A device and method for measuring specific vaporization heat of liquid

Abstract

The embodiment of the present invention discloses a measuring device and a measuring method for the specific heat of vaporization of a liquid, which relates to the field of thermodynamics and can effectively reduce experimental errors. The measuring method comprises: recording the weight value M1 of the current calorimeter displayed by the liquid crystal display module; adding the second liquid to the calorimeter, recording the total weight value M2 of the current calorimeter and the second liquid displayed by the liquid crystal display module and the current temperature T1 of the second liquid; turning on the electric heater to heat the first liquid in the steam generator; observing the temperature T2 of the current mixed liquid of the second liquid and the third liquid displayed by the display module; turning off the electric heater; recording the total weight value M3 of the current calorimeter, the second liquid and the third liquid displayed by the liquid crystal display module and the current temperature T2 of the mixed liquid of the second liquid and the third liquid; calculating the specific heat of vaporization of the first liquid according to the formula of the specific heat of vaporization of the liquid. The present invention is suitable for measuring the specific heat of vaporization of liquids.

Description

Technical Field

[0001] The invention relates to the field of thermodynamics, and in particular to a device and method for measuring specific vaporization heat of liquid. Background Art

[0002] The determination of the specific heat of vaporization of liquids is a required thermal experiment in the university physics experiment course. However, during the experiment, many students' experimental data have large errors. It is common for the error to be in the range of 5%-10%, and there are also many that exceed 10%. In addition, the probability of the experimental result being too small is much greater than the probability of being too large. The main reason is that the use of a mercury thermometer to measure the temperature of the water in the cup in the calorimeter is inaccurate, and the method of measuring with a mercury thermometer when the calorimeter is turned on causes the heat to dissipate, resulting in a small experimental result. In addition, when measuring the mass after the experiment, the calorimeter needs to be removed and measured with a balance. The operation process is cumbersome and easy to cause experimental errors. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a device and method for measuring specific heat of vaporization of a liquid, which can effectively reduce experimental errors.

[0004] In a first aspect, a first embodiment of the present invention provides a device for measuring specific heat of vaporization of a liquid, comprising: a bracket for supporting and fixing an electric heater and a steam generator; an electric heater placed on the bracket for heating the steam generator to evaporate a first liquid in the steam generator; a steam generator placed on the upper side of the electric heater for containing the first liquid; a conduit, one end of which is located in the steam generator and the other end of which is located in a calorimeter for introducing steam generated in the steam generator into the calorimeter; a calorimeter for containing a second liquid whose initial temperature is lower than room temperature so that the steam is condensed into a third liquid, the calorimeter being placed on the upper side of a pressure sensor module; and a pressure sensor module and a control module. connected to measure the weight of the calorimeter and send the measured weight value to the control module; a temperature sensor module is placed in the calorimeter and connected to the control module, and is used to measure the temperature of the mixed liquid of the second liquid and the third liquid in the calorimeter, and send the measured temperature value to the control module; the control module is used to receive the weight value sent by the pressure sensor module and the temperature value sent by the temperature sensor module, and send the weight value and temperature value to the liquid crystal display module so that the liquid crystal display module displays the weight value and temperature value; the liquid crystal display module is used to display the weight value and temperature value sent by the control module; the first liquid, the second liquid and the third liquid are liquids with the same physical composition.

[0005] According to a specific implementation of an embodiment of the present invention, the calorimeter includes an inner cup and an insulating outer layer located outside the inner cup, a stirrer is provided in the inner cup, and the second liquid is located in the inner cup; a waterproof protective layer is provided on the outside of the temperature sensor module, and the temperature sensor module is located in the second liquid; one end of the conduit is located above the liquid level of the first liquid, and the other end is located in the second liquid; the heater is provided with an openable top cover.

[0006] According to a specific implementation of an embodiment of the present invention, a through hole is provided at the bottom of the thermal insulation outer layer of the calorimeter, and a protrusion is provided on the pressure sensor module to fit with the through hole; the temperature sensor module is located at the upper end of the protrusion and fits with the bottom of the inner cup of the calorimeter.

[0007] According to a specific implementation of the embodiment of the present invention, the control module is further connected to a clock display module, and the clock display module is used to display the current time and / or timing.

[0008] According to a specific implementation of the embodiment of the present invention, the control module is further connected to an input module, and the input module is used to set the heating temperature and heating time of the electric heater.

[0009] In a second aspect, embodiment 2 of the present invention provides a method for measuring the specific heat of vaporization of a liquid, the method comprising: recording a weight value M1 of the current calorimeter displayed by a liquid crystal display module; adding a second liquid into the calorimeter, recording a total weight value M2 of the current calorimeter and the second liquid displayed by the liquid crystal display module and a current temperature T1 of the second liquid; calculating a temperature difference ΔT between the current room temperature and T1; turning on an electric heater to heat a first liquid in a steam generator; observing a temperature T2 of a mixture of the current second liquid and the third liquid displayed by the display module; when the temperature difference between T2 and the current room temperature is ΔT, turning off the electric heater; recording a total weight value M3 of the current calorimeter, the second liquid and the third liquid displayed by the liquid crystal display module and a current temperature T2 of a mixture of the second liquid and the third liquid; and calculating the specific heat of vaporization of the first liquid according to the formula for the specific heat of vaporization of the liquid.

[0010] According to a specific implementation of an embodiment of the present invention, before turning on the electric heater to heat the first liquid in the steam generator, the method also includes: opening the top cover of the steam generator; after turning on the electric heater to heat the first liquid in the steam generator, the method also includes: after the electric heater heats the steam generator for a preset time, covering the top cover of the steam generator.

[0011] According to a specific implementation of an embodiment of the present invention, before recording the current temperature value T1 of the second liquid displayed by the liquid crystal display module, the method also includes: stirring the second liquid evenly with a stirrer; before recording the current temperature T2 of the mixture of the second liquid and the third liquid displayed by the liquid crystal display module, the method also includes: stirring the mixture of the second liquid and the third liquid evenly with a stirrer.

[0012] According to a specific implementation method of an embodiment of the present invention, the time when the electric heater starts heating and the time when the heating ends are recorded, and the time difference between the time when the heating ends and the time when the heating starts is calculated; or the timing is started when the electric heater is turned on, and the timing is ended when the electric heater stops heating, and the timing duration is recorded.

[0013] According to a specific implementation of the embodiment of the present invention, before turning on the electric heater to heat the first liquid in the steam generator, the method further includes: setting a heating temperature and a heating time of the electric heater.

[0014] An embodiment of the present invention provides a device and method for measuring specific heat of vaporization of a liquid. The calorimeter is always placed on the upper side of the pressure sensor module. On the one hand, there is no need to remove the calorimeter after the experiment and measure it with a balance, which reduces the experimental error caused by cumbersome operations; on the other hand, the weight value measured by the pressure sensor is more accurate than the weight value weighed by the balance, which can reduce the error of the measured weight value; in this embodiment, a temperature sensor module is used to measure the temperature. Compared with a mercury thermometer, the temperature measured by the temperature sensor is more accurate, and the temperature sensor module in this embodiment is always located in the inner cup of the calorimeter. There is no need to open the calorimeter to measure the temperature, which reduces the heat loss, thereby effectively reducing the experimental error. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of a device for measuring specific heat of vaporization of a liquid according to a first embodiment of the present invention;

[0017] Figure 2 This is a flow chart of a method for measuring specific heat of vaporization of a liquid according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In a first aspect, embodiment 1 of the present invention provides a device for measuring specific heat of vaporization of liquid, which can effectively reduce experimental errors.

[0021] like Figure 1 As shown, the device for measuring specific vaporization heat of liquid provided in the first embodiment of the present invention comprises: a bracket 1, used for supporting and fixing an electric heater and a steam generator; an electric heater 2, placed on the bracket 1, used for heating a steam generator 3, so that a first liquid in the steam generator 3 evaporates; the steam generator 3, placed on the upper side of the electric heater 2, used for containing the first liquid; a conduit 4, one end of which is located in the steam generator 3, and the other end of which is located in a calorimeter 5, used for introducing the steam generated in the steam generator 3 into the calorimeter 5; the calorimeter 5, used for containing a second liquid whose initial temperature is lower than room temperature, so that the steam condenses into a third liquid, and the calorimeter 5 is placed on the upper side of a pressure sensor module 6; the pressure sensor module 6 is connected to the control module The calorimeter 5 is connected to the control module 8 for measuring the weight of the calorimeter 5 and sending the measured weight value to the control module 8; the temperature sensor module 7 is placed in the calorimeter 5 and connected to the control module 8 for measuring the temperature of the mixed liquid of the second liquid and the third liquid in the calorimeter 5 and sending the measured temperature value to the control module 8; the control module 8 is used to receive the weight value sent by the pressure sensor module 6 and the temperature value sent by the temperature sensor module 7, and send the weight value and temperature value to the liquid crystal display module so that the liquid crystal display module displays the weight value and temperature value; the liquid crystal display module is used to display the weight value and temperature value sent by the control module; the first liquid, the second liquid and the third liquid are liquids with the same physical composition.

[0022] In this embodiment, the calorimeter is always placed on the upper side of the pressure sensor module. On the one hand, it is not necessary to remove the calorimeter after the experiment and measure it with a balance, which reduces the experimental error caused by cumbersome operation; on the other hand, the weight value measured by the pressure sensor is more accurate than the weight value weighed by the balance, which can reduce the error of the measured weight value. In this embodiment, the temperature is measured by a temperature sensor module. Compared with a mercury thermometer, the temperature measured by the temperature sensor is more accurate. In addition, the temperature sensor module in this embodiment is always located in the inner cup of the calorimeter. There is no need to open the calorimeter to measure the temperature, which reduces the heat loss, thereby effectively reducing the experimental error. The liquid crystal display module in this embodiment can display the weight value measured by the pressure sensor module and the temperature value measured by the temperature sensor module in real time, which is convenient for the experimenter to observe and record at any time during the experiment. In addition, the calorimeter in this embodiment is always located on the upper side of the pressure sensor module, and the temperature sensor module is always located in the calorimeter. There is no need for the experimenter to manually measure the temperature and weight, which simplifies the experimental operation steps, thereby reducing the experimental error caused by the cumbersome operation process.

[0023] The measuring device of liquid specific vaporization heat provided in this embodiment can realize intelligent detection of physical quantities such as temperature and weight, so as to improve students' initiative to explore physical laws. In addition, the control module in this embodiment can adopt STC89C52 single-chip microcomputer, and the measuring device adopting STC89C52 single-chip microcomputer can be used for practical teaching of "51 single-chip microcomputer technology", so that students can learn and master the theoretical knowledge of single-chip microcomputer technology in practice; because the system structure design is simple and the application materials are relatively common, students can take advantage of the opportunity of course design to make it by themselves, which can not only greatly improve students' hands-on ability, but also greatly cultivate students' interest in independent research and development, and promote the formation of students' innovative thinking ability.

[0024] Optionally, the measuring device further includes a power supply module, wherein the power supply module is connected to the control module and is used to supply power to the control module.

[0025] Optionally, the temperature sensor module adopts a DS18B20 digital temperature sensor.

[0026] In this embodiment, the DS18B20 digital temperature sensor outputs a digital signal, which is convenient for reading the temperature value; and the DS18B20 digital temperature sensor has the characteristics of small size, low hardware overhead and high precision, which is conducive to arranging the temperature sensor module in the calorimeter, and can reduce the cost of the measuring device and improve the measurement accuracy.

[0027] Optionally, the pressure sensor module includes a pressure sensor and an HX711A / D converter chip.

[0028] In this embodiment, the HX711 A / D converter chip has the advantages of high integration, fast response speed, strong anti-interference, etc., which improves the performance and reliability of the pressure sensor module.

[0029] Optionally, the liquid crystal display module adopts an LCD12864 liquid crystal display module.

[0030] In this embodiment, the LCD display solution composed of the LCD12864 liquid crystal display module is much simpler in hardware circuit structure and display program than the same type of graphic dot matrix liquid crystal display module, and the price of this module is slightly lower than that of the graphic liquid crystal module with the same dot matrix.

[0031] As an optional implementation of an embodiment of the present invention, the calorimeter includes an inner cup and an insulating outer layer located outside the inner cup, an agitator is provided in the inner cup, and the second liquid is located in the inner cup; a waterproof protective layer is provided on the outside of the temperature sensor module, and the temperature sensor module is located in the second liquid; one end of the conduit is located above the liquid level of the first liquid, and the other end is located in the second liquid; the heater is provided with an openable top cover.

[0032] In this embodiment, the heat-insulating outer layer of the calorimeter can reduce the heat absorption or heat dissipation of the liquid in the calorimeter, thereby improving the heat-insulating performance of the calorimeter and helping to reduce experimental errors. The waterproof protective layer can play an insulating role and protect the temperature sensor module. The temperature sensor module is located in the second liquid and can more accurately measure the temperature of the liquid in the cup of the calorimeter.

[0033] In this embodiment, one end of the conduit is located above the liquid surface of the first liquid, so that the steam after evaporation of the first liquid can enter the conduit; the other end of the conduit is located in the second liquid, so that the steam entering the conduit from the steam generator can directly pass into the second liquid whose initial temperature is lower than room temperature, thereby condensing the steam into a third liquid.

[0034] In this embodiment, before turning on the electric heater to heat the first liquid in the steam generator, the top cover of the steam generator can be opened first, and then the electric heater is turned on to heat the first liquid in the steam generator to discharge steam below the boiling point. After the first liquid boils, the top cover of the steam generator is covered to allow the steam to enter the calorimeter from the conduit.

[0035] In this embodiment, at the beginning of the experiment, the second liquid is stirred evenly with a stirrer, and then the current temperature value of the second liquid displayed on the liquid crystal display module is recorded; at the end of the experiment, the mixture of the second liquid and the third liquid is stirred evenly with a stirrer, and then the current temperature value of the mixture of the second liquid and the third liquid displayed on the liquid crystal display module is recorded. In this embodiment, the liquid is first stirred evenly with a stirrer before recording the temperature value of the liquid, so that the liquid can be mixed evenly, the temperature of each part of the liquid is the same, and the experimental error caused by the uneven temperature inside the liquid is reduced.

[0036] Optionally, a through hole is provided on the calorimeter, and the agitator comprises a stirring ring and a stirring rod, wherein the stirring ring is fixed to one end of the stirring rod, and the other end of the stirring rod extends out of the calorimeter through the through hole.

[0037] In this embodiment, the stirring rod of the stirrer can be moved up and down. When stirring the liquid in the calorimeter, the stirring rod can be gently moved up and down, so that the stirring ring located in the calorimeter stirs the liquid in the calorimeter. The stirrer provided in this embodiment does not need to be taken out of the calorimeter during the experiment, thereby reducing the heat exchange between the liquid in the calorimeter and the outside world and reducing experimental errors.

[0038] As an optional implementation of the embodiment of the present invention, a through hole is provided at the bottom of the thermal insulation outer layer of the calorimeter, and a protrusion is provided on the pressure sensor module to fit with the through hole; the temperature sensor module is located at the upper end of the protrusion and fits with the bottom of the inner cup of the calorimeter.

[0039] In this embodiment, since the temperature of the inner cup of the calorimeter is the same as the temperature of the liquid in the inner cup, the temperature sensor module is attached to the bottom of the inner cup of the calorimeter to accurately measure the temperature of the liquid in the inner cup. During the experiment, since the temperature sensor module is fixed on the pressure sensor module, it is no longer necessary to place the temperature sensor module inside the calorimeter, thereby facilitating the addition of the second liquid into the calorimeter before the experiment and pouring out the liquid in the calorimeter after the experiment; in addition, it is also convenient for the stirrer to stir the liquid in the calorimeter.

[0040] As an optional implementation of the embodiment of the present invention, the control module is further connected to a clock display module, and the clock display module is used to display the current time and / or timing.

[0041] In this embodiment, the clock display module connected to the control module facilitates the experimenter to record the experiment time, for example, summarizing the time required for each complete experiment, obtaining a statistical result, and reasonably arranging the students' experiment class time according to the statistical result.

[0042] As an optional implementation of the embodiment of the present invention, the control module is further connected to an input module, and the input module is used to set the heating temperature and heating time of the electric heater.

[0043] In this embodiment, the heating temperature and heating time of the electric heater can be set by using the input module according to the optimal heating temperature and heating time of the electric heater summarized from multiple experiments, so as to achieve better experimental results. The input module can be a keyboard.

[0044] In a second aspect, Embodiment 2 of the present invention provides a method for measuring specific heat of vaporization of a liquid, which can effectively reduce experimental errors.

[0045] like Figure 2 As shown, the method for measuring specific heat of vaporization of a liquid provided in the second embodiment of the present invention includes:

[0046] Step 101, recording the current weight M1 of the calorimeter displayed by the liquid crystal display module;

[0047] In this embodiment, optionally, a stirrer is provided in the calorimeter, and the stirrer does not need to be taken out of the calorimeter during the experiment, and the total weight M1 of the current calorimeter and the stirrer displayed by the liquid crystal display module is recorded.

[0048] Step 102, adding a second liquid into the calorimeter, and recording the total weight M2 of the calorimeter and the second liquid and the current temperature value T1 of the second liquid displayed by the liquid crystal display module;

[0049] In this embodiment, optionally, the calorimeter is provided with a stirrer, and the stirrer does not need to be taken out of the calorimeter during the experiment, and the total weight M2 of the current calorimeter, the stirrer and the second liquid displayed by the liquid crystal display module is recorded.

[0050] In this embodiment, optionally, a small amount of water is placed in the calorimeter, and then ice water is added to form a second liquid, so that the amount of water is about 2 / 3 cup, the water temperature is 5-10°C lower than the room temperature, and no condensation can occur outside the calorimeter.

[0051] Optionally, before recording the current temperature value T1 of the second liquid displayed by the LCD module, the method also includes: stirring the second liquid evenly with a stirrer, so that the second liquid in the calorimeter can be evenly mixed, so that the temperature of each part of the liquid is the same, reducing the experimental error caused by uneven temperature inside the liquid.

[0052] Step 103, calculating the temperature difference ΔT between the current room temperature and T1;

[0053] In this embodiment, the temperature difference ΔT between T1 and the current room temperature should be appropriate, and the steam passing time should be controlled so that the temperature difference between the room temperature and T1 and the temperature difference between T2 and the room temperature are as close as possible. In this way, the heat absorbed by the second liquid from the outside and the heat emitted to the outside can be as close as possible, thereby reducing the experimental error.

[0054] Step 104, turning on the electric heater to heat the first liquid in the steam generator;

[0055] In this embodiment, optionally, before turning on the electric heater to heat the first liquid in the steam generator, the top cover of the steam generator can be opened first, and then the electric heater is turned on to heat the first liquid in the steam generator to discharge steam below the boiling point. After the first liquid boils, the top cover of the steam generator is covered to allow the steam to enter the calorimeter from the conduit. This embodiment can make the steam entering the calorimeter meet the experimental requirements as much as possible, thereby making the calculation of heat more accurate and reducing experimental errors.

[0056] Step 105, observing the current temperature T2 of the mixed liquid of the second liquid and the third liquid displayed by the liquid crystal display module;

[0057] In this embodiment, the temperature of the mixture of the second liquid and the third liquid displayed on the liquid crystal display module is observed in real time, which facilitates the control of the experiment and enables the experimenter to stop the electric heater from heating the steam generator in time when T2 reaches a suitable value, thereby achieving better experimental results.

[0058] Step 106: When the temperature difference between T2 and the current room temperature is ΔT, turn off the electric heater;

[0059] In this embodiment, when the temperature difference between T2 and room temperature and the temperature difference between room temperature and T1 are as close as possible, turning off the electric heater can make the heat absorbed by the second liquid from the outside and the heat dissipated to the outside as close as possible, thereby reducing experimental errors.

[0060] Step 107, recording the total weight M3 of the current calorimeter, the second liquid and the third liquid and the current temperature T2 of the mixed liquid of the second liquid and the third liquid displayed by the liquid crystal display module;

[0061] In this embodiment, optionally, when the calorimeter is provided with a stirrer, the total weight M3 of the current calorimeter, the stirrer, the second liquid and the third liquid displayed by the liquid crystal display module is recorded.

[0062] In this embodiment, optionally, before recording the current temperature T2 of the mixture of the second liquid and the third liquid displayed by the liquid crystal display module, the method also includes: stirring the mixture of the second liquid and the third liquid evenly with a stirrer, so that the liquids can be mixed evenly, the temperatures of various parts of the liquids are the same, and the experimental errors caused by uneven internal temperatures of the liquids are reduced.

[0063] Step 108: Calculate the specific heat of vaporization of the first liquid according to the formula for the specific heat of vaporization of the liquid.

[0064] In this embodiment, optionally, according to the heat balance equation: (M3-M2)×L+(M3-M2)×C W (T3-T2)=[(M2-M1)×C W +M1×C A1 ]×(T2-T1), thus, the formula for the specific heat of vaporization of the liquid is:

[0065]

[0066] Where, L is the specific heat of vaporization of the first liquid, C W is the specific heat capacity of the first liquid, C A1 is the specific heat capacity of the calorimeter, and T3 is the temperature of the vapor of the first liquid (T3 is an inherent property of the first liquid itself, for example, if the first liquid is water, then T3 is the temperature of water vapor, and under standard atmospheric pressure, T3 = 100°C).

[0067] It is understandable that the specific heat of vaporization formula provided in this embodiment is not unique, and experimenters can make corresponding adjustments according to actual needs.

[0068] As an optional implementation of the embodiment of the present invention, the time when the electric heater starts heating and the time when the heating ends are recorded, and the time difference between the time when the heating ends and the time when the heating starts is calculated; or

[0069] The timing starts when the electric heater is turned on, and ends when the electric heater stops heating, and the timing duration is recorded.

[0070] This embodiment facilitates the experimenter to record the experiment time, for example, to summarize the time required for each complete experiment, obtain a statistical result, and reasonably arrange the students' experiment class time according to the statistical result.

[0071] As an optional implementation of the embodiment of the present invention, before turning on the electric heater to heat the first liquid in the steam generator, the method further includes: setting a heating temperature and a heating time of the electric heater.

[0072] In this embodiment, the heating temperature and heating time of the electric heater can be set using the input module according to the optimal heating temperature and heating time of the electric heater summarized from multiple experiments, thereby achieving better experimental results.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for measuring specific heat of vaporization of a liquid, characterized in that: The method is implemented based on a measuring device for specific vaporization heat of a liquid, wherein the measuring device for specific vaporization heat of a liquid comprises a bracket for supporting and fixing an electric heater and a steam generator; an electric heater, which is placed on the bracket, for heating the steam generator so that a first liquid in the steam generator evaporates; a steam generator, which is placed on the upper side of the electric heater, for containing the first liquid; a conduit, one end of which is located in the steam generator and the other end of which is located in a calorimeter, for introducing steam generated in the steam generator into the calorimeter; a calorimeter, which is used to contain a second liquid whose initial temperature is lower than room temperature so that the steam condenses into a third liquid, and the calorimeter is placed on the upper side of a pressure sensor module; a pressure sensor module connected to the control module, used to measure the weight of the calorimeter and send the measured weight value to the control module; a temperature sensor module placed in the calorimeter and connected to the control module, used to measure the temperature of the mixture of the second liquid and the third liquid in the calorimeter, and send the measured temperature value to the control module; the control module is used to receive the weight value sent by the pressure sensor module and the temperature value sent by the temperature sensor module, and send the weight value and temperature value to the liquid crystal display module so that the liquid crystal display module displays the weight value and temperature value; the liquid crystal display module is used to display the weight value and temperature value sent by the control module; The first liquid, the second liquid and the third liquid are liquids with the same physical composition; the calorimeter comprises an inner cup and an insulating outer layer located outside the inner cup, a stirrer is provided in the inner cup, and the second liquid is located in the inner cup; a waterproof protective layer is provided on the outer side of the temperature sensor module, and the temperature sensor module is located in the second liquid; one end of the conduit is located above the liquid level of the first liquid, and the other end is located in the second liquid; the heater is provided with an openable top cover; a through hole is provided at the bottom of the insulating outer layer of the calorimeter, and a protrusion is provided on the pressure sensor module to fit with the through hole; the temperature sensor module is located at the upper end of the protrusion and fits the bottom of the inner cup of the calorimeter; the control module is also connected to a clock display module, and the clock display module is used to display the current time and / or timing; the control module is also connected to an input module, and the input module is used to set the heating temperature and heating time of the electric heater; Record the current calorimeter weight value M1 displayed by the LCD module; Add the second liquid into the calorimeter, and record the total weight value M2 of the calorimeter and the second liquid and the current temperature T1 of the second liquid displayed by the liquid crystal display module; The calorimeter is filled with water and ice water to form a second liquid, the amount of water is 2 / 3 cup, the water temperature is 5-10°C lower than the room temperature, and there is no condensation outside the calorimeter; Calculate the temperature difference ΔT between the current room temperature and T1; Turning on the electric heater to heat the first liquid in the steam generator; Record the time when the electric heater starts heating and the time when it stops heating, and calculate the time difference between the time when heating stops and the time when heating starts; or The timing starts when the electric heater is turned on, and ends when the electric heater stops heating, and the timing duration is recorded; Observe the current temperature T2 of the mixed liquid of the second liquid and the third liquid displayed by the display module; When the temperature difference between T2 and the current room temperature is ΔT, turn off the electric heater; Record the total weight value M3 of the current calorimeter, the second liquid and the third liquid and the current temperature T2 of the mixed liquid of the second liquid and the third liquid displayed by the liquid crystal display module; The specific heat of vaporization of the first liquid is calculated according to the specific heat of vaporization formula of the liquid.

2. The method according to claim 1, characterized in that Before turning on the electric heater to heat the first liquid in the steam generator, the method further includes: Opening the top cover of the steam generator; After turning on the electric heater to heat the first liquid in the steam generator, the method further includes: After the electric heater heats the steam generator for a preset time, the top cover of the steam generator is closed.

3. The method according to claim 1, characterized in that Before recording the current temperature value T1 of the second liquid displayed by the liquid crystal display module, the method further includes: Stir the second liquid evenly with a stirrer; Before recording the current temperature T2 of the mixed liquid of the second liquid and the third liquid displayed by the liquid crystal display module, the method further includes: The mixture of the second liquid and the third liquid is stirred evenly by a stirrer.

4. The method according to claim 1, characterized in that: Before turning on the electric heater to heat the first liquid in the steam generator, the method further includes: setting a heating temperature and a heating time of the electric heater.

Images