CN111721435A - Temperature testing device and method for phase change energy storage material - Google Patents
Temperature testing device and method for phase change energy storage material Download PDFInfo
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- CN111721435A CN111721435A CN201910208926.2A CN201910208926A CN111721435A CN 111721435 A CN111721435 A CN 111721435A CN 201910208926 A CN201910208926 A CN 201910208926A CN 111721435 A CN111721435 A CN 111721435A
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
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Abstract
The invention discloses a temperature testing device and a testing method for a phase change energy storage material, wherein the temperature testing device comprises a temperature control device (1), a temperature data acquisition system (2), a container I (3) for containing a reference substance and a container II (4) for containing a phase change energy storage material to be tested.
Description
Technical Field
The invention belongs to the technical field of phase change energy storage materials, and particularly relates to a temperature testing device and a temperature testing method for a phase change energy storage material.
Background
In recent years, the phase change energy storage technology has gained more and more attention and development in the fields of renewable energy utilization, energy conservation, consumption reduction and the like, and the application thereof in heating, ventilation and air conditioning systems is more and more. The phase-change energy storage material used in the field of air conditioners is developed, cheap electric energy in low power consumption valleys can be converted into heat energy to be stored in the phase-change material, the heat is released in the peak power consumption, the power consumption in the peak period is reduced, and the effects of peak clipping and valley filling are achieved. In the currently known energy storage method, the solid-liquid phase change material has high heat storage density and stable phase change temperature, so that the solid-liquid phase change material is widely applied to heating, ventilating and air conditioning, solar heat storage, environment-friendly home furnishing and the like.
The inorganic phase change material has wide application range, and has relatively great phase change heat and fixed melting point. The crystalline hydrated salt has the advantages of large heat conductivity coefficient, high density, high heat storage density per unit volume and the like. However, most of the used inorganic materials are strong alkaline and corrosive substances, so that the temperature of the phase change energy storage material cannot be accurately measured in real time in the phase change process.
Disclosure of Invention
In order to overcome the problems, the inventor of the invention carries out intensive research and designs a phase change energy storage material temperature testing device, the device heats and cools a reference object and a phase change energy storage material to be tested through temperature control equipment, and measures and collects the temperatures of the reference object and the phase change energy storage material to be tested in real time through a temperature data collecting system to obtain a heating and cooling curve, so that a phase change temperature and supercooling degree interval of the phase change energy storage material to be tested is obtained.
The invention aims to provide a temperature testing device for a phase change energy storage material, which comprises a temperature control device and a temperature data acquisition system.
The device further comprises a container I and a container II, wherein the container I is used for containing a reference object, and the container II is used for containing the phase change energy storage material to be detected.
The temperature control equipment is used for heating the reference substance in the container I and the phase change energy storage material in the container II.
The temperature data acquisition system is provided with a temperature probe, preferably a temperature probe I and a temperature probe II, the temperature probe I is used for testing the temperature of the reference object, the temperature probe II is used for testing the temperature of the phase change energy storage material, and the temperature data acquisition system acquires the temperature measured by the temperature probe I and the temperature probe II.
Wherein the temperature control equipment is selected from water bath heating equipment, oil bath heating equipment or electromagnetic heating equipment.
The phase change energy storage material to be detected is an organic phase change energy storage material or an inorganic phase change energy storage material, preferably an inorganic phase change energy storage material, and more preferably an alkali substance or an inorganic salt.
Wherein the alkali substance is selected from one or more of sodium hydroxide, sodium hydroxide monohydrate, barium hydroxide octahydrate, barium hydroxide monohydrate, strontium hydroxide octahydrate and the like.
The inorganic salt is selected from one or more of aluminum sulfate dodecahydrate, sodium acetate trihydrate, aluminum sulfate heptahydrate, calcium chloride hexahydrate, aluminum potassium sulfate dodecahydrate, sodium sulfate decahydrate, potassium fluoride dihydrate, sodium acetate trihydrate, sodium thiosulfate pentahydrate, magnesium sulfate heptahydrate, sodium sulfate decahydrate, disodium hydrogen phosphate dodecahydrate, aluminum ammonium sulfate dodecahydrate, aluminum sulfate octadecahydrate and the like.
Another aspect of the present invention provides a method for testing the temperature of a phase change energy storage material according to the testing apparatus of the first aspect of the present invention, the method comprising the steps of:
and 4, closing the temperature control equipment and stopping heating.
In a further aspect of the invention, there is provided a use of the test apparatus according to the first aspect of the invention, preferably for testing the phase transition temperature and supercooling degree of an inorganic phase change energy storage material, more preferably for testing by the method according to the second aspect of the invention.
The invention has the following beneficial effects:
(1) the temperature testing device provided by the invention heats and cools the reference object and the phase-change energy storage material to be tested through the temperature control equipment, and measures and collects the temperatures of the reference object and the phase-change energy storage material to be tested in real time through the temperature data collecting system to obtain the heating and cooling trends, so that the phase-change process of the phase-change energy storage material is clearly reflected;
(2) the invention provides a new testing method for representing the phase change process and the supercooling degree of a phase change material;
(3) the temperature testing device has the advantages of simple structure, reasonable design and low cost, reduces the testing cost and is suitable for popularization and implementation;
(4) the test method for measuring the phase change energy storage material by adopting the temperature test device is simple and convenient to operate, clear in test principle, visual and accurate in measurement result, high in efficiency and suitable for popularization and implementation.
Drawings
Fig. 1 shows a temperature testing device of a phase change energy storage material according to a preferred embodiment of the present invention;
FIG. 2 shows temperature rise curves of glycerin and barium hydroxide octahydrate obtained in example 1 of the present invention;
FIG. 3 shows the cooling curves of glycerol and barium hydroxide octahydrate obtained in example 3 of the present invention.
The reference numbers illustrate:
1-temperature control equipment;
2-a temperature data acquisition system;
21-temperature measuring probe I;
22-temperature measuring probe II;
3-vessel I;
4-vessel II.
Detailed Description
The invention is explained in more detail below with reference to the drawings and preferred embodiments. The features and advantages of the present invention will become more apparent from the description.
The temperature testing device can measure the real-time temperature of the phase-change energy storage material in the processes of temperature rise and temperature drop, and observe the temperature change trend of the phase-change energy storage material, so that the phase-change process of the phase-change energy storage material is obtained.
According to the invention, the invention provides a temperature testing device for a phase change energy storage material, which comprises a temperature control device 1 and a temperature data acquisition system 2.
According to the invention, the device also comprises a container I3 and a container II 4, wherein the container I3 is used for containing the reference substance, and the container II 4 is used for containing the phase change energy storage material to be tested.
According to the invention, the container I3 and the container II 4 are sealable containers, and after the reference object or the phase change energy storage material to be tested is contained, the container I3 and the container II 4 are sealed in order to avoid the influence of the environment and the like.
According to the invention, containers I3 and II 4 may be flasks, preferably flasks with a condensate reflux device.
According to the invention, the temperature control device 1 is used for controlling the temperature of the container I3 and the container II 4, so that the temperature of the reference substance and the phase change energy storage material is controlled.
According to a preferred embodiment of the present invention, the temperature control device 1 includes a heating medium therein, and the temperature control device 1 controls the temperature of the heating medium by heating the heating medium.
According to the invention, the container I3 and the container II 4 are placed in a heating medium, the temperature control equipment heats the heating medium to enable the temperature of the reference object and the phase-change energy storage material to be measured to rise, and stops heating the heating medium to enable the temperature of the reference object and the phase-change energy storage material to fall.
According to the invention, the temperature control device 1 is a water bath heating device, an oil bath heating device or an electromagnetic heating device, such as a water bath, an oil bath or an electromagnetic heater.
According to another embodiment of the invention, the temperature control device 1 is a microwave heating device, the microwave heating device heats the reference substance in the container I3 and the phase change energy storage material to be tested in the container II 4 in a microwave heating manner, the reference substance and the phase change material to be tested are heated more uniformly in the microwave heating manner, and the cycle number of the phase change energy storage material to be tested can be increased.
According to the invention, the heating medium is silicone oil, water, paraffin, resistance wire or microwave.
According to the present invention, the temperature data acquisition system 2 is preferably an automatic temperature data acquisition system, the temperature data acquisition system 2 is provided with a temperature measuring probe, the temperature measuring probe can measure the temperature of the object to be measured by contacting with the object to be measured and transmit the measured temperature to the data acquisition system, the data acquisition system acquires and processes the obtained temperature data, and if the object to be measured is heated or cooled, a real-time temperature change curve, such as a temperature rise curve or a temperature decrease curve, of the object to be measured can be obtained.
According to the invention, more than two temperature probes, preferably two temperature probes, namely a temperature probe I21 and a temperature probe II22, are arranged on the temperature data acquisition system 2, wherein the temperature probe I21 extends into the container I3 and is in contact with the inside of a reference object to measure the real-time temperature of the reference object, and the temperature probe II22 extends into the container II 4 and is in contact with the inside of the phase change energy storage material to be measured to measure the real-time temperature of the inside of the phase change energy storage material to be measured.
According to the invention, the temperature probe I21 and the temperature probe II22 are temperature thermocouples, preferably K-type needle thermocouples, can directly measure temperature, and have the advantages of simple structure, wide measurement range, high precision and convenience for outputting signals remotely.
According to the invention, the temperature probe I and the temperature probe II are respectively fixed on the container I3 and the container II 4 by adopting a rubber plug and the like, preferably, the temperature probe I21 and the temperature probe II22 are inserted into a hole of the rubber plug and extend into a reference object and a phase change energy storage material to be tested, and meanwhile, sealing is realized, so that the test result is more accurate.
According to the present invention, after the temperature probe I21 and the temperature probe II22 are installed, the vessel I21 and the vessel II22 are sealed, and it is preferable that the vessel I21 and the vessel II22 are equipped with a reflux condenser.
According to the present invention, if the container I21 and the container II22 are flasks, the mouths of the flasks are sealed with rubber stoppers or glass stoppers, and preferably the mouths are coated with a sealant such as vaseline or the like.
According to the invention, the reference substance is a substance which has stable thermodynamic property, is not easy to decompose and has a high freezing point, such as glycerol, silicone oil and the like, and the selection of the reference substance is selected according to the phase change temperature of the phase change material to be measured, such as the melting temperature.
According to the invention, the phase change energy storage material to be tested is an inorganic phase change energy storage material or an organic phase change energy storage material, and is preferably an inorganic phase change energy storage material.
According to a further preferred embodiment of the present invention, the phase change energy storage material to be tested comprises an alkali substance or an inorganic salt. Wherein the alkali substance is selected from one or more of sodium hydroxide, sodium hydroxide monohydrate, barium hydroxide octahydrate, barium hydroxide monohydrate, strontium hydroxide octahydrate, etc.; the inorganic salt is preferably a crystalline hydrated salt, and is preferably one or more selected from aluminum sulfate dodecahydrate, aluminum potassium sulfate dodecahydrate, sodium sulfate decahydrate, potassium fluoride dihydrate, sodium thiosulfate pentahydrate, magnesium sulfate heptahydrate, sodium sulfate decahydrate, aluminum sulfate octadecahydrate, sodium acetate trihydrate, aluminum sulfate heptahydrate, disodium hydrogen phosphate dodecahydrate, sodium carbonate decahydrate, aluminum ammonium sulfate dodecahydrate, sodium acetate trihydrate, calcium chloride hexahydrate and the like.
According to a further preferred embodiment of the present invention, the phase-change energy storage material 7 to be tested further includes a nucleating agent, where the nucleating agent is selected from an organic nucleating agent and/or an inorganic nucleating agent, where the organic nucleating agent is an organic fiber nucleating agent, such as aramid fiber, polypropylene fiber, etc.; the inorganic nucleating agent is selected from one or more of sodium pyrophosphate, disodium hydrogen phosphate, sodium acetate, sodium sulfate, borax, barium sulfate, barium chloride, strontium chloride, barium hydroxide, calcium fluoride, sodium fluoride, nano silicon dioxide, nano titanium dioxide and the like. According to a further preferred embodiment of the present invention, the phase-change energy storage material to be tested further comprises a buffer, and the buffer is a saturated solution of an alkali substance or an inorganic salt.
According to the invention, the phase change energy storage material to be tested also comprises a thickening agent, wherein the thickening agent is selected from one or more of super absorbent resin, fumed silica, polyacrylamide, hydroxymethyl cellulose, bentonite, sodium polyacrylate, gelatin, xanthan gum, starch and guar gum. The thickening agent can change the viscosity of the solution, so that inorganic salt particles are relatively uniformly distributed in the solution, the deposition to the bottom is avoided, and the phase separation phenomenon can be overcome.
According to the invention, in order to avoid the influence on the nucleation efficiency caused by the fibrous nucleating agent floating on the upper layer of the liquid surface in the phase-change material, the fibrous nucleating agent can be wound on the bracket, and then the inorganic phase-change material, the buffering agent, the thickening agent and the like are refilled to obtain the phase-change energy storage material to be detected.
According to the invention, when the phase change temperature of the phase change energy storage material to be tested is lower than 120 ℃, glycerol can be selected as a reference substance.
According to the method, the phase change process of the phase change energy storage material to be detected is obtained through different temperature change trends of the reference substance and the phase change energy storage material to be detected, and then the supercooling degree interval of the phase change material is obtained.
In the invention, by heating the heating medium, the temperature of the reference substance in the container I3 and the temperature of the phase-change energy storage material to be detected in the container II 4 can change in the heating process, and the temperature data acquisition system 3 acquires and processes the temperatures detected by the temperature probe I21 and the temperature probe II22 at different times to obtain the temperature-rise curves of the reference substance and the phase-change energy storage material to be detected.
In the invention, the heating medium is cooled, preferably the heating medium is stopped, after the heating is stopped, the temperature of the reference substance and the phase-change energy storage material to be detected can change after the heating is stopped, and the temperature data acquisition system 2 acquires and processes the temperatures of the temperature probe I21 and the temperature probe II22 at different times to obtain the cooling curves of the reference substance and the phase-change energy storage material to be detected.
Another aspect of the present invention provides a use of the temperature testing apparatus for a phase change energy storage material according to the first aspect of the present invention for testing a phase change temperature and a supercooling degree of an inorganic phase change energy storage material.
In a further aspect of the present invention, there is provided a method for testing the temperature of a phase change energy storage material, preferably using the testing apparatus according to the first aspect of the present invention, the method comprising the steps of:
According to the invention, in step 1, a reference substance is added into the container I3, and the phase change energy storage material to be detected is added into the container II 4, wherein the adding mass of the reference substance and the adding mass of the phase change energy storage material to be detected are preferably equal.
And 2, extending the temperature measuring probe I21 and the temperature measuring probe II22 into the reference substance and the phase change energy storage material to be measured.
According to the invention, in the step 2, the temperature measuring probe I21 is extended into the reference object of the container I3 to test the temperature inside the reference object in real time, the temperature measuring probe II22 is extended into the phase change energy storage material to be tested to test the temperature inside the phase change energy storage material to be tested in real time, and the temperature measuring probe I21 and the temperature measuring probe II22 cannot contact the container wall, so that the temperature of the container wall is prevented from influencing the measured real-time temperature, and the measured real-time temperature is prevented from generating errors.
According to the invention, the temperature probe I21 and the temperature probe II22 are respectively fixed on the container I3 and the container II 4 by adopting a rubber plug and the like, preferably, the temperature probe I21 and the temperature probe II 4 are inserted into the hole of the rubber plug and extend into the reference substance and the phase change energy storage material to be tested, and meanwhile, the sealing is realized, so that the test result is more accurate.
According to the invention, in step 2, after the temperature probe I21 and the temperature probe II22 are installed, the container I3 and the container II 4 are sealed, and preferably, a condensation reflux device is installed on the container I3 and the container II 4.
According to the present invention, if the containers I3 and II 4 are flasks, the mouths of the flasks are sealed with rubber stoppers or glass stoppers, preferably by applying a sealant such as vaseline or the like to the mouths.
And 3, heating the container I3 and the container II 4 by adopting the temperature control equipment 1, and acquiring the temperature by using the temperature data acquisition system 2.
According to the invention, in step 3, the temperature control device 1 is adopted to heat the container I3 and the container II 4, and the heating temperature is determined according to the phase change temperature of the phase change energy storage material to be measured. Preferably, the heating temperature is higher than the melting temperature of the phase-change energy storage material to be detected, and more preferably, the heating temperature of the heating medium is higher than the melting temperature of the phase-change energy storage material to be detected by 10-100 ℃.
According to the invention, in step 3, when the reference object and the phase change energy storage material to be measured are heated, the temperature data acquisition system 3 collects and processes real-time temperature to obtain a temperature rise curve.
And 4, closing the temperature control equipment 1 and stopping heating.
According to the invention, in step 4, the temperature control device 1 is closed, the heating of the container I3 and the container II 4 is stopped, the temperature of the reference object and the phase change energy storage material to be measured is reduced, and the temperature data acquisition system 2 acquires and processes the temperature in real time to obtain a temperature reduction curve.
According to the invention, the phase change temperature and supercooling degree interval of the phase change energy storage material to be detected can be obtained through the temperature rise curve and the temperature drop curve of the phase change energy storage material to be detected.
In a further aspect of the invention, there is provided a use of the test apparatus according to the first aspect of the invention, preferably for testing the phase transition temperature and supercooling degree of an inorganic phase change energy storage material, more preferably for testing by the method according to the second aspect of the invention.
The testing device and the testing method can clearly reflect the phase change process of the phase change material, such as the melting process and the crystallization process of the inorganic salt, and the temperature change trend of the phase change material, provide a new method for representing the phase change process and the supercooling degree of the phase change material, such as the inorganic salt, and obviously reflect the phase change process and the supercooling degree interval of the inorganic salt. The temperature testing device for the phase change energy storage material provided by the invention has the advantages of simple structure, reasonable design and low cost, and the method for testing the temperature of the phase change energy storage material by using the testing device is simple and convenient, has high testing efficiency and accurate temperature measurement, and is suitable for popularization and implementation.
Examples
Example 1
Weighing 100g of glycerol as a reference substance and 100g of barium hydroxide octahydrate, and adding the glycerol and the barium hydroxide octahydrate into two flasks in a distributed manner;
two temperature measuring K-type thermocouples of a data acquisition system are extended into glycerol and barium hydroxide octahydrate for measuring the internal temperature of the glycerol and the barium hydroxide octahydrate, the two thermocouples are fixed by rubber plugs, the two flasks are sealed at the same time, then the two flasks are placed in an oil bath pot filled with silicone oil, the two flasks are heated to 100 ℃ through the oil bath pot, and the temperature is kept constant;
starting an automatic temperature data acquisition system when the oil bath kettle starts to heat, respectively testing the real-time temperature of the heating process of the glycerol and the barium hydroxide octahydrate by the two temperature thermocouples, and transmitting the measured data to the automatic temperature data acquisition system;
and closing the heating system of the oil bath pot, stopping heating the oil bath pot, and naturally cooling the two flasks in the oil bath. The two temperature thermocouples respectively test the real-time temperature of the cooling process of the glycerin and the barium hydroxide octahydrate and transmit the measured data to the automatic temperature data acquisition system.
The temperature rise curve of the glycerin and the barium hydroxide octahydrate obtained by processing the acquired data by the automatic temperature data acquisition system is shown in fig. 2, and the temperature reduction curve is shown in fig. 3.
As can be seen from FIG. 2, in the temperature rising process, along with the temperature rising, the temperature rising rate of the glycerol is high when the temperature is 0-30 min, the temperature gradually rises, after 40min, the temperature is basically maintained at 86 ℃, when the barium octahydrate hydroxide is 0-15 min, the temperature rapidly rises to 70 ℃, the temperature rising rate of the barium octahydrate hydroxide is greater than the temperature rising rate of the glycerol, then, when the temperature slowly rises after 15-45 min, when 45min, an inflection point appears on the temperature rising curve, which shows that the barium octahydrate hydroxide undergoes phase change at 78.13 ℃, and then, the temperature continues to rise, even is higher than the temperature of the glycerol.
As can be seen from FIG. 3, in the cooling process, the temperature of glycerol rapidly decreases, and barium hydroxide octahydrate begins to crystallize and precipitate solids when the temperature is 75min, energy is also released, and the temperature increases, and the supercooling temperature of the barium hydroxide octahydrate is 63.19 ℃, the highest temperature during phase change is 74.95 ℃, which indicates that the supercooling degree range of the barium hydroxide octahydrate is 63.19-74.95 ℃, and the supercooling degree is 11.76 ℃.
The invention has been described in detail with reference to the preferred embodiments and illustrative examples. It should be noted, however, that these specific embodiments are only illustrative of the present invention and do not limit the scope of the present invention in any way. Various modifications, equivalent substitutions and alterations can be made to the technical content and embodiments of the present invention without departing from the spirit and scope of the present invention, and these are within the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. The temperature testing device for the phase-change energy storage material is characterized by comprising a temperature control device (1) and a temperature data acquisition system (2).
2. The testing device according to claim 1, wherein the device further comprises a container I (3) for containing a reference substance and a container II (4) for containing the phase change energy storage material to be tested.
3. The testing device according to claim 1 or 2, wherein the temperature control device (1) is used for heating the reference substance in container I (3) and the phase change energy storage material to be tested in container II (4).
4. The testing device according to claim 1, wherein the temperature data acquisition system (2) is provided with a temperature probe, preferably a temperature probe I (21) and a temperature probe II (22), the temperature probe I (21) is used for testing the temperature of the reference object, the temperature probe II (22) is used for testing the temperature of the phase change energy storage material to be tested, and the temperature data acquisition system (2) acquires the temperatures measured by the temperature probe I (21) and the temperature probe II (22).
5. The test apparatus according to one of claims 1 to 4, characterized in that the temperature control device (1) is selected from a water bath heating device, an oil bath heating device or an electromagnetic heating device.
6. The testing device according to claim 2, wherein the phase change energy storage material to be tested is an organic phase change energy storage material or an inorganic phase change energy storage material, preferably an inorganic phase change energy storage material, and more preferably, the phase change energy storage material to be tested comprises an alkali substance or an inorganic salt.
7. The test device according to claim 2, wherein the alkali substance is selected from one or more of sodium hydroxide, sodium hydroxide monohydrate, barium hydroxide octahydrate, barium hydroxide monohydrate, strontium hydroxide octahydrate, and the like.
8. The test device of claim 2, wherein the inorganic salt is selected from one or more of aluminum sulfate dodecahydrate, sodium acetate trihydrate, aluminum sulfate heptahydrate, calcium chloride hexahydrate, aluminum potassium sulfate dodecahydrate, sodium sulfate decahydrate, potassium fluoride dihydrate, sodium acetate trihydrate, sodium thiosulfate pentahydrate, magnesium sulfate heptahydrate, sodium sulfate decahydrate, disodium hydrogen phosphate dodecahydrate, aluminum ammonium sulfate dodecahydrate, and aluminum sulfate octadecahydrate.
9. A method for testing the temperature of a phase change energy storage material according to the testing device of one of claims 1 to 8, wherein the method comprises the following steps:
step 1, respectively adding a reference substance and a phase change energy storage material to be detected into a container I (3) and a container II (4);
step 2, extending a temperature probe I (21) and a temperature probe II (22) into the reference substance and the phase change energy storage material to be detected;
step 3, heating the container I (3) and the container II (4) by adopting the temperature control equipment (1), and acquiring the temperature by using the temperature data acquisition system (2);
and 4, closing the temperature control equipment (1) and stopping heating.
10. Use of the test device according to one of claims 1 to 8, preferably for testing the phase transition temperature and supercooling degree of an inorganic phase change energy storage material, more preferably using the method of claim 9.
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