Side plate type heat exchanger performance test system and test method

Abstract

The invention discloses a side plate type heat exchanger performance testing system and method, and relates to the technical field of heat exchanger testing, and the system comprises a computer which is used for constructing a digital twinborn model, generating multiple groups of dynamic working condition data, inputting the multiple groups of dynamic working condition data into the digital twinborn model to obtain dynamic performance data, screening according to the sensitivity coefficient of each piece of dynamic performance data to obtain sensitive working condition data; the test equipment executes the sensitive working condition data and collects actual measurement state data of the side plate type heat exchanger; and the computer judges whether the performance of the side plate heat exchanger meets the design requirement according to the actually measured state data. Physical modeling is carried out on the heat exchanger in a digital twinning mode, heat exchange simulation is carried out on the heat exchanger, invalid test working conditions are deleted from a parameter set, only sensitive working conditions are reserved, and time, manpower and energy cost needed by testing is greatly saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchanger testing, and in particular to a side plate heat exchanger performance testing system and testing method. BACKGROUND

[0002] The side plate heat exchanger is one of commonly used heat exchangers. Through stacking of multiple plate cores, hot medium and cold medium flow in opposite directions between adjacent two cores, high-efficiency heat exchange is achieved through a large contact area, and the heat exchanger of this form has a small volume, so it has been widely used in industry.

[0003] In the design process of the side plate heat exchanger, data of the use scene need to be collected in advance, such as flow, temperature and pressure of the hot medium and the cold medium, and then key parameters such as the size and the number of layers of the core are selected accordingly. After the design is completed and the sample is manufactured, the heat exchanger needs to be tested to determine whether the sample meets the actual use requirements. In the testing process, the actual use environment needs to be simulated to inject hot medium and cold medium into the heat exchanger, and the flow, temperature and pressure of the medium need to be controlled according to the design requirements. In most working conditions, the parameters of the medium are stable, but in some cases, these parameters also change, and it is these changing working conditions that test the performance of the heat exchanger. If the heat exchanger can withstand all changing working conditions and achieve the required performance, then such heat exchanger is qualified.

[0004] However, in the current testing process of changing working conditions, various parameters of changing working conditions are prepared in advance, and then implemented on the heat exchanger. When the number of parameters to be tested is large, a lot of time needs to be spent, resulting in high cost. SUMMARY

[0005] The present application provides a side plate heat exchanger performance testing system and testing method to solve the problem of high testing cost caused by implementing all testing parameters on the heat exchanger in the prior art.

[0006] In one aspect, the present application provides a side plate heat exchanger performance testing system, comprising: a computer, configured to construct a digital twin model by using physical data collected from the side plate heat exchanger, generate a plurality of groups of dynamic working condition data within a set working condition range, input the plurality of groups of dynamic working condition data into the digital twin model in simulation software, obtain dynamic performance data of the digital twin model under each group of dynamic working condition data, calculate a sensitive coefficient of each dynamic performance data, filter the dynamic working condition data according to the sensitive coefficient, and obtain sensitive working condition data; The test equipment is connected to the hot side inlet and outlet and the cold side inlet and outlet of the side plate heat exchanger, and the test equipment inputs the hot side medium and the cold side medium into the side plate heat exchanger according to the sensitive working condition data, and collects the measured state data of the side plate heat exchanger at the hot side inlet and outlet and the cold side inlet and outlet. The computer judges whether the performance of the side plate heat exchanger meets the design requirement according to the measured state data.

[0007] In another aspect, the embodiment of the present application also provides a side plate heat exchanger performance test method, comprising: A digital twin model is constructed by using the physical data collected from the side plate heat exchanger; A plurality of groups of dynamic working condition data are generated within a set working condition range, the plurality of groups of dynamic working condition data are input into the digital twin model in simulation software, and dynamic performance data of the digital twin model under each group of dynamic working condition data are obtained; A sensitive coefficient of each dynamic performance data is calculated, the dynamic working condition data are screened according to the sensitive coefficient, and sensitive working condition data are obtained; The test equipment inputs the hot side medium and the cold side medium into the side plate heat exchanger according to the sensitive working condition data, and collects the measured state data of the side plate heat exchanger at the hot side inlet and outlet and the cold side inlet and outlet; The computer judges whether the performance of the side plate heat exchanger meets the design requirement according to the measured state data.

[0008] The side plate heat exchanger performance test system and test method in the present application have the following advantages: The digital twin method is used to physically model the heat exchanger, and the heat exchange of the heat exchanger under various dynamic parameters is simulated in simulation software, so as to delete invalid test working conditions from the parameter set, and only sensitive working conditions are reserved. Not only the time, manpower and energy cost required for testing are greatly saved, but also the heat exchanger is tested in a targeted manner in a limited time, and the performance of the heat exchanger under working conditions that may cause failure is as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0010] Figure 1 A composition schematic diagram of a side plate heat exchanger performance test system provided by the embodiment of the present application.

[0011] Figure 2A flow chart of a side plate heat exchanger performance test method provided by an embodiment of the present application.

[0012] BRIEF DESCRIPTION OF DRAWINGS: 100, computer; 201, hot side oil temperature machine; 202, hot side valve; 203, hot side flow meter; 204, hot side inlet thermometer; 205, hot side inlet pressure gauge; 206, hot side outlet thermometer; 207, hot side outlet pressure gauge; 210, cold side oil temperature machine; 211, cold side valve; 212, cold side flow meter; 213, cold side inlet thermometer; 214, cold side inlet pressure gauge; 215, cold side outlet thermometer; 216, cold side outlet pressure gauge; 220, auxiliary heat exchanger; 221, auxiliary valve; 222, auxiliary water cooler; 300, side plate heat exchanger. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0014] Figure 1 A composition schematic diagram of a side plate heat exchanger performance test system provided by an embodiment of the present application. The embodiment of the present application provides a side plate heat exchanger performance test system, which comprises: The computer 100 is configured to construct a digital twin model by using physical data collected from the side plate heat exchanger 300, generate a plurality of groups of dynamic working condition data within a set working condition range, input the plurality of groups of dynamic working condition data into the digital twin model in simulation software, obtain dynamic performance data of the digital twin model under each group of dynamic working condition data, calculate a sensitive coefficient of each dynamic performance data, filter the dynamic working condition data according to the sensitive coefficient, and obtain sensitive working condition data. The test equipment is connected to the hot side inlet and outlet and the cold side inlet and outlet of the side plate heat exchanger 300, and the test equipment inputs hot side medium and cold side medium into the side plate heat exchanger 300 according to the sensitive working condition data, and collects measured state data of the side plate heat exchanger 300 at the hot side inlet and outlet and the cold side inlet and outlet. The computer 100 determines whether the performance of the side plate heat exchanger 300 meets the design requirements according to the measured state data.

[0015] Exemplarily, before starting the test, the test target and parameter definition need to be determined first, wherein the test target can include a flow fluctuation range and a temperature step amplitude, and the parameters include the following contents: Working condition data of the input medium, including cold side instantaneous input flow qc t hot side instantaneous input flow rate q h t hot side inlet temperature T hin t cold side inlet temperature T cin t and system pressure P t ; output medium working condition data, including instantaneous heat exchange amount Q t hot side outlet temperature T hout t cold side outlet temperature T cout t pressure drop Δ P t and core hotspot temperature T hot t ; working condition boundary, including frequency fluctuation range f ∈[ f min , f max ] amplitude range delta =Δ x / x 0∈[ delta min , delta max ] where, f min and f max are the minimum and maximum values of the frequency fluctuation, Δ x is the flow rate or temperature, x 0 is the rated value of the flow rate or temperature, delta min and delta max are the minimum and maximum values of the amplitude.

[0016] Then, the digital twin model will be built, and before the modeling starts, the physical data of the side plate heat exchanger 300 will be collected first. Specifically, the physical data is collected by a three-dimensional scanning device, which is connected to the computer 100 through a data cable. The three-dimensional scanning device uses laser scanning technology to collect the three-dimensional point cloud of the side plate heat exchanger, and the computer 100 extracts and analyzes the three-dimensional point cloud to obtain the physical data therein.​​​​​​​​​​

[0017] The physical data includes the size of the core, the corrugation, and the flow channel, and during the collection of the physical data, it is necessary to ensure that the difference between the collected physical data and the real data is small. The difference between the physical data and the real data is required to be within 0.1% of the real data, so as to ensure the accuracy of the digital twin model constructed.

[0018] Further, after the digital twin model is constructed, the computer 100 implants a dynamic physical law in the digital twin model, and the dynamic physical law includes a non-steady flow law, a heat transfer model, and a structural mechanics model.

[0019] The non-steady flow law is described by a non-steady Navier-Stokes equation:

[0020] In the above formula, rho is the density of the medium, and u is the velocity vector of the medium, t represents time, is a vector differential operator, p is pressure, mu is the dynamic viscosity of the medium, and the upper subscript T represents transposition, and f is the body force.

[0021] The heat transfer model is represented as:

[0022] In the above formula, C is the heat capacity of the side plate heat exchanger 300, K is the dynamic heat transfer coefficient, t is the heat transfer area, F Q loss is the heat loss. T h and T c are collectively referred to as the hot side temperature and the cold side temperature, respectively, and during calculation, if T h the hot side inlet temperature is taken, then T c the cold side inlet temperature needs to be taken, and if T h the hot side outlet temperature is taken, then T c the cold side outlet temperature needs to be taken.

[0023] The structural mechanics model is represented as:

[0024] In the above formula,​rho s is the core density, delta t is the core deformation, sigma t is the stress tensor, is the thermal stress load.

[0025] Further, after constructing the digital twin model, the computer 100 establishes an input-output mapping model, which represents the mapping relationship between the input medium and the output medium in the digital twin model in terms of temperature, pressure drop and heat exchange amount.

[0026] The input-output mapping model is represented as follows:

[0027] In the above formula, f 1 and f 2 are the temperature mapping function and the heat exchange mapping function, respectively, c h and c c are the specific heat capacities of the hot-side medium and the cold-side medium, respectively.

[0028] Further, after constructing the digital twin model, the computer 100 selects multiple sets of steady-state operating condition data, and after the test equipment executes the multiple sets of steady-state operating condition data on the side plate heat exchanger 300 and collects the corresponding steady-state performance data, the computer 100 corrects the model parameters in the digital twin model according to the steady-state performance data.

[0029] Specifically, a plurality of sets of steady-state operating condition data can be preselected, for example, the steady-state flow rate of the hot-side medium n q h k · q h0 , k = 0.5, 1.0, 1.5, the cold-side medium q c k · q c0 , wherein q h0 and q c0 ​​​​​The rated value of the steady-state flow rate of the hot-side medium and the steady-state flow rate of the cold-side medium, respectively. According to these steady-state operating condition data, the hot-side medium and the cold-side medium are input into the side plate heat exchanger 300, and the measured state data of the side plate heat exchanger 300 can be collected at the hot-side outlet and the cold-side outlet, respectively, and then the measured performance data of the side plate heat exchanger, i.e., the steady-state performance data, can be calculated according to the measured state data. Then the steady-state operating condition data can be used to modify the digital twin model, and then the corresponding predicted performance data can be obtained, the root mean square error of the steady-state performance data and the corresponding predicted performance data is calculated, and the model coefficients of the digital twin model, such as the correction coefficient in the heat exchange coefficient empirical formula and the friction coefficient of the sealing element, are adjusted according to the root mean square error, so that the root mean square error finally reaches within 5%.

[0030] In addition to using steady-state operating condition data to modify the digital twin model, the inertia parameters in the model, such as the residence time of the fluid in the flow channel and the specific heat capacity of the core, can also be modified using dynamic operating condition data. The specific modification method is the same as the modification process based on steady-state operating condition data, which will not be described here.

[0031] After the modification of the digital twin model is completed, the model has a high degree of accuracy and can be applied to the screening of dynamic operating condition data. Before starting the screening, m groups of dynamic operating condition data can be generated within the frequency fluctuation range f and the amplitude range delta After each group of dynamic operating condition data is input into the digital twin model, a corresponding group of dynamic performance data can be obtained, and the m groups of dynamic performance data can form a dynamic performance matrix Y The elements in the matrix, i.e., each dynamic performance data, are represented by y .

[0032] Then the sensitivity coefficient is calculated according to the following formula S :

[0033] In the above formula, Δ y is the change of the dynamic performance data, i.e., the difference between the current dynamic performance data y and the average value , and Δ x’ is the change of the dynamic operating condition data, i.e., the difference between the current dynamic operating condition data x’ and the average value .

[0034] After obtaining the sensitivity coefficient of each group of dynamic operating condition data, it can be compared with the sensitivity threshold S 0, and only the dynamic operating condition data with a sensitivity coefficient greater than the sensitivity threshold is retained, and the boundary condition is also retained, for example delta = deltamax and f = f max The remaining dynamic working condition data is considered as invalid working condition, and finally needs to be removed.

[0035] In the embodiments of the present application, in addition to retaining sensitive working conditions and boundary working conditions, typical application working conditions in actual application scenarios can also be retained, such as day-night load fluctuation curves of vehicle heat pumps, rapid acceleration / deceleration flow changes of vehicle-mounted heat exchangers, etc., to ensure that the retained dynamic working condition data matches the actual application scenario.

[0036] After obtaining the sensitive working condition data, the test equipment can execute these data, and then the acquisition equipment in the test equipment can acquire the measured state data of the side plate heat exchanger 300, such as acquiring temperature by using an optical fiber sensor and acquiring flow by using a high-frequency flowmeter.

[0037] Further, after the test equipment executes the sensitive working condition data and acquires the measured state data, the computer 100 corrects the dynamic parameters of the digital twin model based on the difference between the predicted state data corresponding to the sensitive working condition data and the measured state data.

[0038] Specifically, after obtaining the predicted state data and the measured state data, the ratio of the difference between the predicted state data and the measured state data to the measured state data can be taken as the dynamic response error e Then, a machine learning algorithm, such as a random forest, is used to adjust the dynamic parameters of the digital twin model, such as the inertia coefficient tau so that the dynamic response error e of the dynamic parameters is reduced to within 3%.

[0039] Further, after correcting the digital twin model, the computer 100 predicts the predicted performance data corresponding to the untested working condition data other than the sensitive working condition data in the plurality of sets of dynamic working condition data by using the corrected digital twin model, and combines the predicted performance data with the measured performance data corresponding to the measured state data to form a complete performance database.

[0040] Based on the complete performance database, a dynamic performance report can be output, which includes transient curves under sensitive working conditions and performance index limit values under boundary working conditions. After obtaining these data, it can be easily judged whether the actual performance of the side plate heat exchanger 300 designed meets the design requirements.

[0041] After using the system composition and process of the present application, the test working conditions that need to be actually executed by the side plate heat exchanger 300 can be reduced by 60%-70%, and the total test cost can be reduced by more than 50%.

[0042] Further, the test device comprises a hot side circulation branch and a cold side circulation branch, the hot side circulation branch comprises a hot side oil heater 201, a hot side valve 202 and a hot side flow meter 203, a hot side inlet temperature meter 204 and a hot side inlet pressure meter 205 are connected to the hot side inlet of the side plate heat exchanger 300, a hot side outlet temperature meter 206 and a hot side outlet pressure meter 207 are connected to the hot side outlet of the side plate heat exchanger 300, the cold side circulation branch comprises a cold side oil heater 210, a cold side valve 211 and a cold side flow meter 212, a cold side inlet temperature meter 213 and a cold side inlet pressure meter 214 are connected to the cold side inlet of the side plate heat exchanger 300, a cold side outlet temperature meter 215 and a cold side outlet pressure meter 216 are connected to the cold side outlet of the side plate heat exchanger 300.

[0043] In the embodiment of the present application, the cold side outlet of the side plate heat exchanger 300 is further connected to an auxiliary circulation branch, the auxiliary circulation branch comprises an auxiliary heat exchanger 220, an auxiliary valve 221 and an auxiliary water cooler 222.

[0044] Specifically, the hot side oil heater 201 is used to heat the hot side medium to the required temperature, and the cold side oil heater 210 is used to heat the cold side medium, since the temperature of the cold side medium is not easy to control in the process of cooling the cold side medium by the auxiliary water cooler 222, the auxiliary heat exchanger 220 is generally used to cool the cold side medium to below the required temperature, and then the cold side oil heater 210 is used to heat the cold side medium to the required temperature, so as to ensure the accuracy of the temperature of the cold side medium.

[0045] The embodiment of the present application also provides a side plate heat exchanger performance test method, comprising: constructing a digital twin model by using the physical data collected from the side plate heat exchanger 300; generating a plurality of groups of dynamic working condition data within a set working condition range, inputting the plurality of groups of dynamic working condition data into the digital twin model in the simulation software, and obtaining dynamic performance data of the digital twin model under each group of dynamic working condition data; calculating a sensitive coefficient of each dynamic performance data, screening the dynamic working condition data according to the sensitive coefficient, and obtaining sensitive working condition data; inputting the hot side medium and the cold side medium into the side plate heat exchanger 300 according to the sensitive working condition data by the test device, and collecting measured state data of the side plate heat exchanger 300 at the hot side inlet and outlet and the cold side inlet and outlet; judging whether the performance of the side plate heat exchanger 300 meets the design requirements according to the measured state data.

[0046] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure without departing from the spirit and scope of the application. Accordingly, it is intended that such additions and modifications be included within the scope of the application. It is the following claims, including any amendments thereto, which define the scope of the application.

[0047] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A side plate heat exchanger performance test system, characterized by, The application relates to a computer (100) for constructing a digital twin model by using physical data collected from a side plate heat exchanger (300), generating a plurality of groups of dynamic working condition data within a set working condition range, inputting the plurality of groups of dynamic working condition data into the digital twin model in simulation software, obtaining dynamic performance data of the digital twin model under each group of dynamic working condition data, calculating a sensitive coefficient of each dynamic performance data, screening the dynamic working condition data according to the sensitive coefficient, and obtaining sensitive working condition data. A test device is connected to hot side inlets and outlets and cold side inlets and outlets of the side plate heat exchanger (300), the test device inputs hot side medium and cold side medium into the side plate heat exchanger (300) according to the sensitive working condition data, and collects measured state data of the side plate heat exchanger (300) at the hot side inlets and outlets and the cold side inlets and outlets. The computer (100) judges whether the performance of the side plate heat exchanger (300) meets design requirements according to the measured state data. The physical data is collected by a three-dimensional scanning device, the three-dimensional scanning device is connected to the computer (100) through a data cable, the three-dimensional scanning device collects three-dimensional point clouds of the side plate heat exchanger by using a laser scanning technology, and the computer (100) extracts and analyzes the three-dimensional point clouds to obtain the physical data.

2. A side plate heat exchanger performance testing system according to claim 1, characterized in that: After the digital twin model is constructed, the computer (100) implants dynamic physical laws in the digital twin model, the dynamic physical laws include non-steady flow laws, heat transfer models and structural mechanics models.

3. The performance test system of a side plate heat exchanger according to claim 1, characterized in that, After the digital twin model is constructed, the computer (100) establishes an input-output mapping model, the input-output mapping model represents the mapping relationship between input medium and output medium in temperature, pressure drop and heat exchange capacity in the digital twin model.

4. The performance test system of a side plate heat exchanger according to claim 1, characterized in that, After the digital twin model is constructed, the computer (100) selects a plurality of groups of steady working condition data, after the test device executes the plurality of groups of steady working condition data on the side plate heat exchanger (300) and collects corresponding steady performance data, the computer (100) corrects model parameters in the digital twin model according to the steady performance data.

5. The performance test system of a side plate heat exchanger according to claim 1, characterized in that, After the test device executes the sensitive working condition data and collects the measured state data, the computer (100) predicts predicted state data corresponding to the sensitive working condition data based on the digital twin model, and corrects dynamic parameters of the digital twin model according to the difference between the measured state data and the predicted state data.

6. The performance test system of a side plate heat exchanger according to claim 1, wherein After the digital twin model is corrected, the computer (100) predicts predicted performance data corresponding to untested working condition data except the sensitive working condition data in the plurality of groups of dynamic working condition data by using the corrected digital twin model, and combines the predicted performance data and measured performance data corresponding to the measured state data to form a complete performance database.

7. A side plate heat exchanger performance testing system according to claim 6, characterized in that: ​ 8. The performance test system of a side plate heat exchanger according to claim 1, characterized in that, The test device comprises a hot side circulation branch and a cold side circulation branch, the hot side circulation branch comprises a hot side oil temperature machine (201), a hot side valve (202) and a hot side flow meter (203), a hot side inlet temperature meter (204) and a hot side inlet pressure meter (205) are connected to a hot side inlet of the side plate heat exchanger (300), a hot side outlet temperature meter (206) and a hot side outlet pressure meter (207) are connected to a hot side outlet of the side plate heat exchanger (300), the cold side circulation branch comprises a cold side oil temperature machine (210), a cold side valve (211) and a cold side flow meter (212), a cold side inlet temperature meter (213) and a cold side inlet pressure meter (214) are connected to a cold side inlet of the side plate heat exchanger (300), and a cold side outlet temperature meter (215) and a cold side outlet pressure meter (216) are connected to a cold side outlet of the side plate heat exchanger (300).

9. The performance test system of a side plate heat exchanger according to claim 8, characterized in that, The cold side outlet of the side plate heat exchanger (300) is further connected to an auxiliary circulation branch, and the auxiliary circulation branch comprises an auxiliary heat exchanger (220), an auxiliary valve (221) and an auxiliary water cooler (222).

10. A method applied to the performance test system of any one of claims 1-9, characterized in that, The method comprises the following steps: constructing a digital twin model by using physical data collected from the side plate heat exchanger (300); generating a plurality of groups of dynamic working condition data within a set working condition range, inputting the plurality of groups of dynamic working condition data into the digital twin model in simulation software, and obtaining dynamic performance data of the digital twin model under each group of dynamic working condition data; calculating a sensitive coefficient of each dynamic performance data, screening the dynamic working condition data according to the sensitive coefficient, and obtaining sensitive working condition data; inputting hot side medium and cold side medium into the side plate heat exchanger (300) according to the sensitive working condition data by using the test device, and collecting measured state data of the side plate heat exchanger (300) at hot side inlets and outlets and cold side inlets and outlets; judging whether the performance of the side plate heat exchanger (300) meets the design requirements according to the measured state data.

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