CN113203588B - Multi-stage gravity type self-flowing liquid working medium heat management performance testing system and method - Google Patents
Multi-stage gravity type self-flowing liquid working medium heat management performance testing system and method Download PDFInfo
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- CN113203588B CN113203588B CN202110451911.6A CN202110451911A CN113203588B CN 113203588 B CN113203588 B CN 113203588B CN 202110451911 A CN202110451911 A CN 202110451911A CN 113203588 B CN113203588 B CN 113203588B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses a system and a method for testing the heat management performance of a multi-stage gravity type self-flowing liquid working medium, wherein a first test pipeline of the system comprises a plurality of liquid storage devices, and a second test pipeline of the system comprises a sampling port, a temperature sensor, a water bath tank with the temperature sensor, a pressure test device and a heater with the temperature sensor; the first auxiliary testing pipeline comprises a flowmeter, a sampling port, a liquid level meter and a stirring device, and the second auxiliary testing pipeline comprises a power pump. The invention enables the working medium in the pipe to autonomously flow under the action of gravity to avoid the interference of an external mechanical or electric device, sets different heights of the liquid storage tanks to provide multi-level gravity to control the flow velocity of the working medium, and measures and samples the working medium through the temperature sensor and the sampling port on the first test pipeline.
Description
Technical Field
The invention belongs to the field of liquid working medium heat management performance testing, and particularly relates to a system and a method for testing the heat management performance of a multi-stage gravity type self-flowing liquid working medium.
Background
At present, more and more heat management technologies are applied in fields, such as automobile engine cabin heat management, airplane comprehensive mechanical system heat management, submarine cabin heat management, power battery heat management of electric automobiles and the like. After the thermal management technology is adopted, the temperature of the thermal management object can be in the control temperature range, so that the comfort of the cabin environment is obviously improved, the performance index of the thermal management object is improved, the service life of the thermal management object is prolonged, and the like. Because the heat management systems applied to different fields or occasions need to realize the heat management effect by depending on the working medium used by the heat management systems, the relationship between the performance of the heat management system and the working medium of the heat management system is important. Existing thermal management systems and methods are primarily air cooled, solid phase change material cooled and liquid circulation cooled. The air cooling is divided into natural air convection cooling and forced air convection cooling, the high-temperature surface or the high-temperature space is cooled by means of the flowing of air, and the working principle of the air cooling device is that convection heat exchange is carried out on cold air and the high-temperature surface or the high-temperature space, so that the cooling purpose is achieved. However, the heat capacity of air per unit volume is small, and the heat quantity which can be contained by the air per unit volume is limited, and the heat conduction performance of the air per se is poor, so that the heat management performance is poor no matter natural convection or forced convection of the air. Particularly, the heat generated by a power battery, an electronic chip and the like during working is large, and the air cooling and heat management performance is difficult to meet the requirements.
The cooling of the solid phase-change material in the heat management technology comprises pure phase-change material cooling and composite phase-change material cooling, and mainly means that the phase-change material is made into a shaped state, namely the phase-change material is compounded with shaped foam metal, a carbon frame or other materials with higher heat conductivity coefficients. The compounded material has great phase change heat storage capacity and excellent heat conducting performance. For example, the polymer network coated paraffin formed by combining the macromolecular olefin block copolymer with the carbon nanosheet by the learner has high heat conductivity and flexibility, and simultaneously overcomes the leakage problem. However, the fixed phase-change material is limited in fluidity, so that the application occasion is greatly limited, and the fixed phase-change material is not popularized in practical application.
The liquid cooling type heat management technology is that water or phase-change emulsion (including phase-change capsule emulsion) is used as a working medium, and the water and the phase-change emulsion have the advantages of good fluidity and large heat capacity to carry out heat management on a specific object. In particular, phase-change emulsions, which have both good flowability and a higher heat capacity than water, are increasingly being investigated as working substances for thermal management systems. The performance indexes of the heat management system taking the phase-change emulsion as the working medium are directly influenced by the performance of the emulsion (including temperature rise rate, heat conduction, heat storage, uniformity and the like), and the performance indexes of the accurate emulsion sample obtained by testing are crucial to evaluating the performance of the emulsion and further judging the performance of the heat management system based on the emulsion.
The existing system for testing the performance of the phase-change emulsion has the problems of low testing precision or unmatched testing sample and testing parameters, particularly, the temperature of the phase-change emulsion can be measured in real time and other performance indexes can be tested by sampling when the phase-change emulsion flows in a tube, and the prior art is difficult to realize. The existing testing technology mostly depends on an external power pump to enable emulsion to circularly flow in a pipe, and the performance of the phase-change emulsion is quantitatively compared by testing the performance of different working media. However, the pumping of the power pump and the rotation of the impeller not only can damage the structure of the emulsion to cause test difficulty, but also can increase the disturbance of the emulsion to cause the temperature of the emulsion to rise to cause the test data to be misaligned and increase the power consumption. In addition, the existing testing system or method mainly changes the flowing condition of the emulsion in the pipe by changing the power of the power pump, and the numerical values obtained by testing the same sample when the power is different can also be greatly different. Therefore, a system and a method for testing the thermal management performance of the working medium by means of controlling the flow speed by different gravity, which can avoid the interference of devices such as a power pump and the like, have high precision and can sample in real time when the working medium in the pipe flows, are still lacking at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a system and a method for testing the heat management performance of a multi-stage gravity type self-flowing liquid working medium. The test system of the invention enables the working medium in the pipe to naturally flow under the action of gravity of different sizes, can test the heat management performance and working condition of the working medium in the flow process, and mainly comprises a main test part and an auxiliary test part.
The invention adopts the following specific technical scheme:
in a first aspect, the invention provides a multi-stage gravity type self-flowing liquid working medium heat management performance test system, which comprises a first test pipeline, a second test pipeline, a first auxiliary test pipeline and a second auxiliary test pipeline, wherein the first test pipeline, the second test pipeline, the first auxiliary test pipeline and the second auxiliary test pipeline are sequentially connected in sequence and jointly form a circulation loop;
the first test pipeline comprises a plurality of liquid storage devices, and each liquid storage device is different in height from the first test pipeline and is communicated with the first test pipeline through a pipeline with a control valve;
the second test pipeline is a vertical pipeline, and the flow direction of working media in the pipeline is from top to bottom; along the flowing direction of the working medium, the second testing pipeline is sequentially provided with a first sampling port, a first temperature sensor, a water bath box with a second temperature sensor, a first pressure testing device, a third temperature sensor, a second sampling port, a heater with a fourth temperature sensor, a fifth temperature sensor, a second pressure testing device and a third sampling port;
along the flowing direction of working medium in the pipe, be equipped with first flowmeter, fourth sample connection, level gauge, second flowmeter, fifth sample connection and agitating unit on the first auxiliary test pipeline in proper order, be equipped with sixth sample connection, power pump and seventh sample connection on the second auxiliary test pipeline in proper order.
Preferably, the water bath tank is a constant temperature water bath tank, and the heater is a constant power heater.
Preferably, all the liquid storage devices are communicated through a pipeline with a control valve.
Preferably, all the sampling ports are respectively provided with a sampler.
Preferably, all the temperature sensors are respectively connected with the data acquisition instrument through data transmission lines, and signals acquired by the temperature sensors are displayed in real time through the data acquisition instrument.
Preferably, the heights of the liquid storage devices from the first test pipeline are gradually reduced along the flowing direction of the working medium.
Preferably, the first flow meter and the second flow meter are both electromagnetic flow meters.
Preferably, the stirring device is a stirring tank provided with a stirrer.
Preferably, the first pressure testing device and the second pressure testing device are both pressure transmitters.
In a second aspect, the invention provides a method for testing the heat management performance of a liquid working medium based on any one of the above multistage gravity type self-flowing liquid working medium heat management performance test systems, which specifically comprises the following steps:
according to the set flow rate value, enabling the liquid working medium to be tested to flow into a first test pipeline from a liquid storage device at the target height; the liquid working medium flows into a second test pipeline along the first test pipeline, flows from top to bottom in the second test pipeline under the action of gravity, and sequentially passes through a first sampling port, a first temperature sensor, a water bath box with the second temperature sensor, a first pressure test device, a third temperature sensor, a second sampling port, a heater with a fourth temperature sensor, a fifth temperature sensor, a second pressure test device and a third sampling port; the initial state of the liquid working medium is sampled and tested through the first sampling port, and the initial temperature of the liquid working medium is measured through the first temperature sensor; the liquid working medium is subjected to heat preservation treatment through the water bath tank, so that the initial temperatures of the liquid working medium entering the heater are the same, and the change condition of the liquid working medium in the water bath tank is monitored in real time through the second temperature sensor; the heater is used for simulating a target object to be subjected to heat management through the liquid working medium, and the temperature change condition of the liquid working medium flowing through the heater before and after flowing through the heater is monitored in real time through the fourth temperature sensor; measuring the pressure change condition before and after the liquid working medium flows through the heater through the first pressure testing device and the second pressure testing device; measuring the temperature change of the liquid working medium before and after flowing through the heater through a third temperature sensor and a fifth temperature sensor; sampling the liquid working medium through a second sampling port and a third sampling port to test the state change condition before and after the liquid working medium flows through the heater;
the liquid working medium flows out of the second test pipeline, enters the first auxiliary test pipeline, and sequentially passes through the first flowmeter, the fourth sampling port, the liquid level meter, the second flowmeter, the fifth sampling port and the stirring device; judging the flowing state of the liquid working medium in the first auxiliary test pipeline through the liquid level meter, and periodically starting the stirring device to avoid the liquid working medium from caking and condensing; the liquid working medium is pumped back into the first test pipeline through the second auxiliary test pipeline under the action of the power pump and is used for next measurement of the heat management performance index of the liquid working medium;
if the thermal management performance index of the liquid working medium can be obtained by measuring each device of the second test pipeline, each device on the first auxiliary test pipeline does not need to be started.
Compared with the prior art, the invention has the following beneficial effects:
1) according to the invention, a plurality of liquid storage devices with different heights are arranged on a first test pipeline to provide power for flowing of working media in the pipeline, and the flowing power of the working media is different and the flowing speeds of the working media are also different if the heights are different; the flow speed of the working medium is controlled by selecting a liquid storage device with a proper height so as to meet the required requirement.
2) The water bath tank is arranged in front of the heater, so that the temperature of the working medium entering the heater is kept consistent, the temperature inconsistency caused by heat loss ways such as heat dissipation and the like in the flowing process of the working medium is avoided, and the influence of external reasons on the heat management performance test of the working medium is reduced.
3) The invention simulates the object needing heat management by arranging the heater, can flexibly adjust the required heating temperature according to the different simulated objects, and can reflect the heat management performance of the working medium by monitoring the temperature change condition of the heater when the working medium flows through the heater.
4) The pipeline is provided with the plurality of sampling ports and the testing device, so that the performance indexes such as temperature, pressure and the like of working media at different positions can be measured in real time, and the performance indexes which cannot be directly measured can be obtained by sampling through the sampling ports and then measuring for the second time.
5) The stirring device is arranged, so that the working medium condensed into blocks can be uniformly stirred, and the working medium is prevented from blocking a pipeline.
6) The auxiliary test part can be selectively used according to needs, and when the working medium needs to be measured for the second time or the working medium needs to flow repeatedly, the auxiliary test part can be realized by virtue of the first auxiliary test pipeline and the second auxiliary test pipeline.
Drawings
FIG. 1 is an overall schematic of the system of the present invention;
FIG. 2 is a partial schematic view of the main test section of the present invention;
FIG. 3 is a partial schematic view of an auxiliary test section of the present invention;
the reference numbers in the figures are: 1-1 a first reservoir; 1-2 second liquid storage device; 1-3 a third liquid storage device; 1-4 a fourth reservoir; 2-1 a first control valve; 2-2 second control valve; 2-3 a third control valve; 2-4 fourth control valve; 2-5 a fifth control valve; 2-6 sixth control valve; 2-7 a seventh control valve; 3 a first test line; 4 a second test line; 5, a water bath tank; 6-1 a first pressure testing device; 6-2 a second pressure testing device; 7 a heater; 8 a first flow meter; 9 a liquid level meter; 10 liquid level scale; 11 a second flow meter; 12 stirring device, 13 stirrer; 14 a first auxiliary test line; 15 a second auxiliary test line; 16 power pump; 17 a temperature sensor; 18-1 a first data transmission line; 18-2 a second data transmission line; 18-3 a third data transmission line; 18-4 fourth data transmission lines; 18-5 a fifth data transmission line; 19-1 a first sampling port; 19-2 a second sampling port; 19-3 a third sampling port; 19-4 a fourth sampling port; 19-5 a fifth sampling port; 19-6 a sixth sampling port; 19-7 a seventh sample port; 20-1 a first sampler; 20-2 a second sampler; 20-3 a third sampler; 20-4 a fourth sampler; 20-5 a fifth sampler; 20-6 a sixth sampler; 20-7 a seventh sampler; 21 data acquisition instrument.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
As shown in fig. 1, the system for testing the thermal management performance of a multi-stage gravity type self-flowing liquid working medium provided by the present invention mainly comprises two parts, namely a main test part and an auxiliary test part. The main testing part comprises a first testing pipeline 3 and a second testing pipeline 4, the auxiliary testing part comprises a first auxiliary testing pipeline 14 and a second auxiliary testing pipeline 15, and the first testing pipeline 3, the second testing pipeline 4, the first auxiliary testing pipeline 14 and the second auxiliary testing pipeline 15 are sequentially connected end to end and jointly form a circulating loop.
As shown in fig. 2, the test system is a main test part of a multi-stage gravity type self-flowing liquid working medium thermal management performance test system. Be equipped with a plurality of stock solutions devices on first test pipeline 3, every stock solution device is all different apart from the height of first test pipeline 3, forms the stock solution subassembly that has certain height gradient jointly, and every stock solution device all is linked together with first test pipeline 3 through the pipeline that has the control valve. The working medium flows with different power and flow speed, so that the working medium can flow out from the liquid storage device with corresponding height according to the required working medium flow speed.
In this embodiment, four liquid storage devices may be provided, which are the first liquid storage device 1-1, the second liquid storage device 1-2, the third liquid storage device 1-3 and the fourth liquid storage device 1-4, and the heights between the first liquid storage device 1-1, the second liquid storage device 1-2, the third liquid storage device 1-3 and the fourth liquid storage device 1-4 and the first test pipeline 3 decrease in sequence. A second control valve 2-2 is arranged on a pipeline connecting the first liquid storage device 1-1 and the first test pipeline 3, a fourth control valve 2-4 is arranged on a pipeline connecting the second liquid storage device 1-2 and the first test pipeline 3, a sixth control valve 2-6 is arranged on a pipeline connecting the third liquid storage device 1-3 and the first test pipeline 3, a seventh control valve 2-7 is arranged on the first test pipeline 3 at the downstream of the fourth liquid storage device 1-4, and actually, a seventh control valve 2-7 can also be arranged on a pipeline connecting the fourth liquid storage device 1-4 and the first test pipeline 3. In order to make the operation of the system of the invention simpler and more convenient, all the liquid storage devices can be communicated with each other through a pipeline with a control valve, in the embodiment, a first control valve 2-1 is arranged on a communication pipeline between a first liquid storage device 1-1 and a second liquid storage device 1-2, a third control valve 2-3 is arranged on a communication pipeline between the second liquid storage device 1-2 and a third liquid storage device 1-3, and a fifth control valve 2-5 is arranged on a communication pipeline between the third liquid storage device 1-3 and a fourth liquid storage device 1-4. In practical application, a working medium to be measured can be placed into the first liquid storage device 1-1, if the height of the selected first liquid storage device 1-1 is not proper and the height needs to be reduced to reduce the flow rate of the working medium, the corresponding first control valve 2-1 is opened, the second control valve 2-2 is closed, and the working medium flows downwards along a pipeline to enter the second liquid storage device 1-2 of the next stage. If the height of the selected first liquid storage device 1-1 meets the requirement, the first control valve 2-1 is closed, the corresponding second control valve 2-2 and the corresponding seventh control valve 2-7 are opened, and the working medium enters the second test pipeline 4 from the first liquid storage device 1-1 along the first test pipeline 3. Similarly, when the selected height of the second liquid storage device 1-2 is still too high, the third control valve 2-3 is opened, so that the working medium enters the third liquid storage device 1-3 along the pipeline; and when the height of the selected second liquid storage device 1-2 meets the requirement, opening a fourth control valve 2-4 and a seventh control valve 2-7 to allow the working medium to enter a second test pipeline 4 from the second liquid storage device 1-2 along the first test pipeline 3. For other liquid storage devices with successively reduced heights, and so on, the detailed description is omitted.
The second test pipeline 4 is a vertical pipeline, so when the working medium enters the second test pipeline 4 along the first test pipeline 3, the working medium in the pipeline flows from top to bottom under the action of gravity. Along the flowing direction of the working medium, the second testing pipeline 4 is sequentially provided with a first sampling port 19-1, a first temperature sensor 17-1, a water bath box 5 with a second temperature sensor 17-2, a first pressure testing device 6-1, a third temperature sensor 17-3, a second sampling port 19-2, a heater 7 with a fourth temperature sensor 17-4, a fifth temperature sensor 17-5, a second pressure testing device 6-2 and a third sampling port 19-3.
In practical application, the water bath tank 5 can adopt a constant temperature water bath tank, and the heater 7 can adopt a constant power heater. For the convenience of sampling, each sampling port is provided with a sampler, that is, a first sampler 20-1 is arranged on the first sampling port 19-1, a second sampler 20-2 is arranged on the second sampling port 19-2, and a third sampler 20-3 is arranged on the third sampling port 19-3. Can carry out the sample test to intraductal working medium in real time through sample connection and supporting sampler, the switching can freely be controlled to the sampler that sets up on the sample connection, prevents that the sample from revealing. All the temperature sensors are respectively connected with a data acquisition instrument 21 through data transmission lines, and signals acquired by the temperature sensors are displayed in real time through the data acquisition instrument 21, namely, a first temperature sensor 17-1 is connected with the data acquisition instrument 21 through a first data transmission line 18-1, a second temperature sensor 17-2 is connected with the data acquisition instrument 21 through a second data transmission line 18-2, a third temperature sensor 17-3 is connected with the data acquisition instrument 21 through a third data transmission line 18-3, a fourth temperature sensor 17-4 is connected with the data acquisition instrument 21 through a fourth data transmission line 18-4, and a fifth temperature sensor 17-5 is connected with the data acquisition instrument 21 through a fifth data transmission line 18-5.
As shown in fig. 3, it is an auxiliary testing part of the multi-stage gravity type self-flowing liquid working medium thermal management performance testing system. Along the flowing direction of working media in the pipe, a first flowmeter 8, a fourth sampling port 19-4, a liquid level meter 9, a second flowmeter 11, a fifth sampling port 19-5 and a stirring device 12 are sequentially arranged on the first auxiliary testing pipeline 14. And a sixth sampling port 19-6, a power pump 16 and a seventh sampling port 19-7 are sequentially arranged on the second auxiliary test pipeline 15 along the flowing direction of the working medium in the pipeline. In practical applications, the first flow meter 8 and the second flow meter 11 may be electromagnetic flow meters, or may be other commercially available flow meters. The first pressure testing device 6-1 and the second pressure testing device 6-2 can be pressure transmitters or other commercially available pressure detection devices. The stirring device 12 may be a stirring tank structure having the stirrer 13, or may be another integrated stirring device. A fourth sampler 20-4 is arranged on the fourth sampling port 19-4, and a fifth sampler 20-5 is arranged on the fifth sampling port 19-5.
The method for testing the heat management performance of the liquid working medium by using the multistage gravity type self-flowing liquid working medium heat management performance test system comprises the following specific steps:
and according to the set flow rate value, the liquid working medium to be tested flows into the first test pipeline 3 from the liquid storage device with the target height. That is to say, because the fluid working medium speed that flows out from the stock solution device of different heights is different, consequently can select the stock solution device of certain height according to actual need, make the liquid working medium that awaits measuring flow out from the stock solution device of this height. The liquid working medium flows into the second testing pipeline 4 along the first testing pipeline 3, flows from top to bottom in the second testing pipeline 4 under the action of gravity, and sequentially passes through the first sampling port 19-1, the first temperature sensor 17-1, the water bath box 5 with the second temperature sensor 17-2, the first pressure testing device 6-1, the third temperature sensor 17-3, the second sampling port 19-2, the heater 7 with the fourth temperature sensor 17-4, the fifth temperature sensor 17-5, the second pressure testing device 6-2 and the third sampling port 19-3, and the specific steps are as follows:
the working medium firstly passes through the first sampling port 19-1 positioned at the top of the second testing pipeline 4, the working medium positioned at the position of the first sampling port 19-1 can be sampled by the first sampler 20-1 as required, and various performances are tested after the working medium is transferred (for example, a heat conductivity coefficient tester, a rheometer and the like are adopted to test the heat conductivity coefficient, the rheological property and the like of the sample), so that the initial state of the liquid working medium can be known conveniently. Subsequently, the first temperature sensor 17-1 at the lower part of the first sampling port 19-1 performs preliminary measurement on the temperature of the flowing working medium, and transmits data to the 21 data acquisition instrument through the first data transmission line 18-1, and the 21 data acquisition instrument acquires and records the initial temperature of the working medium tested by the first temperature sensor 17-1. The working medium then enters the water bath box 5 for temperature control and heat preservation treatment, so that the initial temperature of the liquid working medium entering the heater 7 is the same, the change condition of the liquid working medium in the water bath box 5 is monitored in real time through the second temperature sensor 17-2, and the second temperature sensor 17-2 transmits data to the data acquisition instrument 21 through the second data transmission line 18-2. The working medium with the temperature processed by the water bath box 5 continuously flows downwards through the first pressure testing device 6-1, the first pressure testing device 6-1 is used for testing the pressure of the working medium in the pipe, and the pressure is recorded after signal conversion. Under the action of gravity, the working medium in the second test pipeline 4 flows through the first pressure test device 6-1 and then flows through the third temperature sensor 17-3 at the lower part, the third temperature sensor 17-3 monitors and records the temperature of the working medium, and the temperature of the tested working medium is transmitted to the data acquisition instrument 21 through the third data transmission line 18-3 carried by the third temperature sensor. The lower part of the third temperature sensor 17-3 is provided with a second sampling port 19-2, and the working medium in the pipe flowing through the second sampling port 19-2 is sampled by a second sampler 20-2 and the performance of the testing working medium is transferred. When the working medium in the pipe flows through the second sampling port 19-2 and then enters the heater 7, the heater 7 is used for simulating a target object to be subjected to heat management through the liquid working medium, and the heat management working medium is used for carrying out heat management on the heat management object. The heater 7 is also provided with a fourth temperature sensor 17-4 for monitoring and recording the temperature of the heater 7, so that not only can the temperature of the heater 7 be prevented from being overhigh and the monitored temperature be stable, but also the temperature change condition of the heater 7 before and after the liquid working medium flows through the heater 7 can be monitored in real time, and the temperature measured in real time by the fourth temperature sensor 17-4 is transmitted to a 21 data acquisition instrument by a fourth data transmission line 18-4 and is recorded in real time. The working medium in the pipe flowing out of the heater 7 continuously flows downwards along the second test pipeline 4 and sequentially passes through the fifth temperature sensor 17-5, the second pressure test device 6-2 and the third sampling port 19-3. The fifth temperature sensor 17-5 records the temperature of the working medium flowing out of the heater 7, the temperature is transmitted to the 21 data acquisition instrument through the fifth data transmission line 18-5, the 21 data acquisition instrument records the temperature value, and the temperature change of the liquid working medium before and after flowing through the heater 7 is measured through the third temperature sensor 17-3 and the fifth temperature sensor 17-5. The second pressure testing device 6-2 tests the pressure of the working medium flowing out of the heater 7 after working, and the pressure change condition before and after the working medium in the pipe flows through the heater 7 can be obtained by comparing the values measured by the first pressure testing device 6-1 and the second pressure testing device 6-2. Working medium samples flowing out of the heater 7 after working can be obtained through the third sampling port 19-3 and the fourth sampler 19-4, performance indexes of the working medium after working can be obtained after indirect measurement, and whether the performance of the working medium changes or not and whether the structure is damaged or not can be known through comparison with initial data. At the moment, the main content of the working medium performance test is basically finished, and the working medium in the second test pipeline 4 flows under the action of gravity, so that the interference of other external components on the test result is avoided during measurement of various performance indexes of the working medium in the flowing process.
The liquid working medium flows out of the second testing pipeline 4, enters the first auxiliary testing pipeline 14, and sequentially passes through the first flowmeter 8, the fourth sampling port 19-4, the liquid level meter 9, the second flowmeter 11, the fifth sampling port 19-5 and the stirring device 12. The flowing state of the liquid working medium in the first auxiliary test pipeline 14 is judged through the liquid level meter 9, and the liquid working medium is prevented from caking and condensing by periodically starting the stirring device 12. The liquid working medium then enters the second auxiliary testing pipeline 15, passes through the sixth sampling port 19-6, the power pump 16 and the seventh sampling port 19-7 in sequence, and is sucked back into the first testing pipeline 3 through the second auxiliary testing pipeline 15 under the action of the power pump 16 for the next measurement of the heat management performance index of the liquid working medium. The method comprises the following specific steps:
the working medium entering the first auxiliary test pipeline 14 firstly enters the first flow meter 8, and the first flow meter 8 tests the initial flow of the working medium in the pipeline and is used as auxiliary data to explain the heat management performance of the working medium. Subsequently, the working fluid flowing out of the first flow meter 8 flows through the fourth sampling port 19-4 into the liquid level meter 9. The fourth sampler 20-4 on the fourth sampling port 19-4 can sample the working medium in the pipe in real time, and then the performance and the state of the working medium are evaluated by comparing a test result obtained by indirect test with initial test data. The liquid level meter 9 can mark the liquid containing condition of the working medium in the pipe through a liquid level scale 10 carried by the liquid level meter, and can provide a basis for evaluating whether the working medium normally flows. Working medium flowing out of the liquid level meter 9 passes through the second flow meter 11 along the first auxiliary testing pipeline 14, and the flow rate of the working medium tested by the second flow meter 11 is used for comparing the tested flow data with the data obtained by the first flow meter 8 so as to verify the accuracy of the flow test. In addition, when various heat management working media (such as water, phase change emulsion, inorganic salt solution and the like) sequentially flow through the tube, the readings of the two flowmeters are mutually verified to judge whether the working state of the flowmeters is normal. The fifth sampling port 19-5 is positioned between the second flowmeter 11 and the stirring device 12, the working medium flowing through the second flowmeter 11 needs to pass through the fifth sampling port 19-5 before entering the stirring device 12, and the fifth sampling device 20-5 on the fifth sampling port 19-5 can sample the working medium in the pipe in real time to carry out indirect testing. The stirrer 13 is arranged in the stirring device 12, and the working medium flowing into the stirring device 12 continuously flows along the first auxiliary test pipeline 14 to enter the second auxiliary test pipeline 15 after the stirring action of the stirrer 13. The purpose of providing the stirring device 12 on the first auxiliary test pipeline 14 is to easily block the pipeline when the working medium flowing in the pipeline is not pure water but unstable working media such as phase-change emulsion and the like which easily generate dispersed phase aggregation and the like, but the working medium stirred by the stirring device 12 can be uniformly dispersed again, so that the stable state of the working medium is maintained.
The working medium flowing out of the first auxiliary test pipeline 14 directly enters the second auxiliary test pipeline 15, and a sixth sampling port 19-6, a power pump 16 and a seventh sampling port 19-7 are sequentially arranged on the second auxiliary test pipeline 15 along the flowing direction of the working medium. The power pump 16 is located in the middle of the second auxiliary testing pipeline 15, working medium in the pipe flows through the sixth sampling port 19-6 along the second auxiliary testing pipeline 15 under the action of the power pump 16, and the working medium in the pipe can be sampled and tested in real time through the sixth sampler 20-6 on the sixth sampling port 19-6. The working fluid then enters the power pump 16 and continues to flow upward by the pumping action along the second auxiliary test line 15 and through the seventh sample port 19-7. The seventh sampling port 19-7 is provided with a seventh sampler 20-7, and the working medium in the pipe passing through the pump body of the power pump 16 can be sampled in real time through the seventh sampler 20-7 so as to test the structural integrity of dispersed phases in working media like phase-change emulsion and the like and judge whether the microstructure of the working medium is damaged. Under the action of the power pump 16, working medium in the pipe continuously flows upwards along the second auxiliary testing pipeline 15 through the seventh sampling port 19-7 and then enters the liquid storage tank through the first testing pipeline 3.
The first test line 3, the second test line 4, the first auxiliary test line 14 and the second auxiliary test line 15 thus together form a circulation circuit. It should be noted that if the thermal management performance index of the liquid working medium can be obtained by measurement through each device of the second test pipeline 4, each device on the first auxiliary test pipeline 14 does not need to be started. That is to say, the first auxiliary test pipeline 14 and the second auxiliary test pipeline 15 are selectively used, and working components on the first auxiliary test pipeline 14 and the second auxiliary test pipeline 15 are also selectively used, so that when the test devices on the first test pipeline 3 and the second test pipeline 4 are combined with parameters of a sample obtained by a sampling port and measured, most of working medium thermal management performance can be obtained, and working medium circulation flow and secondary measurement are not required, the first auxiliary test pipeline 14 and the second auxiliary test pipeline 15 are not required to be used.
Aiming at the defects of the existing testing equipment and method for the heat management performance of the liquid working medium, the invention enables the working medium in the pipe to automatically flow under the action of gravity to avoid the interference of an additional mechanical or electric device, sets different heights of the liquid storage tanks to provide multi-level gravity to control the flow velocity of the working medium, and measures and samples the working medium through a temperature sensor and a sampling port on a first testing pipeline. Any one of the multi-stage gravity liquid storage tanks is selected as a flowing starting point of the heat management working medium, the working medium flows through the water bath tank and is subjected to temperature correction to keep the initial temperature tested by the temperature sensor, the working medium flowing out of the water bath tank flows into the heater to carry out heat management on the heater, and the temperature of the heater is higher than that of the constant-temperature water bath tank, so that the effect of the heater is similar to that of an object to be subjected to heat management. The temperature sensor can acquire the temperature of working media at different positions in the pipe in real time, the pressure transmitter can acquire the pressure of the working media in the pipe at different positions in real time and calculate the flowing pressure drop and the flowing resistance of the working media, and the sampling in the pipe can be realized in real time through the sampling port to carry out secondary measurement. The main testing part can complete the testing of the main performance of the heat management working medium, and a matched auxiliary testing system is also needed when the working medium needs to circularly flow or repeatedly test. The auxiliary test system also comprises a first auxiliary test pipeline and a second auxiliary test pipeline, wherein the first auxiliary test pipeline is provided with a flowmeter, a liquid level meter, a sampling port and a liquid stirrer, and working medium in the pipeline flows into the first auxiliary test pipeline through the second test pipeline. Two flowmeters on the first auxiliary test pipeline can cooperate, ensure the test data accuracy, and the level gauge can then pass through the volume of liquid working medium in the liquid level gauge calibration pipe. The liquid stirrer on the first auxiliary test pipeline can uniformly stir the liquid flowing into the first auxiliary test pipeline, so that the test result is prevented from being interfered by the thickening or non-uniformity of the phase-change emulsion and other similar liquids. For example, because the phase-change emulsion has poor stability and is subject to coalescence and delamination after working for a period of time, resulting in poor fluidity, a stirrer needs to be started regularly to stir the phase-change emulsion to restore the original state. And a power pump is arranged on the second auxiliary test pipeline and used for conveying the working medium in the stirring tank to the multi-stage gravity liquid storage tank. Because the power pump is located the second auxiliary test pipeline middle part, consequently can not cause the interference to the test data on the second test pipeline.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (10)
1. A multi-stage gravity type self-flowing liquid working medium heat management performance test system is characterized by comprising a first test pipeline (3), a second test pipeline (4), a first auxiliary test pipeline (14) and a second auxiliary test pipeline (15), which are sequentially connected end to end and jointly form a circulation loop;
the first test pipeline (3) comprises a plurality of liquid storage devices, and each liquid storage device is different in height from the first test pipeline (3) and communicated with the first test pipeline (3) through a pipeline with a control valve;
the second test pipeline (4) is a vertical pipeline, and the flowing direction of working media in the pipeline is from top to bottom; along the flow direction of the working medium, the second testing pipeline (4) is sequentially provided with a first sampling port (19-1), a first temperature sensor (17-1), a water bath box (5) with a second temperature sensor (17-2), a first pressure testing device (6-1), a third temperature sensor (17-3), a second sampling port (19-2), a heater (7) with a fourth temperature sensor (17-4), a fifth temperature sensor (17-5), a second pressure testing device (6-2) and a third sampling port (19-3);
along the flowing direction of working media in the pipe, a first flowmeter (8), a fourth sampling port (19-4), a liquid level meter (9), a second flowmeter (11), a fifth sampling port (19-5) and a stirring device (12) are sequentially arranged on the first auxiliary testing pipeline (14), and a sixth sampling port (19-6), a power pump (16) and a seventh sampling port (19-7) are sequentially arranged on the second auxiliary testing pipeline (15);
the water bath tank (5) is a constant-temperature water bath tank, and the liquid working medium is subjected to heat preservation treatment through the water bath tank (5), so that the initial temperature of the liquid working medium entering the heater (7) is the same.
2. The system for testing the thermal management performance of the multi-stage gravity type self-flowing liquid working medium according to claim 1, wherein the heater (7) is a constant power heater.
3. The system for testing the thermal management performance of the multi-stage gravity type self-flowing liquid working medium according to claim 1, wherein all the liquid storage devices are communicated with one another through a pipeline with a control valve.
4. The system for testing the thermal management performance of a multi-stage gravity-type self-flowing liquid working medium according to claim 1, wherein a sampler is respectively arranged on all the sampling ports.
5. The system for testing the thermal management performance of the multi-stage gravity type self-flowing liquid working medium according to claim 1, wherein all the temperature sensors are respectively connected with the data acquisition instrument (21) through data transmission lines, and signals acquired by the temperature sensors are displayed in real time through the data acquisition instrument (21).
6. The system for testing the thermal management performance of the multi-stage gravity type self-flowing liquid working medium according to claim 1, wherein the heights of the liquid storage devices from the first test pipeline (3) are gradually reduced along the flowing direction of the working medium.
7. The system for testing the thermal management performance of the multi-stage gravity type self-flowing liquid working medium according to claim 1, wherein the first flowmeter (8) and the second flowmeter (11) are both electromagnetic flowmeters.
8. The system for testing the thermal management performance of the multi-stage gravity type self-flowing liquid working medium according to claim 1, wherein the stirring device (12) is a stirring tank provided with a stirrer (13).
9. The system for testing the thermal management performance of the multi-stage gravity type self-flowing liquid working medium according to claim 1, wherein the first pressure testing device (6-1) and the second pressure testing device (6-2) are pressure transmitters.
10. A method for testing the heat management performance of a liquid working medium based on the multi-stage gravity type self-flowing liquid working medium heat management performance testing system of any one of claims 1 to 9 is characterized by comprising the following steps:
according to the set value of the flow rate, the liquid working medium to be tested flows into a first test pipeline (3) from a liquid storage device with a target height; the liquid working medium flows into a second testing pipeline (4) along a first testing pipeline (3), flows from top to bottom in the second testing pipeline (4) under the action of gravity, and sequentially passes through a first sampling port (19-1), a first temperature sensor (17-1), a water bath box (5) with a second temperature sensor (17-2), a first pressure testing device (6-1), a third temperature sensor (17-3), a second sampling port (19-2), a heater (7) with a fourth temperature sensor (17-4), a fifth temperature sensor (17-5), a second pressure testing device (6-2) and a third sampling port (19-3); the initial state of the liquid working medium is sampled and tested through a first sampling port (19-1), and the initial temperature of the liquid working medium is measured through a first temperature sensor (17-1); the liquid working medium is subjected to heat preservation treatment through the water bath tank (5), so that the initial temperatures of the liquid working medium entering the heater (7) are the same, and the change condition of the liquid working medium in the water bath tank (5) is monitored in real time through the second temperature sensor (17-2); the heater (7) is used for simulating a target object to be subjected to heat management through the liquid working medium, and the temperature change conditions of the liquid working medium flowing through the heater (7) before and after the liquid working medium flows through the heater (7) are monitored in real time through the fourth temperature sensor (17-4); measuring the pressure change condition of the liquid working medium before and after flowing through the heater (7) through the first pressure testing device (6-1) and the second pressure testing device (6-2); measuring the temperature change of the liquid working medium before and after flowing through the heater (7) through a third temperature sensor (17-3) and a fifth temperature sensor (17-5); the liquid working medium is sampled through the second sampling port (19-2) and the third sampling port (19-3) so as to test the state change condition before and after the liquid working medium flows through the heater (7);
the liquid working medium flows out of the second testing pipeline (4), enters the first auxiliary testing pipeline (14), and sequentially passes through the first flowmeter (8), the fourth sampling port (19-4), the liquid level meter (9), the second flowmeter (11), the fifth sampling port (19-5) and the stirring device (12); the flowing state of the liquid working medium in the first auxiliary test pipeline (14) is judged through the liquid level meter (9), and the liquid working medium is prevented from caking and condensing by periodically starting the stirring device (12); the liquid working medium is pumped back into the first test pipeline (3) through a second auxiliary test pipeline (15) under the action of a power pump (16) and is used for the next measurement of the heat management performance index of the liquid working medium;
if the thermal management performance index of the liquid working medium can be obtained by measuring each device of the second test pipeline (4), each device on the first auxiliary test pipeline (14) does not need to be started.
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