CN111537548A - Phase change material melting-solidification cycle stability testing device - Google Patents
Phase change material melting-solidification cycle stability testing device Download PDFInfo
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Abstract
The invention discloses a phase change material melting-solidification circulation stability testing device, which controls the temperature of a phase change material to be tested through liquid heat exchange fluid, and comprises: the system comprises a first constant temperature tank, a second constant temperature tank, a heat exchange chamber, a first sample temperature sensor, a first circulating pipeline, a second circulating pipeline and a touch screen control system, wherein the first constant temperature tank and the second constant temperature tank are provided with heat exchange fluid; wherein, a plurality of sample chambers are arranged in the heat exchange chamber, and the phase-change material to be tested is arranged in the sample chambers; the first sample temperature sensor is arranged in the sample chamber and used for detecting the temperature of the phase-change material; the touch screen control system is connected with the first sample temperature sensor, the first constant temperature groove and the second constant temperature groove; the touch screen control system adjusts the temperature of the heat exchange fluid by controlling the temperatures of the first constant temperature tank and the second constant temperature tank, so that the temperature of the phase change material to be detected is controlled. The invention can effectively judge whether the phase-change material is completely melted or solidified, has accurate temperature control and short test period.
Description
Technical Field
The invention relates to an experimental device, in particular to a device for evaluating the circulation stability performance of a phase-change material, and more particularly relates to a device for testing the melting-solidification circulation stability of the phase-change material.
Background
The phase-change material can store or release a large amount of latent heat in the process of physical state transformation, so that the phase-change material is widely applied to the fields of building energy conservation, waste heat recovery, solar photo-thermal, electric power peak clipping and valley filling, equipment heat dissipation, battery heat management and the like. As the number of times of cold and hot circulation use of the phase change material is increased, the physicochemical property and the reliability of the phase change material are changed, the latent heat of phase change can be attenuated, and the test of the circulation stability of the phase change material is necessary. The evaluation of the cycle stability of the phase-change material is to analyze the change of performance parameters of the phase-change material after multiple melting-solidification by means of experiments, wherein the main parameters comprise the attenuation degree of latent heat value, the change conditions of phase-change temperature and supercooling degree and the like. The method for testing the circulation stability is mainly a manual method, and experimenters are required to manually switch the test samples from the high-temperature tank and the low-temperature tank, so that the method is time-consuming, labor-consuming and unsafe. The mature automatic products for testing the circulation stability of the phase-change material on the market are few, a high-low temperature alternating box for cooling or heating samples by using cold and hot air is professional equipment for testing temperature environment change parameters and performances of high-temperature, low-temperature, alternating-humidity-heat or constant tests of electronics, electricians and other products and materials, although the high-low temperature alternating box can also be used for testing the circulation stability of the phase-change material, the environment temperature of the alternating box can only be detected, each cycle needs to heat the environment temperature to a specified temperature, maintain the temperature for a certain time, cool the environment temperature to the specified temperature again, maintain the temperature for a certain time and perform reciprocating circulation, so that whether the phase-change material is completely melted or solidified cannot be effectively judged, the single cycle time is long, and the high-low temperature alternating box is not professional equipment for testing the circulation.
Disclosure of Invention
The invention aims to provide a device for testing the melting-solidification cycle stability of a phase-change material, which is used for solving the problems that the device for evaluating the cycle stability of the phase-change material in the prior art cannot effectively judge whether the phase-change material is completely phase-changed or not, the temperature control is inaccurate and the test period is long.
In order to achieve the above object, the present invention provides a device for testing melting-solidification cycle stability of a phase change material, wherein the device controls temperature of the phase change material to be tested by a liquid heat exchange fluid, and the device comprises: the system comprises a first constant temperature tank, a second constant temperature tank, a heat exchange chamber, a first sample temperature sensor, a first circulating pipeline, a second circulating pipeline and a touch screen control system, wherein the first constant temperature tank and the second constant temperature tank are provided with heat exchange fluid; the phase-change material to be tested is arranged in the sample chamber; the first sample temperature sensor is arranged in the sample chamber and used for detecting the temperature of the phase-change material; the heat exchange fluid in the first thermostatic bath enters or flows out of the heat exchange chamber through the first circulating pipeline, and the heat exchange fluid in the first thermostatic bath is used for heating the sample chamber; the heat exchange fluid in the second thermostatic bath enters or flows out of the heat exchange chamber through the second circulating pipeline, and the heat exchange fluid in the second thermostatic bath is used for cooling the sample chamber; the touch screen control system is connected with the first sample temperature sensor, the first constant temperature groove and the second constant temperature groove; the touch screen control system adjusts the temperature of the heat exchange fluid by controlling the temperatures of the first constant temperature tank and the second constant temperature tank, so that the temperature of the phase change material to be detected is controlled.
Preferably, the heat exchange fluid is water.
Preferably, the apparatus further comprises: the first electromagnetic valve is used for controlling the on-off of the first circulation pipeline, and the second electromagnetic valve is used for controlling the on-off of the second circulation pipeline.
Preferably, the phase-change temperature range of the phase-change material is 0-100 ℃.
Preferably, the sample chamber comprises: a reference sample chamber and more than two detection sample chambers; the first sample temperature sensor is arranged in the reference sample chamber.
Preferably, the apparatus further comprises: the temperature sensor is used for detecting the temperature of the phase-change material; the second sample temperature sensor is arranged in at least one detection sample chamber, the data acquisition instrument acquires the temperature signal of the second sample temperature sensor, stores the data of the temperature changing along with the time, and draws the heat accumulation/release curve in real time.
Preferably, the apparatus further comprises: and the computer is connected with the data acquisition instrument.
Preferably, the touch screen control system comprises: a touch screen; the touch screen is provided with a programmable control program and can be used for setting experimental conditions and displaying detection results.
Preferably, the sample chamber is detachably mounted in the heat exchange chamber.
Compared with the prior art, the invention has the beneficial effects that:
(1) the phase-change material is heated or cooled by the liquid medium, and compared with the traditional test box for cooling and heating the sample by cold and hot air, the phase-change material testing box has the advantages of higher heat exchange speed and more accurate temperature control.
(2) In the device, the heat exchange chamber is internally provided with the plurality of sample chambers, so that on one hand, parallel sample tests can be performed, on the other hand, comparison tests of different tests can be performed, and the sample chambers can be detached, so that the phase-change materials can be conveniently replaced without damaging the structure of the heat exchange chamber.
(3) The separation structure of the sample chamber and the heat exchange chamber avoids the phase-change material from contacting with the heat exchange pipeline, and prevents the phase-change material from being polluted.
(4) The phase-change material melting-solidification cycle stability testing device is strong in controllability and easy to maintain.
(5) The device can realize the automatic operation of the whole process of the melting-solidification cycle stability test of the phase-change material, and sets a control program according to the actual working condition.
(6) The device can effectively solve the problems of on-off, temperature acquisition and derivation and post-treatment of the heat transfer medium of the testing device.
(7) The device is provided with the first temperature sensor, the heating/cooling time of a single cycle does not need to be set, the heating/cooling time can be automatically adjusted according to the internal temperature of the phase-change material fed back by the first temperature sensor in real time in each cycle, whether the phase-change material is completely changed in phase can be effectively judged, the temperature of the phase-change material in each cycle can be guaranteed to reach the designated temperature, and the test period can be effectively shortened.
(8) The device is provided with the first constant temperature groove and the second constant temperature groove which are used as heat exchange and cold sources, the volume of the first constant temperature groove and the second constant temperature groove is far larger than that of the heat exchange chamber, after the heat exchange of the last circulation is finished, the temperature change of heat exchange fluid in the heat source and the cold source is not large, the heat exchange fluid in the constant temperature grooves can quickly impact a sample chamber in the heat exchange chamber when the next circulation is started, and the test period is further shortened.
Drawings
Fig. 1 is a schematic structural diagram of a phase-change material melting-solidification cycle stability testing apparatus according to the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Fig. 1 is a schematic structural diagram of a device for testing the melting-solidification cycle stability of a phase-change material according to the present invention. The device controls the temperature of the phase-change material to be measured through the heat exchange fluid. The device comprises: the device comprises a first constant temperature bath 1 and a second constant temperature bath 2 which are provided with heat exchange fluid, a heat exchange chamber 4, a first sample temperature sensor 18, a first circulating pipeline, a second circulating pipeline and a touch screen control system 3. Wherein, a plurality of sample chambers are arranged in the heat exchange chamber 4, and the phase-change material to be tested is arranged in the sample chambers; a first sample temperature sensor 18 is provided in the sample chamber for detecting the temperature of the phase change material. The heat exchange fluid in the first thermostatic bath 1 enters or flows out of the heat exchange chamber 4 through a first circulating pipeline, and the heat exchange fluid in the first thermostatic bath 1 is used for heating the sample chamber; the heat exchange fluid in the second thermostatic bath 2 enters or flows out of the heat exchange chamber 4 through a second circulating pipeline, and the heat exchange fluid in the second thermostatic bath 2 is used for cooling the sample chamber; the touch screen control system 3 is connected with the first sample temperature sensor 18, the first constant temperature bath 1 and the second constant temperature bath 2; the touch screen control system 3 adjusts the temperature of the phase change material in the sample chamber by controlling the temperature of the heat exchange fluid in the first constant temperature bath 1 and the second constant temperature bath 2.
The first constant temperature groove 1 and the second constant temperature groove 2 are used as heat exchange and cold sources, the volume of the first constant temperature groove and the second constant temperature groove is far larger than that of the heat exchange chamber, after the heat exchange of the last circulation is finished, the temperature change of heat exchange fluid in the heat source and the cold source is not large, the heat exchange fluid in the constant temperature grooves can quickly impact a sample chamber in the heat exchange chamber when the next circulation starts, and the test period is further shortened.
The phase-change material is heated or cooled by the liquid medium, and the heat exchange speed of the test box is higher than that of the traditional test box for cooling and heating a sample by cold and hot air, so that the test period is shorter. The traditional test box for cooling and heating the sample by using cold and hot air is slow in heat exchange speed, so that the sample cannot be heated or cooled to a set temperature in a short time, and inaccurate temperature control is caused.
In some embodiments, the heat exchange fluid is water. The first constant temperature groove 1 is used as a high-temperature constant-temperature heat source to heat the sample chamber by using water as a medium. The second constant temperature groove 2 is used as a low-temperature constant-temperature cold source and cools the sample chamber by using water as a medium. Other liquid materials can also be selected as the heat exchange fluid.
In some embodiments, the phase change material has a phase change temperature in the range of 0 to 100 ℃.
The apparatus of the present invention further comprises: the first electromagnetic valve is used for controlling the on-off of the first circulation pipeline, and the second electromagnetic valve is used for controlling the on-off of the second circulation pipeline.
The first circulating pipeline comprises a first water inlet pipeline 12 and a first water return pipeline 13, and the first electromagnetic valve comprises a high-temperature water inlet electromagnetic valve 8 and a high-temperature water return electromagnetic valve 9. The high-temperature water inlet electromagnetic valve 8 is arranged on a first water inlet pipeline 12, and the high-temperature water return electromagnetic valve 9 is arranged on a first water return pipeline 13. When the high-temperature water inlet electromagnetic valve 8 is opened, the heat exchange fluid flows into the heat exchange chamber 4 from the first thermostatic bath 1, and when the high-temperature water return electromagnetic valve 9 is opened, the heat exchange fluid flows back to the first thermostatic bath 1 from the heat exchange chamber 4. When a sample is heated, the high-temperature water inlet electromagnetic valve 8 and the high-temperature water return electromagnetic valve 9 are simultaneously opened, and the high-temperature heat exchange fluid continuously circularly flows between the first constant temperature groove 1 and the heat exchange chamber 4, so that the sample chamber is heated, and the phase change material placed in the sample chamber is further heated.
The second circulating pipeline comprises a second water inlet pipeline 14 and a second water return pipeline 15, and the second electromagnetic valve comprises a low-temperature water inlet electromagnetic valve 10 and a low-temperature water return electromagnetic valve 11. The low-temperature water inlet electromagnetic valve 10 is arranged on a second water inlet pipeline 14, and the low-temperature water return electromagnetic valve 11 is arranged on a second water return pipeline 15. When the low-temperature water inlet electromagnetic valve 10 is opened, the heat exchange fluid flows into the heat exchange chamber 4 from the second thermostatic bath 2, and when the low-temperature water return electromagnetic valve 11 is opened, the heat exchange fluid flows back to the second thermostatic bath 2 from the heat exchange chamber 4. When a sample is cooled, the low-temperature water inlet electromagnetic valve 10 and the low-temperature water return electromagnetic valve 11 are simultaneously opened, and the low-temperature heat exchange fluid continuously circularly flows between the second constant temperature groove 2 and the heat exchange chamber 4, so that the sample chamber is cooled, and the phase change material placed in the sample chamber is cooled.
In some embodiments, the sample chamber comprises: a reference sample chamber 5, and more than two detection sample chambers. For example, two detection sample chambers, a first detection sample chamber 6 and a second detection sample chamber 7, can be provided. A first sample temperature sensor 18 is provided in the reference sample chamber 5. The phase-change material put into the reference sample chamber 5 is the same as the phase-change material in the detection sample chamber, the actual temperature of the sample is detected by the first sample temperature sensor 18, whether the phase-change material is completely melted or solidified can be effectively judged, and the temperature control is accurate. The same phase-change material can be put into the first detection sample room 6 and the second detection sample room 7 as parallel samples, and phase-change materials with similar components and phase-change rules can be put into the second detection sample room 7 as comparison samples according to actual conditions.
In some embodiments, the apparatus further comprises: a data collector 16 and a second sample temperature sensor for detecting the temperature of the phase change material; the second sample temperature sensor is disposed within the at least one test sample chamber. For example, a second sample temperature sensor 21 is disposed in the first sample chamber 6 and a second sample temperature sensor 22 is disposed in the second sample chamber 7. The data collector 16 collects the temperature signal of the second sample temperature sensor, stores the data of the temperature change along with the time, and draws the heat accumulation/release curve in real time. The device further comprises: and a computer 17 connected with the data acquisition instrument 16. After the phase change material to be detected is put into the detection sample chamber, the temperature change of the material is detected through the second sample temperature sensor, the heat accumulation/release curve is drawn in real time through the acquisition instrument, and the curve graph is displayed on the computer 17.
The touch screen control system 3 includes: a touch screen; the touch screen is provided with a programmable control program and can be used for setting experimental conditions and displaying detection results. The setting of the experimental conditions includes setting the number of heating and cooling cycles of the phase change material, the temperature of the phase change material, and the like. The detection results include the temperatures of the first and second constant temperature chambers 1 and 2, the temperature detected by the first sample temperature sensor 18, and the like.
In some embodiments, a high temperature sensor 19 is disposed in the first constant temperature bath 1, a low temperature sensor 20 is disposed in the second constant temperature bath 2, and the high temperature sensor 19 and the low temperature sensor 20 are connected to the touch screen control system 3, so as to monitor the temperature of the heat exchange fluid in the constant temperature bath. The touch screen control system 3 can receive the temperature signal of the reference sample chamber 5 through the first temperature sensor 18, receive the water temperature signals of the super thermostatic bath 1 and the low-temperature thermostatic bath 2 through the high temperature sensor 19 and the low temperature sensor 20, and control the on-off of the first electromagnetic valve and the second electromagnetic valve according to a set program and temperature feedback.
In some embodiments, the sample chamber is removably mounted within heat exchange chamber 4.
The working principle of the invention is as follows: when the melting cycle is carried out, when the temperature of the reference sample chamber 5 is reduced to a certain set temperature below the freezing point, the low-temperature water inlet electromagnetic valve 10 and the low-temperature water return electromagnetic valve 11 are closed, the high-temperature water inlet electromagnetic valve 8 and the high-temperature water return electromagnetic valve 9 are opened, and the high-temperature heat exchange fluid in the first constant temperature tank 1 heats and melts the phase change materials in the 3 sample chambers in the heat exchange chamber 4 through the first water inlet pipeline 12 and the first water return pipeline 13. When the solidification cycle is carried out, when the temperature of the reference sample chamber 5 rises to a certain set temperature above the melting point, the high-temperature water inlet electromagnetic valve 8 and the high-temperature water return electromagnetic valve 9 are closed, the low-temperature water inlet electromagnetic valve 10 and the low-temperature water return electromagnetic valve 11 are opened, and the low-temperature heat exchange fluid in the second constant temperature tank 2 is cooled and solidified through the second water inlet pipeline 14 and the second water return pipeline 15. The invention realizes the heating/cooling of the sample chamber, automatically measures and judges the temperature of a high-temperature medium (high-temperature heat exchange fluid), a low-temperature medium (low-temperature heat exchange fluid) and a sample through the synergistic action of the temperature sensor, the electromagnetic valve and the touch screen control system, automatically switches the high-temperature medium and the low-temperature medium, and realizes the automation of all test periods. The device can be used for experimental research and teaching demonstration in colleges and universities and research institutes, and can also be popularized in relevant technologies.
Example 1
The melting-solidification cycle stability test device for the phase-change material is adopted to carry out melting-solidification cycle stability test on the phase-change material, and comprises the following steps:
step 1: starting a main switch of a touch screen control system, and setting test condition parameters including high-low temperature setting, cycle time setting, cold/hot start mode setting and the like;
step 2: starting a first constant temperature bath main switch and a circulation switch, and starting a second constant temperature bath main switch, a circulation switch and a refrigeration switch;
and step 3: clicking a starting button and clicking an impact starting button on a touch screen of the touch screen control system, and starting a phase change material melting-solidification cycle stability test until the set cycle times are completed;
and 4, step 4: and acquiring temperature signals of the first detection sample chamber and the second detection sample chamber by a data acquisition instrument at certain cycle times according to actual requirements, carrying out heat accumulation-release test by a computer, acquiring and storing data of temperature change along with time, and drawing a heat accumulation/release curve in real time.
The sample chamber only needs to be filled with a small amount (about tens of grams) of phase-change materials, is buried in the heat exchange chamber and is completely immersed in the heat exchange fluid, so that the heat exchange is more uniform and the heat exchange time is very short, the melting-solidification cycle times in unit time can be effectively improved, and the test efficiency is improved. In addition, the heat exchange fluid is not limited to water, can also be ethanol, heat conducting oil and the like, and can be selected and replaced according to the characteristics of the phase change temperature and the like of the material to be detected.
The phase-change material melting-solidification cycle stability testing device is strong in controllability and easy to maintain; the automatic operation of the whole process of the melting-solidification cycle stability test of the phase-change material can be realized, and a control program is set according to the actual working condition; the on-off, temperature acquisition, derivation and post-treatment of the heat transfer medium of the testing device can be effectively solved; whether the phase-change material is completely solidified or melted can be effectively judged according to the temperature feedback of the phase-change material, and the test period is shortened; the experimental device can be used for experimental research and teaching demonstration in colleges and universities and research institutes, and can also be used for related technology popularization.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. The utility model provides a phase change material melts-solidifies cycle stability testing arrangement which characterized in that, the device control the temperature through liquid heat transfer fluid to the phase change material that awaits measuring, the device contain: the system comprises a first constant temperature tank, a second constant temperature tank, a heat exchange chamber, a first sample temperature sensor, a first circulating pipeline, a second circulating pipeline and a touch screen control system, wherein the first constant temperature tank and the second constant temperature tank are provided with heat exchange fluid; wherein the content of the first and second substances,
a plurality of sample chambers are arranged in the heat exchange chamber, and the phase-change material to be detected is arranged in the sample chambers; the first sample temperature sensor is arranged in the sample chamber and used for detecting the temperature of the phase-change material;
the heat exchange fluid in the first thermostatic bath enters or flows out of the heat exchange chamber through the first circulating pipeline, and the heat exchange fluid in the first thermostatic bath is used for heating the sample chamber; the heat exchange fluid in the second thermostatic bath enters or flows out of the heat exchange chamber through the second circulating pipeline, and the heat exchange fluid in the second thermostatic bath is used for cooling the sample chamber;
the touch screen control system is connected with the first sample temperature sensor, the first constant temperature groove and the second constant temperature groove; the touch screen control system adjusts the temperature of the heat exchange fluid by controlling the temperatures of the first constant temperature tank and the second constant temperature tank, so that the temperature of the phase change material to be detected is controlled.
2. The apparatus for testing the melting-solidifying cycle stability of phase-change material according to claim 1, wherein the heat exchange fluid is water.
3. The apparatus for testing the melting-solidification cycle stability of a phase change material as claimed in claim 1, further comprising: the first electromagnetic valve is used for controlling the on-off of the first circulation pipeline, and the second electromagnetic valve is used for controlling the on-off of the second circulation pipeline.
4. The device for testing the melting-solidification cycle stability of the phase-change material as claimed in claim 1, wherein the phase-change temperature of the phase-change material is in a range of 0-100 ℃.
5. The apparatus for testing the melting-solidification cycle stability of a phase change material according to claim 1, wherein the sample chamber comprises: a reference sample chamber and more than two detection sample chambers; the first sample temperature sensor is arranged in the reference sample chamber.
6. The apparatus for testing the melting-solidification cycle stability of a phase change material as claimed in claim 5, further comprising: the temperature sensor is used for detecting the temperature of the phase-change material; the second sample temperature sensor is arranged in at least one detection sample chamber, the data acquisition instrument acquires the temperature signal of the second sample temperature sensor, stores the data of the temperature changing along with the time, and draws the heat accumulation/release curve in real time.
7. The apparatus for testing the melting-solidification cycle stability of a phase-change material as claimed in claim 6, further comprising: and the computer is connected with the data acquisition instrument.
8. The apparatus for testing the melting-solidification cycle stability of a phase-change material as claimed in claim 1, wherein the touch screen control system comprises: a touch screen; the touch screen is provided with a programmable control program and can be used for setting experimental conditions and displaying detection results.
9. The apparatus for testing the melting-solidification cycle stability of a phase-change material as claimed in claim 1, wherein the sample chamber is detachably installed in the heat exchange chamber.
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| CN202010471210.4A CN111537548A (en) | 2020-05-28 | 2020-05-28 | Phase change material melting-solidification cycle stability testing device |
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| CN116678914A (en) * | 2023-07-31 | 2023-09-01 | 河南新创业起重机械有限公司 | Device and method for testing thermal stability of phase change material for building |
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