Experimental device capable of accurately measuring high-pressure volume change rate of phase change material

Abstract

The invention discloses an experimental device capable of accurately measuring the high-pressure volume change rate of a phase-change material. The experimental device comprises a phase-change material exhaust system, a phase-change heat exchange system, a displacement monitoring system, a pressure regulation and control system and a temperature control system. The phase-change material exhaust system comprises a vacuum pump and a vacuum tank; the phase-change heat exchange system is a part for containing a phase-change material to be tested; the displacement measuring system mainly comprises a piston rod and a laser displacement sensor; the pressure regulation and control system mainly comprises a pressure gauge, an overflow valve, a high-pressure oil cavity, a high-pressure oil pump and a high-pressure oil storage tank; the temperature control system mainly comprises a constant-temperature water tank, an electric heater, a compression refrigerator and a PID temperature controller. The high-pressure oil cavity and the overflow valve are used in cooperation to achieve stable pressure control, then the constant-pressure phase change process of the phase change material is achieved, meanwhile, measurement errors caused by the fact that the volume of high-pressure oil changes along with pressure are completely eliminated through measurement of the volume change rate, and finally accurate measurement of the volume change rate of the phase change material under different pressures is completed.

Description

technical field [0001] The invention relates to a heat storage and energy conversion system, in particular to an experimental device capable of accurately measuring the volume change rate of a phase change material under different pressures. Background technique [0002] With the massive consumption of fossil energy and the continuous increase of carbon emissions, renewable energy, including solar energy, wind energy, ocean temperature difference energy, and tidal energy, has received more and more attention. Renewable energy has the advantages of huge reserves, clean and pollution-free, and recyclable use. Therefore, the effective collection, conversion, storage, and utilization of new energy can not only reduce the dependence on traditional energy, but also achieve sustainable energy development. . A phase change material (PCM) refers to a substance that can change its state and absorb or provide latent heat under the condition of endothermic or exothermic. The process of...

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Problems solved by technology

[0006] The main purpose of the present invention is to solve the problems of large measurement errors and low precision of the high-pressure volume change rate measurement device, which can be used to solve the problem that the existing conventional experimental device for measuring the volume change rate of the material cannot perform high-pressure measurement, and provides a method that can be used Experimental device and method for measuring phase change volume change rate of high pressure phase change materials

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