A method for measuring the phase transition function of a shaped phase change material

Abstract

The invention discloses a method for measuring the phase change function of a fixed-shape phase-change material. Firstly, a standard substance is put into a metal tube with heat insulation at both ends. First, second and third thermocouples are arranged inside the metal tube, and the inner and outer walls of the metal tube are The fourth and fifth thermocouples are installed on the top respectively, and the temperature data of the first to fifth thermocouples are collected at room temperature and during the temperature rise process, and the thermal conductivity coefficient of the metal tube wall is calculated, and then a fixed phase change material is placed in the metal tube, Collect the temperature data of the first to fifth thermocouples in the process of room temperature and temperature rise and fall, calculate the thermal conductivity of the shape-setting phase change material, and then derive the specific heat before the phase change, the specific heat after the phase change and the latent heat of the phase change of the shape-setting phase change material . The invention can obtain the thermal physical property parameters of the fixed phase change material only by performing one measurement of the heating and cooling process. The invention has a large sampling amount, and can avoid measurement errors caused by a small sampling amount. Moreover, the data processing method of the present invention can reduce the difficulty of data processing and improve the accuracy of data processing.

Description

technical field [0001] The invention belongs to the field of measuring methods for thermal physical property parameters, and in particular relates to a measuring method for a phase change function of a shape-fixed phase change material. Background technique [0002] Since the energy crisis, basic and applied research on phase change energy storage has become a hot topic. Phase change materials can not only store energy, but also reduce temperature fluctuations and play a role in shifting peaks and filling valleys. However, traditional solid-liquid phase change materials have to consider sealing problems and low heat transfer efficiency in use. Shape-fixed phase-change materials have broad application prospects because of their excellent properties such as maintaining the same shape when the working substance undergoes a phase transition, no leakage, and the carrier matrix can improve thermal conductivity. [0003] Thermophysical parameters such as phase transition point, he...

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Problems solved by technology

The mathematical theory is abstract and the processing process is complicated. Since it was proposed in 2009, no other researchers have conducted repeated or similar experiments.

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