Selection of thermal conductivity measurement method

In the chemical industry and construction industry, many scientific research, production and application processes involve heat transfer. Thermal conductivity (or thermal conductivity) is often used to measure the thermal conductivity and thermal insulation performance of materials, and is an important parameter of materials. Thermal conductivity (λ) refers to a 1m thick material with stable heat transfer conditions. The temperature difference between the two surfaces is 1K (or ℃). Within 1h, the heat transferred through 1m2 area, the unit is W / (mK), K here can be replaced by ° C. The smaller the λ value, the better the thermal insulation performance of the material. Because the size of the thermal conductivity depends on many factors such as the structure of the measured object, average temperature, water content, heat transfer time, temperature difference between the two sides, etc., it is generally determined by experiment. There are many methods for measuring the thermal conductivity of materials. They have different application fields, measuring ranges, accuracy, accuracy, and sample size requirements. The results of different methods on the same sample may be quite different. Therefore, choosing the appropriate test method is the first priority.

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