Novel test system for thermal stability of phase-change material

Abstract

The invention discloses a novel test system for thermal stability of a phase-change material. The test system comprises a cold and hot water circulating supply subsystem and a fast heating and fast cooling sample test are. The cold and hot water circulating supply subsystem comprises a cold water storage tank, a hot water storage tank and a heat pump circulating module. A compressor in the heat pump circulating module is connected to a water-cooled condenser; the water-cooled condenser is connected with an expansion valve; the expansion valve is connected to a water-cooled evaporator; the water-cooled evaporator is connected with the compressor; the water-cooled condenser is arranged in the hot water storage tank; and the water-cooled evaporator is arranged in the cold water storage tank. The invention has the beneficial effects of simple function, strong pertinence, and realization of tens of thousands of times of rapid heating / cooling phase-change circulation; the equipment has simple structure, low difficulty of installation and strong operationality, realizes automatic control and saves power; the design is simple and efficient, has good manufacturability, small space occupation and low cost; and the equipment does not contain mechanical moving parts, avoids frequent maintenance, and has long service life and very high application value in engineering.

Description

【Technical Field】 [0001] The invention relates to the field of material testing, in particular to a new type of phase change material thermal stability testing system. 【Background technique】 [0002] After a phase change material undergoes multiple phase change cycles, the stability of its thermophysical properties is an important indicator that determines the application field of the phase change material. The existing experimental instruments that can realize the functions of rapid cooling and rapid heating are mainly used to study the thermal physical parameters of the material after rapid cooling or rapid heating of the sample. Therefore, only one cooling or heating is performed, and the phase change material is not used for multiple rapid heating Rapid cooling phase change cycle and counting as the goal. In addition, the existing equipment has a complicated structure, is difficult to install, and is expensive, generally requiring about 30,000 to 50,000 yuan per unit. If it...

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Problems solved by technology

However, the above two improvement schemes have the following disadvantages: 1. Only the cyclic measurement of a single sample can be realized at a time, and the work efficiency is low; 3. All the materials are placed in the test tube, and the test tube is placed in a water bath. The heat transfer of the test tube and the heat transfer of the phase change material in the test tube are lower than those of the teaching

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