Device and method for testing one-dimensional heat exchange phase change process of waxy phase change material

Abstract

The invention discloses a device and a method for testing the one-dimensional heat exchange phase change process of a waxy phase change material. The device comprises a hydraulic system, an upper water pool, a lower water pool and a sealing tank. The hydraulic system comprises an oil tank, a liquid level sensor, a hydraulic pump, a driving motor, a one-way valve, a pressure regulating valve, a stop hand valve, a pressure sensor and a rubber bag; the upper water pool comprises an upper water tank, an upper cold-heat exchanger and an upper temperature sensor; the lower water pool comprises a lower water tank, a lower cold-heat exchanger and a lower temperature sensor; the sealing tank comprises a heat conduction upper cover, a heat conduction lower cover, a ceramic tube wall, bolts, a fluidinlet one-way valve, a fluid outlet one-way valve, a fluid inlet plug and a fluid outlet plug. The device has the advantages that one-dimensional heat exchange phase change process testing and material performance evaluation of the phase change material, the phase change material and the enhanced heat conduction nano-powder mixture can be carried out under various temperature and pressure conditions, measurement is accurate, continuous collection is achieved, the automation degree is high and universality is high.

Description

technical field [0001] The invention belongs to the technical field of phase change drive, and in particular relates to a test device and method for a one-dimensional heat exchange phase change process of a waxy phase change material. Background technique [0002] Phase-change driving is a driving method that utilizes the volume change of materials during the solid-liquid phase transition to achieve external work. Among them, phase-change materials are the key to realizing phase-change driving, and phase-change materials absorb near the phase-change temperature point. The solid phase is transformed into the liquid phase and the volume expansion is achieved after sufficient heat, or the liquid phase is transformed into the solid phase and the volume is reduced after the release of sufficient heat. Phase-change drive does not require additional power supply or control unit, and can complete the drive process only by relying on changes in ambient temperature, which saves electr...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing phase change material testing devices use methods such as the Archimedes principle measurement method, the liquid discharge observation method, and the gas pressure indirect measurement method. The above methods still have many deficiencies. The influence of volume change rate and thermal conductivity; 2. The accuracy of human eye observation and recording data is low and cannot be recorded continuously in real time; 3. There are many thermal interference factors, and phase change materials cannot realize the ideal one-dimensional heat exchange phase change process, which affects test accuracy

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