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Device and method for measuring specific heat capacity through double-flow method

A measurement method and technology of specific heat capacity, which are used in the measurement of specific heat capacity of fluid working medium in industry and scientific research. Simplified experimental process and stable signal

Active Publication Date: 2021-05-04
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The flow-type adiabatic calorimetry method is mainly aimed at fluids with high pressure. The measurement method is relatively simple, the temperature and pressure measurement range is relatively wide, and the measurement accuracy is relatively high. It is currently the most commonly used measurement method. However, using this method to measure specific heat When measuring, it will be found that for two substances with very small difference in specific heat capacity, it is almost difficult or even impossible to distinguish the difference between the two
For dilute electrolyte solutions, the difference between the specific heat capacity of the solution and the specific heat capacity of the solvent is extremely small, and effective results cannot be obtained by direct measurement; in addition, this problem also exists in some organic solution mixtures. distinguish the difference

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  • Device and method for measuring specific heat capacity through double-flow method
  • Device and method for measuring specific heat capacity through double-flow method
  • Device and method for measuring specific heat capacity through double-flow method

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specific Embodiment

[0081] Specific embodiment: the specific heat capacity measurement of sodium chloride solution

[0082] Using water with rich thermophysical properties as a standard substance, five concentrations of sodium chloride solutions of 0.2, 0.1, 0.05, 0.03 and 0.1mol / kg were prepared, and the specific heat capacity at 0.1MPa and 30°C was measured. In order to verify For the reproducibility of the experiment, each concentration was repeated three times, and the specific experimental results are shown in Table 1.

[0083] For the measurement of the specific heat capacity of dilute solutions, it is generally used to obtain the apparent molar heat capacity. The measurement results of this experiment are also calculated to obtain the corresponding apparent molar heat capacity value and compared with the literature value. It can be seen that the calculated value is consistent with the literature value. The deviation is small.

Embodiment 1

[0084] Table 1 embodiment 1 specific heat capacity measurement result

[0085]

[0086] In the table, m is the mass molar concentration, is the calculated apparent molar heat capacity, is the apparent molar heat capacity given in the literature, and Δ is the deviation between the calculated value and the literature value.

[0087] In the present invention, two identical U-shaped pipeline structures are set. During the experiment, the standard substance is used as a reference to collect the Wheatstone bridge signal after the standard substance is heated and stabilized; the front end of the inlet pipeline is switched to the standby After measuring the sample, by controlling the voltage at both ends of the heating wire, the output signal of the voltage difference of the Wheatstone bridge is kept consistent with that before; Finally, the specific heat capacity of the sample to be tested is obtained through data processing. The device of the invention only needs 10-15 minut...

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Abstract

The invention discloses a device and a method for measuring a specific heat capacity through a double-flow method. The device comprises a calorimeter component and a heating control component. The calorimeter component comprises a vacuum cavity, a lower flange and an upper flange end cover matched with the lower flange are arranged at the top of the vacuum cavity, and a vacuumizing pipeline is arranged on the upper flange end cover; a second U-shaped pipe and a first U-shaped pipe which are the same in structure are arranged in the vacuum cavity, the upper ends of the second U-shaped pipe and the first U-shaped pipe are both connected with the lower end of a two-way pipe, heating wires are wound on the outer sides of the second U-shaped pipe and the first U-shaped pipe, and through holes of a first temperature sensor and a second temperature sensor are formed in the two ends of the heating wires respectively; and the heating control component is positioned outside the calorimeter and is connected with the heating wire. The device can accurately measure the specific heat capacity of a liquid, is good in stability and wide in measurable temperature and pressure range, can be used for specific heat measurement of dilute electrolyte solutions and organic matters in industry and scientific research, and can also be used for teaching of course experiments of energy and power related professions.

Description

technical field [0001] The invention belongs to the technical field of fluid thermophysical property measurement, and in particular relates to a specific heat capacity measurement device and method, which can be used for the teaching of professional course experiments related to energy, power and thermodynamics, and can also be used for measuring the specific heat capacity of fluid working fluids in industry and scientific research Measurement. Background technique [0002] Specific heat capacity is one of the most important thermophysical properties of fluids, which characterizes the ability of objects to absorb or dissipate heat. Different substances have different specific heat capacities, and the specific heat capacity of the same substance will change with temperature. Specific heat capacity is one of the primary parameters obtained in the field of energy and chemical engineering. It is widely used in actual production and life. It has important application value in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/00G01N25/20
CPCG01N25/005G01N25/20
Inventor 归凌燕孟现阳吴江涛
Owner XI AN JIAOTONG UNIV
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