Device and method for measuring volume change rate of phase change power system

Abstract

The invention discloses a device and a method for measuring a volume change rate of a phase change power system. The device comprises a phase change power system, a phase change rehydration system anda variable temperature and variable pressure control system, wherein the phase change power system comprises an adiabatic top cover, heat conductive pipes, a phase change material, an adiabatic rehydration column, an adiabatic bottom cover and a first connecting tube; the phase change rehydration system comprises a laser displacement sensor, a rehydration tube adiabatic top cover, a rehydration tube, a reflector, a floating column and liquid; the variable temperature and variable pressure control system comprises a thermostatic water tank, a first cold-heat exchanger, a second cold-heat exchanger, a temperature sensor, a rehydration thermostatic water tank, a second connecting pipe, a pressure sensor and an air pump; By adopting the device, various constant phase-transition temperature conditions can be set through the cold-hot water exchangers; various pressure conditions of a phase change process can be set by the air pump, so that the measurement of the volume change rate of the phase change power system under different temperatures and pressures can be realized. The position of the floating column is measured by the laser displacement sensor, so that the acquisition of the liquid level change of the phase change material can be realized.

Description

technical field [0001] The invention belongs to the field of performance testing of a phase-change power system, and in particular relates to a device and a method for measuring the volume change rate of a phase-change power system under various temperature and pressure conditions. Background technique [0002] The phase change power system is a kind of power device that is filled with phase change materials inside and uses the principle that the phase change materials produce phase changes with temperature changes, and then produce volume changes to achieve work. The phase change dynamic system has been gradually applied to the fields of underwater submersible ocean temperature energy buoyancy drive device, spacecraft phase change micro-motion mechanism and so on. The volume change rate is an important index to measure the performance of the phase change power system. It reflects the work ability of the phase change material per unit volume of the heat pipe. It is not only ...

AI Technical Summary

Problems solved by technology

[0003] Existing methods for measuring the volume change rate of phase transition mainly include: measurement method based on Archimedes principle, observation method of discharging liquid, indirect measurement method of gas pressure, etc., the above-mentioned method has the following deficiencies, 1. does not consider the effect of ambient temperature on the displacement The influence of the volume value of the liquid and gas itself; 2. The influence of the pressure condition on the volume change rate of the phase transition is not considered; 3. The accuracy of the human eye observation method is low and cannot be collected and recorded in real time; 4. Most of the existing measuring devices are made of Simple test tubes and other equipment are temporarily overlapped and combined, which cannot achieve high-precision continuous data collection. 5. The existing measurement device has not considered the factor of the phase change heat transfer path, and it is impossible to measure the volume change rate of the radial phase change process of the heat pipe.

To sum up, the traditional volume change rate measurement device and method are relatively rough, the measurement results have errors, and the result accuracy is not high, and there is no device and method that can measure the volume of a phase change power system with high precision under various temperature and pressure conditions Continuous change process of rate of change

Images