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Liquid specific heat capacity measuring device capable of realizing self-balanced pressurization and measuring method

A measuring device and technology of specific heat capacity, applied in the direction of thermal development of materials, etc., can solve the problems of inability to accurately measure the specific heat capacity of volatile liquids, and achieve the effect of saving experimental time and convenient adjustment

Inactive Publication Date: 2014-06-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem that the prior art cannot accurately measure the specific heat capacity of volatile liquids

Method used

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  • Liquid specific heat capacity measuring device capable of realizing self-balanced pressurization and measuring method
  • Liquid specific heat capacity measuring device capable of realizing self-balanced pressurization and measuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Such as figure 1 As shown, a liquid specific heat capacity measuring device capable of self-balanced pressurization includes interconnected pressure balance mechanism and measurement mechanism, and the pressure balance mechanism includes:

[0066] Liquid storage tank 3;

[0067] The liquid inlet pipe 5 is located on the outside of the liquid storage tank, the liquid inlet pipe is provided with a first valve 4, and one end of the liquid inlet pipe is connected with the liquid storage tank;

[0068] The liquid outlet pipe 7 is located on the outside of the liquid storage tank, and the second valve 6 is arranged on the liquid outlet pipe, and one end is fixed with the liquid storage tank, and the other end is fixed with the measuring mechanism;

[0069] The sampling pipe 2 is located at the middle and lower part of the liquid storage tank, and the fifth valve 1 is arranged on the sampling pipe.

[0070] Measuring agencies include:

[0071] The heating box 11 has heating...

Embodiment 2

[0093] Such as figure 2 As shown, in this implementation, on the basis of Embodiment 1, the comparison tank, the comparison pool, the second temperature sensor and the second heat flow measurement element are removed.

[0094] The method for measuring the specific heat capacity of the refrigerant difluorochloromethane (R22) using the device of this embodiment comprises the following steps:

[0095] 1) Open the first valve 4 and the second valve 6, vacuumize the liquid storage tank 3 and the measuring pool 18, close the first valve 4 after vacuuming, so that the liquid storage tank and the measuring pool form a closed cavity, heat The element 20 works to uniformly heat the heating measuring pool, and measure the temperature signal T' of the outer wall of the measuring pool and the heat flow signal HF of the outer wall of the measuring pool when the inside of the measuring pool is in a vacuum state blank ;

[0096] 2) Fill the cooling medium inlet 21 with cold water or air to...

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Abstract

The invention discloses a liquid specific heat capacity measuring device capable of realizing self-balanced pressurization and a measuring method. The device comprises a pressure balancing mechanism and a measuring mechanism which are communicated to each other, wherein the pressure balancing mechanism comprises a liquid storage tank, a liquid inlet pipe with a first valve and a liquid outlet pipe with a second valve; one end of the liquid outlet pipe is fixed with the liquid storage tank and the other end of the liquid outlet pipe is fixed with the measuring mechanism. The liquid specific heat capacity measuring device capable of realizing self-balanced pressurization and the measuring method, which are disclosed by the invention, have the advantages that to-be-measured liquid is always in a super-cooling region through a method of pressurizing the to-be-measured liquid by balance gas; the volume of the liquid storage tank is far greater than that of a measuring pool, so that the pressure of the liquid is hardly influenced by the heating expansion of liquid in the measuring pool; the measuring pool is always full of the to-be-measured liquid, so that the influence of bubble generation and liquid evaporation on the heat flow is avoided, the gas-liquid interface is always in the liquid storage tank far away from the measuring pool and the measuring accuracy is high; specific heat capacity experimental data of the whole heating region under the same pressure can be obtained through one heating experiment, so that the experimental time is shortened.

Description

technical field [0001] The invention relates to the technical field of liquid specific heat capacity measurement, in particular to a liquid specific heat capacity measurement device and method capable of self-balanced pressurization. Background technique [0002] Specific heat capacity, also known as specific heat capacity, referred to as specific heat, is the heat capacity of a unit mass substance, that is, the heat absorbed or released when a unit mass object changes a unit temperature. [0003] The specific heat capacity of a substance is related to the process being performed. There are three kinds of specific heat capacity at constant pressure Cp, specific heat capacity at constant volume Cv, and specific heat capacity at saturation that are commonly used in engineering applications. [0004] Specific heat capacity at constant pressure Cp: It is the energy absorbed or released by a unit mass of substance when the temperature rises or falls by 1°C or 1K under the condit...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 何一坚高能蒋云云陈光明温丰硕
Owner ZHEJIANG UNIV
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