Teaching experiment device for measuring specific heat and latent heat of phase change material

Abstract

The utility model relates to the field of teaching experiments related to thermal properties of phase-change materials, and particularly discloses a teaching experiment device for measuring specific heat and latent heat of a phase-change material, which mainly comprises a shell, a top cover, a temperature sensor, the phase-change material and a metal framework with a through hole structure. The metal framework is arranged in an inner cavity formed by the shell and the top cover, and the phase change material is arranged in the metal framework; a through hole is further formed in the top cover, so that a temperature sensing probe of the temperature sensor can extend into the through hole of the metal framework of the inner cavity of the shell through the through hole, and the temperature in the device is measured. In the using process of the device, a heat flow channel can be constructed through the through hole structure of the metal framework, and meanwhile, heat conduction in the device is accelerated by combining the high heat conductivity of the metal framework, so that the temperature of the phase change material in the device can be rapidly increased, and the phase change process is completed within a short time; the problems of low heat conduction efficiency and long teaching time in an existing teaching experiment are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of teaching experiments related to the thermal performance of phase change materials, and in particular to a teaching experiment device for measuring the specific heat and latent heat of phase change materials. BACKGROUND

[0002] In the current conventional teaching experiment for measuring the latent heat and specific heat of phase change materials, the commonly used method is to place the phase change material in a vacuum cup containing hot water. In this process, the energy of the hot water is transferred from the outside to the inside through the light metal shell, thereby driving the phase change material to absorb heat and trigger phase change.

[0003] However, this process of measuring the latent heat and specific heat of phase change materials in teaching has significant defects. On the one hand, the heating, cooling and phase change process of the phase change material takes a very long time, and with the time arrangement of conventional experimental teaching, it is impossible to complete this series of processes in a short time. On the other hand, the heat transfer efficiency from the outside to the inside of the phase change material is low. This low-efficiency heat transfer method will cause a significant temperature difference between the outer wall or the water temperature and the center of the sample, further hindering the accurate quantitative measurement of the specific heat and latent heat of the phase change material. The specific heat and latent heat are key parameters for characterizing the performance of phase change materials, and accurate measurement of them is of great significance for studying the energy storage and conversion mechanism of phase change materials and evaluating their potential in practical applications. Therefore, due to the interference of temperature difference, the experimental data may deviate greatly, which cannot truly reflect the inherent properties of the phase change material.

[0004] The existing measurement method seriously affects the quality and effect of experimental teaching. The long experimental period makes it difficult to implement the teaching plan smoothly, and students cannot fully master the experimental content in a limited time; in addition, inaccurate measurement results cause students to have a biased understanding of phase change materials, which cannot lay a solid foundation for subsequent learning and research. Therefore, there is an urgent need for a new method or device that can quickly and accurately measure the specific heat and latent heat of phase change materials to meet the needs of reasonable time arrangement and content-rich experimental teaching. CONTENT OF THE INVENTION

[0005] Therefore, the purpose of the present application is to provide a teaching experiment device for measuring the specific heat and latent heat of phase change materials, which solves the problem of low heat conduction efficiency and long teaching time in measuring the specific heat and latent heat.

[0006] To achieve the above technical purpose, the present application provides a teaching experiment device for measuring the specific heat and latent heat of phase change materials, comprising a shell 1, a top cover 2, a temperature sensor 3, a metal framework 4 and a phase change material 7.

[0007] The top end of the shell 1 is provided with a top cover 2 for sealing the shell 1.

[0008] The metal skeleton 4 is arranged in the inner cavity of the shell 1, and the metal skeleton 4 is provided with through holes, and the phase change material 7 is filled in the through holes of the metal skeleton;

[0009] The top cover 2 is provided with a through hole 6, and the temperature sensing probe of the temperature sensor 3 is arranged in the through hole of the metal skeleton 4 along the through hole 6 to measure the temperature in the inner cavity of the shell 1.

[0010] Further, the metal skeleton 4 includes a plurality of through holes arranged in an array to form a matrix type metal skeleton 4 for constructing a uniform heat flow channel to accelerate heat conduction.

[0011] Further, the lateral spacing of adjacent through holes is 1.2-2.5 mm, the longitudinal spacing is 1.2-2.5 mm, and the diameter of the through hole is 0.8-2.0 mm.

[0012] Further, the outer edge of the metal skeleton 4 is matched with the inner cavity of the shell 1, so that the metal skeleton 4 is stably arranged in the inner cavity of the shell 1.

[0013] Further, the material of the metal skeleton 4 is one of copper, aluminum and silver; the material of the shell 1 is one of nano ceramic aluminum alloy and titanium alloy; and the material of the top cover 2 is one of nano ceramic aluminum alloy and titanium alloy.

[0014] Further, the elastic sealing medium 5 is further included for sealing the open heat conduction part of the device.

[0015] Further, the open heat conduction part includes the joint of the shell 1 and the top cover 2, and the through hole 6.

[0016] Further, the elastic sealing medium 5 is epoxy resin.

[0017] Further, the phase change material 7 is paraffin.

[0018] Further, the shell 1 is one of a cylindrical shape and a square shape.

[0019] In summary, the application provides a teaching experiment device specially applied to a teaching scene, aiming to accurately measure the specific heat and latent heat of phase change materials. The device is mainly composed of a shell 1, a top cover 2, a temperature sensor 3, and a metal framework 4 with a through hole, and other key components. Among them, the metal framework 4 is installed in the inner cavity of the shell 1, and the phase change material 7 is filled in the through hole of the metal framework; the top cover 2 is located at the top end of the shell 1, and plays an important role in sealing the shell 1. A through hole 6 is also provided on the top cover 2, so that the temperature sensing probe of the temperature sensor 3 can smoothly extend into the through hole of the metal framework 4 in the inner cavity of the shell 1, and then accurately measure the temperature in the inner cavity of the device. During use, the through hole structure of the metal framework can be used to construct a heat flow channel, and the high thermal conductivity of the metal framework itself can be used to accelerate the heat conduction process in the device, so as to quickly heat the phase change material in the device and complete the phase change in a short time. Compared with the prior art, the device can effectively shorten the teaching time and provide great convenience for experimental teaching. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 A schematic diagram of a teaching experiment device for measuring the specific heat and latent heat of phase change materials provided by the embodiments of the present application;

[0022] Reference signs: 1, shell; 2, top cover; 3, temperature sensor; 4, metal framework; 5, elastic sealing medium; 6, through hole; 7, phase change material. DETAILED DESCRIPTION

[0023] The technical solutions of the embodiments of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0024] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] Unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. 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.

[0026] The embodiment of the present application provides a kind of teaching experiment device for measuring specific heat and latent heat of phase change material, including, including shell 1, top cover 2, temperature sensor 3, metal framework 4:

[0027] The top end of shell 1 is provided with top cover 2, for sealing the shell 1;

[0028] Metal framework 4 is arranged in the inner cavity of shell 1;And through hole is opened in metal framework 4, and phase change material 7 is filled in the through hole inside metal framework;

[0029] Through hole 6 is opened in top cover 2, and temperature sensor 3 is placed in the through hole inside metal framework 4 along through hole 6, to measure the temperature in the inner cavity of shell 1.

[0030] It should be noted that in actual measurement operation process, solid phase change material is placed into the through hole of metal framework, and then hot water with known temperature and mass is injected into the vacuum cup. At this time, the solid phase change material will rapidly exchange heat with hot water under the heat conduction of metal framework and its own contact with hot water, continuously absorb heat, so that its temperature steadily rises, until the phase change temperature point is reached, and then the phase change phenomenon is triggered. In this process, the temperature sensor needs to monitor the dynamic change of the temperature inside the device. Then according to the law of conservation of energy, the specific heat and latent heat of phase change material and other key thermophysical parameters are derived.

[0031] In some embodiments, metal framework 4 includes a plurality of through holes, which are arranged in an array to form a matrix metal framework 4 for constructing a uniform heat flow channel to accelerate heat conduction.

[0032] In some embodiments, the lateral spacing between adjacent through holes is 1.2-2.5 mm, and the longitudinal spacing is 1.2-2.5 mm; the diameter of the through holes is 0.8-2.0 mm.

[0033] It should be noted that the arrayed through holes on the metal skeleton 4 can uniformly distribute the phase change material inside the device, increase the contact area between the phase change material and the metal skeleton, make the heat conduct more quickly and uniformly in the device, speed up the heating speed of the phase change material, reduce the waiting time of the experiment, make the entire phase change process be completed within a limited teaching time, and make the temperature change in the experiment more rapid and obvious, facilitating the observation and data recording of students.

[0034] In some embodiments, the outer edge of the metal skeleton 4 is adapted to the inner cavity of the shell 1, so that the metal skeleton 4 is stably arranged in the inner cavity of the shell 1.

[0035] In some embodiments, the material of the metal skeleton 4 is one of copper, aluminum, and silver; the material of the shell 1 is one of nano-ceramic aluminum alloy and titanium alloy; and the material of the top cover 2 is one of nano-ceramic aluminum alloy and titanium alloy.

[0036] It should be noted that the nano-ceramic aluminum alloy and titanium alloy have the characteristics of high strength, light weight, and good heat insulation, which can ensure that the shell of the device is firm and durable, and at the same time, reduce the overall weight, facilitating the movement and operation in the teaching scene; the good heat insulation can also effectively reduce the heat dissipation inside the device, improving the accuracy of the detection result. In addition, their good corrosion resistance can prevent the shell from being corroded and damaged in the experimental environment, prolonging the service life of the device. Copper, aluminum, and silver are all metals with excellent heat conduction performance, and using them as the material of the metal skeleton can efficiently transfer heat to the phase change material, improving the heat conduction efficiency. At the same time, the stability of these metals also helps to ensure the stability of the heat conduction performance during the experiment, ensuring the reliability of the experimental results.

[0037] In some embodiments, an elastic sealing medium 5 is further included for sealing the open heat conduction part of the device.

[0038] It should be noted that sealing the open heat conduction part can prevent the exchange of gas and heat inside and outside the device, ensuring that a relatively independent and stable thermal environment is formed inside the device. Avoiding heat loss can reduce experimental errors and ensure the accuracy of experimental measurements.

[0039] Preferably, the open heat conduction part includes the joint of the shell 1 and the top cover 2 and the through hole 6.

[0040] It should be noted that the joint of the shell 1 and the top cover 2 and the through hole 6 are the key parts of the device that contact the outside world, and the elastic sealing medium arranged therein can effectively prevent heat leakage, strengthen the sealing of the device, and maintain the stability of the internal thermal environment.

[0041] In some embodiments, the elastic sealing medium 5 is epoxy resin.

[0042] It should be noted that the epoxy resin has good sealing property, chemical corrosion resistance and insulation. It can firmly fill the part to be sealed, form an effective sealing barrier, and at the same time will not chemically react with other substances in the device, ensuring the safety and reliability of the experiment.

[0043] In some embodiments, the phase change material 7 is paraffin.

[0044] It should be noted that the phase change material is the core object of the entire experimental study. By observing and measuring its phase change process under different conditions, the specific heat and latent heat parameters can be calculated, providing students with an intuitive experimental observation object and helping them understand the characteristics of phase change materials. Paraffin is a common and stable phase change material, and its phase change process is relatively obvious, making it easy for students to observe and record. At the same time, paraffin is relatively inexpensive, widely available, and its particle size can be adjusted at any time according to experimental needs, so paraffin is extremely suitable for use in teaching experiments.

[0045] In some embodiments, the shell 1 is one of a cylindrical shape and a square shape.

[0046] It should be noted that these two shapes are simple and regular, making them easy to manufacture and process. During the experiment, the regular shape is beneficial for uniform heat distribution, and it is also convenient for students to operate and place the device, and it is beneficial for standardized production and rational arrangement of the experimental table.

[0047] The applicant further provides the following reference specific embodiments to describe the present application. It should be noted that these embodiments are only descriptive and do not limit the present application in any way.

[0048] Example 1

[0049] This embodiment provides a teaching experiment device for measuring the specific heat and latent heat of phase change materials, which includes a cylindrical nanoceramic aluminum alloy shell 1, a nanoceramic aluminum alloy top cover 2, a temperature sensor 3, an aluminum metal framework 4 with arrayed through holes, and a phase change material 7.

[0050] The top end of the shell 1 is provided with a top cover 2 for sealing the shell 1; a metal framework 4 is arranged in the interior of the shell 1, and the outer edge of the metal framework 4 is matched with the inner cavity of the shell 1, so that the metal framework 4 is stably arranged in the inner cavity of the shell 1, and the horizontal distance between adjacent through holes of the metal framework is 1.2-2.5 mm, the vertical distance is 1.2-2.5 mm, and the diameter of the through hole is 0.8-2.0 mm; a phase change material 7 is filled in the through hole of the metal framework; the top cover 2 is provided with a through hole 6, so that the temperature sensing probe of the temperature sensor 3 extends into the through hole of the metal framework 4 in the inner cavity of the aluminum alloy shell 1 to measure the temperature of the inner cavity of the aluminum alloy shell 1.

[0051] The junction of the shell 1 and the top cover 2, and the through hole 6 are all provided with epoxy resin for sealing the gap or gap.

[0052] In the teaching experiment, first, the temperature probe of the temperature sensor 3 is accurately placed in the through hole at the center of the metal framework 4. The central position can maximize the reflection of the overall temperature condition in the device, thereby realizing accurate measurement of the temperature. Then the phase change material 7 paraffin is poured into the through hole of the metal framework 4 in the device, and hot water with a specific temperature is injected into the device, and the amount of hot water needs to completely cover the phase change material 7, so as to ensure that the phase change material can fully and uniformly absorb heat. After completing the water injection operation, the top cover is quickly tightened to reduce heat loss. Then, the connection between the aluminum alloy shell 1 and the top cover 2 is sealed by using epoxy resin. At the same time, the through hole 6 through which the temperature sensor 3 passes is also sealed by applying epoxy resin, further strengthening the sealing of the device to prevent heat exchange through the through hole. After completing the above series of operations, when the temperature displayed by the temperature sensor tends to be stable, it indicates that the device has reached thermal equilibrium. At this time, the stable temperature value is accurately recorded. Finally, according to the law of conservation of energy, the data obtained in the experiment is analyzed, so as to deduce the phase change latent heat and specific heat of the phase change material.

[0053] The above is the preferred embodiment of the present application and does not limit the present application. Although the present application is described in detail with reference to the examples, those skilled in the art can modify the technical solutions described in the foregoing examples or make equivalent replacement of part of the technical features, but any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials, characterized in that, Includes outer shell (1), top cover (2), temperature sensor (3), metal frame (4), phase change material (7): The top cover (2) is provided at the top of the outer shell (1) for sealing the outer shell (1). The metal frame (4) is disposed in the inner cavity of the outer shell (1); and the metal frame (4) has through holes, and the phase change material (7) is filled in the through holes of the metal frame (4); The top cover (2) has a through hole (6), and the temperature sensor (3) has its temperature probe placed inside the through hole of the metal frame (4) along the through hole (6) to measure the temperature of the inner cavity of the outer shell (1).

2. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 1, characterized in that: The metal skeleton (4) includes multiple through holes arranged in an array to form a matrix metal skeleton (4).

3. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 2, characterized in that: The lateral spacing between adjacent through holes is 1.2~2.5 mm, and the longitudinal spacing is 1.2~2.5 mm; the diameter of the through holes is 0.8~2.0 mm.

4. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 1, characterized in that: The outer edge of the metal frame (4) is adapted to the inner cavity of the outer shell (1), so that the metal frame (4) is stably set in the inner cavity of the outer shell (1).

5. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 1, characterized in that: The metal skeleton (4) is made of one of copper, aluminum, or silver; The outer shell (1) is made of either nano-ceramic aluminum alloy or titanium alloy. The top cover (2) is made of either nano-ceramic aluminum alloy or titanium alloy.

6. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 1, characterized in that: It also includes an elastic sealing medium (5) for the open heat conduction part of the sealing device.

7. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 6, characterized in that: The open heat conduction part includes the fitting area between the outer shell (1) and the top cover (2) and the through hole (6).

8. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 6, characterized in that: The elastic sealing medium (5) is epoxy resin.

9. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 1, characterized in that: The phase change material (7) is paraffin.

10. The teaching experimental apparatus for measuring the specific heat and latent heat of phase change materials according to claim 1, characterized in that: The outer shell (1) is either cylindrical or square.

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