CN115791244B - Modular microchannel compact heat exchange experiment body, method, equipment and medium - Google Patents
Modular microchannel compact heat exchange experiment body, method, equipment and medium Download PDFInfo
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- CN115791244B CN115791244B CN202310065108.8A CN202310065108A CN115791244B CN 115791244 B CN115791244 B CN 115791244B CN 202310065108 A CN202310065108 A CN 202310065108A CN 115791244 B CN115791244 B CN 115791244B
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Abstract
The invention discloses a module type micro-channel compact heat exchange experiment body, a method, equipment and a medium, and belongs to the technical field of performance test of heat exchange equipment. The experimental body comprises a core module which is used for realizing that a fluid working medium flows through a flow channel to be tested and exchanges heat with the boundary module to finish the convective heat exchange process; the boundary module is used for realizing the flow of boundary working media so as to provide different heat exchange boundary conditions for the core module, so as to finish the performance measurement of the core module under different boundary conditions; and the connecting assembly compresses and fixes the core module and the boundary module and guides working medium to enter and exit. The invention can measure the thermal parameters in the micro-channel based on the modularized design, and provides data support for researching the micro-channel heat exchanger and establishing a flow heat transfer experiment database.
Description
Technical Field
The invention relates to the technical field of performance test of heat exchange equipment, in particular to a modular microchannel compact heat exchange experimental body, a method, equipment and a medium.
Background
The heat exchanger is a general process device for heat exchange operation and is widely applied to the industrial departments of nuclear energy, chemistry, power, metallurgy and the like. In particular, in the power circulation systems of ships, submarines and aircrafts, the heat exchanger plays an important role in transferring and allocating energy among working media.
Along with the continuous improvement of the technology level, people pay more and more attention to the environmental friendliness of power systems in nuclear power stations, thermal power stations and aeroengines, efficiency improvement, cost reduction and natural resource consumption are one of the directions of future development in the field, and miniaturization and modularization are the development targets of the power systems for enabling the power systems to have the capability of being suitable for various complex environments. The types of heat exchangers used in the current industrial application mainly comprise shell-and-tube heat exchangers, plate-fin heat exchangers and the like, and the heat exchangers can not simultaneously meet the requirements of large heat exchange specific surface area, high welding strength and small volume. In recent years, with the improvement of the industrial manufacturing level, a micro-channel compact heat exchanger taking high-precision chemical etching and vacuum diffusion welding as process cores is widely focused, and the micro-channel compact heat exchanger has the advantages of small runner size, high compactness, no welding slag in a welding mode, and strength of a joint close to that of a base material, and has obvious advantages.
However, in the process of applying the microchannel compact heat exchanger, it is found that, due to the integrally formed processing of such heat exchangers, it is difficult to measure the flow heat transfer performance in a single flow channel, and only the overall inaccurate performance parameters can be obtained, resulting in a deviation between the design result and the actual test result.
Disclosure of Invention
The invention provides a modular micro-channel compact heat exchange experimental body, which aims to solve the problem that the flow heat transfer performance in a single flow channel is difficult to measure in the integral molding processing of the existing micro-channel heat exchanger. The invention can measure the thermal parameters in the micro-channel based on the modularized design, and provides data support for researching the micro-channel heat exchanger and establishing a flow heat transfer experiment database.
The invention is realized by the following technical scheme:
a modular microchannel compact heat exchange experimental body comprising:
the core module is used for realizing that the fluid working medium flows through the flow channel to be tested and exchanges heat with the boundary module to finish the convective heat exchange process;
the boundary module is used for realizing the flow of boundary working media so as to provide different heat exchange boundary conditions for the core module, so as to finish the performance measurement of the core module under different boundary conditions;
and the connecting assembly compresses and fixes the core module and the boundary module and guides working medium to enter and exit.
As a preferred embodiment, the core module of the present invention includes a sealing plate to be measured and a flow channel plate to be measured;
a plurality of temperature measuring grooves are formed in the sealing plate to be measured in a working medium flowing mode, and the depth of each temperature measuring groove does not exceed the thickness of the sealing plate to be measured;
the flow channel plate to be tested is provided with a flow channel to be tested along the flow direction of the working medium, and the depth of the flow channel to be tested is not more than the thickness of the flow channel plate to be tested;
and the sealing plate to be tested and the runner plate to be tested are provided with fixing holes and working medium inlets and outlets.
As an optimal implementation mode, the upper surface and the lower surface of the flow channel plate to be detected are respectively overlapped with one sealing plate to be detected and welded into a whole, and one side of the two sealing plates to be detected with the temperature measuring grooves is far away from the flow channel plate to be detected.
As a preferable implementation mode, the end part of the temperature measuring groove is arranged at the center of the sealing plate to be measured, the diameter of the section of the temperature measuring groove is 1-5mm, and the section of the temperature measuring groove is semicircular, rectangular or trapezoidal;
the diameter of the section of the flow channel to be measured is 1-5mm, and the section is semicircular, rectangular or trapezoidal;
the shape of the flow channel to be measured in the flowing direction of the working medium comprises a linear shape, a folded line shape, a streamline shape or an S-fin shape.
As a preferred embodiment, the boundary module of the present invention includes a boundary sealing plate, a boundary flow-path plate, and a compression sleeve;
the boundary runner plate is provided with a boundary runner, and the depth of the boundary runner is not more than the thickness of the boundary runner plate;
working medium inlets and outlets are formed in the boundary sealing plate and the boundary runner plate;
the boundary sealing plate and the boundary runner plate are stacked and welded into a whole, and one side of the boundary runner plate with the boundary runner is contacted with the boundary sealing plate;
four compressing sleeves are welded and fixed at four corners of the outer surface of the boundary sealing plate through bent metal rods with different heights, wherein two compressing sleeves in the diagonal direction are in a group, and belong to the same height.
As a preferred embodiment, the boundary module of the present invention is square overall, and has a side length equal to the width of the core module but smaller than the length of the core module;
the plurality of boundary modules cover the upper surface and the lower surface of the core module, and two compression sleeves with different heights on two adjacent boundary modules are mutually aligned.
As a preferred embodiment, each of the boundary modules of the present invention can be rotatably installed at a preset angle to form different boundary conditions.
As a preferred embodiment, the boundary flow channel of the present invention has an interface diameter of 1-5mm and a cross-sectional shape of a semicircle, rectangle or trapezoid.
As a preferred embodiment, the connection assembly of the present invention comprises a compression stud, a compression nut, a nipple and a hose;
the inlet and outlet holes of the core module and the boundary module are welded with connecting pipes; sequentially connecting a plurality of boundary modules through hoses, and sequentially connecting the boundary modules in series through connecting pipes at an inlet and an outlet;
the compression studs penetrate through the boundary module and the core module, and compression nuts are screwed at two ends of the compression studs so as to compress and fix the boundary module and the core module.
In a second aspect, the invention provides a performance measurement method based on the module type micro-channel compact heat exchange experiment body, which comprises the following steps:
temperature sensors are arranged on the core module and the boundary module, and pressure sensors are arranged at inlet and outlet positions of the two sides of the fluid working medium of the core module and the boundary working medium of the boundary module;
placing the whole experimental body with the measuring sensor into a closed circulation loop and arranging a flowmeter;
after the loop is started and regulated to reach the design working condition and be stable, obtaining the inlet and outlet temperatures, the running pressure, the running flow, the metal wall temperatures at different positions along the path and the inlet and outlet temperatures of each boundary module by measuring the sensor;
and calculating the flow heat transfer characteristics of the experimental body at a plurality of positions along the path according to the measured data.
As a preferred embodiment, the method of the present invention further comprises:
and the installation position of the boundary module is adjusted, so that the measurement of the heat exchange performance of the micro-channel under different boundary conditions is realized.
In a third aspect, the invention provides a data processing method based on the modular microchannel compact heat exchange experimental body, comprising the following steps:
acquiring inlet and outlet temperatures, operating pressure, operating flow, metal wall temperatures at different positions along the path of the fluid working medium in the core module and inlet and outlet temperatures of each boundary module;
according to the conservation of energy of heat exchange between the fluids at two sides, calculating to obtain the outlet fluid temperature of the fluid working medium in the core module in the coverage range of the corresponding boundary module;
obtaining the along-path temperature distribution of the fluid in the core module according to the inlet and outlet fluid problems of the fluid working medium in the core module in the coverage range of the corresponding boundary module;
and calculating the heat convection coefficients of a plurality of positions along the core module according to the along-path temperature distribution of the fluid in the core module and the corresponding metal wall surface temperature.
In a fourth aspect, the present invention proposes a computer device comprising a memory storing a computer program and a processor implementing the steps of the data processing method described above when the processor executes the computer program.
In a fifth aspect, the present invention proposes a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the data processing method described above.
The invention has the following advantages and beneficial effects:
the traditional micro-channel compact heat exchange body cannot measure the thermal parameters such as the internal temperature and pressure of the micro-channel due to the fact that the micro-channels are stacked in a large quantity, and the processing is complex. Compared with the experimental body provided by the invention, the temperature and the pressure in the micro-channel can be measured, the processing and the assembly are convenient, different cooling boundaries can be provided, the accuracy of measuring the heat exchange performance of the micro-channel is improved, the measuring range is expanded, and the experimental body is widely applicable to the use environment of the micro-channel heat exchanger.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of the components of an experimental body according to an embodiment of the present invention.
Fig. 2 is an assembled cross-sectional view of an experimental body according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a boundary module and a core module after overlapping according to an embodiment of the present invention.
In the drawings, the reference numerals and corresponding part names:
the device comprises a sealing plate to be tested 1-, a flow channel plate to be tested 2-, a boundary sealing plate 3-, a boundary flow channel plate 4-, a temperature measuring groove 5-, a flow channel to be tested 6-, a pressing sleeve 7-, a boundary flow channel 8-, a pressing stud 9-, a pressing nut 10-, a connecting pipe 11-and a hose 12-.
Detailed Description
Hereinafter, the terms "comprises" or "comprising" as may be used in various embodiments of the present invention indicate the presence of inventive functions, operations or elements, and are not limiting of the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the invention, the terms "comprises," "comprising," and their cognate terms are intended to refer to a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be interpreted as first excluding the existence of or increasing likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B or may include both a and B.
Expressions (such as "first", "second", etc.) used in the various embodiments of the invention may modify various constituent elements in the various embodiments, but the respective constituent elements may not be limited. For example, the above description does not limit the order and/or importance of the elements. The above description is only intended to distinguish one element from another element. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described to "connect" one component element to another component element, a first component element may be directly connected to a second component element, and a third component element may be "connected" between the first and second component elements. Conversely, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular is intended to include the plural as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the invention belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the invention.
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Examples:
the traditional microchannel heat exchanger can only obtain the integral heat transfer performance parameters due to integral molding processing, can not measure the flow heat transfer performance in the microchannel inside the microchannel heat exchanger, and can not provide accurate and reliable heat transfer performance results for the design of the heat exchanger. In view of this, the embodiment of the invention provides a modular microchannel compact heat exchange experimental body, which comprises:
and the core module is used for realizing that the fluid working medium flows through the micro-channel and exchanges heat with the boundary module to finish the convective heat exchange process.
And the boundary module is used for providing different heat exchange boundary conditions for the core module so as to finish the performance measurement of the core module under different conditions.
The connecting assembly compresses and fixes all the modules of the experiment body, prevents the influence on the measurement result and the normal operation caused by shaking and air entering the modules, and connects the inlet and outlet of the fluid working medium.
The working principle of the experimental body provided by the embodiment of the invention is as follows: the fluid working medium flows in a micro-channel with a specific structure, and the boundary working medium flows in the boundary module, so that heat exchange is carried out between the fluid working medium and the boundary working medium; the fixed connection of each module of the whole experiment body is realized through the connecting component, so that the stable operation of the experiment body is ensured after the disassembly and assembly transformation is realized. The embodiment of the invention utilizes the modularized design principle, is convenient for disassembly and assembly transformation, and can realize accurate measurement of heat transfer performance parameters (flow channel temperature, pressure, flow and the like) in the micro-channel.
As shown in fig. 1, the core module according to the embodiment of the present invention includes a sealing plate 1 to be measured, a flow channel plate 2 to be measured, a temperature measuring groove 5, and a flow channel 6 to be measured. The temperature measuring groove 5 is obtained on the sealing plate 1 to be measured through machining (such as turning and milling) or chemical etching or photoetching, the flow channel 6 to be measured which is required to be studied is obtained on the flow channel plate 2 to be measured through machining (such as turning and milling) or chemical etching or photoetching, and the depths of the temperature measuring groove 5 and the flow channel 6 to be measured do not exceed the corresponding plate thicknesses. Through holes are formed in the periphery of the sealing plate 1 to be tested and the periphery of the runner plate 2 to be tested so as to facilitate the fixation of the compression studs 9. Through holes are processed at two ends of the sealing plate 1 to be tested for fluid working medium to enter and exit, and holes with the same depth as the flow channel 6 to be tested are processed at the corresponding positions of the flow channel plate 2 to be tested, so that a fluid working medium inlet and outlet a/A of the core module is formed. In this embodiment, the sealing plate 1 to be measured and the flow channel plate 2 to be measured have the same shape and size and are both rectangular structures.
The whole core module according to the embodiment of the invention stacks the sealing plate 1 to be tested, the flow channel plate 2 to be tested and the sealing plate 1 to be tested in sequence, and ensures that the temperature measuring groove 5 is not contacted with the flow channel 6 to be tested (i.e. the side of the sealing plate 1 to be tested with the temperature measuring groove 5 is far away from the flow channel plate 2 to be tested), as shown in fig. 2, and finally, a plurality of plates are welded into a whole by using, but not limited to, high-temperature vacuum diffusion welding, vacuum brazing, fusion welding and other modes.
Further, the length of the temperature measuring groove 5 in the embodiment of the invention is about half of the width of the sealing plate 1 to be measured, that is, the end of the temperature measuring groove is near the center of the sealing plate 1 to be measured, the diameter of the cross section is about 1-5mm, and the cross section includes but is not limited to semicircular, rectangular or trapezoidal geometric shapes.
Further, the cross-sectional diameters of the flow channel 6 to be measured and the boundary flow channel 8 in the embodiment of the invention are about 1-5mm, and the cross-sectional shapes include but are not limited to semicircular, rectangular, trapezoid and other geometric shapes; the shape of the flow channel 6 to be measured in the flow direction comprises a continuous flow channel such as a linear type and a folded line type or a discontinuous flow channel such as a streamline type and a S-fin type.
The boundary module of the embodiment of the invention comprises a boundary sealing plate 3, a boundary runner plate 4, a compression sleeve 7 and a boundary runner 8. The boundary runner plate 4 is processed by mechanical processing (such as turning and milling) or chemical etching or photoetching to obtain a boundary runner 8, the depth of the boundary runner 8 does not exceed the thickness of the boundary runner plate 4, a through hole is formed on the boundary sealing plate 3 and is used as a boundary working medium inlet and outlet, meanwhile, a hole with the depth equal to that of the boundary runner 8 is formed at a corresponding position of the boundary runner plate 4 to form a working medium inlet and outlet (B/B) of the boundary module, the boundary sealing plate 3 and the boundary runner plate 4 are stacked together and the boundary runner is inwards (namely, one side of the boundary runner plate 4 with the boundary runner 8 is contacted with the boundary sealing plate 3), and the boundary runner is welded into a whole by adopting a mode of high-temperature vacuum diffusion welding, vacuum brazing, fusion welding and the like.
The 4 compression sleeves 7 of the embodiment of the invention are welded and fixed at four corners of the outer surface of the boundary sealing plate 3 through two bending metal rods (or rigid structures such as straight rods, curved rods, ribs and the like) with different heights, wherein two compression sleeves in the diagonal direction are a group and belong to a high position or a low position; four compression sleeves 7 outside four corners of each boundary module are in an X shape in overlook, and two compression sleeves with two heights are connected end to end exactly.
In the embodiment of the invention, the whole boundary module is square, and the side length is equal to the width of the flow channel to be measured and smaller than the length of the flow channel to be measured. A plurality of boundary modules are covered on the upper surface and the lower surface of the core module, and a high compression sleeve 7 and a low compression sleeve 7 on two adjacent boundary modules are mutually aligned. If the boundary module is larger than one, the inlet and the outlet of the added boundary flow channel plate are through holes so as to increase the boundary heat exchange capacity.
The connecting assembly of the embodiment of the invention comprises a compression stud 9, a compression nut 10, a connecting tube 11 and a hose 12. Wherein the double ends of the compression studs 9 are threaded, the length is larger than or equal to the height of the whole experimental body (namely, the length of four compression sleeves and the thickness of one core module are shown in fig. 2), the compression studs 9 pass through the aligned compression sleeves, namely, one compression stud 9 passes through the four compression sleeves and one core module, as shown in fig. 2, and then the compression nuts 10 are used for screwing at two ends of the compression studs 9, and the two sides are pressed to enable the core module and the boundary module to be in full contact. The compression stud and the compression nut of the embodiment of the invention are made of metal materials such as stainless steel, ferroalloy, titanium alloy and the like.
The inlet and outlet holes of the core module and the boundary modules are welded with connecting pipes 11, and the inlet and outlet connecting pipes 11 on the boundary modules are sequentially connected through hoses 12, so that the boundary modules are sequentially connected in series. The hose 12 of the present embodiment is made of, but not limited to, flexible materials such as rubber, polytetrafluoroethylene, and the like.
Further, the materials of the sealing plate 1 to be tested, the runner plate 2 to be tested, the boundary sealing plate 3 and the boundary runner plate 4 in the embodiment of the invention are the same, and metal materials such as stainless steel, iron alloy, titanium alloy and the like can be adopted but not limited. Based on the experimental body provided by the embodiment, the micro-channel heat exchange performance measurement under different boundary conditions can be performed, and specifically comprises the following steps: one boundary module can be rotated by 90 degrees to be installed without any influence, different forms can enable boundary conditions to change, when the flow channel in the boundary module is parallel to the flow channel to be detected, the boundary module is a concurrent flow or inversion heat exchange boundary, and when the boundary module is perpendicular to the flow channel to be detected, the boundary module is a cross flow heat exchange boundary. Therefore, by adjusting the installation position of the boundary module, the micro-channel heat exchange performance measurement under different boundary conditions can be performed by enabling the inner flow channel and the flow channel to be measured of the boundary module to be under a certain boundary condition.
Based on the experimental body provided by the embodiment, the micro-channel heat exchange performance measurement is carried out, and the method specifically comprises the following steps:
first, the assembly of the experimental body is completed. And then temperature sensors are arranged in the inlet and outlet connecting pipes of the core module, the inlet and outlet connecting pipes of each boundary module and the temperature measuring groove 5, pressure sensors are arranged at inlet positions of the two sides of the fluid working medium and the boundary working medium of the experimental body, and the experimental body with the measuring sensors is integrally put into a closed circulation loop and is provided with a flowmeter.
After the loop is started and each control instrument is regulated to achieve the design working condition and stable, the inlet and outlet temperatures, the running pressure, the running flow and the metal wall surface temperatures at the temperature measuring grooves along the path (namely along the flow direction of the working medium of the core module) of the fluid working medium in the core module can be obtained through the measuring instrument (namely each sensor), and meanwhile, the inlet and outlet temperatures of each boundary module can be obtained.
And finally, calculating the fluid temperature of the core module at the inlet and outlet positions of each boundary module by utilizing energy conservation, calculating the wall surface temperature of the fluid working medium at the same position by utilizing a heat conduction principle, and calculating the heat convection coefficient of the position by utilizing a heat convection formula, thereby obtaining the flow heat transfer characteristics of the heat exchange experiment body at a plurality of positions along the path.
As shown in FIG. 3, the temperature of the boundary working fluid at the inlet and outlet positions of the boundary module, t and t' can be measured w1 And t w2 For measuring the temperature of the metal wall of the thermocouple arranged on the tank 5, t b And t b ' are fluid working media in the core module respectively, and inlet and outlet fluid temperatures in the coverage range of the corresponding boundary module. The calculation method comprises the following steps:
t b the inlet temperature calculated from conservation of energy for the last border module is known. By measuring t and t' at this time, based on conservation of energy by heat exchange between the fluids on both sides, i.e
Wherein cp is 1 And cp (cp) 2 Specific heat capacities of boundary working medium and core working medium respectively are known, m 1 And m 2 The mass flow rates of the boundary working medium and the core working medium respectively belong to measured values, and t can be calculated according to the measured values b '。
Next according to t b And t b ' the along-path temperature distribution of the fluid in the core module (assuming essentially a linear distribution of the fluid temperature along the flow direction) can be obtained, and t can thus be obtained w1 And t w2 Core working fluid temperature t at corresponding location b1 And t b2 。
Meanwhile, the heat exchange heat flow density q corresponding to one boundary module can be obtained by dividing the heat exchange quantity by the heat exchange area, and the specific formula is as follows:
the numerator is the heat exchange quantity of the fluid at two sides, and the denominator is the heat exchange area S covered by a boundary module.
The formula for calculating the heat convection coefficient h is as follows:
at this time, the heat flux q is known, and the wall temperatures t at two positions w And fluid temperature t b By the method, the convection heat transfer coefficients h of two positions can be obtained, and the like, the convection heat transfer characteristics of each temperature measuring groove 5 on the heat exchange core body can be obtained, and the performance measurement of a plurality of positions of the micro-channel compact heat exchange experiment body to be detected can be completed.
The present embodiment also proposes a computer device for executing the above-described convective heat transfer characteristic calculation process of the present embodiment.
The computer device includes a processor, an internal memory, and a system bus; various device components, including internal memory and processors, are connected to the system bus. A processor is a piece of hardware used to execute computer program instructions by basic arithmetic and logical operations in a computer system. Internal memory is a physical device used to temporarily or permanently store computing programs or data (e.g., program state information). The system bus may be any of several types of bus structures including a memory bus or memory controller, a peripheral bus, and a local bus. The processor and the internal memory may communicate data via a system bus. The internal memory includes a Read Only Memory (ROM) or a flash memory (not shown), and a Random Access Memory (RAM), which generally refers to a main memory loaded with an operating system and computer programs.
Computer devices typically include an external storage device. The external storage device may be selected from a variety of computer readable media, which refers to any available media that can be accessed by a computer device, including both removable and fixed media. For example, computer-readable media includes, but is not limited to, flash memory (micro-SD card), CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer device.
The computer device may be logically connected to one or more network terminals in a network environment. The network terminal may be a personal computer, server, router, smart phone, tablet computer, or other public network node. The computer device is connected to a network terminal through a network interface (local area network LAN interface). Local Area Networks (LANs) refer to computer networks of interconnected networks within a limited area, such as a home, school, computer laboratory, or office building using network media. WiFi and twisted pair wired ethernet are the two most common technologies used to construct local area networks.
It should be noted that other computer systems including more or fewer subsystems than computer devices may also be suitable for use with the invention.
As described in detail above, the computer apparatus suitable for the present embodiment can perform the specified operation of the convective heat transfer characteristic calculation process. The computer device performs these operations in the form of software instructions that are executed by a processor in a computer-readable medium. The software instructions may be read into memory from a storage device or from another device via a lan interface. The software instructions stored in the memory cause the processor to perform the method of processing group member information described above. Furthermore, the invention may be implemented by means of hardware circuitry or by means of combination of hardware circuitry and software instructions. Thus, implementation of the present embodiments is not limited to any specific combination of hardware circuitry and software.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A modular microchannel compact heat exchange experimental body, comprising:
the core module is used for realizing that the fluid working medium flows through the flow channel to be tested and exchanges heat with the boundary module to finish the convective heat exchange process;
the boundary module is used for realizing the flow of boundary working media so as to provide different heat exchange boundary conditions for the core module, so as to finish the performance measurement of the core module under different boundary conditions;
the connecting assembly compresses and fixes the core module and the boundary module and guides working medium to enter and exit; the core module comprises a sealing plate to be tested and a runner plate to be tested;
a plurality of temperature measuring grooves are formed in the sealing plate to be measured in a working medium flowing mode, and the depth of each temperature measuring groove does not exceed the thickness of the sealing plate to be measured;
the flow channel plate to be tested is provided with a flow channel to be tested along the flow direction of the working medium, and the depth of the flow channel to be tested is not more than the thickness of the flow channel plate to be tested;
the sealing plate to be tested and the runner plate to be tested are provided with fixing holes and working medium inlets and outlets; the upper surface and the lower surface of the runner plate to be measured are respectively stacked with one sealing plate to be measured and welded into a whole, and one side of the two sealing plates to be measured with the temperature measuring grooves is far away from the runner plate to be measured;
the boundary module comprises a boundary sealing plate, a boundary runner plate and a compression sleeve;
the boundary runner plate is provided with a boundary runner, and the depth of the boundary runner is not more than the thickness of the boundary runner plate;
working medium inlets and outlets are formed in the boundary sealing plate and the boundary runner plate;
the boundary sealing plate and the boundary runner plate are stacked and welded into a whole, and one side of the boundary runner plate with the boundary runner is contacted with the boundary sealing plate;
the four compression sleeves are welded and fixed at four corners of the outer surface of the boundary sealing plate through bent metal rods with different heights, wherein two compression sleeves in the diagonal direction are in a group, and belong to the same height;
the boundary module is square in whole, and the side length is equal to the width of the core module but smaller than the length of the core module;
the plurality of boundary modules cover the upper surface and the lower surface of the core module, and two compression sleeves with different heights on two adjacent boundary modules are aligned with each other;
the connecting component comprises a compression stud, a compression nut, a connecting pipe and a hose;
the inlet and outlet holes of the core module and the boundary module are welded with connecting pipes; sequentially connecting a plurality of boundary modules through hoses, and sequentially connecting the boundary modules in series through connecting pipes at an inlet and an outlet;
the compression studs penetrate through the boundary module and the core module, and compression nuts are screwed at two ends of the compression studs so as to compress and fix the boundary module and the core module.
2. The modular microchannel compact heat exchange experimental body according to claim 1, wherein the end of the temperature measuring groove is arranged at the center of the sealing plate to be measured, the cross-sectional diameter of the temperature measuring groove is 1-5mm, and the cross-sectional shape of the temperature measuring groove is semicircular, rectangular or trapezoidal;
the diameter of the section of the flow channel to be measured is 1-5mm, and the section is semicircular, rectangular or trapezoidal;
the shape of the flow channel to be measured in the flowing direction of the working medium comprises a linear shape, a folded line shape, a streamline shape or an S-fin shape.
3. The modular microchannel compact heat exchange experimental body of claim 1, wherein,
each of the boundary modules can be rotatably installed at a preset angle to form different boundary conditions.
4. The modular microchannel compact heat exchange experimental body of claim 1, wherein,
the interface diameter of the boundary flow channel is 1-5mm, and the cross section is semicircular, rectangular or trapezoidal.
5. A method for measuring performance of a modular microchannel compact heat exchange experimental body according to any one of claims 1 to 4, comprising:
temperature sensors are arranged on the core module and the boundary module, and pressure sensors are arranged at inlet and outlet positions of the two sides of the fluid working medium of the core module and the boundary working medium of the boundary module;
placing the whole experimental body with the measuring sensor into a closed circulation loop and arranging a flowmeter;
after the loop is started and regulated to reach the design working condition and be stable, obtaining the inlet and outlet temperatures, the running pressure, the running flow, the metal wall temperatures at different positions along the path and the inlet and outlet temperatures of each boundary module by measuring the sensor;
and calculating the flow heat transfer characteristics of the experimental body at a plurality of positions along the path according to the measured data.
6. The performance measurement method according to claim 5, further comprising:
and the installation position of the boundary module is adjusted, so that the measurement of the heat exchange performance of the micro-channel under different boundary conditions is realized.
7. A data processing method based on a modular microchannel compact heat exchange experimental body according to any one of claims 1 to 4, comprising:
acquiring inlet and outlet temperatures, operating pressure, operating flow, metal wall temperatures at different positions along the path of the fluid working medium in the core module and inlet and outlet temperatures of each boundary module;
according to the conservation of energy of heat exchange between the fluids at two sides, calculating to obtain the outlet fluid temperature of the fluid working medium in the core module in the coverage range of the corresponding boundary module;
obtaining the along-path temperature distribution of the fluid in the core module according to the inlet and outlet fluid problems of the fluid working medium in the core module in the coverage range of the corresponding boundary module;
and calculating the heat convection coefficients of a plurality of positions along the core module according to the along-path temperature distribution of the fluid in the core module and the corresponding metal wall surface temperature.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the data processing method of claim 7 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the data processing method of claim 7.
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