the refrigerant outlet temperature of the refrigeration unit, where: is the condensing temperature of the refrigeration unit, is the refrigerant flow rate of the refrigeration unit, 、 They are the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigeration unit respectively.

[0034] For example, the current refrigeration unit refrigerant inlet temperature, refrigeration unit refrigerant outlet temperature, refrigeration unit refrigerant flow rate, and refrigeration unit condensing temperature are measured in real time to calculate the current ice making rate, including: During the operation control process, the current temperature of the refrigerant entering the ice storage tank (i.e. the refrigerant outlet temperature of the refrigeration unit) and the temperature of the refrigerant flowing out of the ice storage tank (i.e. the refrigerant inlet temperature of the refrigeration unit) are measured. , current condensing temperature of the refrigeration unit , calculate the current ice making rate according to the following formula: (5) Where, is the current ice making rate, is the current refrigerant flow rate of the refrigeration unit, is the specific heat of the refrigerant, 、 They 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, 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 dynamic optimization of the refrigerant flow rate of the refrigeration unit and the refrigerant outlet temperature of the refrigeration unit includes the following steps: S31: Preset the refrigerant flow rate of the refrigeration unit, and calculate the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate of the refrigeration unit based on the current ice making rate and the mathematical model of the heat transfer coefficient of the ice storage tank; S32: Calculating the refrigerant pump group power at a preset refrigeration unit refrigerant flow rate based on the refrigerant pump group power mathematical model; S33: Calculating the ice-making unit power at the preset refrigeration unit refrigerant flow rate using the refrigeration unit refrigerant outlet temperature and the refrigeration unit refrigerant inlet temperature at the preset refrigeration unit refrigerant flow rate and based on the refrigeration unit power mathematical model; S34: Determine the total power of the ice-making system at the preset refrigerant flow rate of the refrigeration unit according to the refrigerant pump unit power and the ice-making unit power at the preset refrigerant flow rate of the refrigeration unit; S35: Traverse all possible values ​​of the refrigerant flow rate, and determine the refrigerant flow rate of the refrigeration unit that minimizes the total power of the ice-making system and the refrigerant outlet temperature of the refrigeration unit at this time according to steps S31-S34.

[0036] Exemplarily, the above dynamic optimization process is as follows: S311: Assume that the refrigerant flow rate of the refrigeration unit is Calculate the ice making rate to reach the target rate under this condition The refrigerant outlet temperature of the refrigeration unit , as follows: Based on the mathematical model of the heat transfer coefficient of the ice storage tank, the equation 1 (Equation 6) for the target ice making rate corresponding to the current ice making rate and the preset refrigerant flow rate of the refrigeration unit is constructed; Equation 2 (Equation 7) is constructed based on the relationship between the preset refrigeration unit refrigerant flow rate, the refrigeration unit refrigerant outlet temperature under the preset refrigeration unit refrigerant flow rate, the refrigeration unit refrigerant inlet temperature and the target ice making rate; Solving the equations shown in Equations (6) and (7), we obtain and That is the required refrigerant inlet temperature and refrigerant outlet temperature of the refrigeration unit.

[0037] (6) (7) Where, 、 They are respectively the preset refrigeration unit refrigerant flow rate and the currently measured ice-making unit refrigerant flow rate. is the current ice storage capacity, 、 They are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the ice making unit, 、 They are the refrigerant inlet temperature and the refrigerant outlet temperature of the ice making unit under the preset refrigerant flow rate of the refrigeration unit, and They are respectively the ice making rate under the preset refrigerant flow rate of the refrigeration unit and the ice making rate under the refrigerant flow rate of the current refrigeration unit.

[0038] S312: Calculate the refrigerant flow rate of the refrigerant pump group in the preset refrigeration unit according to formula (3) Power under ; 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 the refrigerant outlet temperature of the refrigeration unit Refrigeration unit power ; S314: Calculate the total power of the ice making system according to the following formula;

[0039] Where, is the total power of the ice making system; is the power of the refrigeration unit, is the power of the refrigerant pump group.

[0040] S315: Traverse all possible values ​​of the refrigerant flow rate, repeat S311 to S314, and 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 to , control the refrigerant outlet temperature of the refrigeration unit at If the refrigerant pump group can make the refrigerant flow of the refrigeration unit reach , then the state that minimizes the power of the refrigerant pump group is taken, and the cycle S311-S315 is executed in a cycle.

[0042] Based on the above method embodiment, this embodiment proposes an ice making rate control device for an ice storage system, such as Figure 4 Shown, including: A mathematical model building module is used to build a mathematical model of the heat transfer coefficient of the ice storage tank, a mathematical model of the power of the refrigerant pump group, and a mathematical model of 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 calculate the current ice making rate; The ice making rate control module dynamically optimizes the refrigerant flow rate and the refrigerant outlet temperature of the refrigeration unit based on the current ice making rate, the heat transfer coefficient mathematical model of the ice storage tank, the power mathematical model of the refrigerant pump group, and the power mathematical model 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. 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, the communication interface 502 and the memory 503 communicate with each other via the communication bus 504; Memory 503, storing computer programs; The processor 501 is configured to implement the ice making rate control method of the ice storage system when executing the program stored in the memory 503.

[0044] Optionally, the communication interface may be an interface of a communication module, such as an interface of a GSM module; the processor may be a CPU, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of the present invention. The memory may include high-speed RAM memory, 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 the present application further provide a computer-readable storage medium storing a computer program. When the computer program is executed, the computer program 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, or optical data storage battery device.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements 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 ice making rate of an ice storage system, characterized in that: The following steps are involved: Before the ice storage system is started, the mathematical models of heat transfer coefficient of ice storage tank, power of refrigerant pump group and power of refrigeration unit are established respectively; During the operation of the ice storage system, the current refrigeration unit refrigerant inlet temperature, refrigeration unit refrigerant outlet temperature, refrigeration unit refrigerant flow rate and refrigeration unit condensing temperature are measured in real time to calculate the current ice making rate; 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 power of the refrigerant pump group and the mathematical model of the power of the refrigeration unit, the refrigerant flow rate of the refrigeration unit 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.

2. The ice making rate control method of the ice storage system according to claim 1, characterized in that: The method of establishing a heat transfer coefficient mathematical model of the ice storage tank, a power mathematical model of the refrigerant pump group, and a power mathematical model of the refrigeration unit before starting the ice storage system comprises the following steps: Using the heat transfer coefficient of the ice-making process under different refrigeration unit refrigerant flow rates and ice storage capacities, a first functional relationship between the heat transfer coefficient of the ice-making process and the refrigerant flow rate and ice storage capacity of the refrigeration unit is fitted, and a mathematical model of the heat transfer coefficient of the ice storage tank is established based on the first functional relationship; Measuring the pump group power of the refrigerant pump group at different refrigerant flow rates, and fitting a second functional relationship between the refrigerant pump group power and the refrigerant flow rate, and establishing a refrigerant pump group power mathematical model based on the second functional relationship; The power of the refrigeration unit is measured at different refrigeration unit condensing temperatures, refrigeration unit refrigerant flow rates, refrigeration unit refrigerant inlet temperatures and refrigeration unit refrigerant outlet temperatures, and a third functional relationship between the refrigeration unit power and the refrigeration unit condensing temperature, refrigeration unit refrigerant flow rates, refrigeration unit refrigerant inlet temperatures and refrigeration unit refrigerant outlet temperatures is fitted, and a mathematical model of the refrigeration unit power is established based on the third functional relationship.

3. The ice making rate control method of the ice storage system according to claim 1 or 2, characterized in that: The mathematical model of the heat transfer coefficient of the ice storage tank is as follows: Where, is the heat transfer coefficient of the ice making process, is the first functional relationship between the heat transfer coefficient of the ice making process and the refrigerant flow rate and the amount of ice stored, where: is the refrigerant flow rate of the ice making unit, The amount of ice stored; The mathematical model of the refrigerant pump group power is as follows: Where, is the power of the refrigerant pump group, is the second functional relationship between the power of the refrigerant pump group and the refrigerant flow rate of the ice making unit; The mathematical model of the refrigeration unit power is as follows: Where, is the power of the refrigeration unit, is the third function relationship between the refrigeration unit power and the condensing temperature of the refrigeration unit, the refrigerant flow of the ice making unit, the refrigerant inlet temperature of the refrigeration unit, and the refrigerant outlet temperature of the refrigeration unit, where: is the condensing temperature of the refrigeration unit, 、 They are the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigeration unit respectively.

4. The ice making rate control method of the 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 calculation of the current ice making rate includes the following steps: Get the current refrigeration unit refrigerant inlet temperature, refrigeration unit refrigerant outlet temperature, refrigeration unit refrigerant flow rate and refrigeration unit condensing temperature; Based on the current refrigerant inlet temperature of the refrigeration unit, the refrigerant outlet temperature of the refrigeration unit, the refrigerant flow rate of the refrigeration unit, and the 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 calculation formula of the current ice making rate is as follows: Where, is the current ice making rate, is the current refrigerant flow rate of the refrigeration unit, is the specific heat of the refrigerant, 、 They are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the refrigeration unit respectively.

5. The ice making rate control method of the ice storage system according to claim 1, characterized in that: The method of dynamically optimizing the refrigerant flow rate and the refrigerant outlet temperature of the refrigeration unit based on the current ice making rate, the heat transfer coefficient mathematical model of the ice storage tank, the refrigerant pump group power mathematical model, and the refrigeration unit power mathematical model with the goal of achieving the target ice making rate and minimizing the total power of the ice making system comprises the following steps: S1: Preset the refrigerant flow rate of the refrigeration unit, use the current ice making rate and the mathematical model of the heat transfer coefficient of the ice storage tank to calculate the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate of the refrigeration unit; S2: Calculating the refrigerant pump group power at a preset refrigeration unit refrigerant flow rate based on the refrigerant pump group power mathematical model; S3: using the refrigerant outlet temperature and the refrigerant inlet temperature of the refrigeration unit at the preset refrigerant flow rate of the refrigeration unit, and calculating the ice-making unit power at the preset refrigerant flow rate of the refrigeration unit based on the refrigeration unit power mathematical model; S4: determining the total power of the ice-making system under the preset refrigerant flow rate of the refrigeration unit according to the refrigerant pump unit power and the ice-making unit power under the preset refrigerant flow rate of the refrigeration unit; S5: Traverse 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 and the refrigerant outlet temperature of the refrigeration unit at this time according to steps S1-S4.

6. The ice making rate control method of the ice storage system according to claim 5, characterized in that: If the refrigerant pump group has multiple states to achieve the preset refrigerant flow of the refrigeration unit, the operating state with the minimum power of the refrigerant pump group is selected.

7. The ice making rate control method of the ice storage system according to claim 5, characterized in that: The method of calculating the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigeration unit at a preset refrigerant flow rate of the refrigeration unit by using the current ice making rate and based on the heat transfer coefficient mathematical model of the ice storage tank comprises the following steps: Based on the mathematical model of the heat transfer coefficient of the ice storage tank, the equation 1 of the target ice making rate corresponding to the current ice making rate and the preset refrigerant flow rate of the refrigeration unit is constructed; 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 of the refrigeration unit, the refrigerant inlet temperature of the refrigeration unit and the target ice making rate; The target ice-making rate equation group under the preset refrigerant flow rate of the refrigeration unit is constructed by using equations 1 and 2, and the refrigerant outlet temperature of the refrigeration unit under the preset refrigerant flow rate of the refrigeration unit is obtained by solving the equations.

8. The ice making rate control method of the ice storage system according to claim 7, characterized in that: The equation 1 is as follows: The second equation is as follows: Where, 、 They are respectively the preset refrigeration unit refrigerant flow rate and the currently measured ice-making unit refrigerant flow rate. is the current ice storage capacity, 、 They are the current refrigerant inlet temperature and the current refrigerant outlet temperature of the ice making unit, 、 They are the refrigerant inlet temperature and the refrigerant outlet temperature of the ice making unit under the preset refrigerant flow rate of the refrigeration unit, and They are respectively the ice making rate under the preset refrigerant flow rate of the refrigeration unit and the ice making rate under the current refrigerant flow rate of the ice making unit.

9. An ice making rate control device for an ice storage system, characterized in that: include: A mathematical model building module is used to build a mathematical model of the heat transfer coefficient of the ice storage tank, a mathematical model of the power of the refrigerant pump group, and a mathematical model of 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 calculate the current ice making rate; The ice making rate control module dynamically optimizes the refrigerant flow rate and the refrigerant outlet temperature of the refrigeration unit based on the current ice making rate, the heat transfer coefficient mathematical model of the ice storage tank, the power mathematical model of the refrigerant pump group, and the power mathematical model of the refrigeration unit, with the goal of achieving the target ice making rate and minimizing the total power of the ice making system.

10. The ice making rate control device of the ice storage system according to claim 9, 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 condensation temperature of the refrigeration unit through the temperature sensor and the refrigerant flow of the refrigeration unit through the flow sensor.

11. An electronic device, characterized in that: The processor, the communication interface, the memory and the communication bus are connected to each other via the communication bus. a memory storing a computer program; The processor is configured to implement the ice making rate control method of the ice storage system according to any one of claims 1 to 8 when executing the program stored in the memory.

12. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed, the ice making rate control method for an ice storage system according to any one of claims 1 to 8 is executed.

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