Solid-liquid phase change material melting heat transfer performance parameter testing system and method thereof

Abstract

The invention discloses a solid-liquid phase change material melting heat transfer performance parameter testing system and a method thereof. The system comprises a phase change material container, a liquid phase material expansion port, an expansion tube provided with a liquid level sensor, a heat insulation sleeve, an analog-to-digital converter and a computer; a solid-liquid phase change material is contained in the cavity of the phase change material container, the top of the symmetrical center of the phase change material container is provided with the liquid phase material expansion port, the liquid phase material expansion port is connected with the expansion tube provided with the liquid level sensor, the expansion tube provided with the liquid level sensor is wrapped by the heat insulation sleeve, a liquid level simulation signal of the liquid level sensor is transmitted into the analog-to-digital converter in real time, and a data signal derived by the analog-to-digital converter is transmitted to the computer. Automatic measurement, operation and display of the melting rate, the integral heat exchange coefficient and other key heat transfer performance parameters of a phase change material in an internal non-visual container can be realized within a certain precision range through reasonable hypothesis and strict derivation based on volume expansion data in the solid-liquid phase change melting process.

Description

technical field [0001] The invention relates to a testing system and method for the melting and heat transfer performance parameters of solid-liquid phase change materials. Background technique [0002] Engineering and experimental backgrounds such as heat storage units in stacked bed heat storage heat exchangers, solar heat storage tanks, liquid-phase non-transparent nanocomposite phase change materials in laboratories with melting tests in containers of different shapes, etc. Under the current conditions, the specific conditions of the phase change material in the container during the melting process cannot be directly observed. The existing method calculates key heat transfer performance parameters such as melting rate and overall heat transfer coefficient through the contour of the solid-liquid phase interface during the melting process. Cannot be applied when the interior is not visible, see references: E. Assis, L. Katsman, G. Ziskind, R. Letan, Numerical and experimen...

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Problems solved by technology

[0002] Engineering and experimental backgrounds such as heat storage units in stacked bed heat storage heat exchangers, solar heat storage tanks, liquid-phase non-transparent nanocomposite phase change materials in laboratories with melting tests in containers of different shapes, etc. Under the current conditions, the specific conditions of the phase change material in the container during the melting process cannot be directly observed. The existing method calculates key heat transfer performance parameters such as melting rate and overall heat transfer coefficient through the contour of the solid-liquid phase interface during the melting process. Cannot be applied when the interior is not visible, see references: E. Assis, L. Katsman, G. Ziskind, R. Letan, Numerical and experimental study of melting in a spherical shell, International Journal of Heat and Mass Transfer 50 (2007)1790–1804

The relevant results can only be predicted by numerical simulation, and there is a lack of effective experimental measurement methods

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