Method for testing thermal conductivity of phase change materials

Abstract

The application provides a method for testing the thermal conductivity of a phase change material, comprising: placing a phase change material sample between a hot plate and a cold plate; adjusting the temperature of the cold plate to a first preset temperature, and the temperature of the hot plate Adjust to the initial temperature; for the hot plate, after reaching a steady state, collect the temperature and surface heat flow of the hot plate multiple times, average the temperature and the heat flow, and obtain the average temperature and heat flow ; adjust the temperature of the hot plate from the initial temperature to the termination temperature, and obtain the average temperature and the average heat flow every second preset temperature; according to multiple average temperatures and multiple The average value of the heat flow is used to obtain the thermal conductivity of the phase change material.

Description

technical field [0001] This application relates to the technical field of phase change materials, and specifically provides a method for testing the thermal conductivity of phase change materials. Background technique [0002] Phase change materials (Phase change materials, PCMs) refer to substances that change form (phase) with temperature changes and can absorb or release a large amount of latent heat. Their heat storage capacity in the phase change temperature range is much greater than the sensible heat of ordinary building materials. Heat storage capacity, and maintain a constant temperature during the phase change process. The performance of phase change components is affected by thermal properties, including: specific heat capacity, latent heat, and thermal conductivity. Thermal conductivity is an important factor affecting the heat absorption and release process of components containing phase change energy storage materials. [0003] The thermal conductivity at home...

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Problems solved by technology

The disadvantage of the steady-state method is that it is relatively primitive, the measurement time is long, and it has strict requirements on the environment; the disadvantage of the unsteady-state method is that the solution process is more complicated

[0004] The steady-state method and the unsteady-state method are suitable for isotropic and homogeneous materials, but the physical property parameters of phase change materials, such as the material with variable properties, the specific heat capacity and thermal conductivity change with the change of temperature, which is not a However, the existing test methods assume that the thermal conductivity and specific heat capacity are constant, which is contrary to the nature of the material itself.

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