CN114781283A - Heat exchanger performance testing method and system, terminal equipment and storage medium - Google Patents

Heat exchanger performance testing method and system, terminal equipment and storage medium Download PDF

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CN114781283A
CN114781283A CN202210391642.3A CN202210391642A CN114781283A CN 114781283 A CN114781283 A CN 114781283A CN 202210391642 A CN202210391642 A CN 202210391642A CN 114781283 A CN114781283 A CN 114781283A
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朱金华
杨晓荣
聂晓龙
易忠新
余春丛
王强
杨国伟
胡文
邓俊龙
喻文亮
王�泓
郭晓冬
李珊珊
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Jiangling Motors Corp Ltd
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Abstract

The invention provides a heat exchanger performance test method, a system, terminal equipment and a storage medium, wherein the method comprises the following steps: determining the total heat exchange area according to the core body structure parameters, the flat tube structure parameters and the fin structure parameters; performing information correction on the running condition information of the heat exchanger to be detected; determining the total heat exchange coefficient of the heat exchanger to be detected according to the corrected running condition information, and determining the total heat exchange quantity of the heat exchanger to be detected according to the total heat exchange coefficient and the total heat exchange area; and generating a performance test result of the heat exchanger to be tested according to the total heat exchange quantity. The invention can automatically determine the total heat exchange coefficient of the heat exchanger to be tested according to the corrected running condition information, can automatically determine the total heat exchange quantity of the heat exchanger to be tested based on the total heat exchange coefficient and the total heat exchange area, does not need to manufacture sample pieces for actual measurement aiming at the heat exchangers with different sizes or specifications, and improves the accuracy of the performance test of the heat exchanger.

Description

Heat exchanger performance testing method and system, terminal equipment and storage medium
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a heat exchanger performance testing method, a heat exchanger performance testing system, terminal equipment and a storage medium.
Background
With the improvement of the technical level of the production process and the precision of equipment, the material of the heat exchanger for the vehicle is greatly improved from the prior steel heat exchanger and copper heat exchanger to the aluminum or aluminum alloy heat exchanger which is used on a large scale at present. Because the arrangement space of the whole automobile is very limited at present, particularly, the performance of the heat exchanger is accurately tested in the early stage of an automobile project and the limited space, which becomes a subject of research of various host factories and heat exchanger part manufacturers.
In the existing heat exchanger performance test process, a heat exchanger sample piece is generally made to perform bench test, so that performance data of the bench test of the heat exchanger are obtained, and aiming at heat exchangers of different sizes, a plurality of heat exchanger sample pieces need to be made to perform actual measurement, so that the test cost is higher.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a system, a terminal device, and a storage medium for testing heat exchanger performance, so as to solve the problem of high test cost in the existing heat exchanger performance test process.
The first aspect of the embodiment of the invention provides a heat exchanger performance testing method, which comprises the following steps:
respectively obtaining core structure parameters, flat tube structure parameters and fin structure parameters in a heat exchanger to be tested, and determining a total heat exchange area according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, wherein the total heat exchange area comprises a flat tube heat exchange area and a fin heat exchange area;
acquiring running condition information of the heat exchanger to be tested, and performing information correction on the running condition information, wherein the running condition information comprises hot side fluid information and cold side fluid information;
determining the total heat exchange coefficient of the heat exchanger to be detected according to the corrected running condition information, and determining the total heat exchange quantity of the heat exchanger to be detected according to the total heat exchange coefficient and the total heat exchange area;
and generating a performance test result of the heat exchanger to be tested according to the total heat exchange amount.
Further, after determining the total heat exchange amount of the heat exchanger to be tested according to the total heat exchange coefficient and the total heat exchange area, the method further includes:
determining hot side fluid resistance and cold side fluid resistance according to the heat exchange area of the flat pipes, the heat exchange area of the fins and the operation condition information;
and generating a heat exchange 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 exchange amount.
Further, the total heat exchange area is determined according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, and the formula is as follows:
if the cross section of the flat pipe is circular, then:
Figure BDA0003597176250000021
wherein S istFor the heat exchange area of the flat tubes, NtTotal number of flat tubes in the heat exchanger to be tested, tdIs the depth of the flat tube, thIs the height of the flat tube, tlIs the length of the flat tube;
if the cross-section of flat pipe is the rectangle, then:
St＝Nt*2*(td+th)*tl
nf＝tl*df
Sf＝(fl-di*2+π*di*2)*(nf+1)*Nf*tf
wherein S isfFor the heat exchange area of the fin, flIs the fin length, diIs the fillet of the fin, nfIs the total wave number of the fins, NfTotal number of fins, tfThe fin depth is df；
Sa＝St+Sf
Wherein S isaIs the total heat exchange area.
Further, the information correction is performed on the operating condition information, and an adopted formula is as follows:
ρc＝-0.00000002*t1′3-0.0024*t1′2-0.3386*t1′+ρb
wherein ρcAs a correction value for the density of the cooling medium, t 1' is the cooling medium inlet temperature, ρbDensity of the cooling medium under standard working conditions;
Figure BDA0003597176250000031
wherein ρaIs the cold side fluid density, PaFor pressure, t 2' is the cold side fluid inlet temperature.
Further, the total heat exchange coefficient of the heat exchanger to be tested is determined according to the corrected running condition information, and the adopted formula is as follows:
Figure BDA0003597176250000032
wherein K is the total heat exchange coefficient, ha is the air side heat conduction coefficient of the heat exchanger to be tested, hc is the heat conduction coefficient of the cooling medium side, and Rr is the thermal resistance of the heat exchanger to be tested;
Figure BDA0003597176250000033
Figure BDA0003597176250000034
Figure BDA0003597176250000035
wherein λ a is air heat transfer coefficient, ReaIs air side Reynolds coefficient, PraIs the Plantt constant of the air side, la is the characteristic dimension of the heat transfer surface of the air side, λ c is the heat transfer coefficient of the cooling medium, RecReynolds number, Pr, of the cooling mediumcIs the Plantt constant of the cooling medium side, lc is the characteristic dimension of the heat transfer surface of the cooling medium, λlDs is the heat transfer coefficient of the fin material, and Ds is the thickness of the heat exchange material.
Further, the total heat exchange amount of the heat exchanger to be tested is determined according to the total heat exchange coefficient and the total heat exchange area, and the formula is as follows:
Q＝KSΔT1
Q＝CmΔTc
wherein Q is the total heat exchange amount, Delta T1 is the logarithmic mean temperature difference, C is the specific heat capacity of the heat transfer medium, m is the mass flow of the heat transfer medium, and Delta Tc is the mathematical temperature difference of the inlet and outlet of the heat transfer medium;
ΔT1＝[(t1″-t2′)-(t1′-t2″)]/ln[(t1″-t2′)/(t1′-t2″)]
ΔTc＝t1′-t1″
where t1 'is the inlet temperature of the hot side fluid, t1 "is the outlet temperature of the hot side fluid, t 2' is the inlet temperature of the cold side fluid, and t 2" is the inlet temperature of the cold side fluid.
Further, after determining the total heat exchange coefficient of the heat exchanger to be tested according to the corrected operating condition information, the method further includes:
acquiring a target heat exchange quantity of the heat exchanger to be detected, and determining a target heat exchange coefficient according to the target heat exchange quantity and the operation condition information;
fitting calculation is carried out on the total heat exchange coefficient and the target heat exchange coefficient to obtain the fitting degree;
and if the fitting degree is smaller than a fitting threshold value, carrying out error prompt on the heat exchanger to be tested.
A second aspect of an embodiment of the present invention provides a heat exchanger performance testing system, including:
the heat exchange area determination module is used for respectively acquiring core structure parameters, flat tube structure parameters and fin structure parameters in the heat exchanger to be tested, and determining a total heat exchange area according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, wherein the total heat exchange area comprises a flat tube heat exchange area and a fin heat exchange area;
the information correction module is used for acquiring the running condition information of the heat exchanger to be detected and correcting the running condition information, wherein the running condition information comprises hot side fluid information and cold side fluid information;
the heat exchange amount determining module is used for determining the total heat exchange coefficient of the heat exchanger to be detected according to the corrected running condition information and determining the total heat exchange amount of the heat exchanger to be detected according to the total heat exchange coefficient and the total heat exchange area;
and the test result generating module is used for generating a performance test result of the heat exchanger to be tested according to the total heat exchange quantity.
A third aspect of the embodiments of the present invention provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the terminal device, where the processor implements the steps of the heat exchanger performance testing method provided in the first aspect when executing the computer program.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the heat exchanger performance testing method provided by the first aspect.
The heat exchanger performance testing method, the heat exchanger performance testing system, the terminal device and the storage medium provided by the embodiment of the invention have the following beneficial effects: through 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, the information correction is carried out on the operation condition information, the fluid information under different environmental temperatures and pressures can be automatically corrected, the accuracy of the performance test of the heat exchanger is improved, the total heat exchange coefficient of the heat exchanger to be tested can be automatically determined according to the corrected operation condition information, the total heat exchange quantity of the heat exchanger to be tested can be automatically determined based on the total heat exchange coefficient and the total heat exchange area, the actual measurement is carried out without manufacturing sample pieces aiming at the heat exchangers with different sizes or specifications, and the accuracy of the performance test of the heat exchanger is improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a flow chart of an implementation of a method for testing performance of a heat exchanger according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a heat exchange performance chart provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a heat removal vs. cooling medium flow performance graph provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a heat dissipation vs. wind speed performance graph provided by an embodiment of the present invention;
FIG. 5 is a schematic calculation flow chart of a heat exchanger performance testing method provided by an embodiment of the invention;
FIG. 6 is a flow chart of a method for testing performance of a heat exchanger according to another embodiment of the present invention;
FIG. 7 is a schematic calculation flow chart of a heat exchanger performance testing method according to another embodiment of the present invention;
fig. 8 is a block diagram of a heat exchanger performance testing system according to an embodiment of the present invention;
fig. 9 is a block diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1, fig. 1 shows a flowchart for implementing a method for testing performance of a heat exchanger according to an embodiment of the present invention, including:
step S10, respectively obtaining a core structure parameter, a flat tube structure parameter and a fin structure parameter in a heat exchanger to be tested, and determining a total heat exchange area according to the core structure parameter, the flat tube structure parameter and the fin structure parameter;
wherein, total heat transfer area includes flat pipe heat transfer area and fin heat transfer area, and this core structure parameter includes core size width w height h thickness t, and flat pipe structure parameter includes cross sectional dimension height thDeep tdMaterial thickness deltatNumber of flat tube rows ntThe number of flat tube rows is usually 1 or 2, and the gaps d between the flat tubest。
Optionally, in this step, the total heat exchange area is determined according to the core structure parameters, the flat tube structure parameters, and the fin structure parameters, and an adopted formula is as follows:
if the cross section of the flat pipe is circular, then:
Figure BDA0003597176250000061
wherein S istFor flat tube heat transfer area, NtIs the total number of flat tubes in the heat exchanger to be measured, tdFor flat tube depth, thIs the height of the flat tube, tlIs the length of the flat tube;
if the cross-section of flat pipe is the rectangle, then:
St＝Nt*2*(td+th)*tl
nf＝tl*df
Sf＝(fl-di*2+π*di*2)*(nf+1)*Nf*tf
Figure BDA0003597176250000062
wherein S isfIs the heat exchange area of the fin, flIs the length of the fin, diIs the fillet of the fin, nfIs the total wave number of the fins, NfTotal number of fins, tfIs the fin depth, δfIs the thickness of the fin, the density of the fin is dfUsually t isf＝td；
Sa＝St+Sf
Wherein S isaIs the total heat exchange area.
Step S20, acquiring the running condition information of the heat exchanger to be tested, and correcting the running condition information;
wherein the operation condition information includes hot side fluid information including a kind, density, parameter information of the hot side fluid and an inlet temperature of the hot side fluid, the hot side fluid includes one or a combination of more of antifreeze, engine oil or transmission oil, etc., and cold side fluid information including a flow rate V of the cold side fluid, such as air or refrigerant, etccInlet temperature t 2' of cold-side fluid;
in the step, because the temperature of different cooling media and the performance of the heat exchanger at the ambient temperature are different, the physical information such as density and the like at different ambient temperatures and pressures can be automatically corrected by performing information correction on the operation condition information, so that the accuracy of the performance test of the heat exchanger is improved.
Optionally, in this step, the information of the operating condition information is corrected by using a formula:
ρc＝-0.00000002*t1′3-0.0024*t1′2-0.3386*t1′+ρb
wherein ρcAs a correction value for the density of the cooling medium, t 1' is the cooling medium inlet temperature, ρbDensity of the cooling medium under standard working conditions;
Figure BDA0003597176250000071
wherein ρaIs the cold side fluid density, PaAs pressure, t2′The cold side fluid inlet temperature.
Step S30, determining the total heat exchange coefficient of the heat exchanger to be tested according to the corrected running condition information, and determining the total heat exchange quantity of the heat exchanger to be tested according to the total heat exchange coefficient and the total heat exchange area;
the total heat exchange coefficient of the heat exchanger to be tested can be automatically determined according to the corrected running condition information, the total heat exchange quantity of the heat exchanger to be tested can be automatically determined based on the total heat exchange coefficient and the total heat exchange area, and for heat exchangers of different sizes or specifications, sample pieces do not need to be manufactured for actual measurement, so that the accuracy of performance test of the heat exchanger is improved;
optionally, in this step, after determining the total heat exchange amount of the heat exchanger to be tested according to the total heat exchange coefficient and the total heat exchange area, the method further includes:
determining hot side fluid resistance and cold side fluid resistance according to the heat exchange area of the flat pipes, the heat exchange area of the fins and the operation condition information;
generating a heat exchange 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 exchange amount;
referring to fig. 2 to 5, in this step, the heat exchange performance diagram includes a heat exchange performance chart, a heat dissipation capacity-cooling medium flow performance diagram, and a heat dissipation capacity-wind speed performance diagram, the heat exchange performance chart visually shows the heat exchange efficiency range of the heat exchanger to be tested, and the generation of the heat exchange performance diagram effectively facilitates the user to check the performance of the heat exchanger to be tested.
Optionally, in this step, the hot-side fluid resistance and the cold-side fluid resistance are determined according to the heat exchange area of the flat tubes, the heat exchange area of the fins, and the operation condition information, and the calculation formula adopted is as follows:
Ra＝∑Ri
wherein Ra is the total resistance, RiIs the fluid resistance of each segment;
this embodiment considers the flow as an intermediate flow in the pipe, and the in-pipe on-way resistance calculation formula is as follows:
R′＝Ks*q2
Figure BDA0003597176250000081
wherein R' is the on-way resistance, Ks is the on-way resistance, q is the fluid flow, lambda is the on-way resistance coefficient, L is the length of the tube, g is the gravitational acceleration, and d is the effective diameter;
Figure BDA0003597176250000082
at is the flow cross section area, Pt is the wetted perimeter, and both the flow cross section area and the wetted perimeter can be obtained by calculating the structural sizes of the flat pipes and the fins:
At＝(td-2δt)*(th-2δt)
Pt＝(td-2δt)+(th-2δt)
wherein, deltatThe material thickness of the flat tube.
Further, in this step, the total heat exchange coefficient of the heat exchanger to be measured is determined according to the corrected operating condition information, and the formula adopted is as follows:
Figure BDA0003597176250000083
k is a total heat exchange coefficient, ha is a heat conduction coefficient of the air side of the heat exchanger to be tested, hc is a heat conduction coefficient of the cooling medium side, and Rr is a thermal resistance of the heat exchanger to be tested;
Figure BDA0003597176250000091
Figure BDA0003597176250000092
Figure BDA0003597176250000093
wherein λ a is air heat transfer coefficient, ReaIs air side Reynolds coefficient, PraLa is the characteristic dimension of the heat transfer surface on the air side, and may be the pipe diameter (inner diameter, outer diameter or average diameter) or the plate length, λ c is the heat transfer coefficient of the cooling medium, and Re iscFor cooling mediumReynolds number of mass, PrcLc is the characteristic dimension of the heat transfer surface of the cooling medium, and is the Plantt constant on the cooling medium side, and may be the pipe diameter (inner diameter, outer diameter, or average diameter), the plate length, or the like, and λlDs is the heat transfer coefficient of the fin material, and Ds is the thickness of the heat exchange material.
Reynolds number is an important parameter for characterizing the flow of fluid, and is calculated as follows
Figure BDA0003597176250000094
Where Re represents the reynolds number of the fluid, v viscosity, a physical parameter of the fluid medium, is a constant, l is a fixed size, and l is t for flow in the pipedAnd u is the average velocity of the fluid, which can be converted from the incoming flow rate.
Further, in this step, the total heat exchange amount of the heat exchanger to be measured is determined according to the total heat exchange coefficient and the total heat exchange area, and an adopted formula is as follows:
Q＝KSΔT1
Q＝CmΔTc
wherein Q is the total heat exchange quantity, Delta T1 is the logarithmic mean temperature difference, C is the specific heat capacity of the heat transfer medium, m is the mass flow of the heat transfer medium, and Delta Tc is the mathematical temperature difference of 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 t 2" is the inlet temperature of the cold side fluid, in this step, t1 ' and t2 ' are generally stored in the operation condition information, i.e. are known parameters, and t1 "and t 2" can be calculated according to the above formula and t1 ' and t2 ", and then the logarithmic mean temperature difference is calculated according to t 1" and t2 ".
Step S40, generating a performance test result of the heat exchanger to be tested according to the total heat exchange quantity;
the method comprises the steps of obtaining a heat exchange quantity expected value of a heat exchanger to be tested, carrying out numerical comparison on the total heat exchange quantity and the heat exchange quantity expected value to obtain a performance test result, judging the performance test result of the heat exchanger to be tested to be excellent when the ratio of the total heat exchange quantity to the heat exchange quantity expected value is larger than or equal to a first threshold value, judging the performance test result of the heat exchanger to be tested to be medium when the ratio of the total heat exchange quantity to the heat exchange quantity expected value is larger than a second threshold value and smaller than the first threshold value, judging the performance test result of the heat exchanger to be tested to be poor when the ratio of the total heat exchange quantity to the heat exchange quantity expected value is smaller than or equal to the second threshold value, and setting the first threshold value and the second threshold value according to user requirements.
Specifically, in this step, please refer to fig. 5, which is a schematic diagram of a calculation flow of a heat exchanger performance testing method provided in the embodiment, where core structure parameters in a heat exchanger to be tested are obtained in step 1001, flat tube structure parameters are obtained in step 1002, fin structure parameters are obtained in step 1003, operating condition information of the heat exchanger to be tested is obtained in step 1004, a heat exchange area of the flat tube is calculated in step 1005, a heat exchange area of the fin is calculated in step 1006, a total heat exchange coefficient is calculated in step 1007, a total heat exchange capacity of the heat exchanger to be tested is calculated in step 1009, a hot side fluid resistance and a cold side fluid resistance are calculated in step 1008, a heat exchange performance chart is generated in step 1010, and a heat dissipation capacity-cooling medium flow performance chart and a heat dissipation capacity-wind speed performance chart are generated in step 1011.
In this embodiment, through core structure parameter, flat tube structure parameter and fin structure parameter, can the automatic determination treat the total heat transfer area of side heat exchanger, through carrying out the information correction to operating condition information, can revise fluid information under different ambient temperature and pressure automatically, the accuracy of heat exchanger capability test has been improved, according to the operating condition information after the correction, can the automatic determination reach the total heat transfer coefficient of the heat exchanger that awaits measuring, based on total heat transfer coefficient and total heat transfer area, can the automatic determination reach the total heat transfer volume of the heat exchanger that awaits measuring, to the heat exchanger of different sizes or specifications, need not to make the sample piece and carry out the actual measurement, the accuracy of heat exchanger capability test has been improved.
Referring to fig. 6, fig. 6 is a flowchart illustrating a method for testing performance of a heat exchanger according to another embodiment of the present invention. With respect to the embodiment of fig. 1, the method for testing the performance of the heat exchanger provided in this embodiment is used to further refine step S30 in the embodiment of fig. 1, and includes:
step S50, acquiring a target heat exchange quantity of the heat exchanger to be tested, and determining a target heat exchange coefficient according to the target heat exchange quantity and the operation condition information;
determining a target heat exchange coefficient according to the target heat exchange quantity and the operation condition information, wherein the formula is as follows:
Qo＝ε*Cmin*(t1′-t2′)
wherein Q isoFor the input target heat exchange amount, ε is the heat transfer effectiveness, C is the equivalent number, t1 'is the hot fluid inlet temperature, and t 2' is the cold fluid inlet temperature.
Figure BDA0003597176250000111
Wherein the content of the first and second substances,
Figure BDA0003597176250000112
the specific heat capacity is adopted, m is the fluid mass flow, and the equivalent number of hot side fluid and the equivalent number of cooling fluid are different due to the difference of the fluids;
Figure BDA0003597176250000113
where ε is the effectiveness of heat transfer, Cmin is the minimum number of equivalents, Cmax is the maximum number of equivalents, and the actual value is the number of equivalents of hot and cold side fluids;
Figure BDA0003597176250000114
wherein, Ko is a target heat exchange coefficient, Sa is a total heat exchange area, and NTU is the number of heat transfer units.
Step S60, fitting the total heat exchange coefficient and the target heat exchange coefficient to obtain a fitting degree;
wherein the fitting degree is used for representing the similarity between the total heat exchange coefficient and the target heat exchange coefficient;
step S70, if the fitting degree is smaller than a fitting threshold value, carrying out error prompt on the heat exchanger to be tested;
in this step, if the degree of fitting is less than the fitting threshold, it is determined that an error exists in the size design of the heat exchanger to be tested, and therefore an error prompt is performed on the heat exchanger to be tested, so as to prompt a user to adjust the size parameters of the heat exchanger to be tested.
Specifically, in this embodiment, referring to fig. 7, a target heat exchange amount of the heat exchanger to be tested is obtained through step 2001, a target heat exchange coefficient is calculated through step 2002, the fitting degree is compared with a fitting threshold through step 2003, and step 2004 is executed when it is determined that the fitting degree is smaller than the fitting threshold.
In the embodiment, the target heat exchange quantity of the heat exchanger to be tested is obtained, the target heat exchange coefficient can be automatically calculated based on the target heat exchange quantity and the running condition information, the fitting degree is obtained by fitting and calculating the total heat exchange coefficient and the target heat exchange coefficient, the size of the heat exchanger to be tested can be effectively detected based on the comparison between the fitting degree and the fitting threshold value, and the accuracy of the performance test of the heat exchanger is improved.
Referring to fig. 8, fig. 8 is a block diagram of a heat exchanger performance testing system 100 according to an embodiment of the present invention. The heat exchanger performance testing system 100 in this embodiment includes units for performing the steps in the embodiment corresponding to fig. 1 and 6. Please refer to fig. 1 and fig. 6 and the related descriptions in the embodiments corresponding to fig. 1 and fig. 6. For convenience of explanation, only the portions related to the present embodiment are shown. Referring to fig. 8, the heat exchanger performance testing system 100 includes: the heat exchange area determining module 10, the information correcting module 11, the heat exchange amount determining module 12 and the test result generating module 13, wherein:
the heat exchange area determining module 10 is configured to obtain core structure parameters, flat tube structure parameters, and fin structure parameters of the heat exchanger to be measured, and determine a 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 a flat tube heat exchange area and a fin heat exchange area. Wherein, total heat transfer area includes flat pipe heat transfer area and fin heat transfer area, and this core structure parameter includes core size width w height h thickness t, and flat pipe structure parameter includes cross sectional dimension height thDeep tdMaterial thickness deltatNumber of flat tube rows ntThe number of flat tube rows is usually 1 or 2, and the gaps d between the flat tubest。
Optionally, the total heat exchange area is determined according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, and an adopted formula is as follows:
if the cross section of the flat pipe is circular, then:
Figure BDA0003597176250000121
wherein S istFor the heat exchange area of the flat tubes, NtTotal number of flat tubes in the heat exchanger to be tested, tdIs the depth of the flat tube, thIs the height of the flat tube, tlIs the length of the flat tube;
if the cross-section of flat pipe is the rectangle, then:
St＝Nt*2*(td+th)*tl
nf＝tl*df
Sf＝(fl-di*2+π*di*2)*(nf+1)*Nf*tf
wherein S isfFor the heat exchange area of the fin, flIs the fin length, diIs the fillet of the fin, nfIs the total wave number of the fins, NfTotal number of fins, tfIs a finDepth, fin density df；
Sa＝St+Sf
Wherein S isaIs the total heat exchange area.
The information correction module 11 is configured to acquire operation condition information of the heat exchanger to be detected, and perform information correction on the operation condition information, where the operation condition information includes hot-side fluid information and cold-side fluid information. Wherein the operation condition information comprises hot side fluid information and cold side fluid information, the hot side fluid information comprises the type, density and parameter information of the hot side fluid and the inlet temperature of the hot side fluid, the hot side fluid comprises one or more of antifreeze, engine oil or gearbox oil and the like, the cold side fluid comprises air or refrigerant and the like, and the cold side fluid information further comprises the flow volume V of the cold side fluidcThe inlet temperature t 2' of the cold-side fluid. In the module, because the temperature of different cooling media and the performance of the heat exchanger at the ambient temperature are different, the information of the operating condition is corrected, and the physical information such as density at different ambient temperatures and pressures can be automatically corrected, so that the accuracy of the performance test of the heat exchanger is improved.
Optionally, the information of the operating condition information is corrected by using the following formula:
ρc＝-0.00000002*t1′3-0.0024*t1′2-0.3386*t1′+ρb
where ρ iscAs a correction value for the density of the cooling medium, t 1' is the cooling medium inlet temperature, ρbDensity of the cooling medium under standard working conditions;
Figure BDA0003597176250000131
where ρ isaIs the cold side fluid density, PaFor pressure, t 2' is the cold side fluid inlet temperature.
And the heat exchange amount determining module 12 is configured to determine a total heat exchange coefficient of the heat exchanger to be tested according to the corrected operating condition information, and determine a total heat exchange amount of the heat exchanger to be tested according to the total heat exchange coefficient and the total heat exchange area. The total heat exchange coefficient of the heat exchanger to be tested can be automatically determined according to the corrected running condition information, the total heat exchange quantity of the heat exchanger to be tested can be automatically determined based on the total heat exchange coefficient and the total heat exchange area, and for heat exchangers of different sizes or specifications, sample pieces do not need to be manufactured for actual measurement, so that the accuracy of performance test of the heat exchanger is improved.
Optionally, the heat exchange amount determination module 12 is further configured to: determining hot side fluid resistance and cold side fluid resistance according to the heat exchange area of the flat tubes, the heat exchange area of the fins and the operation condition information;
and generating a heat exchange 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 exchange amount.
Further, the total heat exchange coefficient of the heat exchanger to be tested is determined according to the corrected running condition information, and the adopted formula is as follows:
Figure BDA0003597176250000141
wherein K is the total heat exchange coefficient, ha is the air side heat conduction coefficient of the heat exchanger to be tested, hc is the heat conduction coefficient of the cooling medium side, and Rr is the thermal resistance of the heat exchanger to be tested;
Figure BDA0003597176250000142
Figure BDA0003597176250000143
Figure BDA0003597176250000144
wherein λ a is air heat transfer coefficient, ReaIs air side Reynolds coefficient, PraIs the Plantt constant of the air side, la is the characteristic dimension of the heat transfer surface of the air side, λ c is the heat transfer coefficient of the cooling medium, RecReynolds number, Pr, of the cooling mediumcIs the Plantt constant of the cooling medium side, lc is the characteristic dimension of the heat transfer surface of the cooling medium, λlDs is the heat transfer coefficient of the fin material, and Ds is the thickness of the heat exchange material.
Further, the total heat exchange amount of the heat exchanger to be tested is determined according to the total heat exchange coefficient and the total heat exchange area, and the formula is as follows:
Q＝KSΔT1
Q＝CmΔTc
wherein Q is the total heat exchange amount, Delta T1 is the logarithmic mean temperature difference, C is the specific heat capacity of the heat transfer medium, m is the mass flow of the heat transfer medium, and Delta Tc is the mathematical temperature difference of the inlet and outlet of the heat transfer medium;
ΔT1＝[(t1″-t2′)-(t1′-t2″)]/ln[(t1″-t2′)/(t1′-t2″)]
ΔTc＝t1′-t1″
where t1 'is the inlet temperature of the hot side fluid, t1 "is the outlet temperature of the hot side fluid, t 2' is the inlet temperature of the cold side fluid, and t 2" is the inlet temperature of the cold side fluid.
And the test result generating module 13 is configured to generate a performance test result of the heat exchanger to be tested according to the total heat exchange amount. The method comprises the steps of obtaining a heat exchange quantity expected value of a heat exchanger to be tested, carrying out numerical comparison on the total heat exchange quantity and the heat exchange quantity expected value to obtain a performance test result, judging the performance test result of the heat exchanger to be tested to be excellent when the ratio of the total heat exchange quantity to the heat exchange quantity expected value is larger than or equal to a first threshold value, judging the performance test result of the heat exchanger to be tested to be medium when the ratio of the total heat exchange quantity to the heat exchange quantity expected value is larger than a second threshold value and smaller than the first threshold value, judging the performance test result of the heat exchanger to be tested to be poor when the ratio of the total heat exchange quantity to the heat exchange quantity expected value is smaller than or equal to the second threshold value, and setting the first threshold value and the second threshold value according to user requirements.
Optionally, the test result generating module 13 is further configured to: acquiring a target heat exchange quantity of the heat exchanger to be detected, and determining a target heat exchange coefficient according to the target heat exchange quantity and the operation condition information;
fitting calculation is carried out on the total heat exchange coefficient and the target heat exchange coefficient to obtain the fitting degree;
and if the fitting degree is smaller than a fitting threshold value, carrying out error prompt on the heat exchanger to be tested.
In the embodiment, the total heat exchange area of the heat exchanger to be tested can be automatically determined through the core body structural parameters, the flat tube structural parameters and the fin structural parameters, the running condition information can be corrected, the fluid information under different environmental temperatures and pressures can be automatically corrected, the accuracy of the performance test of the heat exchanger is improved, the total heat exchange coefficient of the heat exchanger to be tested can be automatically determined according to the corrected running condition information, the total heat exchange quantity of the heat exchanger to be tested can be automatically determined based on the total heat exchange coefficient and the total heat exchange area, the actual measurement can be carried out on the heat exchangers with different sizes or specifications without manufacturing sample pieces, and the accuracy of the performance test of the heat exchanger is improved.
Fig. 9 is a block diagram of a terminal device 2 according to another embodiment of the present invention. As shown in fig. 9, the terminal device 2 of this embodiment includes: a processor 20, a memory 21 and a computer program 22 stored in said memory 21 and executable on said processor 20, such as a program of a heat exchanger performance testing method. The processor 20, when executing the computer program 22, implements the steps in the embodiments of the heat exchanger performance testing methods described above, such as S10-S40 shown in fig. 1, or S50-S70 shown in fig. 6. Alternatively, when the processor 20 executes the computer program 22, the functions of the modules in the embodiment corresponding to fig. 6, for example, the functions of the modules 10 to 13 shown in fig. 8, are implemented, for which reference is specifically made to the relevant description in the embodiment corresponding to fig. 6, and details are not repeated here.
Illustratively, the computer program 22 may be divided into one or more units, which are stored in the memory 21 and executed by the processor 20 to accomplish the present invention. The one or more units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 22 in the terminal device 2. For example, the computer program 22 may be divided into the heat exchange area determining module 10, the information correcting module 11, the heat exchange amount determining module 12, and the test result generating module 13, and the specific functions of the modules are as described above.
The terminal device may include, but is not limited to, a processor 20, a memory 21. Those skilled in the art will appreciate that fig. 9 is merely an example of the terminal device 2 and does not constitute a limitation of the terminal device 2, and may include more or fewer components than those shown, or some of the components may be combined, or different components, e.g., the terminal device may also include an input-output device, a network access device, a bus, etc.
The Processor 20 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 21 may be an internal storage unit of the terminal device 2, such as a hard disk or a 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, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, provided on the terminal device 2. Further, the memory 21 may also include both an internal storage unit and an external storage device of the terminal device 2. The memory 21 is used for storing the computer program and other programs and data required by the terminal device. The memory 21 may also be used to temporarily store data that has been output or is to be output.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when executed by a processor, the computer program may implement:
respectively obtaining core structure parameters, flat tube structure parameters and fin structure parameters in a heat exchanger to be tested, and determining a total heat exchange area according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, wherein the total heat exchange area comprises a flat tube heat exchange area and a fin heat exchange area;
acquiring running condition information of the heat exchanger to be tested, and performing information correction on the running condition information, wherein the running condition information comprises hot side fluid information and cold side fluid information;
determining the total heat exchange coefficient of the heat exchanger to be detected according to the corrected running condition information, and determining the total heat exchange quantity of the heat exchanger to be detected according to the total heat exchange coefficient and the total heat exchange area;
and generating a performance test result of the heat exchanger to be tested according to the total heat exchange quantity.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. A heat exchanger performance test method is characterized by comprising the following steps:
respectively obtaining core structure parameters, flat tube structure parameters and fin structure parameters in a heat exchanger to be tested, and determining a total heat exchange area according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, wherein the total heat exchange area comprises a flat tube heat exchange area and a fin heat exchange area;
acquiring running condition information of the heat exchanger to be tested, and performing information correction on the running condition information, wherein the running condition information comprises hot side fluid information and cold side fluid information;
determining the total heat exchange coefficient of the heat exchanger to be detected according to the corrected running condition information, and determining the total heat exchange quantity of the heat exchanger to be detected according to the total heat exchange coefficient and the total heat exchange area;
and generating a performance test result of the heat exchanger to be tested according to the total heat exchange quantity.
2. The method for testing the performance of the heat exchanger according to claim 1, after determining the total heat exchange amount of the heat exchanger to be tested according to the total heat exchange coefficient and the total heat exchange area, further comprising:
determining hot side fluid resistance and cold side fluid resistance according to the heat exchange area of the flat tubes, the heat exchange area of the fins and the operation condition information;
and generating a heat exchange 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 exchange amount.
3. The heat exchanger performance testing method according to claim 1, wherein a total heat exchange area is determined according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, and an adopted formula is as follows:
if the cross section of the flat pipe is circular, then:
Figure FDA0003597176240000011
wherein S istFor the heat exchange area of the flat tubes, NtTotal number of flat tubes in the heat exchanger to be tested, tdIs the depth of the flat tube, thIs the height of the flat tube, tlIs the length of the flat tube;
if the cross-section of flat pipe is the rectangle, then:
St＝Nt*2*(td+th)*tl
nf＝＝tl*df
Sf＝(fl-di*2+π*di*2)*(nf+1)*Nf*tf
wherein S isfFor the heat exchange area of the fin, flIs the length of the fin, diIs the fillet of the fin, nfIs the total wave number of the fins, NfTotal number of fins, tfThe fin depth is df；
Sa＝St+Sf
Wherein S isaIs the total heat exchange area.
4. The heat exchanger performance testing method according to claim 1, wherein the information correction is performed on the operating condition information by using a formula:
ρc＝-0.00000002*t1′3-0.0024*t1′2-0.3386*t1′+ρb
where ρ iscAs a correction value for the density of the cooling medium, t 1' is the cooling medium inlet temperature, ρbDensity of the cooling medium under standard working conditions;
Figure FDA0003597176240000021
where ρ isaIs the cold side fluid density, PaFor pressure, t 2' is the cold side fluid inlet temperature.
5. The method for testing the performance of the heat exchanger as recited in claim 4, wherein the total heat exchange coefficient of the heat exchanger to be tested is determined according to the corrected information of the operating conditions, and the formula adopted is as follows:
Figure FDA0003597176240000022
wherein K is the total heat exchange coefficient, ha is the air side heat conduction coefficient of the heat exchanger to be tested, hc is the heat conduction coefficient of the cooling medium side, and Rr is the thermal resistance of the heat exchanger to be tested;
Figure FDA0003597176240000023
Figure FDA0003597176240000024
Figure FDA0003597176240000025
wherein λ a is air heat transfer coefficient, ReaIs air side Reynolds coefficient, PraIs the Plantt constant of the air side, la is the characteristic dimension of the heat transfer surface of the air side, λ c is the heat transfer coefficient of the cooling medium, RecReynolds number, Pr, of the cooling mediumcIs the Plantt constant on the cooling medium side, lc is the characteristic dimension of the heat transfer surface of the cooling medium, λlDs is the heat transfer coefficient of the fin material, and Ds is the thickness of the heat exchange material.
6. The method for testing the performance of the heat exchanger as claimed in claim 5, wherein the total heat exchange quantity of the heat exchanger to be tested is determined according to the total heat exchange coefficient and the total heat exchange area, and the formula adopted is as follows:
Q＝KSΔT1
Q＝CmΔTc
wherein Q is the total heat exchange quantity, Delta T1 is the logarithmic mean temperature difference, C is the specific heat capacity of the heat transfer medium, m is the mass flow of the heat transfer medium, and Delta Tc is the mathematical temperature difference of the inlet and outlet of the heat transfer medium;
ΔT1＝[(t1″-t2′)-(t1′-t2″)]/ln[(t1″-t2′)/(t1′-t2″)]
ΔTc＝t1′-t1″
where t1 'is the inlet temperature of the hot side fluid, t1 "is the outlet temperature of the hot side fluid, t 2' is the inlet temperature of the cold side fluid, and t 2" is the inlet temperature of the cold side fluid.
7. The method for testing the performance of the heat exchanger according to any one of claims 1 to 6, wherein after determining the total heat exchange coefficient of the heat exchanger to be tested according to the corrected operating condition information, the method further comprises the following steps:
acquiring a target heat exchange quantity of the heat exchanger to be detected, and determining a target heat exchange coefficient according to the target heat exchange quantity and the operation condition information;
fitting calculation is carried out on the total heat exchange coefficient and the target heat exchange coefficient to obtain the fitting degree;
and if the fitting degree is smaller than a fitting threshold value, carrying out error prompt on the heat exchanger to be tested.
8. A heat exchanger performance testing system, comprising:
the heat exchange area determination module is used for respectively acquiring core structure parameters, flat tube structure parameters and fin structure parameters in the heat exchanger to be tested, and determining a total heat exchange area according to the core structure parameters, the flat tube structure parameters and the fin structure parameters, wherein the total heat exchange area comprises a flat tube heat exchange area and a fin heat exchange area;
the information correction module is used for acquiring the running condition information of the heat exchanger to be detected and correcting the running condition information, wherein the running condition information comprises hot side fluid information and cold side fluid information;
the heat exchange amount determining module is used for determining the total heat exchange coefficient of the heat exchanger to be detected according to the corrected running condition information and determining the total heat exchange amount of the heat exchanger to be detected according to the total heat exchange coefficient and the total heat exchange area;
and the test result generating module is used for generating a performance test result of the heat exchanger to be tested according to the total heat exchange quantity.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of a method according to any one of claims 1 to 7.
CN202210391642.3A 2022-04-14 2022-04-14 Heat exchanger performance testing method and system, terminal equipment and storage medium Pending CN114781283A (en)

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