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

Abstract

The embodiment of the application provides a heat exchange quantity metering method and a controller, a heat exchange quantity metering system and a storage medium, and belongs to the technical field of heat exchange. The method comprises the following steps: obtaining the inlet flow of each inlet pipeline and the outlet flow of each outlet pipeline within a starting time to an ending time, and obtaining the inlet temperature at the starting time and the outlet temperature at the ending time; performing heat exchange quantity calculation according to the inlet flow, the inlet temperature, the outlet flow and the outlet temperature to obtain an initial heat exchange quantity; determining a refrigerant enthalpy value change amount according to the inlet temperature and the outlet temperature; determining a target error proportion according to the refrigerant enthalpy value change amount and the initial heat exchange quantity; if the target error proportion is greater than an error proportion threshold, increasing the ending time, and re-performing error calculation to obtain the target error proportion; if the target error proportion is less than or equal to the error proportion threshold, taking the initial heat exchange quantity as a target heat exchange quantity. The embodiment of the application can realize heat exchange quantity metering of a complex pipeline.

Description

Technical Field

[0001] This 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 Technology

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

[0003] Therefore, how to achieve heat exchange metering for complex pipelines has become an urgent technical problem to be solved. Summary of the Invention

[0004] The main objective of this application is to propose a heat exchange metering method, controller, heat exchange metering system, and storage medium, which aims to achieve heat exchange metering for complex pipelines.

[0005] To achieve the above objectives, a first aspect of this application provides a method for measuring heat exchange, the method comprising:

[0006] From the start time to the end time, the flow rate of the refrigerant entering the first number of inlet pipes is measured to obtain the inlet flow rate of each inlet pipe;

[0007] At the initial moment, the temperature of the refrigerant in each of the inlet pipes is measured to obtain the inlet temperature of each inlet pipe;

[0008] During the period from the start time to the end time, the flow rate of the refrigerant flowing out of the second number of outlet pipes is measured to obtain the outlet flow rate of each outlet pipe; wherein the first number and the second number are not both 1.

[0009] At the end time, the temperature of the refrigerant in each of the outlet pipes is measured to obtain the outlet temperature of each outlet pipe.

[0010] The initial heat exchange is calculated based on 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 of inlet pipes.

[0011] The change in refrigerant enthalpy is calculated based on the first number of inlet temperatures and the second number of outlet temperatures; the change in refrigerant enthalpy is used to characterize the error in the initial heat exchange.

[0012] The target error percentage is obtained by calculating the change in refrigerant enthalpy and the initial heat exchange.

[0013] If the target error ratio is greater than the preset error ratio threshold, the end time is increased, and the process proceeds to the step of measuring the flow rate of the refrigerant entering the first number of inlet pipes from the start time to the end time to obtain the inlet flow rate of each inlet pipe.

[0014] If the target error ratio is less than or equal to a preset error ratio threshold, the initial heat exchange is taken as the target heat exchange.

[0015] In some embodiments, the step of calculating the initial heat exchange based on 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 of inlet pipes, includes:

[0016] The inlet energy is calculated based on the inlet flow rate and inlet temperature of each inlet pipe.

[0017] The outlet energy is calculated based on the outlet flow rate and outlet temperature of each outlet pipe; wherein the sum of the first number of inlet flow rates is equal to the sum of the second number of outlet flow rates;

[0018] The initial heat exchange is obtained by calculating the energy difference based on the first quantity of inlet energy and the second quantity of outlet energy.

[0019] In some embodiments, the step of calculating the initial heat exchange based on the energy difference between the first quantity of the inlet energy and the second quantity of the outlet energy includes:

[0020] The total inlet energy is obtained by summing the first quantity of inlet energies.

[0021] The total export energy is obtained by summing the second quantity of the export energy.

[0022] The initial heat exchange is obtained by performing energy conservation calculations based on the total inlet energy and the total outlet energy.

[0023] In some embodiments, the change in refrigerant enthalpy includes the maximum change in refrigerant enthalpy; calculating the change in refrigerant enthalpy based on the first number of inlet temperatures and the second number of outlet temperatures includes:

[0024] The maximum inlet temperature is obtained by selecting the maximum temperature from the first number of inlet temperatures;

[0025] The minimum temperature is selected from the second number of outlet temperatures to obtain the minimum outlet temperature;

[0026] The maximum temperature change is obtained based on the difference between the maximum inlet temperature and the minimum outlet temperature.

[0027] The maximum change in refrigerant enthalpy is determined based on the maximum temperature change.

[0028] In some embodiments, the target error percentage is determined using the following formula:

[0029]

[0030] Indicates the percentage of target error; express t represents the end time; Indicated at the starting time The maximum change in the enthalpy of the refrigerant up to the end time t. Indicated at the starting time The change in refrigerant enthalpy up to the end time t; Indicated at the starting time The initial heat exchange up to the end time t; TH represents the upper limit threshold of the error, and the value range of TH is [0,1].

[0031] The The definition of is:

[0032]

[0033] i represents the i-th inlet pipe, i = 1, 2, ..., M; M represents the number of inlet pipes, i.e., the first quantity; j represents the j-th outlet pipe, j = 1, 2, ..., N; N represents the number of outlet pipes, i.e., the second quantity; Indicated at the starting time The inlet energy of the i-th inlet pipe up to the end time t; Indicated at the starting time Total energy at the entrance up to the end time t; Indicated at the starting time The output energy of the j-th outlet pipe up to the end time t; Indicated at the starting time The total energy at the exit point up to the end time t.

[0034] In some embodiments, the The definition of is:

[0035]

[0036] Indicated at the starting time The maximum change in the enthalpy of the refrigerant up to the end time t. Indicated at the starting time The change in refrigerant enthalpy up to the end time t; V represents the volume of the refrigerant. This indicates the density of the refrigerant. This indicates the specific heat capacity of the refrigerant. This indicates the maximum change in temperature.

[0037] In some embodiments, the The definition of is:

[0038]

[0039] Indicates the maximum temperature change; This represents the inlet temperature corresponding to the i-th inlet pipe; This represents the outlet temperature corresponding to the j-th outlet pipe;

[0040] Indicates the maximum inlet temperature;

[0041] This indicates the minimum outlet temperature.

[0042] To achieve the above objectives, a second aspect of this application provides a controller, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the heat exchange metering method described in the first aspect.

[0043] To achieve the above objectives, a third aspect of the present application provides a heat exchange metering system, characterized in that the system includes: 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;

[0044] The heat exchanger is connected to the inlet pipe and the outlet pipe; the inlet temperature measurement module and the inlet flow measurement module are deployed in the inlet pipe; the outlet temperature measurement module and the outlet flow measurement module are deployed in the outlet pipe; 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.

[0045] To achieve the above objectives, a fourth aspect of the present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the heat exchange metering method described in the first aspect.

[0046] The heat exchange metering method, controller, system, and storage medium proposed in this application measure the temperature and flow rate of each inlet and outlet pipe. This enables heat exchange calculation for complex pipeline applications with multiple inlet and outlet pipes, yielding the initial heat exchange. Furthermore, enthalpy is calculated based on multiple inlet and outlet temperatures to obtain the change in refrigerant enthalpy. Then, error calculation is performed based on the change in refrigerant enthalpy and the initial heat exchange to obtain the target error percentage. Since the measured temperature and flow rate data are related to the duration from the start to the end time, the target error percentage is also related to this duration. If the target error percentage exceeds a preset error percentage threshold, the end time is increased, i.e., the duration from the start to the end time is increased, thereby reducing the target error percentage. If the target error percentage is less than or equal to the preset error percentage threshold, the heat exchange accuracy is considered to meet the requirements. Therefore, based on the inlet flow rate, inlet temperature, outlet flow rate, and outlet temperature, the target heat exchange can be accurately calculated, achieving heat exchange metering for complex pipelines. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the heat exchange metering system provided in the embodiments of this application;

[0048] Figure 2 This is a flowchart of the heat exchange metering method provided in the embodiments of this application;

[0049] Figure 3 This is an embodiment provided by this application. Figure 2 The flowchart for step 105 in the document;

[0050] Figure 4 This is an embodiment provided by this application. Figure 3 The flowchart for step 203 in the text;

[0051] Figure 5 This is an embodiment provided by this application. Figure 2The flowchart for step 106 in the document;

[0052] Figure 6 This is a schematic diagram of the hardware structure of the controller provided in the embodiments of this application. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0054] It should be noted that although functional modules are divided in the device schematic diagram and a 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 aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0056] First, let's analyze some of the terms used in this application:

[0057] Refrigerant: A working fluid used in refrigeration systems (such as air conditioners) to transfer heat and produce a cooling effect. Refrigerants can include gaseous refrigerants and liquid refrigerants.

[0058] Heat (or Cold): Heat is an energy value used to express how much heat an object absorbs or releases. In refrigeration systems, cold can also be used to represent the energy consumed by the refrigeration system over a period of time through cooling. Cold and heat have the same physical nature. Numerically, cold is equal to a negative value of heat.

[0059] Reference temperature: A value used to quantify the temperature difference between objects. When calculating heat, a reference temperature provides a benchmark, making heat measurements and calculations comparable and consistent. A reference temperature is typically a fixed value, and its unit can be Celsius, Fahrenheit, or Kelvin.

[0060] The heat exchange metering method, controller, heat exchange metering system, and storage medium provided in this application are specifically described through the following embodiments. First, the heat exchange metering method in this application embodiment is described.

[0061] The heat exchange metering method provided in this application can be applied to a terminal, a server, or software running on either a terminal or a server. In some embodiments, the terminal can be a smartphone, tablet, laptop, desktop computer, etc.; the server can be configured as an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, 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, but is not limited to the above forms.

[0062] This application can be used in a wide variety of general-purpose or special-purpose computer system environments or configurations. Examples include: 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, and distributed computing environments including any of the above systems or devices. This 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. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0063] This application provides a heat exchange metering system that can implement the above-mentioned heat exchange metering method. The system includes: a controller (see reference...). Figure 6 Heat exchange equipment, inlet pipe, outlet pipe, inlet temperature measurement module, outlet temperature measurement module, inlet flow measurement module and outlet flow measurement module (the above inlet temperature measurement module, outlet temperature measurement module, inlet flow measurement module and outlet flow measurement module are not shown in the figure).

[0064] The heat exchanger is connected to the inlet and outlet pipelines; the inlet temperature measurement module and the inlet flow measurement module are deployed on the inlet pipeline; the outlet temperature measurement module and the outlet flow measurement module are deployed on the outlet pipeline; the controller communicates with the inlet temperature measurement module, the outlet temperature measurement module, the inlet flow measurement module, and the outlet flow measurement module.

[0065] Specifically, the inlet temperature measurement module and the outlet temperature measurement module can be thermometers. The inlet flow rate measurement module and the outlet flow rate measurement module can be flow meters.

[0066] Please see Figure 1 In one application example, the heat exchange metering system is as follows: Figure 1 As shown. In the heat exchange metering system of this application embodiment, 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 rate 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 rate 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 rate of outlet pipe Pout1, and Tout1 represents the outlet temperature of outlet pipe Pout1. Similarly, Lout2 and Tout2 represent the outlet flow rate and outlet temperature of outlet pipe Pout2, respectively, and Lout3 and Tout3 represent the outlet flow rate and outlet temperature of outlet pipe Pout3, respectively. Figure 1 The arrows in the diagram are used to indicate the direction of refrigerant flow in the pipe.

[0067] In some embodiments, it should be noted that in refrigeration applications, the heat exchange metering system can be a refrigeration system, and the heat exchange device can be a refrigerator, such as an air conditioner; or, in heating applications, the heat exchange metering system can also be a heating system, and the heat exchange device can include a heater and a heat exchanger. The heat exchange device can also be other devices used for heating or cooling, and this application embodiment does not limit this.

[0068] The specific implementation of the heat exchange metering system is basically the same as the specific implementation of the heat exchange metering method, and can be referred to below, and will not be repeated here.

[0069] Figure 2 This is an optional flowchart of the heat exchange metering method provided in the embodiments of this application. Figure 2 The method may include, but is not limited to, steps 101 to 109.

[0070] Step 101: From the start time to the end time, measure the flow rate of the refrigerant entering the first number of inlet pipes to obtain the inlet flow rate of each inlet pipe;

[0071] Step 102: At the start time, measure the temperature of the refrigerant in each inlet pipe to obtain the inlet temperature of each inlet pipe;

[0072] Step 103: During the period from the start time to the end time, measure the flow rate of the refrigerant flowing out of the second number of outlet pipes to obtain the outlet flow rate of each outlet pipe; wherein the first number and the second number are not both 1.

[0073] Step 104: At the end of the process, measure the temperature of the refrigerant in each outlet pipe to obtain the outlet temperature of each outlet pipe.

[0074] Step 105: Calculate the heat exchange based on 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 of outlet pipes, to obtain the initial heat exchange.

[0075] Step 106: Calculate the change in refrigerant enthalpy based on the first number of inlet temperatures and the second number of outlet temperatures; the change in refrigerant enthalpy is used to characterize the error in the initial heat exchange.

[0076] Step 107: Calculate the error based on the change in refrigerant enthalpy and the initial heat exchange to obtain the target error percentage;

[0077] Step 108: If the target error ratio is greater than the preset error ratio threshold, increase the end time and proceed to the step of measuring the flow rate of the refrigerant entering the first number of inlet pipes from the start time to the end time to obtain the inlet flow rate of each inlet pipe.

[0078] Step 109: If the target error ratio is less than or equal to the preset error ratio threshold, the initial heat exchange is taken as the target heat exchange.

[0079] The beneficial effects of this application's embodiments include, but are not limited to: measuring the temperature and flow rate of each inlet and outlet pipe, enabling heat exchange calculation for complex pipeline applications with multiple inlet and outlet pipes, thereby obtaining the initial heat exchange. Furthermore, enthalpy is calculated based on multiple inlet and outlet temperatures to obtain the change in refrigerant enthalpy; then, error is calculated based on the change in refrigerant enthalpy and the initial heat exchange to obtain the target error percentage. Since the measured temperature and flow rate data are related to the duration from the start to the end time, the target error percentage is also related to the duration from the start to the end time. If the target error percentage is greater than a preset error percentage threshold, the end time is increased, i.e., the duration from the start to the end time is increased, thereby reducing the target error percentage. If the target error percentage is less than or equal to the preset error percentage threshold, the accuracy of the heat exchange is considered to meet the requirements. Thus, based on the inlet flow rate, inlet temperature, outlet flow rate, and outlet temperature, the target heat exchange can be accurately calculated, achieving heat exchange metering for complex pipelines.

[0080] It should be noted that a heat exchange system is a system consisting of an inlet pipe, an outlet pipe, and heat exchange equipment. The inlet pipe connects to the heat exchange equipment, and the heat exchange equipment connects to the outlet pipe. The amount of heat exchanged refers to the heat exchanged between the heat exchange system and the environment.

[0081] It should be noted that in this embodiment, the heat exchange system is used for refrigeration, and the fluid in the pipes is refrigerant. Therefore, the heat exchange system specifically refers to a refrigeration system. The change in refrigerant enthalpy caused by temperature changes within the refrigeration system is not considered part of the heat exchange. Therefore, the change in refrigerant enthalpy can be used to characterize the error in the heat exchange. For example, in a refrigeration system, refrigerant from the inlet pipe flows into the heat exchange equipment, which performs refrigeration, thereby cooling the refrigerant and generating a change in heat. This change in heat can be divided into two parts: one part is the energy exchanged between the refrigeration system and the environment (e.g., the heat released by the server during cooling of a server room), which is the actual heat exchange; the other part is the change in refrigerant enthalpy caused by temperature changes, i.e., the energy change within the refrigeration system, which is not transferred to the environment. Therefore, the heat exchange calculated based on the change in heat may contain errors. Especially in refrigeration systems with long pipes, the volume of refrigerant within the pipes is large, so the change in refrigerant enthalpy caused by temperature changes cannot be ignored, meaning the measurement error of the heat exchange is relatively large. To address the aforementioned issues, this application embodiment considers that the change in refrigerant enthalpy is related to the measurement duration (i.e., the duration from the start time to the end time) corresponding to the heat exchange. A longer measurement duration results in a larger heat exchange, and the proportion of the change in refrigerant enthalpy in the heat exchange is smaller, thus the proportion of error in the heat exchange is smaller. However, excessively long measurement durations reduce the efficiency of heat exchange calculation and consume time. Current heat exchange metering methods struggle to estimate the measurement duration. Therefore, this application embodiment comprehensively considers the accuracy requirements and time efficiency of heat exchange calculation to determine the minimum measurement duration. Specifically, if the target error proportion equals the error proportion threshold, the duration from the start time to the end time can be used as the minimum measurement duration. Then, based on the minimum measurement duration, a new start time and a new end time are set so that the updated duration from the start time to the end time is greater than the minimum measurement duration. The flow rate and temperature are then measured based on the updated start time and end time to obtain the target heat exchange. This application embodiment improves the accuracy of the heat exchange metering method and enables heat exchange metering for complex pipelines.

[0082] In step 101 of some embodiments, the inlet flow rate can be expressed as the inlet mass flow rate. It should be noted that mass flow rate refers to the mass of fluid passing through a pipe cross-section per unit time, and its unit can be kg / h (kilograms per hour). Other types of data (such as volumetric flow rate) can also be used to represent the inlet or outlet flow rate, and are not limited to these. It should be noted that a flow sensor can be used to measure the flow rate of the refrigerant in the inlet pipe, thereby obtaining the inlet flow rate. Each inlet pipe is equipped with at least one flow sensor.

[0083] Specifically, the refrigerant can be a gaseous refrigerant or a liquid refrigerant, such as water.

[0084] In step 102 of some embodiments, a temperature sensor can be used to measure the temperature of the refrigerant in the inlet pipe, thereby obtaining the inlet temperature. Each inlet pipe is equipped with at least one temperature sensor.

[0085] In step 103 of some embodiments, the outlet flow rate can be expressed as the 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, thereby obtaining the outlet flow rate. Each outlet pipe is equipped with at least one flow sensor.

[0086] In step 104 of some embodiments, a temperature sensor can be used to measure the temperature of the refrigerant in the outlet pipe, thereby obtaining the outlet temperature. Each outlet pipe is equipped with at least one temperature sensor.

[0087] In step 105 of some embodiments, the first quantity is a positive integer, and the second quantity is also a positive integer, such as 1, 2, 3, etc. However, the first quantity and the second quantity cannot both be 1. That is to say, the heat exchange metering system has multiple inlet pipes, or multiple outlet pipes, or multiple inlet pipes and multiple outlet pipes.

[0088] In step 106 of some embodiments, the calculated initial heat exchange includes the actual heat exchange and the actual change in refrigerant enthalpy, but the actual change in refrigerant enthalpy is difficult to estimate accurately. Therefore, the change in refrigerant enthalpy calculated in the embodiments of this application refers to the maximum change in refrigerant enthalpy, that is, the maximum upper limit of the change in refrigerant enthalpy.

[0089] In step 107 of some embodiments, the target error percentage is obtained by dividing the change in refrigerant enthalpy by the initial heat exchange. It should be noted that the measurement duration refers to the time 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 will increase with the increase in measurement duration, and the initial heat exchange will also increase with the increase in measurement duration, but the growth rate of the initial heat exchange is faster than the growth rate of the change in refrigerant enthalpy. Therefore, the target error percentage will decrease.

[0090] In step 108 of some embodiments, after increasing the end time, the initial time can also be changed accordingly. The initial time does not specifically refer to a fixed time. For example, if the initial time is first set to 10:00 and the end time is set to 10:10, then the duration from the initial time to the end time is 10 minutes. After calculating the target error percentage, 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 could be 11:00, and the corresponding end time could be 11:20.

[0091] Specifically, the error ratio threshold can be any value from 0 to 1, such as 0.1%.

[0092] In step 109 of some embodiments, if the target error percentage is equal to a preset error percentage threshold, the minimum measurement duration can be obtained based on the duration from the start time to the end time. The minimum measurement duration is the minimum duration required for the heat exchange to meet the measurement accuracy requirements. The measurement accuracy requirement refers to the target error percentage corresponding to the heat exchange being less than or equal to the error percentage threshold.

[0093] Please see Figure 3 In some embodiments, step 105 may include, but is not limited to, steps 201 to 203:

[0094] Step 201: Calculate the inlet energy based on the inlet flow rate and inlet temperature of each inlet pipe;

[0095] Step 202: Calculate the outlet energy based on the outlet flow rate and outlet temperature of each outlet pipe; wherein, the sum of the first number of inlet flow rates is equal to the sum of the second number of outlet flow rates;

[0096] Step 203: Calculate the energy difference based on the first quantity of inlet energy and the second quantity of outlet energy to obtain the initial heat exchange.

[0097] 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 number of inlet energies and the second number of outlet energies to obtain the initial heat exchange, which is then used to calculate the target error ratio in subsequent calculations. This allows for accurate heat exchange measurement and enables the measurement of heat exchange in complex pipelines.

[0098] In step 201 of some embodiments, the inlet energy can be calculated using an energy formula, inlet flow rate, and inlet temperature. Specifically, the energy formula states that heat equals the product of flow rate, temperature, and specific heat capacity. Specific heat capacity refers to the specific heat capacity of the refrigerant.

[0099] In step 202 of some embodiments, the outlet energy can be calculated using the energy formula, outlet flow rate, and outlet temperature.

[0100] In step 203 of some embodiments, the initial heat exchange can be obtained by subtracting the sum of the inlet energy and the sum of the outlet energy.

[0101] Specifically, the energy in both inlet energy and outlet energy refers to heat.

[0102] Please see Figure 4In some embodiments, step 203 may include, but is not limited to, steps 301 to 303:

[0103] Step 301: Sum the inlet energies based on the first number of inlet energies to obtain the total inlet energy;

[0104] Step 302: Sum the output energies based on the second quantity to obtain the total output energy;

[0105] Step 303: Perform energy conservation calculations based on the total inlet energy and the total outlet energy to obtain the initial heat exchange.

[0106] The advantage of this embodiment is that after calculating the total inlet energy and the total outlet energy, energy conservation calculation is performed based on the total inlet energy and the total outlet energy to obtain the initial heat exchange. This enables the calculation of the heat exchange of a system with multiple inlet pipes and outlet pipes, realizing the metering of heat exchange in complex pipelines and accurately calculating the target heat exchange.

[0107] In step 303 of some embodiments, energy conservation calculation is performed based on the total inlet energy and the total outlet energy. This can be achieved by inputting the total inlet energy and the total outlet energy into a preset energy conservation formula to calculate the initial heat exchange.

[0108] It should be noted that, since the pipeline is closed, the total mass of refrigerant in all pipelines remains constant. Therefore, the sum of the inlet flow rates of all inlet pipelines measured within the same time period is equal to the sum of the outlet flow rates of all outlet pipelines, which satisfies the calculation conditions of the energy conservation equation.

[0109] Please see Figure 5 In some embodiments, the change in refrigerant enthalpy includes the maximum change in refrigerant enthalpy; step 106 may include, but is not limited to, steps 401 to 404:

[0110] Step 401: Select the maximum temperature from the first number of inlet temperatures to obtain the maximum inlet temperature;

[0111] Step 402: Select the minimum temperature from the second number of outlet temperatures to obtain the minimum outlet temperature;

[0112] Step 403: Obtain the maximum temperature change based on the difference between the maximum inlet temperature and the minimum outlet temperature;

[0113] Step 404: Determine the maximum change in refrigerant enthalpy based on the preset enthalpy change formula and the maximum temperature change.

[0114] The advantage of this embodiment is that it obtains the maximum temperature change based on the difference between the maximum inlet temperature and the minimum outlet temperature, and determines the maximum change in refrigerant enthalpy based on a preset enthalpy change formula and the maximum temperature change, thereby calculating the target error percentage, and then comparing the target error percentage with the error ratio threshold. This embodiment can accurately calculate the target heat exchange, realizing heat exchange metering for complex pipelines.

[0115] 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 exchanger in this embodiment 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.

[0116] In some embodiments, the target error percentage is determined using the following formula:

[0117] Formula (1);

[0118] Indicates the percentage of target error; Indicates the start time. The start and end times are indicated in hours (h). This represents the maximum change in refrigerant enthalpy from the start time to the end time, expressed in kJ (kilojoules). Indicates the starting time The change in refrigerant enthalpy up to the end time t, expressed in kJ; The initial heat exchange is expressed in kJ from the start time to the end time; TH represents the upper limit threshold of the error, and the value of TH ranges from [0,1].

[0119] The definition of is:

[0120] Formula (2);

[0121] i represents the i-th inlet pipe, i=1,2,...,M; M represents the number of inlet pipes, i.e., the first quantity; j represents the j-th outlet pipe, j=1,2,...,N; N represents the number of outlet pipes, i.e., the second quantity; Indicates the starting time The inlet energy of the i-th inlet pipe up to the end time t; Indicates the starting time Total energy at the entrance up to the end time t; Indicates the starting time The output energy of the j-th outlet pipe up to the end time t; Indicates the starting time The total energy at the exit point up to the end time t.

[0122] The advantage of this embodiment is that it calculates the target error percentage, thereby comparing the target error percentage with the error ratio threshold. If the target error percentage is less than or equal to the error ratio threshold, the initial heat exchange is taken as the target heat exchange, and the target heat exchange can be accurately calculated, thus realizing the heat exchange metering of complex pipelines.

[0123] Specifically, the upper limit of the error threshold can be 0.1%, or 0.3%, etc.

[0124] It should be noted that the start and end times for measuring the above data are consistent for each inlet pipe and each outlet pipe. Formula (2) is equivalent to the energy conservation relationship mentioned above.

[0125] In some embodiments, The definition of is:

[0126] Formula (3);

[0127] Indicates the starting time The inlet flow rate of the i-th inlet pipe up to the end time t; This indicates the specific heat capacity of the refrigerant; Indicates the starting time The inlet temperature of the i-th inlet pipe; Indicates reference temperature. Indicates a time interval.

[0128] It should be noted that the units for temperature (inlet and outlet temperatures) can be either Celsius or Fahrenheit. The inlet temperature can be standardized based on a preset reference temperature to obtain a standardized inlet temperature. The reference temperature is the same for each inlet and outlet pipe. For example, using 25°C as the reference temperature, the inlet temperature is 65°C, and the outlet temperature is 45°C. Based on the difference between the inlet temperature and the reference temperature, the standardized inlet temperature is 65 - 25 = 40°C; similarly, the standardized outlet temperature is 45 = 25 = 20°C.

[0129] Specifically, the reference temperature can also be the reference temperature of the temperature measurement module (such as a thermometer).

[0130] It should be noted that at the initial moment The measurement duration up to the end time t is Formula (3) above is used to calculate the inlet energy of each inlet pipe.

[0131] In some embodiments, The definition of is:

[0132] Formula (4);

[0133] Indicates the starting time The outlet flow rate of the j-th outlet pipe up to the end time t; This represents the outlet temperature of the j-th outlet pipe at the end time t. Indicates the reference temperature.

[0134] It should be noted that the above formula (4) is used to calculate the outlet energy of each outlet pipe.

[0135] In some embodiments, The definition of is:

[0136] Formula (5);

[0137] Indicates the starting time The maximum change in the enthalpy of the refrigerant up to the end time t. Indicates the starting time The change in refrigerant enthalpy up to the end time t; V represents the volume of the refrigerant. Indicates the density of the refrigerant. This indicates the specific heat capacity of the refrigerant. This indicates the maximum change in temperature.

[0138] The advantage of this embodiment is that it calculates the maximum change in refrigerant enthalpy based on the maximum temperature change, thereby calculating the target error percentage. Then, it compares the target error percentage with the error ratio threshold. If the target error percentage is less than or equal to the error ratio threshold, the initial heat exchange is taken as the target heat exchange, which can accurately calculate the target heat exchange and realize the heat exchange metering of complex pipelines.

[0139] Specifically, formula (5) is the above-mentioned enthalpy change relationship.

[0140] In some embodiments, The definition of is:

[0141]

[0142] Formula (6);

[0143] Indicates the maximum temperature change; This represents the inlet temperature corresponding to the i-th inlet pipe; This represents the outlet temperature corresponding to the j-th outlet pipe; Indicates the maximum inlet temperature;

[0144] This indicates the minimum outlet temperature.

[0145] The advantage of this embodiment is that the maximum temperature change is determined based on each inlet temperature and each outlet temperature, and the maximum change in refrigerant enthalpy is calculated based on the maximum temperature change, thereby enabling accurate calculation of the target heat exchange and realizing heat exchange metering for complex pipelines.

[0146] This application also provides a controller, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described heat exchange metering method. The controller can be a PLC (Programmable Lightwave Circuit). The controller can also include any smart terminal such as a tablet computer or in-vehicle computer; this application does not limit this.

[0147] Please see Figure 6 , Figure 6 The hardware structure of a controller according to another embodiment is illustrated. The controller includes:

[0148] The processor 601 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, 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 this application.

[0149] The memory 602 can be implemented as a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 602 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 602 and is called and executed by the processor 601 to execute the heat exchange metering method of the embodiments of this application.

[0150] The input / output interface 603 is used to implement information input and output;

[0151] The communication interface 604 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0152] Bus 605 transmits information between various components of the device (e.g., processor 601, memory 602, input / output interface 603, and communication interface 604);

[0153] The processor 601, memory 602, input / output interface 603, and communication interface 604 are connected to each other within the device via bus 605.

[0154] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described heat exchange metering method.

[0155] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0156] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0157] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0158] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0159] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0160] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0161] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0162] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, or indirect coupling or communication connection between the apparatus or units, and may be electrical, mechanical, or other forms.

[0163] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0164] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0165] If the integrated unit is implemented as 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 this application, in essence, 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. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0166] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A heat exchange metering method characterized by, The method comprises: In the starting time to the end time, the flow rate of the refrigerant entering the first number of inlet pipes is measured to obtain the inlet flow rate of each inlet pipe; In the starting time, the temperature of the refrigerant of each inlet pipe is measured to obtain the inlet temperature of each inlet pipe; In the starting time to the end time, the flow rate of the refrigerant flowing out of the second number of outlet pipes is measured to obtain the outlet flow rate of each outlet pipe; wherein the first number and the second number are not equal to 1 at the same time; In the end time, the temperature of the refrigerant of each outlet pipe is measured to obtain the outlet temperature of each outlet pipe; The heat exchange amount is calculated 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 of outlet pipes, to obtain an initial heat exchange amount; According to the inlet temperature of the first number of inlet pipes and the outlet temperature of the second number of outlet pipes, the refrigerant enthalpy value change amount is calculated; wherein the refrigerant enthalpy value change amount is used to represent the error of the initial heat exchange amount, and the refrigerant enthalpy value change amount includes a refrigerant enthalpy value maximum change amount; According to the refrigerant enthalpy value change amount and the initial heat exchange amount, the error calculation is performed to obtain a target error proportion; If the target error proportion is greater than a preset error proportion threshold, the end time is increased, and the step of measuring the flow rate of the refrigerant entering the first number of inlet pipes in the starting time to the end time is entered to obtain the inlet flow rate of each inlet pipe; If the target error proportion is less than or equal to the preset error proportion threshold, the initial heat exchange amount is taken as a target heat exchange amount; Wherein, the refrigerant enthalpy value change amount calculated according to the inlet temperature of the first number of inlet pipes and the outlet temperature of the second number of outlet pipes comprises: The maximum temperature of the inlet is obtained by selecting the maximum temperature from the inlet temperature of the first number of inlet pipes; The minimum temperature of the outlet is obtained by selecting the minimum temperature from the outlet temperature of the second number of outlet pipes; The temperature maximum change amount is obtained according to the difference between the inlet maximum temperature and the outlet minimum temperature; The refrigerant enthalpy value maximum change amount is determined according to the temperature maximum change amount; The target error proportion is determined by the following formula: represents a target error proportion; t0 represents a starting time, and t represents an ending time; represents a maximum change amount of the refrigerant enthalpy value within the starting time t0 to the ending time t, represents a change amount of the refrigerant enthalpy value within the starting time t0 to the ending time t; represents an initial heat exchange amount within the starting time t0 to the ending time t; TH represents an error upper threshold value, and the value range of the TH is [0, 1]; The Definition: i denotes the i-th inlet pipe, i = 1, 2,..., M; M denotes the number of inlet pipes, i.e. the first number; j denotes the j-th outlet pipe, j = 1, 2,..., N; N denotes the number of outlet pipes, i.e. the second number; Ei(t) denotes the inlet energy of the i-th inlet pipe within the start time t0 to the end time t; Etot(t) denotes the total inlet energy within the start time t0 to the end time t; Ej(t) denotes the outlet energy of the j-th outlet pipe within the start time t0 to the end time t; Etot(t) denotes the total outlet energy within the start time t0 to the end time t.

2. The heat exchange metering method according to claim 1, characterized in that, The initial heat exchange amount is calculated according to the inlet flow rate and the inlet temperature of each inlet pipe, and the outlet flow rate and the outlet temperature of each outlet pipe, comprising: The inlet energy is calculated according to the inlet flow rate and the inlet temperature of each inlet pipe; The outlet energy is calculated according to the outlet flow rate and the outlet temperature of each outlet pipe; wherein the sum of the inlet flow rate of the first number of inlet pipes is equal to the sum of the outlet flow rate of the second number of outlet pipes; The energy difference value calculation is performed according to the inlet energy of the first number of inlet pipes and the outlet energy of the second number of outlet pipes to obtain the initial heat exchange amount.

3. The heat exchange metering method according to claim 2, characterized in that, The energy difference calculation according to the first quantity of the inlet energy and the second quantity of the outlet energy obtains an initial heat exchange amount, including: Summation according to the first quantity of the inlet energy obtains an inlet total energy; Summation according to the second quantity of the outlet energy obtains an outlet total energy; Energy conservation calculation according to the inlet total energy and the outlet total energy obtains the initial heat exchange amount.

4. The heat exchange metering method according to claim 1, characterized in that, The is defined as: represents the maximum change in enthalpy of the refrigerant from the start time t0 to the end time t, represents the change in enthalpy of the refrigerant from the start time t0 to the end time t; V represents the volume of the refrigerant, p represents the density of the refrigerant, c p represents the specific heat capacity of the refrigerant, and max(ΔT) represents the maximum change in temperature.

5. The heat exchange metering method according to claim 4, characterized in that, The definition of the max (ΔT) is: max(ΔT) = max(T in,1 ,……,T in,i ,……,T in,M ) - min(T out,1 ,……,T out,j ,……,T out,N ), max(ΔT) represents the maximum temperature change; T in,i represents the inlet temperature corresponding to the ith inlet pipe; T out,j represents the outlet temperature corresponding to the jth outlet pipe; max(T in,1 ,……,T in,i ,……,T in,M ) represents the inlet maximum temperature; min(T out,1 ,……,T out,j ,……,T out,N ) represents the outlet minimum temperature.

6. A controller characterized by comprising: The controller includes a memory and a processor, the memory stores a computer program, and the processor implements the heat exchange amount measurement method in any one of claims 1 to 5 when executing the computer program.

7. A heat exchange metering system characterized by, The system includes: the controller of claim 6, 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 arranged on the inlet pipeline; the outlet temperature measurement module and the outlet flow measurement module are arranged on the outlet pipeline; and 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.

8. A computer-readable storage medium storing a computer program, the computer-readable storage medium comprising: The computer program is executed by the processor to implement the heat exchange amount measurement method in any one of claims 1 to 5.

Images