A device for testing heat storage performance of a phase change material and a testing method thereof

Abstract

The application discloses a kind of phase change material heat storage performance testing device and testing method thereof, the testing device is by vacuum measurement box, heat flow meter I, data acquisition instrument, cold end pipeline, cold water tank, hot water tank, circulating pipeline, circulating pump I, bottom plate, hot end pipeline, circulating pump II, heat flow meter II, pressure relief button, lever support, top cover lever, vacuum pump and the like part composition, the testing method is by preparing sample to be measured, initialization testing device, setting experimental gas pressure, setting test temperature and preheating device, start heat storage performance test, restore initial state and read test data 7 step composition.The application structure is simple, easy and fast to operate, test principle is clear, test is accurate and cost is lower, can efficiently carry out heat storage performance test to phase change material and directly reflect the specific parameters of phase change material heat storage performance through test, suitable for application and popularization in actual production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phase change heat storage, in particular to a phase change material heat storage performance testing device and a testing method thereof. BACKGROUND

[0002] Phase change heat storage technology is to use the characteristics of phase change materials to release or absorb a large amount of heat when the material changes phase, and the material temperature is at or tends to be at an isothermal state, so as to realize the storage and utilization of heat energy. Phase change heat storage technology has wide application, and can be applied to the storage of time-dependent energy sources such as solar energy and valley electricity, and the storage of environment-dependent energy sources such as geothermal energy and industrial waste heat. The basis of phase change heat storage technology is the selection of phase change materials, and the heat storage performance of phase change materials such as phase change latent heat, heat storage density and thermal conductivity deeply affects the further development of phase change heat storage technology. Excellent phase change materials can efficiently convert excess energy with time and environmental dependence into stored heat energy, so as to facilitate the transfer and re-release of heat energy, which plays an important role in energy saving and emission reduction and improving energy utilization.

[0003] At present, the testing of the heat storage performance of phase change materials at home and abroad is generally carried out under laboratory conditions, and the heat storage performance of phase change materials is evaluated by systematically testing the thermodynamic properties of phase change materials by using differential scanning calorimeter, thermal gravimetric analyzer or simultaneous thermal analyzer and other equipment. However, the above method is complicated and has poor pertinence, and needs to be systematically tested to evaluate the heat storage performance of phase change materials, and at the same time, the related equipment is expensive, and the cost of testing the heat storage performance of phase change materials is high.

[0004] In summary, the testing of the heat storage performance of phase change materials is crucial to phase change heat storage technology, and there is an urgent need for a technical solution to simplify the testing process of the heat storage performance of phase change materials, which has strong pertinence and low cost, and provides reference and support for the practical production and application of phase change materials. SUMMARY

[0005] The present application aims to design a phase change material heat storage performance testing device and a testing method thereof, which avoids the shortcomings of complicated operation, poor pertinence and high cost of the existing testing method, and has simple structure, convenient and fast operation, accurate testing and low cost, realizes efficient testing of phase change materials, and obtains the heat storage performance parameters of various phase change materials, thereby providing support for the further development of phase change heat storage technology.

[0006] The present application is realized by the following technical solutions:

[0007] The utility model provides a kind of phase change material heat storage performance testing device, including vacuum measuring box, hot water tank and cold water tank, the water outlet of the vacuum measuring box is connected with the cold water tank by cold end pipeline, and heat flow meter I is arranged between the water outlet of the vacuum measuring box and the cold water tank, the water inlet of the vacuum measuring box is connected with the hot water tank by hot end pipeline, and heat flow meter II and circulating pump II are arranged between the water inlet of the vacuum measuring box and the hot water tank, heating heat source and thermocouple I are installed in the hot water tank, the other end of the hot water tank is connected with the other end of the cold water tank by circulating pipeline, circulating pump I, the other end of the vacuum measuring box is connected with vacuum pump by exhaust pipeline, lever support is fixed on the upper end of the vacuum measuring box, top cover lever is hinged with the lever support, top cover is hinged with the top cover lever, locking bolt is movably matched in the through-hole of the front end of the top cover lever, locking pad is fixed on the upper end of the vacuum measuring box, pressure relief button is installed in the through-hole on the upper end of the vacuum measuring box, and O-shaped sealing ring is embedded in the annular groove on the upper end of the vacuum measuring box.

[0008] It also includes a container to be measured, an L-shaped slider, a guide optical axis, and an inner spiral heat exchanger. The container to be measured is fitted on the L-shaped slider, which is movably fitted on the guide optical axis through a linear bearing. A magnet I is installed below the L-shaped slider. The guide optical axis is fixed on the inner wall of the vacuum measuring box through flanges at both ends. The inner spiral heat exchanger is fixed above a heat exchange base. A magnet II is installed below the inner spiral heat exchanger. The water inlet of the inner spiral heat exchanger is connected to the water inlet of the vacuum measuring box. The water outlet of the inner spiral heat exchanger is connected to the water outlet of the vacuum measuring box. The heat exchange base is fixed on the guide optical axis.

[0009] It also includes a rudder, a release device, and a drive spring. The rudder is fixed on the release device, which is fixed on the inner wall of the vacuum measuring box. The drive spring is matched with the guide optical axis.

[0010] It also includes a data acquisition instrument. The data acquisition instrument is connected to a thermocouple II, the thermocouple I, the rudder, the heat flow meter I, and the heat flow meter II through wires. The thermocouple II is installed at the bottom of the container to be measured. The data acquisition instrument is connected to a computer through wires.

[0011] It also includes a base plate. The vacuum measuring box, the hot water tank, the cold water tank, the data acquisition instrument, the circulating pump I, the circulating pump II, and the vacuum pump are fixed on the base plate.

[0012] Preferably, the locking bolt and the locking pad are threadedly matched.

[0013] Preferably, the inner spiral heat exchanger has a hollow pipeline arranged in a spiral pattern inside the wall surface.

[0014] Preferably, a groove I is provided above the L-shaped slider, and an elastic buckle I is provided on the container to be tested, and the elastic buckle I cooperates with the groove I.

[0015] Preferably, two dovetail grooves are provided on the L-shaped sliding block, and a dovetail track is provided on the container to be tested, and the dovetail grooves match the dovetail track.

[0016] Preferably, a groove II is provided at the bottom of the L-shaped slider, and the releaser is provided with an elastic buckle II. The elastic buckle II cooperates with the groove II to compress the drive spring to store energy, forming a test state; the servo rotates to press down the elastic buckle II on the releaser, and the drive spring provides elastic force to make the L-shaped slider slide along the guide light axis and be adsorbed by the magnet I and the magnet II, so that the L-shaped slider cooperates with the inner spiral heat exchanger to form a released state.

[0017] Preferably, the two guide light axes are mounted on the inner wall of the vacuum measuring box in a mirror-symmetrical manner through the flange seat, the two linear bearings that are movably engaged with the guide light axes are fixed to the bottom of the L-shaped slider in a mirror-symmetrical manner, and the two driving springs are coaxially engaged with the two guide light axes respectively.

[0018] A method for testing a phase change material heat storage performance testing device comprises the following steps:

[0019] Step 1: Prepare the sample to be tested: take the container to be tested from the vacuum measurement box, and place a known mass of the phase change material to be tested in the container to be tested. Specifically, the phase change material to be tested is a solid-solid phase change material or a solid-liquid phase change material, and the mass of the phase change material to be tested is not more than 800g of the rated test mass of the device; Step 2: Initialize the test device: inject a certain volume of distilled water into the hot water tank; the test container is fitted on the L-shaped slider of the vacuum measurement box through the dovetail groove, and is fixed on the L-shaped slider through the elastic buckle I and the groove I; the L-shaped slider and the releaser are matched through the elastic buckle II and the groove II, so that the driving spring is in a compressed energy storage state; the locking bolt and the locking pad are matched through the thread and are tightened, so that the top cover is pressed against the O-shaped sealing ring on the upper end surface of the vacuum measurement box, and the sealing of the vacuum measurement box is realized. Specifically, the volume of distilled water injected is not less than 10L of the rated capacity of the hot water tank, and not more than 15L of the maximum capacity of the hot water tank, and the distilled water can be replaced with a heat exchange medium with a higher boiling point in time according to the phase change temperature of the phase change material to be tested; Step 3: Set the experimental air pressure: set the experimental air pressure, and the computer controls the vacuum pump to be started, so that the air in the vacuum measurement box is pumped out through the exhaust pipe by the vacuum pump, and when the internal air pressure is reduced to the experimental air pressure, the computer controls the vacuum pump to stop working; when the internal air pressure is greater than the experimental air pressure, the computer controls the vacuum pump to be started. Specifically, the experimental air pressure is not less than 20Kpa of the minimum air pressure in the vacuum measurement box; Step 4: Set the test temperature and preheat the device: set the heat source temperature T1 and start the heating heat source, the thermocouple I measures the temperature of the distilled water in the hot water tank in real time, and the computer controls the heating heat source to heat the distilled water in the hot water tank to the test temperature T1, and then starts the preheating process of the device. The computer controls the circulation pump II to be started, and the hot water enters the inner spiral heat exchanger in the vacuum measurement box through the hot end pipeline and returns to the cold water tank through the cold end pipeline. In this process, the test device is fully preheated until the heat flow measured by the heat flow meter I and the heat flow meter II remains relatively consistent, that is, the preheating of the device is completed.Specifically, the test temperature T1 is greater than the phase change temperature T0 of the phase change material, and the values indicated by the heat flow meters I and II are within 1% of each other; step 5: start the heat storage performance test: the computer controls the steering engine to rotate to release the L-shaped slider, and the driving spring provides an elastic force to slide the L-shaped slider and the to-be-tested container along the guide optical axis until the to-be-tested container is matched with the inner spiral heat exchanger, and is adsorbed by the magnet I and the magnet II, so that the relative position of the to-be-tested container and the inner spiral heat exchanger is fixed; the computer controls the circulating pump II 11 to be turned on, and the distilled water at the temperature T1 enters the inner spiral heat exchanger to fully exchange heat with the to-be-tested phase change material, the thermocouple II measures the temperature of the to-be-tested phase change material in real time, and the heat flow meters I and II measure the heat flow at the water outlet and the water inlet of the vacuum measurement tank in real time; the above data are collected by the data acquisition instrument in real time and transmitted to the computer; when the heat flow at the water outlet and the water inlet of the measurement tank remains relatively consistent, the test process is ended, and the computer analyzes and calculates the heat flow and the temperature of the phase change material collected by the data acquisition instrument, so that the heat storage performance parameters of the tested phase change material are obtained. Specifically, the values indicated by the heat flow meters I and II are within 1% of each other; step 6: restore the initial state: the computer controls the circulating pump II, the vacuum pump and the heating source to be turned off, the circulating pump I is turned on, the distilled water in the cold water tank is pumped back into the hot water tank, the test personnel pull up the pressure relief button to achieve pressure relief in the vacuum measurement tank, then the test personnel open the top cover to take out the to-be-tested container, and clean the phase change material in the to-be-tested container, so that the device returns to the initial state; step 7: read the test data: the test personnel can obtain the heat storage performance parameters of the phase change material by reading the test data recorded on the computer and the specific parameters obtained by analysis.

[0020] In summary, due to the adoption of the above technical solutions, the phase change material heat storage performance testing device has the following advantages and beneficial effects:

[0021] 1. The device has a simple structure, and the cost is nearly 5 times lower than that of the existing similar testing equipment, so that the testing cost is low, and the further development of the phase change heat storage technology is facilitated.

[0022] 2. The L-shaped slider and the to-be-tested container are fixed or moved relative to each other through the cooperation of the groove I of the L-shaped slider and the elastic buckle I of the to-be-tested container, so that the test personnel can take out or put the to-be-tested container into the vacuum measurement tank, quickly replace and clean the phase change material in the to-be-tested container, and improve the test efficiency.

[0023] 3. The locking bolt and the locking pad are threadedly connected to press the top cover and the O-shaped sealing ring on the upper end surface of the vacuum measurement tank, so that the end surface is sealed, the air outside is prevented from entering the vacuum measurement tank, the vacuum pump and the exhaust pipeline are arranged to pump out the air in the vacuum measurement tank, the vacuum environment in the tank is maintained, the heat exchange between the air and the phase change material and the influence of the external environment temperature are avoided, and the accuracy of the test result is ensured.

[0024] The testing method of the phase change material heat storage performance testing device has the following advantages and beneficial effects:

[0025] 1. The method for setting the experimental gas pressure and preheating the testing device reduces heat exchange between the phase change material to be tested and the outside world, thereby ensuring the accuracy of the test data.

[0026] 2. The phase change material heat storage performance parameters are calculated by analyzing the data of the phase change material heat storage (the difference between the water inlet and outlet heat flow) and the phase change material temperature changing with time collected by the data acquisition instrument through the computer, and the test is highly targeted.

[0027] 3. The present application mainly carries out related tests based on computer control, and completes the phase change material heat storage performance test through 7 steps, which is simple in operation process and convenient for repeated and large-scale tests. DETAILED DESCRIPTION

[0028] Figure 1 It is a structural schematic view of the phase change material heat storage performance testing device.

[0029] Figure 2 It is a structural top view of the phase change material heat storage performance testing device.

[0030] Figure 3 It is a schematic view of the internal structure of the vacuum measuring box of the phase change material heat storage performance testing device.

[0031] Figure 4 It is a partial enlarged view A of the vacuum measuring box of the phase change material heat storage performance testing device.

[0032] Figure 5 It is a schematic view of the bottom structure of the vacuum measuring box of the phase change material heat storage performance testing device.

[0033] Figure 6 It is a partial enlarged view B of the vacuum measuring box of the phase change material heat storage performance testing device.

[0034] Figure 7 It is a schematic view of the cooperation between the L-shaped sliding block and the inner spiral heat exchanger of the phase change material heat storage performance testing device.

[0035] Figure 8 It is a schematic view of the container structure of the phase change material heat storage performance testing device.

[0036] Figure 9 It is a schematic view of the cooperation between the L-shaped sliding block and the linear bearing of the phase change material heat storage performance testing device.

[0037] Figure 10 It is a hollow spiral pipe schematic diagram of the internal spiral heat exchanger of the phase change material heat storage performance testing device.

[0038] Figure 11 It is a testing method flow schematic diagram of the phase change material heat storage performance testing device.

[0039] In the figure: 1-vacuum measurement box, 2-heat flow meter I, 3-data acquisition instrument, 4-cold end pipeline, 5-cold water tank, 6-hot water tank, 7-circulation pipeline, 8-circulation pump I, 9-bottom plate, 10-hot end pipeline, 11-circulation pump II, 12-heat flow meter II, 13-pressure relief button, 14-lever support, 15-top cover lever, 16-vacuum pump, 17-exhaust pipeline, 18-O-shaped sealing ring, 19-locking pad, 20-top cover, 21-locking bolt, 22-heating heat source, 23-thermocouple I, 24-driving spring, 25-releaser, 26-rudder, 27-L-shaped sliding block, 28-magnet I, 29-container to be measured, 30-internal spiral heat exchanger, 31-magnet II, 32-guiding optical axis, 33-heat exchange base, 34-flange seat, 35-groove I, 36-elastic buckle I, 37-groove II, 38-elastic buckle II, 39-dovetail rail, 40-thermocouple II, 41-dovetail groove, 42-linear bearing, 43-computer. DETAILED DESCRIPTION

[0040] The application will be further described below in conjunction with the embodiments, but the embodiments of the application are not limited thereto.

[0041] To make the objectives, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application. Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application.

[0042] In the description of the application, it should be understood that the orientation or positional relationship indicated by terms such as indicates the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "arranging", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated, and the specific means is not limited to various conventional mechanical connection modes such as screwing, interference fit, riveting, threaded connection and the like. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "upper end", "upper" and "upper surface" of the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "upper end", "lower" and "lower surface" of the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] Embodiment 1:

[0046] As shown in Figures 1-3 A phase change material heat storage performance testing device, the device has simple structure, convenient and fast operation, accurate testing and low cost, realizes efficient testing of phase change materials, thereby obtaining phase change material heat storage performance parameters, and provides support for further development of phase change heat storage technology, comprising a vacuum measurement box 1, a hot water tank 6 and a cold water tank 5, the water outlet of the vacuum measurement box 1 is connected with the cold water tank 5 through a cold end pipeline 4, a heat flow meter I 2 is arranged between the water outlet of the vacuum measurement box 1 and the cold water tank 5, the water inlet of the vacuum measurement box 1 is connected with the hot water tank 6 through a hot end pipeline 10, a heat flow meter II 12 and a circulating pump II 11 are arranged between the water inlet of the vacuum measurement box 1 and the hot water tank 6, a heating heat source 22 and a thermocouple I 23 are installed in the hot water tank 6, the other end of the hot water tank 6 is connected with the other end of the cold water tank 5 through a circulating pipeline 7 and a circulating pump I 8, the other end of the vacuum measurement box 1 is connected with a vacuum pump 16 through an exhaust pipeline 17, a lever support 14 is fixed on the upper end of the vacuum measurement box 1, a top cover 20 lever 15 is hinged with the lever support 14, the top cover 20 is hinged with the top cover 20 lever 15, a locking bolt 21 is movably matched in the through hole at the front end of the top cover 20 lever 15, a locking pad 19 is fixed on the upper end of the vacuum measurement box 1, a pressure relief button 13 is installed in the through hole on the upper end of the vacuum measurement box 1, and an O-shaped sealing ring 18 is embedded in the annular groove on the upper end of the vacuum measurement box 1.

[0047] It also includes the container 29 to be measured, L-shaped slider 27, guide light axis 32 and inner spiral heat exchanger 30, the container 29 to be measured is matched on the L-shaped slider 27, the L-shaped slider 27 is movably matched on the guide light axis 32 through the linear bearing 42, the magnet I 28 is installed below the L-shaped slider 27, the two ends of the guide light axis 32 are fixed on the inner wall of the vacuum measuring box 1 through the flange seat 34, the inner spiral heat exchanger 30 is fixed above the heat exchange base 33, the magnet II 31 is installed below the inner spiral heat exchanger 30, the water inlet of the inner spiral heat exchanger 30 is connected with the water inlet of the vacuum measuring box 1, the water outlet of the inner spiral heat exchanger 30 is connected with the water outlet of the vacuum measuring box 1, and the heat exchange base 33 is fixed on the guide light axis 32.

[0048] It also includes the rudder 26, the releaser 25, the driving spring 24, the rudder 26 is fixed on the releaser 25, the releaser 25 is fixed on the inner wall of the vacuum measuring box 1, and the driving spring 24 is matched with the guide light axis 32.

[0049] It also includes the data acquisition instrument 3, the data acquisition instrument 3 is connected with the thermocouple II 40, the thermocouple I 23, the rudder 26, the heat flow meter I 2 and the heat flow meter II 12 through wires, the thermocouple II 40 is installed at the bottom in the container 29 to be measured, and the data acquisition instrument 3 is connected with the computer 43 through wires.

[0050] It also includes the bottom plate 9, the vacuum measuring box 1, the hot water tank 6, the cold water tank 5, the data acquisition instrument 3, the circulating pump I 8, the circulating pump II 11 and the vacuum pump 16 are fixed on the bottom plate 9.

[0051] Embodiment 2:

[0052] This embodiment is further optimized on the basis of the above-mentioned embodiment, and the same as the foregoing technical solutions will not be repeated here, such as Figures 1-2 As shown in the figure, further, in order to better realize the heat storage performance testing device of the phase change material, the following setting structure is adopted: the top cover 20 and the O-shaped sealing ring 18 above the vacuum measuring box 1 are pressed tightly to realize end face sealing and avoid external air entering the vacuum measuring box 1 by threadedly matching the locking bolt 21 with the locking pad 19. At the same time, the air in the vacuum measuring box 1 is extracted to maintain the internal vacuum environment, avoid air heat exchange with the phase change material and external environment temperature influence, and ensure the accuracy of the phase change material heat storage performance test by setting the vacuum pump 16 and the exhaust pipe 17.

[0053] Embodiment 3:

[0054] The embodiment is further optimized on the basis of the above embodiment, and the same parts as the foregoing technical solutions will not be described here. Figures 3-4 As shown in the figure, further, in order to better realize the phase change material heat storage performance testing device, the following setting structure is particularly adopted: the L-shaped slider 27 is provided with a groove I 35 above, the to-be-tested container 29 is provided with an elastic buckle I 136, the elastic buckle I 136 cooperates with the groove I 35, realizes the fixing of the relative position of the to-be-tested container 29 and the L-shaped slider 27, the elastic buckle I 136 and the groove I 35 are disengaged, realizes the movement of the relative position of the to-be-tested container 29 and the L-shaped slider 27, and the to-be-tested container 29 is convenient for the tester to take out / put into the vacuum measuring box 1, quickly replace and clean the phase change material in the to-be-tested container 29, and improve the testing efficiency.

[0055] Embodiment 4:

[0056] The embodiment is further optimized on the basis of the above embodiment, and the same parts as the foregoing technical solutions will not be described here. Figures 5-7 As shown in the figure, further, in order to better realize the phase change material heat storage performance testing device, the following setting structure is particularly adopted: the L-shaped slider 27 is provided with a groove I 35 above, the to-be-tested container 29 is provided with an elastic buckle I 136, the elastic buckle I 136 cooperates with the groove I 35, realizes the fixing of the relative position of the to-be-tested container 29 and the L-shaped slider 27, the elastic buckle I 136 and the groove I 35 are disengaged, realizes the movement of the relative position of the to-be-tested container 29 and the L-shaped slider 27, and the to-be-tested container 29 is convenient for the tester to take out / put into the vacuum measuring box 1, quickly replace and clean the phase change material in the to-be-tested container 29, and improve the testing efficiency.

[0057] Embodiment 5:

[0058] The embodiment is further optimized on the basis of the above embodiment, and the same parts as the foregoing technical solutions will not be described here. Figures 8-9 As shown in the figure, further, in order to better realize the phase change material heat storage performance testing device, the following setting structure is particularly adopted: the L-shaped slider 27 is provided with a groove I 35 above, the to-be-tested container 29 is provided with an elastic buckle I 136, the elastic buckle I 136 cooperates with the groove I 35, realizes the fixing of the relative position of the to-be-tested container 29 and the L-shaped slider 27, the elastic buckle I 136 and the groove I 35 are disengaged, realizes the movement of the relative position of the to-be-tested container 29 and the L-shaped slider 27, and the to-be-tested container 29 is convenient for the tester to take out / put into the vacuum measuring box 1, quickly replace and clean the phase change material in the to-be-tested container 29, and improve the testing efficiency.

[0059] Embodiment 6:

[0060] The embodiment is further optimized on the basis of the above embodiment, and the same parts as the foregoing technical solutions will not be described here. Figure 10As shown, further, to better achieve the heat storage performance testing device of the present application, the following arrangement structure is particularly adopted: the hollow pipeline is arranged in a spiral manner inside the wall surface of the inner spiral heat exchanger 30, which facilitates sufficient heat exchange between the heat exchange liquid in the inner spiral heat exchanger 30 and the phase change material in the to-be-tested container 29 in actual testing, thereby ensuring the accuracy of the phase change material heat storage performance testing.

[0061] Embodiment 7:

[0062] In view of the technical problems mentioned in the background art, the present application provides a testing method of a phase change material heat storage performance testing device, which can be applied to the device as in Embodiment 1, and the testing method comprises the following steps: Figures 1-3 As shown, the data acquisition instrument 3 can be used to collect the heat flow and the temperature change data of the phase change material over time at the water inlet and outlet in real time when the phase change material undergoes phase change, and the computer 43 can be used to analyze the relevant data collected by the data acquisition instrument 3 to calculate the phase change material heat storage performance parameters, and the specific execution process needs to be further understood with reference to the testing method flowchart as shown in Figure 11 As shown, the testing method comprises the following steps: Figure 11

[0063] Step 1: Prepare the to-be-tested sample: take out the to-be-tested container 29 from the vacuum measuring box 1, and place the to-be-tested phase change material with a known mass in the to-be-tested container 29.

[0064] Specifically, the to-be-tested phase change material is a solid-solid phase change material or a solid-liquid phase change material, and the mass of the to-be-tested phase change material is not greater than the rated test mass 800g of the device.

[0065] Step 2: Initialize the testing device: inject a certain amount of distilled water into the hot water tank 6; cooperate the to-be-tested container 29 with the L-shaped slider 27 of the vacuum measuring box 1 through the dovetail groove 41, and cooperate the to-be-tested container 29 with the recess I 35 through the elastic buckle I 36 to fix the to-be-tested container 29 on the L-shaped slider 27; cooperate the L-shaped slider 27 with the release 25 through the elastic buckle II 38 and the recess II 37 to make the driving spring 24 in a compressed energy storage state; and cooperate the locking bolt 21 with the locking pad 19 through the thread and tighten to press the top cover 20 and the O-shaped sealing ring 18 on the upper end surface of the vacuum measuring box 1, thereby realizing the sealing of the vacuum measuring box 1.

[0066] Specifically, the amount of distilled water injected is not less than 10L of the rated capacity of the hot water tank 6 and not greater than 15L of the maximum capacity of the hot water tank 6, and the distilled water can be replaced with a heat exchange medium with a higher boiling point in a timely manner according to the phase change temperature of the to-be-tested phase change material.

[0067] ​Step 3: Set the experimental air pressure: Set the experimental air pressure, the computer 43 controls to open the vacuum pump 16, the air in the vacuum measurement box 1 is extracted by the vacuum pump 16 through the exhaust pipe 17, when the internal air pressure is reduced to the experimental air pressure, the computer 43 controls to stop the vacuum pump 16 from working; when the internal air pressure is greater than the experimental air pressure, the computer 43 controls to start the vacuum pump 16.

[0068] Specifically, the experimental air pressure is not less than the minimum air pressure 20Kpa in the vacuum measurement box 1.

[0069] Step 4: Set the test temperature and preheat the device: Set the heat source temperature T1 and start the heating heat source 22, the thermocouple I 23 measures the temperature of the distilled water in the hot water tank 6 in real time, and the computer 43 controls the heating heat source 22 to heat the distilled water in the hot water tank 6 to the test temperature T1, and then starts the preheating device process, the computer 43 controls to start the circulating pump II 11, and the hot water enters the inner spiral heat exchanger 30 in the vacuum measurement box 1 through the hot end pipe 10 and returns to the cold water tank 5 through the cold end pipe 4, in this process, the test device is fully preheated, and the heat flow meter I 2 and the heat flow meter II 12 keep relatively consistent, that is, the preheating of the device is completed.

[0070] Specifically, the test temperature T1 is greater than the phase change temperature T0 of the phase change material, and the relative consistency means that the values shown by the heat flow meter I 2 and the heat flow meter II 12 differ by 1% or less.

[0071] Step 5: Start the heat storage performance test: The computer 43 controls the steering engine 26 to rotate to release the L-shaped sliding block 27, the driving spring 24 provides elastic force to drive the L-shaped sliding block 27 and the to-be-tested container 29 to slide along the guide optical axis 32 until the to-be-tested container 29 is matched with the inner spiral heat exchanger 30 as a whole, and is adsorbed by the magnet I 28 and the magnet II 31, so that the relative position of the to-be-tested container 29 and the inner spiral heat exchanger 30 is fixed; the computer 43 controls to start the circulating pump II 11, and the distilled water with a temperature of T1 enters the inner spiral heat exchanger 30 and fully exchanges heat with the to-be-tested phase change material, the thermocouple II 40 measures the temperature of the to-be-tested phase change material in real time, and the heat flow meter I 2 and the heat flow meter II 12 measure the heat flow at the water outlet and the water inlet of the vacuum measurement box 1 in real time. The above data is collected by the data acquisition instrument 3 in real time and transmitted to the computer 43, when the heat flow at the water outlet and the water inlet of the vacuum measurement box 1 keeps relatively consistent, the test process is completed, and the computer 43 analyzes and calculates the heat flow and the temperature of the phase change material collected by the data acquisition instrument 3, that is, the heat storage performance parameters of the tested phase change material are obtained.

[0072] Specifically, the relative consistency means that the values shown by the heat flow meter I 2 and the heat flow meter II 12 differ by 1% or less.

[0073] Step 6: restore the initial state: the computer 43 controls to close the circulating pump II 11, vacuum pump 16 and heating source 22, open circulating pump I 8, the distilled water in the cold water tank 5 is pumped back to the hot water tank 6, the test personnel lift the pressure relief button 13, realize the pressure relief in the vacuum measuring tank 1, then open the top cover 20 to take out the container 29 to be tested, and clean the phase change material in it, realize the whole device to restore the initial state.

[0074] Step 7: read the test data: the test personnel can obtain the heat storage performance parameters of the phase change material through the test data recorded on the computer 43 and the specific parameters obtained by analysis.

[0075] Through the method provided by the application, the heat storage capacity of the phase change material (the difference between the water inlet and outlet heat flow) and the data of the phase change material temperature changing with time can be accurately tested, and the phase change latent heat, heat storage density and thermal conductivity of the phase change material can be calculated. The method is simple in operation, clear in test principle and accurate in test data, can intuitively reflect the heat storage performance of the phase change material through the test, and is suitable for application and promotion in actual production.

[0076] The above is only the preferred embodiment of the application, and does not limit the application in any form. Any simple modification and equivalent change made according to the technical essence of the application to the above embodiment are within the protection scope of the application.

Claims

1. A phase change material heat storage performance testing device, characterized by: The invention comprises a vacuum measuring box (1), a hot water tank (6) and a cold water tank (5), wherein the water outlet of the vacuum measuring box (1) is connected to the cold water tank (5) through a cold end pipe (4), a heat flow meter I (2) is provided between the water outlet of the vacuum measuring box (1) and the cold water tank (5), the water inlet of the vacuum measuring box (1) is connected to the hot water tank (6) through a hot end pipe (10), a heat flow meter II (12) and a circulation pump II (11) are provided between the water inlet of the vacuum measuring box (1) and the hot water tank (6), a heating heat source (22) and a thermocouple I (23) are installed inside the hot water tank (6), and the other end of the hot water tank (6) is connected to the cold water tank (5) through a circulation pipe (7) and a circulation pump I (8). ), the other end of the vacuum measuring box (1) is connected to the vacuum pump (16) through the exhaust pipe (17), the lever support (14) is fixed to the upper end of the vacuum measuring box (1), the top cover lever (15) is hinged to the lever support (14), the top cover (20) is hinged to the top cover lever (15), the locking bolt (21) is movably fitted in the through hole at the front end of the top cover lever (15), the locking pad (19) is fixed to the upper end of the vacuum measuring box (1), the locking bolt (21) and the locking pad (19) are threadedly fitted, the pressure relief button (13) is installed in the through hole at the upper end of the vacuum measuring box (1), and the O-ring (18) is embedded in the annular groove at the upper end of the vacuum measuring box (1); The device further comprises a container to be measured (29), an L-shaped slider (27), a guide light shaft (32) and an inner spiral heat exchanger (30), wherein the container to be measured (29) is fitted on the L-shaped slider (27), the L-shaped slider (27) is movably fitted on the guide light shaft (32) via a linear bearing (42), a magnet I (28) is installed below the L-shaped slider (27), both ends of the guide light shaft (32) are fixed to the inner wall of the vacuum measuring box (1) via a flange seat (34), and the inner spiral heat exchanger (30) is provided on the inner spiral heat exchanger (30). A hollow pipe is arranged in a spiral shape inside the wall of the spiral heat exchanger (30), the inner spiral heat exchanger (30) is fixed above the heat exchange base (33), a magnet II (31) is installed below the inner spiral heat exchanger (30), the water inlet of the inner spiral heat exchanger (30) is connected to the water inlet of the vacuum measuring box (1), the water outlet of the inner spiral heat exchanger (30) is connected to the water outlet of the vacuum measuring box (1), and the heat exchange base (33) is fixed on the guide optical axis (32); It also includes a steering gear (26), a releaser (25), and a driving spring (24), wherein the steering gear (26) is fixed on the releaser (25), the releaser (25) is fixed on the inner wall of the vacuum measuring box (1), and the driving spring (24) cooperates with the guide light axis (32); The device further comprises a data acquisition instrument (3), wherein the data acquisition instrument (3) is connected to the thermocouple II (40), the thermocouple I (23), the steering gear (26), the heat flow meter I (2) and the heat flow meter II (12) via wires, the thermocouple II (40) is installed at the bottom of the container to be tested (29), and the data acquisition instrument (3) is connected to the computer (43) via wires; It also includes a base plate (9), on which the vacuum measuring box (1), the hot water tank (6), the cold water tank (5), the data acquisition instrument (3), the circulating pump I (8), the circulating pump II (11) and the vacuum pump (16) are fixed.

2. A phase change material heat storage performance testing device according to claim 1, characterized in that: A groove I (35) is provided above the L-shaped slider (27), and an elastic buckle I (36) is provided on the container to be tested (29), and the elastic buckle I (36) is matched with the groove I (35).

3. The phase change material heat storage performance testing device according to claim 1, characterized in that: The L-shaped slider (27) is provided with two dovetail grooves (41), and the container to be tested (29) is provided with a dovetail track (39), and the dovetail grooves (41) are matched with the dovetail track (39).

4. The phase change material heat storage performance testing device according to claim 1, characterized in that: The bottom of the L-shaped slider (27) is provided with a groove II (37), and the releaser (25) is provided with an elastic buckle II (38). The elastic buckle II (38) cooperates with the groove II (37) to compress the drive spring (24) to store energy, forming a test state; the steering gear (26) rotates to press down the elastic buckle II (38) on the releaser (25), and the drive spring (24) provides elastic force to make the L-shaped slider (27) slide along the guide light axis (32) and be adsorbed by the magnet I and the magnet II (31), so that the L-shaped slider (27) and the inner spiral heat exchanger (30) cooperate to form a release state.

5. The phase change material heat storage performance testing device according to claim 1, characterized in that: The two guide light shafts (32) are mounted on the inner wall of the vacuum measuring box (1) in a mirror-symmetrical manner through the flange seat (34); the two linear bearings (42) that are movably engaged with the guide light shafts (32) are fixed on the bottom of the L-shaped slider (27) in a mirror-symmetrical manner; and the two driving springs (24) are coaxially movably engaged with the two guide light shafts (32), respectively.

6. The testing method of the testing device according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: Prepare the sample to be tested: take out the container to be tested (29) from the vacuum measuring box (1), and place the phase change material to be tested of known mass into the container to be tested (29); Step 2: Initialize the test device: inject a certain amount of distilled water into the hot water tank (6); fit the container to be tested (29) on the L-shaped slider (27) of the vacuum measuring box (1) through the dovetail groove (41), and fit the elastic snap Ⅰ (36) with the groove Ⅰ (35) to fix the container to be tested (29) on the L-shaped slider (27); fit the L-shaped slider (27) and the releaser (25) through the elastic snap Ⅱ (38) and the groove Ⅱ (37) to put the driving spring (24) in a compressed energy storage state; fit the locking bolt (21) and the locking pad (19) through the thread and tighten them to press the top cover (20) and the O-shaped sealing ring (18) on the upper end surface of the vacuum measuring box (1) to achieve the sealing of the vacuum measuring box (1); Step 3: Setting the experimental air pressure: Setting the experimental air pressure, the computer (43) controls the start of the vacuum pump (16), and the air in the vacuum measuring box (1) is extracted by the vacuum pump (16) through the exhaust pipe (17). When the internal air pressure is reduced to the experimental air pressure, the computer (43) controls the stop of the vacuum pump (16); when the internal air pressure is greater than the experimental air pressure, the computer (43) controls the start of the vacuum pump (16); Step 4: Set the test temperature and preheat the device: Set the heat source temperature T1 and turn on the heating source (22). The thermocouple I (23) measures the temperature of the distilled water in the hot water tank (6) in real time. The computer (43) controls the heating source (22) to heat the distilled water in the hot water tank (6) to the test temperature T1, and then starts the preheating process. The computer (43) controls the opening of the circulation pump II (11). The hot water enters the inner spiral heat exchanger (30) in the vacuum measuring box (1) through the hot end pipe (10) and returns to the cold water tank (5) through the cold end pipe (4). During this process, the test device is fully preheated until the heat flow measured by the heat flow meter I (2) and the heat flow meter II (12) remain relatively consistent, that is, the device preheating is completed; Step 5: Start the heat storage performance test: the computer (43) controls the steering gear (26) to rotate and release the L-shaped slider (27), and the driving spring (24) provides elastic force to slide the L-shaped slider (27) and the container to be tested (29) along the guide optical axis (32) until the container to be tested (29) is matched with the inner spiral heat exchanger (30) as a whole, and the relative position of the container to be tested (29) and the inner spiral heat exchanger (30) is fixed by adsorption of magnet I (28) and magnet II (31); the computer (43) controls the opening of the circulation pump II (11), and the distilled water with a temperature of T1 enters the inner spiral heat exchanger (30) and is mixed with the container to be tested (29). The phase change material is measured to conduct sufficient heat exchange, the thermocouple II (40) measures the temperature of the phase change material to be measured in real time, the heat flow meter I (2) and the heat flow meter II (12) measure the heat flow of the water outlet and the water inlet of the vacuum measuring box (1) in real time, the above data are collected in real time by the data acquisition instrument (3) and transmitted to the computer (43), when the heat flow of the water outlet and the water inlet of the vacuum measuring box (1) remains relatively consistent, the test process ends, the computer (43) analyzes and calculates the data of the heat flow and the phase change material temperature change over time collected by the data acquisition instrument (3), that is, the heat storage performance parameters of the tested phase change material are obtained; Step 6: Restoring the initial state: The computer (43) controls the closing of the circulation pump II (11), the vacuum pump (16) and the heating source (22), and the opening of the circulation pump I (8), and the distilled water in the cold water tank (5) is pumped back into the hot water tank (6). The tester lifts the pressure relief button (13) to relieve the pressure inside the vacuum measuring box (1). The tester then opens the top cover (20), takes out the container to be tested (29), and cleans the phase change material therein, so that the entire device is restored to its initial state. Step 7: Reading test data: The tester can obtain the heat storage performance parameters of the phase change material through the test data recorded on the computer (43) and the specific parameters obtained by analysis.

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