Device for testing specific heat capacity of solution through heating by using approach method and testing method

Abstract

The invention discloses a device for testing the specific heat capacity of a solution through heating by using an approach method, and a testing method and belongs to the technical field of specific heat capacity testing. The device comprises an inner tube solution heating system, an outer tube automatic approach heating system, an outer tube vacuum thermal-insulating system and a data acquisitionsystem, wherein a solution is continuously heated through a built-in heating rod; a magnetic heating stirrer is powered on; and an inner tube solution is stirred by using a magnetic stirrer, and thena uniform temperature field is formed inside an inner tube. On and off of an outer tube heating circuit is controlled by a relay, then the temperature of an outer tube approaches to the temperature of the solution constantly, and heat exchange of the solution with the environment in a heat conduction manner is prevented. Meanwhile together with measures such as vacuuming and heat-preservation layers, heat of the solution is not radiated to the environment, and the heat of the heating rod can be completely adopted to heat the inner tube solution heating system. By virtue of an equation Q=Pt=cmdetalT, the specific heat capacity of the solution is tested, and in the equation, P is the heating power of a heating body and is directly tested by using a power meter. The device is simple in structure, convenient to operate, capable of automatically controlling the temperature of the outer tube, and high in control precision together with a PID (Proportion Integration Differentiation) algorithm.

Description

technical field [0001] The invention relates to the technical field of specific heat capacity measurement, in particular to a device and a test method for measuring the specific heat capacity of a solution by using an approximation method to raise the temperature. Background technique [0002] The specific heat capacity represents the ability of a substance per unit mass to absorb or release heat when the temperature increases by 1K without phase transition, and is an important physical property parameter for studying the thermal properties of materials. There are many methods for measuring specific heat capacity, but there are certain problems such as heat dissipation and uneven stirring. [0003] The mixing method is a method of mixing a substance with a known heat capacity and a substance to be measured. This method is mostly used for measuring the specific heat capacity of a solid, and is not suitable for measuring the specific heat capacity of a solution. [0004] The ...

AI Technical Summary

Problems solved by technology

For example, the traditional adiabatic calorimetry method for measuring specific heat capacity is complex in operation, long in measurement cycle and large in sample volume.

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