Solid-liquid phase change material normal pressure thermal expansion rate and work volume digital measuring device

Abstract

The invention discloses a digital measuring device for a heat expansion rate and working quantity of solid-liquid phase transformation materials under normal pressure, which belongs to the physical measuring field. The invention comprises an inner container, an outer container, an air discharging lock, a pressure sensing device, a water level gauge, a water valve, a sampling control unit, a heat electric couple, and an automatic electric heater. The inner container is arranged crosswise inside the outer container, an emulsion film is arranged on one end of the inner container through a compression ring and an O-shaped rubber ring, the inner container is filled fully with measuring working fluid, the outer container is filled fully with water, the rubber ring is expanded out due to an expansion of the working fluid along water temperature rising inside the outer container, and water level inside the water gauge rises. The heat expansion rate and the working quantity of the solid-liquid phase transformation materials under normal pressure can be calculated out according to liquid levels as volume expansion signal, temperature and pressure signal, which provides a convenient and reliable approach for performance measurement of the solid-liquid phase transformation materials. The invention is applicable to materials as n-pentadecane, n-hexadecane, heptadecane, sodium acetate trihydrate, storing thermal paraffin RT 54 which is produced by a German company, and the similar materials.

Description

technical field [0001] The invention relates to a digital measuring device, in particular to a digital measuring device for the thermal expansion rate and work amount of a solid-liquid phase change material under normal pressure, and belongs to the technical field of physical measurement. Background technique [0002] The volume expansion rate and the amount of work done by solid-liquid phase change materials under temperature changes are important data for scientific research. Usually, the volume expansion rate of solid-liquid phase change materials under temperature changes is measured by manual reading and manual recording, which can neither guarantee the accuracy of the measurement, nor can it be connected to a computer for digital processing, let alone the measurement environment. Automatic control is used to improve the efficiency of measurement work, which makes it difficult to measure important performance data of phase change materials. In the existing technology, ...

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Problems solved by technology

Usually, the volume expansion rate of solid-liquid phase change materials under temperature changes is measured by manual reading and manual recording, which can neither guarantee the accuracy of the measurement, nor can it be connected to a computer for digital processing, let alone the measurement environment. Automatic control is used to improve the efficiency of measurement work, making it difficult to measure important performance data of phase change materials

In the existing technology, the application number is 02277190.5, and the name is "a device for measuring the shrinkage of concrete". Shrinkage rate, can not complete the measurement of the volume change of phase change materials at different temperatures, nor can it complete the measurement of the work effect caused by the volume change, and cannot provide digital information for the digital acquisition system

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