Thermal Conductivity of Molten Carbonates with Dispersed Solid Oxide from Differential Scanning Calorimetry

Abstract

Recently, there has been a noticeable increase in the applications of composite mixtures containing molten salt and solid oxide for thermal energy conversion and storage systems. This highlights that thermal conductivity of the composites are central for the purpose of designing and devising processes. Measuring the thermal conductivity of molten samples at elevated temperatures remains challenging. In this study, the possibility to use heat flux differential scanning calorimetry (DSC) to measure the thermal conductivity of molten samples at elevated temperatures is reported for the first time. The thermal conductivity of composite mixtures containing eutectic (Li,Na)2CO3 with and without selected solid oxides at ~675 °C was determined by using the proposed DSC approach. This mixture is a candidate for high temperature waste heat conversion to electric energy. In the DSC measurement program, steps with repeated thermal cycles between 410 and 515 °C were included to limit the effect of the interface thermal contact resistance. The determined values 0.826 ± 0.001, and 0.077 ± 0.004 W m−1K−1 for the carbonate mixtures with and without solid MgO were found to match the reliable analysis at similar conditions.

Measurement of effective thermal conductivity of composite powders of 2D materials and metals for additive manufacturing

“…During the melting of the indium disc the thermal resistance of Equation ( 2) can be obtained from the slope of the DSC heat flow, as shown in Fig. 2a [13]. By running separate experiments with and without a powder bed in the crucible (see Fig.…”

Comparative analysis of the energy content of diverse fuels performed via thermogravimetric investigations

“…Figure 2. The scheme of Netzsch STA 449 C Jupiter device, used for analysing TG and DSC, consisting of: 1-Gas outlet, 2-Heating element, 3-Sample carrier, 4-Radiation shield, 5-Vacuum-tight housing[24],[25] …”