Heat exchange amount metering method, controller, heat exchange amount metering system and storage medium

Abstract

The embodiment of the invention provides a heat exchange amount metering method, a controller, a heat exchange amount metering system and a storage medium, and belongs to the technical field of heat exchange. The method comprises the steps that the inlet flow of each inlet pipeline and the outlet flow of each outlet pipeline are obtained from the starting moment to the ending moment, the inlet temperature is obtained at the starting moment, and the outlet temperature is obtained at the ending moment; heat exchange amount calculation is conducted according to the inlet flow, the inlet temperature, the outlet flow and the outlet temperature, and the initial heat exchange amount is obtained; determining refrigerant enthalpy value variation according to the inlet temperature and the outlet temperature; determining a target error proportion according to the refrigerant enthalpy value variation and the initial heat exchange amount; if the target error proportion is larger than the error proportion threshold value, the ending moment is increased, and error calculation is carried out again to obtain the target error proportion; and if the target error proportion is smaller than or equal to the error proportion threshold value, the initial heat exchange amount serves as the target heat exchange amount. According to the embodiment of the invention, the heat exchange amount of a complex pipeline can be metered.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchange metering method and controller, a heat exchange metering system and a storage medium. Background Art

[0002] A refrigeration system is a system that cools the environment by exchanging heat with the external environment through a low-temperature substance (such as a refrigerant). During the refrigeration process, the heat exchanged between the refrigeration system and the environment is called the heat exchange amount, and accurate measurement of the heat exchange amount is crucial to the design and operation of the refrigeration system. However, current heat exchange amount metering methods are generally applicable to simple pipelines (such as short pipelines, or simple pipelines with only one outlet pipe and one inlet pipe), and are difficult to apply to complex pipelines. For example, in a large computer room, there are multiple servers that need to be cooled. At this time, there are multiple heat exchange devices in the refrigeration system to cool each server, resulting in long and complex pipelines. Existing heat exchange amount metering methods are difficult to measure the heat exchange amount in this scenario.

[0003] Therefore, how to achieve heat exchange metering of complex pipelines has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to propose a heat exchange metering method and controller, a heat exchange metering system and a storage medium, aiming to achieve heat exchange metering of complex pipelines.

[0005] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides a heat exchange amount metering method, the method comprising: From the start time to the end time, measuring the flow rate of the refrigerant entering the first number of inlet pipes to obtain the inlet flow rate of each of the inlet pipes; At the starting time, measuring the temperature of the refrigerant in each of the inlet pipes to obtain the inlet temperature of each of the inlet pipes; During the period from the start time to the end time, measuring the flow rate of the refrigerant flowing out of the second number of outlet pipes to obtain the outlet flow rate of each of the outlet pipes; wherein the first number and the second number are not 1 at the same time; At the end time, measuring the temperature of the refrigerant in each of the outlet pipes to obtain the outlet temperature of each of the outlet pipes; Calculate the heat exchange amount according to the inlet flow rate and the inlet temperature of the first number of inlet pipes, and the outlet flow rate and the outlet temperature of the second number, to obtain an initial heat exchange amount; The change in enthalpy value of the refrigerant is calculated according to the inlet temperature of the first quantity and the outlet temperature of the second quantity; the change in enthalpy value of the refrigerant is used to characterize the error of the initial heat exchange amount; An error calculation is performed according to the change in the refrigerant enthalpy value and the initial heat exchange amount to obtain a target error ratio; If the target error ratio is greater than a preset error ratio threshold, the end time is increased, and the step of measuring the flow rate of the refrigerant entering the first number of the inlet pipes from the start time to the end time is performed to obtain the inlet flow rate of each of the inlet pipes; If the target error ratio is less than or equal to a preset error ratio threshold, the initial heat exchange amount is used as the target heat exchange amount.

[0006] In some embodiments, the heat exchange amount is calculated based on the inlet flow rate and the inlet temperature of the first number of inlet pipes, and the outlet flow rate and the outlet temperature of the second number to obtain the initial heat exchange amount, including: Calculating inlet energy according to the inlet flow rate and the inlet temperature of each inlet pipe; The outlet energy is calculated according to the outlet flow and the outlet temperature of each outlet pipe; wherein the sum of the inlet flow of the first number is equal to the sum of the outlet flow of the second number; An energy difference is calculated based on the first quantity of the inlet energy and the second quantity of the outlet energy to obtain an initial heat exchange amount.

[0007] In some embodiments, the energy difference calculation is performed according to the first quantity of the inlet energy and the second quantity of the outlet energy to obtain the initial heat exchange amount, including: Summing the inlet energies according to the first quantity to obtain the inlet total energy; Summing the outlet energies according to the second quantity to obtain the total outlet energy; The initial heat exchange amount is obtained by performing energy conservation calculation according to the inlet total energy and the outlet total energy.

[0008] In some embodiments, the refrigerant enthalpy value change includes a maximum refrigerant enthalpy value change; the refrigerant enthalpy value change is calculated according to the inlet temperature of the first quantity and the outlet temperature of the second quantity, including: Selecting a maximum temperature from the first number of inlet temperatures to obtain an inlet maximum temperature; Selecting a minimum temperature from the second number of outlet temperatures to obtain an outlet minimum temperature; Obtaining a maximum temperature change according to a difference between the maximum inlet temperature and the minimum outlet temperature; The maximum change in the refrigerant enthalpy value is determined according to the maximum temperature change.

[0009] In some embodiments, the target error ratio is determined by the following formula:

[0010] represents the target error ratio; express , t represents the end time; Indicates that at the starting time The maximum change in refrigerant enthalpy value from the end time t, Indicates that at the starting time Change in refrigerant enthalpy value from the end time t; Indicates that at the starting time The initial heat exchange amount from the end time t to the end time t; TH represents the upper limit threshold of the error, and the value range of TH is [0,1]; Said is defined as:

[0011] i represents the i-th inlet pipeline, i=1, 2, ..., M; M represents the number of inlet pipelines, that is, the first number; j represents the j-th outlet pipeline, j=1, 2, ..., N; N represents the number of outlet pipelines, that is, the second number; Indicates that at the starting time The inlet energy of the i-th inlet pipe within the end time t; Indicates that at the starting time Total inlet energy from the end time t; Indicates that at the starting time The outlet energy of the jth outlet pipeline within the end time t; Indicates that at the starting time The total outlet energy from the end time t.

[0012] In some embodiments, the is defined as:

[0013] Indicates that at the starting time The maximum change in refrigerant enthalpy value from the end time t, Indicates that at the starting time The change in the refrigerant enthalpy value from the start to the end time t; V represents the volume of the refrigerant, represents the density of the refrigerant, represents the specific heat capacity of the refrigerant, Indicates the maximum temperature change.

[0014] In some embodiments, the is defined as:

[0015] Indicates the maximum temperature change; represents the inlet temperature corresponding to the i-th inlet pipe; represents the outlet temperature corresponding to the jth outlet pipe; Indicates the maximum inlet temperature; Indicates the minimum outlet temperature.

[0016] To achieve the above-mentioned purpose, the second aspect of an embodiment of the present application proposes a controller, which includes a memory and a processor, the memory stores a computer program, and the processor implements the heat exchange metering method described in the first aspect when executing the computer program.

[0017] To achieve the above-mentioned purpose, a third aspect of an embodiment of the present application provides a heat exchange metering system, characterized in that the system comprises: the controller, heat exchange equipment, inlet pipeline, outlet pipeline, inlet temperature measurement module, outlet temperature measurement module, inlet flow measurement module and outlet flow measurement module described in the second aspect above; The heat exchange device is connected to the inlet pipeline and the outlet pipeline; the inlet temperature measurement module and the inlet flow measurement module are deployed in the inlet pipeline; the outlet temperature measurement module and the outlet flow measurement module are deployed in the outlet pipeline; the controller is communicatively connected to the inlet temperature measurement module, the outlet temperature measurement module, the inlet flow measurement module and the outlet flow measurement module.

[0018] To achieve the above objectives, the fourth aspect of an embodiment of the present application proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the heat exchange amount metering method described in the first aspect is implemented.

[0019] The heat exchange metering method and controller, heat exchange metering system and storage medium proposed in the present application measure the temperature and flow of each inlet pipe and each outlet pipe, and can calculate the heat exchange for complex pipeline application scenarios with multiple inlet pipes and outlet pipes, so as to obtain the initial heat exchange. In addition, the enthalpy value is calculated according to multiple inlet temperatures and multiple outlet temperatures to obtain the change in the enthalpy value of the refrigerant; then the error is calculated according to the change in the enthalpy value of the refrigerant and the initial heat exchange, and the target error ratio is obtained. Since the above-mentioned measured temperature and flow data are related to the time from the start time to the end time, the target error ratio is also related to the time from the start time to the end time. If the target error ratio is greater than the preset error ratio threshold, the end time is increased, that is, the time from the start time to the end time is increased, thereby reducing the target error ratio. If the target error ratio is less than or equal to the preset error ratio threshold, it is considered that the accuracy of the heat exchange meets the requirements, so that the target heat exchange can be accurately calculated according to the inlet flow, inlet temperature, outlet flow and outlet temperature, and the heat exchange metering of the complex pipeline is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a heat exchange metering system provided in an embodiment of the present application; Figure 2 is a flow chart of a heat exchange metering method provided in an embodiment of the present application; Figure 3 This is provided by an embodiment of the present application Figure 2 Flowchart of step 105 in; Figure 4 This is provided by an embodiment of the present application Figure 3 Flow chart of step 203 in; Figure 5 This is provided by an embodiment of the present application Figure 2 Flow chart of step 106 in; Figure 6 It is a schematic diagram of the hardware structure of the controller provided in the embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0024] First, some nouns involved in this application are analyzed: Refrigerant: It is a working fluid used to transfer heat energy and produce a refrigeration effect in a refrigeration system (such as air conditioning). Refrigerants can include gas refrigerants and liquid refrigerants.

[0025] Heat (cold): Heat is an energy value used to indicate how much heat an object absorbs or releases. In a refrigeration system, cold can also be used to indicate the energy consumed by the refrigeration system through refrigeration over a period of time. Cold has the same physical nature as heat. Numerically, cold is equal to negative heat.

[0026] Reference Temperature: A value used to quantify the temperature difference between objects. When calculating heat, the reference temperature can provide a reference point so that heat measurements and calculations are comparable and consistent. The reference temperature is usually a fixed value in degrees Celsius, Fahrenheit, or Kelvin.

[0027] The heat exchange metering method and controller, heat exchange metering system and storage medium provided in the embodiments of the present application are specifically illustrated through the following embodiments. First, the heat exchange metering method in the embodiments of the present application is described.

[0028] The heat exchange metering method provided in the embodiment of the present application can be applied to the terminal, can also be applied to the server side, and can also be software running in the terminal or the server side. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc.; the server side can be configured as an independent physical server, or a server cluster or distributed system composed of multiple physical servers, and can also be configured as a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application that implements the heat exchange metering method, etc., but is not limited to the above forms.

[0029] The present application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc. The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in distributed computing environments, in which tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0030] The embodiment of the present application provides a heat exchange metering system, which can implement the above heat exchange metering method, and the system includes: a controller (refer to Figure 6 ), heat exchange equipment, inlet pipeline, outlet pipeline, inlet temperature measurement module, outlet temperature measurement module, inlet flow measurement module and outlet flow measurement module (the inlet temperature measurement module, outlet temperature measurement module, inlet flow measurement module and outlet flow measurement module are not shown in the figure); The heat exchange equipment is connected to the inlet pipeline and the outlet pipeline; the inlet temperature measurement module and the inlet flow measurement module are deployed in the inlet pipeline; the outlet temperature measurement module and the outlet flow measurement module are deployed in the outlet pipeline; the controller communication is connected to the inlet temperature measurement module, the outlet temperature measurement module, the inlet flow measurement module and the outlet flow measurement module.

[0031] Specifically, the inlet temperature measurement module and the outlet temperature measurement module may be thermometers. The inlet flow measurement module and the outlet flow measurement module may be flow meters.

[0032] See also Figure 1 In one application example, the heat transfer metering system is Figure 1As shown. In the heat exchange metering system of the embodiment of the present application, there are two heat exchange devices, including heat exchange device A and heat exchange device B. There are two inlet pipes, including inlet pipe Pin1 and inlet pipe Pin2. Lin1 represents the inlet flow of inlet pipe Pin1, and Tin1 represents the inlet temperature of inlet pipe Pin1. Similarly, Lin2 and Tin2 represent the inlet temperature and inlet flow of inlet pipe Pin2, respectively. There are three outlet pipes, including outlet pipe Pout1, outlet pipe Pout2 and outlet pipe Pout3. Lout1 represents the outlet flow of outlet pipe Pout1, and Tout1 represents the outlet temperature of outlet pipe Pout1. Similarly, Lout2 and Tout2 represent the outlet flow and outlet temperature of outlet pipe Pout2, respectively, and Lout3 and Tout3 represent the outlet flow and outlet temperature of outlet pipe Pout3, respectively. Figure 1 The arrows in the figure are used to indicate the flow direction of the refrigerant in the pipe.

[0033] In some embodiments, it should be noted that in the application scenario of refrigeration, the heat exchange metering system may be a refrigeration system, and the heat exchange device may be a refrigerator, such as an air conditioner; or, in the application scenario of heating, the heat exchange metering system may also be a heating system, and the heat exchange device may include a heater and a heat exchanger. The heat exchange device may also be other devices for heating or cooling, which is not limited in the embodiments of the present application.

[0034] The specific implementation of the heat exchange metering system is substantially the same as the specific implementation of the heat exchange metering method, which may be referred to below and will not be described in detail here.

[0035] Figure 2 is an optional flow chart of the heat exchange metering method provided in the embodiment of the present application. Figure 2 The method may include but is not limited to steps 101 to 109.

[0036] Step 101, measuring the flow rate of the refrigerant entering a first number of inlet pipes from the start time to the end time, and obtaining the inlet flow rate of each inlet pipe; Step 102, at the start time, measuring the temperature of the refrigerant in each inlet pipe to obtain the inlet temperature of each inlet pipe; Step 103, measuring the flow rate of the refrigerant flowing out of the second number of outlet pipes from the start time to the end time, and obtaining the outlet flow rate of each outlet pipe; wherein the first number and the second number are not 1 at the same time; Step 104, at the end time, measuring the temperature of the refrigerant in each outlet pipe to obtain the outlet temperature of each outlet pipe; Step 105, calculating the heat exchange capacity according to the inlet flow rate and inlet temperature of the first number of inlet pipes and the outlet flow rate and outlet temperature of the second number to obtain an initial heat exchange capacity; Step 106, calculating the change in refrigerant enthalpy value according to the first number of inlet temperatures and the second number of outlet temperatures; the change in refrigerant enthalpy value is used to characterize the error of the initial heat exchange amount; Step 107, performing error calculation according to the change in the refrigerant enthalpy value and the initial heat exchange capacity to obtain a target error ratio; Step 108, if the target error ratio is greater than the preset error ratio threshold, increase the end time, and enter the step of measuring the flow of the refrigerant entering the first number of inlet pipes from the start time to the end time to obtain the inlet flow of each inlet pipe; Step 109: If the target error ratio is less than or equal to the preset error ratio threshold, the initial heat exchange amount is used as the target heat exchange amount.

[0037] The beneficial effects of the embodiments of the present application include but are not limited to: the temperature and flow rate of each inlet pipe and each outlet pipe are measured, and the heat exchange rate can be calculated for the complex pipeline application scenario with multiple inlet pipes and outlet pipes, so as to obtain the initial heat exchange rate. In addition, the enthalpy value is calculated according to multiple inlet temperatures and multiple outlet temperatures to obtain the change in the enthalpy value of the refrigerant; then the error is calculated according to the change in the enthalpy value of the refrigerant and the initial heat exchange rate to obtain the target error ratio. Since the above-mentioned measured temperature and flow rate data are related to the time from the start time to the end time, the target error ratio is also related to the time from the start time to the end time. If the target error ratio is greater than the preset error ratio threshold, the end time is increased, that is, the time from the start time to the end time is increased, thereby reducing the target error ratio. If the target error ratio is less than or equal to the preset error ratio threshold, it is considered that the accuracy of the heat exchange rate meets the requirements, so that according to the inlet flow rate, inlet temperature, outlet flow rate and outlet temperature, the target heat exchange rate can be accurately calculated, and the heat exchange rate measurement of the complex pipeline is realized.

[0038] It should be noted that the heat exchange system is a system consisting of an inlet pipe, an outlet pipe and a heat exchange device, wherein the inlet pipe is connected to the heat exchange device, and the heat exchange device is connected to the outlet pipe. The heat exchange amount refers to the heat exchanged between the heat exchange system and the environment.

[0039] It should be noted that in the embodiment of the present application, the heat exchange system is used for refrigeration, and the fluid in the pipeline is a refrigerant, so the heat exchange system specifically refers to a refrigeration system. The change in the enthalpy value of the refrigerant caused by the temperature change of the refrigerant inside the refrigeration system does not belong to the heat exchange amount, so the change in the enthalpy value of the refrigerant can be used to characterize the error of the heat exchange amount. For example, in a refrigeration system, the refrigerant in the inlet pipeline flows into the heat exchange device, and the heat exchange device performs refrigeration, thereby cooling the refrigerant and generating a heat change. The heat change can be divided into two parts, one of which is the energy exchanged between the refrigeration system and the environment (for example, cooling the server in the computer room, and the heat released by the server during this process), that is, the actual heat exchange amount; the other part is the change in the enthalpy value of the refrigerant caused by the temperature change of the refrigerant, that is, the energy change inside the refrigeration system, and this part of the energy is not transferred to the environment. Therefore, the heat exchange amount calculated based on the heat change may have an error. Especially in a refrigeration system with a long pipeline, the refrigerant volume in the pipeline is large, so the change in the enthalpy value of the refrigerant caused by the change in the temperature of the refrigerant cannot be ignored, that is, the measurement error of the heat exchange amount is large. In view of the above problems, the embodiment of the present application takes into account that the change in the enthalpy value of the refrigerant is related to the measurement time corresponding to the heat exchange amount (that is, the time from the start time to the end time). The longer the measurement time, the greater the heat exchange amount, and the smaller the proportion of the change in the enthalpy value of the refrigerant in the heat exchange amount, so the smaller the proportion of the error in the heat exchange amount. However, if the measurement time is too long, the efficiency of the heat exchange calculation will be reduced and time will be consumed. The current heat exchange metering method is difficult to estimate the measurement time. Therefore, the embodiment of the present application comprehensively considers the accuracy requirements of the heat exchange calculation and the time efficiency of the calculation to determine the minimum measurement time. Specifically, if the target error ratio is equal to the error ratio threshold, the time from the start time to the end time can be used as the minimum measurement time; then, according to the minimum measurement time, a new start time and a new end time are set so that the updated time from the start time to the end time is greater than the minimum measurement time, and then the flow rate and temperature are measured based on the updated start time and end time to obtain the target heat exchange amount. The embodiment of the present application can improve the accuracy of the heat exchange metering method and can realize the heat exchange metering of complex pipelines.

[0040] In step 101 of some embodiments, the inlet flow rate can be expressed as an inlet mass flow rate. It should be noted that the mass flow rate refers to the mass of the fluid passing through the pipe cross section per unit time, and its unit can be kg / h (kilograms per hour). Other types of data (such as volume flow rate) can also be used to represent the inlet flow rate or outlet flow rate, but are not limited to this. It should be noted that a flow sensor can be used to measure the flow rate of the refrigerant in the inlet pipe to obtain the inlet flow rate. Each inlet pipe is provided with at least one flow sensor.

[0041] Specifically, the refrigerant may be a gas refrigerant or a liquid refrigerant, such as water.

[0042] In step 102 of some embodiments, a temperature sensor may be used to measure the temperature of the refrigerant in the inlet pipe, thereby obtaining the inlet temperature. Each inlet pipe is provided with at least one temperature sensor.

[0043] In step 103 of some embodiments, the outlet flow rate can be expressed as an outlet mass flow rate. It should be noted that a flow sensor can be used to measure the flow rate of the refrigerant in the outlet pipe to obtain the outlet flow rate. Each outlet pipe is provided with at least one flow sensor.

[0044] In step 104 of some embodiments, a temperature sensor may be used to measure the temperature of the refrigerant in the outlet pipe, thereby obtaining the outlet temperature. Each outlet pipe is provided with at least one temperature sensor.

[0045] In step 105 of some embodiments, the first number is a positive integer, and the second number is also a positive integer, such as 1, 2, 3, etc. However, the first number and the second number cannot be both 1, that is, the heat exchange metering system has multiple inlet pipes, or multiple outlet pipes, or multiple inlet pipes and multiple outlet pipes.

[0046] In step 106 of some embodiments, the calculated initial heat exchange includes the actual heat exchange and the actual refrigerant enthalpy value change, and the actual refrigerant enthalpy value change is difficult to accurately estimate. Therefore, the refrigerant enthalpy value change calculated in the embodiment of the present application refers to the maximum refrigerant enthalpy value change, that is, the maximum upper limit of the refrigerant enthalpy value change.

[0047] In step 107 of some embodiments, the change in refrigerant enthalpy value is divided by the initial heat exchange amount to obtain the target error ratio. It should be noted that the measurement duration refers to the duration from the start time to the end time. Increasing the end time is equivalent to increasing the measurement duration. If the measurement duration is increased, the change in refrigerant enthalpy value will increase as the measurement duration increases, and the initial heat exchange amount will also increase as the measurement duration increases, but the growth rate of the initial heat exchange amount is faster than the growth rate of the change in refrigerant enthalpy value. Therefore, the target error ratio will become smaller.

[0048] In step 108 of some embodiments, after increasing the end time, the initial time may also be changed accordingly, and the initial time does not specifically refer to a fixed time. For example, first set the initial time to 10:00 and the end time to 10:10, then the duration from the initial time to the end time is 10 minutes. After calculating the target error ratio, the end time can be increased so that the duration from the initial time to the end time is 20 minutes. The adjusted initial time can be 11:00, and the corresponding end time can be 11:20.

[0049] Specifically, the error ratio threshold may be any value between 0 and 1, such as 0.1%.

[0050] In step 109 of some embodiments, if the target error ratio is equal to the preset error ratio threshold, the minimum measurement duration can be obtained according to the duration from the start time to the end time. The minimum measurement duration is the minimum duration for the heat exchange to meet the measurement accuracy requirement. The measurement accuracy requirement refers to the target error ratio corresponding to the heat exchange being less than or equal to the error ratio threshold.

[0051] See also Figure 3 In some embodiments, step 105 may include but is not limited to steps 201 to 203: Step 201, calculating the inlet energy according to the inlet flow rate and inlet temperature of each inlet pipeline; Step 202, calculating the outlet energy according to the outlet flow and outlet temperature of each outlet pipeline; wherein the sum of the first number of inlet flows is equal to the sum of the second number of outlet flows; Step 203, calculating the energy difference according to the first amount of inlet energy and the second amount of outlet energy to obtain an initial heat exchange amount.

[0052] The advantage of this embodiment is that after calculating the inlet energy of each inlet pipe and the outlet energy of each outlet pipe, the energy difference is calculated based on the first amount of inlet energy and the second amount of outlet energy to obtain the initial heat exchange rate, which is then used for the subsequent calculation of the target error ratio. The accurate heat exchange rate can be obtained, and the heat exchange rate measurement of complex pipelines is realized.

[0053] In step 201 of some embodiments, the inlet energy can be calculated by energy formula, inlet flow rate and inlet temperature. Specifically, the energy formula means that the heat is equal to the product of flow rate, temperature and specific heat capacity. Wherein, the specific heat capacity is the specific heat capacity of the refrigerant.

[0054] In step 202 of some embodiments, the outlet energy may be calculated using an energy formula, outlet flow rate, and outlet temperature.

[0055] In step 203 of some embodiments, the initial heat exchange amount may be obtained by subtracting the sum of the inlet energy and the sum of the outlet energy.

[0056] Specifically, the energy in both the inlet energy and the outlet energy refers to heat.

[0057] See also Figure 4 In some embodiments, step 203 may include but is not limited to steps 301 to 303: Step 301, summing up the first amount of inlet energies to obtain the total inlet energy; Step 302, summing the second amount of outlet energy to obtain the total outlet energy; Step 303: Perform energy conservation calculation based on the inlet total energy and the outlet total energy to obtain the initial heat exchange amount.

[0058] The advantage of this embodiment is that after calculating the inlet total energy and the outlet total energy, energy conservation calculation is performed based on the inlet total energy and the outlet total energy to obtain the initial heat exchange rate, so that the heat exchange rate of a system with multiple inlet pipes and outlet pipes can be calculated, and the heat exchange rate metering of complex pipelines is realized, and the target heat exchange rate can be accurately calculated.

[0059] In step 303 of some embodiments, energy conservation calculation is performed based on the inlet total energy and the outlet total energy, and the inlet total energy and the outlet total energy may be input into a preset energy conservation equation for calculation, thereby obtaining the initial heat exchange amount.

[0060] It should be noted that since the pipeline is closed, the overall refrigerant mass in all pipelines is constant. Therefore, the sum of the inlet flow rates of all inlet pipelines measured at the same time is equal to the sum of the outlet flow rates of all outlet pipelines, which meets the calculation conditions of the energy conservation relationship.

[0061] See also Figure 5 In some embodiments, the change in refrigerant enthalpy value includes the maximum change in refrigerant enthalpy value; step 106 may include but is not limited to steps 401 to 404: Step 401, selecting a maximum temperature from a first number of inlet temperatures to obtain an inlet maximum temperature; Step 402, selecting a minimum temperature from the second number of outlet temperatures to obtain an outlet minimum temperature; Step 403, obtaining the maximum temperature change according to the difference between the maximum inlet temperature and the minimum outlet temperature; Step 404, determining the maximum change in the refrigerant enthalpy value according to a preset enthalpy value change relationship and the maximum temperature change.

[0062] The advantage of this embodiment is that the maximum temperature change is obtained according to the difference between the maximum inlet temperature and the minimum outlet temperature, and the maximum change in refrigerant enthalpy is determined according to the preset enthalpy change relationship and the maximum temperature change, so as to calculate the target error ratio, and then compare the target error ratio with the error ratio threshold. The embodiment of the present application can accurately calculate the target heat exchange amount and realize the heat exchange measurement of complex pipelines.

[0063] In some embodiments, it should be noted that each inlet temperature in the first number of inlet temperatures is greater than each outlet temperature in the second number of outlet temperatures. Since the heat exchange device in the embodiment of the present application is used for refrigeration, the temperature of the refrigerant in the inlet pipe is greater than the temperature of the refrigerant in the outlet pipe.

[0064] In some embodiments, the target error ratio is determined by the following formula: Formula (1); represents the target error ratio; Indicates the starting time, Indicates the end time, the unit of the start time and the end time is h (hour); Indicates the maximum change in refrigerant enthalpy from the start time to the end time, in KJ (kilojoule); Indicates the starting time The change in refrigerant enthalpy from the end time t, in KJ; It represents the initial heat exchange from the start time to the end time, in KJ; TH represents the upper limit of the error, and the value range of TH is [0,1]; is defined as: Formula (2); i represents the i-th inlet pipe, i=1, 2, ..., M; M represents the number of inlet pipes, that is, the first number; j represents the j-th outlet pipe, j=1, 2, ..., N; N represents the number of outlet pipes, that is, the second number; Indicates the starting time The inlet energy of the i-th inlet pipe within the end time t; Indicates the starting time Total inlet energy from the end time t; Indicates the starting time The outlet energy of the jth outlet pipeline within the end time t; Indicates the starting time The total outlet energy from the end time t.

[0065] The advantage of this embodiment is that the target error ratio is calculated, so that the target error ratio can be compared with the error ratio threshold. If the target error ratio is less than or equal to the error ratio threshold, the initial heat exchange rate is used as the target heat exchange rate, and the target heat exchange rate can be accurately calculated, thereby realizing the heat exchange rate metering of complex pipelines.

[0066] Specifically, the upper error threshold may be 0.1%, or 0.3%, etc.

[0067] It should be noted that the start time and the end time of measuring the above data for each inlet pipe and each outlet pipe are consistent. Formula (2) is equivalent to the above energy conservation relation.

[0068] In some embodiments, is defined as: Formula (3); Indicates the starting time The inlet flow rate of the i-th inlet pipe within the end time t; Indicates the specific heat capacity of the refrigerant; Indicates the starting time The inlet temperature of the i-th inlet pipe; represents the reference temperature, Indicates a time interval.

[0069] It should be noted that the temperature (inlet temperature and outlet temperature) can be in Celsius or Fahrenheit. The inlet temperature data can be standardized according to the preset reference temperature to obtain the standardized inlet temperature. The reference temperature of each inlet pipe and outlet pipe is the same reference temperature. For example, taking 25°C (Celsius) as the reference temperature, the inlet temperature is 65°C and the outlet temperature is 45°C. According to the difference between the inlet temperature and the reference temperature, the standardized inlet temperature of 65-25=40°C can be obtained; similarly, the standardized outlet temperature of 45=25=20°C can also be obtained.

[0070] Specifically, the reference temperature may also be a reference temperature of a temperature measurement module (such as a thermometer).

[0071] It should be noted that at the start time The measurement duration from the end time t is The above formula (3) is used to calculate the inlet energy of each inlet pipe.

[0072] In some embodiments, is defined as: Formula (4); Indicates the starting time The outlet flow rate of the jth outlet pipe within the end time t; represents the outlet temperature of the jth outlet pipe at the end time t. Indicates the reference temperature.

[0073] It should be noted that the above formula (4) is used to calculate the outlet energy of each outlet pipeline.

[0074] In some embodiments, is defined as: Formula (5); Indicates the starting time The maximum change in refrigerant enthalpy value from the end time t, Indicates the starting time The change in the refrigerant enthalpy value from the end time t; V represents the volume of the refrigerant, Indicates the density of the refrigerant. Represents the specific heat capacity of the refrigerant, Indicates the maximum temperature change.

[0075] The advantage of this embodiment is that the maximum change in the refrigerant enthalpy value is calculated based on the maximum temperature change, so that the target error ratio can be calculated, and then the target error ratio is compared with the error ratio threshold. If the target error ratio is less than or equal to the error ratio threshold, the initial heat exchange rate is used as the target heat exchange rate, and the target heat exchange rate can be accurately calculated, thereby realizing the heat exchange rate metering of complex pipelines.

[0076] Specifically, formula (5) is the above-mentioned enthalpy change relationship.

[0077] In some embodiments, is defined as:

[0078] Formula (6); Indicates the maximum temperature change; represents the inlet temperature corresponding to the i-th inlet pipe; represents the outlet temperature corresponding to the jth outlet pipe; Indicates the maximum inlet temperature; Indicates the minimum outlet temperature.

[0079] The advantage of this embodiment is that the maximum temperature change is determined according to each inlet temperature and each outlet temperature, and the maximum change in the refrigerant enthalpy value is calculated based on the maximum temperature change, and then the target heat exchange can be accurately calculated, thereby realizing the heat exchange metering of complex pipelines.

[0080] The embodiment of the present application also provides a controller, the controller includes a memory and a processor, the memory stores a computer program, and the processor implements the above heat exchange metering method when executing the computer program. The controller can be a PLC (Programmable Logic Controller, Planar Lightwave Circuit, referred to as PLC). The controller can also include any smart terminal such as a tablet computer, a car computer, etc., which is not limited in the embodiment of the present application.

[0081] See also Figure 6 , Figure 6 The hardware structure of a controller of another embodiment is illustrated, and the controller includes: The processor 601 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application; The memory 602 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 602 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 602, and the processor 601 calls and executes the heat exchange metering method of the embodiment of this application; Input / output interface 603, used to implement information input and output; Communication interface 604, used to realize communication interaction between the device and other devices, which can be realized through wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WIFI, Bluetooth, etc.); A bus 605 that transmits information between various components of the device (e.g., processor 601, memory 602, input / output interface 603, and communication interface 604); The processor 601 , the memory 602 , the input / output interface 603 and the communication interface 604 are connected to each other in communication within the device via a bus 605 .

[0082] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above-mentioned heat exchange amount metering method is implemented.

[0083] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0084] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0085] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0086] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0087] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0088] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0089] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0090] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. The mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0091] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0092] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0093] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including multiple instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store programs.

[0094] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A method for measuring heat exchange, characterized in that: The method comprises: From the start time to the end time, measuring the flow rate of the refrigerant entering the first number of inlet pipes to obtain the inlet flow rate of each of the inlet pipes; At the starting time, measuring the temperature of the refrigerant in each of the inlet pipes to obtain the inlet temperature of each of the inlet pipes; During the period from the start time to the end time, measuring the flow rate of the refrigerant flowing out of the second number of outlet pipes to obtain the outlet flow rate of each of the outlet pipes; wherein the first number and the second number are not 1 at the same time; At the end time, measuring the temperature of the refrigerant in each of the outlet pipes to obtain the outlet temperature of each of the outlet pipes; Calculate the heat exchange amount according to the inlet flow rate and the inlet temperature of the first number of inlet pipes, and the outlet flow rate and the outlet temperature of the second number, to obtain an initial heat exchange amount; The change in enthalpy value of the refrigerant is calculated according to the inlet temperature of the first quantity and the outlet temperature of the second quantity; the change in enthalpy value of the refrigerant is used to characterize the error of the initial heat exchange amount; An error calculation is performed according to the change in the refrigerant enthalpy value and the initial heat exchange amount to obtain a target error ratio; If the target error ratio is greater than a preset error ratio threshold, the end time is increased, and the step of measuring the flow rate of the refrigerant entering the first number of the inlet pipes from the start time to the end time is performed to obtain the inlet flow rate of each of the inlet pipes; If the target error ratio is less than or equal to a preset error ratio threshold, the initial heat exchange amount is used as the target heat exchange amount.

2. The heat exchange amount measurement method according to claim 1, characterized in that: The heat exchange calculation is performed according to the inlet flow and the inlet temperature of the first number of inlet pipes, and the outlet flow and the outlet temperature of the second number, to obtain an initial heat exchange amount, including: Calculating inlet energy according to the inlet flow rate and the inlet temperature of each inlet pipe; The outlet energy is calculated according to the outlet flow and the outlet temperature of each outlet pipe; wherein the sum of the inlet flow of the first number is equal to the sum of the outlet flow of the second number; An energy difference is calculated based on the first quantity of the inlet energy and the second quantity of the outlet energy to obtain an initial heat exchange amount.

3. The heat exchange amount measurement method according to claim 2, characterized in that: The calculating of the energy difference according to the first quantity of the inlet energy and the second quantity of the outlet energy to obtain the initial heat exchange amount includes: Summing the inlet energies according to the first quantity to obtain the inlet total energy; Summing the outlet energies according to the second quantity to obtain the total outlet energy; The initial heat exchange amount is obtained by performing energy conservation calculation according to the inlet total energy and the outlet total energy.

4. The heat exchange amount measurement method according to claim 1, characterized in that: The refrigerant enthalpy value change includes a maximum refrigerant enthalpy value change; the refrigerant enthalpy value change is calculated based on the inlet temperature of the first quantity and the outlet temperature of the second quantity, including: Selecting a maximum temperature from the first number of inlet temperatures to obtain an inlet maximum temperature; Selecting a minimum temperature from the second number of outlet temperatures to obtain an outlet minimum temperature; Obtaining a maximum temperature change according to a difference between the maximum inlet temperature and the minimum outlet temperature; The maximum change in the refrigerant enthalpy value is determined according to the maximum temperature change.

5. The heat exchange amount measurement method according to any one of claims 1 to 4, characterized in that: The target error ratio is determined by the following formula: represents the target error ratio; express , t represents the end time; Indicates that at the starting time The maximum change in refrigerant enthalpy value from the end time t, Indicates that at the starting time Change in refrigerant enthalpy value from the end time t; Indicates that at the starting time The initial heat exchange rate from the end time t; TH represents the upper error threshold, and the value range of TH is [0,1]; Said is defined as: i represents the i-th inlet pipeline, i=1, 2, ..., M; M represents the number of inlet pipelines, that is, the first number; j represents the j-th outlet pipeline, j=1, 2, ..., N; N represents the number of outlet pipelines, that is, the second number; Indicates that at the starting time The inlet energy of the i-th inlet pipe within the end time t; Indicates that at the starting time Total inlet energy from the end time t; Indicates that at the starting time The outlet energy of the jth outlet pipeline within the end time t; Indicates that at the starting time The total outlet energy from the end time t.

6. The heat exchange amount measurement method according to claim 5, characterized in that: Said is defined as: Indicates that at the starting time The maximum change in refrigerant enthalpy value from the end time t, Indicates that at the starting time The change in the refrigerant enthalpy value from the start to the end time t; V represents the volume of the refrigerant, represents the density of the refrigerant, represents the specific heat capacity of the refrigerant, Indicates the maximum temperature change.

7. The heat exchange amount measurement method according to claim 6, characterized in that: Said is defined as: Indicates the maximum temperature change; represents the inlet temperature corresponding to the i-th inlet pipe; represents the outlet temperature corresponding to the jth outlet pipe; Indicates the maximum inlet temperature; Indicates the minimum outlet temperature.

8. A controller, characterized in that: The controller includes a memory and a processor, the memory stores a computer program, and the processor implements the heat exchange amount metering method according to any one of claims 1 to 7 when executing the computer program.

9. A heat exchange metering system, characterized in that: The system comprises: the controller according to claim 8, a heat exchange device, an inlet pipeline, an outlet pipeline, an inlet temperature measurement module, an outlet temperature measurement module, an inlet flow measurement module and an outlet flow measurement module; The heat exchange device is connected to the inlet pipeline and the outlet pipeline; the inlet temperature measurement module and the inlet flow measurement module are deployed in the inlet pipeline; the outlet temperature measurement module and the outlet flow measurement module are deployed in the outlet pipeline; the controller is communicatively connected to the inlet temperature measurement module, the outlet temperature measurement module, the inlet flow measurement module and the outlet flow measurement module.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the heat exchange metering method according to any one of claims 1 to 7 is implemented.

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