A test section pipeline structure, heat exchange performance test system and test method

Abstract

The present invention relates to the technical field of heat exchange performance testing equipment, and its purpose is to provide a test section pipeline structure, a heat exchange performance testing system and a testing method. This test section pipeline structure can obtain the heat transfer coefficient of the fluid working medium under multiple working conditions in a single test, and the test efficiency is high. The above-mentioned test section pipeline structure includes a fluid working medium pipeline and a heat exchange pipeline; the fluid working medium pipeline is provided with a plurality of first test points at intervals along its extension direction; the heat exchange pipeline is wound around the fluid working medium pipeline, and a second test point is provided at a position on the heat exchange pipeline corresponding to each first test piece. The present invention solves the problem that the test system in the prior art obtains the heat transfer coefficient of the fluid working medium under multiple working conditions, and multiple tests are required, which has a long test time.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange performance testing equipment, and in particular to a test section pipeline structure, a heat exchange performance testing system and a testing method. Background Art

[0002] When testing the heat transfer performance of a fluid, the fluid is often condensed or evaporated, and the relevant parameters of the condensation or evaporation process are measured. Finally, the heat transfer coefficient is calculated through the experimental data. The heat transfer performance of the fluid can be calculated by statistically analyzing the data through multiple experiments.

[0003] In existing test systems, the test pieces are mostly of the sleeve type, with fluid passing through the inner tube and cooling water or heating water passing through the outer tube. The cooling water or heating water in the outer tube exchanges heat with the fluid to condense or evaporate and boil the fluid. The parameters of the fluid are measured from both ends of the test piece to obtain the heat transfer coefficient of the fluid under the working condition. However, the existing test system can only obtain the heat transfer coefficient of the fluid under one working condition each time. If you want to obtain the heat transfer coefficient of the fluid under multiple working conditions, you need to perform multiple tests, and each test requires adjustment of the parameters of other instruments. The test time is long, the test efficiency is low, and the accuracy of the test results is difficult to guarantee. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the test system in the prior art obtains the heat transfer coefficient of the fluid working medium under multiple working conditions, which requires multiple tests and has a long testing time, thereby providing a test section pipeline structure, a heat exchange performance testing system and a testing method that can obtain the heat transfer coefficient of the fluid working medium under multiple working conditions in a single test, with high testing efficiency and accuracy.

[0005] To this end, the present invention provides a test section pipeline structure, comprising:

[0006] A fluid working medium pipeline, wherein a plurality of first test points are arranged at intervals along an extending direction of the fluid working medium pipeline;

[0007] The heat exchange pipeline is wound around the fluid working medium pipeline, and second test points are arranged at positions on the heat exchange pipeline corresponding to the first test points.

[0008] Optionally, the heat exchange pipe has a plurality of protrusions protruding radially along the fluid working medium pipe, and the protrusions are located at the second test points.

[0009] Optionally, a heat exchange medium is introduced into the heat exchange pipe, and the distance between two adjacent protrusions along the flow direction of the heat exchange medium changes in an arithmetic progression.

[0010] Optionally, the heat exchange pipe is arranged in a U-shaped groove, and the protrusion is arranged above the open end of the U-shaped groove.

[0011] A heat exchange performance testing system comprises a fluid working medium circulation pipeline, wherein the fluid working medium circulation pipeline has a preheating section, a testing section and a supercooling section;

[0012] The preheating section is used to preheat the fluid working medium in the fluid working medium circulation pipeline to a state to be tested;

[0013] The test section is located downstream of the preheating section, and the test section is provided with the test section pipeline structure;

[0014] The supercooling section is located downstream of the testing section, and is used to supercool the tested fluid into a liquid state.

[0015] Optionally, the preheating section is provided with a heating pipe, and heating water is passed through the heating pipe; the supercooling section is provided with a supercooling pipe, and cooling water is passed through the supercooling pipe.

[0016] Optionally, the fluid working medium circulation pipeline includes an observation tube, and the observation tube is located between the test section and the supercooling section.

[0017] Optionally, the heat exchange performance testing system also includes an auxiliary component, which includes a driver, a filter and a pressure stabilizer. The driver is arranged between the supercooling section and the preheating section, and is used to drive the fluid working medium to circulate in the fluid working medium circulation pipeline. A sampling port is also arranged between the driver and the preheating section; the filter is arranged between the supercooling section and the driver, and the pressure stabilizer is arranged between the driver and the preheating section.

[0018] Optionally, the heat exchange performance testing system also includes a measuring component, which includes: a flow meter, a pressure gauge and a thermometer, the flow meter is arranged between the driving member and the preheating section, the pressure gauge and the thermometer are arranged between the driving member and the preheating section, and between the preheating section and the testing section.

[0019] A heat exchange performance testing method, applied to the above-mentioned heat exchange performance testing system, comprises:

[0020] Performing temperature tests on a plurality of first test points and a plurality of second test points in the test section pipeline structure to obtain temperature data of each test point;

[0021] The heat transfer coefficient of the fluid medium under the corresponding working condition is calculated by using the temperature data of two adjacent first test points and the corresponding two second test points. The heat transfer coefficient of the fluid medium under each working condition is calculated according to this step.

[0022] The present invention has the following advantages:

[0023] 1. In the test section pipeline structure provided by the present invention, the heat exchange pipeline is wound around the fluid working medium pipeline, and a plurality of first test points are arranged at intervals on the fluid working medium pipeline, and a plurality of second test points are correspondingly arranged on the heat exchange pipeline, and a working condition is defined between two adjacent test points. By measuring the plurality of first test points and the second test points, the heat transfer coefficient of the fluid working medium under a plurality of working conditions can be obtained, that is, the heat transfer coefficient of the fluid working medium under a plurality of working conditions can be obtained by a single test, and the test efficiency is high and the test results are relatively accurate.

[0024] 2. The test section pipeline structure provided by the present invention has a plurality of protrusions on the heat exchange pipeline that protrude radially along the fluid working medium pipeline, and the position of the protrusions is the second test point position. Since the protrusions protrude from the fluid working medium pipeline, it is convenient to set the test piece on the heat exchange pipeline and the fluid working medium pipeline, and convenient for testing operations.

[0025] 3. The test section pipeline structure provided by the present invention has a distance between two adjacent protrusions along the flow direction of the heat exchange medium that changes in an arithmetic progression, and when the heat exchange medium is heating water, it changes in an arithmetic decreasing manner, and when the heat exchange medium is cooling water, it changes in an arithmetic increasing manner. In this way, the test distance is adjusted as the state of the fluid working medium changes during the test, and the performance parameters under the expected working conditions can be obtained.

[0026] 4. The heat exchange performance test system provided by the present invention has a fluid working medium circulation pipeline with a preheating section, a test section and a supercooling section. The fluid working medium is heated to a state to be tested in the preheating section, and the test section can realize the test of heat exchange coefficients of multiple working conditions. Finally, the fluid working medium is condensed into a liquid state in the supercooling section for subsequent testing. This heat exchange performance test system has a simple structure, and the heat exchange coefficients of multiple working conditions can be obtained in one test. The test efficiency is high, and the fluid working medium can be recycled, saving test resources.

[0027] 5. In the heat exchange performance testing system provided by the present invention, an observation tube is provided between the test section and the supercooling section to facilitate observation of the state of the fluid working medium after the test.

[0028] 6. The heat exchange performance test system provided by the present invention can extract fluid samples through the sampling port between the driving part and the preheating section to ensure that the composition ratio of the fluid meets the test requirements and the accuracy of the test results. The system pressure can be adjusted by the voltage stabilizer to ensure flexible adjustment, safety and stability of the system pressure during the test.

[0029] 7. The heat transfer performance test method provided by the present invention includes performing temperature tests on each first test point and each second test point, and the heat transfer coefficient under this working condition can be calculated through the temperature data of two adjacent first test points and two second test points. By performing statistical calculations on the data of each test point, the heat transfer coefficient of the fluid working medium under multiple working conditions can be obtained, and only one test is required to obtain the heat transfer coefficient of the fluid working medium under multiple working conditions, and the test efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the test section pipeline structure of the present invention;

[0032] Figure 2 Schematic diagram of the heat exchange performance testing system of the present invention.

[0033] Description of reference numerals:

[0034] 1. Fluid working medium pipeline;

[0035] 2. heat exchange pipe, 201, protrusion;

[0036] 3. U-shaped groove;

[0037] 4. Fluid working medium circulation pipeline, 401, preheating section, 402, test section, 403, subcooling section, 404, observation tube, 405, sampling port;

[0038] 5. Heating pipes;

[0039] 6. Subcooling pipe;

[0040] 701, driving element, 702, filter, 703, voltage stabilizer;

[0041] 801. Flow meter, 802. Pressure gauge, 803. Thermometer. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] like Figure 1 As shown, it is a preferred embodiment of the test section pipeline structure of the present invention. This test section pipeline structure can be used to test the heat transfer coefficient of the fluid working medium, and the heat transfer coefficient of the fluid working medium under multiple working conditions can be obtained in a single test, and the test efficiency is high.

[0047] The test section pipeline structure includes: a fluid medium pipeline 1 and a heat exchange pipeline 2. The fluid medium to be tested is introduced into the fluid medium pipeline 1, and a plurality of first test points are arranged at intervals along the extension direction of the fluid medium pipeline 1. Specifically, in this embodiment, the fluid medium pipeline 1 is a micro-channel straight pipe.

[0048] The heat exchange pipe 2 is wound around the fluid working medium pipe 1, and a heat exchange medium is passed into the inside. The heat exchange medium can be heating water or cooling water, which can be selected according to whether the fluid working medium needs to evaporate, boil or condense during the test. A second test point is set at a position corresponding to each first test point on the heat exchange pipe 2, that is, the number of the first test point and the second test point is the same, and the positions correspond one to one. In this embodiment, the heat exchange pipe 2 is spirally wound around the fluid working medium pipe 1.

[0049] Furthermore, the heat exchange pipe 2 has a plurality of protrusions 201 protruding radially along the fluid working medium pipe 1, and the protrusions 201 are at the second test points, that is, the number of the protrusions 201 is consistent with the number of the second test points, and the number of the protrusions 201 is preferably 6-13. In addition, the distance between two adjacent protrusions 201 along the flow direction of the heat exchange medium in the heat exchange pipe 2 changes in an arithmetic progression.

[0050] Specifically, there are n protrusions 201 in total along the flow direction of the heat exchange medium. The distance between the first protrusion 201 and the second protrusion 201 is recorded as L1, the distance between the second protrusion 201 and the third protrusion 201 is recorded as L2, and so on. The distance between the last protrusion 201 (i.e., the nth protrusion 201) and the second to last protrusion 201 (i.e., the n-1th protrusion 201) is L n-1 , then L2-L1=L3-L2=……=L n-1 -L n-2 .

[0051] And when heating water is passed into the heat exchange pipe 2, the distance between two adjacent protrusions 201 decreases arithmetically. This is because as the evaporation and boiling process proceeds, the dryness of the fluid medium gradually increases, and the heat transfer coefficient gradually increases. Therefore, it is necessary to shorten it section by section to measure the expected operating performance; when cooling water is passed into the heat exchange pipe 2, the distance between two adjacent protrusions 201 increases arithmetically. This is because during the condensation process of the fluid medium, the dryness of the fluid medium gradually decreases, and the heat transfer coefficient gradually decreases. Therefore, it is necessary to increase it section by section to measure the expected operating performance.

[0052] Furthermore, the heat exchange pipe 2 is arranged in the U-shaped groove 3, and the protrusion 201 is arranged above the open end of the U-shaped groove 3, and tin-lead alloy or other types of alloys are melt-cast inside the U-shaped groove 3 to fix the heat exchange pipe 2 and the fluid working medium pipe 11, thereby ensuring the stability of the heat exchange pipe 2 and the fluid working medium pipe 1 during testing, and ensuring stable heat transfer between the heat exchange pipe 2 and the fluid working medium pipe 1.

[0053] When testing the fluid working medium, the test piece is set at the first test point and the second test point to test the temperature data. Specifically, the test piece is preferably a thermocouple, which is set at the second test point, i.e., the protrusion 201, and at the upper and lower sides of the first test point of the fluid working medium pipeline 1.

[0054] like Figure 2As shown, this embodiment also provides a heat exchange performance test system, including a fluid working medium circulation pipeline 4, and the fluid working medium circulation pipeline 4 has a preheating section 401, a test section 402 and a subcooling section 403. Among them, the preheating section 401 is used to preheat the fluid working medium in the fluid working medium circulation pipeline 4 to a state to be tested. Specifically, the preheating section 401 is provided with a heating pipe 5, and heating water is passed into the heating pipe 5. The fluid working medium in the preheating section 401 can be preheated by the heating water, so that the dryness, saturation temperature, mass flow rate, etc. of the fluid working medium reach the state to be tested.

[0055] The test section 402 is located downstream of the preheating section 401. The fluid preheated by the preheating section 401 reaches the test section 402 for testing. The test section 402 is provided with a test section pipeline structure. Since the test section pipeline structure is the same as the test section pipeline structure in the above embodiment, it will not be repeated.

[0056] The supercooling section 403 is located downstream of the test section 402, and is used to supercool the tested fluid medium into a liquid state. Specifically, the supercooling section 403 is provided with a supercooling pipe 6, and cooling water is passed through the supercooling pipe 6. The cooling water can condense the tested fluid medium into a liquid state for use in the next test.

[0057] Furthermore, the fluid working medium circulation pipeline 4 includes an observation tube 404, and the observation tube 404 is located between the test section 402 and the supercooling section 403. By providing the observation tube 404, the flow pattern state of the fluid working medium in the fluid working medium circulation pipeline 4 can be observed.

[0058] The heat exchange performance test system also includes auxiliary components, including a driver 701, a filter 702 and a regulator 703. The driver 701 is arranged between the supercooling section 403 and the preheating section 401. The driver 701 is used to drive the fluid working medium to circulate in the fluid working medium circulation pipeline 4. Specifically, in this embodiment, the driver 701 is a pump, which can drive the fluid working medium to circulate in one direction in the fluid working medium circulation pipeline 4. In addition, a sampling port 405 is also provided between the driver 701 and the preheating section 401. When the tested fluid working medium is a mixed working medium, a sample can be extracted at the sampling port 405 to detect the composition ratio of the sample to ensure the accuracy of the test result.

[0059] The filter 702 is disposed between the supercooling section 403 and the driving member 701 and is used to filter the fluid to ensure the normal operation of the driving member 701 .

[0060] The pressure regulator 703 is arranged between the driving member 701 and the preheating section 401, and is used to adjust the pressure of the system, and change the saturation temperature of the fluid working medium in the system through the change of pressure. Specifically, there is a diaphragm inside the pressure regulator 703, and the pressure inside the pressure regulator 703 can be changed by inflating and deflating the pressure regulator 703, and then the pressure in the test system is adjusted through pressure balance, so that the system reaches the expected test condition.

[0061] The heat exchange performance test system also includes a measuring component, which includes: a flow meter 801, a pressure gauge 802 and a thermometer 803. The flow meter 801 is arranged between the driving member 701 and the preheating section 401, and is used to measure the flow rate of the fluid working medium output by the driving member 701. A pressure gauge 802 and a thermometer 803 are arranged between the driving member 701 and the preheating section 401, and between the preheating section 401 and the test section 402, and are used to detect the pressure value and temperature of each part.

[0062] This embodiment also provides a heat exchange performance testing method, which is applied to the above-mentioned heat exchange performance testing system. Since the structure of the heat exchange performance testing system is the same as that of the heat exchange performance testing system described in the above-mentioned embodiment, it will not be described in detail.

[0063] The heat transfer performance test method includes the following steps:

[0064] Step S01, performing temperature tests on a plurality of first test points and a plurality of second test points in a test section pipeline structure to obtain temperature data of each test point;

[0065] This step also includes the preparation work before the test. Specifically, the driving member 701 is used to drive the fluid working medium to flow and enter the preheating section 401 for preheating, so that the fluid working medium reaches the state to be tested. Then, the fluid working medium enters the test section 402 from the preheating section 401. When performing the evaporation and boiling test, heating water is passed into the heat exchange pipe 2. When performing the condensation test, cooling water is passed into the heat exchange pipe 2. Before the test, the composition of the fluid working medium can be detected and confirmed through the sampling port.

[0066] Furthermore, a test piece is set at each first test point and second test point, and the temperature data at each test point is measured by the test piece (thermocouple). Along the flow direction of the fluid working medium, the multiple first test points in the test section pipeline structure are sequentially recorded as A1, A2, ... A n The temperature data measured at the first test points are recorded as T1, T2, ... T n ; Multiple second test points are recorded as B1, B2, ... B n The temperature data measured at the second test points are recorded as T1′, T2′, ... T n ′, where n is a positive integer.

[0067] Step S02, calculating the heat transfer coefficient of the fluid medium under the corresponding working condition through the temperature data of two adjacent first test points and the corresponding two second test points, and calculating the heat transfer coefficient of the fluid medium under each working condition according to this step.

[0068] Furthermore, between two adjacent first test points (or second test points), that is, one working condition, the heat transfer coefficient of the fluid medium under this working condition can be calculated by the temperature data at each starting test point and the temperature data at the end test point. Specifically, the working condition between A1 and A2 (i.e., between B1 and B2) can be recorded as working condition D1, and the heat transfer coefficient of the fluid medium under working condition D1 can be obtained by T1, T2, T1′, T2′. Similarly, the heat transfer coefficients from D1 to D n-1 The heat transfer coefficient of the fluid under any working condition, and only one test is required.

[0069] In addition, this step also includes processing the tested fluid medium. Specifically, the tested fluid medium flows from the test section 402 to the supercooling section 403, and the flow pattern of the fluid medium can be observed at the observation tube 404. The fluid medium changes into liquid after passing through the cold section 403, and after being filtered by the filter 702, it enters the driving member 701 for use in the next test.

[0070] During the entire test process, the system operation can be observed and detected through the measuring components, and the system pressure can be adjusted through the voltage stabilizer.

[0071] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A heat exchange performance testing system, characterized in that: It comprises a fluid working medium circulation pipeline (4), wherein the fluid working medium circulation pipeline (4) has a preheating section (401), a testing section (402) and a supercooling section (403); The preheating section (401) is used to preheat the fluid working medium in the fluid working medium circulation pipeline (4) to a state to be tested; The test section (402) is located downstream of the preheating section (401), and the test section (402) is provided with a test section pipeline structure; The supercooling section (403) is located downstream of the testing section (402) and is used to supercool the tested fluid into a liquid state; The test section pipeline structure comprises: a fluid working medium pipeline (1) and a heat exchange pipeline (2); The fluid working medium pipeline (1) is provided with a plurality of first test points at intervals along its extension direction; The heat exchange pipe (2) is wound around the fluid working medium pipe (1), and second test points are arranged at positions on the heat exchange pipe (2) corresponding to the first test points; The heat exchange pipe (2) has a plurality of protrusions (201) protruding radially along the fluid working medium pipe (1), and the protrusions (201) are located at the second test points; A heat exchange medium is introduced into the heat exchange pipe (2), and the distance between two adjacent protrusions (201) along the flow direction of the heat exchange medium changes in an arithmetic progression.

2. The heat exchange performance testing system according to claim 1, characterized in that: The heat exchange pipe (2) is arranged in the U-shaped groove (3), and the protrusion (201) is arranged above the open end of the U-shaped groove (3).

3. The heat exchange performance testing system according to claim 1, characterized in that: The preheating section (401) is provided with a heating pipe (5), and heating water is passed into the heating pipe (5); the supercooling section (403) is provided with a supercooling pipe (6), and cooling water is passed into the supercooling pipe (6).

4. The heat exchange performance testing system according to claim 1, characterized in that: The fluid working medium circulation pipeline (4) comprises an observation tube (404), and the observation tube (404) is located between the test section (402) and the supercooling section (403).

5. The heat exchange performance testing system according to claim 1, characterized in that: The invention also comprises an auxiliary component, wherein the auxiliary component comprises a driving member (701), a filter (702) and a voltage stabilizer (703); the driving member (701) is arranged between the supercooling section (403) and the preheating section (401); the driving member (701) is used to drive the fluid working medium to circulate in the fluid working medium circulation pipeline (4); a sampling port (405) is also arranged between the driving member (701) and the preheating section (401); the filter (702) is arranged between the supercooling section (403) and the driving member (701); and the voltage stabilizer (703) is arranged between the driving member (701) and the preheating section (401).

6. The heat exchange performance testing system according to claim 5, characterized in that: The device also includes a measuring component, which includes: a flow meter (801), a pressure gauge (802) and a thermometer (803); the flow meter (801) is arranged between the driving member (701) and the preheating section (401); the pressure gauge (802) and the thermometer (803) are arranged between the driving member (701) and the preheating section (401), and between the preheating section (401) and the testing section (402).

7. A heat exchange performance testing method, applied to the heat exchange performance testing system according to any one of claims 1 to 6, characterized in that: include: Performing temperature tests on a plurality of first test points and a plurality of second test points in the test section pipeline structure to obtain temperature data of each test point; The heat transfer coefficient of the fluid medium under the corresponding working condition is calculated by using the temperature data of two adjacent first test points and the corresponding two second test points. The heat transfer coefficient of the fluid medium under each working condition is calculated according to this step.

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