Heat exchanger performance testing method, system, terminal device and storage medium

Abstract

The present invention provides a heat exchanger performance testing method, system, terminal device and storage medium. The method includes: determining the total heat transfer area according to the core structure parameters, flat tube structure parameters and fin structure parameters; performing information correction on the operating condition information of the heat exchanger to be tested; determining the total heat transfer coefficient of the heat exchanger to be tested according to the corrected operating condition information, and determining the total heat transfer quantity of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area; generating a performance test result of the heat exchanger to be tested according to the total heat transfer quantity. According to the corrected operating condition information, the present invention can automatically determine the total heat transfer coefficient of the heat exchanger to be tested. Based on the total heat transfer coefficient and the total heat transfer area, the total heat transfer quantity of the heat exchanger to be tested can be automatically determined. For heat exchangers of different sizes or specifications, there is no need to manufacture sample parts for actual measurement, which improves the accuracy of heat exchanger performance testing.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a heat exchanger performance testing method, system, terminal device and storage medium. Background Art

[0002] With the improvement of production process technology level and equipment precision, the materials of vehicle heat exchangers have been greatly improved, from the previous steel heat exchangers and copper heat exchangers to the current widely used aluminum or aluminum alloy heat exchangers. Due to the very limited layout space of the current whole vehicle, especially for new energy sedans, how to accurately test the performance of heat exchangers in the early stage of automotive projects and within limited space has become a research topic for each vehicle manufacturer and heat exchanger component manufacturer.

[0003] In the existing heat exchanger performance testing process, generally, a heat exchanger sample is made for bench testing to obtain the performance data of the bench testing of the heat exchanger. For heat exchangers of different sizes, multiple heat exchanger samples need to be made for actual measurement, resulting in a high testing cost. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a heat exchanger performance testing method, system, terminal device and storage medium to solve the problem of high testing cost in the existing heat exchanger performance testing process.

[0005] The first aspect of the embodiments of the present invention provides a heat exchanger performance testing method, including:

[0006] Respectively obtain the core structure parameters, flat tube structure parameters and fin structure parameters in the heat exchanger to be tested, and determine the total heat transfer area according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, where the total heat transfer area includes the flat tube heat transfer area and the fin heat transfer area;

[0007] Obtain the operating condition information of the heat exchanger to be tested, and correct the operating condition information, where the operating condition information includes hot side fluid information and cold side fluid information;

[0008] According to the corrected operating condition information, determine the total heat transfer coefficient of the heat exchanger to be tested, and determine the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area;

[0009] Generate a performance test result of the heat exchanger to be tested according to the total heat transfer amount.

[0010] Further, after determining the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area, it further includes:

[0011] determining a hot-side fluid resistance and a cold-side fluid resistance according to the flat tube heat exchange area, the fin heat exchange area, and the operating condition information;

[0012] A heat exchange performance diagram of the heat exchanger to be tested is generated according to the hot-side fluid resistance, the cold-side fluid resistance and the total heat exchange amount.

[0013] Furthermore, the total heat exchange area is determined based on the core structure parameters, the flat tube structure parameters, and the fin structure parameters, and the formula used is:

[0014] If the cross section of the flat tube is circular, then:

[0015]

[0016] Among them, S t is the flat tube heat exchange area, N t is the total number of flat tubes in the heat exchanger to be tested, t d is the flat tube depth, t h is the height of the flat tube, t l is the length of the flat tube;

[0017] If the cross section of the flat tube is rectangular, then:

[0018] S t =N t *2*(t d +t h )*t l

[0019] n f =t l *d f

[0020] S f =(f l -d i *2+π*d i *2)*(n f +1)*N f *t f

[0021] Among them, S f is the heat transfer area of the fin, f l is the fin length, d i is the inner fillet of the fin, n f is the total number of fin waves, N f Total number of fins, t f is the fin depth, and the fin density is d f ;

[0022] S a =S t+S f

[0023] Among them, S a is the total heat transfer area mentioned above.

[0024] Furthermore, the formula used for correcting the operating condition information is:

[0025] ρ c = -0.00000002 * t1' 3 - 0.0024 * t1' 2 - 0.3386 * t1' + ρ b

[0026] Among them, ρ c is the density correction value of the cooling medium, t1' is the inlet temperature of the cooling medium, and ρ b is the density of the cooling medium under standard working conditions;

[0027]

[0028] Among them, ρ a is the density of the cold-side fluid, P a is the pressure, and t2' is the inlet temperature of the cold-side fluid.

[0029] Furthermore, the formula used for determining the total heat transfer coefficient of the heat exchanger to be measured according to the corrected operating condition information is:

[0030]

[0031] Among them, K is the total heat transfer coefficient, ha is the thermal conductivity of the air side of the heat exchanger to be measured, hc is the thermal conductivity of the cooling medium side, and Rr is the thermal resistance of the heat exchanger to be measured;

[0032]

[0033] Among them, λa is the air heat transfer coefficient, Re a is the Reynolds coefficient on the air side, Pr a is the Prandtl constant on the air side, la is the characteristic dimension of the heat transfer surface on the air side, λc is the heat transfer coefficient of the cooling medium, Re c is the Reynolds number of the cooling medium, Pr c is the Prandtl constant on the cooling medium side, lc is the characteristic dimension of the heat transfer surface of the cooling medium, and λ l is the heat transfer coefficient of the fin material, and Ds is the thickness of the heat exchange material.

[0034] Furthermore, the formula used for determining the total heat transfer amount of the heat exchanger to be measured according to the total heat transfer coefficient and the total heat transfer area is:

[0035] Q = KSaΔT1

[0036] Q = CmΔTc

[0037] Wherein, Q is the total heat transfer amount, ΔT1 is the logarithmic mean temperature difference, C is the specific heat capacity of the heat transfer medium, m is the mass flow rate of the heat transfer medium, and ΔTc is the mathematical temperature difference between the inlet and outlet of the heat transfer medium;

[0038] ΔT1 = [(t1″ - t2′) - (t1′ - t2″)] / ln[(t1″ - t2′) / (t1′ - t2″)]

[0039] ΔTc = t1′ - t1″

[0040] Wherein, T1′ is the inlet temperature of the hot-side fluid, T1″ is the outlet temperature of the hot-side fluid, T2′ is the inlet temperature of the cold-side fluid, and T2″ is the outlet temperature of the cold-side fluid.

[0041] Further, after determining the total heat transfer coefficient of the heat exchanger to be tested according to the corrected operating condition information, it further includes:

[0042] Obtain the target heat transfer amount of the heat exchanger to be tested, and determine the target heat transfer coefficient according to the target heat transfer amount and the operating condition information;

[0043] Perform fitting calculation on the total heat transfer coefficient and the target heat transfer coefficient to obtain a fitting degree;

[0044] If the fitting degree is less than the fitting threshold, an error prompt is given for the heat exchanger to be tested.

[0045] The second aspect of the embodiments of the present invention provides a heat exchanger performance testing system, including:

[0046] A heat transfer area determination module, configured to respectively obtain the core structure parameters, flat tube structure parameters, and fin structure parameters in the heat exchanger to be tested, and determine the total heat transfer area according to the core structure parameters, the flat tube structure parameters, and the fin structure parameters, where the total heat transfer area includes the flat tube heat transfer area and the fin heat transfer area;

[0047] An information correction module, configured to obtain the operating condition information of the heat exchanger to be tested and perform information correction on the operating condition information, where the operating condition information includes hot-side fluid information and cold-side fluid information;

[0048] A heat transfer amount determination module, configured to determine the total heat transfer coefficient of the heat exchanger to be tested according to the corrected operating condition information, and determine the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area;

[0049] A test result generation module, configured to generate a performance test result of the heat exchanger to be tested according to the total heat exchange amount.

[0050] A third aspect of the embodiments of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the terminal device. When the processor executes the computer program, the steps of the heat exchanger performance test method provided by the first solution are implemented.

[0051] A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, storing a computer program, and when the computer program is executed by a processor, the steps of the heat exchanger performance test method provided by the first solution are implemented.

[0052] The heat exchanger performance test method, system, terminal device, and storage medium provided by the embodiments of the present invention have the following beneficial effects: Through the core structure parameters, flat tube structure parameters, and fin structure parameters, the total heat exchange area of the heat exchanger to be tested can be automatically determined. By correcting the operating condition information, the fluid information under different environmental temperatures and pressures can be automatically corrected, improving the accuracy of the heat exchanger performance test. According to the corrected operating condition information, the total heat transfer coefficient of the heat exchanger to be tested can be automatically determined. Based on the total heat transfer coefficient and the total heat exchange area, the total heat exchange amount of the heat exchanger to be tested can be automatically determined. For heat exchangers of different sizes or specifications, there is no need to manufacture samples for actual measurement, improving the accuracy of the heat exchanger performance test. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0054] Figure 1 is a flowchart of the implementation of a heat exchanger performance test method provided by the embodiments of the present invention;

[0055] Figure 2 is a schematic diagram of a heat transfer performance chart provided by the embodiments of the present invention;

[0056] Figure 3 is a schematic diagram of a heat dissipation - cooling medium flow rate performance chart provided by the embodiments of the present invention;

[0057] Figure 4 is a schematic diagram of a heat dissipation - wind speed performance chart provided by the embodiments of the present invention;

[0058] Figure 5 It is a schematic diagram of the calculation process of the heat exchanger performance test method provided by an embodiment of the present invention;

[0059] Figure 6 It is a flowchart of the implementation of a heat exchanger performance test method provided by another embodiment of the present invention;

[0060] Figure 7 It is a schematic diagram of the calculation process of the heat exchanger performance test method provided by another embodiment of the present invention;

[0061] Figure 8 It is a structural block diagram of a heat exchanger performance test system provided by an embodiment of the present invention;

[0062] Figure 9 It is a structural block diagram of a terminal device provided by an embodiment of the present invention. Detailed implementation manners

[0063] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0064] Please refer to Figure 1 , Figure 1 which shows a flowchart of the implementation of a heat exchanger performance test method provided by an embodiment of the present invention, including:

[0065] Step S10, respectively obtain the core structure parameters, flat tube structure parameters and fin structure parameters in the heat exchanger to be tested, and determine the total heat transfer area according to the core structure parameters, the flat tube structure parameters and the fin structure parameters;

[0066] Among them, the total heat transfer area includes the flat tube heat transfer area and the fin heat transfer area. The core structure parameters include the core size width w * height h * thickness t, and the flat tube structure parameters include the cross-sectional size height t h * depth t d , material thickness δ t , number of flat tube rows n t , the number of flat tube rows is usually 1 row or 2 rows, and the gap d between the flat tubes t .

[0067] Optionally, in this step, the formula used to determine the total heat transfer area according to the core structure parameters, the flat tube structure parameters and the fin structure parameters is:

[0068] If the cross-section of the flat tube is circular, then:

[0069]

[0070] Among them, S t is the flat tube heat transfer area, N t is the total number of flat tubes in the heat exchanger to be measured, t d is the depth of the flat tube, t h is the height of the flat tube, t l is the length of the flat tube;

[0071] If the cross-section of the flat tube is rectangular, then:

[0072] S t = N t * 2 * (t d + t h ) * t l

[0073] n f = t l * d f

[0074] S f = (f l - d i * 2 + π * d i * 2) * (n f + 1) * N f * t f

[0075]

[0076] Among them, S f is the fin heat transfer area, f l is the fin length, d i is the inner fillet of the fin, n f is the total number of fin waves, N f total number of fins, t f is the fin depth, δ f is the thickness of the fin, and the fin density is d f , usually t f = t d ;

[0077] S a = S t + S f

[0078] Among them, S a is the total heat transfer area.

[0079] Step S20, obtain the operating condition information of the heat exchanger to be measured, and correct the operating condition information;

[0080] Among them, the operating condition information includes hot-side fluid information and cold-side fluid information. The hot-side fluid information includes the type, density, parameter information of the hot-side fluid, and the inlet temperature of the hot-side fluid. The hot-side fluid includes one or a combination of more than one of antifreeze, engine oil, or transmission oil, etc. The cold-side fluid includes, for example, air or refrigerant, etc. The cold-side fluid information further includes the flow rate V c , the inlet temperature t2' of the cold-side fluid;

[0081] In this step, due to the differences in the performance of the heat exchanger under the temperatures of different cooling media and the ambient temperature, therefore, by correcting the operating condition information, physical information such as density under different ambient temperatures and pressures can be automatically corrected, thereby improving the accuracy of the heat exchanger performance test.

[0082] Optionally, in this step, the formula used for correcting the operating condition information is:

[0083] ρ c =-0.00000002*t1' 3 -0.0024*t1' 2 -0.3386*t1'+ρ b

[0084] Among them, ρ c is the density correction value of the cooling medium, t1' is the inlet temperature of the cooling medium, and ρ b is the density of the cooling medium under standard working conditions;

[0085]

[0086] Among them, ρ a is the density of the cold-side fluid, P a is the pressure, and t2' is the inlet temperature of the cold-side fluid.

[0087] Step S30, determine the total heat transfer coefficient of the heat exchanger to be tested according to the corrected operating condition information, and determine the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area;

[0088] Among them, according to the corrected operating condition information, the total heat transfer coefficient of the heat exchanger to be tested can be automatically determined. Based on the total heat transfer coefficient and the total heat transfer area, the total heat transfer amount of the heat exchanger to be tested can be automatically determined. For heat exchangers of different sizes or specifications, there is no need to manufacture samples for actual measurement, which improves the accuracy of the heat exchanger performance test;

[0089] Optionally, after determining the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area in this step, it further includes:

[0090] Determine the hot-side fluid resistance and the cold-side fluid resistance according to the flat-tube heat transfer area, the fin heat transfer area, and the operating condition information;

[0091] Generate a heat transfer performance graph of the heat exchanger to be tested according to the hot-side fluid resistance, the cold-side fluid resistance, and the total heat transfer amount;

[0092] Among them, please refer to Figures 2 to 5 , in this step, the heat transfer performance graph includes a heat transfer performance chart, a heat dissipation-cooling medium flow performance graph, and a heat dissipation-wind speed performance graph. The heat transfer performance chart intuitively shows the heat transfer efficiency range of the heat exchanger to be tested. By generating the heat transfer performance graph, it effectively facilitates the user to view the performance of the heat exchanger to be tested.

[0093] Optionally, in this step, the calculation formula used for determining the hot-side fluid resistance and the cold-side fluid resistance according to the flat-tube heat transfer area, the fin heat transfer area, and the operating condition information is as follows:

[0094] Ra = ∑R i

[0095] Among them, Ra is the total resistance, and R i is the fluid resistance of each section;

[0096] In this embodiment, the flow is considered as the flow between the tubes. The calculation formula for the frictional resistance along the tube is as follows:

[0097] R′ = Ks * q 2

[0098]

[0099] Among them, R′ is the frictional resistance, Ks is the frictional resistance coefficient, q is the fluid flow rate, λ is the frictional resistance coefficient, L is the tube length, g is the acceleration due to gravity, and d is the effective diameter;

[0100]

[0101] At is the flow cross-sectional area, and Pt is the wetted perimeter. Both the flow cross-sectional area and the wetted perimeter can be calculated from the structural dimensions of the flat tube and the fins:

[0102] At = (t d - 2δ t ) * (t h - 2δ t )

[0103] Pt = (t d - 2δ t ) + (t h - 2δ t )

[0104] Among them, δ t is the material thickness of the flat tube.

[0105] Furthermore, in this step, according to the corrected operating condition information, determine the

[0106] total heat transfer coefficient of the heat exchanger to be measured, and the formula used is:

[0107]

[0108] Among them, K is the total heat transfer coefficient, ha is the air-side thermal conductivity of the heat exchanger to be measured, hc is the thermal conductivity of the cooling medium side, and Rr is the thermal resistance of the heat exchanger to be measured;

[0109]

[0110] Among them, λa is the air heat transfer coefficient, Re a is the air-side Reynolds number, Pr a is the Prandtl constant on the air side, la is the characteristic dimension of the heat transfer surface on the air side, which can be the pipe diameter (inner diameter, outer diameter or average diameter) or the flat plate length, etc., λc is the heat transfer coefficient of the cooling medium, Re c is the Reynolds number of the cooling medium, Pr c is the Prandtl constant on the cooling medium side, lc is the characteristic dimension of the cooling medium heat transfer surface, which can be the pipe diameter (inner diameter, outer diameter or average diameter) or the flat plate length, etc., λ l is the heat transfer coefficient of the fin material, and Ds is the thickness of the heat exchange material.

[0111] The Reynolds number is an important parameter characterizing the fluid flow characteristics, and its calculation formula is as follows

[0112]

[0113] Among them, Re represents the Reynolds number of the fluid, v is the viscosity, which is a physical parameter of the fluid medium and is a constant, l is the defined dimension. For the flow inside the pipe, l = t d , and u is the average velocity of the fluid, which can be obtained by converting the input flow rate.

[0114] Even further, in this step, according to the total heat transfer coefficient and the total heat transfer area, determine the total heat transfer amount of the heat exchanger to be measured, and the formula used is:

[0115] Q = KSaΔT1

[0116] Q = CmΔTc

[0117] Among them, Q is the total heat transfer amount, ΔT1 is the logarithmic mean temperature difference, C is the specific heat capacity of the heat transfer medium, m is the mass flow rate of the heat transfer medium, and ΔTc is the mathematical temperature difference between the inlet and outlet of the heat transfer medium;

[0118] ΔT1 = [(t1″ - t2′) - (t1′ - t2″)] / ln[(t1″ - t2′) / (t1′ - t2″)]

[0119] ΔTc = t1′ - t1″

[0120] Wherein, t1′ is the inlet temperature of the hot-side fluid, t1″ is the outlet temperature of the hot-side fluid, t2′ is the inlet temperature of the cold-side fluid, and t2″ is the outlet temperature of the cold-side fluid. In this step, t1′ and t2′ are generally stored in the operating condition information, that is, they are known parameters. According to the above formula, t1″ and t2″ can be calculated from t1′ and t2′, and then the logarithmic mean temperature difference can be calculated from t1″ and t2″.

[0121] Step S40, generate a performance test result of the heat exchanger to be tested according to the total heat transfer amount;

[0122] Wherein, obtain an expected value of the heat transfer amount of the heat exchanger to be tested, and numerically compare the total heat transfer amount with the expected value of the heat transfer amount to obtain the performance test result. When the ratio of the total heat transfer amount to the expected value of the heat transfer amount is greater than or equal to the first threshold, it is determined that the performance test result of the heat exchanger to be tested is excellent. When the ratio of the total heat transfer amount to the expected value of the heat transfer amount is greater than the second threshold and less than the first threshold, it is determined that the performance test result of the heat exchanger to be tested is medium. When the ratio of the total heat transfer amount to the expected value of the heat transfer amount is less than or equal to the second threshold, it is determined that the performance test result of the heat exchanger to be tested is poor. Both the first threshold and the second threshold can be set according to user requirements.

[0123] Specifically, in this step, please refer to Figure 5 , which is a schematic diagram of the calculation process of the heat exchanger performance test method provided by the embodiment. Among them, the core structure parameters in the heat exchanger to be tested are obtained through step 1001, the flat tube structure parameters are obtained through step 1002, the fin structure parameters are obtained through step 1003, the operating condition information of the heat exchanger to be tested is obtained through step 1004, the flat tube heat transfer area is calculated through step 1005, the fin heat transfer area is calculated through step 1006, the total heat transfer coefficient is calculated through step 1007, the total heat transfer amount of the heat exchanger to be tested is calculated through step 1009, the hot-side fluid resistance and the cold-side fluid resistance are calculated through 1008, the heat transfer performance chart is generated through step 1010, and the heat dissipation-cooling medium flow performance chart and the heat dissipation-wind speed performance chart are generated through 1011.

[0124] In this embodiment, through the core structure parameters, flat tube structure parameters, and fin structure parameters, the total heat transfer area of the heat exchanger to be tested can be automatically determined. By correcting the operating condition information, the fluid information under different environmental temperatures and pressures can be automatically corrected, improving the accuracy of the heat exchanger performance test. According to the corrected operating condition information, the total heat transfer coefficient of the heat exchanger to be tested can be automatically determined. Based on the total heat transfer coefficient and the total heat transfer area, the total heat transfer amount of the heat exchanger to be tested can be automatically determined. For heat exchangers of different sizes or specifications, there is no need to manufacture sample parts for actual measurement, improving the accuracy of the heat exchanger performance test.

[0125] Please refer to Figure 6 , Figure 6 which is the implementation flowchart of a heat exchanger performance test method provided by another embodiment of the present invention. Compared with Figure 1 the Figure 1 embodiment, the heat exchanger performance test method provided in this embodiment is used to further refine step S30 in the

[0126] embodiment, including:

[0127] Step S50, obtaining the target heat transfer amount of the heat exchanger to be tested, and determining the target heat transfer coefficient according to the target heat transfer amount and the operating condition information;

[0128] Q o = ε * Cmin * (t1′ - t2′)

[0129] where Q o is the input target heat transfer amount, ε is the heat transfer effectiveness, C is the equivalent number, t1′ is the hot fluid inlet temperature, and t2′ is the cold fluid inlet temperature.

[0130]

[0131] where is the specific heat capacity, m is the fluid mass flow, and due to the difference in fluids between the hot side fluid and the cooling fluid, the equivalent numbers are different;

[0132]

[0133] where ε is the heat transfer effectiveness, Cmin is the minimum equivalent number, Cmax is the maximum equivalent number, and the actual value is the value of the equivalent numbers of the hot side fluid and the cold side fluid;

[0134]

[0135] where Ko is the target heat transfer coefficient, Sa is the total heat transfer area, and NTU is the number of heat transfer units.

[0136] Step S60: Perform fitting calculation on the total heat transfer coefficient and the target heat transfer coefficient to obtain a fitting degree;

[0137] wherein, the fitting degree is used to characterize the similarity between the total heat transfer coefficient and the target heat transfer coefficient;

[0138] Step S70: If the fitting degree is less than the fitting threshold, give an error prompt for the heat exchanger to be tested;

[0139] wherein, the fitting threshold can be set according to requirements. For example, the fitting threshold can be set to values such as 99%, 98%, or 98.5%. In this step, if the fitting degree is less than the fitting threshold, it is determined that there is an error in the size design of the heat exchanger to be tested. Therefore, an error prompt is given for the heat exchanger to be tested to prompt the user to adjust the size parameters of the heat exchanger to be tested.

[0140] Specifically, in this embodiment, please refer to Figure 7 , obtain the target heat transfer amount of the heat exchanger to be tested through step 2001, calculate the target heat transfer coefficient through step 2002, compare the size between the fitting degree and the fitting threshold through step 2003, and when it is determined that the fitting degree is less than the fitting threshold, execute step 2004.

[0141] In this embodiment, by obtaining the target heat transfer amount of the heat exchanger to be tested, based on the target heat transfer amount and the operating condition information, the target heat transfer coefficient can be automatically calculated. By performing fitting calculation on the total heat transfer coefficient and the target heat transfer coefficient, the fitting degree is obtained. Based on the comparison of the size between the fitting degree and the fitting threshold, the size design of the heat exchanger to be tested can be effectively detected, improving the accuracy of the heat exchanger performance test.

[0142] Please refer to Figure 8 , Figure 8 is a structural block diagram of a heat exchanger performance test system 100 provided by an embodiment of the present invention. In this embodiment, each unit included in the heat exchanger performance test system 100 is used to execute Figure 1 , Figure 6 the respective steps in the corresponding embodiments. Specifically, please refer to Figure 1 , Figure 6 and Figure 1 , Figure 6 the relevant descriptions in the corresponding embodiments. For the sake of convenience of description, only the parts related to this embodiment are shown. See Figure 8 , the heat exchanger performance test system 100 includes: a heat transfer area determination module 10, an information correction module 11, a heat transfer amount determination module 12, and a test result generation module 13, wherein:

[0143] The heat exchange area determination module 10 is configured to respectively obtain the core structure parameters, flat tube structure parameters, and fin structure parameters in the heat exchanger to be measured, and determine the total heat exchange area according to the core structure parameters, the flat tube structure parameters, and the fin structure parameters. The total heat exchange area includes the flat tube heat exchange area and the fin heat exchange area. Among them, the total heat exchange area includes the flat tube heat exchange area and the fin heat exchange area. The core structure parameters include the core size width w * height h * thickness t, and the flat tube structure parameters include the cross-sectional size height t h * depth t d , material thickness δ t , number of flat tube rows n t , the number of flat tube rows is usually 1 row or 2 rows, and the gap d between the flat tubes t .

[0144] Optionally, the formula used to determine the total heat exchange area according to the core structure parameters, the flat tube structure parameters, and the fin structure parameters is:

[0145] If the cross-section of the flat tube is circular, then:

[0146]

[0147] Among them, S t is the flat tube heat exchange area, N t is the total number of flat tubes in the heat exchanger to be measured, t d is the flat tube depth, t h is the flat tube height, t l is the flat tube length;

[0148] If the cross-section of the flat tube is rectangular, then:

[0149] S t = N t * 2 * (t d + t h ) * t l

[0150] n f = t l * d f

[0151] S f = (f l - d i * 2 + π * d i * 2) * (n f + 1) * N f * t f

[0152] Among them, S f is the fin heat exchange area, f lis the fin length, d i is the inner fillet of the fin, n f is the total number of fin waves, N f Total number of fins, t f is the fin depth, and the fin density is d f ;

[0153] S a =S t +S f

[0154] Among them, S a is the total heat exchange area.

[0155] The information correction module 11 is used to obtain the operating condition information of the heat exchanger to be tested and to correct the operating condition information. The operating condition information includes hot side fluid information and cold side fluid information. The hot side fluid information includes the type, density, parameter information and inlet temperature of the hot side fluid. The hot side fluid includes one or more combinations of antifreeze, engine oil or transmission oil. The cold side fluid includes air or refrigerant. The cold side fluid information also includes the flow rate V of the cold side fluid. c , the inlet temperature t2′ of the cold-side fluid. In this module, since the performance of the heat exchanger varies under different cooling medium temperatures and ambient temperatures, this module automatically corrects physical information such as density under different ambient temperatures and pressures by correcting the operating condition information, thereby improving the accuracy of the heat exchanger performance test.

[0156] Optionally, the information correction for the operating condition information is performed using the following formula:

[0157] ρ c =-0.00000002*t1′ 3 -0.0024*t1′ 2 -0.3386*t1′+ρ b

[0158] Among them, ρ c is the density correction value of the cooling medium, t1′ is the cooling medium inlet temperature, ρ b is the density of the cooling medium under standard working conditions;

[0159]

[0160] Among them, ρ a is the cold side fluid density, P a is the pressure, and t2′ is the inlet temperature of the cold side fluid.

[0161] The heat transfer amount determination module 12 is configured to determine the overall heat transfer coefficient of the heat exchanger to be measured according to the corrected operating condition information, and determine the total heat transfer amount of the heat exchanger to be measured according to the overall heat transfer coefficient and the total heat transfer area. Among them, according to the corrected operating condition information, the overall heat transfer coefficient of the heat exchanger to be measured can be automatically determined. Based on the overall heat transfer coefficient and the total heat transfer area, the total heat transfer amount of the heat exchanger to be measured can be automatically determined. For heat exchangers of different sizes or specifications, it is not necessary to manufacture a sample for actual measurement, which improves the accuracy of heat exchanger performance testing.

[0162] Optionally, the heat transfer amount determination module 12 is further configured to: determine the hot-side fluid resistance and the cold-side fluid resistance according to the flat tube heat transfer area, the fin heat transfer area and the operating condition information;

[0163] Generate a heat transfer performance graph of the heat exchanger to be measured according to the hot-side fluid resistance, the cold-side fluid resistance and the total heat transfer amount.

[0164] Furthermore, the formula used to determine the overall heat transfer coefficient of the heat exchanger to be measured according to the corrected operating condition information is:

[0165]

[0166] Wherein, K is the overall heat transfer coefficient, ha is the air-side thermal conductivity of the heat exchanger to be measured, hc is the thermal conductivity of the cooling medium side, and Rr is the thermal resistance of the heat exchanger to be measured;

[0167]

[0168] Wherein, λa is the air heat transfer coefficient, Re a is the air-side Reynolds number, Pr a is the Prandtl constant on the air side, la is the characteristic dimension of the heat transfer surface on the air side, λc is the heat transfer coefficient of the cooling medium, Re c is the Reynolds number of the cooling medium, Pr c is the Prandtl constant on the cooling medium side, lc is the characteristic dimension of the cooling medium heat transfer surface, λ l is the heat transfer coefficient of the fin material, and Ds is the thickness of the heat transfer material.

[0169] Even further, the formula used to determine the total heat transfer amount of the heat exchanger to be measured according to the overall heat transfer coefficient and the total heat transfer area is:

[0170] Q = KSaΔT1

[0171] Q = CmΔTc

[0172] Among them, Q is the total heat transfer amount, ΔT1 is the logarithmic mean temperature difference, C is the specific heat capacity of the heat transfer medium, m is the mass flow rate of the heat transfer medium, and ΔTc is the mathematical temperature difference between the inlet and outlet of the heat transfer medium;

[0173] ΔT1 = [(t1″ - t2′) - (t1′ - t2″)] / ln[(t1″ - t2′) / (t1′ - t2″)]

[0174] ΔTc = t1′ - t1″

[0175] Among them, t1′ is the inlet temperature of the hot-side fluid, t1″ is the outlet temperature of the hot-side fluid, t2′ is the inlet temperature of the cold-side fluid, and t2″ is the outlet temperature of the cold-side fluid.

[0176] The test result generation module 13 is used to generate the performance test result of the heat exchanger to be tested according to the total heat transfer amount. Among them, the expected heat transfer amount of the heat exchanger to be tested is obtained, and the total heat transfer amount is numerically compared with the expected heat transfer amount to obtain the performance test result. When the ratio of the total heat transfer amount to the expected heat transfer amount is greater than or equal to the first threshold, it is determined that the performance test result of the heat exchanger to be tested is excellent. When the ratio of the total heat transfer amount to the expected heat transfer amount is greater than the second threshold and less than the first threshold, it is determined that the performance test result of the heat exchanger to be tested is medium. When the ratio of the total heat transfer amount to the expected heat transfer amount is less than or equal to the second threshold, it is determined that the performance test result of the heat exchanger to be tested is poor. Both the first threshold and the second threshold can be set according to user requirements.

[0177] Optionally, the test result generation module 13 is further used to: obtain the target heat transfer amount of the heat exchanger to be tested, and determine the target heat transfer coefficient according to the target heat transfer amount and the operating condition information;

[0178] Perform fitting calculation on the total heat transfer coefficient and the target heat transfer coefficient to obtain the fitting degree;

[0179] If the fitting degree is less than the fitting threshold, an error prompt is given for the heat exchanger to be tested.

[0180] In this embodiment, through the core structure parameters, flat tube structure parameters, and fin structure parameters, the total heat transfer area of the heat exchanger to be tested can be automatically determined. By correcting the operating condition information, the fluid information under different environmental temperatures and pressures can be automatically corrected, improving the accuracy of the heat exchanger performance test. According to the corrected operating condition information, the total heat transfer coefficient of the heat exchanger to be tested can be automatically determined. Based on the total heat transfer coefficient and the total heat transfer area, the total heat transfer amount of the heat exchanger to be tested can be automatically determined. For heat exchangers of different sizes or specifications, there is no need to make samples for actual measurement, improving the accuracy of the heat exchanger performance test.

[0181] Figure 9It is a block diagram of a terminal device 2 provided by another embodiment of the present invention. As Figure 9 shown, the terminal device 2 of this embodiment includes: a processor 20, a memory 21, and a computer program 22 stored in the memory 21 and executable on the processor 20, such as a program for the heat exchanger performance test method. When the processor 20 executes the computer program 22, it implements the steps in each embodiment of the above-mentioned various heat exchanger performance test methods, such as Figure 1 S10 to S40 shown, or Figure 6 S50 to S70 shown. Alternatively, when the processor 20 executes the computer program 22, it implements the functions of each module in the above-mentioned Figure 6 corresponding embodiments. For example, Figure 8 the functions of modules 10 to 13 shown. For specific details, please refer to the relevant descriptions in the Figure 6 corresponding embodiments, which will not be elaborated here.

[0182] Exemplarily, the computer program 22 can be divided into one or more units. The one or more units are stored in the memory 21 and executed by the processor 20 to complete the present invention. The one or more units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 22 in the terminal device 2. For example, the computer program 22 can be divided into a heat exchange area determination module 10, an information correction module 11, a heat exchange amount determination module 12, and a test result generation module 13, and the specific functions of each module are as described above.

[0183] The terminal device may include, but is not limited to, a processor 20 and a memory 21. Those skilled in the art can understand that Figure 9 this is only an example of the terminal device 2 and does not constitute a limitation on the terminal device 2. It may include more or fewer components than shown in the figure, or combine some components, or different components. For example, the terminal device may further include input / output devices, network access devices, a bus, etc.

[0184] The so-called processor 20 may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0185] The memory 21 may be an internal storage unit of the terminal device 2, such as the hard disk or memory of the terminal device 2. The memory 21 may also be an external storage device of the terminal device 2, such as a plug-in hard disk equipped on the terminal device 2, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. Further, the memory 21 may also include both the internal storage unit and the external storage device of the terminal device 2. The memory 21 is used to store the computer program and other programs and data required by the terminal device. The memory 21 may also be used to temporarily store the data that has been output or will be output.

[0186] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, it can implement:

[0187] Respectively obtain the core structure parameters, flat tube structure parameters, and fin structure parameters in the heat exchanger to be measured, and determine the total heat transfer area according to the core structure parameters, the flat tube structure parameters, and the fin structure parameters, where the total heat transfer area includes the flat tube heat transfer area and the fin heat transfer area;

[0188] Obtain the operating condition information of the heat exchanger to be measured and correct the operating condition information, where the operating condition information includes hot-side fluid information and cold-side fluid information;

[0189] Determine the total heat transfer coefficient of the heat exchanger to be measured according to the corrected operating condition information, and determine the total heat transfer amount of the heat exchanger to be measured according to the total heat transfer coefficient and the total heat transfer area;

[0190] Generate a performance test result of the heat exchanger to be measured according to the total heat transfer amount.

[0191] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for testing the performance of a heat exchanger, characterized in that, Including: Respectively obtain the core structure parameters, flat tube structure parameters, and fin structure parameters in the heat exchanger to be tested, and determine the total heat transfer area according to the core structure parameters, the flat tube structure parameters, and the fin structure parameters. The total heat transfer area includes the flat tube heat transfer area and the fin heat transfer area; Obtain the operating condition information of the heat exchanger to be tested and correct the operating condition information. The operating condition information includes hot side fluid information and cold side fluid information; Determine the total heat transfer coefficient of the heat exchanger to be tested according to the corrected operating condition information, and determine the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area; Generate a performance test result of the heat exchanger to be tested according to the total heat transfer amount; Wherein, the formula used for correcting the operating condition information is: ρ c = -0.00000002 * t1' 3 -0.0024 * t1' 2 -0.3386 * t1' + ρ b where ρ c is the density correction value of the cooling medium, t1' is the inlet temperature of the cooling medium, and ρ b is the density of the cooling medium under standard conditions; where ρ a is the density of the cold-side fluid, P a is the pressure, and t2 ′ is the inlet temperature of the cold-side fluid.

2. The heat exchanger performance test method according to claim 1, characterized in that, After determining the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area, it further includes: Determine the hot side fluid resistance and the cold side fluid resistance according to the flat tube heat transfer area, the fin heat transfer area, and the operating condition information; Generate a heat transfer performance diagram of the heat exchanger to be tested according to the hot side fluid resistance, the cold side fluid resistance, and the total heat transfer amount.

3. The heat exchanger performance testing method according to claim 1, characterized in that The formula used for determining the total heat transfer area according to the core structure parameters, the flat tube structure parameters, and the fin structure parameters is: If the cross-section of the flat tube is circular, then: Among them, S t is the flat tube heat transfer area, N t is the total number of flat tubes in the heat exchanger to be measured, t d is the depth of the flat tube, t h is the height of the flat tube, t l is the length of the flat tube; If the cross-section of the flat tube is rectangular, then: S t = N t * 2 * (t d + t h ) * t l n f = t l * d f S f = (f l - d i * 2 + π * d i * 2) * (n f + 1) * N f * t f Among them, S f is the fin heat transfer area, f l is the fin length, d i is the inner fillet of the fin, n f is the total number of fin waves, N f is the total number of fins, t f is the fin depth, and the fin density is d f ; S a = s t + S f Among them, S a is the total heat exchange area.

4. The heat exchanger performance testing method according to claim 1, characterized in that The formula used for determining the total heat transfer coefficient of the heat exchanger to be tested according to the corrected operating condition information is: Wherein, K is the total heat transfer coefficient, ha is the air-side thermal conductivity of the heat exchanger to be tested, hc is the thermal conductivity of the cooling medium side, and Rr is the thermal resistance of the heat exchanger to be tested; Among them, λa is the air heat transfer coefficient, Re a is the Reynolds number on the air side, Pr a is the Prandtl constant on the air side, la is the characteristic dimension of the heat transfer surface on the air side, λc is the heat transfer coefficient of the cooling medium, Re c is the Reynolds number of the cooling medium, Pr c is the Prandtl constant on the cooling medium side, lc is the characteristic dimension of the heat transfer surface of the cooling medium, λ l is the heat transfer coefficient of the fin material, and Ds is the thickness of the heat exchange material.

5. The heat exchanger performance test method according to claim 4, characterized in that The formula used for determining the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat transfer area is: Q = KS a ΔT1 Q = CmΔTc Wherein, Q is the total heat transfer amount, ΔT1 is the logarithmic mean temperature difference, C is the specific heat capacity of the heat transfer medium, m is the mass flow rate of the heat transfer medium, and ΔTc is the mathematical temperature difference between the inlet and outlet of the heat transfer medium; ΔT1 = [(t1″ - t2′) - (t1′ - t2″)] / ln[(t1″ - t2′) / (t1′ - t2″)] ΔTc = t1′ - t1″ Wherein, t1′ is the inlet temperature of the hot side fluid, t1″ is the outlet temperature of the hot side fluid, t2′ is the inlet temperature of the cold side fluid, and t2″ is the outlet temperature of the cold side fluid.

6. The heat exchanger performance testing method according to any one of claims 1 to 5, characterized in that After determining the total heat transfer coefficient of the heat exchanger to be tested according to the corrected operating condition information, it further includes: Obtain the target heat transfer amount of the heat exchanger to be tested and determine the target heat transfer coefficient according to the target heat transfer amount and the operating condition information; Perform a fitting calculation on the total heat transfer coefficient and the target heat transfer coefficient to obtain a fitting degree; If the fitting degree is less than the fitting threshold, an error prompt is given for the heat exchanger to be tested.

7. A heat exchanger performance test system, characterized in that, For implementing the heat exchanger performance test method described in claim 1, including: The heat exchange area determination module is configured to respectively obtain the core structure parameters, flat tube structure parameters, and fin structure parameters in the heat exchanger to be tested, and determine the total heat exchange area according to the core structure parameters, the flat tube structure parameters, and the fin structure parameters, where the total heat exchange area includes the flat tube heat exchange area and the fin heat exchange area; The information correction module is configured to obtain the operating condition information of the heat exchanger to be tested and correct the operating condition information, where the operating condition information includes the hot side fluid information and the cold side fluid information; The heat transfer amount determination module is configured to determine the total heat transfer coefficient of the heat exchanger to be tested according to the corrected operating condition information, and determine the total heat transfer amount of the heat exchanger to be tested according to the total heat transfer coefficient and the total heat exchange area; The test result generation module is configured to generate the performance test result of the heat exchanger to be tested according to the total heat transfer amount.

8. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method according to any one of claims 1 to 6.

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