Device and method for measuring heat storage coefficient of material by harmonic method based on independent sensor

Abstract

The invention discloses a device and method for measuring the heat storage coefficient of a material by a harmonic method based on an independent sensor, and relates to a testing technology of a heat storage material. The method comprises the following steps: placing samples to be measured in a sample storage tank, wherein, the independent sensor is vertically placed into liquid / powder when the liquid / powder sample is measured, and meanwhile the independent sensor is placed between the two identical samples to be measured to form a sandwich structure and then the sandwich structure is placed on the bottom surface of the sample storage tank in parallel when the solid samples are measured; electrically connecting the lead ends of the independent sensor with the lead rods of the sample storage tank; during a test, placing the sample storage tank on the bottom surface of an inner cavity of a constant-temperature and constant-pressure cavity, wherein, the relative positions of the samples to be measured and the independent sensor are well fixed in the sample storage tank; electrically connecting a harmonic measuring unit with the lead heads of the sample storage tank; and after the temperature and the pressure reach the set values, measuring the fundamental voltage and the third harmonic voltage on the two ends of the independent sensor, calculating the relationship between temperature rise and current frequency of the independent sensor, and finally calculating the heat storage coefficient value of the samples to be measured according to a harmonic measurement principle.

Description

technical field [0001] The invention relates to the technical field of heat storage coefficient testing of heat storage materials, and is a device and method for measuring the heat storage coefficient of materials based on an independent sensor based on a harmonic method, which is applied to heat storage materials such as porous solids, composite phase change materials, and nano powders. Thermal coefficient non-destructive testing. Background technique [0002] As a parameter to evaluate the heat transfer speed between materials and surrounding media, the heat storage coefficient has been paid much attention to its accurate measurement. Especially with the increase of new heat storage materials in various forms, the evaluation of the heat storage performance of these new materials is extremely useful for exploring their potential application fields. The 3ω technology based on harmonic detection developed in the past two decades has been considered as an effective means to m...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical defects of the existing 3ω measurement technology based on harmonic detection that need to repeatedly prepare planar metal sensors, insulation difficulties, and inability to accurately characterize liquid and powder samples when testing the thermal storage coefficient of materials. Therefore, the present invention provides A device and method for measuring heat storage coefficient of materials by harmonic method based on an independent sensor. The independent sensor can be reused to ensure the insulation between the planar metal sensor and the sample to be tested, and can be used for porous solids, composite phase change materials and nano powders Non-destructive testing of thermal storage coefficient of thermal storage materials

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