Abstract
The thermophysical properties of phase change material include thermal conductivity, heat of absorption, and phase change temperature range. This paper investigates the measurement methods of thermophysical properties for phase change material inside a full-scale container. The influence of contact thermal resistance is considered in a thermal conductivity test, and the formula for calculating the thermal conductivity of a phase change material inside the full-scale container is derived. In addition, the heat of absorption is measured based on the calibration results of the correction coefficient for heat flux sensors. In order to verify the reliability of the measurement method, the thermophysical properties of docosane and erythritol inside a full-scale specimen are measured, and the results are compared with HotDisk analyzer results and published data. The comparison results reveal that the method proposed in this paper can accurately measure the thermophysical properties of phase change material inside a full-scale specimen.
Highlights
With the development of science and technology, energy storage technology has been widely used in many practical applications [1,2,3,4,5]
This paper presents a measurement of thermal conductivity for a solid phase change material (PCM) in a container using the heat flow method analysis (HFMA) method with contact thermal resistance compensation; it presents the phase change temperature range and heat of absorption measurements for a PCM in a container using the dynamic heat flow meter analysis (DHFMA) method
In order to verify the measurement result of the heat of absorption, the latent heat of n-docosane was calculated to the measurement result of the heat of absorption, the latent heat of n-docosane was calculated to compare with the differential scanning calorimetry (DSC) results
Summary
With the development of science and technology, energy storage technology has been widely used in many practical applications [1,2,3,4,5]. In order to optimize the design of energy storage systems, it is important to accurately measure the thermophysical properties of a phase change material (PCM). Used in an energy storage system, including the thermal conductivity, the heat of absorption, and the temperature range of the phase change. For the measurement of thermal conductivity for a solid PCM, the hot wire method [6,7,8], the HotDisk method [9,10,11], and the steady state method [12,13,14] are widely used. The steady state method, including the heat flow method analysis (HFMA) method, is generally used to measure the thermal conductivity of a full-scale product. The steady state method is susceptible to the influence of contact thermal resistance [15].
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